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In the present work, the usefulness of cetyltrimethylammonium bromide-modified palm oil fiber (CTAB-modified POF) for the removal of indigo carmine (IC) and 2,6-dichlorophenolindophenol (2,6-DCPIP) from aqueous solutions was investigated. Raw, NaOH-treated, and CTAB-modified POF were characterized by Fourier-transform infrared (FT-IR) spectroscopy,...
Citations
... However, the high percentage of desorption with NaOH could be due to ion exchange between the anionic TBBPA and the HOfrom the NaOH. Similar results were obtained by Ngaha et al., 2018 during the 2,6-dichlorophenolindophenol biosorption by palm residues. However, after several adsorption cycles, we observe a progressive decrease in the carbon, reaching an adsorption rate of 52,13 % in the fourth cycle (Fig. 8). ...
Tetrabromobisphenol A (TBBPA), due to its recognized harmful effects on the endocrine system, has drawn particular attention from scientists. Its presence in the environment has been proven in general, particularly in surface and groundwater. This study aims to eliminate TBBPA in batch mode in an aqueous medium using activated carbon based on a puck shell. The activated carbon (CRP) was characterized by advanced techniques such as EDX mapping, FT-IR, FE-SEM, XRD and N2 adsorption/desorption. The results revealed a high carbon content in the activated carbons with a surface of acidic functional groups. In addition, the Activated carbon (AC) exhibited an amorphous phase consisting of mesopores and micropores. The specific surface area obtained from the BET was 502 m²/g. Optimum conditions for TBBPA adsorption obtained from response surface methodology using Box-Behnken design were 200 mg for activated carbon, 15mg/L for TBBPA concentration at pH 7.6, a stirring time of 89 minutes, with a retention percentage of 87.9% corresponding to an absorbed quantity of 4,1 mg/g. Adsorption isotherms and kinetics showed a multilayer and favorable adsorption involving π-π interactions, the possibility of ion exchange, Van der Waals and hydrogen bonds. Computational modeling was carried out through functional density theory and Monte Carlo molecular modeling. These confirmed the experimental results, indicating a strong affinity between CRP and TBBPA in a slightly basic medium with an adsorption energy of -135.25 kcal/mol. The results of the desorption process using sodium hydroxide, water and ethanol as desorbing agents show that the CRP is reusable.
... Sawdust-activated carbon coated with a nanocomposite of lanthanum oxidegraphene oxide has been studied for the application of IC dye removal [28]. Mesoporous magnesium ferrite [29], CTAB-modified palm oil fiber [30], acid-modified pistia stratiotes dry biomass [31], hydrazine sulfate-activated red mud [32], and nanotubes [26] have successfully studied for IC dye sequestration. ...
The sequestration of orange G (OG) and indigo carmine (IC) dye by utilizing novel incense stick (IS) ash adsorbent was examined in the current study. The dye uptake capacity of the adsorbent was explored through several batch experiments. The efficiency of the adsorbent was studied by different factors viz. adsorbent dose, agitation time, pH, temperature, and dye concentration. The study of the kinetic model described that the pseudo-second-order model was more effective for orange G and indigo carmine dye removal. Adsorption equilibrium was examined by the Langmuir and Freundlich model. The data obtained from the isotherm study for both dyes were well described and fitted to the Langmuir model. The incense stick ash adsorbent material was characterized by SEM, EDAX, BET, and FTIR techniques. The porosity of the adsorbent surface is described by the BET surface area of 6.934 m²/g and the micropore surface area of 4.550 m²/g. At a dye concentration of 50 mg/L and adsorbent dosage of 200 mg, the maximum dye uptake for orange G and indigo carmine was found 26.10 mg/g and 20.53 mg/g, respectively. For OG dye, the values of the thermodynamic parameters ∆H⁰ and ∆S⁰ were 40.99 kJ/mol and 0.015 kJ/mol, and for IC dye, 58.81 kJ/mol and 0.191 kJ/mol respectively. Regeneration performance of the used adsorbent was investigated by alkaline treatment. In comparison to the IC dye, the OG dye desorbs at a greater rate of 42.56%. According to this study, using incense stick ash to remove textile dyes would be a cost-effective and environmentally friendly green alternative.
