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Drs. Gunawan M.Si.
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Chemical Engineering, Chemistry & Bioengineering Chemistry Education

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PEMURNIAN GARAM KROSOK (NaCl) DENGAN PENAMBAHAN (NH4)2CO3-NaOH DAN PAC SEBAGAI BAHAN PENGIKAT IMPURITIES SERTA REKRISTALISASI MODEL SPRAY Solihat, Nissa Nurfajrin; A. Prasetya, Ssi. MSc., Nor Basid; , M.Si., Drs. Gunawan
Chem Info Journal Vol 1, No 2 (2013)
Publisher : Chem Info Journal

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Garam merupakan kebutuhan pokok manusia yang sampai saat ini belum ada substitusinya. Negara Indonesia masih harus mengimpor garam khususnya untuk keperluan industri karena rendahnya produksi garam yang dihasilkan oleh petani garam dan tidak ada hamparan lahan luas di kawasan pesisir pantai untuk dijadikan ladang garam berskala besar. Oleh karena itu diperlukan cara untuk mengatasi masalah ini. Tujuan penelitian ini adalah untuk memurnikan garam NaCl hasil petani garam agar sesuai dengan standar SNI dan SII untuk industri dengan biaya produksi yang rendah dengan menentukan volume optimum penambahan (NH4)2CO3 dan pengaruh PAC (Poli Alumunium Klorida) terhadap pemurnian garam. Metode yang dilakukan pada penelitian ini dengan cara menambahkan (NH4)2CO3 sebagai bahan pengikat impurities dengan variasi volume 0,8; 1,6; 2,4; 3,2; 4,0 mL lalu flokulan PAC serta penambahan NaOH yang dapat mengendapkan ion pengotor pada garam yaitu ion Ca2+ dan Mg2+, kemudian dilakukan modifikasi rekristalisasi dengan penguapan yaitu dengan model spray. Pada penelitian ini diperoleh kadar NaCl sesuai dengan standar SII dan SNI yaitu kadar air 2,11%; NaCl dengan kemurnian 98,93%; Ca2+ 0,01%; dan Mg2+ 0,09% pada penambahan (NH4)2CO3 20% sebanyak 3,2 mL dan PAC 10 ppm sebanyak 3 mL terhadap 200 mL larutan garam jenuh.
PENGARUH PASTA ZnO HASIL SINTESIS DENGAN PENAMBAHAN POLI VINIL ALKOHOL (PVA) DAN DISH DETERGENT TERHADAP EFISIENSI DYE-SENSITIZED SOLAR CELL (DSSC) DARI EKSTRAK BUNGA ROSELA(Hibiscus sabdariffa L.) Pratiwi, Rr. Dian; ,M.Si, Drs. Gunawan; ,M.Si, Khabibi
Chem Info Journal Vol 1, No 2 (2013)
Publisher : Chem Info Journal

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A study the effects of synthesized ZnO pasta with the addition of poly vinyl alcohol (PVA) and dish detergent on the efficiency of dye-sensitized solar cell (DSSC) of rosella flower extract (Hibiscus sabdariffa L.) had been done. The purpose of this study was to obtain ZnO from the precursor of Zn(CH3COO)2.2H2O with precipitation method as a semiconductor material in DSSC prototype and to determine the influence of synthesized ZnO pasta with poly vinyl alcohol and dish detergent to the dye-sensitized solar cell. The method used in this study with the manufacture of ZnO was by precipitation method using precursor of Zn(CH3COO)2.2H2O. The results obtained were analyzed by XRD, FTIR spectrophotometry, and SEM. ZnO crystals obtained had a size of 25.676 nm and pore size of 71.43 nm. ZnO was then used as a semiconductor in DSSC using dye rosella extract. ZnO pasta was added with variation of binders that attached to the FTO glass using PVA and dish detergent. The efficiencies obtained from each variation was 0.225x10-3% for PVA while 0.138 x10-3% for dish detergent. PVA binder can produce better efficiency of DSSC.
METODE ELEKTROFOTOKATALISIS DAN FOTOKATALISIS DENGAN TiO2 PADA DEKOLORISASI ZAT WARNA REMAZOL BLACK B DAN PENURUNAN KONSENTRASI ION LOGAM Cu2+ SECARA SIMULTAN Herlita, Ita; , M.Si., Drs. Gunawan; Haris, M.Si., Drs. Abdul
Chem Info Journal Vol 1, No 2 (2013)
Publisher : Chem Info Journal

