Nuryono Nuryono

Universitas Gadjah Mada | UGM · Department of Chemistry

Due to inadequate drug tissue penetration and low blood supply to the bone, the systemic delivery of medications during infection and inflammation of bone tissues frequently fails to heal abnormalities or lesions in bone tissues. In the quest for local delivery of antibiotics to treat the infection and bone-grafting particles to stimulate bone grow...

Glycidyl-trimethylammonium chloride (GTMAC) containing quaternary ammonium (QA) groups is commonly used as a base catalyst for any organic reaction. This research prepared a novel composite of GTMAC attached to chitosan-coated magnetic material (MM/Chi/GTMAC) using a precipitation method. The effect of chitosan and GTMAC contents on MM/chi/GTMAC pr...

To promote more widespread use of biodiesel, it is essential to add additives to improve its fuel properties, and one such additive is ethyl levulinate (EL). EL is often produced by acid-catalyzed esterification of levulinic acid (LA) with ethanol, but acid catalysis has a critical problem of low catalytic activity. This problem can be solved by us...

SiO2-TiO2@propylamine-Ni(II) as the catalyst for the benzyl alcohol oxidation has been synthesized by utilizing rice husk ash as the SiO2 source. This research was started by extracting SiO2 from rice husk ash and continued by synthesizing the SiO2-TiO2 composite using titanium(IV) tetraisopropoxide (TTIP) as TiO2 precursor and PEG-40 as template....

Background: Most of dental implants are accompanied by guided bone regeneration (GBR) procedures. Collagen membrane which is the most widely used type of membrane in the GBR procedure has the disadvantage of not having antimicrobial properties, old bone formation, easy to tear, and soft so that it does not maintain the dimensions of the augmentatio...

Sampah menjadi masalah serius di daerah perkotaan. Hal ini disebabkan oleh adanya kepadatan penduduk yang tinggi. Penimbunan sampah terus menerus akan menghasilkan pencemaran pada air lindi, baik yang berupa senyawa organik maupun anorganik termasuk logam berat. Pada penelitian ini dievaluasi penyebaran logam berat timbal (Pb) dan cadmium (Cd) dala...

The physical and antibacterial properties of mineral trioxide aggregate (MTA) have been improved by adding copper nanoparticles (CuNP). The CuNP colloid was synthesized by reacting CuCl2·2H2O and NaBH4 as the reducing agent using C6H8O6 as the capping agent. The Cu(II) concentration was varied by 3.0, 6.0, and 9.0 mM to produce CuNP-3, CuNP-6, and...

Synthetic dental fiber tape for fiber reinforcement (FRC) restoration is relatively costly and its availability is still limited in Indonesia, so natural dental fibers have been used as an alternative material. The aim of this study was to assess the effect of impregnation of various fiber tape toward the flexural strength and hardness of FRC. The...

Biphasic calcium phosphate substituted cerium (BCP/Ce) is a potential material for osteoporotic bone filler. Synthesis of BCP/Ce was conducted by the sol-gel method. This work aimed to study the influence of cerium as a precursor on the crystal structures, surface properties, and agglomeration of BCP/Ce. A series of samples were prepared by various...

Natural magnetic particles/chitosan/CuNPs (NMP/Chi/CuNPs) have been successfully synthesized in green chemistry by impregnation of copper nanoparticles (CuNPs) on the composite of natural magnetic particles/chitosan (NMP/Chi). Copper nanoparticles were prepared using Cu(II) solutions with varying concentrations (5, 10, 15, 20, and 25 mM). The synth...

This research synthesized natural magnetic particles/chitosan/gold nanoparticles composites (NMP/Chi/AuNPs) using a green method. AuNPs were synthesized using chitosan as a reducing agent and stabilizer in one step. The obtained AuNPs were characterized using UV-Vis spectrophotometer and TEM. Results showed that AuNPs were spherical with an average...

Limestone collected from Gunung Kidul Regency (Special Region of Yogyakarta, Indonesia) has been used to synthesize precipitated calcium carbonate (PCC) without calcination step. This paper evaluates the effect of calcination of limestone, HNO3 concentration of dissolution, and reaction time of carbonation on the PCC properties. The PCC was synthes...

