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<![CDATA[ISOTERM ADSORPSI-DESORPSI DAN POROSITAS KATALIS Ag-TiO 2 /ZEOLIT ]]>
<![CDATA[Hasanudin, Hasanudin]]>;
<![CDATA[Rachmat, Addy]]>
<![CDATA[ Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Sainmatika Volume 7 No. 2 Desember 2010 ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Science, Universitas PGRI Palembang ]]>
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DOI: 10.31851/sainmatika.v7i2.10
<![CDATA[ABSTRAKPenelitian tentang Isoterm Adsorpsi-Desorpsi dan Porositas Katalis Ag âTiO 2 /Zeolit telah dilakukan. Katalis ini dibuat dengan penambahan oksida logam TiO 2 dan impregnasi logam Ag dengan variasi jumlah logam Ag yaitu 1%, 10%, 20%. Karakterisasi katalis meliputi pola topografi dengan Scanning Electron Microscope (SEM) dan analisis isoterm adsorpsi dengan menggunakan Gas Sorption Analyzer.Tipe isoterm adsorpsi yang terbentuk berdasarkan klasifikasi BDDT adalah tipe II dan isoterm desorpsi yang terbentuk berdasarkan klasifikasi BET adalah tipe C. Hasil penelitian menunjukkan bahwa adanya pori yang membesar akibat penambahan logam TiO 2 sehingga meningkatkan luas permukaan spesifik, total volume pori, dan jari-jari pori rata-rata katalis. Pengaruh impregnasi logam Ag pada katalis mampu menurunkan luas permukaan katalis senilai 129,94% dan menurunkan total volume pori senilai 34,81% namun dapat meningkatkan jari-jari pori rata-rata senilai 70,56%.Kata kunci: Zeolit, porositas, katalis]]>
<![CDATA[A Review on Production of Hydrogen from Renewable Sources and Applications for Fuel Cell Vehicles ]]>
<![CDATA[Rohendi, Dedi]]>;
<![CDATA[Rahmah, Dea]]>;
<![CDATA[Yulianti, Dwi]]>;
<![CDATA[Amelia, Icha]]>;
<![CDATA[Sya'baniah, Nyimas]]>;
<![CDATA[Syarif, Nirwan]]>;
<![CDATA[Rachmat, Addy]]>
<![CDATA[ http://dx.doi.org/10.31427/IJSTT.2018.1.2.5 ]]>
Publisher : <![CDATA[Unijourn Publisher ]]>
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<![CDATA[Hydrogen gas is an energy carrier that has many advantages, including energy density for high mass and environmentally friendly. Hydrogen can be produced from various sources by numerous methods. Hydrogen production from renewable sources is interesting, due to the sustainable and inexpensive supply of the raw materials. Among the sources of renewable raw materials for hydrogen production are water and biomass with various production methods. It consists of the electrolysis of water with acidic and basic conditions, as well as thermochemical and biochemical biomass conversion.]]>
<![CDATA[Photodegradation of Permethrin using Photocatalyst Montmorillonite-TiO2 ]]>
<![CDATA[Addy Rachmat]]>;
<![CDATA[Muhammad Said]]>;
<![CDATA[Fatma Fatma]]>;
<![CDATA[Hardi Aji Badarwi]]>;
<![CDATA[A.M. Ramadhan]]>
<![CDATA[ IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 1, No 1 (2016): February 2016 ]]>
Publisher : <![CDATA[IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) ]]>
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DOI: 10.24845/ijfac.v1.i1.01
<![CDATA[ Photocatalyst Montmorillonite-TiO2 was synthesized using template CTAB and natural clay for degradation of Permethrin. The porosity and crystalline phase of catalyst were evaluated using N2 sorption analyzer and XRD diffraction. Permethrin photodegradation was optimized by varying reactant volume, irradiation time and initial concentration. Montmorillonite enhanced by CTAB showed typical porosity i.e. specific surface area, pore radii and pore volume for layer material. It properties decreased as this host material was impregnated with TiO2. XRD diagram indicated that space between layers of Montmorillonite expanded up to 4.7 Å. The diffractogram also confirmed that TiO2 formed an Anatase phase instead of Rutile. Photodegradation conducted at several condition showed relatively low photocatalytic activity. The highest photodegradation was achieved at 50 mL of Permethrin with initial concentration 10 ppm and 100 minutes’ irradiation. Keywords: Permethrin, Photodegradation, Montmorillonite-TiO2]]>
