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Pemanfaatan Sekam Padi Menjadi Karbon Aktif Teraktivasi NaCl Sebagai Adsorben untuk Menjerap Logam Cr(VI) Fauziah, Zahra Nur; Fathurrahman, Muhammad; Kusumawardani, Linda Jati; Heliawati, Leny
ALCHEMY:Journal of Chemistry Vol 12, No 2 (2024): ALCHEMY: JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/al.v12i2.25825

Penelitian ini bertujuan untuk mensintesis serta menentukan kondisi optimum adsorpsi ion logam Cr (VI) oleh karbon aktif sekam padi teraktivasi NaCl. Penelitian ini dilakukan melewati tahap sintesis berupa serbuk sekam padi berukuran 60 mesh yang dikarbonisasi pada suhu 500 oC selama 2 jam dan selanjutnya diaktivasi menggunakan NaCl 5%. Karakterisasi karbon aktif sekam padi kemudian dilakukan menggunakan FTIR, SEM dan BET. Optimasi dilakukan menggunakan model rancangan Response Surface Methodology (RSM) desain Box Behnken terhadap 3 variabel bebas yaitu pH, bobot adsorben, dan waktu kontak. Efisiensi adsorpsi maksimum yang didapatkan kemudian dievaluasi menggunakan persamaan isoterm Langmuir dan Freundlich. Hasil penelitian menunjukan bahwa karbon aktif berhasil disentesis dan memiliki luas permukaan sebesar 236,884 m2/g. Kondisi optimum untuk proses adsorpsi adalah pada pH 2,13, bobot adsorben 0,7531 gram, serta waktu kontak 59,77 menit pada 50 mL larutan Cr (VI) 10 mg/L dan menghasilkan efesiensi adsorpsi 99,99%. Adsorpsi Cr (VI) oleh karbon aktif sekam padi teraktivasi NaCl mengikuti persamaan Langmuir.

Synthesis of Complex Compounds of Cr(III) Metal Ions and Their Application as Fluorosensors of Pb(II) and Cu(II) in Laboratory Waste Syahputri, Yulian; Sutanto, Sutanto; Kusumawardani, Linda Jati; Saputra, Muhammad Rizki
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol. 12 No. 1 (2025): June 2025
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v12i1.43967

Indonesia's exposure of lead (Pb) and copper (Cu) heavy metal ions to humans and the environment has received increased attention over the past few decades as a result of the increasing application of heavy metals in various industries and transportation. Complex compounds of Cr3+ sensors with fluorescence-based pyrazoline-derived ligands (fluorosensors) have the potential to detect Pb2+ and Cu2+ heavy metal ions. The purpose of this study is to synthesize complex compounds of Cr3+ ions with pyrazoline-derived ligands and its potential as a fluorescence-based sensor of Pb2+ and Cu2+ heavy metal ions. Complex compounds formed are characterized and fluorosensor study by spectroscopic methods. The results showed that the synthesis of complex compounds was successfully carried out and a brown precipitate with a melting point of 253.2°C was obtained. Based on the results of the characterization of complex compounds of Cr3+ metal ions with pyrazolin-derived ligands using a UV-Vis spectrophotometer, two absorption peaks were obtained at 226 and 370 nm, two peaks indicating the presence of transition types π→π* and n→π*. The fluorescence spectrophotometer results showed two emission peaks, the peak absorption maximum of Cr3+ complex compounds was in the region 491 nm with a fluorescence intensity of 320.40 a.u. The determination of the fluorosensor potential of Cr3+ complex compounds with the addition of Pb2+ and Cu2+ metal ions showed significant changes in fluorescence so that fluorosensor types were obtained for Cr3+ metal ion complex compounds with Pb2+ and Cu2+, namely "turn-on" and "turn-off", respectively.

