Bi2Sn2O7的合成及其光催化性能

doi:10.15541/jim20140236

摘要/Abstract

摘要：

Bi₂Sn₂O₇是一种特殊的烧绿石结构复杂氧化物, 具有可见响应光催化性能, 其带隙约为2.61 eV。采用水热法合成出棒状Bi₂Sn₂O₇和颗粒组成的球形Bi₂Sn₂O₇光催化材料, 发现通过改变反应物的添加次序, 可以产生不同的成核形式, 从而导致产物的最终形貌不同。在可见光激发下, 以罗丹明B为目标降解物进行了产物光催化性能的表征。由纳米颗粒组成的球状Bi₂Sn₂O₇表现出更强的光催化性能, 100 min时降解率达98%。通过光催化过程中的自由基淬灭反应, 发现Bi₂Sn₂O₇降解有机污染物的主要活性物种为超氧自由基和空穴。

关键词: Bi2Sn2O7, 可见光, 水热合成, 光催化

Abstract:

Bi₂Sn₂O₇ photocatalysts with rods and microspheres composed of particles were successfully synthesized via a facile hydrothermal route. Adding order change of the raw materials resulted in different forms of nucleation, thus affected the final morphology of the products. The as-prepared Bi₂Sn₂O₇ was a special kind of complex oxide with pyrochlore structure, which possessed visible photocatalytic performance with the band gap of 2.61 eV. Photocatalytic activities of the products were evaluated by degradation of RhB under visible light. Bi₂Sn₂O₇ exhibited high Photocatalytic activities with degradation rate of 98% within 100 min. Particularly, microsphere shaped Bi₂Sn₂O₇ composed of particles possessed higher photocatalytic activities. Under condition of different free radicals quenchers, ·O₂^- and h⁺ were recognized as primary active species responsible for RhB degradation.

Key words: Bi2Sn2O7, visible light, hydrothermal synthesis, photocatalysis

中图分类号:

O643

高二平, 王文中. Bi₂Sn₂O₇的合成及其光催化性能[J]. 无机材料学报, 2015, 30(1): 87-92.

GAO Er-Ping, WANG Wen-Zhong. Synthesis and Visible-light Photocatalytic Activities of Bi₂Sn₂O₇[J]. Journal of Inorganic Materials, 2015, 30(1): 87-92.

图/表 6

图 1 合成的颗粒锡酸铋和棒状锡酸铋样品的XRD图谱

Fig. 1 XRD patterns of as-prepared Bi2Sn2O7-particle and Bi2Sn2O7-rod samples

图 2 γ-Bi2Sn2O7样品的紫外可见漫反射光谱

Fig. 2 UV-visible diffuse reflectance spectra of γ-Bi2Sn2O7 products. Inset: plots of (αhυ)2 versus photon energy (hυ)

图 3 棒状锡酸铋样品(a, b)和颗粒锡酸铋样品(c, d)的SEM照片

Fig. 3 SEM images of Bi2Sn2O7-rod samples (a and b) and Bi2Sn2O7-particle samples (c and d)

图 4 不同光催化材料作用下RhB的降解随光照时间的变化

Fig. 4 Photocatalytic degradation of RhB as a function of irradiation time by different photocatalysts

图 5 不同捕获剂对光催化降解RhB的影响

Fig. 5 Effect of different scavengers on the photocatalytic degradation of RhB

图 6 Bi2Sn2O7晶体结构示意图(a), Bi3+离子环境示意图(b), Bi原子配位环境(c)和Sn原子配位环境(d)

Fig. 6 Schematic structure of Bi2Sn2O7 (a), diagrammatic representation of Bi3+ cation environments (b), coordination environment around Bi atom (c) and coordination environment around Sn atom (d)

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Bi₂Sn₂O₇的合成及其光催化性能

Synthesis and Visible-light Photocatalytic Activities of Bi₂Sn₂O₇

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