Journal
ENVIRONMENTAL RESEARCH
Volume 179, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2019.108839
Keywords
Multifunctional tetrapolymer hydrogel; In situ allocations of monomers; Response surface methodology; XPS-/ FTIR-Based adsorption mechanism; Adsorbed microstructural analyses
Funding
- Department of Science and Technology (DST), Government of India [YSS/2015/000886]
- Government of West Bengal [99(Sanc.)/ST/P/ST/15G-2/2015]
- DST, Government of India [IF160386]
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For circumventing the cumbersome and expensive multifunctional and multipolymer adsorbents for high-performance removals of hazardous water-contaminant(s), chitosan-g-[2-acrylamido-2-methyl-1-propanoic acid (AMPS)-co-2-(3-acrylamidopropanamido)-2-methylpropane-1-sulfonic acid (APAMPS)-co-2-(N-(3-amino-3-oxopropyflacrylamido)-2-methylpropane-1-sulfonic acid (NAOPAMPS)-co-acrylamide (AM)] (i.e., chitosan-g-tetrapolymer), a multifunctional scalable and reusable hydrogel, was synthesized by grafting of chitosan and in situ attachments of N-H functionalized NAOPAMPS and APAMPS hydrophilic acrylamido-monomers during free-radical solution-polymerization of the two ex situ added AMPS and AM monomers in water. The response surface methodology was employed to synthesize one hydrogel envisaging the optimum balance between swelling and stability for the superadsorption of Cu(II), Cd(II), Pb(II), Cr2O72-, and HPO42-. The in situ attachments of NAOPAMPS and APAMPS, grafting of chitosan into tetrapolymer, structures and properties, pH-responsive abilities, superadsorption mechanism, and reusability were understood via in depth microstructural analyses of adsorbed and/or unadsorbed chitosan-g-tetrapolymer(s) through H-1/C-13 NMR, FTIR, XPS, TGA, XRD, DLS, and pH(PZC). The maximum adsorption capacities of Cd(II), Cu(II), Pb(II), Cr2O72-, and HPO42- were 1374.41, 1521.08, 1554.08, 47.76, and 32.76 mg g(-1), respectively.
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