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Cahyorini Kusumawardani
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INDONESIA
Indonesian Journal of Chemistry and Environment
Published by Universitas Negeri Yogyakarta
ISSN : -     EISSN : 25993186     DOI : 10.21831
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Materials Science & Nanotechnology
Articles are welcome that deal with theoretical analysis, meta-anaysis reviews, and result of research or empirical studies from all aspect of Chemistry and Environment. Reports on new methodologies and comprehensive assessments of existing ones, as well as applications to new types of problems are especially welcome. Experimental papers are expected to be brought into relation with theory, and theoretical papers should be connected to present or future experiments. Manuscripts that apply routine use or minor extensions or modifications of established and/or published experimental and theoretical methodologies are appropriate if they report novel results for an important problem of high interest and/or if they provide significant new insights.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "Vol 3, No 2 (2020): DECEMBER 2020" : 6 Documents clear
The Optimazion of Bioethanol Production from Rice Husk using Simultanous Saccharification and Fermentation Methods Yuliana Wanda Puspitasari; Senam Senam
Indonesian Journal of Chemistry and Environment Vol 3, No 2 (2020): DECEMBER 2020
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (433.396 KB) | DOI: 10.21831/ijce.v3i2.43511

Abstract

The optimum condition of bioethanol production was studied by determining NaOH concentration, leaving time, and bioethanol content. The research started with delignification reaction using NaOH (alkaline pre-treatment), continued by saccharification process with Aspergillus niger and fermentation process with Saccharomyces cerevisiae. The resulted bioethanol was purified using destilation process and characterized with Gas Chromatography (GC). The result showed that optimum NaOH concentration was 3%, the leaving time optimum at 105 minutes, and the bioethanol content was 10.9966%.
The Decreasing of Copper (Cu) and Lead (Pb) Concentration in Electroplationg Liquid Waste with Coconut Coir Adsorbent Sanita Tyas Safitri; Susila Kristianingrum
Indonesian Journal of Chemistry and Environment Vol 3, No 2 (2020): DECEMBER 2020
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (487.025 KB) | DOI: 10.21831/ijce.v3i2.43507

Abstract

The study about determining the characteristics, optimize of mass and adsorption efficiency of Cu and Pb metal ions in electroplating waste on each coconut coir adsorbent have been done as an alternative to commercial activated charcoal. The adsorption process is carried out by the batch method. Analysis of metal content was carried out using AAS instrument and SEM-EDX to determine the morphology and components of coconut coir adsorbent. The results of the characteristics of the coconut coir adsorbent meet SNI 06-3730-1995 for volatile substances and carbon subtances, meanwhile the commercial activated charcoal have not meet SNI 06-3730-1995 for the content of volatile substances, ash content, carbon subtances and absorption capacity of I2 . The characteristics with the morphology of the surface of the coconut coir adsorbent before and after adsorption has less uniform particle size and has a round pore with a large cavity like a honeycomb. The optimize mass of coconut coir adsorbent for adsorption of Cu and Pb metal ions is 0.9 grams. The efficiency and capacity adsorption of Cu and Pb metal ions using coconut coir adsorbent on 50 mL electroplating waste were 8.39% and 34.38%, respectively also has 11 mg/g and 0.026667 mg/g. The surface component of coconut coir adsorbent before adsorption contain Pb metal had a mass% of 0.4%, while after adsorption there was a metal content of Cu which had a mass% of 0.9% and Pb metal had a mass% of 4.5%.
The Influence of Al3+ Metal Ion in AlCl3 Compound On α- Amylase Enzyme Activity Choirul Chasanah; Das Salirawati
Indonesian Journal of Chemistry and Environment Vol 3, No 2 (2020): DECEMBER 2020
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (493.934 KB) | DOI: 10.21831/ijce.v3i2.43512

Abstract

The influence of  Al3+ metal ion in  AlCl3 towards α-amylase enzyme activity have been studied. The activity of the α-amylase enzyme on potato starch substrate was determined using the DNS method (3,5-dinitrosalicylic acid) at optimum conditions. The data analysis was conducted in a descriptive qualitative manner. The results obtained that α-amylase enzyme activity with potato starch substrate was optimum at  20 mg/mL with pH 7.2, incubation temperature 37˚C, incubation time 15 minutes, and enzyme concentration of 40 mg/mL with an average enzyme activity value of 0.0079 mg/mL/minute at 37˚C. However, after the addition of Al3+ metal ion, the average value of enzyme activity decreased. These means that empirically Al3+ metal ion has a tendency to be inhibitory to the α-amylase enzyme activity on potato starch substrates.
Antioxidant Activity Testing of Extract Kweni Peel (Mangifera odorata Griff) Yolanda Dwi Lestari; Suci Permatasari; Ade Oktasari
Indonesian Journal of Chemistry and Environment Vol 3, No 2 (2020): DECEMBER 2020
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (685.361 KB) | DOI: 10.21831/ijce.v3i2.43508

