Remediating thiacloprid-contaminated soil utilizing straw biochar-loaded iron and manganese oxides activated persulfate: Removal effects and soil environment changes

• Published in: Journal of hazardous materials 2023-10, Vol.459, p.132066-132066, Article 132066
• Main Authors: Li, Jie, Guo, Zhi, Cui, Kangping, Chen, Xing, Yang, Xue, Dong, Dazhuang, Xi, Shanshan, Wu, Zhangzhen, Wu, Feiyan
• Format: Article
• Language: English
• Subjects: agricultural soils; Biochar; edaphic factors; genus; iron; Iron and manganese oxides; manganese; microbial communities; Persulfate; potassium; remediation; Soil remediation; straw; temperature; Thiacloprid; urease
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2023.132066

Thiacloprid (THI) has accumulated significantly in agricultural soil. Herein, a novel approach to removing THI was explored by straw biochar-loaded iron and manganese oxides (FeMn@BC) to activate the persulfate (PS). The factors influencing the removal of 5 mg kg−1 THI from the soil by FeMn@BC/PS were investigated, including FeMn@BC dosing, PS dosing, temperature, and soil microorganisms. The feasibility was demonstrated by the 75.22% removal rate of THI with 3% FeMn@BC and 2% PS at 7 days and a 92.50% removal rate within 60 days. Compared to the THI, NH4+-N and available potassium were 3.96 and 3.25 times, and urease and phosphatase activities were increased by 22.54% and 33.28% in the FeMn@BC/PS at the 15 days, respectively. THI was found to seriously alter the structure of the genus in the 15 days by 16 S rRNA analysis; however, the FeMn@BC/PS group alleviated the damage, compared to the THI with 658 more operational taxonomic units. Actinobacteriota accounted for 51.48% of the microbial community in the FeMn@BC/PS group after 60 days, possibly converting transition products of THI into smaller molecules. This article provides a novel insight into advanced oxidative remediation of soils. [Display omitted] •THI was efficiently removed from soil by activating persulfate with FeMn@BC.•The pyridine ring of THI was opened to produce small molecules.•Soil nutrient elements and microbial activity were increased after FeMn@BC/PS treatment.•The microbial community was insignificantly affected in the 15 d of the FeMn@BC/PS.