In this research, the effect of strontium oxide (SrO) and hydroxyapatite (HA) on the properties of mineral trioxide aggregate (MTA) have been studied. MTA contained 20% SiO2, 60% CaO, and 2% Al2O3. Bi2O3 and SrO have been added with 18% (w/w) total percentage. MTA was prepared with a sol-gel process using a weak base (NH3) as a catalyst and calcine...

p>The preparation of white mineral trioxide aggregate (WMTA) was carried out using a solid technique using silica (SiO2) from rice husk ash (RHA). The process included extraction of SiO₂ from RHA, the effect of SiO₂ composition on material characterization and material compressive strength. Silica was extracted from RHA using...

Several attempts have been conducted to improve the mechanical properties of mineral trioxide aggregate (MTA), including the addition of various nanoparticle materials such as silver and titania. The smaller the added material, the higher the material’s ability to fill the cavity of MTA, thus increasing the tensile strength of MTA after hydration....

White mineral trioxide aggregate (WMTA) was successfully synthesized using silica from rice husk ash (RHA) and precipitate calcium carbonate (PCC) from limestone. Silica was synthesized from rice husk ash by the sol-gel method with the help of a strong base NaOH to obtain sodium silicate solution. In contrast, PCC in the calcite structure was extra...

Removal of Au(III) on a purified bagasse ash (BA) has been examined. The purified BA adsorbent was prepared through purification of a crude BA obtained from Madukismo sugarcane industry, Yogyakarta, Indonesia, using a mixed solution of HCl 0.1 M and HF 0.3 M and followed by HNO3 3 M. The HCl-HF-HNO3 purified BA contained quartz with silanol (Si-OH)...

As one of the essential additives in biodiesel and flavoring agents, solvents, and plasticizers in industry, ethyl levulinate (EL) has gained attention in the last two decades, and the global production of the compound is rapidly increased over the years. So far, esterification of biomass-derived levulinic acid (LA) with ethanol (EtOH) in the prese...

The main objective of this study was to evaluate the effect of soda ash (SA) and carboxy methyl cellulose (CMC) on the rheological of white bentonite collected from Boyolali, Indonesia (BWB). The first work was the determination of BWB composition with XRF and the study on the effect of SA on the swelling index. The second step was to study adding...

Post bleaching procedures often have free radicals trapped in dentin tubule and interprismatic enamel, leading to demineralization and denaturation. Sodium ascorbate is an antioxidant substance known to bind residual free radicals to stop demineralization and denaturation. The purpose of the study was to assess the calcium and phosphorus loss from...

In this research, silver nanoparticles (AgNP) impregnated on natural magnetic material/chitosan composite (NMP/Chi) have been conducted with different AgNP concentrations (0.5, 1.0, 1.5 mM). Their antibacterial activity was examined against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The AgNP samples were characterized with UV...

Owing to their favorable physical, chemical and optical properties, gold nanoparticles (AuNPs) are one of the most intensively studied and applied nanoparticles (NPs) in the modern era. However, the application of bare AuNPs is subject to aggregation and agglomeration, which reduce their function and performance. Solid support, which may be used as...

A study of the adsorption kinetics of Au(III) ions has been carried out by an adsorbent of silica-chitosan coated magnetic material (BMSK). The BMSK adsorbent was synthesized through a sol-gel process using magnetic materials from iron sand, sodium silicate, and chitosan with 3-chloropropyltrimethoxysilane linker. The adsorption kinetics was studie...

Magnetic adsorbents are composed of magnetic materials for magnetic separation and functional molecules for adsorption of substances. Depending on the properties of the functional molecules used, it is possible to adsorb various pollutants such as harmful organic compounds, heavy metals, and radioactive substances. The selectivity, rate, conditions...

Membranes for GTR (Guided Tissue Regeneration) are a promising method for treating periodontitis cases. The manufacture of membranes for GTR based on chitosan, gelatin, and carbonated hydroxyapatite (CHA) by crosslinker tetraethyl orthosilicate (TEOS) and (3-aminopropyl)triethoxysilane (APTES) using the freeze-drying method has been successfully ca...

