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JURNAL KIMIA SAINS DAN APLIKASI

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Published by Universitas Diponegoro

ISSN : 14108917 EISSN : 25979914 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

urnal Kimia Sains dan Aplikasi (p-ISSN: 1410-8917) and e-ISSN: 2597-9914) is published by Department of Chemistry, Diponegoro University. This journal is published four times per year and publishes research, review and short communication in field of Chemistry.

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Articles 9 Documents

Search results for , issue "Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018" : 9 Documents clear

Synthesis of ZnO/NiO Thin Film on Fluorine-doped Tin Oxide (FTO) by Two Step Electrodeposition as Photoanode of a Solar Cell Ines Ayu Handayani; Abdul Haris; Didik Setiyo Widodo
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Synthesis of ZnO/NiO Thin Film on Fluorine-doped Tin Oxide (FTO) by Two Step Electrodeposition has been conducted. The film was used as a photoanode of a solar cell. Synthesis was performed by two step electrodeposition with FTO as anode and carbon rod as cathode. NiO was firstly electrodeposited at 2.4 V from 0.2 M of NiCl2 solution at pH 11, 70°C, under stirring of 250 rpm after air bubbling. Second step, ZnO was electrodeposited at 2.6 V from precursor Zn(NO3) 0.2 M, pH 12, 70°C with air bubbling and stirring of 250 rpm. Product was then calcined at 450°C for 2 hours followed with XRD characterization. A solar cell was constructed by utilizing the ZnO/NiO film as photoanode related to aluminium plat as cathode. Data resulted showed that the efficiency in NiO deposition was 39.4% with mass of 8 mg and 16 µm in thin film size. Efficiency in ZnO deposition was 12.7% with mass of 14.7 mg and 11 µm in thin film size. XRD data informed that NiO and ZnO were thin filmed to FTO substrate with powder size of 30.31 nm and ZnO of 21.07 nm. Photovoltaic activity test with illuminating UV light 15 W onto the film resulted in that the average voltages of 240.93 mV and current density of 7.34 mA/cm2. Under tungsten light of 15 W illumination the system produced average voltages of 166.20 mV and current density of 5.48 mA/cm2. Finally, the solar cell was tested under 7 W-LED illumination that was calibrated to silicon solar cell equal to sun light of 1.5 AM (100 mW/cm2) resulted in efficiency of 0.027%.

Comparative Test of Color Stability between Betalain Pigments of Red Dragon Fruits and Anthocyanin Pigments from Tamarillo Fruit at Various pH Yelfira Sari; Adlis Santoni; Elisabet Elisabet
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Betalains and anthocyanins are classes of natural and water soluble pigments. Now days, these pigments have been developed as a replacement colouring agents. One of betalain resource is dragon fruit and anthocyanin resource is tamarillo. These pigments are relative unstable in some condition, one of them is pH. This research aim is to determine stability of betalain and anthocyanin pigments by pH parameter. These pigments can be isolated by macerated methods, technically processed by chopping the fruit and than soaking in ethanol for ± 24 h. These extracts were condensed by rotary evaporator. These extracts were analysed by ultraviolet-visible spectrophotometer at wavelength (λ) 200-800 nm. The absorption spectrum showed two major absorption peaks at 269 nm and 536 nm for betalain and 531 nm for anthocyanins. The result showed the optimal pH for betalain stability was at pH 5 and pH 3 for anthocyanin

Fragrance Formation in the of Cocoa Roasted Process (Theobroma cacao) with Roaster Temperature Variation using a Vacuum Drying Oven Monang Sihombing; Dhanang Puspita; Mayer Tinting Sirenden
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Chocolate is cacao nib processed product which is favorite commodity in the world, nevertheless, many of consumer have not known about the process. Notable stage in cacao processing is roaster process. Cacao roasting process currently uses conventional methods, which have weaknesses like energy wastage and bioactive compounds damage. Vacuum drying oven is new roasting method which uses low pressure and temperature. Through this research, the difference of aroma development between roasting process on conventional and vacuum drying oven method was investigated. Roasted cacao was extracted by water distillation, then distillate was separated by diethyl ether partition. The extract was characterized with GC-MS. The Characterization result shown that temperature 70°C contained 11 volatile compounds and temperature 80°C, 90°C and 140°C contained 7 volatile compounds. The higher roasting temperature, the more diverse of volatile compound. The best result in cacao roasting was on vacuum drying oven at 90°C, which has similar aroma with 140°C as control sample.

