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.
Original language | English |
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Pages (from-to) | 7446-7452 |
Number of pages | 7 |
Journal | Journal of Agricultural and Food Chemistry |
Volume | 61 |
Issue number | 31 |
DOIs | |
Publication status | Published - 7 Aug 2013 |
MoE publication type | A1 Journal article-refereed |
Keywords
- chlorpyrifos sorption
- kinetics
- paddy soil
- solution chemistry
- water treatment residuals