Efficient gold-modified-Fe3O4/SiO2/TiO2 photocatalysts have been synthesized and employed for nitrobenzene degradation under UV-visible illumination. The results revealed that the prepared Fe3O4/SiO2/TiO2-Au photocatalysts displayed magnetic properties. In addition, the modification of Au reduced the energy of the band gap of the photocatalyst, inc...

Membrane for guided tissue regeneration (GTR) is an interesting method for treating periodontitis cases. Synthesis of membranes for GTR based on gelatin and carbonated hydroxyapatite (CHA) modified by chitosan using the freezedrying method has been successfully carried out. This study aims to obtain the optimum composition between gelatin and chito...

Silica functionalized with sulfonic acid catalyst (SiO2−SO3H) was synthesized through a one-pot method and evaluated as the catalyst material for esterification of levulinic acid in an excess amount of ethanol. Sodium silicate solution was used as the silica source, and then a silane coupling agent, namely GPTMS, was used to incorporate the sulfoni...

Iron(III)-doped SiO2/TiO2 composite (SiO2/TiO2-Fe) has been prepared from sugarcane bagasse ash for photocatalytic degradation of Congo Red. This research was initiated by preparing SiO2 from sugarcane bagasse ash through a sol-gel method. The SiO2/TiO2-Fe was obtained by mixing SiO2 gel with TiO2-Fe sol which was produced with titanium tetraisopro...

Water contamination by oil spills causes severe damage to the environment and human health. Oil adsorbents should be buoyant, for effective oil-contact, and regenerable. In this study, diatomaceous-earth (DE)-incorporated magnetic alginate (Alg)-based beads, chemically modified to include phthalic or maleic anhydride (denoted as Alg/DE/Fe3O4-PA and...

The contamination of sulfate ions leading to corrosion is a severe problem in the aquatic environment, and adsorption is an effective method to remove this contaminant. In this study, magnetic silica-chitosan hybrids (MP@SiO2/CPTMS/Chi) prepared by the sol-gel method have been used for adsorbing sulfate ions from an aqueous solution. The maximum ad...

The composition of water and powder in a mixture is one of the common problems in application as clinicians typically estimate the ratio chairside. The purpose of this study was to investigate the effect of varying water-to-powder ratios on the microhardness and microstructure of mineral trioxide aggregate (MTA). ROOTDENT MTA was investigated. One...

The recovery of Au(III) in the Au/Cu/Mg system from mercapto-silica hybrid coated magnetite (SH/Fe3O4@SiO2) adsorbent has been investigated. This adsorbent characterized using FT-IR to determine functional groups, crystallinity study using XRD, surface morphology using SEM, material compositions with XPS, surface area using nitrogen adsorption, and...

This study reports the preparation of white mineral trioxide aggregate (WMTA) using precipitate calcium carbonate (PCC) by sol-gel method at various thermal treatments 900, 1100, and 1300 °C. The composition of WMTA included PCC (55% CaO), C 6 H 16 O 3 Si-TEOS (21% SiO 2 ), Al(NO 3 ) 3 ⋅9H 2 O (2% Al 2 O 3 ), and Bi 2 O 3 . WMTA 1100 with the highe...

In this study, adsorption as an environmental friendly technique has been applied for separation and recovery of gold (Au) from gold mining rock sample with iron sand magnetic material coated with silica/chitosan (MMSC). The works included preparation and characterization of adsorbent; gold leaching from the rock sample, and adsorption-desorption o...

White Mineral Trioxide Aggregate (WMTA) using a combination of precursors consisting entirely of SiO 2 , CaCO 3 , Al 2 O 3 , and Bi 2 O 3 which are widely used as cement for tooth restoration has been prepared. SiO 2 was extracted from rice husk ash containing about 85-95% of silica found in rice husk ash from complete combustion. On the other hand...

This research aimed to study SiO2/quaternary-chitosan-coated magnetic material synthesis using the sol-gel method through two synthetic routes. The step of Route 1 was the methylation of the amine group on chitosan using methyl iodide and sodium hydroxide with dimethylformamide : water (1:1) as a solvent at room temperature for 48 hours to produce...