... Several e uent treatment methods include advanced oxidation, ltration, and adsorption [6,7]. The adsorption method is widely used for treating industrial e uents because of the simplicity of design [7]. ...
... Several e uent treatment methods include advanced oxidation, ltration, and adsorption [6,7]. The adsorption method is widely used for treating industrial e uents because of the simplicity of design [7]. ...
Removal of dyes using optimized and renewable adsorbent with high adsorption capacity remain a challenge. Rice husk was used as a raw material for the manufacture of a new CTAB-functionalized sodium silicate adsorbent. The adsorption capacity of raw rice husk, calcined rice husk (400, 600, 800, and 1000°C), and functionalized sodium silicate with CTAB (Cetyl Trimethyl Ammonium Bromide) was investigated. SEM, FTIR, TGA-DSC and zeta potential characterized the modified rice husks. Adsorption tests were carried out using Naphthol Green B (NGB) and Congo Red (CR) as dyes. Results showed that the calcination temperature influenced the sodium silicate adsorption capacity and enhanced the effect of functionalization by CTAB at 600°C as the optimum calcination temperature. The maximum adsorption capacities of CR and NGB were 73.04 and 86.59 mg g -1, respectively, which were higher than those generally observed in the literature. The optimal adsorption condition was pH of 6, 0.1 g of Na 2 SiO 3 -CTAB, 30 min of contact time, and 303K. The desorption using a 50% acetone solution of 0.1g Na 2 SiO 3 -CTAB showed a desorption capacity of 96.21 % and 92.32 %, respectively, for CR and NGB. Desorption results show that a combination of hydrogen bonds and Van Der Walls interactions occurred. Four cycles of adsorption/desorption were done, and the desorption rate decreased to 42.23% and 13.93% for CR and NGB, respectively. Thus, it can be concluded that sodium silicate modified with CTAB after calcination at 600°C is a potential low-cost adsorbent and renewable sorbent for the removal of dyes from industrial wastewater.
... These chemicals currently occupy an important place in the industrial sector. They are widely used in the paper, cosmetic, food and textile industries [1][2][3][4][5]. The continued release of these recalcitrant compounds into the environment leads to long-term accumulation in the ecosystem. ...
... Faced with the dangers posed by this dye, the search for solutions has led to the development of methods such as adsorption, flocculation/coagulation and chemical oxidation for its elimination in effluents [1,2,11,12]. However, techniques such as adsorption and flocculation can be very limited because some pollutants still persist in the medium after treatment [13]. ...
Biochar and ferromagnetic biochar obtained from the pyrolysis of dried mango seeds and modified using a hydrothermal method were used as catalyst for the heterogeneous degradation of indigo carmine in an aqueous medium. These prepared biochars were characterized using different techniques: Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The analyses of the results revealed the presence of iron oxide in the form of magnetite (Fe3O4) in the catalyst. The catalytic tests carried out with this composite material showed a significant degradation of indigo carmine. The maximum degradation of indigo carmine in the aqueous solution was reached after 240 min of agitation. The Fenton degradation process using irradiation with a 100 W electric lamp and hydrogen peroxide (concentration 4 mol/L) showed the best results at pH = 3. From this study, it emerged that the second-order kinetic model better described the degradation process, and it gave lower half-lives compared to those obtained with the first-order kinetic law. The study also showed that ferromagnetic biochar could be prepared from mango seeds and used for the degradation of indigo carmine in an aqueous solution.
... The maximum dose of IC in water must be less than 0.005 mg/L, according to the World Health Organization (WHO) recommendations [7]. Inhalation or ingestion of IC beyond this dose causes adverse effects on the health of living beings, namely severe hypertension, cardiovascular and respiratory effects, gastrointestinal irritation and even vomiting and diarrhea [8][9][10]. It is essential to treat wastewaters before discharge into nature. ...
... The spectra of raw and treated bean pods (Figure 3a) as well as those of raw and treated pistachio pods ( Figure 3b), had the same shape, proof that these materials had identical chemical groups. On the spectra of the different materials, there was a wide band in the 3500-3000 cm −1 region centered around 3329.54 cm −1 , characteristic of the stretching vibration of the OH groups of phenols, carboxylic acids or alcohols, and water present in hemicellulose, cellulose and lignin [8,[72][73][74]. In the 3000-2500 cm −1 region, a double peak in the different materials was observed, centered around the point 2916.95 ...
