Zhu Yujie, Wang Ling, Xu Wentao, Xu Zehai, Yuan Junsheng, Zhang Guoliang
Center for Membrane and Water Science &Technology, Institute of Oceanic and Environmental Chemical Engineering, State Key Lab Breeding Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou, 310014, PR China.
Hangzhou Special Equipments Inspection and Research Institute, Hangzhou, China.
Heliyon. 2022 Dec 23;8(12):e12644. doi: 10.1016/j.heliyon.2022.e12644. eCollection 2022 Dec.
In view of the environmental pollution caused by antibiotics, the creation of an efficient photocatalytic material is an effectual way to carry out water remediation. Herein, we developed a smart strategy to synthesize ZnO/CuO/g-CN heterojunction photocatalysts for the photodegradation of hazardous antibiotics by one-pot synthesis method. In this system, the CuO nanoparticles with electrons reducing capacity were coupled with g-CN composites. The photocarriers were generated from the electric field of type Ⅰ heterojunction between ZnO and g-CN and type Ⅱ heterojunction between CuO and g-CN. ZnO as a co-catalyst was doped to CuO/g-CN catalyst system for removal of broad-spectrum antibiotics with the condition of visible light to protect CuO from photocorrosion, which thereby accelerated photocatalytic reactivity. Benefiting by new p-n-n heterojunction, the resulting ZnO/CuO/g-CN composites had an excellent degradation performance of broad-spectrum antibiotics such as tetracycline (TC), chlortetracycline (CTC), oxytetracycline (OTC) and ciprofloxacin (CIP), the degradation of which were 98.79%, 99.5%, 95.35% and 73.53%. In particular, ZnO/CuO/g-CN photocatalysts showed a very high degradation rate of 98.79% for TC in first 30 min under visible light, which was 1.35 and 10.62 times higher than that of CuO/g-CN and g-CN, respectively. This work gives a fresh visual aspect for simultaneously solving the instability deficiencies of traditional photocatalysts and improving photocatalytic performance.
鉴于抗生素造成的环境污染，制备高效的光催化材料是实现水体修复的有效途径。在此，我们开发了一种智能策略，通过一锅合成法制备ZnO/CuO/g-CN异质结光催化剂，用于光降解有害抗生素。在该体系中，具有电子还原能力的CuO纳米颗粒与g-CN复合材料耦合。光生载流子由ZnO与g-CN之间的Ⅰ型异质结和CuO与g-CN之间的Ⅱ型异质结的电场产生。将ZnO作为助催化剂掺杂到CuO/g-CN催化剂体系中，在可见光条件下去除广谱抗生素，以保护CuO免受光腐蚀，从而加速光催化反应活性。得益于新型p-n-n异质结，所得的ZnO/CuO/g-CN复合材料对四环素（TC）、金霉素（CTC）、土霉素（OTC）和环丙沙星（CIP）等广谱抗生素具有优异的降解性能，其降解率分别为98.79%、99.5%、95.35%和73.53%。特别是，ZnO/CuO/g-CN光催化剂在可见光下前30分钟对TC的降解率高达98.79%，分别比CuO/g-CN和g-CN高1.35倍和10.62倍。这项工作为同时解决传统光催化剂的不稳定性缺陷和提高光催化性能提供了新的视角。