Hydroxyapatite (HA) has been deposited on silica (SiO2) particles to produce HA-SiO2 composite that will be used as the powder component of calcium phosphate cement. HA was expected to be on the composite surface to maintain its bioactivity. SiO2 was made by the sol-gel method, in which silicate solution was extracted from rice husk ash with NaOH s...

Oil spills are a worldwide concern because of their negative impact on the environment. Thus, the development of simple yet effective methods for oil pollution remediation remains a significant global challenge. Of remediation techniques for oil removal, those involving adsorption are superior, but most reported adsorbents sink in water and are, co...

Iron sand is an abundant source of magnetic material found in the coast of Indonesia. Extraction of magnetic material from iron sand was carried out using NaOH to produce a greener ultrasonic process. The optimum conditions for treatment of iron sand were obtained at 20 minutes, NaOH 4 M and at 60 °C with content of Fe²O³ of 77.19% and SiO2 of 6.49...

A study to improve the performance of andesite mortar and rock consolidated with tetraethylorthosilicate (TEOS) sol and a solvent of ethanol in the presence of titanium tetraisopropoxyde (TTIP) and silica particles has been conducted. The improvements include minimizing the shrinkage using silica particles from rice husk ash, rheological property s...

In the present study, we tested nine commercially available activated carbons for their abilities to recover phosphate ion from an aqueous solution by a temperature swing method, in which phosphate ion was adsorbed at 303 K, followed by desorption and recovery in pure water at 373 K. While the activated carbon made from coconut shell and manufactur...

It is keenly desired to develop an environmentally benign and highly stable magnetic adsorbent for efficient recovery of Au(III) ion from an acidic solution. In the present study, we investigated the synthesis of magnetic adsorbents that the magnetic particles, which was prepared from natural iron sand, were modified with silica layer on which chit...

Diethylenetriamine-functionalized silica coated on magnetic material of iron sand ([email protected]2−DETA) has been synthesized through sol-gel technique for adsorption of Au(III) in aqueous solution. Synthesis was carried out by coating magnetic material of iron sand as the core with diethylenetriamine-modified silica using sodium silicate soluti...

Coating of mercapto modified silica on iron sand magnetic material for Au(III) adsorption in aqueous solution Martasiana Karbeka1* , Nuryono2 , Suyanta2 1Department of Chemisty, Universitas Tribuana Kalabahi, Alor, 85812 Indonesia 2Department of Chemistry, Universitas Gadjah Mada, Yogyakarta, 55284 Indonesia E-mail: martasianakarbeka@untribkalaba...

The proportion of MTA powder and water is a common factor impacted on the properties of the material in clinical application. The purpose of this research was to determine the compressive strength and porosity of Mineral Trioxide Aggregate (MTA) mixed with varying water-to-powder (WP) ratios. ROOTDENT MTA was investigated. One gram of cement was mi...

White Mineral Trioxide Aggregate (WMTA) using precipitated CaCO 3 (PCC) from limestone has been synthesized. PCC in calcite structure was extracted from limestone by calcination at 900 °C for 3 h, dissolved in 0.8 M nitric acid solution and followed with carbonation for 60 minutes. PCC was used for the synthesis of WMTA by mixing with tetraethoxyor...

The synthesis of gold nanoparticles (AuNPs) was carried out by reacting chloroauric acid [AuCl 4 ] ‒ and glutamic acid solution in a water bath at 80 °C. The reaction was confirmed by the color change from colorless solution into pink. Various concentrations of the glutamic acid solution, reaction times and pH were examined to determine the optimum...

In this research, we report the use of free sodium and less Fe ion silica (SiO 2 ) for preparation of White Mineral Trioxide Aggregate (WMTA). SiO 2 was extracted from rice husk ash (RHA) using NaOH 2 M and HCl 37% (v/v) and removal of Na was performed by washing the extracted SiO 2 using deionized water with various volumes and techniques. Before...

