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INDONESIA
Al-Kimia
Published by Universitas Islam Negeri Alauddin Makassar
ISSN : 23022736     EISSN : -     DOI : -
Core Subject : Science,
Chemistry
Al-Kimia is a journal of chemistry that published by Department of Chemistry, Faculty of Science and Technology UIN Alauddin Makassar. The journal is published twice a year on January-June and July-December. This journal encompasses original research articles in all aspects of chemistry and related area. The journal, which was firstly published in July 2013, is a forum for communication of research results, review the results of research, methodologies and new approaches in research related to chemistry in Indonesia.
Arjuna Subject : -
Articles 238 Documents
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Sintesis Aluminium Formate-MOF dari Limbah Kaleng sebagai Material Penangkap Karbon Menggunakan Metode Solvotermal Parmadi, Faris Achmad; Nurjannah, Nikmah; Ramadhani, Muhammad Ardycha Yudha; Wulandari, Amalia; Anjasmoro; Arifin, Zainal
Al-Kimia Vol 12 No 2 (2024): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v12i2.50747

Abstract

This research aims to synthesize and characterize aluminum formate-metal organic framework (ALF-MOF) from beverage can waste using solvothermal method. The solvothermal method was chosen due to its ability to produce materials with controlled structures and superior properties. This research also uses a Central Composite Design (CCD) experimental design to optimize the synthesis conditions. The ALF-MOF synthesis process was carried out by mixing Al(OH)3 powder obtained from the extraction of aluminum in beverage can waste and HCOOH in DMF. The mixture was stirred and heated in an autoclave reactor at Al/HCOOH mole ratios (1:3, 1:5, and 1:7) and reaction times (1, 2, and 3 hours). Furthermore, the products were characterized using FTIR, XRD, SEM, and BET. Based on the results, it is known that the optimum synthesis conditions were achieved at the Al/HCOOH mole ratio and reaction time of 1:3.729 and 2.874 hours, respectively, with an ALF-MOF yield value of 87.71%. Characterization results showed the presence of COO groups and Al-O-Al groups. The ALF-MOF product also has an average particle diameter of 23.57 nm with a %crystallinity of 51.30% and a surface area of 128.507 m2/gram.
A Green Synthesis of Iron Oxide Nanoparticles Using Full Factorial Experimental Design: Technical and Analytical Impact of FeCl3.6H2O Precursor on Yield Haryan Adi Rogo, Ben; Luthfiyah Zahra, Khaneisya; Nadia; Pijar Mentari, Dian; Rhaima Putri, Tyara; Sidiq Suryakusuma, Rahmat; Amalia Sholeha, Novia
Al-Kimia Vol 13 No 1 (2025): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Green synthesis of iron oxide nanoparticles (IONPs) has emerged as an eco-friendly alternative to conventional synthesis methods. This method utilizes natural ingredients, such as green tea extract, as a reducing agent that supports the green chemistry process. This research aims to analyze the effects of precursor concentration, reducing agent volume, and reaction temperature on the synthesis results using technical and pro-analytical FeCl3.6H2O precursors. A full factorial design was employed to assess the effect of synthesis conditions on the IONPs yield. The yield was statistically analyzed using analysis of variance (ANOVA). The analysis results reveal that the predicted values are within reasonable consistency based on the experimental data of both IONPs from the technical and pro-analytical precursors. The ANOVA values for both precursor sources show that the reaction temperature factor is negatively correlated, while the precursor concentration and reducing agent volume positively correlate with the IONPs yield. Regression model variance (ANOVA) can be explained 98.15% for the technical precursor model and 99.83% for the analytical precursor model from data variations. This research can determine the optimal combination of synthesis factors that provide a basis for selecting a synthesis strategy tailored to specific performance requirements. These findings can support the wider application and reproducibility of green synthesis methods in various research contexts and implications for industry.
