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.

中文翻译：

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碳酸盐自由基在基于太阳光驱动的 TiO2-贝壳复合材料降解四环素盐酸盐中的重要作用：去除和转化途径

摘要 采用溶胶-凝胶法制备的TiO2-贝壳复合材料在太阳光照射下产生碳酸盐自由基(•CO3-)。•CO3−，一种选择性自由基，用于降解目标四环素盐酸盐污染物。进行了一系列表征以研究合成的 TiO2-贝壳复合材料的结构和组成。该材料在四环素盐酸盐的分解中表现出优异的太阳光驱动光化学活性。在高分辨率电喷雾电离飞行时间质谱实验的基础上，提出了光降解过程的可能途径和机制。最后，我们研究了 TiO2-贝壳复合材料的可重复使用性。