Impact of the reductive deiodination on the sorption of iodinated X-ray contrast media to filter sand and activated carbon,Water Research

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Impact of the reductive deiodination on the sorption of iodinated X-ray contrast media to filter sand and activated carbon
Water Research ( IF 11.4 ) Pub Date : 2024-05-19 , DOI: 10.1016/j.watres.2024.121801
Yuki Bartels ₁ , Martin Jekel ₁ , Anke Putschew ₁

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Iodinated X-ray contrast media (ICM) and their aerobic transformation products (TPs) are widespread in the aquatic environment due to their persistent and mobile character. In a previous lab study, we have shown that the reductive (partial) deiodination of selected triiodobenzene derivatives increases the sorption to aquifer sand and loam soil, since iodine affects the compounds by steric hindrance, repulsive forces, resonance and inductive effects. These results suggest that the (partial) deiodination generally occurring to ICM and aerobic ICM TPs during anoxic/anaerobic bank filtration has a potential to increase their removal by sorption to natural sorbents. To basically assess the sorption potential to technically applied materials for drinking water treatment subsequent to bank filtration, we investigated the sorption of iopromide, diatrizoate and 5-amino-2,4,6-triiodoisophtalic acid and their di, mono and deiodinated structures to used filter sand from a waterworks and different fresh powdered activated carbons in batch tests using Berlin drinking water. The filter material, coated by iron and manganese oxides as well as organic material (including biofilm), preferentially removed monoiodinated derivatives, but diffusion through the organic layer heavily slowed the sorption. Therefore, the removal potential by sorption in rapid sand filters of waterworks for (partially) deiodinated benzene derivatives is suggested to be low. The deiodination of iopromide and diatrizoate significantly increased the sorption affinity to activated carbon and the competitiveness with regard to drinking water DOC. Despite the large atom radius of iodine, no clear correlation was found between the pore characteristics of the activated carbons and the molecular size of the compounds. This study emphasises the importance of anoxic/anaerobic conditions for the removal of persistent and mobile ICM and ICM TPs during drinking water treatment.

中文翻译：

还原脱碘对滤砂和活性炭吸附碘 X 射线造影剂的影响

碘化 X 射线造影剂 (ICM) 及其有氧转化产物 (TP) 由于其持久性和移动性而广泛存在于水生环境中。在之前的实验室研究中，我们表明，选定的三碘苯衍生物的还原（部分）脱碘增加了对含水层沙和壤土的吸附，因为碘通过空间位阻、排斥力、共振和感应效应影响化合物。这些结果表明，在缺氧/厌氧池过滤过程中，ICM 和需氧 ICM TP 通常发生（部分）脱碘，有可能通过天然吸附剂的吸附来增加其去除率。为了基本评估银行过滤后用于饮用水处理的技术应用材料的吸附潜力，我们研究了碘普罗胺、泛影酸盐和 5-氨基-2,4,6-三碘间苯二甲酸及其二、单和脱碘结构的吸附，以用于使用使用柏林饮用水进行批量测试，过滤自来水厂的沙子和不同的新鲜粉状活性炭。涂有铁和锰氧化物以及有机材料（包括生物膜）的过滤材料优先去除单碘化衍生物，但通过有机层的扩散严重减慢了吸附。因此，水厂快速砂滤器对（部分）脱碘苯衍生物的吸附去除潜力较低。碘普罗胺和泛影酸盐的脱碘显着增加了活性炭的吸附亲和力以及饮用水 DOC 的竞争力。尽管碘的原子半径很大，但活性炭的孔隙特征和化合物的分子尺寸之间没有发现明显的相关性。本研究强调了缺氧/厌氧条件对于在饮用水处理过程中去除持久性和移动性 ICM 和 ICM TP 的重要性。

更新日期：2024-05-19

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