ADSORPSI KALSIUM AIR PAYAU SEBAGAI SUMBER AIR BERSIH BAGI MASYARAKAT PESISIR DENGAN SILIKA TERMODIFIKASI DARI ABU SEKAM PADI Kahar, Kaharuddin; Edihar, Muh; Harimu, La; Dahlan; Mutmainnah
Al-Kimia Vol 13 No 1 (2025): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Many Indonesian residents have difficulty obtaining clean water, especially people who live in coastal areas. Those who live there can only consume brackish water which is considered to have side effects on health due to the excessive calcium content. This research offers a simple method, namely adsorption using abundant raw materials, namely rice husk ash from agricultural waste resulting from burning rice husks. Using husks directly has less effectiveness, so it needs to go through additional processes such as removing impurities and modifying the structure. This research aims to reduce calcium levels in brackish water using silica that has been modified from rice husk ash. The process of making adsorbents is carried out by sieving, heating, filtering, washing to obtain silica, then modifying and optimizing important parameters until its application to brackish water. The difference between pre-modified and modified silica can be seen in the characterization with FTRI at wave numbers from 470 cm-1 to 430 cm-1 1, namely deeper bending vibrations, which are also clarified by the surface condition with more structured pores seen in the SEM results. The modified silica works optimally at a mass of 0.4 grams, pH 7.5, contact time of 40 minutes and concentration of 50 ppm. It has an adsorption capacity of 3.2 mg/g and follows the Langmuir isotherm pattern.
The Potential of Jackfruit Wood as Activated Carbon for Adsorption of Heavy Metal Mercury (Hg) through Pyrolysis Method Zimon Pereiz; Chuchita; Oksal, Efriyana; Maya Sylvani, Miranti; Irawan, Ahmad; Pebriyanto, Yunus; Hairiah, Rusliananur; Eka Jaya Prastiti, Arini; Berlisnora Dasilva, Caroline; Anatasya, Violina; Prisnanda, Risky
Al-Kimia Vol 13 No 1 (2025): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Water pollution caused by heavy metal mercury is a serious problem today. This study aims to utilise jackfruit wood waste as a natural adsorbent in overcoming the problem of water pollution due to heavy metal mercury. The methods in this research include jackfruit wood preparation, hydrochar synthesis through pyrolysis, hydrochar activation, wastewater preparation, batch adsorbent optimum conditions, and dynamic adsorption process (Fixed-Bed Column). The results showed that the optimum adsorption condition was reached at 0.4 M HCl concentration, pH 3 and 80minutes contact time. The study also showed that the adsorption kinetics followed a second-order pseudo model with a rate constant of 1.712 x 10-2 g/mg.min. The research data also showed conformity with the Langmuir isotherm model, with an adsorption capacity of 63.036 mg/g. The results of this study prove that jackfruit wood waste is effectively used as raw material for making activated carbon for wastewater treatment applications in removing heavy metal mercury.
Profiling and characterizing of banana (Musa paradisiaca) flower bracts-based bioplastic with sorbitol as a plasticizer Ebit Nugroho, Deni; Tri Suryandari, Ervin; Hadi Kusuma, Hamdan; Mujiasih; Kustomo
Al-Kimia Vol 13 No 1 (2025): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Banana flower bracts (BFB) are a promising source of starch as a bioplastic material. However, starch-based bioplastics products are primarily stiff and rigid to shape. Polyvinyl alcohol (PVA) may improve the elasticity and increase force resistance of starch-based bioplastics. Therefore, this study aims to analyze the characteristics and determine the optimal combination of BFB starch and PVA concentration for bioplastic production. The BFB were chopped and boiled until soft, soaked in sodium bisulfite solution for 30 minutes, and dried to produce fine powder. The powder was macerated in clean water for two days to produce starch, which was then combined with 0.5 chitosan and various concentrations of PVA. Physical characteristic tests, including Force, tensile strength, elongation, and biodegradation, were measured to determine the best composition. This study found the combination of 0.5 gr of BFB starch, 0.5 gr of chitosan, and 10 ml of PVA improved the capability of bioplastic to hold more than 13 N and tensile strengths up to 25 MPa. Furthermore, increasing BFB concentration is in line with enhanced durability; however, it reduces flexibility. Conversely, PVA significantly increased plasticity and elasticity while maintaining high biodegradability (61.2% per day).
