Synthesis of surface sulfated BiWO with enhanced photocatalytic performance.
Synthesis of surface sulfated BiWO with enhanced photocatalytic performance.
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DOI：
10.1016/s1001-0742(11)61061-9
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发表时间：
2012-12
影响因子：
6.9
通讯作者：
Yongming Ju;Jianming Hong;Xiuyu Zhang;Zhencheng Xu;Dongyang Wei;Y. Sang;Xiao-hang Fang;Jiande Fang;Zhenxing Wang
中科院分区：
文献类型：
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作者：
Yongming Ju;Jianming Hong;Xiuyu Zhang;Zhencheng Xu;Dongyang Wei;Y. Sang;Xiao-hang Fang;Jiande Fang;Zhenxing Wang
为提高BiWO(BiWO)的可见光驱动光催化活性，采用浸渍法制备了硫酸化BiWO(SBiWO)。表征结果表明，硫酸盐阴离子主要锚定在催化剂表面，在不破坏晶格的前提下大大扩展了可见光响应范围。此外，通过两个微波无极放电灯(MPEDL−2)和可见光(λ>；420 nm)发射的UV-Vis照射下孔雀石绿(MG)的去除来评价基于SBiWO的光催化活性。结果表明，动力学常数从0.1478(BiWO)增加到0.3328 m in−-1(SBiWO-1)，增加了2.25倍。可见光驱动反应也得到了类似的结果。此外，叔丁醇等自由基清除剂抑制了BiWO和SBiWO-1对可见光诱导的MG的降解。这表明硫酸盐化过程增加了活性氧物种的产生，这一点被水杨酸分子探针进一步证实。因此，在λ=618 nm处观察到了更多的蓝移。在此基础上，探讨了硫酸盐化催化剂的光催化机理。
Sulfated BiWO (SBiWO) was synthesized by an impregnation method to enhance the visible-light-driven photoactivities of BiWO (BiWO). The characterization results verified that sulfate anion mainly anchored on the catalyst surface greatly extended the visible-light-responsive range without destroying the crystal lattice. Moreover, the SBiWO-based photoactivities were evaluated with the removal of Malachite Green (MG) under UV-Vis irradiation emitted from two microwave-powered electrodeless discharge lamps (MPEDL−2) and under visible light (λ > 420 nm). The results demonstrated that the kinetic constant was increased 2.25 times, varying from 0.1478 (BiWO) to 0.3328 min−1(SBiWO-1). Similar results were also obtained for the visible light-driven reaction. Furthermore, radical scavengers such as t-butanol restricted the visible-light induced degradation of MG over BiWO and SBiWO-1. This indicated that the sulfating process increased the generation of reactive oxygen species, which was further verified by molecular probe with salicylic acid. Thus, more blue-shifting at λ = 618 nm was observed over SBiWO. On the basis of the above results, the photocatalytic mechanism over the sulfated catalyst was also discussed.