·CO3-在基于太阳光驱动的TiO2-贝壳粉降解盐酸四环素中的作用:降解机理和转化路径

引用本文: 王佳琦, 钱庆荣, 陈庆华, 刘欣萍, 罗永晋, 薛珲, 李朝晖. ·CO₃^-在基于太阳光驱动的TiO₂-贝壳粉降解盐酸四环素中的作用:降解机理和转化路径[J]. 催化学报, 2020, 41(10): 1511-1521. doi: S1872-2067(19)63525-4 shu

Citation: Jiaqi Wang, Qingrong Qian, Qinghua Chen, Xin-Ping Liu, Yongjin Luo, Hun Xue, Zhaohui Li. Significant role of carbonate radicals in tetracycline hydrochloride degradation based on solar light-driven TiO₂-seashell composites: Removal and transformation pathways[J]. Chinese Journal of Catalysis, 2020, 41(10): 1511-1521. doi: S1872-2067(19)63525-4 shu

·CO₃^-在基于太阳光驱动的TiO₂-贝壳粉降解盐酸四环素中的作用:降解机理和转化路径

a 福建师范大学环境科学与工程学院, 福建省污染控制与资源循环利用重点实验室, 福建福州 350007;
b 福建师范大学福清分校, 福建福清 350007;
c 福州大学化学学院, 能源与环境光催化国家重点实验室, 福建福州 350116
基金项目:
国家自然科学基金（21875037，51502036）；国家重点研发计划（2016YFB0302303）.

摘要: 抗生素的滥用和不当排放对水陆生生态系统造成了严重威胁，在世界各地水环境污染物调研中普遍检测到盐酸四环素的存在.如何解决水体中高稳定、难降解的盐酸四环素污染问题是当前环境领域重点研究的课题之一.在各种去除方法中，利用光化学反应生成活性氧物种如·CO₃^-，·OH，·O₂^-，·SO₄^-和¹O₂等实现对有机污染物的降解在众多研究方法中脱颖而出.·CO₃^-在水体中具有较高的稳态浓度且其对有机物降解具有高选择性.CO₃^2-或HCO₃^-与活性物种如·OH，h⁺，·O₂^-，·SO₄^-等反应可以生成·CO₃^-.传统的半导体光催化剂TiO₂在光照下会产生·OH，·O₂^-及h⁺等活性物种，能有效地降解有机污染物，已有研究发现添加CO₃^2-/HCO₃^-有利于提高UV/TiO₂体系降解有机物的反应速率.
贝壳中含有95%以上的碳酸钙，由于其具有低成本、生态友好、无毒性等特点而越来越受到人们的关注.贝壳与TiO₂复合，利用贝壳在水相中提供的CO₃^2-/HCO₃^-与TiO₂在光照下产生的·OH，·O₂^-及h⁺等活性物种反应生成·CO₃^-促进光催化反应速率的提高，对盐酸四环素的有效去除具有显著意义.
本文通过溶胶-凝胶法合成TiO₂-贝壳粉，采用X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱、红外光谱和氮气吸附-脱附测试等技术对所得样品进行了表征.考察了TiO₂-贝壳粉在模拟太阳光下对盐酸四环素的降解性能.结果表明，在模拟太阳光的作用下，40% TS-300在30min内能降解94.0%的盐酸四环素，优于纯TiO₂的降解效率（88.6%）.通过自由基捕获实验比较了TiO₂和TiO₂-贝壳粉体系降解盐酸四环素机理的差异，在TiO₂光催化降解盐酸四环素体系中，·O₂^-和h⁺是主要活性物种.而在TiO₂-贝壳粉体系中，TiO₂在光照条件下产生的·OH，·O₂^-及h⁺通过与贝壳粉在水相中提供的CO₃^2-/HCO₃^-进一步产生·CO₃^-，·CO₃^-、·O₂^-和h⁺协同作用实现盐酸四环素的有效降解.采用HRESI-TOF-MS研究了40% TS-300光降解盐酸四环素的中间转化产物，提出TiO₂-贝壳粉光降解盐酸四环素可能的降解路径.对40% TS-300样品进行了光降解盐酸四环素长效循环测试，结果表明该样品能够保持稳定有效的降解盐酸四环素性能，此为该材料今后的潜在应用奠定了可靠基础.

关键词:

English

Significant role of carbonate radicals in tetracycline hydrochloride degradation based on solar light-driven TiO₂-seashell composites: Removal and transformation pathways

a College of Environmental Science and Engineering, Fujian Key Laboratory of Pollution Control&Resource Reuse, Fujian Normal University, Fuzhou 350007, Fujian, China;
b Fuqing Branch of Fujian Normal University, Fuqing 350300, Fujian, China;
c State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, Fujian, China
Received Date: 26 January 2020
Revised Date: 03 March 2020
Fund Project:
This work was supported by the National Natural Science Foundation of China (21875037, 51502036), and the National Key R&D Program of China (2016YFB0302303).

Abstract: TiO₂-seashell composites prepared via a sol-gel method were used to generate carbonate radicals (·CO₃^-) under solar light irradiation.·CO₃^-, a selective radical, was employed to degrade the target tetracycline hydrochloride contaminant. A series of characterizations was carried out to study the structure and composition of the synthesized TiO₂-seashell composite. This material exhibits excellent solar light-driven photochemical activity in the decomposition of tetracycline hydrochloride. The possible pathway and mechanism for the photodegradation process were proposed on the basis of high-resolution electrospray ionization time-of-flight mass spectrometry experiments. Finally, we investigated the reusability of the TiO₂-seashell composite. This study is expected to provide a new facile pathway for the application of·CO₃^- radicals to degrade special organic pollutants in water.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

·CO₃^-在基于太阳光驱动的TiO₂-贝壳粉降解盐酸四环素中的作用:降解机理和转化路径

English

Significant role of carbonate radicals in tetracycline hydrochloride degradation based on solar light-driven TiO₂-seashell composites: Removal and transformation pathways

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