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Moondra Zubir
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INDONESIA
Indonesian Journal of Chemical Science and Technology
Published by Universitas Negeri Medan
ISSN : 26221349     EISSN : 26224968     DOI : -
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
Jurnal ini mempublikasikan artikel di bidang Kimia yang meliputi penelitian dasar dan terapan. Bentuk Publikasi di Indonesian Journal of Chemical Science and Technology : * Artikel * Review (berdasarkan permintaan Dewan Redaksi) * Communication (berdasarkan permintaan Dewan Redaksi)
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 179 Documents
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Synthesis of Zeolite from Rice Husk Ash Through Hydrothermal Process in Alkaline Condition Jahro, Iis Siti; Nursanni, Banu; Nugraha, Asep Wahyu; Juwitaningsih, Tita; Cindy, Cindy; Amalia, Meisya
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 7, No 2 (2024): JULY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i2.62257

Abstract

People consider rice husks as agricultural waste. In Deliserdang Regency, in one year's period, 12,600 tons of ash are collected from the burning of around 70,000 tons of rice husk. The synthesis of zeolite from ash of rice husks was carried out by starting process of forming sodium silicate and aluminate compounds through the reaction with Al2O3 and NaOH in water on the room temperature for 10 hours. The results of reaction is refluxed at 70 C for 3 hours. After being stored for around 12 hours at room temperature, the reflux process was continued at 120 C for 8 hours. Infrared spectra of zeolite show an infrared absorption band in the area of around 440; 606; 745; and 1007 cm-1 which is the typical infrared absorption of zeolite X. This is supported by the XRD diffractogram with the diffraction peaks at 2 degree of 12.34; 17.51; 21.53; 27.90; 28.50 and 33.22 degrees.
Synthesis and Characterization of Activated Carbon/Alginate-Fe Composites as Slow Release Fertilizer Panjaitan, Teguh Hidayat; Muchtar, Zainuddin; Rahmah, Siti; Zubir, Moondra; Pulungan, Ahmad Shafwan; Selly, Rini; Faradilla, Putri
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 7, No 1 (2024): JANUARY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i1.62302

Abstract

Research on the slow release kinetics of Fe(III) ions from Activated Carbon/Alginate-Fe(III) composites or abbreviated as K/A-Fe(III) has been carried out. The aim of this research was to synthesize K/A-Fe(III) composite as a material that has the potential to become a slow release micronutrient fertilizer and to study the kinetics of slow release of Fe(III) ions from the composite. The K/A-Fe(III) composite was synthesized by mixing alginate suspension and activated carbon (alginate: activated carbon weight ratio = 1:3 and 3:1) until homogeneous. Composite grains were characterized using Fourier Transformed Infrared (FTIR) spectroscopy, the kinetics of Fe(III) release from the three composite variations found that KAlg31 composite showed more absorption and release of Fe ions than KAlg13.
Adsorption of Linear Alkylbenzene Sulfonate (LAS) using Moringa oleifera Seeds Manurung, Tety Wahyuningih; Ningsih, Rima Oktavia; Irawati, Utami
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 7, No 2 (2024): JULY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i2.62253

Abstract

One of the main components in detergent is Linear Alkylbenzene Sulfonate (LAS), an anionic surfactant. In the aquatic environment, LAS has the potential to cause pollution and cannot be decomposed under anaerobic conditions (no air), so it is necessary to study processing methods that can reduce the concentration of LAS in the waters. In this research, a study of LAS adsorption by Moringa seeds was carried out. The parameters studied were the influence of contact time and solution pH. A study on the isothermic adsorption of LAS on Moringa seeds using the Freundlich and Langmuir approach was also carried out. The concentration of LAS was determined by the Methylene Blue Active Surfactant (MBAS) method using a UV-Vis spectrophotometer. The results showed that adsorption reached equilibrium after 90 minutes. A pH value of 5 is the optimum pH value for the adsorption of LAS by Moringa seeds. Using the Langmuir approach, the LAS adsorption capacity of Moringa seeds was calculated to be 400 mg/g.
Antioxidant activity of local Gompang Batu Plants (Lobelia nummularia Lam) in vitro DPPH Method Ester Basani Panggabean; Murniaty Simorangkir
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68702