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Has done research on use electrophotocataysis and photocatalysis methods by using TiO2 for decolorize of remazol black B dye and decrease the concentration of Cu2+metal ion simultaneously. This research was carried out by electrophotocatalysis is electrolyzing sample solution using and TiO2/FTO as anoda and C as cathoda at a potential of 3 volts and for the photocatalysis was done by the addition of 0.1685 grams of TiO2 powder in the sample solution. The two methods in the photocatalys reactor were irradiation with UV-C light and mixtured using 4 rpm for 210 minutes. Sample solution were analyzed by UV-Vis and AAS. The results showed that electrophotocatalysis more effective methods to decolorize dye solution of remazol black B and to decrease the concentration of Cu2+metal ion simultaneously. Decolorization percentage of remazol black B dye with electrophotocatalysis and photocatalysis methods were 98.65% and 31,05%, while the decrease percentage of Cu2+ metal ion concentration were 98.25% and 31,50% respectively.
METODE ELEKTROFOTOKATALISIS DAN FOTOKATALISIS DENGAN TiO2 PADA DEKOLORISASI REMAZOL GOLDEN YELLOW RNL DAN PENURUNAN KONSENTRASI ION LOGAM Cd2+ SECARA SIMULTAN N.R., Ade Novianti; , M.Si., Drs. Gunawan; Haris, M.Si., Drs. Abdul
Chem Info Journal Vol 1, No 2 (2013)
Publisher : Chem Info Journal

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Experiments on elektrofotokatalisis using TiO2 on decolorization remazol golden yellow RNL and decreased concentrations of Cd2+ metal ion simultaneously have performed. The purpose of this study was to compare the effectiveness of photocatalytic TiO2 in the form of thin layers of powder that was used to electrophotocatalyzed remazol golden yellow RNL and to reduce the concentration of metal ion of Cd2+. The electrophotokatalysis method use TiO2/FTO working electrode and photocatalytic TiO2 powder for 240 minutes. UV-Vis spectrophotometer was used to determine the absorbance decrease of remazol golden yellow RNL, while atomic absorption spectrophotometer (AAS) was used to determine the decrease concentration of metal ion Cd2+. The results obtained in this study for working electrode TiO2/FTO are more effective to decolorize remazol golden yellow RNL and to decrease the concentration of metal ion Cd2+ compared to the use of TiO2 powder. Electrophotokatalysis using TiO2/FTO working electrode was capable to decolorize remazol golden yellow RNL by 87.9% and to lower the concentration of metal ion of Cd2+ by 82.7%, while the photocatalytic method was only able to decolirize remazol golden yellow RNL by 25.87% and to decrease the concentration of metal ion Cd2+ amounted to 53.2%   
CORROSION RATE OF COPPER AND IRON IN SEAWATER BASED ON RESISTANCE MEASUREMENT W.H. Rahmanto; , Gunawan; Rahmad Nuryanto
JOURNAL OF COASTAL DEVELOPMENT Vol 5, No 2 (2002): Volume 5, Number 2, Year 2002
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

Copper and iron metal wire corrosion in artificial sea water have been investigated in three corrosion systems, in the (i) closed bath, (ii) opened or air exposed bath, and (iii) aerated bath. The aim of our investigation is to determine the effect of oxygen contained in the air to the metals’ corrosivity.  Artificial sea water was  prepared by dissolving 173.59 g sodium chloride and 4.91 g potassium chloride in 7.00 kg of water at 230C.The corrosion experiment was carried out under the constant temperature of 32 0C. Decrease of metal masses during corrosion was monitored by measuring the metal resistance change. Our experiment provided the corrosion rate in g.cm-2.s-1 as 4.01 x 10-7 (in closed bath), 4.01 x 10-6 (in opened bath) and 9.43 x 10-6 (in aerated bath) of copper metal, and 2.12 x 10-6 (in closed bath), 5.99 x 10-6 (in opened bath), and 1.07 x 10-5 (in aerated bath) of iron metal. Experimental results show that air oxygen give strong effect on the corrosion of copper and iron metal
Co-Authors Ade Novianti N.R. Drs. Abdul M.Si. Haris Ita Herlita khabibi Khabibi Nissa Nurfajrin Solihat Nor Basid Adiwibawa Prasetya Rahmad Nuryanto Rr. Dian Pratiwi W.H. Rahmanto