Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
J Hazard Mater. 2013 Sep 15;260:1023-31. doi: 10.1016/j.jhazmat.2013.06.051. Epub 2013 Jun 28.
Water contamination by boron is a widespread environmental problem. The World Health Organization (WHO) recommends maximum boron concentration of 2.4 mg L(-1) for drinking water. The paper presents a simple method for preparation of functionalized sheet sorbent for selective extraction of boron from natural water. The pores of commercially available poly(propylene) membrane were functionalized by room temperature in situ crosslinking of poly(vinylbenzyl chloride) with a cyclic diamine piperazine. The precursor membranes were chemically modified with N-methyl D-glucamine which is selective for boron. Characterization of membrane was carried out using scanning electron microscopy (SEM) and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) techniques. The functionalized membrane has been characterized in terms of parameters that influence the sorption of boron from aqueous streams like pH, uptake capacity, contact time, effects of competing ions and reusability. The maximum boron sorption capacity determined experimentally was 28 mg g(-1). The studies showed that trace concentrations of boron were quantitatively removed from water at neutral pH. The developed fixed site polymer sorbent exhibited high sorption capacity and fast kinetics as compared to various sorbents reported in literature. It was successfully applied for the removal of boron from ground water and seawater samples in presence of high concentration of interfering ions.
硼污染是一个广泛存在的环境问题。世界卫生组织（WHO）建议饮用水中硼的最大浓度为 2.4mg/L(-1)。本文提出了一种从天然水中选择性萃取硼的功能化片状吸附剂的简单制备方法。通过在室温下用环状二胺哌嗪对市售的聚（丙烯）膜进行原位交联，对商用聚（氯乙烯）膜的孔进行功能化。用对硼具有选择性的 N-甲基 D-葡糖胺对前体膜进行化学改性。采用扫描电子显微镜（SEM）和衰减全反射傅里叶变换红外光谱（ATR-FTIR）技术对膜进行了表征。从影响水溶液中硼吸附的参数（如 pH 值、吸附容量、接触时间、竞争离子的影响和可重复使用性）方面对功能化膜进行了表征。实验确定的最大硼吸附容量为 28mg/g(-1)。研究表明，在中性 pH 值条件下，痕量硼可被定量去除。与文献中报道的各种吸附剂相比，开发的固定位聚合物吸附剂表现出高吸附容量和快速动力学。它已成功应用于去除高浓度干扰离子存在下的地下水和海水样品中的硼。
