Nur Hidayati

Universitas Muhammadiyah Surakarta · Chemical Engineering

The production of biodiesel from triglycerides containing vegetable oils transesterification provides over 10 wt.% raw glycerol. One of the glycerol utilizations is via its liquid phase acetylation to corresponding acetins. Glycerol acetylation is typically carried out catalytically using acidic catalysts.. This work reported graphene oxide nanorib...

Plastik bio-komposit ramah lingkungan dari kitosan dan umbi porang dibuat dengan metode casting larutan. Penelitian ini bertujuan untuk mengkaji pengaruh penambahan zat pemlastik gliserol (5, 10, 15, 20, dan 25) terhadap sifat mekanik bioplastik seperti sifat kuat tarik dan kemuluran, sifat biodegradasi, kemampuan serap air dan analisis gugus fungs...

Eugenyl acetate is used in various industries including the pharmaceutical industry, the food and beverage industry, the vegetable pesticide industry, as well as a bio-additive fuel. Eugenyl acetate can be obtained synthetically by esterification of eugenol and acetic acid using an acid catalyst. The purpose of this study was to examine the heterog...

The world’s energy needs are increasing as the human population increases. The fulfillment of fossil-based energy has reached optimal conditions and is predicted to decline in the future. One potential that can be developed to meet future energy needs is dye-sensitized solar cell (DSSC). DSSC is an efficient third generation that produces green ene...

The present work deal with the fabrication and characterizations of composite membranes composed of sulfonated poly (ether ether ketone) with polyvinyl alcohol and reinforced with cesium phosphotungstic acid (Cs-HPW), graphene oxide (GO), and silica-carbon nanotube (SCNT). Compared to the blank sPEEK-PVA membrane, the uptake of composite membranes...

Biodiesel is a substitute fuel that is environmentally friendly, biodegradable, and sustainable. The need for biodiesel continues to increase. Biodiesel is made through the process of transesterification of triglycerides and alcohol. Glycerol is a side-effect of biodiesel products with a capacity of 10% of the total weight of its production. Glycer...

Direct Methanol fuel Cell (DMFC) merupakan teknologi sel bahan bakar yang mengubah energi kimia menjadi energi listrik secara langsung. Polieter eter keton tersulfonasi (sPEEK) berpotensi sebagai proton exchange membrane. Modifikasi sPEEK dengan poli vinil alkohol (PVA) dan penambahan grafena oksida (GO) diharapkan dapat mengurangi methanol cross o...

The way out of the energy crisis is to divert national energy needs with the use of new and renewable energy. Bioenergy such as biodiesel is the expected one of those. Algae which has the potential to be used as raw material for making biodiesel is microalgae because it is easier in its cultivation. The microalgae used in this study were Nannochlor...

Abstrak. Lembaran film bio-komposit yang ramah lingkungan berbasis pada kitosan/polivinil alkohol (PVA) yang diperkuat dengan selulosa dari jerami padi dibuat dengan metode casting. Film kitosan terkendala dengan sifat fisik nya yang lemah terhadap tarikan dan regangan. Penambahan senyawa pemlastis seperti PVA dapat meningkatkan elastisitas film da...

Direct Methanol Fuel Cell (DMFC) can operate at low temperatures, but efficiency and performance are greatly influenced by the material. On the other hand, sulfonated ketone polyether ethers (sPEEK) which have high thermal resistance, ductile, chemical resistance and high mechanical properties, can be combined with chitosan which has good proton co...

The challenge of commercialization of fuel cells in Indonesia is mainly the caused by high manufacturing costs, particulary the cost of electrolyte membrane which is one of the important components of fuel cells. The use of inexpensive and abundant local materials such as sulfonated polyether ether ketone polymers and chitosan, to replace the curre...

A series of fly ash-based heterogeneous acid catalysts were prepared by chemical and thermal treatment. Fly ash was chemically activated using sulfuric acid and followed by thermal activation. Characterization methods of XRD, BET, SEM-EDX, and the performance in esterification of eugenyl acetate production was carried out to reveal the physical and...

Used cooking oil has the potential as biodiesel so that it can reduce environmental pollution. Transesterification of triglycerides in used cooking oil with an alcohol to form methyl esters of fatty acids or biodiesel and glycerol. The type of catalyst is one of the determinants of the transesterification reaction and coal fly ash has the potential...

Abstrak. Lembaran film bio-komposit yang ramah lingkungan berbasis pada kitosan/polivinil alkohol (PVA) yang diperkuat dengan selulosa dari jerami padi dibuat dengan metode casting. Film kitosan terkendala dengan sifat fisik nya yang lemah terhadap tarikan dan regangan. Penambahan senyawa pemlastis seperti PVA dapat meningkatkan elastisitas film da...