Abstract

Free radicals are reactive atoms or molecules because they contain unpaired electrons that easily attack body structures, causing various diseases such as cancer, liver, heart and other degenerative diseases. Antioxidants are compounds or molecules that can reduce free radicals. Natural antioxidants are needed to reduce the effects of using synthetic antioxidants. The local plant gompang batu (Lobelia nummularia Lam) is found in Ruhut Bosi Village, Pangaribuan District and has been used by the community as a traditional medicine. This study aims to determine the content of secondary metabolites and antioxidant activity of ethanol extract of gompang batu in vitro using the DPPH (2,2 diphenyl-1-picrylhydrazyl) method. The results of the phytochemical screening test of the gompang batu plant contain secondary metabolites of flavonoids, alkaloids, steroids/terpenoids and saponins. The results of the antioxidant activity test of the ethanol extract of gompang batu obtained an IC50 value of 135,095 ppm (moderate category) and an IC50 value of vitamin C (as a positive control) of 39,390 ppm.
Toxicity of Gompang Batu Plant Extract (Lobelia nummularia Lam) with BSLT (Brine Shrimp Lethality Test) Method as Raw Material for Medicine Agnes Normawati Silaban; Murniaty Simorangkir
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68704

Abstract

Gompang Batu is a traditional medicinal plant found in Pangaribuan, North Tapanuli, Sumatra, Indonesia. Identification confirmed that gompang batu is Lobelia nummularia Lam from the Campanulaceae family. This study aims to determine the toxicity and phytochemical content of three types of gompang batu extracts. The Brine Shrimp Lethality Test (BSLT) method.was used for toxicity testing. Extraction was conducted through maceration using n-hexane, ethyl acetate, and ethanol solvents. LC50 values were 18.05 µg/mL for ethanol extract (very toxic), 27.59 µg/mL for ethyl acetate extract (very toxic), and 51.34 µg/mL for n-hexane extract (toxic). Phytochemical analysis showed that the ethanol extract contains abundant alkaloids, flavonoids, saponins, terpenoids and tannins. Ethyl acetate extract contains alkaloids, steroids, flavonoids, saponins, and tannins moderate tannins. N-hexane extract contains steroids and a small amount tannins. L. nummularia extract is classified as toxic and show potential as a medicinal raw material.
Antibacterial Potential of Gompang Batu Plant Extract (Lobelia nummularia Lam) Against Skin Disorder-Causing Bacteria Syazwana Izni; Murniaty Simorangkir; Yesica Marcelina Romauli Sinaga
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68705

Abstract

Skin disorders are common health problems that are often caused by bacterial infections such asStaphylococcus epidermis and Propionibacterium acnes. This study aims to analyze the antibacterialpotential of n-hexane, ethyl acetate, and ethanol extracts of gompang batu (Lobelia nummularia Lam)plants against bacteria that cause skin disorders. Extraction was carried out by maceration withsolvents of varying polarity. Antibacterial tests were carried out using the disc diffusion andmicrodilution methods with six treatments (chloramphenicol, DMSO, 1.25%; 2.5%; 5% and 10%extract). The results showed that the ethanol extract with a concentration of 10% had the most effectiveantibacterial activity with an inhibition zone of 14.0 mm (P. acnes bacteria) and 13.8 mm (S. epidermisbacteria). The MIC value of the extract ranged from 156.25 to 625 µg/mL and the MBC value of allextracts> 2500 µg/mL indicated bactericidal properties. Gompang batu has the potential as a naturalantibacterial for skin infections. N-hexane extract contains steroids and tannins; ethyl acetate containsalkaloids, flavonoids, steroids and tannins; ethanol contains alkaloids, flavonoids, terpenoids and tannins.
Thermodynamic and Kinetic Study of the Reaction Mechanism of Acetylsalicylic Acid Formation Using Computational Chemistry Methods Julina Indah Gewa Sitompul; Roma Sinaga; Asep Wahyu Nugraha
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68706

