State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes, Tiangong University, Tianjin 300387, China; School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China; Tianjin Engineering Center for Safety Evaluation of Water & Safeguards Technology, Tianjin 300387, China.
State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes, Tiangong University, Tianjin 300387, China; School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China.
J Colloid Interface Sci. 2021 Apr 15;588:749-760. doi: 10.1016/j.jcis.2020.11.107. Epub 2020 Nov 30.
Removing hexavalent chromium (Cr(VI)) from aqueous solution is strategically important. A novel and selective adsorbent was synthesized using a high electron beam irradiation pre-grafting and post-surface ion imprinting method using Cr(VI) and polypropylene (PP) fibers as the template and substrates, respectively. The results obtained using Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TG) indicated that the prepared sorbent was successfully synthesized. At the same time, the adsorption performances were studied through batch experiments. The results exhibited rapid adsorption kinetics, a wide working pH range, and excellent selectivity and regeneration. The equilibrium adsorption was achieved within 30 min, the maximum sorption capacity of Cr(VI)-IIPs was 156.5 mg g and partition coefficients (PC) was 0.591 mg g uM at 400 mg L initial concentration and 298 K. The relative selectivity coefficients of the ion-imprinted polymer (IIP) for CrO/HPO and CrO/NO were 36.7 and 39.9, respectively. In addition, the prepared sorbent has a negligible loss in adsorption capacity after five cycles. IIP has good application prospects in the selective removal of Cr(VI) ions.
从水溶液中去除六价铬（Cr(VI)）具有重要的战略意义。本研究采用电子束辐照预接枝和表面后离子印迹技术，以 Cr(VI)和聚丙烯（PP）纤维分别作为模板和基质，合成了一种新型的选择性吸附剂。傅里叶变换红外（FTIR）光谱、X 射线光电子能谱（XPS）和热重分析（TG）结果表明，成功合成了所制备的吸附剂。同时，通过批量实验研究了吸附性能。结果表明，该吸附剂具有快速吸附动力学、较宽的工作 pH 范围、优异的选择性和再生性能。在初始浓度为 400mg/L 和 298K 时，Cr(VI)-IIPs 的平衡吸附时间为 30min，最大吸附容量为 156.5mg/g，分配系数（PC）为 0.591mg/g·µM。离子印迹聚合物（IIP）对 CrO/HPO 和 CrO/NO 的相对选择性系数分别为 36.7 和 39.9。此外，制备的吸附剂在五次循环后吸附容量损失可忽略不计。IIP 在选择性去除 Cr(VI)离子方面具有良好的应用前景。
