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Rahmat Basuki
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INDONESIA
Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.)
Published by Indonesian Scholar Society
ISSN : 2830778X     EISSN : 28307658     DOI : https://doi.org/10.55749/ijcs.v1i1
Core Subject : Science,
Chemistry
Indonesian Journal of Chemical Studies (IJCS) is a peer-reviewed, open-access journal that publishes original research articles, review articles, as well as short communication in all areas of basic and applied chemistry. IJCS was managed & published by the Indonesian Scholar Society. This journal is published 2 times a year, namely every June and December. IJCS covers the following topics, but is not limited to: Organic and Inorganic Chemistry; Physical and Theoretical Chemistry; Analytical and Electroanalytical Chemistry; Materials and Polymer Chemistry; Supramolecular Chemistry; Organometallic Chemistry; Coordination Chemistry; Biomolecular Chemistry; Natural Products and Medicinal Chemistry; Electrochemistry; Environmental Chemistry; Propellant Chemistry; and Chemistry for Defense.
Arjuna Subject : Kimia(semua kategori) - Inorganic Chemistry
Articles 46 Documents
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A Technical Study on the Effect of Hydrothermal and Dry Heat Shrinkage of Different Shoe-Upper Leathers Used in Pakistan Solangi, Barkat Ali; Zehra, Beena; Nawaz, Hafiz Rub; Nadeem, Uzma; Pervez, Mohammad Kashif; Zeeshan, Mohammad
Indonesian Journal of Chemical Studies Vol. 2 No. 1 (2023): Indones. J. Chem. Stud., June 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i1.10

Abstract

The shrinkage of leather becomes a problem when leather is used in the form of leather shoes or other products and is heated at a high temperature. This technical study addressed shrinkage occurring in most leather shoes used in Pakistan during the shoe manufacturing process.  The chemical testing results revealed fat content (4.0-4.5%), chromic oxide (2.3-2.5%), ash content (1.3-1.6%), and pH (3.5-3.7) under significant limits. The effects of hydrothermal and dry heat shrinkage were investigated in selected shoe-upper leathers. The leather samples showed (18-41%) shrinkage in all 03 samples. The results revealed that an extensive change in various physical tests, such as tensile strength, % elongation, tear strength, had been found with heat induction. The temperature and time of heat contact significantly affect the destruction of bonding in shoe upper leather after being converted into shoes.
Chemical Regeneration of Activated Carbon After Adsorption of Ni(II) Ions Chong, Kian Wei; Cho, Kin Hau
Indonesian Journal of Chemical Studies Vol. 2 No. 1 (2023): Indones. J. Chem. Stud., June 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i1.20

Abstract

The chemical regeneration of activated carbon (AC) has recently received greater attention because it allows high-cost granular AC and AC fibers to be reused with less effort and energy. The chemical regeneration of activated carbon after Ni(II) ions adsorption was investigated in this study. Various desorbing solutions were used to recover adsorbed Ni(II) ions to AC. The concentration of the most effective desorbing solution was optimized. The adsorption efficiency of the regenerated AC using merely an acidic desorbing solution was reduced. Therefore, additional treatment after desorption using an acidic desorbing solution was carried out using sodium hydroxide solution. The optimum concentration of sodium hydroxide was determined. Using 3% HCl and H2SO4 as desorbing solutions, more than 80% of Ni(II) ions could be desorbed from AC. However, the readsorption efficiency of Ni(II) ions by AC was reduced to less than 50% after the first regeneration. By treating the regenerated AC from the acidic desorbing solution with 1 % NaOH, the efficiencies in the Ni(II) ions adsorption and desorption were fully recovered to almost 100%.
Magnetically Separable Humic Acid-Chitin Based Adsorbent as Pb(II) Uptake in Synthetic Wastewater Ngatijo; Marlinda, Lenny; Malikhah, Wukhoidatul; Ishartono, Bayu; Basuki, Rahmat
Indonesian Journal of Chemical Studies Vol. 2 No. 1 (2023): Indones. J. Chem. Stud., June 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i1.22

