纳米纤维素制备碳掺杂ZnO及其对四环素的光催化降解性能

Preparation of Carbon-doped Zinc Oxide Induced by Nanocellulose and Its Photocatalytic Degradation Properties of Tetracycline

以纳米纤维素(CNF)为生物质诱导剂,通过水热合成法制备了碳掺杂氧化锌(C-ZnO),通过XRD、FT-IR、SEM和DRS对C-ZnO进行了表征,并测试了C-ZnO对四环素的光催化降解性能。研究结果表明:纳米纤维素诱导制备C-ZnO时,分散性较好,晶粒尺寸减小,并实现了碳掺杂,能带宽度有所减小。与普通氧化锌相比,C-ZnO对四环素的物理吸附没有影响,但是光催化降解四环素时,降解去除速率较快。当水热温度为200℃、n(Zn^2+)∶n(OH-)为1∶4、硝酸锌与纳米纤维素质量比为100∶1时,制得的C-ZnO光照120min,四环素的去除率高达96.1%。

Carbon-doped zinc oxide (C-ZnO) was prepared by hydrothermal synthesis using nanocellulose (CNF) as an inducing agent. C-ZnO was characterized by XRD, FT-IR, SEM and DRS. The photocatalytic degradation of tetracycline by C-ZnO was investigated. It was found that nanocellulose-induced ZnO had good dispersibility, reduced grain size and carbon doping with narrow band gap. Compared with ordinary zinc oxide, C-ZnO didn′t affect the physical adsorption of tetracycline. But it had faster degradation rate of tetracycline in the photocatalytic process. When the hydrothermal temperature of C-ZnO was 200 ℃, n(Zn^2 +)∶ n(OH -) was 1∶ 4 and the mass ratio of zinc nitrate to nanocellulose was 100∶ 1, the removal of tetracycline was up to 96. 1% with 120 min light irradiation.