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All Journal Warta AKAB Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.)
Pradipta, Adya Rizky
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Materials Science & Nanotechnology

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Synthesis of Modified TiO₂ Nanocomposite using Fe₃O₄ and Nickel as Photocatalyst in Reduction of Silver Ions Pradipta, Adya Rizky; Irunsah, Aslan
Indonesian Journal of Chemical Studies Vol. 1 No. 1 (2022): Indones. J. Chem. Stud., June 2022
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (656.656 KB) | DOI: 10.55749/ijcs.v1i1.7

Abstract

The use of TiO2 nanocomposite modified with Fe3O4 dan Ni dopping for silver ion photoreduction has been successfully carried out. In this study, nanocomposites were fabricated through the sol-gel technique. Structure, optical, and magnetic properties were analyzed using XRD, DRUV-Vis, FTIR, and VSM analysis. The XRD pattern revealed the anatase phase of TiO2 and the iron oxide formed was Fe3O4. UV-Vis spectroscopy showed the formation of absorption in the visible region in the presence of Ni doping. The nanocomposite had magnetic properties of 12.6 emu/g with paramagnetic type. TiO2 nanoparticles presented the percentage reduction of Ag ions with UV and Visible light of 82.65% and 21.43%, respectively, while Fe3O4/ TiO2-Ni with UV and Visible light were 80.93% and 90.72%, respectively. Ni-dopped nanocomposites had shown high photocatalytic activity under both UV and Visible irradiation.
Magnetically Chitosan-Silica-Based Biosorbent as Efficient Removal of Au(III) in Artificial Wastewater Pradipta, Adya Rizky; Putri, Regita Andriani Wiana; Khairani, Inna Yusnila; Hasnowo, Lutfi Aditya
Indonesian Journal of Chemical Studies Vol. 3 No. 1 (2024): Indones. J. Chem. Stud., June 2024
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v3i1.40

Abstract

The synthesis of chitosan-modified silica-coated iron oxide magnetic material (Fe3O4/SiO2/Chitosan) via the sol-gel process addresses the need for enhanced stability and functionality in various applications. Coating iron oxide magnetic material with chitosan-modified silica is a common strategy to improve biocompatibility and performance. This study investigates the synthesis of Fe3O4/SiO2/Chitosan using sodium silicate as the silica precursor. The synthesis involved sonication of Fe3O4 and sodium silicate for 5 min, followed by adding chitosan in 4% acetic acid with continuous stirring. The mass ratio of Fe3O4:SiO2 was fixed at 0.5:0.73, with varying chitosan masses (0.025, 0.050, and 0.075 g). Characterization techniques used included Fourier-Transform Infrared Spectroscopy (FTIR), X-ray powder Diffraction (XRD), and Thermogravimetric analysis (TGA). The product with the highest mass yield was further analyzed. The variation in the amount of chitosan in the conducted research aimed to determine the optimum chitosan mass that could still bind to the silica framework. Magnetite was confirmed as the primary composition, with the addition of chitosan and silica functional groups observed through vibration absorption characteristics. Thermogravimetric analysis showed differences in decomposition patterns between samples. The optimal chitosan content for characterization was determined at 0.050 g. Future applications might include enhanced adsorption processes owing to the optimized structure and composition of Fe3O4/SiO2/Chitosan nanoparticles.
Study of Anaerobic and Aerobic Fertilizers of Organic Waste Treatment Fadela, Dian Mira; Zakaria, Ahmad; Pradipta, Adya Rizky
Indonesian Journal of Chemical Studies Vol. 3 No. 2 (2024): Indones. J. Chem. Stud., December 2024
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v3i2.48

