CSIC Department, Post Graduate Institute of Medical Education and Research(PGIMER), Chandigarh, India.
Department of Chemistry, Sri Guru Granth Sahib World University, Fatehgarh Sahib, Punjab, India.
Chemosphere. 2021 Jun;272:129648. doi: 10.1016/j.chemosphere.2021.129648. Epub 2021 Jan 13.
Heavy metal ions and pesticides are the noteworthy toxic substances which must be removed from contaminated water for safeguarding public health. The higher levels of these substances in natural water may adversely affect the human health, climate and the eco-framework. The adsorptive removal of hazardous constituents employing metal organic frameworks has drawn considerable attention of researchers during the last decade. From this point of view, single crystal of calcium fumarate [Ca(CHO) (HO)(CHOH)] has been developed and analyzed by single crystal X-ray crystallography which confirmed the formation of 3-D metal organic frameworks (MOFs). The synthesized MOFs was employed for simultaneous adsorptive removal of imidacloprid, a high consumption pesticide, and highly toxic Cd (II) from aqua ecosystem. The effect of variation in experimental conditions such as solution pH, adsorbent dosage, contact time, initial concentration and temperature on adsorption was systematically evaluated. Both the imidacloprid and Cd(II) exhibited maximum adsorption at pH 6.5 and 7.8, respectively. The equilibrium empirical data was fitted into Langmuir, Freundlich and Temkin isotherms. The adsorption capacity of CaFu MOFs was observed to be 467.23 and 781.2 mg g for imidacloprid and cadmium ions, respectively. The adsorbed pollutants were desorbed from the adsorbent using dilute HCl, and the material was reused for five adsorption-desorption cycles without any appreciable loss of adsorption capacity. Therefore, the 3-D CaFu MOFs could be utilized as a novel material for adsorptive removal of imidacloprid pesticide as well as Cd (II) from wastewater.
重金属离子和农药是必须从受污染的水中去除的有害物质，以保障公众健康。这些物质在天然水中含量较高可能会对人类健康、气候和生态框架产生不利影响。在过去十年中，研究者们对利用金属有机骨架（MOFs）吸附去除危险成分的方法产生了浓厚的兴趣。从这个角度来看，已经通过单晶 X 射线晶体学开发和分析了富马酸钙 [Ca(CHO)(HO)(CHOH)] 的单晶，证实了 3-D MOFs 的形成。所合成的 MOFs 用于同时吸附去除高消耗农药——吡虫啉和来自水生生态系统的高毒性 Cd(II)。系统地评估了实验条件（如溶液 pH 值、吸附剂用量、接触时间、初始浓度和温度）变化对吸附的影响。吡虫啉和 Cd(II)在 pH 值为 6.5 和 7.8 时均表现出最大吸附。平衡经验数据拟合到 Langmuir、Freundlich 和 Temkin 等温线。CaFu MOFs 的吸附容量分别为 467.23 和 781.2 mg g 用于吸附吡虫啉和镉离子。使用稀 HCl 从吸附剂上解吸吸附的污染物，并且该材料在五个吸附-解吸循环中没有任何明显的吸附容量损失而被重复使用。因此，3-D CaFu MOFs 可以用作从废水中吸附去除吡虫啉农药和 Cd(II)的新型材料。
