Xia Guangda, Xiao Sichen, Su Junjie, Zhou Hui, Liu Yu, Zhu Xiaodong
College of Material Science and Engineering, Northeast Forestry University Harbin 150040 China
Key Laboratory of Bio-based Material Science and Technology (Northeast Forestry University), Ministry of Education Harbin 150040 China.
RSC Adv. 2023 Jan 11;13(3):1823-1833. doi: 10.1039/d2ra06735h. eCollection 2023 Jan 6.
A large quantity of wastewater is released from wood processing, posing a serious pollution problem to the natural environment. Photocatalysis has become a reliable method for effluent purification. In this paper, balsa-templated BiVO-CdS (BBC) was synthesized by impregnation calcination and chemical deposition using wood residue as a template. Rhodamine B (RhB) is used as a wood colorant and is present in wood processing wastewater. The performance of BBC in photocatalytic degradation with simultaneous hydrogen production was identified using RhB as simulated wood dye wastewater and a sacrificial electron donor. Compared to the BiVO-CdS without a template, the BBC exhibited higher photocatalytic degradation performance (98.32%), which was attributed to the laminar porous structure of the wood being replicated. Because of the existence of a porous structure, BBC has better adsorption properties, which accelerated photodegradation and the production process of H. Furthermore, surface modification with CdS nanoparticles formed Z-scheme heterojunctions, which greatly inhibited the photogenerated electron-hole compounds. When RhB provided electrons to BiVO and CdS, it was also removed by the oxidation of h and ·OH, which were simultaneously generated by balsa-templated BiVO-CdS. BBC produced hydrogen at a higher rate (61.2 μmol g h), realizing dual-functional photocatalysis. Therefore, the results support further development of dual-functional catalysts by the use of wood residues.
木材加工过程中会排放大量废水，对自然环境造成严重污染问题。光催化已成为一种可靠的废水净化方法。本文以木材残渣为模板，通过浸渍煅烧和化学沉积法合成了轻木模板化的BiVO-CdS（BBC）。罗丹明B（RhB）用作木材着色剂，存在于木材加工废水中。以RhB作为模拟木材染料废水和牺牲电子供体，研究了BBC在光催化降解同时产氢方面的性能。与无模板的BiVO-CdS相比，BBC表现出更高的光催化降解性能（98.32%），这归因于复制了木材的层状多孔结构。由于多孔结构的存在，BBC具有更好的吸附性能，加速了光降解和氢气的产生过程。此外，CdS纳米颗粒的表面改性形成了Z型异质结，极大地抑制了光生电子-空穴复合。当RhB向BiVO和CdS提供电子时，它也会被轻木模板化的BiVO-CdS同时产生的h和·OH氧化而去除。BBC以更高的速率产氢（61.2 μmol g h），实现了双功能光催化。因此，这些结果支持利用木材残渣进一步开发双功能催化剂。