The Quality of Bio-pellets Made by Combining Walnut Kernel Shells (Canarium Indicum L.) from Bogor, Indonesia, and Palm Kernel Shells as Renewable Energy Iryani, Ani; Kusumawardani, Linda Jati; Juniansyah, Ronaldo
Makara Journal of Science Vol. 29, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Using biomass as an energy source helps overcome the declining supply of fossil fuels. Bio-pellets—an energy product made from biomass—is one option that can be utilized. One source of biomass energy is walnut kernel shells. The walnut plant (Canarium indicum L.) is a forest tree grown in eastern Indonesia. The walnut plant is also located in the GOR Pajajaran area of Bogor City and has not been utilized for energy production. This study consists of three stages: 1) raw material preparation, 2) bio-pellet production, and 3) bio-pellet characterization in accordance with the Indonesian National Standard (SNI) 8951:2020. Based on the results of our study, bio-pellets made from 100% walnut kernel shells can be utilized as fuel, with a calorific value of 4,593 cal/g. Although the moisture content remains high, the calorific value still meets the standard for power plants according to SNI 8951:2020. In addition, palm kernel shells can improve the quality of bio-pellet products. The combination of 30% walnut kernel shells and 70% palm kernel shells improves calorific value, with the following specifications: 4,684.4 cal/g of calorific value, 8.83% moisture content, 1.85% ash content, 69.16% volatile materials, 19.30% fixed carbon, 0.02% sulfur content, and 1.18% bulk density.

TiO2/Zeolite Coal Fly Ash Nanocomposite for Photodegradation of Naphthol Blue Black Dye: Optimization and Mechanism under Visible Light Kusumawardani, Linda Jati; Syahputri, Yulian; Apriansyah, Apriansyah; Fathurrahman, Muhammad
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 11, No. 1, May 2025
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v11i1.45036

Naphthol Blue Black (NBB) is a water-insoluble synthetic azo dye with a molecular weight of 616.49 g/mol that requires alkaline treatment for solubility and poses environmental risks by reducing water quality, increasing BOD and COD, and disrupting aquatic ecosystems. The TiO₂/Zeolite Fly Ash nanocomposite represents a promising material for the photocatalytic degradation of NBB. Analysis of the TiO2/zeolite fly ash nanocomposites revealed the presence of Ti-O-Si and Ti-O-Al functional groups, along with a suitable band gap energy value of 2.85 eV for visible light consumption. The average particle size is 62-75 nm, with a relatively high crystallinity of 95.64%. The insertion of TiO2 into the surface of the zeolite changes the size of the catalyst from 62-75 nm to 10 nm and 98.2% crystallinity. An emphasis was placed on the key parameters governing the degradation process. The test results showed that the degree of degradation increases at lower pH, while changes in catalyst dosage and initial dye concentrations do not significantly affect the degradation of NBB. The addition of H2O2 demonstrates the increasing degradation efficiency. The optimum operating process was carried out by adding 1.2 % (v/v) of H2O2, the pH 2, 0.1% (w/v) of catalyst, an initial concentration NBB of 12 mg/l, and irradiating under visible light for 75 minutes. It was a short period to produce the best conditions for degrading 12 mg/l naphthol blue-black, with a degradation efficiency of 99.68%. The rate of photodegradation kinetics had a reaction rate constant of 0.0312 min-1 and was followed a pseudo-first-order Langmuir-Hinshelwood. From the results, it was found that adsorption is an essential factor in the photodegradability of the dye. The linear transform of the Langmuir isotherm curve was further used to determine the characteristic parameters, which included the maximum absorbable dye quantity Qmax=11,8217 mgg-1. LC-MS/MS analysis identified the compounds formed through the photocatalytic degradation of naphthol blue-black dye into lower-molecular-weight molecules, such as benzoic acid, maleic acid, and phenol, which can gradually break down naturally into carbon dioxide and water.

Intensification of catfish cultivation at Pokdakan Baraya in Kotabatu Village, Bogor Regency Hasanah, Uswatun; Kusumawardani, Linda Jati; Syahputri, Yulian; Mulyati, Ade Heri; Widiastuti, Diana; Warnasih, Siti
Jurnal Pengabdian Masyarakat Inovatif Vol. 3 No. 1 (2025): JPMI (Jurnal Pengabdian Masyarakat Inovatif)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/jpmi.v3i1.154