Abstract

Modification of humic acid (HA) from the peat soil of Jambi province, Indonesia with chitin and magnetite to form Fe3O4/HA-chitin has been successfully carried out. The successful synthesis was identified from characterization with functional group analysis, crystal analysis, magnetic strength measurement, and morphological and elemental analysis. The application of Fe3O4/HA-chitin to adsorb Pb(II) ion was analyzed using the Lagergren, Ho, Santosa, and RBS kinetics models (kinetics study) and the Langmuir, Freundlich, Dubinin-Radushkevich (DR), and Temkin isotherm model (isotherm study). The kinetics study followed the Ho model (pseudo-second order) with R2 and kHo of 0.9997 and 10264.59 g/mol min, respectively. The results of the data applicable to the Freundlich model showed that several sites were capable of multilayer adsorption (B) with a large enough adsorption capacity of 929.19 mg/g (about 28 times higher than the monolayer adsorption of Langmuir data). However, the outermost layer had a feeble adsorption energy of 0.51 kJ/mol, as measured by Temkin's adsorption energy. In the layer between the first layer (Langmuir) and the outermost layer (Freundlich), the DR isotherm was measured at a capacity of 104.87 mg/g (qD, the 3rd layer of the first layer) the adsorption energy was measured at 12.91 kJ/mol. A cross-study on the prediction of adsorption energy using the Santosa and RBS kinetics models showed that the RBS model had an adsorption energy value (26.45 kJ/mol) that was closer to the adsorption energy value of the Langmuir isotherm (27.55 kJ/mol).
Organic Fertilizer from Amino Acid and Eco-Enzyme Combinations for Repairing Plant Metabolism Satrio, Galih; Hanum Hasibuan, Anggi Khairina; Azzida, Putry Wanda
Indonesian Journal of Chemical Studies Vol. 2 No. 1 (2023): Indones. J. Chem. Stud., June 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i1.28

Abstract

At Gadog Fresh, eco-enzymes and amino acids are the revolutionary combination of liquid organic fertilizers used to attain a zero-waste lifestyle. This research determined the effect of various liquid organic fertilizers on improving the metabolism of leek plants. This research was conducted at the Gadog Farm. The method applied liquid organic fertilizers from eco-enzymes and chicken eggs in the treatment labeled K, P1, P2, and P3 with various doses of 0.0; 2.5; 5.0; and 7.5 mL/L into spring onions. It was applied as much as 250 mL four times every seven days. The results obtained were plant height, namely 36.45; 47.63; 41.52; 42.62; stem diameter 7.30; 8.92; 10.42; 9.42; and dry weight percent 7.07; 7.38; 9.05; 7.09. The increase in height, diameter, and dry weight showed that liquid organic fertilizer applications improved the metabolism of leek plants. However, variations in the concentration of liquid organic fertilizer did not significantly affect all research points.
Hydrothermal Method to Synthesize Nanomagnetite by Water Extract of Averrhoa bilimbi : Effect of Time and Reactor Size Arif, Zulhan; Ismawati, Iis; Hikmah, Anisa Nurul; Saprudin, Deden
Indonesian Journal of Chemical Studies Vol. 2 No. 1 (2023): Indones. J. Chem. Stud., June 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i1.29

