title: Feasibility of using drinking water treatment residuals as a novel chlorpyrifos adsorbent.
abstract: 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 Koc = 4.76-4.90) and a higher chlorpyrifos sorption capacity (KF = 5967 mg(1-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.
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University , Beijing 100875, People's Republic of China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Changhui
authors.initials: C
authors.lastname: Wang
authors.forename: Laura A
authors.initials: LA
authors.lastname: Wendling
authors.forename: Yuansheng
authors.initials: Y
authors.lastname: Pei
mesh_terms: D000327:Adsorption; D004390:Chlorpyrifos / Q000737:chemistry*; D060766:Drinking Water / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007306:Insecticides / Q000737:chemistry*; D007700:Kinetics; D014866:Waste Products / Q000032:analysis*; D018508:Water Purification / Q000295:instrumentation*
chemical_list: D060766:Drinking Water; D007306:Insecticides; D014866:Waste Products; D004390:Chlorpyrifos