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由于宽带隙、不能吸收可见光以及光生载流子易复合等问题限制了二氧化钛(TiO2)在光催化领域的应用。为了提升TiO2光催化活性,首先通过电化学还原法将TiO2自掺杂成为黑色TiO2,将其吸收光谱从紫外光扩展到可见光。然后,引入二硫化钼(MoS2)纳米颗粒构建自掺杂TiO2/MoS2异质结抑制光生载流子复合,提升其能量转换效率。同时,优化MoS2纳米颗粒质量比(2%、3%、5%和7%),进一步提升复合物光催化性能。实验结果表明:掺杂质量分数5%的MoS2的黑色P25-TiO2/MoS2复合物光催化性能最佳,30 min内可降解质量分数97%的RhB,而自掺杂的黑色TiO_260 min仅降解质量分数91%的RhB。因此,构建掺杂TiO2/MoS2异质结能明显提升整体性能。
Abstract：Due to the wide band-gap,inability to absorb visible light and easy recombination of photo-generated carriers the application of titanium dioxide(TiO2)in the field of photocatalysis is limited.In order to enhance the photocatalyst activity of TiO2,TiO2 was self-doped to black TiO2 by the electrochemical reduction method and its absorption spectrum was extended from ultraviolet to visible light.Then,MoS2 nanoparticles were introduced to build a self-doped TiO2/MoS2 heterojunction to suppress the photo-generated carrier recombination and improve its energy conversion efficiency.At the same time,the mass ratio of MoS2 nanoparticles(2%,3%,5% and7%)was optimized to further improve the photocatalytic performance of the composite.The experimental results show that the black P25-TiO2/MoS2 composite doped with MoS2 of the 5%mass fraction has the best photocatalytic performance,degrading 97% mass fraction of RhB in30 min,and the black self-doped TiO2 only degrades 91% mass fraction of RhB in60 min.Therefore,the construction of doped TiO2/MoS2 heterojunction can significantly improve the overall performances.
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基本信息:
DOI：10.13250/j.cnki.wndz.2020.07.002
中图分类号:X505;O643.36;O644.1
引用信息:
[1]安维亮,张文磊,李廷鱼,等.黑色TiO_2/MoS_2的制备改性及其光催化性能[J].微纳电子技术,2020,57(07):514-520.DOI:10.13250/j.cnki.wndz.2020.07.002.
基金信息:
国家自然科学基金资助项目(61674113,51622507,61471255);; 山西省自然科学基金资助项目(201901D111099,2016011040);; 山西省高校科技创新研究项目(2016138)
2020-06-28
2020-06-28