Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Materials and Chemical Engineering, Hainan University, 58 Renmin Road, Haikou 570228, Hainan Province, China.
Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Materials and Chemical Engineering, Hainan University, 58 Renmin Road, Haikou 570228, Hainan Province, China.
J Environ Sci (China). 2019 Apr;78:230-238. doi: 10.1016/j.jes.2018.09.025. Epub 2018 Oct 10.
The effects of amphiphilic O/W emulsions, stabilized by the alkyl polyglycoside (APG) or cholesterol-grafted sodium alginate (CSAD)/APG systems, on lambda-cyhalothrin adsorption/desorption mechanisms on natural soil minerals (i.e., illite and kaolinite) were investigated. Sorption and desorption of lambda-cyhalothrin onto soil minerals was studied via batch equilibration to give insight into the adsorption equilibrium, kinetics, and thermodynamics of lambda-cyhalothrin adsorption onto minerals. The results indicate the following: (i) The adsorption processes for the APG system and CSAD/APG system include: rapid adsorption, slow adsorption, and adsorption equilibrium. The adsorption kinetics of pesticide on illite and kaolinite are in accordance with the Ho and McKay model, and the adsorption isotherm conforms to the Freundlich model. In addition, the adsorption processes of pesticide for the two systems on minerals were spontaneous and feasible (ΔG < 0), endothermic (ΔH > 0), and mainly involved chemical bonding (ΔH > 60). (ii) The equilibrium adsorption percentages of the pesticide on illite for the APG system and CSAD/APG system were 42.4% and 64.8%, and the corresponding equilibrium adsorption percentages on kaolinite were 40.8% and 61.8%, respectively. Moreover, the pesticide adsorption rate K was faster than K, and its adsorption capacity K was greater than K. Meanwhile, the pesticide desorption K in the CSAD/APG system was smaller than that in the APG system. As a result, this eco-friendly O/W emulsion based on amphiphilic sodium alginate derivatives might provide a green pesticide formulation, since it could reduce the amount of lambda-cyhalothrin entering aquatic systems to threaten non-target fish and invertebrate species.
研究了由烷基糖苷（APG）或胆固醇接枝海藻酸钠（CSAD）/APG 稳定的两亲性 O/W 乳液对天然土壤矿物质（即伊利石和高岭石）上氯氟氰菊酯吸附/解吸机制的影响。通过批量平衡研究了氯氟氰菊酯在土壤矿物质上的吸附和解吸，以深入了解氯氟氰菊酯在矿物质上的吸附平衡、动力学和热力学。结果表明：（i）APG 体系和 CSAD/APG 体系的吸附过程包括：快速吸附、缓慢吸附和吸附平衡。农药在伊利石和高岭石上的吸附动力学符合 Ho 和 McKay 模型，吸附等温线符合 Freundlich 模型。此外，两个体系中农药在矿物上的吸附过程是自发且可行的（ΔG < 0），是吸热的（ΔH > 0），主要涉及化学键合（ΔH > 60）。（ii）APG 体系和 CSAD/APG 体系中农药在伊利石上的平衡吸附百分比分别为 42.4%和 64.8%，在高岭石上的相应平衡吸附百分比分别为 40.8%和 61.8%。此外，农药吸附速率 K 快于 K，其吸附容量 K 大于 K。同时，CSAD/APG 体系中农药的解吸 K 小于 APG 体系中的 K。因此，这种基于两亲性海藻酸钠衍生物的环保 O/W 乳液可能为提供一种绿色农药制剂，因为它可以减少进入水生系统的氯氟氰菊酯的量，以威胁非目标鱼类和无脊椎动物物种。
