Extraction of boron from aqueous solutions using selective resins is important in a variety of applications including desalination, ultrapure water production, and nuclear power generation. Today’s commercial boron-selective resins are exclusively prepared by functionalization of styrene-divinylbenzene (STY-DVB) beads with N-methylglucamine to produce resins with boron-chelating groups. However, such boron-selective resins have a limited binding capacity with a maximum free base content of 0.7 eq/L, which corresponds to a sorption capacity of 1.16 ± 0.03 mMol/g in aqueous solutions with equilibrium boron concentration of ~70 mM. In this article, we describe the synthesis and characterization of a new resin that can selectively extract boron from aqueous solutions. We show that branched polyethylenimine (PEI) beads obtained from an inverse suspension process can be reacted with glucono-1,5-d-lactone to afford a resin consisting of spherical beads with high density of boron-chelating groups. This resin has a sorption capacity of 1.93 ± 0.04 mMol/g in aqueous solution with equilibrium boron concentration of ~70 mM, which is 66% percent larger than that of standard commercial STY-DVB resins. Our new boron-selective resin also shows excellent regeneration efficiency using a standard acid wash with a 1.0 M HCl solution followed by neutralization with a 0.1 M NaOH solution.
展开▼
机译:使用选择性树脂从水溶液中提取硼在包括淡化,超纯水生产和核能发电在内的各种应用中都很重要。当今的商业化硼选择性树脂是通过将苯乙烯-二乙烯基苯(STY-DVB)珠与N-甲基葡糖胺官能化以制备具有硼螯合基团的树脂而专门制备的。但是,此类硼选择性树脂的结合能力有限,最大游离碱含量为0.7 eq / L,相当于在平衡硼浓度约为70 mM的水溶液中的吸附能力为1.16±0.03 mMol / g。在本文中,我们描述了可以从水溶液中选择性提取硼的新型树脂的合成和表征。我们表明,从反向悬浮过程中获得的支链聚乙烯亚胺(PEI)珠子可以与1,5-d-葡糖苷反应,得到由高密度的硼螯合基团的球形珠子组成的树脂。该树脂在水溶液中的吸附容量为1.93±0.04 mMol / g,平衡硼浓度为〜70 mM,比标准的STY-DVB树脂大66%。我们的新型硼选择性树脂在用1.0 M HCl溶液进行标准酸洗,然后用0.1 M NaOH溶液中和后,也表现出出色的再生效率。
展开▼