<![CDATA[Characterization of Electrode with Cu2O-ZnO/C and Pt-Ru/C Catalyst for Electrochemical Reduction CO2 to CH3OH ]]>
<![CDATA[Dea Radestia Rahmah]]>;
<![CDATA[Dedi Rohendi]]>;
<![CDATA[Nirwan Syarif]]>;
<![CDATA[Addy Rachmat]]>;
<![CDATA[Nyimas Febrika Sya'baniah]]>;
<![CDATA[Dwi Hawa Yulianti]]>
<![CDATA[ IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 6, No 1 (2021): February 2021 ]]>
Publisher : <![CDATA[IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) ]]>
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DOI: 10.24845/ijfac.v6.i1.08
<![CDATA[Electrode characterization has been carried out with Cu2O-ZnO/C and Pt-Ru/C catalysts to convert carbon dioxide to methanol. Characterization are carried out with XRD analysis, Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). The electrodes are made by distributing Cu2O-ZnO/C and/or Pt-Ru/C catalyst by spraying method. The results of XRD analysis showed that the characteristic peak of platinum was 2θ = 39.7⁰ - 40.74⁰ with an intensity of 970 cps and 1384 cps and the diffraction peak of Ru oxide was found at 47.02⁰ with an intensity of 923 cps. The peak of Cu2O characteristics appeared at 36.12⁰ with an intensity of 88 cps and the peak for ZnO characteristics at 68.2⁰ with an intensity of 13 cps. The test results with the cyclic voltammetry method showed that the electrode with a Cu2O-ZnO/C catalyst obtained the highest ECSA value which was 26.044 cm2/g, with an electrical conductivity value of 3.4 x 10-3 S/cm and a total real resistance of 5.9425 Ω .]]>
<![CDATA[Performance Test of Membrane Electrode Assembly in DAFC using Mixed Methanol and Ethanol Fuel with Various Volume Comparison ]]>
<![CDATA[Dwi Hawa Yulianti]]>;
<![CDATA[Dedi Rohendi]]>;
<![CDATA[Nirwan Syarif]]>;
<![CDATA[Addy Rachmat]]>
<![CDATA[ IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 4, No 3 (2019): October 2019 ]]>
Publisher : <![CDATA[IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) ]]>
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DOI: 10.24845/ijfac.v4.i3.139
<![CDATA[Direct Alcohol Fuel Cell (DAFC) performance is influenced by electrocatalysis reactions that occur in Membrane Electrode Assembly (MEA). In this study, MEA was made with Pt-Ru/C (anode) and Pt/C (cathode) catalysts. The results of the electrode characterization with XRD showed a carbon peak at 26.63° and Ru at 40.58°. Based on the results of Cyclic Voltammetry (CV) measurements, the Electrochemical Surface Area (ECSA) electrode value is known to be 373.601 cm2/mg. Meanwhile, the impedance value is 4.315 Ω and the electrical conductivity value is 6.61x10-4 S/cm. MEA testing using MeOH 3 M fuel produces Open Circuit Voltage (OCV) of 0.650 V. Meanwhile, MEA performance testing uses a mixture of methanol and ethanol 2 M in loading conditions obtained the best mixture of fuel composition is methanol: ethanol = 90:10 with a maximum power density of 4.34 mW/cm2 and is able to maintain the voltage at 0.649 V under conditions of 6.875 mA/cm2. The results also showed that the volume of ethanol which was too high resulted in a decrease in cell performance in the fuel mixture caused by the competition of adsorption between competing methanol and ethanol occupying the active site of the catalyst.Keywords: DAFC, fuel cell, Pt-Ru/C, ethanol, methanol, Open Circuit Voltage]]>
<![CDATA[Preparation and Characterization of Ti-Co/C catalyst for PEMFC Cathode ]]>
<![CDATA[Nurmalina Adhiyanti]]>;
<![CDATA[Dedi Rohendi]]>;
<![CDATA[Nirwan Syarif]]>;
<![CDATA[Addy Rachmat]]>
<![CDATA[ IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 6, No 3 (2021): October 2021 ]]>
Publisher : <![CDATA[IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) ]]>
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DOI: 10.24845/ijfac.v6.i3.109
