MoS2/g-C3N4复合纳米催化剂光催化深度处理造纸废水研究

Advanced Treatment of Papermaking Wastewater by Photocatalysis with MoS2/g-C3N4 Nano-composite Catalyst

关键词:  MoS₂/g-C₃N₄  光催化  造纸废水  深度处理

Key Words:MoS₂/g-C₃N₄  photocatalytic  papermaking wastewater  advanced treatment

摘要:本研究采用N-甲基吡咯烷酮复合MoS₂与g-C₃N₄，制得MoS₂/g-C₃N₄复合纳米催化剂。采用X射线衍射仪（XRD）、X射线光电子能谱仪（XPS）、光致发光光谱仪（PL）和扫描电子显微镜（SEM）对复合纳米催化剂进行表征，并利用MoS₂/g-C₃N₄复合纳米催化剂光催化深度处理造纸废水。结果表明，少量MoS₂与g-C₃N₄复合可提高复合光催化剂的光催化活性，反应时间180 min、pH值5、1.5% MoS₂/g-C₃N₄复合纳米催化剂投加量为2 g/L时，对造纸废水的COD_Cr去除率和色度去除率最高，分别达到63.4%和83.2%。MoS₂/g-C₃N₄的光催化活性有所增强是由于MoS₂与g-C₃N₄的能带结构匹配，降低了光生电子-空穴的复合几率，从而提高了催化剂的光催化活性。

Abstract:The MoS₂/g-C₃N₄ nano-composite catalyst was prepared via combining MoS₂ and g-C₃N₄ by N-methy1-2-pyrrolidone. The prepared nano-composite catalyst was characterized by X-ray diffraction （XRD）， X-ray photoelectron spectroscopy （XPS）， photoluminescence spectroscopy （PL） and scanning electron microscopy（SEM）. The nano-composite catalyst were used to advanced treatment by photocatalysis of papermaking wastewater. The results showed that a few MoS₂ combined with g-C₃N₄ could improve the photocatalytic activity of nano-composite catalyst remarkably. The removal efficiency of COD_Cr and chroma in papermaking wastewater could reach 63.4% and 83.2%，respectively， when react time was 180 min， pH value was 5， dosage of 1.5% MoS₂/g-C₃N₄ was 2 g/L. The enhanced photocatalytic activity of MoS₂/g-C₃N₄ was probably due to the matched band structure between MoS₂ and g-C₃N₄， which could decrease the recombination rate of photo-generated electron and hole to improve the photocatalytic activity of MoS₂/g-C₃N₄ catalyst.