4.7 Article

Nanocellulose fine-tuned poly(acrylic acid) hydrogel for enhanced diclofenac removal

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出版社

ELSEVIER
DOI: 10.1016/j.ijbiomac.2022.06.051

关键词

Nanocellulose hydrogel; Diclofenac adsorption; Cryo-SEM

资金

  1. National Natural Science Foundation of China [22006115]
  2. Shanghai Sailing Program [20YF1452200]
  3. Key-Area Research and Development Program of Guangdong Province [2020B0202080001]

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The study successfully developed a highly efficient nanocellulose-based poly(acrylic acid) hydrogel adsorbent by adjusting the properties of nanocellulose. The hydrogel exhibited a uniform 3D structure with abundant pores, leading to high adsorption capacity for pharmaceuticals and personal care products. The developed hydrogel has potential applications in wastewater treatment.
Hydrogel was recognized as one of the most promising materials for adsorption of pharmaceuticals and personal care products (PPCPs). The highly efficient bio-based nanocelluloses fine-tuned poly(acrylic acid) hydrogel (PAA/NC) adsorbent was constructed by adjusting aspect ratio, surface charge and crystallinity of NC. The cross-linked networks were fabricated through a single-step free-radical polymerization via steric effect and hydrogen bonds. The uniform three-dimensional structures with abundant macropores and mesopores were in-situ visualized by the cryogenic-scanning electron microscopy (Cryo-SEM). The diclofenac adsorption capacity of TEMPO oxidized cellulose nanofibers (TCNF) incorporated PAA hydrogel (PAA/TCNF, 559.8 mg.g(-1)) was circa 2.1 times higher than pristine PAA (293.5 mg.g(-1)) due to the elevated specific surface area, favorable spatial structure with unimpeded channels and abundant surface-charged carboxylic groups. Moreover, PAA/NC hydrogel exhibited a wide-pH applicability and high salinity tolerance. The adsorption was predominantly determined by hydrogen bonds, validated by XPS and FT-IR analysis. It was demonstrated developed PAA/NC hydrogel with unique porous structure significantly enhanced adsorption capacity for potential application in the purification of refractory organic pollutants-containing wastewater.

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