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    Polymer nano-rings with uranium specific clefts for selective recovery of uranium from acidic effluents via reductive adsorption

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    Type
    Article
    Authors
    Kushwaha, Shilpi
    Mane, Manoj Vasisht cc
    Ravindranathan, Sapna
    Das, Amitava
    KAUST Department
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Date
    2020-09-25
    Online Publication Date
    2020-09-25
    Print Publication Date
    2020-10-23
    Permanent link to this record
    http://hdl.handle.net/10754/665380
    
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    Abstract
    Nanostructured polymeric materials, functionalized with appropriate receptor have opened up newer possibilities for designing a reagent that shows analyte-specific recognition and efficient scavenging of an analyte that has either detrimental influence for human physiology and environment or for its recovery for further value addition. Higher active surface area, morphological diversity, synthetic tuneability for desired surface functionalization, and the ease of regeneration of nanostructured material for further use have provided such material with a distinct edge over conventional reagents. Use of biodegradable polymeric backbone has an added significance owing to the recent concern over the impact of polymer on the environment. Functionalization of biodegradable sodium alginate with AENA (6.85 % grafting) as the receptor functionality led to a unique open framework nanoring (NNRG) morphology with a favourable spatial orientation for specific recognition and efficient binding to uranyl ions (U) in an aqueous medium over a varied pH range. Nanoring morphology was confirmed by TEM and AFM images. The nano-scale design maximizes the surface area for the molecular scavenger. A combination of all these features along with the reversible bindingphenomenon has made NNRG as a superior reagent for specific, efficient uptake of UO2 2+ species from an acidic (pH 3-4) solution and compares better than all existing UO22+-scavengers reported till date. This could be utilized for recovery of uranyl species from a synthetic acidic effluent of the nuclear power. Results of the U uptake experiments reveal a maximum adsorption capacity of 268 mg of U per g of NNRG in synthetic nuclear effluent. XPS studies revealed a reductive complexation process and stabilization of U(IV)-species in adsorbed uranium species (U@NNRG).
    Citation
    Kushwaha, S., Mane, M., Ravindranathan, S., & Das, A. (2020). Polymer Nanorings with Uranium Specific Clefts for Selective Recovery of Uranium from Acidic Effluents via Reductive Adsorption. ACS Sensors, 5(10), 3254–3263. doi:10.1021/acssensors.0c01684
    Sponsors
    This work was supported by SERB research grants (S.K., SERB SB/FT/CS-072/2014). AD acknowledges SERB grants (EMR/2016/001850 & JCB/2017/000004) for financial support. The authors acknowledge the technical support from the CSIRNCL, Pune and CSIR-CSMCRI, Bhavnagar. S.K. is thankful to Dr. Ketan Patel, and Dr. Santanu Karan for their contribution during scientific discussions. A PRIS number (CSIR-CSMCRIñ 51/2020) has been assigned for this manuscript.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Sensors
    DOI
    10.1021/acssensors.0c01684
    Additional Links
    https://pubs.acs.org/doi/10.1021/acssensors.0c01684
    ae974a485f413a2113503eed53cd6c53
    10.1021/acssensors.0c01684
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; KAUST Catalysis Center (KCC)

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