Abstract

Nanomagnetite was synthesized using water extract of bilimbi (Averrhoa bilimbi). The high citric acid content has the potential as a reducing agent in the synthesis of magnetite using the hydrothermal method. The synthesis was conducted using different sizes of hydrothermal reactors, 50, 150, and 1700 mL. The results showed that a reactor with a volume of 150 mL and a synthesis time of 12 h was the best condition for synthesis. The results obtained from X-ray diffraction analysis showed that in the best conditions, the crystallinity level was 74.4%, the ratio of product to volume was 3.7×10–2 g/mL, the Fe content in magnetite was 22.0%, the Fe content in the remaining liquid was 0.02%, the Fe ratio was 96.9%, and the ammonium content in the solution was 1.24% w/v. The best conditions were 150 mL reactor and 12 hours synthesis.
Analysis of The Impact of Handwashing with Soap Policy on Water Quality in Public Facilities: A Case Study in Palangka Raya, Indonesia Achmad Imam Santoso; Azhari, Muh.; Putro, Dhymas Sulistyono
Indonesian Journal of Chemical Studies Vol. 2 No. 2 (2023): Indones. J. Chem. Stud., December 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i2.27

Abstract

Coronavirus disease 2019 (Covid-19) has changed lifestyles. One of the new habits practiced by the community is washing hands. The government had issued a policy stipulated in the decree of the Minister of Health of the Republic of Indonesia number HK.01.07/Menkes/382/2020 concerning Health Protocols for Communities in Public Places and Facilities in the Context of Prevention and Control of Covid-19. Washing hands with soap is an effective step to break the chain of transmission of Covid-19. This research obtained samples of handwashing disposal and surface water at three public facilities in Palangka Raya city, i.e. G. Obos XX market, Pasar Besar, and KPD Supermarket that examined for the parameter of BOD, COD, TSS, and detergent content in the area. The result was the handwashing disposal and the surface water of three public facilities had BOD, COD, TSS, and detergent levels exceeding the surface water quality standard. Disposal of handwashing with soap waste directly into surface water causes a decrease in surface water quality
Synthesis and Characterization of Isopropylidene Glycerol Acetate and Isopropylidene Glycerol Propanoate Compounds Ridlo, Achmad; Choirunnisa, Lutfia; Rahmawati, Fani; Irunsah, Aslan; Ishartono, Bayu
Indonesian Journal of Chemical Studies Vol. 2 No. 2 (2023): Indones. J. Chem. Stud., December 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i2.30

Abstract

Isopropylidene Glycerol Acetate (IGA) and Isopropylidene Glycerol Propanoate (IGP) as ester compounds using acetic and propanoic acids have been synthesized, characterized, and studied for their antibacterial properties. The IGA was synthesized from ethyl acetate (EtOAc) and 1,2-O-isopropyliden glycerol (IPG) with a mole ratio of 1:8 through a transesterification reaction. Meanwhile, the IGP was synthesized using ethyl propanoate (EP) with the same ratio and method as IGA. All materials in this study were identified using FT-IR, GC-MS, 1H-NMR, and 13C-NMR. The characterization results indicated that the compounds of EP, IPG, IGA, and IGP had been successfully formed and identified. It was also revealed that the compounds of EP, IPG, IGA, and IGP were successfully synthesized with yields of 37.72, 27.78, 70.11, and 63.83%, respectively. The antibacterial activity test revealed that neither IGA nor IGP inhibited the growth of Staphylococcus aureus or Escherichia coli at concentrations of 62.5; 125; 250; 500; and 1000 ppm. Therefore, it was asserted that ester compounds synthesized with short-chain carboxylic acids, such as propanoic and acetic acids, lacked antibacterial properties.
Comparative Analysis of Electronic Structures Calculations: A Simple Test Case Set for Kohn-Sham Density Functional Theory and Hartree-Fock Methods Apriliyanto, Yusuf Bramastya; Nurrosyid, Naufan
Indonesian Journal of Chemical Studies Vol. 2 No. 2 (2023): Indones. J. Chem. Stud., December 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i2.33

