Preparation and optimization of low-cost red mud based zero-valent iron porous adsorbent by carbothermal reduction and Box-Behnken response method

• DOI: 10.1016/j.eti.2023.103376
• Publication Date: 2023-09-25T22:14:15Z
• Authors: Yufeng Du; Zhigang Yang; Linxu Xu; Xue Shen; Mingrui Shao; Feiyong Chen; Jin Wang
• Keywords: Red Mud; Carbothermic reaction; Bentonite; Zerovalent iron; Alkalinity; Specific surface area

Red mud is a polluting waste product emitted from the aluminum production industry, which potential threat to environment due its high yield, strong alkalinity and complex elemental composition. The resource utilization of red has also attracted attention many researchers. In this study, mud, straw bentonite were used as raw materials prepare granular porous zero valent iron (ZVI) adsorption reaction (Fe/GSBR) by carbothermal reduction. Straw was pore-forming reducing agent, binder, substrate source. effects preparation conditions on Fe/GSBR properties investigated, including material ratio, sintering temperature, time particle size. optimized response surface analysis, best determined follows: ratio 1:2, temperature 906℃, 60 min, size 100 mesh. characterized SEM, EDS, XRD, BET demonstrate ZVI material. addition, regeneration toxic leaching evaluated ensure environmental safety during use.