Selective adsorption of Au(III) in multimetal systems Au ³⁺ /Cu ²⁺ /Ni ²⁺ on Amino-Silica Hybrid coated Magnetite (ASHM) has been studied. ASHM was synthesized via a sol-gel process using magnetite that was obtained through coprecipitation of Fe ²⁺ /Fe ³⁺ salts mixture with NH 4 OH as precipitating solution, sodium silicate solution of rice husk as...

This work aim to study sorption-desorption of Au(III) onto silica modified quaternary amines (SMQA) in gold mining effluent. Synthesis SMQA was conducted by methylation silica modified ammine (SMA) that synthesized by sol-gel process of silica gel (SG) from rice hull ash and APTMS. Characterizations this material by FT-IR, XRD, SEM-EDS and GSA anal...

Synthesis of silica coated on iron sand magnetic materials modified with mercapto was carried out through a sol-gel method. This study aims to obtain adsorbent material that has magnetic properties. The purpose of this research are gift magnetic proprties of adsorbent. It was easy access to the separation of the adsorbent after the adsorption proce...

The corrosion inhibition on the iron surfaces by (2R)-5-hydroxy-7-methoxy-2-phenyl-2,3-dihydrochromen-4-one (PN), isolated from Kaempferia pandurata Roxb, has been conducted both experimentally and theoretically. The corrosion inhibition effectiveness of PN was studied by gravimetric and electrochemical experiments and density function calculation...

The efficiency of ethyl-p-methoxycinnamate(EPE) and its derivatives as corrosion inhibitors of iron in acid environment has been studied to find the relationship between molecular structure and electronic parameters with their efficiency of corrosion inhibition. The ab initio MP2 perturbation theory and DFT method were applied to calculate molecula...

This study focuses on the synthesis and application of a Fe3O4/SiO2/TiO2 nanocomposite as a photocatalyst in CO2 indirect reduction. The synthesis was started by preparation of magnetite (Fe3O4) followed by silica (SiO2) coating and titania (TiO2) deposition. Magnetite was prepared by the sono-coprecipitation method, then the coating of SiO2 and de...

One of the basic ingredients of making White Mineral Trioxide Aggregate (MTA) was silica. The sources of silica was from white rice husk ash (RHA) and silica extracted from RHA. Silica could be extracted from natural ingredients in the form of rice husk ash. The purpose of this study were to extract silica from rice husk ash and purify the silica e...

This research work presents the design of a mixture of SiO 2 /TiO 2 that increases the surface roughness and hydrophobicity of methyltrimethoxysilane (MTMS) coated glass. The deposition of SiO 2 , TiO 2 , and MTMS were conducted using a layer by layer dip coating technique. The SiO 2 /TiO 2 coating was derived from complete hydrolysis of tetraethyl...

Theoretical studies on the performance of corrosion inhibition of dibenzo-18-crown-6 compounds and its derivatives have been carried out using the B3LYP/631G(d) theory level. The effect of electron donor groups (NH 2 , OCH 3 , OH, CH 3 , CHCH 2 ) and electron withdrawing groups (COOCH 3 , COOH, CHO, F, NO 2 ) was also studied in the gas and aqueous...

This study was conducted to investigate the occurrence of aflatoxin M1 (AFM1) in various milk products marketed in Yogyakarta Province (Indonesia) and to estimate the exposure of afla-toxin through contaminated milk consumption. Fresh milk (n=20), pasteurized milk (n=16), and recombined milk products (n=6) were sampled for AFM1 concentration testin...

Anthocyanins are one of the major dyes in plants. They have an aromatic and heteroatom within their framework structure so that anthocyanins are likely to be bound to metal surfaces via heteroatoms or π-π interactions. This property leads to the potential application of anthocyanins as corrosion inhibitors. However, there are challenges in determin...

The corrosion inhibition efficiency of dibenzo-diaza-15-crown-5 (N) and its heterocyclic analogs containing O, S, and P atoms were investigated by ab initio MP2 calculations in aqueous phase. Heteroatoms have a significant role in the corrosion inhibition performance of the studied systems. The geometry parameter shows that the decrease of bond len...

