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Development of oatmeal-based novel superabsorbent and moisture-retaining hydrogels: metal ion and dye removal applications

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Abstract

Research reports synthesis of eight different sets of OAT-g-PAM-cl-NN′-mba hydrogels via ‘conventional’ technique. Synthesis of novel hydrogels was optimized by varying monomer (acrylamide) and cross-linker (NN′-methylenebisacrylamide) concentrations along with fixed concentration of CAN (ceric ammonium nitrate). Confirmation of reaction was done using different physicochemical techniques namely 13C-CP/MAS solid-state NMR spectroscopy, FTIR, SEM and swelling study. Extensive swelling studies of novel hydrogels were recorded at different pH media (pH 2, 7 and 10), temperature conditions (25 °C, 35 °C and 45 °C), saline solution (5% NaCl, 10% NaCl and 15% NaCl) as well as w.r.to different time interval (12 h study in deionised water) up to achieving their equilibrium state. Reduction in the concentration of heavy metals and dye via absorption mechanism was also reported. As observed, with decreases in cross-linker concentration, there is an increase in percentage cross-linking of hydrogels and its water absorbance capacity was also found to be increased. Results suggest that synthesized hydrogels may be used commercially for environmental, industrial and agricultural applications.

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Acknowledgements

The authors deeply acknowledge the financial support received from DST-New Delhi, India, in the form of research grant (grant no. 08/12-09141). Analytical support from IISC-Bangalore and Central instrumentation facility, BIT-Mesra is heartily acknowledged.

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Correspondence to Srijita Bharti.

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Bharti, S., Mishra, S. Development of oatmeal-based novel superabsorbent and moisture-retaining hydrogels: metal ion and dye removal applications. Polym. Bull. 79, 8967–8986 (2022). https://doi.org/10.1007/s00289-021-03923-3

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  • DOI: https://doi.org/10.1007/s00289-021-03923-3

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