Abstract

A comparative analysis on the performance of Kohn-Sham density functional theory (KS-DFT) and Hartree-Fock (HF) methods to obtain reliable energy and electronic properties has been performed in this study using a simple test case. It is crucial to re-emphasize the key differences between these methods to address common conceptual difficulties that occur among freshmen studying basic computational chemistry. The results suggested that the eigenvalue theorem in determining ionization potential could be well implemented in the HF but not in the KS-DFT method. The total energy difference between ionized and non-ionized species was an appropriate procedure to calculate the first ionization potential within the KS-DFT method. The HOMO-LUMO gap in the HF was larger than the gaps obtained from the KS-DFT method. Among all of the performed calculation methods, the B3LYP hybrid functional provided better total energy where the eigenvalues were located between the HF and the LDA/GGA functionals.
Chemicals Analysis of Drilled Ground Waters in Moa Island, Maluku, Indonesia Putra, M. Sulthon Nurharmansyah; Hermana, Nabila Swarna Puspa; Sumarno, Ari Pitoyo
Indonesian Journal of Chemical Studies Vol. 2 No. 2 (2023): Indones. J. Chem. Stud., December 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i2.36

Abstract

Moa Island is one of the remote Indonesian Islands that face the difficulty in accessing clean water, especially during the dry season. One way to get clean water is by drilling for groundwater. The drilled groundwater in Kaiwatu Village on Moa Island, Southwest Maluku Regency, Maluku Province, was analyzed for its content to obtain primary data. Primary data related to the quality of drilled groundwater sources includes chemical, physical, and microbiological parameters. The results of chemical parameters obtained from the test results were <0.01 mg/L fluoride, total chromium, nitrite, nitrate, iron, manganese, zinc, cyanide, lead, <0,001 mg/L cadmium, 17.9 mg/L hardness, sulfate 147.55 mg/L, pH 7.50, and organic substances 2.8 mg/L.  The physical parameter analysis showed a turbidity level of 3.71 NTU, a temperature of 26.8 °C, and a color of 5 TCU. The microbiological parameters obtained by the analysis were 0/100 mL. Primary data was then compared with secondary data, namely environmental health quality standards and air health requirements from Minister of Health Regulation No. 32 of 2017 for chemical and physical parameters, as well as water quality requirements and monitoring from Minister of Health Regulation 416/MENKES/IX/1990 for microbiological parameters. The analysis results using a comparison of primary and secondary data showed that all parameters contained in the primary data had values below the safe limits set by the requirements in the secondary data.
Spray Gel Formulation of Ethanolic Extract Senduduk Leaves (Melastoma malabatricum) Against Antioxidant Activity, SPF, and Chemical Components Analysis with LC-MS/MS Yulion, Rizky; Andriani, Lili; Asadi, Henityo Agung; 'Aliyah, Siti Hamidatul; Mariska, Ruri Putri; Perawati, Santi; Hasanah, Rifdatul
Indonesian Journal of Chemical Studies Vol. 2 No. 2 (2023): Indones. J. Chem. Stud., December 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i2.37

Abstract

Senduduk leave (Melastoma malabathricum) is one of the species in the melastomaceae family that has long been used by local Indonesian people, one of which is the Suku Anak Dalam (SAD) for various needs and also as traditional medicine. The study aimed to examine the antioxidant activity of ethanolic extract of senduduk leaves. The extract was then formulated into spray gel preparations as UV-B sunscreen. The research method used was starting from sampling, determination, making samples, soxhlet, determining the IC50 value, spray gel preparation formulation, formulation stability test, measuring sun protection factor (SPF) values, and identifying extract chemical components with the LC-MS/MS instrument. The results was that the ethanolic extract of senduduk leaves had an IC50 value of 49.73 μg/mL with the best SPF value at a concentration of 70 ppm, which is 19.98. Spray gel preparations with a concentration of 70 ppm have an IC50 value of 44.22 μg/mL, an SPF value of 24.96, and a potent antioxidant intensity. So, extract spray gel can potentially have activity as antioxidants and can be used as UV-B sunscreen. The compounds identified include quercetin, quercitrin, DEET, n-boc-3-pyrrolidinone, medicarpine, taxinine, and other compounds. The ethanol extract of the soxhlet results showed more promising results for further tests of in-vitro, in-vivo, and in-silico bioactivity studies.

Page 2 of 5 | Total Record : 46

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