C2MA, IMT Mines Ales, Univ. Montpellier, Ales, France.
C2MA, IMT Mines Ales, Univ. Montpellier, Ales, France; Department of Environmental Engineering, College of Chemistry and Environmental Engineering, Shenzhen University, PR China.
Carbohydr Polym. 2019 Dec 1;225:115177. doi: 10.1016/j.carbpol.2019.115177. Epub 2019 Aug 12.
Highly percolating membranes are prepared by the interaction of polyethylenimine and alginate (with glutaraldehyde crosslinking). SEM illustrates the macroporous structure of the material. The material is characterized by FTIR before and after chromate anions sorption. Batch-simulated continuous sorption experiments revealed that the maximum sorption occurred at pH 2 and the flow rate has limited effect on sorption efficiency. Uptake kinetics and sorption isotherms are well fitted by the pseudo-second-order rate and Sips equations, respectively. Maximum sorption is found close to 314 mg g. Competition effects from Ca(II), Cu(II), Cl, NO, and SO are investigated to evaluate sorbent selectivity. The membranes are applied to remediate a simulate of Cr(VI) contaminated electroplating wastewater. Successive cycles of sorption and desorption show that the membranes maintain sorption capacity higher than 200 mg Cr g for both Cr(VI) and total chromium for the first two cycles. These new highly percolating membranes have promising performances for Cr(VI) removal.
高度渗透膜是通过聚乙烯亚胺和海藻酸钠（用戊二醛交联）相互作用制备的。SEM 说明了材料的大孔结构。在铬酸阴离子吸附前后，用 FTIR 对材料进行了表征。批处理模拟连续吸附实验表明，最大吸附发生在 pH 值为 2，流速对吸附效率的影响有限。吸附动力学和吸附等温线分别很好地符合拟二级速率和 Sips 方程。最大吸附接近 314mg/g。考察了 Ca(II)、Cu(II)、Cl、NO 和 SO 的竞争效应，以评估吸附剂的选择性。该膜用于修复含 Cr(VI)的电镀废水的模拟污染。吸附和解吸的连续循环表明，在前两个循环中，对于 Cr(VI)和总铬，该膜的吸附容量均保持在 200mgCr/g 以上。这些新型高渗透膜在去除 Cr(VI)方面表现出良好的性能。