Abstract

This research aims to test the antioxidant activity of extract kweni peel (Mangifera odoratta Griff). The antioxidant testing was performed by maceration using the solvents of n-hexane and ethanol 96% after that it was fractioned using ethyl acetate solvent. The phytochemical tests yield positive results from ethyl acetate extract were flavonoids and tannins. The antioxidant testing was carried out using the DPPH method (2,2, diphenyl-1-picrylhydrazyl) based on the inhibition concentration test parameters (IC50). The result showed that the antioxidant activity (IC50) found to be 169.43 µg/mL which was classified as moderate antioxidant activity intensity. Therefore, it can be concluded that the extract of kweni peel (Mangifera odoratta Griff) has potential antioxidant activity that could be used as an inhibitor of free radicals.
Optimization of Energy and Time Variations for Synthesis of N doped TiO2 Nanotube using Microwave-Asssisted Hydrothermal Method Cindy Candrika Anugrahayu; Cahyorini Kusumawardani
Indonesian Journal of Chemistry and Environment Vol 3, No 2 (2020): DECEMBER 2020
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (531.739 KB) | DOI: 10.21831/ijce.v3i2.43509

Abstract

This study aimed to determine the effect of energy and time hydrothermal microwave time variations on the crystal structure and N-TiO2 nanotube photocatalytic activity. The synthesis of N-TiO2 nanotube was performed with the hydrothermal microwave method. The N-TiO2 preparationwas carried out by dissolving ethylenediamine precursor in 80 ml of 96% ethanol and 3 ml TTIP which was reacted at 70 °C for 4 hours. The obtained N-TiO2 was formed into nanotubes used the hydrotermal microwave method in low temperature (180W), medium temperature (360 W), and high temperature (720 W) with time variations of 30 minutes, 1 hour, and 2 hours. The microwave hydrothermal process in this study used 10 M NaOH to form a tubular structure and 0.5 M HCl as an ion exchange. The characterization analysis performed by X-Ray Diffraction, UV-Diffuse Reflectance Spectroscopy, and blue methylene degradation. The results of this study indicate that the variations of time and energy of the microwave hydrothermal method affect the crystal structure of the N-TiO2 nanotubes. The nanotubes structure has been formed at a variety of low energy 2 hours, medium energy 0.5 hours, 1 hour and 2 hours, and high energy 2 hours. Energy and time variations of hydrothermal microwave affect the photocatalytic activity of N-TiO2 nanotubes showed second-order kinetics. The best percentage of degradation produced in the T2 variation is the photocatalyst reaction of 71.89% and the adsorbs reaction of 64.81%.
Utilization of Coffee Waste as Active Charcoal For Purification of Waste Cooking Oil Salma Husna Sukmawati; Sunarto Sunarto
Indonesian Journal of Chemistry and Environment Vol 3, No 2 (2020): DECEMBER 2020
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (635.979 KB) | DOI: 10.21831/ijce.v3i2.43510

Abstract

This research aims to find the comparison of the chemical-physical characters of coffee waste activated charcoal using ZnCl2 with HCl, to calculate the highest adsorption efficiency, and to determine the quality of waste cooking oil after purification. The washed and dried of coffee waste are carbonized by the temperature 700oC and chemically activated using ZnCl2 5% and HCl 5%. The adsorption process used by batch system. The object of this research is the character of activated charcoal from coffee waste such as water content, ash content, iodine adsorption capacity of activated charcoal, peroxide number and free fatty acid (FFA) number of waste cooking oil before and after purification. Morphological analysis of activated charcoal was carried out using Scanning Electron Microscope (SEM). Analysis of the number of peroxide and FFA were carried out respectively using the titration method. The results of the characterization of activated charcoal showed that the activated charcoal with ZnCl2 5% activator had a water content of 6.55%, an ash content of 6.046%, adsorption of iodine 1039.5 mg/g, and had clean and wide pores. Activated charcoal with HCl 5% activator has a water content of 7.25%, an ash content of 7.55%, and 1008 mg/g of iodine adsorption. The highest adsorption efficiency of activated charcoal was 49.9749% in reducing the peroxide number and 50.1113% for reducing FFA, these results were obtained at 3 hours contact time with 3 g adsorbent mass. The peroxide number in the waste cooking oil that has been purified has not qualitified the standard SNI 01-3741-2013, but the FFA at 3 hours contact time with 3 g adsorbent mass qualitified the standard

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