Polyaniline (PANI) was adopted to modify SnO₂ nanoparticles for developing a promising high efficiency visible light-driven photocatalyst for the treatment of Cr(VI)-polluted wastewaters. PANI modified SnO₂ nanoparticles (SnO₂/PANI nanocomposites) were synthesized via the following procedures: (i) SnO₂ nanoparticles were synthesized by hydrothermal treatment of SnCl₄·5H₂O in deionized water at 200 °C for 15 h; and (ii) adsorption of PANI in N,N-Dimethylformamide solution by SnO₂ nanoparticles, then evaporation of N,N-Dimethylformamide. The compositions, structures, optical and photoelectrochemical properties of SnO₂/PANI nanocomposites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, high resolution transmission electron microscopy, UV–vis diffuse reflectance spectra, photocurrents measurements and electrochemical impedance spectra. The photocatalytic tests showed that SnO₂/PANI nanocomposites had far higher photocatalytic activity than SnO₂ nanoparticles in the reduction of aqueous Cr(VI) under visible light (λ > 420 nm) irradiation (for example, the reaction rate constant for photocatalytic reduction of Cr(VI) by the most efficient SnO₂/PANI-3% was about 23 times that by SnO₂). Besides, the effects of photocatalytic experiment parameters (including dosage of photocatalyst, initial concentration and pH of Cr(VI) aqueous solution, and coexistent anions and cations) on the Cr(VI) removal rate by SnO₂/PANI-3% were also investigated.

聚苯胺（PANI）被用来修饰SnO ₂纳米粒子，以开发一种有前途的高效可见光驱动的光催化剂，用于处理Cr（VI）污染的废水。通过以下步骤合成PANI改性的SnO ₂纳米颗粒（SnO ₂ / PANI纳米复合材料）：（i）通过在去离子水中在200°C的条件下对SnCl ₄ ·5H ₂ O进行水热处理15 h来合成SnO ₂纳米颗粒。（ii）通过SnO ₂纳米颗粒将PANI吸附在N，N-二甲基甲酰胺溶液中，然后蒸发N，N-二甲基甲酰胺。SnO ₂的组成，结构，光学和光电化学性质/ PANI纳米复合材料的特征在于X射线衍射，X射线光电子能谱，傅里叶变换红外光谱，高分辨率透射电子显微镜，UV-vis漫反射光谱，光电流测量和电化学阻抗谱。光催化试验表明，SnO ₂ / PANI纳米复合材料在可见光（λ> 420 nm）辐射下，Cr（VI）水溶液的还原反应具有比SnO ₂纳米粒子高得多的光催化活性（例如，光催化还原Cr的反应速率常数）。最有效的SnO ₂ / PANI-3％的Cr（VI）约为SnO _2的23倍）。此外，光催化实验参数（包括光催化剂的用量，Cr（VI）水溶液的初始浓度和pH值以及共存的阴离子和阳离子）对SnO ₂ / PANI-3％去除Cr（VI）的影响也受到影响。调查。