Wang Xiaoyu, Feng Mengchao, Cao Rui, Wang Yuchang, Ma Kai, Zhang Jianbin
Hebei Provincial Key Lab of Green Chemical Technology and High Efficient Energy Saving, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China.
Hebei Provincial Key Lab of Green Chemical Technology and High Efficient Energy Saving, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China.
J Colloid Interface Sci. 2025 Jan;677(Pt B):780-794. doi: 10.1016/j.jcis.2024.08.127. Epub 2024 Aug 18.
A new CeCOOH@(hexagonal/cubic phases-CdS) (CeCOOH@(H/C-CdS)) composite catalyst was facilely synthesized by a simple microinjection titration-stirring method, in which CdS nanoparticles were dispersed on the surface of CeCOOH nanolines. The optimal conditions for the preparation of composite catalysts with high photocatalytic performance were determined by single-factor experiments and response surface experiments. Under these conditions, the degradation rate of 30 mL 2.000 g/L rhodamine B (Rh B) by CeCOOH@(H/C-CdS) in a photocatalytic reaction for 1 h at 25 °C was up to 86.81 % and its degradation rate in a photocatalytic reaction for 150 min was up to 99.62 %. The degradation rate could be maintained above 80 % even after six times recycling. Especially, the photocatalytic degradation efficiency of 2.000 g/L Rh B on the composite catalyst under sunlight and at room temperature for 30 min reached 97.66 %. Meanwhile, the large size of CeCOOH considerably alleviated the agglomeration of CdS, providing more adsorption and active sites for visible light-mediated degradation of Rh B. Importantly, the Z-scheme charge transfer realized by CdS and CeCOOH enhanced the efficient separation of photogenerated electrons and holes, and successfully inhibited the recombination of photogenerated electrons with holes. At the same time, owing to the low energy band difference between the two phases of CdS, charge was transferred between the hexagonal and cubic phases, leaving more effective photogenerated charge to participate in the degradation of Rh B. The synergism of the heterophase junction and heterojunction and the presence of oxygen and sulfur vacancies considerably enhanced the degradation performance of the catalyst. Thus, this study provides a new strategy for the modification and enhanced visible-light catalysis performance of CdS-based catalysts.
通过简单的微注射滴定-搅拌法轻松合成了一种新型CeCOOH@(六方/立方相-CdS)(CeCOOH@(H/C-CdS))复合催化剂，其中CdS纳米颗粒分散在CeCOOH纳米线的表面。通过单因素实验和响应面实验确定了制备具有高光催化性能的复合催化剂的最佳条件。在这些条件下，CeCOOH@(H/C-CdS)在25℃下对30 mL 2.000 g/L罗丹明B(Rh B)进行1 h光催化反应的降解率高达86.81%，在150 min光催化反应中的降解率高达99.62%。即使经过六次循环，降解率仍可保持在80%以上。特别是，复合催化剂在太阳光下室温下对2.000 g/L Rh B进行30 min的光催化降解效率达到97.66%。同时，CeCOOH的大尺寸显著减轻了CdS的团聚，为可见光介导的Rh B降解提供了更多的吸附和活性位点。重要的是，CdS和CeCOOH实现的Z型电荷转移增强了光生电子和空穴的有效分离，并成功抑制了光生电子与空穴的复合。同时，由于CdS两相之间的低能带差，电荷在六方相和立方相之间转移，留下更多有效的光生电荷参与Rh B的降解。异相结和异质结的协同作用以及氧和硫空位的存在显著提高了催化剂的降解性能。因此，本研究为CdS基催化剂的改性和增强可见光催化性能提供了一种新策略。
