Highly efficient removal of hexavalent chromium by magnetic Fe–C composite from reed straw and electric furnace dust waste

• Published in: Environmental science and pollution research international Vol. 30; no. 12; pp. 33737 - 33755
• Main Authors: Wang, Fu-Ping, Zeng, Ya-Nan, Wang, Yi-Tong, Li, Jun-Guo, Zhang, Xi, Ji, Ai-Min, Kang, Le-Le, Ji, Rui, Yu, Qing, Gao, Di, Wang, Xiao-Man, Fang, Zhen
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.03.2023
• Subjects: Adsorption; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Charcoal - chemistry; Chromium - chemistry; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Iron - chemistry; Magnetic Phenomena; Research Article; Waste Water Technology; Water Management; Water Pollutants, Chemical - analysis; Water Pollution Control; Magnetic composite; Electric furnace dust; Reed straw; Cr(VI); Biochar
• ISSN: 1614-7499; 1614-7499
• DOI: 10.1007/s11356-022-24491-7

Reed straw and electric furnace dust (EFD) waste were used to prepare magnetic Fe–C composite (EFD&C) by co-precipitation and high-temperature activation method to remove Cr(VI) from water. The magnetic EFD&C owned a large specific surface (536.61 m 2 /g) and a porous structure (micropores and mesopores), and had an efficient removal capacity for Cr(VI). Under conditions of pH (2), the addition amount of EFD&C (1 g/L), the adsorption time (760 min), and the temperature (45 °C), the maximum adsorption capacity reached 111.94 mg/g. The adsorption mechanism mainly attributed to chemical adsorption (redox), Cr(VI) reduced to Cr(III) by Fe(II) and Fe(0) (from Fe 3 O 4 and Fe components in EFD) and surface functional groups of -OH, C = C, C–C and O-C = O (from biochar), and secondary attributed to physical adsorption, Cr(VI) and Cr(III) (from reduced Cr(VI)) adsorbed into the porous structure of EFD&C. This study provided a feasible solution for the preparation of adsorbents for adsorbing heavy metals from iron-containing metallurgical solid waste and biomass waste, which contributed to reducing the environmental pollution and lowering the cost of adsorbent preparation. Graphical Abstract