Feasibility of Using Drinking Water Treatment Residuals as a Novel Chlorpyrifos Adsorbent

• Published in: Journal of agricultural and food chemistry Vol. 61; no. 31; pp. 7446 - 7452
• Main Authors: Zhao, Yuanyuan, Wang, Changhui, Wendling, Laura A, Pei, Yuansheng
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 07.08.2013
• Subjects: absorbents; adsorbents; Adsorption; Biological and medical sciences; chlorpyrifos; Chlorpyrifos - chemistry; Drinking Water - chemistry; Environmental Restoration and Remediation - methods; Food industries; Fundamental and applied biological sciences. Psychology; Insecticides - chemistry; ionic strength; Kinetics; molecular weight; organic acids and salts; organic matter; paddy soils; sorption; sorption isotherms; Waste Products - analysis; Water Purification - instrumentation; water treatment; paddy soil; water treatment residuals; solution chemistry; chlorpyrifos sorption; kinetics; Chlorpyrifos; Drinking water; Water treatment; Insecticide; Pesticides; Sorption; Soils; Chemistry; Feasibility; Kinetics; Adsorbent; Solution
• ISSN: 0021-8561; 1520-5118
• DOI: 10.1021/jf401763f

Recent efforts have increasingly focused on the development of low-cost adsorbents for pesticide retention. In this work, the novel reuse of drinking water treatment residuals (WTRs), a nonhazardous ubiquitous byproduct, as an adsorbent for chlorpyrifos was investigated. Results showed that the kinetics and isothermal processes of chlorpyrifos sorption to WTRs were better described by a pseudo-second-order model and by the Freundlich equation, respectively. Moreover, compared with paddy soil and other documented absorbents, the WTRs exhibited a greater affinity for chlorpyrifos (log K oc = 4.76–4.90) and a higher chlorpyrifos sorption capacity (K F = 5967 mg1–n ·L·kg–1) owing to the character and high content of organic matter. Further investigation demonstrated that the pH had a slight but statistically insignificant effect on chlorpyrifos sorption to WTRs; solution ionic strength and the presence of low molecular weight organic acids both resulted in concentration-dependent inhibition effects. Overall, these results confirmed the feasibility of using WTRs as a novel chlorpyrifos adsorbent.