Ce-La-Ag共掺杂TiO<sub>2</sub>/玄武岩纤维复合光催化剂的制备和性能

doi:10.11901/1005.3093.2018.588

材料研究学报

2019, Vol. 33

Issue (7): 515-522 DOI: 10.11901/1005.3093.2018.588

研究论文

本期目录 | 过刊浏览

Ce-La-Ag共掺杂TiO₂/玄武岩纤维复合光催化剂的制备和性能

陈子尚¹,梁小平¹(

),樊小伟¹,王军¹,黄安定¹,刘志锋²(

)

1. 分离膜与膜过程国家重点实验室天津工业大学材料科学与工程学院天津 300387
2. 天津城建大学材料科学与工程学院天津 300384

Fabrication and Photocatalytic Properties of Ce-La-Ag Co-doped TiO₂/Basalt Fiber Composite Photocatalyst

Zishang CHEN¹,Xiaoping LIANG¹(

),Xiaowei FAN¹,Jun WANG¹,Anding HUANG¹,Zhifeng LIU²(

)

1. State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China
2. School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin 300384, China

引用本文:

陈子尚,梁小平,樊小伟,王军,黄安定,刘志锋. Ce-La-Ag共掺杂TiO₂/玄武岩纤维复合光催化剂的制备和性能[J]. 材料研究学报, 2019, 33(7): 515-522.
Zishang CHEN, Xiaoping LIANG, Xiaowei FAN, Jun WANG, Anding HUANG, Zhifeng LIU. Fabrication and Photocatalytic Properties of Ce-La-Ag Co-doped TiO₂/Basalt Fiber Composite Photocatalyst[J]. Chinese Journal of Materials Research, 2019, 33(7): 515-522.

全文: PDF(8766 KB) HTML

摘要:

以玄武岩纤维(BF)为载体,用溶胶凝胶法将Ce-La-Ag共掺TiO₂负载于BF上制备出Ce-La-Ag共掺杂TiO₂/玄武岩纤维复合光催化剂。用光催化降解氨氮废水,研究了烧结温度和废水的pH值对Ce-La-Ag-TiO₂/BF光催化活性的影响。结果表明：Ce-La离子与纳米Ag颗粒的协同作用使TiO₂的禁带宽度由3.2 eV降至2.15 eV。Ce-La-Ag-TiO₂的光催化活性优于纯TiO₂、Ag-TiO₂和Ce-La-TiO₂,负载到BF使其光催化活性进一步提高。当复合光催化剂的烧结温度为600 ℃、氨氮废水的pH值为10.5、模拟可见光的照射时间为360 min时,Ce-La-Ag-TiO₂/BF对氨氮废水重复降解5次的降解率仍高于88.2%。

关键词 ：无机非金属材料, TiO₂复合光催化剂, 稀土-贵金属共掺, 玄武岩纤维, 氨氮废水降解

Abstract：

The composite photocatalyst of Ce-La-Ag-TiO₂/BF (basalt fiber) was prepared by coating the Ce-La-Ag co-doped TiO₂ onto BF via sol-gel method. The effect of the calcination temperature of the composite photocatalyst and the pH value of wastewater on the photocatalytic activity of these photocatalysts was evaluated by examining the degradation rate of ammonia-nitrogen wastewater. The results show that the coupling effect of Ce-La ion and Ag nanoparticles results in the decreases of the band gap of TiO₂ from 3.2 eV to 2.15 eV, with a photocatalytic activity obviously higher than those of the pure TiO₂, Ce-La-TiO₂ and Ag-TiO₂. Moreover, the catalytic activity of Ce-La-Ag-TiO₂ is further improved after being deposited onto BF. When the calcination temperature for the Ce-La-Ag-TiO₂, pH of wastewater and irradiating time of simulate visible light are 600^oC, 10.5 and 360 min, respectively, the resulted degradation rate of ammonia nitrogen wastewater can still reach above 88.2% after repeated use of the composite photocatalyst for five times.

Key words： Inorganic non-metallic materials TiO₂ composite photocatalyst rare earth and noble metal co-doped basalt fiber ammonia nitrogen wastewater degradation

收稿日期: 2018-09-27

ZTFLH:

O643.36

基金资助:国家教育部“创新团队发展计划”(IRT-17R80);天津市杰出青年基金(17JCJQJC44800)

作者简介: 陈子尚,男,1993年生,硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.588 或 https://www.cjmr.org/CN/Y2019/V33/I7/515

图1 光催化剂的XRD谱图

图2 Ce-La-Ag-TiO2的X射线电子能谱图

图3 光催化剂的紫外可见吸收光谱和禁带宽度

图4 光催化剂的氨氮降解效果

图5 基体和光催化剂的SEM和TEM照片

图6 不同烧结温度和不同废水pH值时Ce-La-Ag-TiO2/BF的氨氮降解浓度曲线

图7 Ce-La-Ag-TiO2/BF重复使用次数对光催化降解氨氮效果的影响

图8 催化剂的瞬时光电流响应效果

图9 催化剂的交流阻抗图谱

图10 Ce-La-Ag-TiO2/BF光催化降解氨氮的反应机理

图11 在光催化反应过程中含氮物的浓度曲线

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