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- Title
Preparation of ultrahigh‐water‐content nanofiber composite hydrogel for Cd<sup>2+</sup> removal.
- Authors
Huang, Xin; Hu, Jue; Huang, Jianmin; Zhou, Guiyin; Tun, Thein; Tang, Jianxin; Liu, Sihua
- Abstract
BACKGROUND: The rising volumes of industrial wastewater discharge are causing an ecological crisis, which has become a challenge for humans. Herein, a novel ultrahigh‐water‐content nanofiber composite (NC) hydrogel was prepared as an efficient adsorbent for cadmium ion (Cd2+). This hydrogel has a porous and loose 3D cross‐linked structure and the polymer chains are interspersed with titanium dioxide (TiO2) nanofibers, which provide a supporting framework for the NC hydrogel. RESULTS: The adsorption of Cd2+ on the NC hydrogel could rapidly achieve the equilibrium and the maximum adsorption capacity (qmax) of 76.92 mg g−1 at pH 7 and 293 K. The intraparticle diffusion was the rate‐controlling step in the adsorption process, however, the diffusion coefficient (D) was just 2.57 × 10−10 m2 s−1 at 298 K, much lower than that of activated carbon. After five adsorption–desorption cycles, the NC hydrogel still maintained a certain adsorption efficiency, obtaining a regenerability close to 95.8%. Simultaneously, results of X‐ray photoelectron spectroscopy analysis revealed that the adsorption was mainly caused by the ion exchange between Cd2+ and calcium ion (Ca2+), and partly due to the chemisorption of Cd2+ by hydroxyl groups. CONCLUSION: These results suggest that the innovative NC hydrogel can be a potential adsorbent material for removing heavy metal ions from industrial effluent. © 2020 Society of Chemical Industry
- Subjects
SOCIETY of Chemical Industry (Great Britain); HYDROGELS; ACTIVATED carbon; X-ray photoelectron spectroscopy; CALCIUM ions; INDUSTRIAL wastes; SEWAGE
- Publication
Journal of Chemical Technology & Biotechnology, 2021, Vol 96, Issue 5, p1237
- ISSN
0268-2575
- Publication type
Article
- DOI
10.1002/jctb.6636