Budnyak Tetyana M, Piątek Jędrzej, Pylypchuk Ievgen V, Klimpel Matthias, Sevastyanova Olena, Lindström Mikael E, Gun'ko Volodymyr M, Slabon Adam
Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16 C, 106 91 Stockholm, Sweden.
Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden.
ACS Omega. 2020 May 5;5(19):10847-10856. doi: 10.1021/acsomega.0c00492. eCollection 2020 May 19.
Efficient and sustainable recycling of cobalt(II) is of increasing importance to support technological development in energy storage and electric vehicle industries. A composite material based on membrane-filtered lignin deposited on nanoporous silica microparticles was found to be an effective and sustainable sorbent for cobalt(II) removal. This bio-based sorbent exhibited a high sorption capacity, fast kinetics toward cobalt(II) adsorption, and good reusability. The adsorption capacity was 18 mg Co(II) per gram of dry adsorbent at room temperature (22 °C) at near-neutral pH, three times higher than that of the summarized capacity of lignin or silica starting materials. The kinetics study showed that 90 min is sufficient for effective cobalt(II) extraction by the composite sorbent. The pseudo-second-order kinetics and Freundlich isotherm models fitted well with experimentally obtained data and confirmed heterogeneity of adsorption sites. The promising potential of the lignin-silica composites for industrial applications in the cobalt recovering process was confirmed by high values of desorption in mildly acidic solutions.
高效且可持续地回收钴（II）对于支持储能和电动汽车行业的技术发展愈发重要。一种基于沉积在纳米多孔二氧化硅微粒上的膜过滤木质素的复合材料被发现是一种有效且可持续的吸附剂，用于去除钴（II）。这种生物基吸附剂表现出高吸附容量、对钴（II）吸附的快速动力学以及良好的可重复使用性。在室温（22°C）近中性pH条件下，每克干吸附剂的吸附容量为18毫克钴（II），比木质素或二氧化硅起始材料的总容量高三倍。动力学研究表明，90分钟足以让复合吸附剂有效提取钴（II）。准二级动力学和弗伦德利希等温线模型与实验获得的数据拟合良好，并证实了吸附位点的非均质性。在微酸性溶液中较高的解吸值证实了木质素 - 二氧化硅复合材料在钴回收过程中工业应用的广阔潜力。
