聚胍修饰抗菌型海水提铀材料

Polyguanidine modified antibacterial adsorbent for uranium extraction from seawater

通过聚六亚甲基盐酸胍(PHGC)和偕胺肟基(AO)在戊二醛条件下的交联作用,制备出一种具有高效抗菌性的新型海水提铀材料(PAM-AO-PHGC).使用傅里叶转换红外光谱(FT-IR)和扫描电子显微镜(SEM)表征材料表面的官能团和形貌.通过吸附实验研究了不同吸附条件下(pH、盐离子浓度和吸附时间)的铀吸附性能. PAM-AO-PHGC在模拟海水中的平衡吸附容量达到231.0 mg·g-1,吸附过程符合准二阶动力学方程.材料在海水pH(8.0)和高盐离子浓度(0.5 mol/L NaCl)的条件下,均表现出优异的铀吸附性能.此外, PAM-AO-PHGC可有效抑制大肠杆菌、金黄色葡萄球菌和海洋中广泛存在的两种弧菌的生长,聚胍的引入有望解决海水提铀材料在使用过程中的生物污损问题.

A new type of adsorbent with efficient antibacterial activity(PAM-AO-PHGC) for uranium extraction from seawater was prepared by crosslinking of polyhexamethylene guanidine hydrochloride(PHGC) and amidoxime group(AO) under the condition of glutaraldehyde. The functional groups and morphology of the material were characterized by Fourier transform infrared spectroscopy(FT-IR) and scanning electron microscopy(SEM). The uranium adsorption performance of PAM-AO-PHGC under different adsorption conditions(pH, salt ionic concentration and adsorption time) was studied by adsorption experiments. The equilibrium adsorption capacity of PAM-AO-PHGC in simulated seawater reaches 231.0 mg·g-1, and the adsorption process conforms to the pseudo-second-order kinetic equation. Under the conditions of seawater pH(8.0) and high salt ion concentration(0.5 mol/L NaCl), the adsorbent exhibits excellent uranium adsorption efficiency. In addition, PAM-AO-PHGC can effectively inhibit the growth of E. coli,S. aureus, and two types of vibrios which are ubiquitous in the ocean. The introduction of polyguanidine has great potential to solve the biofouling problem in the process of uranium extraction from seawater.