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Journal : Indonesian Journal of Fundamental and Applied Chemistry

Preparation And Characterization Of Cr/Activated Carbon Catalyst From Palm Empty Fruit Bunch Fanani, Zainal; Rohendi, Dedi; Dewi, Tri Kurnia; Dzulfikar A, Muhammad
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.i2.35

Abstract

Preparation and characterization of Cr/activated carbon catalyst from palm empty fruit bunch had been done. The research were to determine the effect of carbonization temperature towards adsorption of ammonia, iodine number, metilen blue number, and porosity of activated carbon and Cr/activated carbon catalyst. The determination of porosity include surface area, micropore volume and total pore volume. The results showed the best carbonization temperature activated carbon and Cr/activated carbon catalyst at 700°C. The adsorption ammonia of activated carbon and Cr/activated carbon catalyst as 6.379 mmol/g and 8.1624 mmol/g. The iodine number of activated carbon and Cr/activated carbon catalyst as 1520.16 mg/g and 1535.67 mg/g. The metilen blue number of activated carbon and Cr/activated carbon catalyst as 281.71 mg/g and 319.18 mg/g. The surface area of activated carbon and Cr/activated carbon catalyst as 1527.80 m2/g and 1652.58 m2/g. The micropore volume of activated carbon and Cr/activated carbon catalyst as 0.7460 cm3/g and 0.8670 cm3/g. The total pore volume of activated carbon and Cr/activated carbon catalyst as 0.8243 cm3/g and 0.8970 cm3/g.Keywords : activated carbon, palm empty fruit bunch, porosity, catalyst, chromium
Analyses of Non-bonding Length, Partial Atomics Charge and Electrostatic Energy from Molecular Dynamics Simulation of Phospholipase A2 – Substrate Syarif, Nirwan; Rohendi, Dedi
Indonesian Journal of Fundamental and Applied Chemistry Vol 1, No 3 (2016): October 2016
Publisher : Indonesian Journal of Fundamental and Applied Chemistry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v1.i3.72

Abstract

Abstract: This paper reports molecular dynamics simulation of phospholipase A2 (PLA2)– substrate that has been done. Non-bonding length, partial atomic charge and electrostatic energy were used to evaluation the interaction between PLA2 and substrate. The research was subjected for three types of PLA2 of different sources, i.e, homo sapien, bovinus and porcinus, by using computer files of their molecular structures. The files with code 3elo, 1bp2, dan 1y6o were downloaded from protein data bank.  Substrate structure can be found in 1y60 and was separated from its enzyme structure and docked into two other PLA2 structures for simulation purpose. Molecular dynamics simulations were done for 30000 steps with constant in number of molecules, volume and temperature (NVT). The results showed the existing of flip-flop mechanism as basic feature of PLA2 – substrate reactions. Interaction length analysis results indicated the presence of water molecules on the structures of 1bp2 and 3elo at the time of the simulation was completed. The existence of aspagine at the reaction site confirmed the theory that this amino acid is responsible for the survival of the reaction. the electrostatic energy increased substantially in the interaction after homo sapien PLA2 (3elo) and Bovinus (1bp2) with the substrate. Inverse effect took place in the PLA porcinus (1y6o).Keywords: flip flop, inflammation, in-silico, simulation Abstrak (Indonesian): Telah dilakukan penelitian tentang simulasi dinamika molekuler pada Situs Reaksi Phospholipase A2 (PLA2) dengan substratnya. Analisis panjang non-ikatan, muatan atom parsial dan energi elektrostatis digunakan untuk menilai interaksi antara PLA2 dan substratnya. Penelitian dilakukan pada tiga jenis sumber PLA2, yaitu homo sapien, bovinus dan porcinus dengan menggunakan file komputer untuk struktur molekul dengan kode 3elo, 1bp2, dan 1y6o. Pada file 1y60 terdapat struktur substrat yang dapat ditemukan secara alamiah. Kedua file lainnya tidak mengandung struktur molekul substrat. Simulasi dinamika molekul dilakukan untuk 30.000 langkah dengan konstan dalam jumlah molekul, volume dan suhu (NVT). Hasil penelitian menunjukkan keberadaan mekanisme flip-flop sebagai fitur dasar reaksi PLA2 - substrat. Hasil analisis panjang interaksi menunjukkan bahwa kehadiran molekul air pada struktur 1bp2 dan 3elo pada saat simulasi dilakukan. Keberadaan aspagine di lokasi reaksi menegaskan teori bahwa asam amino ini bertanggung jawab untuk kelangsungan hidup reaksi. energi elektrostatik meningkat secara substansial dalam interaksi setelah homo sapien PLA2 (3elo) dan Bovinus (1bp2) dengan substrat. efek terbalik terjadi di porcinus PLA (1y6o).Kata kunci: flip flop, inflamasi, peradangan, in-silico, simulasi
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
The Light Transmittance and Electrical Conductivity Properties of Gelam Wood Carbon Nanosheet and Its Derivatives Syabaniah, Nyimas Febrika; Syarif, Nirwan; Rohendi, Dedi; Wandasari, Mellysa; Rengga, Wara Dyahpita
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.i3.126

Abstract

The research on the preparation and characterization of transparent electrode carbon nanosheet based gelam woods bark doped with SnO2-SbO2. XRD analysis showed peaks at 2? = 26.87°; 26.38° for carbon crystal and at 2? = 28.59°; 34.35° for SnO; at 2? = 51.99°; 62.20° for SbO2. SEM analysis show that the carbons have self-curling sheets that indicated defection in their surface. The carbons have self-curling sheets, which indicated that their surfaces have many defects. It assumed when exfoliation process is undergone, the layers was significantly decreased as sonication process and formed rCNSO. Diffractogram XRD of CNS, CNSO and rCNSO showed diffraction peak at 2?= 24.3°. Oxygen functional group in CNSO might cause an increasing of interlayers distance between hexagonal networks of carbon layer. It also affect electrical resistant or the conductivity. FTIR spectrum indicate that CNSO has several  absorption peaks at for ?OH stretch for free water and alcohol. At 2337 cm-1 was showed a carboxylic acid peaks and C=C stretch at 1627 cm-1. There is a skeletal vibration rCNSO structure occurred at each graphene layers. The ratio of the integrated intensities (IG/ID = 0.89 for CNS, 0.85 for CNS-O, and 0.93 for rCNSO of Raman spectroscopy is significantly high. Electrical conductivity of transparent electrode ranges from 1.26 x 10-7 Scm-1 ? 5.03 x 10-7Scm -1. The highest conductivity value on transparent electrode contained rCNSO.This result inferred that the usage of rCNSO can increase electrical conductivity. Therefore, the higher value of electrical conductivity can be related to the value of La. The average maximum absorption wavelength is observed at 350-530 nm which means that the transition of the electronic transition ???* occurs in the conjugated carbons system. Electrical conductivity of transparent electrode ranges from 1.26 x 10-7 Scm-1 ? 5.03 x 10-7 Scm -1. The highest conductivity value on transparent electrode contained rCNSO. The band gap values in the transparent electrode range from 2 eV - 3 eV which means they have conductor ? semiconductor characters.Keywords: Nanosheet, Carbon, Electrical, Conductivity, Derivate.