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采用超声振荡法制备CuO掺杂TiO_2光催化剂,并用分光光度法研究了其在紫外灯下光催化降解孔雀石绿溶液的性能。主要考察了CuO的掺杂比例、催化剂的烧结温度、孔雀石绿溶液的初始浓度、催化剂的投加量等因素对光催化降解孔雀石绿效果的影响。实验结果表明:CuO的最佳掺杂比例为1.2wt.%;催化剂的最佳煅烧温度为600℃;孔雀石绿溶液的最佳初始浓度为8 mg/L;催化剂的最佳用量为0.40g/L。紫外-可见吸收光谱图显示,孔雀石绿分子中的发色基团及其他基团被破坏,发生脱色降解。催化剂的XRD表征结果说明,CuO掺杂后没有改变TiO_2的晶型结构,但其结晶度有所提高,颗粒变小,相对比表面积增大,有利于改善光催化性能。
The CuO-doped TiO_2 photocatalyst was prepared by ultrasonic vibration method and the photocatalytic degradation of malachite green solution under ultraviolet light was studied by spectrophotometry. The effects of photocatalytic degradation of malachite green on photocatalytic degradation were mainly investigated such as the doping ratio of CuO, the sintering temperature of catalyst, the initial concentration of malachite green solution and the dosage of catalyst. The experimental results show that the best doping ratio of CuO is 1.2wt.%, The optimal calcination temperature is 600 ℃, the optimal initial concentration of malachite green solution is 8mg / L, the optimal dosage of catalyst is 0.40g / L. UV-Vis absorption spectra showed that the chromophore and other groups in the malachite green molecule were destroyed and decolorized and degraded. The results of XRD characterization showed that the crystal structure of TiO_2 did not change after CuO doping, but its crystallinity was increased, the particles became smaller and the specific surface area increased, which was in favor of improving the photocatalytic performance.