稻壳介孔活性炭对亚甲基蓝染料的吸附性能及机理研究

Q3 Environmental Science
Suchada Sawasdee, Prachart Watcharabundit
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引用次数: 0

摘要

由于合成染料具有不良的生态毒理学效应,其对环境的污染是一个严重的问题。以h3po4活化稻壳(AC-RH)为原料制备活性炭吸附亚甲基蓝(MB),并对其吸附机理进行了预测。对AC-RH进行了N2吸附、表面官能团、化学成分和表面形貌表征。该活性炭87%的孔体积直径为3 ~ 50nm,属于介孔材料。研究了不同条件下对MB的吸附。最佳吸附条件为pH为8,理想平衡时间为360 min。30°C条件下,MB浓度为25 ~ 200 mg/L时,吸附效果最佳。Freundlich等温线模型符合平衡数据,Langmuir等温线的最大吸附量为26.31 mg/g。动力学分析表明,该吸附为准二级吸附,温度越高,吸附速率常数(k2)越高。在20 ~ 40℃的热力学吸附研究中,吉布斯自由能(G)为-6.291 ~ -9.197 kJ/mol,活化能(Ea)为26.248 kJ/mol,表明亚甲基蓝的吸附是自发的、物理的。吸附机理为氢键、孔填充、吉田氢键、n-相互作用、静电和阳离子交换。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterization and Adsorption Mechanism of Methylene Blue Dye by Mesoporous Activated Carbon Prepared from Rice Husks
Environmental contamination due to synthetic dyes is a severe problem due to their adverse eco-toxicological effects. This study prepared activated carbon from H3PO4-activated rice husks (AC-RH) to adsorb methylene blue (MB) and predicted the adsorption mechanism. The AC-RH was characterized for N2 adsorption, surface functional groups, chemical compositions, and surface morphology. The activated carbon was classified to be a mesoporous material because 87% of its pore volume diameters are 3-50 nm. MB adsorption was studied under different conditions. Optimal MB adsorption occurred at pH 8, and the ideal equilibrium time was 360 min. The equilibrium adsorption was evaluated at concentrations of MB between 25 and 200 mg/L at 30°C. The Freundlich isotherm model matched the equilibrium data, and the greatest adsorption capacity of the Langmuir isotherm was 26.31 mg/g. The kinetic analysis revealed that the adsorption was pseudo-second-order, and its rate constant (k2) was higher at higher temperatures. For the thermodynamic adsorption study at 20 to 40°C, the Gibbs free energy (G) values were -6.291 to -9.197 kJ/mol, and the activation energy (Ea) was 26.248 kJ/mol: therefore, the methylene blue adsorption was spontaneous and physical. This study also revealed that the adsorption mechanisms were H-bonding, pore-filling, Yoshida H-bonding, n- interactions, electrostatic, and cation exchange.
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来源期刊
Environment and Natural Resources Journal
Environment and Natural Resources Journal Environmental Science-Environmental Science (all)
CiteScore
1.90
自引率
0.00%
发文量
49
审稿时长
8 weeks
期刊介绍: The Environment and Natural Resources Journal is a peer-reviewed journal, which provides insight scientific knowledge into the diverse dimensions of integrated environmental and natural resource management. The journal aims to provide a platform for exchange and distribution of the knowledge and cutting-edge research in the fields of environmental science and natural resource management to academicians, scientists and researchers. The journal accepts a varied array of manuscripts on all aspects of environmental science and natural resource management. The journal scope covers the integration of multidisciplinary sciences for prevention, control, treatment, environmental clean-up and restoration. The study of the existing or emerging problems of environment and natural resources in the region of Southeast Asia and the creation of novel knowledge and/or recommendations of mitigation measures for sustainable development policies are emphasized. The subject areas are diverse, but specific topics of interest include: -Biodiversity -Climate change -Detection and monitoring of polluted sources e.g., industry, mining -Disaster e.g., forest fire, flooding, earthquake, tsunami, or tidal wave -Ecological/Environmental modelling -Emerging contaminants/hazardous wastes investigation and remediation -Environmental dynamics e.g., coastal erosion, sea level rise -Environmental assessment tools, policy and management e.g., GIS, remote sensing, Environmental -Management System (EMS) -Environmental pollution and other novel solutions to pollution -Remediation technology of contaminated environments -Transboundary pollution -Waste and wastewater treatments and disposal technology
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