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Photocatalytic degradation of aqueous organocholorine pesticide on the layered double hydroxide pillared by Paratungstate A ion, Mg12Al6(OH)36(W7O24)·4H2O |
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| Authors: | Yihang Guo Danfeng Li Changwen Hu Yonghui Wang Enbo Wang Yongchun Zhou Shouhua Feng |
| Affiliation: | a Institute of Polyoxometalate Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China b Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130023, PR China |
| Abstract: | Layered double hydroxide pillared by Paratungstate A ion, Mg12Al6(OH)36(W7O24)·4H2O, was prepared via anion exchange reaction of the synthetic precursor, Mg4Al2(OH)12TA·xH2O (TA2?=terephthalate), and W7O24]6? ion. Some physico-chemical properties were measured and the preparation conditions were studied. Trace aqueous organocholorine pesticide, hexachlorocyclohexane (HCH), was totally degraded and mineralized into CO2 and HCl by irradiating a Mg12Al6(OH)36(W7O24)·4H2O suspension in the near UV area. Disappearance of trace HCH follows Langmuir–Hinshelwood first-order kinetics. The model and mechanism for the photocatalytic degradation of HCH on the Mg12Al6(OH)36(W7O24)·4H2O were proposed, indicating that the interlayer space is the reaction field, and that photogeneration of OH√ radicals are responsible for the degradation pathway. |
| Keywords: | Heterogeneous photocatalysis Layered double hydroxide Paratungstate A Organochlorine pesticide Anion exchange reaction |
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