<![CDATA[A Ti-Co/C catalyst was prepared using impregnation-reduction method and characterized using cyclic voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS) methods. This study aimed to compare the result between matrix carbon Vulcan XC-72R and Dots carbon which was applied to Ti-Co/C catalyst, also to compare the method of coating catalyst on GDL layer were Doctor Blade and spraying methods. The result was confirmed that Ti-Co/C with the ratio of Ti:Co 50:50, using Dots carbon as its matrix and spraying method preparation has ECSA value and conductivity respectively 28.72 cm2/g and 0.1688 x 10-3 S/cm, those were the highest value than another method. The conclusion of this study was non-platinum catalyst Ti-Co/C which used Dots carbon as a matrix and the spraying method showed a good response as a cathode catalyst of PEMFC]]>
<![CDATA[Hydrogen Adsorption/desorption on lithium Alanat Catalyzed by Ni/C for Sustainable Hydrogen Storage ]]>
<![CDATA[Icha Amelia]]>;
<![CDATA[Dedi Rohendi]]>;
<![CDATA[Addy Rachmat]]>
<![CDATA[ IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 6, No 2 (2021): June 2021 ]]>
Publisher : <![CDATA[IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) ]]>
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DOI: 10.24845/ijfac.v6.i2.59
<![CDATA[ LiAlH4 alloy has been believed to have the potential to become one of the hydrogen storages with high storage capacity. In this research, the formation of LiAlH4 alloys with dope and undope Ni/C catalysts and characterization and testing of hydrogen adsorption/desorption capacities using these alloys have been carried out. The alloy was made by the milling method and the resulting alloy was characterized using XRD analysis. The adsorption capacity test of the alloy was carried out by the gravimetric method at various pressures. The adsorption capacity of the LiAlH4 alloy by adding additives in the form of Ni/C as much as 5%w/w was proven to increase the hydrogen adsorption capacity compared to undope a catalyst with the highest storage capacity at a pressure of 3 bar of 13.06%w/w compared to undope a catalyst of 9.84%w/w at the same pressure. Meanwhile, the highest hydrogen desorption capacity was 53.56% w/w (dope catalyst) and 41.75% w/w (undope catalyst).]]>
<![CDATA[Optimization of Bio-Oil Pyrolysis Product from Palm Empty Fruit Bunches over H-Zeolite Catalyst using Response Surface Methodology (RSM) ]]>
<![CDATA[Zainal Fanani]]>;
<![CDATA[Addy Rachmat]]>;
<![CDATA[Hasanudin hasanudin]]>;
<![CDATA[Muhammad Said]]>
<![CDATA[ IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 6, No 3 (2021): October 2021 ]]>
Publisher : <![CDATA[IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) ]]>
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DOI: 10.24845/ijfac.v6.i3.122
<![CDATA[Bio-oil pyrolysis product considered as a promising resource of hydrocarbon compound that can be used as alternative fuel or other application. Palm empty fruit bunch (PEFB) based bio-oil converted into hydrocarbon trough pyrolysis over sulfate activation natural zeolite. Here, we reported an optimization process of bio-oil pyrolysis specifically on temperature and catalyst dose variables by using response surface methodology (RSM). Prior conversion process, PEFB was analyzed to determine cellulose, hemicellulose and lignin content. Sulfate activation natural zeolite confirmed its acidity by ammonia and pyridine adsorption calculated by gravimetric method. Two independent variables namely temperature and catalyst weight used in optimization process by RSM whereas response variable is conversion percentage. Analysis result on cellulose, hemicellulose and lignin content are 45.39%, 30.36% and 20.5% respectively. Catalyst acidity determination based on ammonia and pyridine adsorption gave 1.002 mmol/g and 0.1994 mmol/g. Optimum condition of hydrocracking achieved at 568 °C and 2.1088 g catalyst weight with the product obtained at 62.21% conversion. The best product density is 1.086 g/mL obtained at hydrocracking temperature 554 °C and 2.0362 g catalyst. Based on GC-MS analysis, it was confirmed that the product comprises more straight-chain hydrocarbon than cyclic one. RSM calculation able to formulate the feasible model equation to predict the conversion percentage. The equation is; percent conversion = 60.059 + 14.268T + 9.783W – 25.649T2 – 18.809W2 + 3.114TW, whereas model equation for response variable on product density; ρ= 1.09103 – 0.12356T – 0.09744W + 0.11489T2 + 0.28888W2 – 0.00740TW]]>
