Preparation of H3PW12O40/MCM-48 and Its Photocatalytic Degradation of Pesticides
LIU Xia1, LI Yan-zhou2, GAN Qiang2, FENG Chang-gen2
1. College of Science, China Agricultural University, Beijing 100193, China 2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Abstract：A composite catalyst H3PW12O40/MCM-48 was prepared by loading photocatalyst phosphotungstic acid H3PW12O40 (HPW) to molecular sieve MCM-48 by impregnation method, and its structure was characterized by Fourier transform infrared (FT-IR) spectra, small angle X-ray diffraction (XRD) patterns, nitrogen adsorption analysis and High-resolution transmission electron microscopy (HRTEM) analysis. Photocatalytic degradation activities of HPW/MCM-48 against pesticides imidacloprid and paraquat were evaluated under UV radiation (365 nm). The results show that HPW/MCM-48 maintains the mesoprous molecular sieve structure of MCM-48 and the Keggin structure of HPW, while the BET surface area is 793.35 m2·g-1, pore volume is 1.46 cm3·g-1, average pore diameter is 2.76 nm, suggesting loading HPW on MCM-48 is a considerable way to improve its surface area. After 14 h UV irradiation (365 nm), 57.38% imidacloprid and 63.79% paraquat were degraded by 20 mg HPW/MCM-48 catalyst, while HPW and blank group degraded the two pesticides at the degradation rate of about 25% and 5%, respectively. Implying loading on MCM-48 could greaterly improve the degradation activity of HPW. The reslut of degradation kinetics show that, the degradation process of HPW/MCM-48 fits first order kinetics equation. The rate constant Ka of HPW/MCM-48 toward imidacloprid and paraquat are 0.089 h and 0.117 h, with the half-life t1/2 of 7.8 h and 5.9 h, respectively.
刘 霞1，李彦周2，甘 强2，冯长根2 . H3PW12O40/MCM-48的制备及其光催化降解农药 [J]. 光谱学与光谱分析, 2014, 34(08): 2157-2161.
LIU Xia1, LI Yan-zhou2, GAN Qiang2, FENG Chang-gen2 . Preparation of H3PW12O40/MCM-48 and Its Photocatalytic Degradation of Pesticides. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(08): 2157-2161.
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