• 关键词：TiO₂单晶  SiO₂纳米颗粒  吸附  降解速率  盐酸四环素

• 基金项目：国家水体污染控制与治理科技重大专项（No.2017ZX07202001-004，2017ZX07202001-005）；中央高校基本科研业务费专项资金（No.JUSRP51512）

• 王艳红
• 江南大学环境与土木工程学院, 无锡 214122

• 吕金泽
• 1. 江南大学环境与土木工程学院, 无锡 214122;2. 江苏省厌氧生物技术重点实验室, 无锡 214122

• 李通
• 江南大学环境与土木工程学院, 无锡 214122

• 彭禹锦
• 江南大学环境与土木工程学院, 无锡 214122

• 刘飞杨
• 江南大学环境与土木工程学院, 无锡 214122

• 李激
• 1. 江南大学环境与土木工程学院, 无锡 214122;2. 江苏省厌氧生物技术重点实验室, 无锡 214122

• 摘要：吸附性能和光生载流子的分离效率是决定光催化降解抗生素的主要因素.为提高介孔TiO₂单晶（MSCs）的吸附性能和光生载流子的分离效率，在MSCs内部构建SiO₂纳米颗粒吸附结构.同时，利用表面光电压谱、氮气等温吸附-脱附、X射线衍射等研究其结构特性.最后，以盐酸四环素为抗生素代表，通过控制SiO₂纳米颗粒比表面积，考察SiO₂对复合材料吸附及光催化性能的影响.结果表明，SiO₂纳米颗粒与TiO₂单晶复合显著提高了材料的吸附性能，表面保护蚀刻进一步提升了材料的比表面积.实验条件下，高比表面积SiO₂-TiO₂单晶复合材料（KSiO₂@TiO₂）对盐酸四环素的平衡吸附量、降解效率、降解速率常数和矿化率分别达到了0.96 mg·g^-1、90.2%、0.0079 min^-1、54.4%，分别是MSCs的4.4、1.5、2.6和3.1倍.副产物分析表明，SiO₂复合介孔单晶材料更易将盐酸四环素降解为小分子物质.

• Abstract：Adsorption capacity and charge separation efficiency are the main factors that determine the photocatalytic degradation efficiency of antibiotics. In order to improve the adsorption ability and photoactivity of mesoporous TiO₂ single crystals (MSCs), SiO₂ nanoparticles was induced into TiO₂ single crystal. The structural characteristics of the prepared materials were studied by surface photovoltage, nitrogen isothermal adsorption-desorption, and X-ray diffraction. The tetracycline hydrochloride was taken as the representative of antibiotics to investigate the photocatalytic activity of the prepared samples. The results showed that the combination of SiO₂ nanoparticles and TiO₂ single crystal significantly improved the adsorption amount of tetracycline hydrochloride and the charge separation efficiency of the composited MSCs. Under the experimental conditions, the equilibrium adsorption amount, degradation efficiency, degradation rate constant and mineralization rate of tetracycline hydrochloride for high surface area SiO₂-TiO₂ single crystal composites (KSiO₂@TiO₂) reached 0.96 mg·g^-1, 90.2%, 0.0079 min^-1, 54.4%, that were 4.4 times, 1.5 times, 2.6 times and 3.1 times of MSCs, respectively. Moreover, by-product analysis showed that KSiO₂@TiO₂ was more likely to degrade tetracycline hydrochloride into small molecules.

• Key words：TiO₂ single crystal  SiO₂ nanoparticles  adsorption  degradation rate  tetracycline hydrochloride

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