文献类型：期刊文献

英文题名：Graphene quantum dots-bridged Fe-Ce bimetallic aerogel catalyst for efficient alkaline Fenton removal of three nitrogen species (NH3-N, NO3--N, and NO2--N)

作者：Li, Jie[1];Yang, Yuxiang[1,3];Zhang, Jining[2];Yao, Pingping[1];Huang, Yan[1];Dai, Anbang[3]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China;[3]Nanjing Univ, Coordinat Chem Inst, Nanjing 210093, Peoples R China

年份：2026

卷号：306

外文期刊名：ENVIRONMENTAL RESEARCH

收录：;EI(收录号：20262721039892);Scopus(收录号：2-s2.0-105043598488);WOS:【SCI-EXPANDED(收录号:WOS:001816186700001)】；

基金：This work was supported by the National Natural Science Foundation of China (20577010, 20971043) , the Fundamental Research Funds for the Central Universities, and the Open Project Program of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University.

语种：英文

外文关键词：Heterogeneous Fenton; Surface-bound radicals; Iron-cerium bimetal; Graphene quantum dots; "Three nitrogen species (NH3-N, NO3-,-N, and NO2--N)" transformation; Alkaline Fenton

摘要：A novel Fe-Ce/SiO2-GQDs heterogeneous Fenton catalyst was developed for efficient removal of nitrogenous pollutants from water. Fe and Ce were incorporated into a silica aerogel support by co-precipitation, and graphene quantum dots (GQDs) were immobilized onto the Fe-Ce/SiO2 surface through EDC/NHS-assisted grafting. Structural and chemical characterization by SEM, XRD, FT-IR, Raman, BET, and XPS confirmed the successful construction of a porous bimetallic catalyst with uniformly distributed Fe, Ce, and carbon species. The final Fe-Ce/SiO2-GQDs composite retained a relatively high specific surface area (238 m2/g) and mesoporous structure, providing abundant accessible sites and favorable mass transfer. Under optimized conditions (pH 9.0, Fe/Ce molar ratio 2:1, and H2O2 concentration 80 mmol/L), the catalyst achieved conversion efficiencies of 77.0% for NH3-N, 68.2% for NO3--N, and 66.7% for NO2--N. The conversion process followed pseudo-first-order kinetics and was dominated by surface-bound hydroxyl radicals. The excellent catalytic behavior was mainly attributed to the synergistic Fe3+/Fe2+ and Ce4+/Ce3+ redox cycles, while oxygen-containing groups and the conductive carbon framework of GQDs promoted pollutant enrichment and interfacial electron transfer. The catalyst maintained more than 85% of its initial activity after six reuse cycles and exhibited low Fe/Ce leaching, indicating good structural stability and alkaline adaptability. This work provides a feasible strategy for overcoming the pH limitation, iron-sludge generation, and recovery challenges associated with conventional homogeneous Fenton systems in wastewater treatment. Additional tests in representative complex matrices further suggest preliminary practical relevance, although broader validation in real wastewater systems is still required.