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Comparative investigation of X-ray contrast medium degradation by UV/chlorine and UV/H2O2
Chemosphere ( IF 8.8 ) Pub Date : 2017-11-15 , DOI: 10.1016/j.chemosphere.2017.11.064
Xiujuan Kong , Jin Jiang , Jun Ma , Yi Yang , Suyan Pang

The degradation of iopamidol and diatrizoate sodium (DTZ) by UV/chlorine was carried out according to efficiency, mechanism, and oxidation products, and compared to that by UV/H2O2. The pseudo-first order rate (k′) of iopamidol and DTZ was accelerated by UV/chlorine compared to that by UV and chlorine alone. k′ of iopamidol and DTZ by UV/chlorine increased with increasing chlorine dosage. Both of iopamidol and DTZ could not be effectively removed by UV/H2O2 compared to that by UV/chlorine. Secondary radicals (Cl2 and ClOradical dot

) rather than primary radicals (HOradical dot and Clradical dot) were demonstrated to be mainly responsible for the enhanced removal of iopamidol and DTZ by UV/chlorine. The oxidation products of iopamidol and DTZ resulting from UV/chlorine and UV/H2O2 process were identified, and differences existed in the two systems. IO3 (the desired sink of I) was the major inorganic product in the UV/chlorine process whereas I was the predominant inorganic product in the UV/H2O2 process. The formation of chlorine-containing products during the degradation of iopamidol and DTZ by UV/chlorine was also observed. H-abstraction, additions, de-iodination were shared during the degradation of iopamidol by UV/chlorine and UV/H2O2. Neutral pH condition was preferred for the removal of iopamidol and DTZ by UV/chlorine. UV/chlorine could also be applied in real waters for the removal of iopamidol and DTZ.


中文翻译:

UV /氯和UV / H 2 O 2降解X射线造影剂的比较研究

根据效率,机理和氧化产物,通过紫外线/氯进行了碘帕米醇和泛影酸钠(DTZ)的降解,并与通过UV / H 2 O 2进行了降解。与单独使用紫外线和氯相比,通过紫外线/氯加速了碘帕醇和DTZ的拟一级反应速率(k')。紫外线/氯气中碘帕醇和DTZ的k'随氯用量的增加而增加。与紫外线/氯相比,紫外线/ H 2 O 2无法有效去除碘帕醇和DTZ 。二级自由基(Cl 2-和ClO激进点

),而不是主要部首(HO激进点 和Cl激进点)被证明是造成UV /氯离子增强的Iopamidol和DTZ去除的主要原因。鉴定了由紫外线/氯和紫外线/ H 2 O 2引起的碘帕醇和DTZ的氧化产物,两种体系之间存在差异。IO 3 -(I的所需的宿- )是在UV /氯过程中的主要无机产品而我-是在UV /主要产品无机ħ 2 ö 2过程。还观察到了紫外线/氯降解碘帕醇和DTZ期间含氯产物的形成。在紫外线/氯和紫外线/ H 2 O 2降解碘帕醇的过程中,氢的吸收,添加,去碘化作用是共有的。优选中性pH条件,以通过UV /氯去除碘帕醇和DTZ。紫外线/氯气也可用于实际水中,以去除碘帕醇和DTZ。
更新日期:2017-11-15
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