In this work, biomass lignocellulosic materials extracted via chemical and physical treatments from bean and pistachio pod waste were used for the optimized elimination of Indigo Carmine (IC) from aqueous medium, using a design of experiments methodology. The physicochemical properties of the studied materials (raw and treated counterparts) used for the sorption of IC were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with EDX, and thermal analysis. Key variables influencing the adsorption of IC, namely the initial IC concentration, the pH of the solution, the stirring time and the mass of adsorbents, were optimized by the central composite design (CCD) with three center points, the measured response being the amount of IC adsorbed. The optimal conditions obtained from the statistical analysis for the removal of IC were as follows: maximum adsorbed amounts of IC: 1.81 mg/g, 2.05 mg/g, 3.56 mg/g; 7.42 mg/g, 8.95 mg/g, 15.35 mg/g, for raw bean pods (RBS), BST1 and BST2 (bean pods chemically treated), and for raw pistachio pods (RPS), PST1 and PST2 (pistachio pods chemically treated), respectively. The pseudo-second-order nonlinear kinetics model well described the IC adsorption kinetics for RBS, BST1 and BST2, while the Elovich model was properly fitted by RPS, PST1, and PST2 biomaterials data. The Freundlich isotherm best described the shrinkage of IC on different sorbents. The good correlation of the experimental data of the IC with respect to the Freundlich isotherm indicated a multilayer adsorption with heterogeneous adsorption sites and different energies. The interest of this work consisted in developing analytical methods for the treatment of water polluted by dyes by using biosorbents, local biological materials widely available and inexpensive. The results collected in this work highlighted the interesting structural, morphological, and physico-chemical properties of the agro-waste used in the study, which properties allowed an important fixation of the target dye in solution. The research showed that the agro-waste used in the study are possible precursors to locally manufacture adsorbents at low cost, thus allowing the efficient removal of waste and dyes in liquid effluents.
... As a result, the primary goal of this research was to develop an adsorbent that could also adsorb anionic dyes in their individual and multi-component systems at neutral pH. Some published studies demonstrate that the modification of adsorbents such as like palm oil fiber [41], bentonite [42], rice husk [43], montmorillonites [44], sago hampas natural fiber [45], Fe 3 O 4 nanoparticles [46], Aspergillus versicolor biomass [47], aqai stalk [48], rice straw biomass carbon [49], spent mushroom [50], graphite [51], sawdust [52], carboxymethyl cellulose-sugarcane bagasse cryogels [53], walnut shell [54], wheat straw [55] etc. CTAB, a cationic surfactant, is an effective approach for improving the adsorption effectiveness of dyes and other pollutants. From an environmental standpoint, we noted the simple creation of CTABtreated RM-based CNT nano-composite without the usage of toxic chemical solvents. ...
In this study, an efficient, cost-effective, and environmentally friendly cetyltrimethylammonium bromide (CTAB) surfactant modified Pennisetum glaucum (RM) based composite containing 0.5% functionalized carbon nanotube (CNT) has been developed. The main aim of this study was to assess and optimize the synthesized adsorbent used for the removal of Reactive Red 35 (RR), Coomassie Brilliant Blue R-250 (BB), and Eriochrome Black-T (EBT) dyes in their single, binary, and ternary solutions by employing the Box Behnken Design (BBD) under Response Surface Methodology (RSM). According to the analysis of variance (ANOVA), the proposed quadratic model was significant, with a good correlation between the experimental and predicted data of the desired response, and it can be used to navigate the design space. Furthermore, the batch adsorption experiments of anionic dyes were conducted to discuss the bio-sorption kinetics, thermodynamics, isotherms, and possible adsorption mechanisms involved in single and multi-component systems were accordingly proposed. The equilibrium experimental data was best fitted to the monolayer Langmuir adsorption isotherm model, giving a maximum adsorption capacity of 210.97, 259.07, and 289.85 mgg⁻¹ for RR, BB, and EBT dyes, respectively, in individual component systems, at neutral pH conditions, and a pseudo-2nd-order kinetic model best followed the kinetic data. The modified Langmuir model was used to study the interactions among the dye molecules in multi-component systems, and the observed results indicate the synergistic and competitive behaviour of dyes. A regeneration study of the exhausted bio-composite evaluated the renewal efficiency. This requires simple processing methods and little expense than other adsorbents fabricated from costly materials. Ultimately, the CTAB treated Pennisetum glaucum based CNT composite could be adopted as an efficient, cost-effective, and environmentally benign green biosorbent.
