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(Zn/Co)-Zeolitic Imidazolate Frameworks: Room Temperature Synthesis and application as promising U(VI) scavengers – A comparative study
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.jiec.2020.10.012
Satvir Singh , B.S. Bajwa , Inderpreet Kaur

Abstract Uranium prevalence in water beyond WHO limit (30 µg/l) may pose potential chemical and radiological toxicity which can cause severe health problems associated with kidney, brain, liver, heart, etc. Therefore, regular monitoring of uranium content and development of efficient remediation strategies for its removal from water resources has gained immense attention at global level. In the present work, zeolitic imidazolate frameworks (ZIFs) based on zinc (ZIF-8), cobalt (ZIF-67) and bimetallic zinc & cobalt (Zn,Co-ZIF) using 2-methylimidazole as organic linker, were developed following a rapid room temperature synthesis, characterised for their surface and functional features using X-ray diffraction, SEM-EDX, BET and FT-IR followed by their application as adsorbents for uranium extraction. ZIFs were found to perform best at optimum adsorption parameters: pH (5.0), adsorbent dose (0.4 g/l) and contact time (120 min). The maximum Langmuir adsorption capacity (mg/g) of three ZIFs follows the order as: ZIF-8 (781.0) > Zn,Co-ZIF (564.7) > ZIF-67 (409.1). Thermodynamic parameters confirmed the spontaneous and endothermic nature of adsorption process. Three ZIFs exhibit high adsorption efficiency and regeneration ability were explored for their practical application as packing material in the columns used in water purifiers and found to serve as competent adsorbents for treatment of uranium contaminated groundwater samples.

中文翻译:

(Zn/Co)-沸石咪唑酯骨架:室温合成和作为有前途的 U(VI) 清除剂的应用——一项比较研究

摘要 水中铀含量超过 WHO 限值 (30 µg/l) 可能会造成潜在的化学和放射毒性,从而导致与肾脏、大脑、肝脏、心脏等相关的严重健康问题。因此,定期监测铀含量并开发有效的将其从水资源中去除的补救战略在全球范围内引起了极大的关注。在目前的工作中,基于锌 (ZIF-8)、钴 (ZIF-67) 和使用 2-甲基咪唑作为有机连接体的双金属锌和钴 (Zn,Co-ZIF) 开发了沸石咪唑骨架 (ZIF)。快速室温合成,使用 X 射线衍射、SEM-EDX、BET 和 FT-IR 表征其表面和功能特征,然后将其用作铀提取的吸附剂。发现 ZIF 在最佳吸附参数下表现最佳:pH (5.0)、吸附剂剂量 (0.4 g/l) 和接触时间 (120 分钟)。三种 ZIF 的最大朗缪尔吸附容量 (mg/g) 遵循以下顺序:ZIF-8 (781.0) > Zn,Co-ZIF (564.7) > ZIF-67 (409.1)。热力学参数证实了吸附过程的自发性和吸热性。探索了三种具有高吸附效率和再生能力的 ZIF 作为净水器柱中的填料的实际应用,并发现它们可作为处理铀污染地下水样品的有效吸附剂。ZIF-67 (409.1)。热力学参数证实了吸附过程的自发性和吸热性。探索了三种具有高吸附效率和再生能力的 ZIF 作为净水器柱中的填料的实际应用,并发现它们可作为处理铀污染地下水样品的有效吸附剂。ZIF-67 (409.1)。热力学参数证实了吸附过程的自发性和吸热性。探索了三种具有高吸附效率和再生能力的 ZIF 作为净水器柱中的填料的实际应用,并发现它们可作为处理铀污染地下水样品的有效吸附剂。
更新日期:2021-01-01
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