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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Sains Dasar Indonesian Journal of Chemistry Greensphere: Journal of Environmental Chemistry
Choiril Azmiyawati
Chemistry Department, Faculty Of Sciences And Mathematics, Diponegoro University, Jl. Prof. Soedarto, SH., Tembalang, Semarang|Diponegoro University|Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering

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Sintesis Silika Gel-Cu(II) dari Limbah Geothermal dengan Metode Sol-Gel sebagai Antibakteri Escherichia Coli dan Staphylococcus Aureus Nabilah, Wardah; Pardoyo, Pardoyo; Azmiyawati, Choiril
Greensphere: Journal of Environmental Chemistry Vol 5, No 2 (2025): Volume 5 Nomor 2 Tahun 2025
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gjec.2025.29633

Abstract

Sintesis material silika gel-Cu(II) telah dilakukan. Tujuan dari penelitian ini adalah untuk mensintesis silika gel-Cu(II) berbasis limbah geothermal PLTPB Dieng serta menentukan pengaruh variasi konsentrasi Cu(II) dan waktu aging terhadap aktivitas antibakteri Escherichia coli dan Staphylococcus aureus. Natrium silikat diperoleh dari limbah geothermal melalui ekstraksi alkali dan selanjutnya dilakukan sintesis silika gel-Cu(II) melalui metode sol-gel dengan adanya penambahan CuSO4 dalam berbagai variasi konsentrasi dan waktu aging. Hasil penelitian menunjukkan bahwa silika gel-Cu(II) telah berhasil disintesis. Material katalis memiliki ukuran <10 µm dan berwarna biru muda. Studi aktivitas antibakteri menunjukkan silika gel-Cu(II) dengan konsentrasi CuSO4 0,5 M dan waktu aging 84 jam memiliki aktivitas antibakteri paling baik. Berdasarkan pengamatan diameter zona bening, diketahui bahwa efektifitas silika gel-Cu(II) 0,5 M dalam menghambat pertumbuhan bakteri Staphylococcus aureus lebih tinggi dibandingkan dengan Escherichia coli. 
Encapsulation of Urea-Ammonium Nitrate (UAN) Solution Fertilizer in Silica-Cellulose Matrix for Slow-Release Nitrogen and Improved Growth of Pakcoy (Brassica rapa L.) Permatasari, Rizki; Azmiyawati, Choiril; Sriatun, Sriatun
Jurnal Kimia Sains dan Aplikasi Vol 29, No 2 (2026): Volume 29 Issue 2 Year 2026
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.29.2.73-81

Abstract

Nitrogen (N) is an essential macronutrient required for plant growth; however, its absorption efficiency remains relatively low due to significant nitrogen loss to the environment. To overcome this limitation, the development of slow-release fertilizers (SRF) is crucial, enabling controlled, gradual nutrient release. This study aims to develop and evaluate a cellulose-modified mesoporous silica matrix as an encapsulation material for Urea-Ammonium Nitrate (UAN) fertilizer, a liquid formulation containing urea, ammonium, and nitrate. The material was synthesized using the sol-gel method with variations including pure silica, non-calcined silica-cellulose, silica-cellulose calcined at 550°C and 700°C, and cross-linking with glutaraldehyde. Characterization techniques included Fourier Transform Infrared Spectroscopy (FTIR) for functional group identification, Scanning Electron Microscopy combined with Energy Dispersive X-ray (SEM-EDX) for morphology and elemental composition, and Gas Sorption Analyzer (GSA) for surface area and pore size analysis. The results showed that the silica-cellulose composite calcined at 550°C (SSCGK550) had the highest fertilizer release value of 893.7 ppm. Plant growth test results show that plants treated with SSCGK550 had the highest growth, with a length of 8 cm and 8 leaves per stem by day 15, whereas plants treated with conventional fertilizer (control) showed a lower growth response, with an average height of 5 cm and only 3 leaves per stem by day 15. These findings demonstrate the success of encapsulating UAN fertilizer in a silica-cellulose matrix and highlight its potential as an efficient slow-release fertilizer to support sustainable agriculture.
Co-Authors Adi Darmawan Ali Djamhuri Anugrah Ricky Wijaya Artha Monica Andini Ayub Indra D. Widodo Damar Nurwahyu Bima Dini Hayati Endang Sawitri Endang Sawitri Erna Kurnia Sari Isharyanti, Isharyanti Janitra, Atikah Ayu Khairini Pertiwi L Suyati Lia Puspita Dewi Maranti Sianita Mohd Hafiz Dzarfan Othman Mukhammad Asy&#039;ari Nabilah, Wardah Nanik Wijayanti Narsito Narsito Narsito Narsito Nor Aida Zubir Nor Basid Adiwibawa Prasetya Nurwarrohman Andre Sasongko Nuryono Nuryono Nuryono Nuryono P Siahaan Pardoyo Pardoyo Parsaoran Siahaan Permatasari, Rizki Priatmoko Priatmoko Pulojuliadi Nababan R. Nuryanto R.A. Novitasari Ratna Kusumawardani Retno Ariadi Lusiana Retno Dwi Soelistyowati Sriatun Sriatun Suhartana Suhartana Taslimah Taslimah Taslimah Taslimah W.H. Rahmanto Yanti Sri Rejeki