... Thus, development of an adsorbent that can also remove anionic dyes at neutral pH was the main objective of the present study. Some earlier reports mentioned that the modification of adsorbents such as palm oil fiber [44], rice husk [45], bentonite [46], montmorillonites [47], Fe 3 O 4 nanoparticles [48], sago hampas natural fiber [49], Aspergillus versicolor biomass [50], rice straw biomass carbon [51], aqai stalk [52], graphite [53], spent mushroom [54], sawdust [55], walnut shell [56], carboxymethyl cellulose-sugarcane bagasse cryogels [57], wheat straw [58], montmorillonite clay [59,60] etc. with cationic surfactant is an effective technology to enhance the adsorption capacity of dyes as well as other pollutants [61]. ...
The simultaneous and efficient removal of anionic dyes at neutral pH is a challenging task and is thus attracting considerable attention to remediate wastewater. Herein, cetyltrimethylammonium bromide (CTAB) surfactant was used for the modification of Saccharum munja based bio-composite containing 1% functionalized carbon nanotube (CNT). The as-synthesized bio-composite was characterized and used to study the affinity and efficacy towards the removal of Coomassie Brilliant Blue R-250 (BB), Reactive Red 35 (RR) and Reactive Orange 107 (RO) dyes from the single and multi-component systems. Response surface methodology (RSM), with Box–Behnken design matrix was successfully employed for the optimization of operating parameters i.e., pH, adsorbent dosage and initial concentration of dyes. The proposed models were significant as per the analysis of variance (ANOVA) statistical analysis. Furthermore, the experimental data were well fitted with the pseudo-2nd-order kinetic model and the Langmuir isotherm model with a very high monolayer adsorption capacity for the single-component system, i.e., 1179.39, 109.41 and 22.14 mg/g for BB, RR and RO dyes respectively at neutral pH conditions. The interactive effects between dye molecules in binary and ternary systems were studied using the extended Langmuir model, which revealed competitive as well as synergistic behavior of dyes. Interestingly, the observed affinity trend, BB>RR>RO was explained on the basis of the proposed adsorption mechanism. Regeneration of the exhausted bio-composite depicted excellent reusability even after five adsorption-desorption cycles, which makes CTAB modified SM+CNT a promising candidate adsorbent for treating simulated dyeing effluents and the whole process is cyclic and eco-friendly.
The present work investigates the potential use of sodium silicate generated from rice husk ash and functionalized with cetyltrimethylammonium bromide (CTAB), for adsorption of Congo Red (CR) and Naphthol Green B (NGB) from aqueous solutions. The adsorption capacity of raw rice husk, calcinated rice husk (673, 873, 1073, and 1273 K), and functionalized sodium silicate were investigated. They were characterized by SEM, FTIR, TGA–DSC, and zeta potential analysis. The results showed that sodium silicate adsorption capacity and the functionalization effect were maximum at 873 K. The optimum adsorption conditions for CR and NGB onto Na2SiO3-CTAB adsorbent are as follows: contact time 30 min, pH 6, adsorbent dosage of 0.1 g, temperature 303 K, and initial dye concentration of 50 mg/L and 150 mg/L for NGB and CR, respectively. The maximum adsorption capacities for CR and NGB were recorded at 73.04 and 86.59 mg/g at 303 K, respectively. The pseudo-first-order kinetic model described well the adsorption of these dyes. However, Freundlich and Liu isotherm models described well the adsorption of NGB and CR, respectively. According to thermodynamic parameters, these adsorptions were endothermic and involved physical processes. Desorption capacities of 96.21% (for CR) and 92.21% (for NGB) were reached using 50% acetone solution. A maximum of four adsorption/desorption cycles was carried out. Thus, it can be concluded that sodium silicate modified with CTAB after calcination at 873 K is a potential low-cost adsorbent and renewable sorbent for the removal of dyes from industrial wastewater.
