Highly efficient and selective removal of anionic dyes from aqueous solutions using polyacrylamide/peach gum polysaccharide/attapulgite composite hydrogels with positively charged hybrid network.

Int J Biol Macromol

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China; School of Rail Transportation, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China. Electronic address:

Published: May 2024

AI Article Synopsis

  • Researchers enhanced the adsorption properties of peach gum polysaccharide (PGP) by creating ammoniated (APGP) and quaternized (QPGP) forms, and bi-functionalizing attapulgite (ATP) with cation groups and carbon-carbon double bonds.
  • They developed hydrogels (PAAm/APGP and PAAm/QPGP/ATP) using redox polymerization and tested their properties and dye adsorption capabilities with various analytical techniques, including FTIR and SEM.
  • The PAAm/QPGP/ATP hydrogel displayed superior dye adsorption performance compared to PAAm/APGP, reaching equilibrium in about 20 minutes and showing high capacity for anionic dyes, making it a promising candidate for water

Article Abstract

To avoid the weakness (lower adsorption rate and selectivity) of peach gum polysaccharide (PGP) and improve the adsorption performance of polyacrylamide (PAAm) hydrogel (lower adsorption capacity), in the present work, the PGP was chemically tailored to afford ammoniated PGP (APGP) and quaternized PGP (QPGP), and attapulgite (ATP) was bi-functionalized with cation groups and carbon‑carbon double bond. Then, PAAm/APGP and PAAm/QPGP/ATP hydrogels were synthesized via redox polymerization. The synthesis procedure and properties of hydrogels were traced by FTIR, SEM, XPS, TGA, TEM, and BET methods, and the dye adsorption performance of the hydrogels was evaluated using the new coccine (NC) and tartrazine (TTZ) aqueous solutions as the model anionic dyes. Effects of initial dye concentration, pH, and ionic strength on the adsorption were investigated. Compared with PAAm/APGP hydrogel, PAAm/APGP/ATP hydrogel exhibits higher adsorption rate, superior adsorption capacity, stability, and selectivity towards anionic dye. The adsorption process of PAAm/QPGP/ATP hydrogel reached equilibrium in about 20 min and followed the pseudo-second-order kinetic model and Langmuir isotherm. The adsorption capacities towards NC and TTZ of PAAm/QPGP/ATP hydrogel were calculated as 873.235 and 731.432 mg/g. This hydrogel adsorbent originating from PAAm, PGP, and ATP shows great promise for application in practical water treatment.

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http://dx.doi.org/10.1016/j.ijbiomac.2024.131213DOI Listing

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