Hamilton Andrea, Bots Pieter, Zhou Han, Liu Bao, Hall Christopher
Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, G1 1XJ, UK.
School of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211800, China.
Sci Rep. 2024 Mar 25;14(1):7052. doi: 10.1038/s41598-024-56617-x.
Cobalt is a critical resource in industrial economies for the manufacture of electric-vehicle batteries, alloys, magnets, and catalysts, but has acute supply-chain risks and poses a threat to the environment. Large-scale sequestration of cobalt in low-cost materials under mild conditions opens a path to cobalt recycling, recovery and environmental clean-up. We describe such sequestration of cobalt by a widely available commercial calcium silicate material containing the mineral xonotlite. Xonotlite rapidly and spontaneously takes up 40 percent of its weight of cobalt under ambient conditions of temperature and pressure and reduces dissolved cobalt concentrations to low parts per million. A new Sharp Front experimental design is used to obtain kinetic and chemical information. Sequestration occurs by a coupled dissolution-precipitation replacement mechanism. The cobalt silicate reaction product is largely amorphous but has phyllosilicate features.
钴是工业经济中制造电动汽车电池、合金、磁铁和催化剂的关键资源，但存在严重的供应链风险，并对环境构成威胁。在温和条件下将钴大规模螯合到低成本材料中，为钴的回收利用和环境清理开辟了一条道路。我们描述了一种含有硬硅钙石矿物的市售硅酸钙材料对钴的这种螯合作用。在常温常压环境条件下，硬硅钙石能迅速自发地吸收其重量40%的钴，并将溶解的钴浓度降低到百万分之几的低水平。采用一种新的锐锋实验设计来获取动力学和化学信息。螯合作用通过耦合溶解 - 沉淀置换机制发生。硅酸钴反应产物大部分是非晶态的，但具有层状硅酸盐特征。
