欢迎访问过程工程学报, 今天是

›› 2012, Vol. 12 ›› Issue (1): 142-147.

• 材料工程专栏 • 上一篇    下一篇

Ag@AgCl-TiO2-粉煤灰微珠复合光催化剂的制备及其可见光光催化性能

郭凌坤 吕珺 周嵩 汪冬梅 徐光青 郑治祥 吴玉程   

  1. 合肥工业大学材料科学与工程学院 合肥工业大学南校区199信箱 合肥工业大学南校区199信箱 合肥工业大学南校区199信箱 合肥工业大学材料科学与工程学院 合肥工业大学材料科学与工程学院
  • 收稿日期:2011-10-19 修回日期:2011-12-20 出版日期:2012-02-20 发布日期:2012-02-20
  • 通讯作者: 郭凌坤

Preparation of Ag@AgCl-TiO2-Flyash Microspheres Composite Photocatalyst and Its Photocatalytic Property under Visible Light

GUO Ling-kun LU Jun ZHOU Song WANG Dong-mei XU Guang-qing ZHENG Zhi-xiang   

  1. School of Materials Sciences and Engineering, Hefei University of Technology School of Materials Sciences and Engineering, Hefei University of Technology School of Materials Sciences and Engineering, Hefei University of Technology School of Materials Sciences and Engineering, Hefei University of Technology School of Materials Science and Engineering, Hefei University of Technology School of Materials Science and Engineering, Hefei University of Technology
  • Received:2011-10-19 Revised:2011-12-20 Online:2012-02-20 Published:2012-02-20
  • Contact: GUO Ling-kun

PDF

被引次数

22

摘要： 采用离子交换法在粉煤灰微珠(FMS)表面沉积Ag@AgCl纳米颗粒，制备Ag@AgCl-FMS复合基底，采用水解-沉淀工艺，以TiCl4为钛源在复合基底表面再包覆纳米TiO2薄膜，经500℃煅烧2 h后得到Ag@AgCl- FMS-TiO2复合光催化剂. 对材料微观形貌、晶体结构、可见光光催化性能进行了表征与测试. 结果表明，复合基底表面包覆的TiO2薄膜均匀完整. 500℃煅烧后的物相为90%锐钛矿型TiO2和10%金红石型TiO2. 复合催化剂料在Ag@AgCl等离子共振效应的作用下，表现出明显的可见光响应，经可见光照射80 min后对甲基橙的降解率达99%，5次重复使用对甲基橙的降解率保持在85%.

关键词: 银, 粉煤灰微珠, 二氧化钛, 光催化, 可见光

Abstract: Ag@AgCl nanoparticles were loaded on the surface of flyash microspheres (FMS) by ion-exchange method to prepare Ag@AgCl-FMS composite support, then nano-TiO2 thin film was coated on it by hydrolysis precipitation with TiCl4 solution as precursor. After annealing at 500℃ for 2 h, the Ag@AgCl-FMS-TiO2 composite photocatalyst was obtained. Its microstructure, crystalline structure and photocatalytic properties under visible light were characterized. The results show that the TiO2 thin film on the substrate is uniform and complete. After calcining at 500℃, the material contains of 90% anatase phase and 10% rutile. The composite modified by Ag@AgCl nanoparticles exhibits high photocatalytic activity under visible light, which is caused by the surface plasmon resonance effect of Ag@AgCl. The degradation rate of methyl orange solution can reach 99% after 80 min irradiation under 250 W metal halide lamp. The photocatalyst also shows great stability. Repeated experiments show that the degradation rate of methyl orange solution can still reach 85% after 5 times of using.

Key words: Ag, flyash microsphere, TiO2, photocatalysis, visible light

中图分类号: