Center of Excellence on Environmental Research and Innovation, Faculty of Engineering, Naresuan University, Phitsanulok, Thailand.
Faculty of Applied Sciences-Health, Dong Nai Technology University, Dong Nai, Vietnam.
J Environ Sci Health B. 2020;55(2):103-114. doi: 10.1080/03601234.2019.1674593. Epub 2019 Oct 14.
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.
在这项研究中，研究了二氯膦和吡虫啉与椰子纤维生物废料吸附剂（CF-BWS）之间吸附机制的异同。CF-BWS 是通过在 600°C 下进行 4 小时的慢速热解过程生产的。使用 HCl 酸改性来提高比表面积。通过 SEM、FT-IR、BET 和 pHpzc 分析 CF-BWS 的性质。二氯膦和吡虫啉在 CF-BWS 上的吸附动力学很好地解释了伪二级模型。两种杀虫剂的吸附等温线均遵循 Langmuir 等温线。分子结构和表面化学的差异导致了两种杀虫剂吸附机制的差异。孔填充和疏水力是两种杀虫剂吸附的关键机制。然而，π-π 电子供体-受体相互作用在吡虫啉吸附中起主要作用，但对二氯膦的吸附影响不大。氢键机制在吡虫啉吸附中表现明显，但对二氯膦吸附影响不大。CF-BWS 是一种去除这两种污染物的优异材料，具有很高的潜力可进一步用作水处理过程中的吸附剂。
