基于Si掺杂增强光吸收提升Li2SnO3 光催化降解四环素的研究

doi:10.11901/1005.3093.2021.265

材料研究学报

2022, Vol. 36

Issue (3): 206-212 DOI: 10.11901/1005.3093.2021.265

研究论文

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基于Si掺杂增强光吸收提升Li₂SnO₃ 光催化降解四环素的研究

李园园¹(

), 曾寒露¹, 蒲红争¹, 蒋明珠¹, 王仲明¹, 杨怡萌¹, 公祥南²

^1.重庆第二师范学院生物与化学工程学院重庆 400067
^2.重庆大学分析测试中心重庆 401331

Photocatalytic Degradation of Tetracycline by Si Doped Li₂SnO₃

LI Yuanyuan¹(

), ZENG Hanlu¹, PU Hongzheng¹, JIANG Mingzhu¹, WANG Zhongming¹, YANG Yimeng¹, GONG Xiangnan²

^1.College of Biological and Chemical Engineering, Chongqing University of Education, Chongqing 400067, China
^2.Analytical and Testing Center of Chongqing University, Chongqing 401331, China

引用本文:

李园园, 曾寒露, 蒲红争, 蒋明珠, 王仲明, 杨怡萌, 公祥南. 基于Si掺杂增强光吸收提升Li₂SnO₃ 光催化降解四环素的研究[J]. 材料研究学报, 2022, 36(3): 206-212.
Yuanyuan LI, Hanlu ZENG, Hongzheng PU, Mingzhu JIANG, Zhongming WANG, Yimeng YANG, Xiangnan GONG. Photocatalytic Degradation of Tetracycline by Si Doped Li₂SnO₃[J]. Chinese Journal of Materials Research, 2022, 36(3): 206-212.

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摘要:

在Li₂SnO₃中掺杂Si，研究了Si掺杂Li₂SnO₃对四环素的光催化降解性能。结果表明，对Li₂SnO₃进行等电子Si掺杂使其光学吸收带隙减小和光吸收系数增大，提高了对四环素的光催化降解效率。等电子Si掺杂Li₂SnO₃为纯相不规则块状固体，随着Si掺杂量的增加其晶格参数呈减小的趋势。Si掺杂使样品的光催化性能显著提高。Si掺杂量为10%的样品，在紫外光照射25 min后光催化降解效率为75.8%，约为母体的2倍。Si掺杂Li₂SnO₃的光催化降解行为满足赝一级动力学模型，拟合速率常数为0.02464 min^-1。在Si掺杂Li₂SnO₃的价带顶形成的Si-O键减少了光学吸收带隙，使其光吸收能力增强。Si掺杂Li₂SnO₃的光催化降解机制，属于空穴主导型。

关键词 ：无机非金属材料, Si掺杂, 光催化, 能带计算, 四环素

Abstract：

The photocatalytic degradation of tetracycline by Si-doped Li₂SnO₃ was investigated. The results show that, through iso-electron Si doping the optical absorption band gap of Li₂SnO₃may be reduced, while its optical absorption coefficient is increased, in consequence, the photocatalytic degradation efficiency of the Si-doped Li₂SnO₃for_{tetracycline is enhanced. The isoelectronicaly Si-doped Li₂SnO₃ is a pure and irregular mass solid, and its lattice parameters tend to decrease with the increase of Si doping amount. The photocatalytic performance of the Si-doped Li₂SnO₃ was significantly improved by Si doping. Under UV irradiation for 25 min, the photocatalytic degradation efficiency of tetracycline by the Si 10%-doped Li₂SnO₃ is 75.8%, which is about twice as that by the simple Li₂SnO₃. The photocatalytic degradation behavior of Si-doped Li₂SnO₃ conforms to the pseudo-first-order kinetic model, and the fitting rate constant is 0.02464 min^-1. The Si-O bond formed on the top of the valence band of Si-doped Li₂SnO₃ reduces the optical absorption band gap and enhances its optical absorption capacity. The photocatalytic degradation mechanism of Si-doped Li₂SnO₃ is cave-dominated.}

Key words： inorganic non-metallic materials Si doping photocatalysis band gap calculation tetracycline

收稿日期: 2021-04-25

ZTFLH:

O643

基金资助:重庆英才创新创业示范团队(CQYC201903178);重庆市重庆市教育委员会科学技术研究项目(KJQN202001613);教育部学校规划建设发展中心重庆第二师范学院儿童研究院课题(CSDP19FS01204);重庆第二师范学院国家自科基金校级培育项目(18GZKP01);重庆第二师范学院大学生科研项目(KY20200138)

作者简介: 李园园，女，1985年生，副教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.265 或 https://www.cjmr.org/CN/Y2022/V36/I3/206

图1 Li2Sn1-x Si x O3(x=0，0.05，0.1)的XRD谱(a)和LSO的SEM照片(b)

表1 Li2Sn1-x Si x O3(x=0，0.05，0.1)的晶格参数

图2 LSO和LSSO-10的UV-vis漫反射谱(a)以及LSO和LSSO-10的(αhv)2与hv的关系(b)

图3 Li2Sn1-x Si x O3(x=0，0.05，0.1)的光催化降解TC图(a)、Li2Sn0.90Si0.10O3 UV下光催化降解TC的紫外吸收光谱(b)、光催化降解TC的一阶动力学线性拟合(c)以及TC光降解拟合的动力学常数(d)

图4 LSSO-10降解TC溶液活性自由基捕获实验

图5 Li2SnO3 (a)和Li2Sn0.9375Si0.0625O3 (b)的能带结构

图6 Li2Sn0.9375Si0.0625O3的轨道能级投影图

图7 Li2SnO3(a)和Li2Sn0.9375Si0.0625O3(b)的电子态密度

图8 Li2Sn0.90Si0.10O3光催化剂在紫外光照射下光催化降解TC的机理

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