Abstract

Acetylsalicylic acid or aspirin is one of the most widely used non-steroidal anti-inflammatory drugs (NSAIDs) in medicine because of its properties as an analgesic, antipyretic, and antiplatelet. This study aims to examine the thermodynamic and kinetic aspects of the reaction mechanism of aspirin formation from salicylic acid and acetic anhydride using a computational chemistry approach. The method used to determine energy is the computational chemistry method, the theory used is metode Restricted Hartree-Fock (RHF) with a basis set of 3-21G. The calculation results show the formation of energy (ΔE) of the reaction of -1.21 kJ/mol. The magnitude of the activation energy (Ea) from the computational chemistry calculation is 7.95 kJ/mol. The structure of the intermediate was also successfully identified and visualized, supporting a two-stage reaction mechanism with the presence of a transition state
Thermodynamic and Kinetic Study on the Reaction Mechanism of Paracetamol Formation from 4-Aminophenol Using Computational Chemistry Methods Roma Sinaga; Julina Indah Gewa Sitompul; Asep Wahyu Nugraha
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68707

Abstract

Paracetamol, also known as acetaminophen, is one of the most widely used drugs worldwide and is included in the WHO Essential Medicines List. The synthesis process of paracetamol is carried out through the acetylation reaction of 4-aminophenol with acetic anhydride, producing paracetamol and acetic acid as a by-product. This study aims to analyze the thermodynamic and kinetic aspects of the paracetamol formation reaction from 4-aminophenol using a computational chemistry approach. Calculations were performed using the Restricted Hartree-Fock (RHF) method with a 3-21G basis set implemented in the NWChem software, while molecular structure visualization was conducted using Jmol and Avogadro. The results show that the energy change (ΔE) is –25.0107 kJ/mol (exothermic). In addition, the activation energy (Ea) required to reach the transition state is recorded at 623.13 kJ/mol.
Effectiveness of Metanil Yellow Adsorption Using CTAB-Modified Activated Carbon from Areca Nut Husk (Areca catechu L.) Sri Rahayu; Ratna Sari Dewi
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68714

Abstract

This study investigates the adsorption efficiency of Metanil Yellow using activated carbon derived from areca nut husk (Areca catechu L.), which was chemically activated with KOH and modified with CTAB surfactant. The adsorbent was characterized using FTIR and UV-Vis spectroscopy to identify functional groups and determine optimum adsorption parameters. FTIR analysis confirmed the presence of functional groups such as –CH₂, –C–N, and –N⁺(CH₃)₃, indicating successful surface modification. UV-Vis analysis showed that the maximum adsorption occurred at a wavelength of 494 nm. The optimum conditions were achieved at an adsorbent mass of 1.5 g, dye concentration of 15 ppm, and contact time of 60 minutes, with adsorption efficiency reaching over 97%. These findings suggest that CTAB-modified areca nut husk activated carbon has strong potential as an effective and low-cost adsorbent for removing dyes from wastewater.
Adsorption of Metanil Yellow Dye with Sugarcane Bagasse (Saccharum offinarum L.) Activated Carbon Modified with Cetyl Trimethyl Ammonium Bromide (CTAB) Surfactant Sasi Kirana; Ratna Sari Dewi
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68715

Abstract

Environmental pollution caused by textile industry wastewater containing synthetic dyes such as Metanil Yellow has become a serious concern due to its carcinogenic nature. This study aims to determine the adsorption capacity of activated carbon derived from sugarcane bagasse waste (Saccharum officinarum L.), which was activated using Potassium Hydroxide (KOH) and modified with the cationic surfactant Cetyl Trimethyl Ammonium Bromide (CTAB). The activated carbon was produced through carbonization at 500 °C for 2 minutes, followed by chemical activation using 5N KOH and surface modification with CTAB. FTIR characterization showed spectral changes with the appearance of new functional groups such as –CH₂ vibrations (2961 and 2849 cm⁻¹), –C–N (1020 cm⁻¹), and quaternary ammonium –N⁺(CH₃)₃ (1470 cm⁻¹), indicating successful interaction of CTAB molecules on the carbon surface. The adsorption results showed that optimum conditions were achieved at an adsorbent mass of 1.5 grams, Metanil Yellow concentration of 25 ppm, and a contact time of 30 minutes, with an adsorption efficiency of 94%.

Page 16 of 18 | Total Record : 179

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