Br-N共掺杂TiO<sub>2</sub>/磁性炭复合材料的制备及其可见光催化性能

王佳忆; 王学江; 黄嘉瑜; 王鑫; 宋靖珂; 赵建夫

doi:10.13801/j.cnki.fhclxb.20161205.002

Br-N共掺杂TiO₂/磁性炭复合材料的制备及其可见光催化性能

同济大学环境科学与工程学院, 污染控制与资源化研究国家重点实验室, 上海 200092

基金项目: 国家自然科学基金（21277097；21377095）

详细信息

通讯作者:
王学江,博士,教授,研究方向为水污染控制及其资源利用化,E-mail:wangxj@tongji.edu.cn

中图分类号: TB333
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出版历程
- 收稿日期: 2016-05-05
- 修回日期: 2016-06-17
- 刊出日期: 2017-04-14

Preparation and photocatalytic performance of Br-N codoped TiO₂/magnetic carbon composites

State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 以活性炭（AC）为原材料，采用铁盐化学沉淀法耦合壳聚糖-戊二醛交联改性技术制备磁性活性炭（MAC）。以MAC为载体，采用溶胶-凝胶法制备不同Br/Ti掺杂比的Br-N共掺杂TiO₂/MAC可见光催化复合材料（Br_x-N-TiO₂/MAC）。通过XRD、UV-Vis漫反射、BET吸附实验、SEM、XPS表征其结构和化学特征。以水杨酸为模型分子进行光催化降解，评价不同Br_x-N-TiO₂/MAC材料的可见光催化活性。实验结果表明，相较于N-TiO₂/MAC可见光催化剂，Br-N共掺杂更能促进催化剂对可见光的吸收。Br_0.35-N-TiO₂/MAC对水杨酸的降解效果最好，暗吸附1 h、光催化3 h后，Br_0.35-N-TiO₂/MAC对水杨酸的降解率达到83%，高浓度水杨酸会对光催化反应产生一定的抑制作用，该催化材料重复利用三次后仍有78%的去除率，显示了较好的稳定性。
- 磁性活性炭 /
- Br-N共掺杂 /
- 可见光催化 /
- 复合材料 /
- 水杨酸
Abstract: Magnetic activate carbon (MAC) coupled by chitosan-glutaraldehyde crosslinking technique was synthesized by ferric salts chemical precipitation method using activate carbon as raw meterial. Based on MAC, Br-N codoped TiO₂/magnetic carbon composites (Br_x-N-TiO₂/MAC) were prepared by a facile sol-gel method.The synthesized composites were characterized by XRD, UV-Vis diffuse reflectance spectroscopy (DRS), N₂ adsorption-desorption test (BET), SEM and XPS. The photocatalytic activity of the composites was evaluated by photocatalytic degradation of salicylic acid under visible light irradiation. Compared with N-TiO₂/MAC, Br_x-N-TiO₂/MAC has a better photocatalytic performance. The degradation effect of Br_0.35-N-TiO₂/MAC to salicylic acid is the best, and the photocatalytic degradation rate of Br_0.35-N-TiO₂/MAC for 3 h can reach up to 83% after 1 h dark absorption. High concentration of salicylic acid can inhibit the photocatalytic reaction rate of Br_x-N-TiO₂/MAC. After reused for three times, the removal rate of Br_0.35-N-TiO₂/MAC to salicylic acid can still reach 78%, which proves the composites have a good chemical stability.
- magnetic activated carbon /
- Br-N codoped /
- visible light photocatalysis /
- composites /
- salicylic acid

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