Jiang Yimei, Shen Zhengtao, Tang Chao-Sheng, Shi Bin
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China.
Sci Total Environ. 2023 Dec 10;903:166245. doi: 10.1016/j.scitotenv.2023.166245. Epub 2023 Aug 12.
The synthesis of layered double hydroxide (LDH) from industrial wastes is a sustainable approach to aid circular economy and hazardous material disposal. In this review, the researches on the synthesis and application of waste-based LDH from 2010 to 2023 are summarized and discussed. At present, there are mainly four types of waste-based LDH produced from red mud, slag, fly ash and wastewater, with co-precipitation being the most typical synthesis method. Red mud is used as the trivalent metal source supplemented by chemical reagents or other types of waste as divalent metal source to produce red mud-based LDH. Slag can act as the sole metal source providing both divalent and trivalent metal sources for slag-based LDH. Fly ash was used either as the trivalent metal source or both divalent and trivalent metal sources to produce fly ash-based LDH. Wastewater-based LDH was typically synthesized by in-situ co-precipitation method to achieve the self-purification of wastewater. The impurities in waste-based LDH can act as a two-edged weapon. It may either hinder or promote the performance of waste-based LDH. The challenge in the synthesis of waste-based LDH lies in the efficient extraction of available metals. The future research prospects for waste-based LDH are suggested.
利用工业废弃物合成层状双氢氧化物（LDH）是助力循环经济和危险物质处置的可持续方法。本综述总结并讨论了2010年至2023年基于废弃物的LDH的合成与应用研究。目前，主要有四种基于废弃物的LDH，由赤泥、矿渣、粉煤灰和废水制备而成，共沉淀法是最典型的合成方法。以赤泥作为三价金属源，辅以化学试剂或其他类型废弃物作为二价金属源来制备基于赤泥的LDH。矿渣可作为唯一的金属源，为基于矿渣的LDH提供二价和三价金属源。粉煤灰既用作三价金属源，也用作二价和三价金属源来制备基于粉煤灰的LDH。基于废水的LDH通常通过原位共沉淀法合成，以实现废水的自净化。基于废弃物的LDH中的杂质可能有利有弊，既可能阻碍也可能促进基于废弃物的LDH的性能。基于废弃物的LDH合成中的挑战在于有效提取可用金属。文中还提出了基于废弃物的LDH未来的研究前景。
