School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan, 450001, PR China.
School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan, 450001, PR China.
J Hazard Mater. 2022 Apr 5;427:128168. doi: 10.1016/j.jhazmat.2021.128168. Epub 2021 Dec 29.
Environmentally hazardous P(V), Mo(VI) and W(VI) generated oxyanions exist widely in the waste liquid of nonferrous hydrometallurgy. In this work, Fe-MOF material was simply prepared via solvothermal synthesis and then used as an adsorbent to remove P(V), Mo(VI) and W(VI) oxyanions from hydrometallurgical waste liquid. Several important parameters, including solution pH, oxyanion concentration, contact time, adsorbent amount, temperature and coexistent heavy metal ions, were systematically investigated. The results demonstrate that adsorption process was almost pH-independent over a broad range of pH 3.0-10.0. The adsorption efficiency was strongly associated with the chemical species of oxyanions. The higher polymerisation degree of oxyanions was more favourable for removal efficiency. Additionally, the maximum removal efficiencies for P(V), Mo(VI) and W(VI) oxyanions under optimum conditions were approximately 100%. Furthermore, the adsorption kinetics and isotherms of oxyanions on the adsorbent separately belonged to the pseudo-second-order and Langmuir isotherm models. XPS analysis revealed that inner-sphere complexation played a dominant role in the adsorption removal process. Fe-MOFs with pH-independent properties, abundant binding sites and high stability are prospective adsorbents for treating waste liquids in the hydrometallurgical industry.
环境危害性的 P(V)、Mo(VI) 和 W(VI) 生成的含氧阴离子广泛存在于有色金属湿法冶金的废液中。在这项工作中，通过溶剂热合成简单地制备了 Fe-MOF 材料，并将其用作吸附剂，从湿法冶金废液中去除 P(V)、Mo(VI) 和 W(VI) 含氧阴离子。系统研究了几个重要参数，包括溶液 pH 值、含氧阴离子浓度、接触时间、吸附剂用量、温度和共存重金属离子。结果表明，吸附过程在很宽的 pH 3.0-10.0 范围内几乎与 pH 值无关。吸附效率与含氧阴离子的化学物质密切相关。含氧阴离子的聚合度越高，去除效率越有利。此外，在最佳条件下，P(V)、Mo(VI) 和 W(VI) 含氧阴离子的最大去除效率约为 100%。此外，含氧阴离子在吸附剂上的吸附动力学和等温线分别属于准二级和 Langmuir 等温线模型。XPS 分析表明，内球络合在吸附去除过程中起主导作用。具有 pH 值独立性、丰富的结合位点和高稳定性的 Fe-MOFs 是处理湿法冶金工业废液的有前途的吸附剂。
