Controllable Preparation and Photocatalytic Properties of Three-dimensional Porous Zinc-tungsten Oxide Heterojunctions †

doi:10.7503/cjcu20190286

Abstract

Abstract:

The zinc and tungsten oxides and their heterojunctions were controllably prepared by adjusting the precursor compositions using a vacuum freeze-drying technology. Owing to the introduction of a polymer in the precursor, the calcined oxide materials could maintain their three-dimensional connected porous structures. The photocatalytic experiments showed that the obtained series of materials could achieve the decolorization degradation of Rhodamine B and exhibit component-dependent photocatalytic activity. The zinc oxide/zinc tungstate three-dimensional porous heterojunctions showed higher photocatalytic activity than the other samples, which could completely decolorize Rhodamine B within 180 min.

Key words: Vacuum freeze-drying, Three-dimensional porous material, Zinc-tungsten oxide, Hetero-structure, Photocatalysis, Rhodamine B

CLC Number:

O643.3

LIU Meihong, TAO Ran, LI Bing, LI Xinghua, HAN Chaohan, LI Xiaowei, SHAO Changlu. Controllable Preparation and Photocatalytic Properties of Three-dimensional Porous Zinc-tungsten Oxide Heterojunctions ^†[J]. Chemical Journal of Chinese Universities, 2019, 40(11): 2367-2374.

Figures/Tables 12

Fig.1 XRD patterns of WO3, WO3/ZnWO4, ZnWO4, ZnO/ZnWO4 and ZnO

Fig.2 SEM images of WO3/ZnWO4(A, B) and ZnO/ZnWO4(C, D) before(A, C) and after(B, D) heat treatment

Fig.3 TEM(A) and corresponding HRTEM(B) images of WO3/ZnWO4, TEM(C) and corresponding HRTEM(D) images of ZnO/ZnWO4

Fig.4 TG curves of the samples before heat treatment

Fig.5 N2 adsorption-desorption isotherm and pore-size distributions(insets) of WO3(A), WO3/ZnWO4(B), ZnWO4(C), ZnO/ZnWO4(D), ZnO(E) and specific surface area of the samples(F) a. Adsorption; b. desorption.

Fig.6 XPS spectra of WO3, WO3/ZnWO4, ZnWO4, ZnO/ZnWO4 and ZnO (A) Full spectrum; (B) Z n 2 p core level; (C) W 4 f core level.

Fig.7 UV-Vis absorption spectra of WO3, WO3/ZnWO4, ZnWO4, ZnO/ZnWO4 and ZnO

Fig.8 Photocurrent spectra(A) and PL spectra(B) of WO3, WO3/ZnWO4, ZnWO4, ZnO/ZnWO4 and ZnO

Fig.9 Photocatalytic degradation of RhB with different samples under simulated sunlight

Fig.10 Effects of scavengers for photodegradation of RhB with WO3/ZnWO4(A) and ZnO/ZnWO4(C) under simulated sunlight and ESR spectra of DMPO-·O2- and DMPO-·OH with WO3/ZnWO4(B) and ZnO/ZnWO4(D) before and after simulated sunlight irradiation

Fig.11 Schematic diagram of the energy band positions of zinc-tungsten oxides

Fig.12 Degradation cycling test of RhB with ZnO/ZnWO4 under simulated sunlight

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