The development of highly dispersed metal-based materials loaded on carbon is of great importance for environmental remediation. However, their catalytic activities face huge challenges. In this study, a series of super activated carbon-supported Fe-Al layered double hydroxides (FeAl-LDH@SAC x ) were prepared, and the peroxymonosulfate (PMS) oxidation performance and activation mechanism were probed with Rhodamine B (RhB) as a representative pollutant. Results showed that FeAl-LDH@SAC 0.02 composites exhibited superior ability in activating PMS compared to other catalysts, as evidenced by the rate constants for RhB degradation, which followed the order: FeAl-LDH@SAC 0.02 (0.5507 min −1 )>FeAl-LDH@SAC 0.04 (0.4738 min −1 )>FeAl-LDH (0.4121 min −1 )>FeAl-LDH@SAC 0.01 (0.3512 min −1 )>FeAl-LDH@SAC 0.08 (0.2701 min −1 ). The optimal doping amount for SAC depended on the ratio of active FeAl-LDH and its dispersion on the SAC, which helped to promote interfacial electron transfer. Impressively, the sulfate radicals (SO 4 · − ), hydroxyl radical (·OH), and singlet oxygen ( 1 O 2 ) made major contributions to RhB removal. The results of the toxicity assessment showed that the overall toxicity of the system tended to decrease as the catalytic oxidation proceeded. Finally, the effective removal of aromatic proteins and soluble microbial metabolites in actual dye wastewater within 60 min demonstrated that the catalytic oxidation system involving FeAl-LDH@SAC 0.02 was promising for water treatment.
Coal gasification fine slag (CGFS), a typical coal-based solid waste, poses significant environmental challenges with an annual output exceeding 50 million tons in China. The complex distribution of carbon and ash components necessitates the development of a material that can effectively harness both carbon and ash for comprehensive utilization. While layered double hydroxides (LDHs) exhibit catalytic potential, their performance is often limited by severe particle aggregation. Herein, we engineered a robust carbon-anchored Fe-Al-LDH composite (CGFS-LDH) through hydrothermal co-precipitation, demonstrating exceptional efficacy in H 2 O 2 activation for phenol degradation. Remarkably, CGFS-LDH achieved 100 % removal of 200 mg L −1 phenol within 60 min. Advanced characterization (XPS, XRD, EPR, LC-MS, and electrochemical analysis) revealed that CGFS serves dual roles: as a structural scaffold preventing LDH aggregation and as an electron shuttle promoting Fe 2+ /Fe 3+ redox cycling. Although trace amounts of Fe (0.2 wt%) and Al (0.3 wt%) leached due to dynamic precipitation-dissolution equilibrium, the catalyst maintained outstanding stability over multiple cycles, with negligible activity loss. This work introduces an effective strategy for the comprehensive utilization and high-value transformation of CGFS, while also providing novel insights into the development of highly efficient and stable porous nanocomposites catalysts.
危险品化学品经营许可证（带存储）