College of Resources and Environment, Northeast Agricultural University, No.600 Changjiang Road, Xiangfang District, Harbin, 150030, China.
Department of Chenghai, Bureau of Social Insurance Fund Administration of Shantou City of Guangdong Province, Building B, Danxia Park, Taixing Road, Shantou, 515000, Chenghai District, China.
Environ Sci Pollut Res Int. 2023 Sep;30(44):99232-99246. doi: 10.1007/s11356-022-23027-3. Epub 2022 Sep 16.
Butachlor (BUT) is a widely used herbicide that can cause environmental problems when used excessively. BUT has been found to exist in large quantities in the water environment so far. As an agricultural pre-emergent herbicide, BUT can enter the water environment through multiple channels and cause pollution. This study investigated the mechanism of three types of microplastics (MPs): polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC) to remove BUT from water. The adsorption behavior between MPs and BUT under different factors, namely pH, salt ion concentration, and aging, was investigated. This study further investigated the desorption and aging of BUT-adsorbed MPs. In this research, the adsorption capacity of BUT by PE, PP, and PVC are 13.65 μg/g, 14.82 μg/g, and 18.88 μg/g, respectively, and the order of carrier effect was: PVC>PP>PE. Experiments show that MPs have low adsorption performance on the microgram level for BUT. The adsorption behavior of PE, PP, and PVC on BUT conformed to pseudo-second-order kinetics, indicating the presence of physical and chemical adsorption. The Langmuir isotherm model fits well, indicating that the adsorption is a single-layer adsorption process. The pH value causes slight fluctuations in the overall carrier effect. Low concentration of salt ions can inhibit the carrier effect, and high concentration will promote the interaction between MPs and BUT. Aging experiments show that the carrier effect of the original materials was higher than the adsorption capacity of hydrogen peroxide and MPs after acid aging, and acid aging can cause the adsorption capacity to drop significantly.
丁草胺（BUT）是一种广泛使用的除草剂，如果过量使用，会对环境造成问题。迄今为止，在水环境中已发现大量存在 BUT。作为一种农业芽前除草剂，BUT 可以通过多种途径进入水环境，造成污染。本研究探讨了三种类型的微塑料（MPs）：聚乙烯（PE）、聚丙烯（PP）和聚氯乙烯（PVC）去除水中 BUT 的机制。研究了不同因素（即 pH 值、盐离子浓度和老化）下 MPs 和 BUT 之间的吸附行为。本研究进一步研究了 BUT 吸附 MPs 的解吸和老化。在这项研究中，PE、PP 和 PVC 对 BUT 的吸附容量分别为 13.65μg/g、14.82μg/g 和 18.88μg/g，载体效应的顺序为：PVC>PP>PE。实验表明，MPs 对 BUT 的吸附性能在微克水平上较低。PE、PP 和 PVC 对 BUT 的吸附行为均符合准二级动力学，表明存在物理和化学吸附。Langmuir 等温模型拟合较好，表明吸附是单层吸附过程。pH 值会导致载体效应略有波动。低浓度的盐离子会抑制载体效应，而高浓度会促进 MPs 和 BUT 之间的相互作用。老化实验表明，原始材料的载体效应高于酸老化后双氧水和 MPs 的吸附容量，酸老化会导致吸附容量明显下降。
