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<p>In the present study, adsorption and kinetic studies were taken into account to analyze the efficiency of adsorbent prepared from the rice husk for the removal of toxic dichloromethane in an aqueous medium. The treatment techniques used to create adsorbents from rice husk were raw (untreated), chemically treated, and thermally treated. To assess the surface morphology, FTIR and FESEM were used. The adsorption was examined using UV–visible spectroscopy. Using quantitative data from the Image J processing program, the grain size distribution (GSD) from field-emission scanning electron microscopy (FE-SEM) images was assessed. The Gaussian Distribution Formula was used to get the average particle size. The effect of parameters such as solution pH, adsorbent dosage, initial concentration, and contact time on the adsorption of dichloromethane (DCM) was analyzed. The equilibrium adsorption was best represented by the Freundlich model, with a regression coefficient R<sup>2</sup> near 0.99 for all the three adsorbents. The experimental data's higher regression coefficient values better illustrated the pseudo-second-order validity. The adsorbents' moisture content, up to 15%, complied with Indonesian National Standard (SNI) No. 06–3730-1995. 81.17%, 92.16% and 94.18% of toxic dichloromethane were removed by raw rice husk (RRH), chemically treated rice husk (RHN), and thermally treated rice husk (RHH) respectively (with adsorbent dose 1&#xa0;g, DCM 200&#xa0;ml and contact time 240&#xa0;min). The removal %ages were 63.12%79.45% and81.35% (at pH 7 adsorbent dose 0.1&#xa0;g, dichloromethane (DCM) 200&#xa0;ml and contact time 240&#xa0;min). The adsorption capacities were 31.42&#xa0;mg/g, 39.58&#xa0;mg/g and 48.58&#xa0;mg/g (adsorbent dose 0.1&#xa0;g, dichloromethane (DCM) 200&#xa0;ml and contact time 240&#xa0;min) and 45.25&#xa0;mg/g, 52.25&#xa0;mg/g, and 53.85&#xa0;mg/g (adsorbent dose 0.1&#xa0;g, dichloromethane (DCM) 300&#xa0;ml and contact time 240&#xa0;min) by raw rice husk (RRH), chemically treated rice husk (RHN), and thermally treated rice husk (RHH) respectively. The novelty of the present research is the utilization one of the most accessible, low-cost green agricultural byproducts for the removal of toxic dichloromethane. This study opens the thought of investigation with more agricultural by-products for the removal of other toxic volatile organic compounds.</p> Graphical Abstract <p></p>

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Rice Husk as Potential, Low-Cost Green Adsorbent for the Removal of Toxic Dichloromethane: Characterization, Adsorption Kinetics, and Isotherm Studies

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Anju Mangotra

摘要

In the present study, adsorption and kinetic studies were taken into account to analyze the efficiency of adsorbent prepared from the rice husk for the removal of toxic dichloromethane in an aqueous medium. The treatment techniques used to create adsorbents from rice husk were raw (untreated), chemically treated, and thermally treated. To assess the surface morphology, FTIR and FESEM were used. The adsorption was examined using UV–visible spectroscopy. Using quantitative data from the Image J processing program, the grain size distribution (GSD) from field-emission scanning electron microscopy (FE-SEM) images was assessed. The Gaussian Distribution Formula was used to get the average particle size. The effect of parameters such as solution pH, adsorbent dosage, initial concentration, and contact time on the adsorption of dichloromethane (DCM) was analyzed. The equilibrium adsorption was best represented by the Freundlich model, with a regression coefficient R2 near 0.99 for all the three adsorbents. The experimental data's higher regression coefficient values better illustrated the pseudo-second-order validity. The adsorbents' moisture content, up to 15%, complied with Indonesian National Standard (SNI) No. 06–3730-1995. 81.17%, 92.16% and 94.18% of toxic dichloromethane were removed by raw rice husk (RRH), chemically treated rice husk (RHN), and thermally treated rice husk (RHH) respectively (with adsorbent dose 1 g, DCM 200 ml and contact time 240 min). The removal %ages were 63.12%79.45% and81.35% (at pH 7 adsorbent dose 0.1 g, dichloromethane (DCM) 200 ml and contact time 240 min). The adsorption capacities were 31.42 mg/g, 39.58 mg/g and 48.58 mg/g (adsorbent dose 0.1 g, dichloromethane (DCM) 200 ml and contact time 240 min) and 45.25 mg/g, 52.25 mg/g, and 53.85 mg/g (adsorbent dose 0.1 g, dichloromethane (DCM) 300 ml and contact time 240 min) by raw rice husk (RRH), chemically treated rice husk (RHN), and thermally treated rice husk (RHH) respectively. The novelty of the present research is the utilization one of the most accessible, low-cost green agricultural byproducts for the removal of toxic dichloromethane. This study opens the thought of investigation with more agricultural by-products for the removal of other toxic volatile organic compounds.

Graphical Abstract