椰子纤维生物垃圾吸附剂吸附敌敌畏和吡蚜酮机理的异同

Q. Binh, D. Tungtakanpoung, P. Kajitvichyanukul
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引用次数: 6

摘要

摘要本研究考察了椰子纤维生物垃圾吸附剂(CF-BWS)对敌敌畏、吡蚜酮吸附机理的异同。CF-BWS采用600℃慢热解4 h制得。采用HCl酸改性提高了比表面积。采用SEM、FT-IR、BET、pHpzc等分析了CF-BWS的性质。用拟二级模型很好地解释了CF-BWS对敌敌畏和吡蚜酮的吸附动力学。两种杀虫剂的吸附等温线均符合Langmuir等温线。分子结构和表面化学的差异导致两种杀虫剂的吸附机制不同。孔填充和疏水相互作用是两种杀虫剂吸附的关键机制。而π -π电子供体-受体相互作用对吡蚜酮的吸附起主要作用,对敌敌畏的吸附影响不大。在吡蚜酮吸附过程中,氢键机制明显,但对敌敌畏的吸附影响不大。CF-BWS是一种去除这两种污染物的优良材料,在水处理过程中作为吸附剂有很大的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Similarities and differences in adsorption mechanism of dichlorvos and pymetrozine insecticides with coconut fiber biowaste sorbent
Abstract In this study, the similarities and differences of the adsorption mechanisms between dichlorvos and pymetrozine and coconut fiber biowaste sorbent (CF-BWS) were investigated. CF-BWS was produced using the slow pyrolysis process at 600 °C for 4 h. HCl acid modification was used to improve the specific surface area. The properties of CF-BWS were analyzed by SEM, FT-IR, BET, and pHpzc. The adsorption kinetics of dichlorvos and pymetrozine on the CF-BWS were well explained by the pseudo-second-order model. The adsorption isotherms for both insecticides were followed the Langmuir isotherm. The difference in molecular structures and surface chemistry caused the difference in adsorption mechanisms of both insecticides. The pore-filling and the hydrophobic interactions were the key mechanisms for both insecticide adsorptions. However, the π–π electron donor–acceptor interaction played the major role in the pymetrozine adsorption but hardly impacted on the adsorption of dichlorvos. The hydrogen bonding mechanism was pronounced in the pymetrozine adsorption, but it had little influence on the dichlorvos adsorption. The CF-BWS is exhibited as an excellent material for the removal of both pollutants and has high potential to be used further as the adsorbent in water treatment process.
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