Direct Methanol Fuel Cell (DMFC), uses a proton exchange polymer electrolyte which one of the key components developed to realize the commercialization of fuel cells in transportation and portable equipment. Poly Ether Ether Ketone (PEEK) is a thermoplastic material that has a combination of physico-chemical and good mechanical properties. The intr...

The low cost of ABS polymer and natural polymer chitosan offer attractive chemical and physical properties for direct methanol fuel cells (DMFC). In this contribution, investigation of blend membrane made of ABS and chitosan, and their characterization for water uptake, swelling degree and ion exchange capacity (IEC) and methanol crossover are repo...

Indonesia is a tropical country that is rich in natural resources, including various kinds of plants that can be used as natural dyes. Currently back to nature trend is causing the development of the use of natural dyes to increase. This encourages research to focus in natural dyes. Alternative raw materials used are fresh or dried tropical almond...

The proton exchange membrane is a key component of Direct Methanol Fuel Cell (DMFC) as proton conductor and also fuel separator. Some novel polymeric electrolyte membranes for DMFC with have been developed to lower methanol permeability but are able to work at sufficient conductivity. The composite of the natural polymer chitosan and sulfonated pol...

Direct Methanol Fuel Cell (DMFC) is fuel cell that converts directly chemical energy in methanol into electrical energy and can be used as a power source for portable electric devices. Compared to Proton Exchange Membrane Fuel Cells (PEMFCs) which use hydrogen as the fuel, DMFC has some advantages, yet methanol-crossover remains a challenge to be s...

The extraction of Indigofera Tinctoria Linn leaf into natural dyes was studied using two methods: maceration and ultrasonication. Other variables tested were the differences in the degree of solvent acidity used: neutral, alcoholic, acid and base. The yield and the dye strength measured by the absorbance are response to the change of those variable...

Abstrak. Penelitian ini bertujuan membandingkan metode pengadukan magnetik dengan metode ultrasonikasi dalam mengisolasi alfa-selulosa, yang merupakan bahan baku pembuatan selulosa asetat, dari batang pisang klutuk (Musa balbisiana Colla) melalui proses pelarutan-pengendapan, bleaching, dan pengeringan. Proses pelarutan dan pengendapan menggunakan...

The current tinting industries return to the use of natural dyes because of their characteristics including safe and environmentally friendly. Indonesia can widely promote the potential of natural colours due to the availability of abundant natural dye plants. One of the potential plants that generates blue colour is Indigofera tinctoria. This rese...

Even though platinum is known as an active electro-catalyst for ethanol oxidation at low temperatures (< 100 oC), choosing the electrode material for ethanol electro-oxidation is a crucial issue. It is due to its property which easily poisoned by a strong adsorbed species such as CO. PtSn-based electro-catalysts have been identified as better catal...

Even though platinum is known as an active electro-catalyst for ethanol oxidation at low temperatures (< 100 oC), choosing the electrode material for ethanol electro-oxidation is a crucial issue. It is due to its property which easily poisoned by a strong adsorbed species such as CO. PtSn-based electro-catalysts have been identified as better catal...

Coal tar can be used as an alternative raw material for the production of liquid fuels, such as: gasoline and diesel through hydrogenation and cracking process. Hydrogenation and cracking process requires a catalyst which has metal components for hydrogenation reaction and acid components for cracking reaction. In this study, the Co/Zeolite Y and C...

Recently the condition of agriculture in Indonesia needs to be addressed. Soil fertility getting damaged due to chemical fertilizer that is not impartial. In addition, the impact of excessive use of synthetic pesticides can cause damage to the ecosystem. Control of plant diseases using biological agents began getting attention because of public con...

Biodiesel adalah campuran alkil ester yang merupakan alternatif bahan bakar diesel dan dapat diproduksi dari minyak nabati dan lemak hewan. Minyak jarak pagar (Jatropha Curcas) memiliki prospek yang baik sebagai bahan baku biodiesel karena minyak jarak pagar bukanlah minyak makan sehingga penyediaannya tidak bersaing dengan kebutuhan minyak makan n...

A study of a vapor feed DMFC using PBI loaded with phosphoric acid is reported. The anode catalyst was a Pt-Ru alloy and the cathode Pt, both supported on carbon black. Performance of the fuel cell with low methanol concentrations is reported and in situ measurements of anode and cathode potentials were used to diagnose the fuel cell performance. T...