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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 71 Documents
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Adsorption of Cr on Liquid Waste of Tannery Industry using Banana Peel Charcoal in various pH and Time Activation A. D. Atmasari; F. Amaliya; L. Puspitasari
Indonesian Journal of Chemistry and Environment Vol 2, No 1 (2019): June 2019
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (430.253 KB) | DOI: 10.21831/ijce.v2i1.30292

Abstract

The purpose of the research is to determine the effect of activation time of banana peel charcoal on the adsorption capacity of Cr metal's tannery industry. Banana peel charcoal is made by carbonization process followed by activation using HCl solution with varying time. The activated charcoal with optimum activation time is used to determine the optimum pH of tannery waste on adsorption Cr metal. Banana peel as much as 600 grams then carbonized can form 42 grams of banana peel charcoal. The concentration of Cr metal initial that contained in tannery waste was 292.1 ppm. The optimum activation time is 1 hour, with decreasing Cr metal as much as 141.87 ppm using 1 gram of banana peel activated charcoal. While the pH variation of waste does not provide a significant difference.
Hydration Structures and Dynamics of Ga3+ Ion Based on Molecular Mechanics Molecular Dynamics Simulation (Classical DM) Muhammad Syaekhul Anam; S. Suwardi
Indonesian Journal of Chemistry and Environment Vol 4, No 2 (2021): DECEMBER 2021
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (589.876 KB) | DOI: 10.21831/ijoce.v4i2.48401

Abstract

The structure and hydration dynamics of Ga3+ ion have been studied using classical Molecular Dynamics (MD) simulations. The data collection procedure includes determining the best base set, constructing 2-body and 3-body potential equations, classical molecular dynamics simulations based on 2-body potentials, classical molecular dynamics simulations based on 2-body + 3 potential-body. The trajectory file data analysis was done to obtain structural properties parameters such as RDF, CND, ADF, and dynamic properties, namely the movement of H2O ligands between hydrations shells.     The results of the research indicated that the hydration complex structure of Ga(H2O)83+ and Ga(H2O)63+ was observed in molecular dynamics simulations (MM-2 body) and (MM-2 body + 3-body), respectively. The movement of H2O ligands occurs between the first and second shell or vice versa in the MD simulation of MM-2 bodies but does not occur in MD simulations of (MM-2 bodies + MM-3 bodies). Therefore, the water ligands in the first hydrated shell are stable. 
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
The Effect of Activators againts the Ability of Active Charcoal from Nila Fish (Oreochromis niloticus) to Adsorp Cd(II) and Pb(II) Ions M. T. Santi; I. Banihabib; M. Isnaningrum; I. B. Miranda
Indonesian Journal of Chemistry and Environment Vol 2, No 2 (2019): December 2019
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (502.072 KB) | DOI: 10.21831/ijce.v2i2.38192

Abstract

The purpose of this research is to how to make the active charcoal of Nila fishbone and to know effect of the variety activators against the ability of charcoal from nila fishbone waste in absorbing Cd(II) and Pb(II) ions. This research included in the experimental research. Active charcoal making process through 5 stages, namely: sampling, sample processing, the process of carbonation, the activator, and the process of neutralization. Sampling (Nila fishbone) in the restaurant, sample processing in the form of a fishbone drying in the sunshine, the process of carbonation by injecting bone for the furnace and sifted using a mess. The process of with activator HNO3 and HCl, also neutralization by making active charcoal to a neutral pH. Then, specify a contact time of 30, 60, and 90 minutes. The filtrate is further tested by Atomic Absorption Spectrophotometer (AAS) tool to know the adsorption of lead and cadmium ions. The results showed effect of HCl activator on Cd2+ and Pb2+ ions is more effective than HNO3 activator.
Analysis of Total Reducing Sugar Content, Acidity Value, and Hydroxymethylfurfural (HMF) Content of Various Honey Types Agrib Nur Ayubi
Indonesian Journal of Chemistry and Environment Vol 1, No 1 (2017): December 2017
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1300.001 KB) | DOI: 10.21831/ijce.v1i1.20786

Abstract

The aims of this research are to determine the total reducing sugar content, acidity value, and hydroxymethylfurfural (HMF) content of various honey types in Special Region of Yogyakarta and Central Java. Those types sample of honey are sengon, randu, kelengkeng, rambutan, and kopi honey from several places in Yogyakarta and Central Java. This research using analytical method, there are iodometry titration, acid-base titration, and UV-Vis spectrophotometry. The result of total reducing sugar content from sengon honey 74.40%, randu honey 61.42%, kelengkeng honey 62.07%, rambutan honey 88.14%, and kopi honey 87.04%. Acidity value of sengon honey 71.33 mL/Kg, randu honey 116.67 mL/Kg, kelengkeng honey 41.33 mL/Kg, rambutan honey 32.00 mL/Kg, and kopi honey 70.00 mL/Kg. HMF content of sengon honey 14.7 mg/Kg, randu honey 39.7 mg/Kg, kelengkeng honey 45.2 mg/Kg, rambutan honey 47.5 mg/Kg, and kopi honey 38.8 mg/Kg. In spite of the result of this analysis is more than the number of Indonesian National Standard of honey, those honeys are still good and doesn’t mean there are forbidden to consume it.
The Effect of the Hydrothermal Time and Temperature in the Synthesis to the Properties of Nitrogen-doped TiO2 Misbah Rijal Ulhaq; Cahyorini Kusumawardani
Indonesian Journal of Chemistry and Environment Vol 5, No 1 (2022): JUNE 2022
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v5i1.51822

