School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou, 510006, PR China.
China Water Resources Pearl River Planning Surveying & Designing Co. Ltd., Guangzhou, 510610, PR China.
Environ Res. 2022 Nov;214(Pt 4):114068. doi: 10.1016/j.envres.2022.114068. Epub 2022 Aug 13.
Kitchen-waste-derived biochar (KBC) was produced by thermal treatment at 400 °C, and a series of KBC/BiOX (X = Br, Cl) photocatalysts were developed using ultrasonication and solvothermal treatment. The as-prepared photocatalysts were characterized by several tests and investigated by photocatalytic reactions towards methyl orange (MO) and tetracycline (TC). The best photocatalysts, 0.15KBC/BiOBr and 0.15KBC/BiOCl separately achieved complete MO photodegradation in 20 min and 35 min. Further study confirmed that 0.15KBC/BiOBr and 0.15KBC/BiOCl possessed excellent photocatalytic efficiency that was 17.9 and 14.8 times higher than BiOBr and BiOCl, respectively. In addition, 0.15KBC/BiOX showed higher activity removal of TC than pure BiOX in 60 min. Notably, 0.15KBC/BiOX maintained a reproducible high photocatalytic efficiency after five recycles. Estimated band gap energy for 0.15KBC/BiOBr (2.40 eV) and 0.15KBC/BiOCl (3.00 eV) was considerably lower than that of BiOBr (2.73 eV) and BiOCl (3.30 eV), indicating a delocalized state was created when forming electronic pathways on the interface. Besides, visible-light harvesting of photocatalysts got promoted by the modification of KBC. Active species trapping experiments and electron paramagnetic resonance (EPR) tests illustrated that photogenerated holes were the principal active species, while ∙OH was involved in the reaction. The successful synthesis of 0.15KBC/BiOX catalyst provided a new approach on simultaneously degrading organic contaminants in water and disposing of excessive kitchen waste.
厨房废物衍生的生物炭（KBC）通过在 400°C 的热处理制备，并用超声处理和溶剂热处理制备了一系列 KBC/BiOX（X=Br、Cl）光催化剂。通过多种测试对所制备的光催化剂进行了表征，并通过光催化反应对甲基橙（MO）和四环素（TC）进行了研究。最佳的光催化剂，0.15KBC/BiOBr 和 0.15KBC/BiOCl 分别在 20 分钟和 35 分钟内实现了 MO 的完全光降解。进一步的研究证实，0.15KBC/BiOBr 和 0.15KBC/BiOCl 具有出色的光催化效率，分别比 BiOBr 和 BiOCl 高 17.9 和 14.8 倍。此外，0.15KBC/BiOX 在 60 分钟内对 TC 的去除活性高于纯 BiOX。值得注意的是，0.15KBC/BiOX 在五次循环后仍保持可重复的高光催化效率。0.15KBC/BiOBr（2.40 eV）和 0.15KBC/BiOCl（3.00 eV）的估计能带隙能量明显低于 BiOBr（2.73 eV）和 BiOCl（3.30 eV），表明在界面上形成电子途径时形成了离域态。此外，KBC 的修饰促进了光催化剂对可见光的捕获。活性物质捕获实验和电子顺磁共振（EPR）测试表明，光生空穴是主要的活性物质，而 ∙OH 参与了反应。0.15KBC/BiOX 催化剂的成功合成为同时降解水中有机污染物和处理过量厨房废物提供了一种新方法。
