Liu Pu, Jia Weiwei, Ou Xiaojian, Liu Chunli, Zhang Jun, Chen Zhenbin, Li Xiaoming
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, Gansu, China.
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China.
ACS Omega. 2020 Sep 16;5(38):24356-24366. doi: 10.1021/acsomega.0c02634. eCollection 2020 Sep 29.
In this work, an ion imprinted polymer (ReO -IIP) of the perrhenate ion based on acrylamide (AM) and acrylic acid (AA) was prepared by solution polymerization using ReO as a template ion, ,-methylenebisacrylamide (NMBA) as cross-linkers, hydrogen peroxide-vitamin C (HO-Vc) as an initiator, and a mixed solution of water (HO) and methanol (CHOH) with volume ratio v(HO)/v(CHOH) = 3:7 as a solvent. During the process of synthesis condition investigation and optimization, the adsorption capacity () and the separation degree () in the equimolar concentration mixture solutions of NHReO and KMnO were adopted as indexes, and the obtained optimal conditions were as follows: the molar ratios of NMBA, NHReO, AA, HO, and Vc to AM were 5.73, 0.052, 1.29, 0.02, and 0.003, and the temperature and time of polymerization were 40 °C and 28 h, respectively. Under optimal conditions, the sample with indexes, and of 0.064 mmol/g and 3.20, were harvested. What is more, a further reusability study found that good adsorption selectivity was maintained after repeating the experiment 9 times. Taking the non-IP prepared under the same conditions as a control, Fourier transform infrared spectroscopy, transmission electron microscopy, and Brunauer Emmett Teller were used to characterize the structure of the ReO -IIP prepared under the optimal conditions. Finally, the kinetic study results showed that the zero-order kinetic model could better describe the adsorption process. The thermodynamic study results showed that the Langmuir model was more suitable for describing the isotherm adsorption process of the IIP.
在本研究中，以过铼酸根离子为模板离子，N,N'-亚甲基双丙烯酰胺（NMBA）为交联剂，过氧化氢 - 维生素C（H₂O₂ - Vc）为引发剂，水（H₂O）和甲醇（CH₃OH）体积比v(H₂O)/v(CH₃OH)=3:7的混合溶液为溶剂，通过溶液聚合制备了基于丙烯酰胺（AM）和丙烯酸（AA）的过铼酸根离子印迹聚合物（ReO₄⁻ - IIP）。在合成条件考察与优化过程中，采用NH₄ReO₄和KMnO₄等摩尔浓度混合溶液中的吸附容量（q）和分离度（α）作为指标，得到的最佳条件如下：NMBA、NH₄ReO₄、AA、H₂O₂和Vc与AM的摩尔比分别为5.73、0.052、1.29、0.02和0.003，聚合温度和时间分别为40℃和28 h。在最佳条件下，收获了q和α指标分别为0.064 mmol/g和3.20的样品。此外，进一步的重复使用性研究发现，重复实验9次后仍保持良好的吸附选择性。以相同条件下制备的非印迹聚合物为对照，采用傅里叶变换红外光谱、透射电子显微镜和布鲁诺尔 - 埃米特 - 泰勒（BET）法对最佳条件下制备的ReO₄⁻ - IIP的结构进行了表征。最后，动力学研究结果表明，零级动力学模型能更好地描述吸附过程。热力学研究结果表明，Langmuir模型更适合描述IIP的等温吸附过程。