Assessing the Composition of 19th Century Lime Mortars from a Mission Chapel in the Former Hacienda de San Isidro de Mariquina Philippines Jan-Michael Cayme; Renz Matthew L. L. Aurellano; Carmen Luisa P. Cabral; Gellyn Ann R. Alonzo; Aniano N. , Jr. Asor
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

This paper presents the results of a chemical study on lime mortars manufactured during the Spanish Colonial Period in the Philippines. Lime mortar samples, MRK-01 and MRK-02, were obtained from the facade of a historical mission chapel in Marikina City. The nature of the aggregate and binder components in these mortar samples were determined by performing sieve analysis and classified to be poorly graded with uniform gradation. An aggregate to binder ratio of approximately 1:1 was computed based on the solubility of the individual sieved fractions in hydrochloric acid. The silicate character of the aggregate was confirmed by the absorbance peaks attributed to silicon dioxide (SiO2) in the Fourier Transform Infrared Spectroscopy (FTIR). Natural river sand was used as aggregates in both mortar samples which is apparent from the particle shapes of the sieved fractions. There was also no evidence of sea shells, broken potteries, brick fragments and bulk unburned limestone used as aggregates in any of the mortar samples tested. The binder portion is mainly calcitic or calcium carbonate (CaCO3) based on the FTIR spectra and was shown to be removed by hydrochloric acid digestion. Titration method using ethylenediaminetetraacetic acid (EDTA) was employed to determine the amount of calcium in the acid soluble fractions. The percentage of calcium for MRK-01 ranges from about 1.0% to 9.5%, while MRK-02 ranges from about 2.3% to 16.8%, respectively. These percentages indicate that MRK-02 was manufactured with more lime binder compared to MRK-01. From this study, a simple method of understanding the composition of old lime mortars in the Philippines was established, which is useful for general heritage conservation work.

Effect of Lactose Concentration as Lactobacillus bulgaricus Substrate on Potential Cells Produced in Microbial Fuel Cell Systems Riska Anggri Kusuma; Linda Suyati; Wasino Hadi Rahmanto
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

The effect of laxose concentration as Lactobacillus bulgaricus bacterial substrate on the cell potential produced in Microbial Fuel Cell System has been done. This study aims to determine the effect of lactose concentration as bacterial substrate, to generate electricity, maximum electric potential and determine the potential value of standard lactose (E ° Lactose.) Based on Nernst equation. The MFC system of two compartments and bridges of salt as a linkage is used in this study. Anode contains lactose with variation of concentration 3 - 7% and bacteria. The cathode contains a 1M KMO4. The electrodes used are graphite. MFC operational time is 14 days. The results showed that the lactose concentration had an effect on the cell potential produced in the MFC system. Maximum cell potential yielded at 4% lactose concentration, that is 710 mV then based on Nerst equation theory obtained E ° Lactose value in MFC system of + 0,236 V.

Biolubrication Synthesis Made from Used Cooking Oil and Bayah Natural Zeolite Catalyst Agus Rochmat; Athia Hasna Nurhanifah; Yunita Parviana; Suaedah Suaedah
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Automotive growth in Indonesia continues to increase, thus the needed of material that supported such as lubricants have also increased. To support environment to have a sustainable development, the world needs biodegradable lubricant or biolubricant. Biolubricant can match the characteristics and replace the function of petroleum-based lubricants. The biolubricant base material at the moment was the vegetable oil through a series of physically and chemically modified. This research synthesizes used cooking oil into biolubricant using natural zeolite catalyst, which in its production included esterification process of used cooking oil, synthesis of methyl ester and biolubricant synthesis. Biolubicant synthesis was conducted by variation of methyl ester mole ratio with ethylene glycol of 1:13-40 and catalyst mass range of 0.5%-3%. The results of the study showed that the highest yield was 83.46%, density 0.8994 g/mL, viscosity 40°C 52.90 cSt and at 100°C 8.74 cSt, the pour point 6°C and the flash point 278°C.