Abstract

Nitrogen-doped TiO2 (N-TiO2) has been synthesized through hydrothermal method by reacting the ethanolic solution of ethylene diamine with titanium precursor. The acidic contition was adjusted by the addition of glacial acetic acid. The hydrolysis process was done using hydrothermal process at various hydrothermal time and temperatures. The resulting materials were characterised FTIR, XRD, and Diffuse Refflectance UV/VIS Spectroscopy. The result showed that the increase of hydrothermal temperature lead to increase of particle size, but decreasing the band gap energy. However, the longer the hydrothermal time provided the decrease of particle size with no sugnificantly effect to the band gap energy.
Preparation of Cobalt-Silica Dioxide (CoxSiO2) Catalyst through Impregnation Method Isthifaul Mawaddah; M. Pranjoto Utomo
Indonesian Journal of Chemistry and Environment Vol 5, No 1 (2022): JUNE 2022
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v5i1.51823

Abstract

The CoxSiO2 catalyst have been synthesized by reacting amount of cobalt nitrate and silica dioxide through impregnation method with vatiation on x= 0, 0.025, 0.05, and 0.1. The resulted materials were characterized using UV-Vis DRS, FT-IR, XRD, and SEM-EDX instruments. The XRD results showed that Co-SiO2 catalyst have peaks at 2θ of 21.5º (for x = 0.025), 14.52º (for x = 0.05), and 21.58º (for x = 0.1). The CoxSiO2 catalysts were amorphous with average size of 4-11 nm and the band gap were at around of 1-3 eV.
Methyl Orange Dye Removal through Adsorption using TiO2 modified Montmorillonite Granule Dewi Yuliana; Erfan Priyambodo
Indonesian Journal of Chemistry and Environment Vol 5, No 1 (2022): JUNE 2022
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v5i1.51824

Abstract

This research was conducted to determine the characteristics of TiO2 modified montmorillonite granule and to determine the effectiveness of its filtration against methyl orange dye. Montmorillonite granule particles were made through a pressing process and continued with sintering at 900oC. The granules obtained were coated with TiO2 photocatalyst by the deep coating method. The montmorillonite granules were characterized using SEM-EDX and the methyl orange dye adsorption process was carried out using the column method. The SEM analysis showed that the granules is porous materials and the EDX confirm the increasing of TiO2 content in montmorillonite before and after being coated with TiO2 from 0.50% to 22.66%. The best adsorption effectiveness of methyl orange was 96.6% at the flow rate of 0.0083 L/hour, which occurred in the use of TiO2 modified montmorillonite granule.
Preliminary Study of Profenofos and Difenoconazole Pesticide Residue in Soil and Citrus Fruits from Citrus Farming in Serai Village Kintamani Bangli I Wayan Muderawan; Luh Mitha Priyanka; I Nengah Suparta
Indonesian Journal of Chemistry and Environment Vol 5, No 1 (2022): JUNE 2022
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v5i1.49347

Abstract

The intensively use of both profenofos and difenoconazole pesticides in Citrus farming in Serai Village Kintamani Bangli may remain as residue in the soil and citrus fruits. This study was performed in order to determine the level of pesticide residues in the soil and the citrus fruits from Citrus farming in Bangli. The pesticide residue levels in the soil and citrus fruit were performed by using solid-liquid extraction (SLE) and detected by high performance liquid chromatography (HPLC). The result shows that the pesticide residue levels in soil, citrus peel and citrus flesh are 0.057±0.002, 0.112±0.013 and 0 mg/L for profenofos and 0.069±0.002, 0.180±0.013 and 0 mg/L for difenoconazole. The results indicated that the soil and citrus peel from citrus farming area in Serai Village Bangli Regency contained both pesticide residues but not the citrus flesh.
Fatliquor Development from Hemp Oil to Produce High Quality Natural Finished Leather Sarwat Jahan Mahboob
Indonesian Journal of Chemistry and Environment Vol 5, No 1 (2022): JUNE 2022
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v5i1.51418

Abstract

Fatliquors are very important in the manufacture of leather. Leather treated with fatliquor become more flexible and softer by the separation of leather fibers in the wet state so that they do not stick too much during drying, also the physical properties, such as tensile strength, softness, tear strength and stability of the leather become influenced simultaneously. The step of fatliquoring is carried out during leather processing operation after tanning. Variety of fatliquors is synthesized so far from various vegetable oils. In this study, for the first time, fat-liquor, named as, “Hempfat” is synthesized from oil extracted from hemp seeds. As hemp oil consists of high amount of omega-6, omega-3 fatty acids possessing antioxidant activities, so accepted as beneficial to health for public, also possess high kinetic stability and increased protective effect during increase or decrease of temperature. On high temperatures, trans-fatty acids are not formed. So the developed fatliquor, “Hempfat” and the leather developed from it were evaluated on physical and chemical grounds, both found to possess the excellent properties of a fatliquor as leather fatliquoring agent in making good quality finished natural leather.

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