Enhancing soil aggregation and acetamiprid adsorption by ecofriendly polysaccharides hydrogel based on Ca^(2+)-amphiphilic sodium alginate  

作　　者：Siqi Zhang Furui He Xiuqin Fang Xinyu Zhao Yuanyuan Liu Gaobo Yu Yang Zhou Yuhong Feng Jiacheng Li 

机构地区：[1]Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education and School of Chemical Engineering and Technology,Hainan University,Hainan 570228,China

出　　处：《Journal of Environmental Sciences》2022年第3期55-63,共9页环境科学学报（英文版）

基　　金：suppoted by the Key Projects in the Hainan provincial Science&Technology Program(No.ZDYF2020191);the National Natural Science Foundation of China(Nos.22068011,22007025);the Natural Science Foundation of Hainan Province(Nos.220MS006,220QN182);the Start-up Grants from Hainan University(Nos.KYQD(ZR)20041,KYQD(ZR)20040).

摘　　要：Soil aggregation plays an important role in agricultural production activities.However,the structure of soil aggregation is destroyed by the natural environment and unreasonable farming management,resulting in the loss of water,fertilizers and pesticides in soil.At present,hydrogels have been widely reported to promote the formation of soil aggregation.In this paper,amphiphilic calcium alginate(ASA/Ca^(2+))was applied to promote the formation of soil aggregation and enhance pesticide retention.Initially,an ASA was obtained through the one-pot Ugi condensation(a four-component green chemical reaction).Then,ASA/Ca^(2+) hydrogel is prepared by Ca^(2+) cross-linking.The formation of soil aggregation was determined through the Turbiscan Lab Expert stability analyzer,Confocal Laser Scanning Microscope(CLSM),and Transmission Electron Microscope(TEM).And the effect of soil aggregation on acetamiprid environmental behavior was investigated by adsorption kinetics,adsorption isotherms,and leaching.The results shown that the three-dimensional network structure of ASA/Ca^(2+) hydrogel can promote the formation of soil aggregation.Aggregate durability index(ADI)was 0.55 in the presence of ASA/Ca^(2+) hydrogel,indicating that amphiphilic hydrogel can enhance the stability of soil aggregation.The adsorbing capacity of acetamiprid was 1.58 times higher than pure soil,and the release of acetamiprid only about 20%in the presence of ASA/Ca^(2+) hydrogel.These results would be helpful for the formation of soil aggregation and pesticides adsorption on soil aggregation.Thus,ASA/Ca^(2+) hydrogel is likely to improve soil quality,simultaneously it can minimize the mobility of pesticides in the agricultural system.

关 键 词：Soil aggregation AMPHIPHILIC Hydrogel network Pesticides migration 

分 类 号：X131.3[环境科学与工程—环境科学] TQ427.26[化学工程] O647.3[理学—物理化学]