Preparation of ultrahigh-water-content nanofiber composite hydrogel for Cd2+ removal
Preparation of ultrahigh-water-content nanofiber composite hydrogel for Cd2+ removal
复制标题
超高含水量纳米纤维复合水凝胶的制备用于去除Cd2
DOI：
10.1002/jctb.6636
复制
发表时间：
2020
影响因子：
3.4
通讯作者：
Sihua Liu
中科院分区：
文献类型：
--
作者：
Jue Hu;Xin Huang;Jianmin Huang;Guiyin Zhou;Thein Tun;Jianxin Tang;Sihua Liu
BACKGROUNDThe 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.RESULTSThe adsorption of Cd2+on the NC hydrogel could rapidly achieve the equilibrium and the maximum adsorption capacity (qmax) of 76.92 mg g−1at 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 × 10−10m2s−1at 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.CONCLUSIONThese 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