Characterization of Biodegradable Avocado Seed Starch Films Reinforced with Chitosan and Plasticized with Glycerol Hartanti, Adelia; Nur Wahyudi, Mohamad; Fahmi Hakim, Muhammad; Rohmaful Aeni, Alfieta; Agustina Sari, Dessy
Al-Kimia Vol 13 No 1 (2025): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Researchers have developed biodegradable bioplastics from renewably sourced natural materials in response to the environmental consequences of synthetic plastics. This study looks at how different amounts of glycerol and chitosan affect the properties of bioplastics made from avocado seed starch. This study evaluated the mechanical, hydrophilic, and degradation properties in terms of tensile strength, elongation at break, thickness, water absorption, and structural stability over time. The results showed that an increase in glycerol content improved flexibility and elongation but impaired tensile strength and water resistance. On the other hand, the increase of chitosan concentration contributes to a significant enhancement of tensile strength, water resistance, and stability. The mixture A3 (1 ml glycerol, 4.5 g chitosan) was thought to have good mechanical stiffness (16.560 ± 3.661 MPa) and water resistance. On the other hand, B1 (2 ml and 2.5 g) had better elasticity (elongation: 32.299 ± 8.910%). Upon performing degradation analysis, B-series samples exhibited a high hydrophilicity, which caused faster breakdown as opposed to A-series samples. Avocado seed starch plasticized by a combination of chitosan and glycerol shows promise as an environmentally friendly plastic, and this study shows a way toward fine-tuning both mechanical and hydrophilic properties to produce biodegradable bioplastics
Karakterisasi Zat Warna Kayu Secang (Caesalpinia sappan L.) Fraksi Kloroform:Metanol sebagai Photosensitizer pada Dye Sensitized Solar Cell Suriadi; Aisyah; Suriani; Ibrahim Patunrengi, Iswadi
Al-Kimia Vol 13 No 1 (2025): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

The electricity crisis in Indonesia is caused by the decreasing supply of fossil fuels for power plants. One solution to overcome this problem is the Dye-sensitized Solar Cell (DSSC) which can convert sunlight into electrical energy by utilizing environmentally friendly organic dyes. This study has succeeded in making and determining DSSC using organic dyes derived from sappanwood extract with pH variations (4, 7, and 10). Each pH level produces efficiency values ​​of 0.01714%, 0.05497% and 0.03174%. VLC with a chloroform: methanol ratio (5:5 and 1:9) was then characterized using UV-Vis, FTIR, and GC-MS instruments. Characterization of sappanwood dye extract using UV-Vis instrument showed absorption at wavelengths of 243, 285, 445, and 541. FTIR instrument provided information on functional groups –OH at wave number 3415.93 cm-1 and C-O-C at wave number 1255.66 cm-1 which are characteristic of isoflavonoid compounds. In addition, GC-MS instrument indicated the possibility of fragment m/z 286 at retention time 9.54 is a brazilin
Isolation and Characterization of Amylolytic Bacteria From Peatlands Area in Central Kalimantan Nafisah, Zahrotun; Riana Dewi, Syahrani; Ayu Andhita, Naswa; Elya Resha, Enjel; Oksal, Efriyana; Ayu Pratika, Remi; Hermayantiningsih, Dwi
Al-Kimia Vol 13 No 1 (2025): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Peatlands in Central Kalimantan, Indonesia, are ecologically significant due to their acidic, organic-rich conditions, yet their microbial communities remain underexplored, particularly regarding their enzymatic potential. This study aimed to isolate and characterize amylolytic bacteria from peat soil collected at a depth of 143–150 cm in the LAHG CIMTROP area of Central Kalimantan. A total of 44 bacterial isolates were obtained using serial dilution and the gridding method. Screening for amylase activity identified isolate ENS31 as having the highest activity, shown by a clear halo on starch agar. ENS31 was further subjected to biochemical characterization and enzyme activity assays. The amylase enzyme exhibited optimal activity at pH 7 and 50°C, with a specific activity of 3.5 U/mg, and retained activity up to pH 12 (2 U/mg). These results indicate that ENS31 produces an enzyme stable in alkaline conditions despite originating from an acidic environment, demonstrating potential for industrial applications requiring pH and temperature-tolerant biocatalysts. This study contributes to understanding the functional diversity of peatland microbes and highlights tropical peat ecosystems as promising sources of novel enzymes.  

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