Abstract
Uranium prevalence in water beyond WHO limit (30μg/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 (0.4g/l) and contact time (120min). 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.
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