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论文类型：期刊论文

发表时间：2013-12-01

发表刊物：Journal of Environmental Chemical Engineering

收录刊物：EI、Scopus

卷号：1

期号：4

页面范围：719-727

ISSN号：22133437

摘要：A high performance photocatalyst was prepared by loading tungstophosphoric acid (H3PW12O40) in hierarchically porous silica. Several kinds of dye pollutants, such as neutral red, rhodamine B and fuchsin basic, were efficiently degraded under visible light irradiation by this catalyst. The hierarchically porous material was characterized via SEM, FT-IR, N2 adsorption-desorption isotherms and X-ray fluorescence spectrometry (XRF). This kind of photocatalyst had a relative large surface area, pore diameter and pore volume. The degradation kinetics and degradation products were also investigated to clarify the degradation process. The dyes could be facilely and quickly bleached and mineralized (ca. 97.80% of removal for fuchsin basic in 80 min), and there were no small organics detected in the main degradation products. Comparing with other porous catalyst carriers (MCM-41 and SBA-15), the hierarchically porous structure was considered to be an important factor to improve the molecular diffusion in the heterocatalysis process and enhance the degradation efficiency. Additionally, this hierarchically porous catalyst was very stable and easy to be separated from the reaction solution for reuse. © 2013 Elsevier Ltd. All rights reserved.