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All Journal Makara Journal of Science Molekul: Jurnal Ilmiah Kimia ENVIRO: Journal of Tropical Environmental Research
Abu Masykur
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Sebelas Maret University, Jl. Ir. Sutami 36A Surakarta 57126
Biochemistry, Genetics & Molecular Biology Chemistry Energy Engineering Environmental Science Materials Science & Nanotechnology Social Sciences Transportation

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Rice Husk Ash-Derived Magnetized Silica Functionalized with TMPDT for Heavy Metal Ion Removal Hastuti, Sri; Irfani, Hasna Haifa; Nuzula, Rifania Aura; Saraswati, Teguh Endah; Masykur, Abu; Purnawan, Candra; Wibowo, Atmanto Heru; Fitriana, Dina
Molekul Vol 21 No 1 (2026)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2026.21.1.17837

Abstract

ABSTRACT. The removal of toxic heavy metal ions from water remains a critical environmental challenge. In this study, a novel magnetized mesoporous silica adsorbent functionalized with N1-(3-trimethoxysilylpropyl) diethylenetriamine (Fe₃O₄@SiO₂@meso-SiO2@TMPDT), synthesized from rice husk ash, was developed for the adsorption of Cd(II) and Pb(II) ions. The characterization of the adsorbent by FTIR, SEM-EDX, and TGA confirmed the successful synthesis of magnetized and TMPDT-functionalized silica derived from rice husk ash (Fe₃O₄@SiO₂@meso-SiO₂@TMPDT). The adsorption study consists of the determination of optimum pH, the adsorption kinetics study, and the adsorption isotherm. Batch adsorption studies showed that the optimal pH values for Cd(II) and Pb(II) adsorption were 4 and 3, respectively. The adsorption kinetics for both metal ions followed a pseudo-second-order model. Furthermore, the adsorption isotherms fitted both the Langmuir and the Freundlich models with comparable R² values. The maximum adsorption capacities (Qₘ) of Fe₃O₄@SiO₂@meso-SiO₂@TMPDT for Cd(II) and Pb(II) were 28.089 and 24.498 mg/g, respectively. These findings demonstrate that the developed adsorbents offer an effective and sustainable approach for heavy metal removal from aqueous systems. Keywords: adsorption, heavy metal ions, magnetized silica, rice husk ash, TMPDT
A Ferrocene-Modified Carbon Electrode Prepared from Coconut Shell Char for Cu(II) Detection in Water Aulia, Nabila Putri; Rahmawati, Fitria; Masykur, Abu; Heraldy, Eddy
Makara Journal of Science Vol. 30, No. 1
Publisher : UI Scholars Hub

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A ferrocene (Fc)-modified carbon electrode was prepared from coconut shell char (CSC), which was activated with NaOH to produce an activated coconut shell carbon (Ac-CSC). The carbon electrode was designed as a printed-carbon electrode consisting of working, counter and reference electrodes in a single piece, called a screen-printed carbon electrode, or SPCE. An Fc solution was applied to the working electrode part at 10%, 20% and 30% mass of the SPCE, producing an SPCE-Fc as an electrochemical sensor for Copper ions Cu(II) detection. The prepared activated carbon was analysed by XRD, FTIR, SEM/EDX, surface area analysis and impedance measurement to determine its diffraction pattern, available specific functional groups, morphology, elemental content, surface area and electrical conductivity. The results showed that CSC consists of 52.89% amorphous carbon, 19.65% nitrogen and 23.12% oxygen. FTIR analysis showed C=O, C=C, C-H, C-O, O-H, N-H and C-S vibrations. The Ac-CSC provided an electrical conductivity rate of 26.025 S/cm. Cyclic voltammetry analysis of the Cu(II) solution with SPCE-Fc10% provided the highest current density among the other Fc contents. Therefore, a further study used SPCE-Fc10% to determine the limit of detection (LoD), interference effects, pH and scan rate effects, the repeatability of the analysis and the reproducibility of SPCE-Fc10% for Cu(II) detection. The LoD was 0.055 mM. The electrode fabrication also showed good reproducibility, as evidenced by a repeatability coefficient (R) of 0.06. The interference test showed that the SPCE-Fc10% selectively detected Cu(II), even in the presence of 5% volume of Pb(II) and Co(II) in the Cu(II) solution.
Sinergisme Campuran Tanah Andisol dan Pasir Foundry sebagai Adsorben Ion Cu (II) pada Limbah Industri Pelapisan Logam Pranoto, Pranoto; Masykur, Abu; Prihanandya, Rania Satwika Putri
ENVIRO: Journal of Tropical Environmental Research Vol 24, No 1 (2022): Maret
Publisher : Center for Environmental Research, LPPM, Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/enviro.v24i1.65039

Abstract

Research has been carried out on the synergism of a mixture of andisol soil and foundry sand as Cu(II) ion adsorbent. This study aims to determine the effect of mixing andisol soil and foundry sand on the absorption of Cu (II) ions and to study the type of isotherm and its adsorption kinetics model. The adsorbent was activated with 3 M NaOH. The acidity of the adsorbent was analyzed using the specific total acidity test method. The final concentration of Cu (II) ions was analyzed using AAS (Atomic Absorption Spectroscopy). The optimum adsorption conditions were obtained based on variations in composition, pH, and contact time. The adsorbent was made with variations in the composition of andisol: foundry sand 100:0, 75:25, 50:50, 25:75 and 0:100 (w/w). The effect of adsorption conditions was carried out by varying the pH of the copper (Cu) solution from 3-7. The effect of contact time was varied at 15-135 minutes with 15 Minute intervals.
Co-Authors Atmanto Heru Wibowo Aulia, Nabila Putri Bintang Junita Siagian, Bintang Junita Buchari Buchari Candra Purnawan Desi Suci Handayani Eddy Heraldy Fitria Rahmawati Fitriana, Dina Hajar Prasetyo, Hajar Hindun Wulandari, Hindun Indah Rizki Fitriani, Indah Rizki Indra Noviandri Irfani, Hasna Haifa Laksono Trisnantoro Nuzula, Rifania Aura PRANOTO Prihanandya, Rania Satwika Putri Sayekti Wahyuningsih Sri Hastuti Teguh Endah Saraswati Tri Martini Triana Kusumaningsih Weny Pudiastuti, Weny Zainal Arifin Almaqqomul Amin, Zainal Arifin