The use of synthetic lithium silicates from lithium hydroxide and silica as consolidated in bricks through mortar testing has been studied. Lithium silicate is was synthesized through sol gel at 70 oC using lithium hydroxide (LiOH) and fumed silica (SiO2) as raw materials with a mol ratio of 4:1. Consolidation was done by mixing the brick powder...

A hydrophobic coating for glass substrates was developed using Si 2 , TiO 2 , and methyltrimethoxysilane (MTMS) to achieve low surface energy and a rough surface. The coating process was conducted using a sol-gel method and layer by layer deposition. The effect of Si 2 , Ti 2 , and MTMS on the hydrophobicity and transparency of the coating were eva...

As the Printed Circuit Board (PCB) contains high number of metals, e.g., Au, Cu, Ni, etc., the separation and recovery of Au as one of precious metals have become very interesting in science, environmental and economic purpose. In this study, adsorption as eco-friendly chemical method has been applied for separation and recovery of gold from PCB wi...

Alginate is a polysaccharide extracted from cell walls and intracellular matrix of brown seaweed, and has been widely used for industrial purpose due to gelling capabilities in the presence of divalent cations. However, the characteristics of alginate extracted are depend on alginate gel strength and viscosity. The objective of this research was to...

This research was conducted to study the effects of zeolite in reducing aflatoxin residues and liver histopathology of laying duck. Sixty-four of Indonesian local laying duck (Anas platyrinchos Borneo) were randomly allocated to 2 levels of aflatoxin B1 (AFB1) (low: 30 ppb; and high: 70 ppb) and 2 levels of zeolite inclusions (0 and 2%). The trial...

Modifications of propylsulfonic acid-fixed Fe3O4@SiO2 with three organosilanes (C2, C8, and phenyl) were investigated to develop a magnetically separable solid acid catalyst active for hydrolysis of ethyl acetate in excess water. Among the organosilanes, triethoxy(octyl)silane was the best modifier for improvement in catalytic activity, with activi...

The study aimed to isolate, characterize and measure the corrosion inhibition efficiency of (E)-ethyl 3-(4-methoxyphenyl)acrylate (EPE) from Kaempferia galanga extract of iron in 1 M HCl solution. The experimental study was conducted with weight loss and electrochemical impedance measurements followed by theoretical study using density functional t...

In this research magnetite was synthesized by coprecipitation method, in which solution of NH4OH was added into the solution containing a mixture of Fe2+/Fe3+ (molar ratio 1:2) until pH 11 under strong ultrasonic agitation for 30 min. The black sediment of magnetite was filtered, washed and dried. The product was then modified by using oleic acid t...

In this study water repellent layered glass has been prepared by coating silica (SiO2) combined with a hydrophobic silane compound. SiO2 was extracted from rice hull ash and two silane compounds, namely hexadecyltrimethoxysilane (HDTMS) and trimethylchlorosilane (TMCS) were used. Coating was performed through two deposition techniques, i.e. one ste...

Perawatan di kedokteran gigi mulai menggunakan material fiber reinforced composite (FRC) sebagai bahan penyusun alat-alat tertentu seperti gigi tiruan cekat, restorasi onlay, splinting gigi goyah, pasak gigi dan space maintainer. Penyusun FRC terdiri dari fiber dengan jenis terbanyak glass fiber dan matriks berupa dental composite. Non dental glass...

E-glass fiber merupakan fiber reinforcement yang sering digunakan di kedokteran gigi karena berikatan baik dengan polimer melalui silane coupling agent, meningkatkan kekuatan mekanis dan tidak sensitif terhadap kelembaban. Ketersediaan E-glass fiber dental di Indonesia terbatas dengan harga relatif mahal. Glass fiber non dental banyak tersedia di I...

Amine-Modified Silica (AMS) and Quaternary Amine-Modified Silica (QAMS) has been synthesized through the sol-gel process for adsorption Au(III) in aqueous solution. The aim of this work was to compare the effect of addition three methyl group of AMS to form QAMS on its character, thermodynamics and kinetics parameter of sorption of Au(III) in aqueo...