<![CDATA[Production of Biodiesel from Esterification of Oil Recovered from Palm Oil Mill Effluent (POME) Sludge using Tungstated-Zirconia Composite Catalyst ]]>
<![CDATA[Hasanudin Hasanudin]]>;
<![CDATA[Addy Rachmat]]>
<![CDATA[ IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 1, No 2 (2016): June 2016 ]]>
Publisher : <![CDATA[IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) ]]>
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DOI: 10.24845/ijfac.v1.i2.42
<![CDATA[Solid acid catalyst prepared from tungsten and zirconium oxide composite had been characterized and evaluated on biodiesel production by esterification of low quality oils taken from POME sludge. Catalyst characterization was conducted using Scanning Electron Microscopy (SEM) and acidity test. Acidity test of catalyst resulted using Gravimetry method is 5.4 mole/g. Esterification to produce biodiesel using tungsten and zirconium oxide composite show increasing amount of catalyst used will also increased conversion percentage of biodiesel produced and reach optimum value at 10%. Catalyst:oil ratio used to produce optimum conversion is 8:1 which converted 74.88% oil to biodiesel.Keywords: Tungsten-Zirconia composite, POME Sludge, EsterificationAbstrak (Indonesian). Penelitian tentang preparasi dan karakterisasi katalis komposit tungsten dan zirkonium oksida serta aplikasinya untuk esterifikasi minyak hasil recovery limbah sludge industri kelapa sawit telah dilakukan. Karakterisasi katalis dilakukan dengan menggunakan SEM dan uji sifat keasaman. Sifat keasaman katalis didapat sebesar 5,4 mol/g dengan metode gravimetri. Hasil pembuatan biodiesel dengan menggunakan katalis komposit tungsten dan zirkonium oksida didapatkan bahwa semakin besar jumlah katalis yang digunakan semakin besar pula % konversi biodiesel yang dihasilkan dan optimum pada 10%. Sementara perbandingan jumlah metanol:minyak didapatkan nilai optimum pada perbandingan 8:1 dengan % konversi biodiesel sebesar 74,88%.Kata Kunci: Tungsten-Zirconia composite, POME Sludge, Esterifikasi ]]>
<![CDATA[Removal of Pb(II) using Hydroxyapatite from Golden Snail Shell (Pomacea canaliculata L.) Modified with Silica ]]>
<![CDATA[Poedji Loekitowati Hariani]]>;
<![CDATA[Fahma Riyanti]]>;
<![CDATA[Fatma Fatma]]>;
<![CDATA[Addy Rachmat]]>;
<![CDATA[Aldi Herbanu]]>
<![CDATA[ Molekul Vol 15, No 2 (2020) ]]>
Publisher : <![CDATA[Universitas Jenderal Soedirman ]]>
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DOI: 10.20884/1.jm.2020.15.2.641
<![CDATA[The composites of hydroxyapatite and SiO2 were successfully synthesized. The hydroxyapatite was prepared from golden snail shells (Pomacea canaliculata L). The hydroxyapatite and hydroxyapatite-SiO2 composites were characterized using XRD, FTIR, SEM-EDS. Furthermore, hydroxyapatite and hydroxyapatite-SiO2 composites were used to remove Pb(II) from aqueous solution. Various adsorption parameters such as pH of the solution, contact time, and initial Pb(II) concentration were used to study the adsorption process. The optimum pH of the solution for removal of Pb(II) by hydroxyapatite and hydroxyapatite-SiO2 composite at pH 6 and contact time at 60 minutes. Both adsorbents follow the Langmuir isotherm. The maximum adsorption capacity of the hydroxyapatite-SiO2 composite is greater compare to hydroxyapatite, respectively 135.14 and 123.46 mg/g. The pseudo-second order kinetic model had a correlation coefficient (R2) greater than the pseudo-first order so pseudo-second order kinetic is better to describe adsorption kinetics]]>
