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Feasibility of Using Drinking Water Treatment Residuals as a Novel Chlorpyrifos Adsorbent
- Zhao, Yuanyuan, Wang, Changhui, Wendling, Laura
A., Pei, Yuansheng
- Journal of agricultural and food chemistry 2013 v.61 no.31 pp. 7446-7452
- absorbents, adsorbents, chlorpyrifos, ionic strength, molecular weight, organic acids and salts, organic matter, pH, paddy soils, sorption, sorption isotherms, water treatment
- 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 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.