Addy Rachmat, Addy
Dosen Jurusan Kimia FMIPA Universitas Sriwijaya, Inderalaya

Published : 4 Documents
Articles

Found 4 Documents
Search

Photodegradation of Permethrin using Photocatalyst Montmorillonite-TiO2 Rachmat, Addy; Said, Muhammad; Fatma, Fatma; Badarwi, Hardi Aji; Ramadhan, A.M.
Indonesian Journal of Fundamental and Applied Chemistry Vol 1, No 1 (2016): February 2016
Publisher : Indonesian Journal of Fundamental and Applied Chemistry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v1.i1.01

Abstract

            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
Production of Biodiesel from Esterification of Oil Recovered from Palm Oil Mill Effluent (POME) Sludge using Tungstated-Zirconia Composite Catalyst Hasanudin, Hasanudin; Rachmat, Addy
Indonesian Journal of Fundamental and Applied Chemistry Vol 1, No 2 (2016): June 2016
Publisher : Indonesian Journal of Fundamental and Applied Chemistry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v1.i2.42

Abstract

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  
Performance Test of Membrane Electrode Assembly in DAFC using Mixed Methanol and Ethanol Fuel with Various Volume Comparison Yulianti, Dwi Hawa; Rohendi, Dedi; Syarif, Nirwan; Rachmat, Addy
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 4, No 3 (2019): October 2019
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v4.i3.139

Abstract

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 ? 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
PENGGUNAAN KATALIS PALADIUM DALAM REAKSI ARILASI n-OKTILSILAN DENGAN 2-IODIDA-5-METIL TIOFEN Lesbani, Aldes; Rachmat, Addy; Mohadi, Risfidian; Eliza, Eliza
Molekul Vol 9, No 1 (2014)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (594.063 KB) | DOI: 10.20884/1.jm.2014.9.1.146

Abstract

Telah dilakukan proses arilasi n-oktilsilan dengan 2-iodida-5-metil tiofen mengunakan katalis palladium dengan teknik reaksi kopling untuk mendapatkan variasi senyawa hasil arilasi. Produk hasil arilasi yang terbentuk dimurnikan dengan metode kromatografi kolom silika dengan eluen etil asetat dan dikarakterisasi menggunakan spektroskopi massa, spektroskopi 1H NMR, 13C NMR, dan DEPT-135. Hasil penelitian menunjukkan bahwa senyawa yang terbentuk dari hasil arilasi yakni tris(5-metil-2-tiofen)oktilsilan yang berupa cairan tak berwarna dengan nilaim/z sebesar 432. Hasil pengukuran menggunakan spektroskopi 1H NMR menghasilkan tujuh proton ekivalen. Pengukuran menggunakan spektroskopi 13C NMR menghasilkan tiga belas karbon ekivalen yang kemudian dikonfirmasi dengan DEPT-135. Hasil karakterisasi menggunakan spektroskopi massa dan spektroskopi NMR (H dan C) menunjukkan senyawa hasil sintesis adalah tris(5-metil-2-tiofen)oktilsilan.