Tan Lijun, Liu Yanming, Zhu Genwang, Fan Xinfei, Quan Xie
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Sci Total Environ. 2023 Jun 1;875:162725. doi: 10.1016/j.scitotenv.2023.162725. Epub 2023 Mar 10.
Heterogeneous electro-Fenton with in situ generated HO and OH is a cost-effective method for the degradation of refractory organic pollutants, in which the catalyst is an important factor affecting its degradation performance. Metal-free catalysts can avoid the potential risk of metal dissolution. However, it remains great challenge to develop efficient metal-free catalyst for electro-Fenton. Herein, ordered mesoporous carbon (OMC) was designed as a bifunctional catalyst for efficient HO and OH generation in electro-Fenton. The electro-Fenton system showed fast perfluorooctanoic acid (PFOA) degradation with kinetics constant of 1.26 h and high total organic carbon (TOC) removal efficiency of 84.0 % after 3 h reaction. The OH was the main species responsible for PFOA degradation. Its generation was promoted by the abundant oxygen functional groups such as C-O-C and the nano-confinement effect of mesoporous channels on OMCs. This study indicated that OMC is an efficient catalyst for metal-free electro-Fenton system.
原位生成 HO 和 OH 的非均相电芬顿法是一种降解难降解有机污染物的经济有效方法，其中催化剂是影响其降解性能的重要因素。无金属催化剂可避免金属溶解的潜在风险。然而，开发用于电芬顿的高效无金属催化剂仍然是巨大的挑战。在此，有序介孔碳（OMC）被设计为一种双功能催化剂，用于在电芬顿中高效生成 HO 和 OH。电芬顿系统显示出快速的全氟辛酸（PFOA）降解，动力学常数为 1.26 h，反应 3 h 后总有机碳（TOC）去除效率高达 84.0%。OH 是负责 PFOA 降解的主要物种。其生成受到丰富的氧官能团如 C-O-C 以及介孔通道对 OMC 的纳米限域效应的促进。该研究表明 OMC 是无金属电芬顿系统的高效催化剂。
