Deng Xiaoming, Chen Yao, Wen Jieya, Xu Yun, Zhu Jian, Bian Zhenfeng
The Education Ministry Key Laboratory of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China.
The Education Ministry Key Laboratory of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China.
Sci Bull (Beijing). 2020 Jan 30;65(2):105-112. doi: 10.1016/j.scib.2019.10.020. Epub 2019 Oct 21.
In order to develop efficient photocatalysts, great efforts have been made to reduce hexavalent chromium to trivalent chromium. The photocatalytic efficiency of this reduction depends largely on the adsorption and diffusion of hexavalent chromium ions on the surface of the photocatalyst. In this paper, polyaniline-TiO composite can effectively improve the photocatalytic reduction performance and stability of hexavalent chromium ion. The effect of polyaniline (PANI) thickness on Cr(VI) activity and stability of photocatalytic reduction was studied by adjusting the content of PANI on Mesoporous TiO (MT) surface. Under the irradiation conditions, the reaction results showed that the reduction rate was 100%, and the maximum reaction rate reached 0.62 min when the PANI modification was 3.0%. Moreover, the results showed that the reduction performance remained 100% after ten cycles. The main reason is that the PANI modified on the surface of TiO is rich in positively charged amino group, which can efficiently adsorb the reactant Cr(VI), and make the product Cr(III) leave the reaction interface quickly, thus ensuring the performance of photocatalyst.
为了开发高效的光催化剂，人们已经做出了巨大努力将六价铬还原为三价铬。这种还原反应的光催化效率在很大程度上取决于六价铬离子在光催化剂表面的吸附和扩散。本文中，聚苯胺-TiO复合材料能够有效提高六价铬离子的光催化还原性能和稳定性。通过调节介孔TiO（MT）表面聚苯胺（PANI）的含量，研究了聚苯胺厚度对Cr（VI）光催化还原活性和稳定性的影响。在光照条件下，反应结果表明，当聚苯胺修饰量为3.0%时，还原率为100%，最大反应速率达到0.62 min⁻¹。此外，结果表明，经过十次循环后，还原性能仍保持100%。主要原因是修饰在TiO表面的聚苯胺富含带正电荷的氨基，能够有效吸附反应物Cr（VI），并使产物Cr（III）迅速离开反应界面，从而保证了光催化剂的性能。
