State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
J Hazard Mater. 2021 Apr 15;408:124432. doi: 10.1016/j.jhazmat.2020.124432. Epub 2020 Oct 31.
A surface defect sandwich-structural TiO/ultrathin g-CN/TiO direct Z-scheme heterojunction photocatalyst is successfully constructed. The results manifest the existence of oxygen vacancies, sandwich structure and direct Z-scheme heterojunction. Noticeably, TiO/ultrathin g-CN/TiO efficiently eliminates high toxic tetracycline hydrochloride by means of·O, h and·OH, whose removal rate is 87.7% during 90 min and the pseudo-first-order rate constant reaches up to 31.7 min × 10. The extraordinary performance can be attributed to the special 3D structure, Z-scheme heterojunction expediting charge transfer and promoting the generation of active species, meanwhile the oxygen vacancies enhancing the spatial separation of photo-induced carriers. Moreover, various environmental factors are systematically explored by statistics. SO, NH-N and pH exhibit an obvious impact on removal rate. Meanwhile, TiO/ultrathin g-CN/TiO could also effectually remove tetracycline hydrochloride from complex actual-wastewater and exhibit high stability. Besides, the photocatalytic mechanism and degradation path of tetracycline hydrochloride are also elucidated.
一种表面缺陷夹层结构 TiO/超薄 g-CN/TiO 直接 Z 型异质结光催化剂被成功构建。结果表明存在氧空位、夹层结构和直接 Z 型异质结。值得注意的是，TiO/超薄 g-CN/TiO 通过·O、h 和·OH 有效地去除高毒性盐酸四环素，在 90 分钟内去除率达到 87.7%，假一级速率常数高达 31.7 min×10。卓越的性能归因于特殊的 3D 结构、Z 型异质结加速电荷转移和促进活性物种的生成，同时氧空位增强光致载流子的空间分离。此外，通过统计系统地探索了各种环境因素。因此，SO、NH-N 和 pH 对去除率有明显影响。同时，TiO/超薄 g-CN/TiO 还可以有效地从复杂实际废水中去除盐酸四环素，并表现出高稳定性。此外，还阐明了盐酸四环素的光催化机制和降解途径。