Abstract

Phosphorus is a critical nutrient for plant growth, significantly enhancing agricultural productivity and ecosystem sustainability. Organic waste-based fertilizers offer a sustainable solution to boost soil phosphorus levels while addressing waste management challenges. This study evaluated the phosphorus content of anaerobic and aerobic fertilizers derived from organic waste, focusing on factors that influence phosphorus dynamics during composting. Composting methods and feedstock composition affected phosphorus transformation and availability, with temperature, moisture, aeration, and microbial activity playing pivotal roles in mineralization, immobilization, and solubilization. The experiment used market waste, pineapple peel, dry leaves, sawdust, water, sugar, manure, and EM4. The composting process involved weekly monitoring of pH, temperature, and compost height. The results showed that the pH of the anaerobic compost ranged from 7.2 to 7.4, meeting the SNI 19-7030-2004 standard. The mature compost color was brownish-black, which also complied with the standard. Phosphorus contents as P2O5 were 1712 mg/kg in aerobic fertilizer and 2653 mg/kg in anaerobic fertilizer. Phosphorus is crucial for root development, water, and nutrient absorption, and enhances plant tolerance to drought. It also affects flower and fruit formation, affecting crop yield quality and quantity. This study highlighted the importance of understanding phosphorus dynamics to optimize nutrient management and improve organic waste utilization in agriculture. Future research should explore the phosphorus transformation mechanisms and innovative composting techniques to enhance phosphorus availability for plant uptake
Sintesis dan Karakterisasi Zinc Layered Hydroxide Salts (Zn-LHS) sebagai Adsorben Methyl Orange pada Tingkat Keasaman yang Berbeda Pradipta, Adya Rizky; Putri, Regita Andriani Wiana
Journal Warta AKAB Vol 48, No 2 (2024): Desember 2024
Publisher : Politeknik AKA Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55075/wa.v48i2.228

Abstract

Penelitian ini bertujuan untuk mengkaji karakterisasi dan kinerja adsorpsi Zinc Layered Hydroxide Salts (Zn-LHS) terhadap Methyl Orange (MO) dalam lingkungan dengan berbagai tingkat keasaman. Zn-LHS disintesis melalui metode kopresipitasi dan dianalisis menggunakan XRD untuk menentukan kristalinitas serta FTIR untuk mengidentifikasi gugus fungsi yang ada sedangkan SEM-EDX digunakan untuk analisis permukaan Zn-LHS. Zn-LHS yang dihasilkan diuji sebagai adsorben MO dengan menilai stabilitasnya dalam medium asam dan basa serta pengaruh keasaman medium terhadap kemampuan adsorpsi MO. Zn-LHS dengan rasio mol -OH/Zn 0,6 dipilih sebagai adsorben utama dalam studi adsorpsi ini berdasarkan pertimbangan kristalinitas yang lebih tinggi dan kemurnian material. Analisis FTIR menunjukkan adanya puncak vibrasi –OH, H-O-H, dan ion nitrat pada spektra Zn-LHS hasil sintesis. Pengukuran SEM menunjukkan bahwa Zn-LHS memiliki bentuk lempengan bulat pipih dengan rata-rata diameter partikel 2 ± 0,3 µm. Penelitian ini juga mengevaluasi parameter lain seperti kapasitas adsorpsi dan stabilitas material dalam berbagai kondisi pH. Stabilitas Zn-LHS diuji dalam rentang pH 1 hingga 12, di mana material menunjukkan stabilitas yang lebih baik pada pH di atas 2. Hasil penelitian menunjukkan bahwa pH 3 merupakan kondisi optimum untuk adsorpsi MO oleh Zn-LHS dengan kapasitas adsorpsi mencapai 1,213 x 10-5 mol g-1. Studi ini menekankan pentingnya pemilihan rasio mol -OH/Zn yang tepat dan kondisi lingkungan yang optimal untuk memaksimalkan efisiensi adsorpsi Zn-LHS sebagai adsorben MO. Temuan ini berpotensi untuk diterapkan dalam pengolahan limbah industri yang mengandung zat warna anionik. Kata kunci : Zinc Layered Hydroxide Salts (Zn-LHS); metil jingga; adsorpsi; karakterisasi; tingkat keasaman
Co-Authors Ahmad Zakaria Fadela, Dian Mira Hasnowo, Lutfi Aditya Irunsah, Aslan Khairani, Inna Yusnila Putri, Regita Andriani Wiana