碳热还原和Box-Behnken响应法制备低成本赤泥基零价铁多孔吸附剂,Environmental Technology & Innovation

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碳热还原和Box-Behnken响应法制备低成本赤泥基零价铁多孔吸附剂
Environmental Technology & Innovation ( IF 6.7 ) Pub Date : 2023-09-25 , DOI: 10.1016/j.eti.2023.103376
Yufeng Du , Zhigang Yang , Linxu Xu , Xue Shen , Mingrui Shao , Feiyong Chen , Jin Wang

赤泥是铝生产行业排放的污染性废渣，其产量高、碱性强、元素成分复杂，对环境构成潜在威胁。赤泥的资源化利用也引起了众多研究者的关注。本研究以赤泥、秸秆和膨润土为原料，采用碳热还原法制备颗粒状多孔零价铁（ZVI）吸附反应材料（Fe/GSBR）。以秸秆为造孔减水剂，膨润土为粘结剂，赤泥为基质和铁源。研究了原料配比、烧结温度、烧结时间和秸秆粒径等制备条件对Fe/GSBR性能的影响。通过响应面分析对制备条件进行优化，确定最佳制备条件为：原料配比1：2、烧结温度906℃、烧结时间60 min、秸秆粒度100目。通过 SEM、EDS、XRD 和 BET 表征 Fe/GSBR 的性能，以证明多孔和 ZVI 材料。此外，还对材料的再生性能和有毒浸出进行了评估，以确保使用过程中的环境安全。

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

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

更新日期：2023-09-25

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