Department of Biotechnology, Lund University, Lund, Sweden.
J Sep Sci. 2010 Jun;33(12):1752-9. doi: 10.1002/jssc.201000019.
Bromate, which is a potential carcinogen, should be removed from drinking water to levels of less than 10 microg/L. A chitosan-based molecularly imprinted polymer (MIP) and a sol-gel ion-exchange double hydrous oxide (Fe(2)O(3) x Al(2)O(3) x xH(2)O) adsorbent (inorganic adsorbent) were prepared for this purpose. The sorption behavior of each adsorbent including sorption kinetics, isotherms, effect of pH and selective sorption were investigated in detail. Sorption experimental results showed that the MIP adsorbents had better selectivity for bromate, even in the presence of high concentrations of nitrate, as compared to the inorganic adsorbent. It was found that pH does not affect the adsorption of bromate when using the inorganic adsorbent. Additionally, both adsorbents were immobilized in a polymeric cryogel inside plastic carriers to make them more practical for using in larger scale. Regeneration of the cryogels either containing MIP or inorganic adsorbents were carried out by 0.1 M NaOH and 0.1 M NaCl, respectively. It was found that the regenerated MIP and inorganic adsorbents could be used at least three and five times, respectively, without any loss in their sorption capacity.
溴酸盐是一种潜在的致癌物质，应将其从饮用水中去除至低于 10μg/L 的水平。为此，制备了一种基于壳聚糖的分子印迹聚合物（MIP）和溶胶-凝胶离子交换双水合氧化物（Fe(2)O(3) x Al(2)O(3) x xH(2)O）吸附剂（无机吸附剂）。详细研究了每种吸附剂的吸附行为，包括吸附动力学、等温线、pH 值的影响和选择性吸附。吸附实验结果表明，与无机吸附剂相比，MIP 吸附剂对溴酸盐具有更好的选择性，即使在存在高浓度硝酸盐的情况下也是如此。研究发现，当使用无机吸附剂时，pH 值不会影响溴酸盐的吸附。此外，将两种吸附剂都固定在聚合物冷冻凝胶中，并用塑料载体固定，以便更实际地在更大规模上使用。通过 0.1 M NaOH 和 0.1 M NaCl 分别对含有 MIP 或无机吸附剂的冷冻凝胶进行再生。研究发现，再生的 MIP 和无机吸附剂可以分别使用至少三次和五次，而不会损失其吸附能力。
