BiOCl/MWCNTs复合催化剂对罗丹明B光催化降解研究

以B(iNO3)3.5H2O和NaCl为原料,多壁碳纳米管(MWCNTs)为载体,水解法合成碳纳米管负载氯氧化铋复合型光催化剂(BiOCl/MWCNTs)。通过TEM、XRD、UV-Vis对催化剂的微观形貌、主要成分和光学吸收进行了表征,并以500 W氙灯为可见光光源,研究了其对罗丹明B的光催化降解能力。TEM和XRD结果表明,复合催化剂中BiOCl成块状与MWCNTs结合,粒径小,分散好;UV-Vis则显示,BiOCl/MWCNTs对420⁷80 nm波长段的光的吸收强于BiOCl,有利于可见光催化。光照2.5 h后,BiOCl和BiOCl/MWCNTs对罗丹明B的降解率分别达到78%和96%。BiOCl/MWCNTs对罗丹明B光催化反应符合一级反应动力学特征,速率常数为1.23 h-1,相比BiOCl提高了98.2%。

Photocatalytic Degradation of Rhodamine B Using BiOCl Photocatalyst Combined with Multi-walled Carbon Nanotubes

Composites of BiOCl and multi-walled carbon nanotubes(BiOCl/MWCNTs)were prepared via hydrolysis of bismuth nitrate pentahydrate and sodium chloride using MWCNTs as carriers.The morphology,main composition and optical properties of catalysts were characterized by TEM,XRD and UV-Vis.The photocatalytic activity of BiOCl/MWCNTs was assessed from the degradation of Rhodamine B under visible light of Xe-lamp with power of 500 W.Results of TEM and XRD showed that the size of BiOCl coated on MWCNTs was smaller than that of pure BiOCl,without obvious agglomeration of BiOCl particles.UV-Vis spectra indicated that BiOCl / MWCNTs had a higher absorbability in the wavelength of 420 ~780 nm than BiOCl,which contributed to photocatalysis exposed to visible light.After being exposed under visible light for 2.5 h,there was 96% of Rhodamine B degraded with BiOCl/MWCNTs while 78% of Rhodamine B degraded with BiOCl.The photocatalytic reaction between BiOCl/MWCNTs and Rhodamine B corresponded with the first order kinetic characteristics,with rate constant 1.23 h-1,which was increased by 98.2% compared to that with BiOCl.