纺织学报 ›› 2021, Vol. 42 ›› Issue (04): 107-113.doi: 10.13475/j.fzxb.20200701307

• 染整与化学品 • 上一篇    下一篇

Ag6Si2O7/TiO2 复合光催化剂的制备及其对亚甲基蓝的降解性能

蒋文雯1,2, 莫慧琳1,2, 樊婷玥1,2, 赵紫瑶1,2, 任煜1,2(), 王春霞1,3, 张伟1,2, 臧传锋1,2   

  1. 1.南通大学 纺织服装学院, 江苏 南通 226019
    2.安全防护用特种纤维复合材料研发国家地方联合工程研究中心, 江苏 南通 226019
    3.盐城工学院 纺织服装学院, 江苏 盐城 224051
  • 收稿日期:2020-07-06 修回日期:2021-01-07 出版日期:2021-04-15 发布日期:2021-04-20
  • 通讯作者: 任煜
  • 作者简介:蒋文雯(1996—),女,硕士。主要研究方向为光催化纤维材料的开发。
  • 基金资助:
    国家自然科学基金项目(51703098);江苏省产学研合作项目(2018204);内蒙古自治区重大科技项目(zdzx2018060);国家级大学生创新创业训练计划项目(201910304058Z)

Preparation of Ag6Si2O7/TiO2 photocatalyst and its photocatalytic degradation of methylene blue

JIANG Wenwen1,2, MO Huilin1,2, FAN Tingyue1,2, ZHAO Ziyao1,2, REN Yu1,2(), WANG Chunxia1,3, ZHANG Wei1,2, ZANG Chuanfeng1,2   

  1. 1. School of Textile and Clothing, Nantong University, Nantong, Jiangsu 226019, China
    2. National & Local Joint Engineering Research Center of Technical Fiber Composites for Safety and Health, Nantong, Jiangsu 226019, China
    3. College of Textiles and Clothing, Yancheng Institute of Technology, Yancheng, Jiangsu 224051, China
  • Received:2020-07-06 Revised:2021-01-07 Online:2021-04-15 Published:2021-04-20
  • Contact: REN Yu

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摘要：

为制备具有稳定性能的可见光催化剂,采用原位沉积法制得Ag6Si2O7/TiO2复合可见光催化剂。对光催化剂的表面形貌、结晶结构、化学元素组成和荧光光谱进行分析。在可见光照射下,以亚甲基蓝为有机污染物模型,探讨了TiO2质量分数对复合光催化剂光催化降解效率的影响。结果表明:Ag6Si2O7/TiO2复合光催化剂中,Ag6Si2O7均匀地包覆在TiO2表面,二者以核壳结构形式紧密结合,且Ag、Si和Ti是以Ag+、Si4+和Ti4+存在;与纯Ag6Si2O7和纯TiO2相比,Ag6Si2O7/TiO2光催化剂具有更高的可见光光催化活性;当TiO2质量分数为20%时,对亚甲基蓝降解效果最佳,在20 min内降解率达到98.6%。这种新型高效复合可见光催化剂可用于处理印染废水,具有广阔的应用前景。

关键词: TiO2, 光催化剂, 染料降解, 亚甲基蓝, 印染废水处理

Abstract:

In order to prepare visible light catalyst with stable performance, a novel highly efficient Ag6Si2O7/TiO2 photocatalyst was prepared by an in-situ deposition method.The surface morphology, crystalline structure, chemical elemental composition and fluorescence spectrum of the photocatalyst were analyzed. The photocatalytic activity of the composite catalyst with different concentration of TiO2 were tested by degrading methylene blue (MB) under simulated visible light at room temperature. The results show that Ag6Si2O7 are coated on TiO2 uniformly, Ag6Si2O7 and TiO2 are tightly bonded in the form of core-shell structure, and Ag+, Si4+and Ti4+ exist in composite catalyst. The results of photocatalytic degradation of MB show that the Ag6Si2O7/TiO2 photocatalyst exhibits higher photocatalytic activity under visible light than Ag6Si2O7 and TiO2 used separately. When the mass fraction of TiO2 is 20%, the photocatalyst possesses the highest photocatalytic activity. The degradation efficiency for MB is up to 98.6% after irradiating in simulated solar for 20 min. The novel high-efficiency Ag6Si2O7/TiO2 photocatalyst has a broad application prospect in treatment of printing and dyeing wastewater.

Key words: TiO2, photocatalyst, dye degradation, methylene blue, printing and dyeing wastewater treatment

中图分类号: 

  • O643.36

图1

Ag6Si2O7/TiO2的制备过程"

图2

光催化剂的扫描电镜照片"

图3

光催化剂的X射线衍射图"

图4

Ag6Si2O7/TiO2的XPS图谱"

图5

光催化剂的红外光谱图"

图6

光催化剂的荧光发射光谱图"

图7

模拟可见光下不同光催化剂降解亚甲基蓝的降解曲线"

表1

不同捕获剂下Ag6Si2O7/TiO2 对亚甲基蓝的降解效率"

捕获剂 空白样 EDTA-2Na IPA BQ
降解率/% 98.6 36.8 91.6 76.3

图8

Ag6Si2O7/TiO2复合光催化剂光催化机制"

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