Two novel materials of 2-aminobenzimidiazole (AB) and 1-(o-tolyl)biguanide (TB) modified silicas coated on the iron sand magnetic material (MM@SiO2/AB and MM@SiO2/TB) have been synthesized and were used to adsorb Au(III) from Au/Cu/Ni solution. Silica layering MM was modified with polyamino compounds via a sol-gel process using a sodium silicate so...

The adsorption of a solution mixture of Rhodamine B, Pb (II), Cu (II) and Zn(II) was studied using dynamic methods employing chitosan-silica-polyethylene glycol (Ch/Si/P) composite membrane as an adsorptive membrane. The composite Ch/Si/P membrane was prepared by mixing a chitosan-based membrane with silica isolated from rice husk ash (ASP) and pol...

Chitosan membrane (Ch) has mechanical stability, physical, and chemical low thus limiting their application to a variety of purposes. Therefore in this study examined the effect of adding silica and polyethylene glycol (PEG) on the mechanical properties, physical, and chemical chitosan-based membranes. A source of silica used is tetraethyl orthosil...

The synthesis of biodiesel from crude pond palm oil (CPO) fraction has been performed using ZrO2/SO3–H⁺ catalyst. The research was carried out via two processes. First process, i.e. catalyst preparation of ZrO2/SO3–H⁺ was performed through wet impregnation method by mixing 1 g ZrOCl2·8H2O with 15 mL (0.5 M) of H2SO4. The second process, involved th...

Diethylenetriamine (DETA) functionalized silica coated on magnetic material of iron sand ([email protected]–DETA) has been synthesized by sol–gel method. Synthesis was carried out by coating magnetic material of iron sand as the core with diethylenetriamine–modified silica using sodium silicate solution and N¹–(3–trimethoxysylilpropyl)diethylenetri...

Background: Restoration of the teeth immediately after bleaching with 35% hydrogen peroxide (H2O2) is contraindicated due to the remnant of free radicals that will stay inside enamel and dentin for 1-3 weeks and reduce the adhesion of composite resin. Sodium ascorbate is an antioxidant substance known to bind free radical residues, thereby shorteni...

Background: One of the composite resin composition is inorganic filler. The production of inorganic filler materials was highly dependent on non-degradable, and nonrenewable fossil fuels. Therefore, natural fibers can be used as substitute for inorganic fillers. One that can be developed is sisal. Purpose: This study aimed to determine the effects...

The effect of macrocycle ring size on the corrosion inhibition efficiency of dibenzo-12-crown-4 (DB12C4), dibenzo-15-crown-5 (DB15C5), dibenzo-18-crown-6 (DB18C6), dibenzo-21-crown-7 (DB21C7) and dibenzo-24-crown-8 (DB24C8) have been elucidated by mean of density functional calculation at B3LYP/6-31G(d) level of theory in the gas and aqueous enviro...

A gold ion imprinted triamino-functionalized silica gel sorbent was synthesized via a surface imprinting technique. The material gold ion imprinted triamino-silica hybrid (i-AuTSH) was prepared through sol-gel process using a solution of sodium silicate from rice hull ash (Na2SiO3)RHA as the silica source precursor and Au(III) ion as the template....

In this research, magnetite coated with L-arginine modified silica (Fe3O4/SiO2-GPTMS-Arg) has been synthesized through a sol-gel process at a room temperature in two Routes. In Route 1, a precursor of sodium silicate solution (source of SiO2), 3-glycidoxypropyltrimethoxysilane (GPTMS) as a coupling agent and L-arginine (Arg) as the source of functi...

Modification of silica coated on magnetic material iron sand with chitosan for adsorption of Au(III) has been carried out. Magnetic material (MM) from iron sand was separated using an external magnet, washed with water and HF solution 10%. MM–silica–chitosan material (MMSC) was synthesized via sol gel process and the product was characterized with...

The extraction of silica from rice husk ash (RHA) for the encapsulation of aflatoxin B1 antibody (Ab-AFB1) and its application as a matrix in immunoaffinity columns (IACs) were achieved. The RHA extraction was performed using 4 M NaOH, which yielded sodium silicate (Na2SiO3) for the synthesis of silica gel. The obtained silica was used for encapsul...