Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 61, Issue 31, Pages 7446-7452Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf401763f
Keywords
chlorpyrifos sorption; kinetics; water treatment residuals; paddy soil; solution chemistry
Funding
- National Natural Science Foundation of China [51278055, 51179008]
- National Key Technology RD Program [2012BAJ21B08]
- National Public Benefit (Environmental) Research Foundation of China [201109009]
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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 mg(1-n)center dot L center dot 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.
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