Controllable preparation of three-dimensional porous WO 3 with enhanced visible light photocatalytic activity via a freeze-drying method
作者： Wei Sun , Xiaowei Li , Changlu Shao , Xinghua Li , Ling Zhao
DOI: 10.1007/S10854-018-8996-1
关键词: Porosity 、 Polyvinyl alcohol 、 Rhodamine B 、 Materials science 、 Photocatalysis 、 Phosphotungstic acid 、 Chemical engineering 、 Calcination 、 Aqueous solution 、 Photodegradation
摘要: Three dimensional porous WO3 was fabricated by a novel freeze-drying method using polyvinyl alcohol (PVA)/phosphotungstic acid (H3PW12O40) aqueous solution as the precursor followed calcination. Results revealed that interconnected structures have channels of 3–10 µm and wall thicknesses about 0.68 µm. Interestingly, morphology structure samples can be well controlled amount PVA calcination temperature. To further demonstrate their potential application in photocatalysis, photocatalytic activities for photodegradation Rhodamine B under visible light irradiation were investigated. It found highest activity obtained sample which prepared fixing addition at 7.5% (relative to solvent) temperature 800 °C. The enhanced performance attributed combined effects increased surface area, macroporous crystal quality.
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