Abstract In the current research water-soluble functional polymers (WSFP) were prepared via radical polymerization and purified by fractionation through ultrafiltration membranes with different molecular weights cut off (MWCO) of 30 and 100 kDa. The WSFPs were poly(3-acrylamide propyl) trimethyl ammonium chloride, P(ClAPTA), poly(2-acrylamido-2-methyl-1-propane sodium sulfonate, P(AMPSNa), and poly(3-methacrylamino propyl) dimethyl 3-sulfopropyl ammonium hydroxide, P(HMPDSPA). These polymers were characterized by Fourier transformed infrared spectroscopy (FT-IR) and thermogravimetry analysis (TGA). Using liquid-phase polymer-based retention technique (LPR), chromium [Cr(III) and Cr(VI)] retention was studied as a function of pH, polymer and chromium concentration, selectivity, maximum retention capacity, chromium elution capacity, and polymer regeneration through sorption and desorption studies. Results of FT-IR showed the characteristic absorption bands of the synthesized polymers. The decomposition temperatures of P(ClAPTA) were at 303.1 °C, and for P(AMPSNa) three decompositions temperatures were registered at 190.5 °C, 223.2 °C, and 304.8 °C. P(HMPDSPA) presented two important decomposition temperatures at 292.4 °C and 391.7 °C, respectively. Concerning to the retention of Cr(VI), it was maximal (100 %) when P(ClAPTA) was studied at pH 6. The maximum retention of Cr(III) (100 %) was achieved by P(AMPSNa) at pH 3. The optimum polymer:Cr mole ratio obtained was 10:1 for both Cr(VI) and Cr(III). The retention of Cr(VI) decreased due to the presence of interfering ions, and the hydrodynamic flow was almost constant during the ultrafiltration of polymer-Cr macromolecule.

中文翻译：

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功能性聚合物结合超滤膜去除铬离子

摘要 在目前的研究中，水溶性功能聚合物 (WSFP) 通过自由基聚合制备，并通过不同截留分子量 (MWCO) 为 30 和 100 kDa 的超滤膜分馏纯化。WSFP 是聚（3-丙烯酰胺丙基）三甲基氯化铵，P（ClAPTA），聚（2-丙烯酰胺基-2-甲基-1-丙烷磺酸钠，P（AMPSNa）和聚（3-甲基丙烯酰胺丙基）二甲基 3 -磺丙基氢氧化铵，P(HMPDSPA)。这些聚合物通过傅里叶变换红外光谱 (FT-IR) 和热重分析 (TGA) 进行表征。使用液相聚合物基保留技术 (LPR)，铬 [Cr(III)和 Cr(VI)] 保留作为 pH 值、聚合物和铬浓度、选择性、最大保留能力、铬洗脱能力的函数进行研究，通过吸附和解吸研究进行聚合物再生。FT-IR 的结果显示了合成聚合物的特征吸收带。P(ClAPTA) 的分解温度为 303.1 °C，而 P(AMPSNa) 的三个分解温度分别为 190.5 °C、223.2 °C 和 304.8 °C。P(HMPDSPA) 的两个重要分解温度分别为 292.4 °C 和 391.7 °C。关于 Cr(VI) 的保留，当研究 P(ClAPTA) 在 pH 6 时达到最大 (100 %)。在 pH 3 时通过 P(AMPSNa) 实现了 Cr(III) 的最大保留 (100 %) . 对于 Cr(VI) 和 Cr(III)，获得的最佳聚合物:Cr 摩尔比为 10:1。由于干扰离子的存在，Cr(VI) 的保留率降低，并且在聚合物-Cr 大分子的超滤过程中流体动力流动几乎恒定。