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Indexed by:期刊论文

Date of Publication:2009-08-12

Journal:JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

Included Journals:SCIE、PubMed、Scopus

Volume:57

Issue:15

Page Number:6927-6931

ISSN No.:0021-8561

Key Words:Humic acids; molecularly imprinted polymers; phthalocyanine; photodegradation; 2,4-dichlorophenoxyacetic acid

Abstract:To elucidate the existence of phthalocyanine-like (Pc-like) substances in humic acids (HA) and their roles in photochemical transformation of organic pollutants, Pc-imprinted polymers (MIP) were synthesized successfully and employed to separate Pc-like substances from HA. The fraction bound by MIP (F(mip-b)) presented better photochemical activity for degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) in aqueous solution irradiated by simulated sunlight. The pseudo-first-order rate constant of 2,4-D photodegradation with the presence of F(mip-b) was 2.5 times as high as that in solution containing effluent fraction (F(eff)). These results show the key role of some HA with special structures in photochemistry and are helpful for better understanding phototransformation of environmental contaminants in natural aquatic systems.