Vareda João P, Durães Luisa
a Department of Chemical Engineering, CIEPQPF , University of Coimbra , Coimbra , Portugal.
Environ Technol. 2019 Jan;40(4):529-541. doi: 10.1080/09593330.2017.1397766. Epub 2017 Nov 10.
Recently developed tailored adsorbents for heavy metal uptake are studied in batch tests with Cu, Pb, Cd, Ni, Cr and Zn, in order to decontaminate polluted environments where these heavy metals are found in solution - water courses and groundwater. The adsorbents feature mercapto or amine-mercapto groups that are capable of complexating the cations. Through the use of equilibrium tests it is found that a remarkably high heavy metal uptake is obtained for all metals (ranging from 84 to 140 mg/g). These uptake values are quite impressive when compared to other adsorbents reported in the literature, which is also due to the double functionalization present in one of the adsorbents. For the best adsorbent, adsorption capacities followed the order Cu(II) > Pb(II) > Zn(II) > Cr(III) > Cd(II) > Ni(II). With these adsorbents, the removal process was fast with most of the metals being removed in less than 1 h. Competitive sorption tests were performed in tertiary mixtures that were based on real world polluted sites. It was found that although competitive sorption occurs, affecting the individual removal of each metal, all the cations in solution still interact with the adsorbent, achieving removal values that make this type of material very interesting for its proposed application.
最近开发的用于重金属吸附的定制吸附剂，在批量试验中用于吸附铜、铅、镉、镍、铬和锌，以净化在溶液中发现这些重金属的污染环境——水道和地下水。这些吸附剂具有巯基或胺基巯基，能够络合阳离子。通过平衡试验发现，所有金属的重金属吸附量都非常高（范围为84至140 mg/g）。与文献中报道的其他吸附剂相比，这些吸附值相当可观，这也归因于其中一种吸附剂存在的双重功能化。对于最佳吸附剂，吸附容量顺序为Cu(II) > Pb(II) > Zn(II) > Cr(III) > Cd(II) > Ni(II)。使用这些吸附剂时，去除过程很快，大多数金属在不到1小时内被去除。在基于实际污染场地的三元混合物中进行了竞争吸附试验。结果发现，尽管发生了竞争吸附，影响了每种金属的单独去除，但溶液中的所有阳离子仍与吸附剂相互作用，实现的去除值使这种材料对于其拟议的应用非常有吸引力。