Kotabatu Village, located in Bogor District, is home to several Fish Cultivator Groups (Pokdakan), one of which is Pokdakan Baraya, focused on cultivating catfish. Based on a focus group discussion conducted by the Pakuan University Implementation Team, Pokdakan Baraya faces challenges related to low income, high production costs, and the risks involved in traditional fish farming practices. In response, the team proposed the introduction of the Biofloc system for fish cultivation. The service methods included a comprehensive survey to assess the conditions and needs of the target community, followed by focus group discussions (FGD). The next phase involved outreach by the Pakuan University service team, employing knowledge-sharing methods, case studies, and training on the biofloc technology. To evaluate the impact, regular monitoring and evaluation processes were implemented, which included counseling, pond construction, seed distribution, nursery establishment, and intensive catfish rearing using the biofloc system. As a result of the biofloc system’s adoption, pond productivity increased by 1.8%, and the harvest time was reduced by 15 days. Additionally, the knowledge of Pokdakan Baraya members regarding fish cultivation technology grew by 60%, and their income saw an 81% increase from the sale of the catfish. The successful implementation of this system demonstrates significant improvements in the efficiency, productivity, and economic stability of the community.

Intensification of catfish cultivation at Pokdakan Baraya in Kotabatu Village, Bogor Regency Hasanah, Uswatun; Kusumawardani, Linda Jati; Syahputri, Yulian; Mulyati, Ade Heri; Widiastuti, Diana; Warnasih, Siti
Jurnal Pengabdian Masyarakat Inovatif Vol. 3 No. 1 (2025): JPMI (Jurnal Pengabdian Masyarakat Inovatif)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/jpmi.v3i1.154

Kotabatu Village, located in Bogor District, is home to several Fish Cultivator Groups (Pokdakan), one of which is Pokdakan Baraya, focused on cultivating catfish. Based on a focus group discussion conducted by the Pakuan University Implementation Team, Pokdakan Baraya faces challenges related to low income, high production costs, and the risks involved in traditional fish farming practices. In response, the team proposed the introduction of the Biofloc system for fish cultivation. The service methods included a comprehensive survey to assess the conditions and needs of the target community, followed by focus group discussions (FGD). The next phase involved outreach by the Pakuan University service team, employing knowledge-sharing methods, case studies, and training on the biofloc technology. To evaluate the impact, regular monitoring and evaluation processes were implemented, which included counseling, pond construction, seed distribution, nursery establishment, and intensive catfish rearing using the biofloc system. As a result of the biofloc system’s adoption, pond productivity increased by 1.8%, and the harvest time was reduced by 15 days. Additionally, the knowledge of Pokdakan Baraya members regarding fish cultivation technology grew by 60%, and their income saw an 81% increase from the sale of the catfish. The successful implementation of this system demonstrates significant improvements in the efficiency, productivity, and economic stability of the community.

Purification of Used Cooking Oil with Avocado Seed Powder as Biosorbent Iryani, Ani; Hasanah, Retna; Kusumawardani, Linda Jati; Fathurrahman, Muhammad
Jurnal Kartika Kimia Vol 8 No 2 (2025): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v8i2.933

Cooking oil is a basic ingredient in food preparation. Repeated use of cooking oil at high temperatures produces free fatty acids (FFA), which indicate oil degradation. The initial free fatty acid content of the used cooking oil in this study was 0.95%. This study aimed to prepare, activate, and evaluate avocado seed powder as a biosorbent for reducing free fatty acids in used cooking oil and to determine the optimal adsorption conditions with respect to temperature, contact time, and adsorbent mass. The activated avocado seed biosorbent showed a moisture content of 5.40%, ash content of 0.68%, iodine adsorption capacity of 768 mg/g, methylene blue adsorption capacity of 22.57 mg/g, and a surface area of 84.69 m²/g. The optimum adsorption condition was achieved at 90°C, 120 minutes contact time, and 20 g adsorbent mass. Under these conditions, the free fatty acid content decreased from 0.95% to 0.40%, corresponding to a reduction in efficiency of 58.05%. The peroxide value and water content were also reduced significantly. The adsorption capacity of avocado seed biosorbent was 27.96 mg/g for free fatty acids, 3.28 mg/g for peroxide value, and 6.16 mg/g for water content.

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