Synthesis of Zeolite from Bagasse and Rice Husk Ashes as Surfactant Builder on Detergency Process: Variation of NaOH Concentration for Silica Isolation Arnelli Arnelli; Bara Yunianto Fathoni; Teguh Iman Prastyo; Ahmad Suseno; Yayuk Astuti
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Zeolite was successfully synthesised from ash bagasse and from rice husk ash as source of silica and applied to surfactant builder. The removal of silica from bagasse ash and from rice husk ash was influenced by NaOH concentration to obtain sodium silicate. This research aimed to synthesize zeolite, determine the optimum concentration of NaOH to synthetic zeolite, identify the zeolite mineral type, morphology, determine cation exchange rate and detergency by using synthesized zeolite as builder. Synthesis of zeolite was undertaken by sol-gel method followed by hydrothermal process. The stages of this study included the production of bagasse and rice husk ashes, isolation of silicate using a variation of NaOH concentration of 1.67, 3.33, 5.00, 6.67 and 8.30 M in the form of sodium silicate. Synthesis of zeolite was carried out by reacting sodium silicate and sodium aluminate using hydrothermal method. The synthesized zeolites were characterized using XRD and SEM. The results of this research indicated the types of zeolite minerals formed, namely, zeolite A, Na-A, Na-Y and sodalite. The morphology of the synthesized zeolites from both samples was quite homogeneous, NaOH concentration used to produce zeolite from bagasse ash was 1.67 M with value of cation exchange capacity (CEC) and detergency were respectively 121.14 mek/100 gram and 92.09% while synthesis zeolite from rice husk ash was generated using 8.3 M NaOH concentration with value of cation exchange capacity (CEC) and detergency were 65,71 mek / 100 gram and 94,313%, respectively.

Potential Oxidative Treatment Using Pb-PbO2 Electrode in Electrodecolorizing Batik Wastewater Didik Setiyo Widodo; Rahmad Nuryanto; Abdul Haris; Prihastuti Santini Laksmi Dewi; Lutfia Apipah
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Electrodecolorization of batik wastewater has been done. Study was performed to remediate aquatic environment containing dyes of batik industry by electrolysis, decreasing COD and some metal ions as well. Research was conducted by electrolyzing sample from Buaran Pekalongan and Semarang using Pb and PbO2 as electrodes at a constant applied potential. Solution after treating were analysed, zeolite sieving treatment, and final analysis by UV-Vis spectrophotometer for measuring decolorization percentages, atomic absorption spectrophotometerer (AAS) for evaluating metal ions of Cu2+, total Fe and Na+, and COD analysis. Results show that electrolysis of batik wastewater using PbO2 as anode effectively decolorize and decreasing COD values. Sample containing indigozol and remazol black B (RBB) were decolorized up to 100%. CODs were reduced to 98.6% and 95.4%, respectively. Zeolite treatment enhancing water quality by reducing ion concentration of Cu2+, total Fe ions and Na+.

Silica Magnetite Adsorbent: Effect of Drying Temperature of Silica Sol Gel on Magnetite Core Structure Endang Sawitri; Choiril Azmiyawati; Parsaoran Siahaan
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Recently, magnetite was investigated as water purification adsorbent because it’s unique magnetic properties that improved the adsorption efficiency through desorption process. But magnetite oxidized into maghemite/hematite with the increase of temperature. This transformation should be avoided to maintain the magnetic properties of magnetite. In this research magnetite separated from iron sand by magnetic extraction then coated with silica via sol gel method. The effect of drying temperature in sol gel had change the magnetite core structure into maghemite and found no formation of hematite at 350⁰C. Silica coating proved had protected magnetite from transformation into hematite due to drying temperature until 350⁰C .

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Adi Darmawan

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Home Page

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Contact Name Adi Darmawan

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Location Kota semarang, Jawa tengah INDONESIA

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Contact Name
Adi Darmawan

Contact Email
adidarmawan@live.undip.ac.id

Phone
-

Journal Mail Official
jksa@live.undip.ac.id

Editorial Address
-

Location
Kota semarang,

Jawa tengah

INDONESIA