Adly Mina Shawky, El-Dafrawy S M, Ibrahim Amr A, El-Hakam S A, El-Shall M Samy
Department of Chemistry, Virginia Commonwealth University Richmond VA 23284-2006 USA
Department of Chemistry, Faculty of Science, Mansoura University Mansoura 35516 Egypt
RSC Adv. 2021 Apr 13;11(23):13940-13950. doi: 10.1039/d1ra00927c.
A highly porous adsorbent based on a metal-organic framework was successfully designed and applied as an innovative adsorbent in the solid phase for the heavy metal removal. MIL-125 was densely decorated by 2-imino-4-thiobiuret functional groups, which generated a green, rapid, and efficacious adsorbent for the uptake of Hg(ii) and Pb(ii) from aqueous solutions. ITB-MIL-125 showed a high adsorption affinity toward mercury(ii) ions of 946.0 mg g due to covalent bond formation with accessible sulfur-based functionality. Different factors were studied, such as the initial concentration, pH, contact time, and competitive ions, under same circumstances at the room temperature. Moreover, the experimental adsorption data were in excellent agreement with the Langmuir adsorption isotherm and pseudo-second order kinetics. At a high concentration of 100 ppm mixture of six metals, ITB-MIL-125 exhibited a high adsorption capacity, reaching more than 82% of Hg(ii) compared to 62%, 30%, 2%, 1.9%, and 1.6% for Pb(ii), Cu(ii), Cd(ii), Ni(ii), and Zn(ii), respectively.
一种基于金属有机框架的高孔隙率吸附剂被成功设计并用作固相中的创新吸附剂以去除重金属。MIL-125被2-亚氨基-4-硫代缩二脲官能团密集修饰，从而产生了一种绿色、快速且高效的吸附剂，用于从水溶液中摄取Hg(ii)和Pb(ii)。由于与可及的硫基官能团形成共价键，ITB-MIL-125对汞(ii)离子表现出946.0 mg g的高吸附亲和力。在室温下的相同条件下，研究了不同因素，如初始浓度、pH值、接触时间和竞争离子。此外，实验吸附数据与朗缪尔吸附等温线和伪二级动力学非常吻合。在100 ppm六种金属的高浓度混合物中，ITB-MIL-125表现出高吸附容量，Hg(ii)的吸附率超过82%，而Pb(ii)、Cu(ii)、Cd(ii)、Ni(ii)和Zn(ii)的吸附率分别为62%、30%、2%、1.9%和1.6%。
