Zúñiga-Benítez Henry, Peñuela Gustavo A
Grupo GDCON, Facultad de Ingeniería, Sede de Investigación Universitaria (SIU), Universidad de Antioquia, Calle 70 No 52-21, Medellín, Colombia.
Environ Sci Pollut Res Int. 2017 Mar;24(7):6022-6030. doi: 10.1007/s11356-016-6468-9. Epub 2016 Mar 18.
Methylparaben (MePB) is an organic compound employed mainly in the manufacture of different personal care products. However, it has been recently listed as a potential endocrine disrupter chemical. Therefore, the main objective of this work was to evaluate the degradation of MePB in aqueous solutions using heterogeneous photocatalysis with TiO and hydrogen peroxide. In this way, effects of pH and the initial concentrations of catalyst, HO, and pollutant on treatment were analyzed. A face centered, central composite design was used for determination of the influence of each parameter in the process and the conditions under which the pollutant suffers the highest rates of degradation were selected. In general, results indicate that combination TiO/HO/light irradiation leads to ∼90 % of substrate removal after 30 min of reaction and that hydroxyl free radicals are the main specie responsible for organic matter elimination. Finally, in terms of mineralization and biodegradability, experimental results indicated that part of the organic matter was transformed into CO and water and the photo-treatment promoted an increase in samples biodegradability.
对羟基苯甲酸甲酯（MePB）是一种主要用于制造各种个人护理产品的有机化合物。然而，它最近被列为一种潜在的内分泌干扰化学物质。因此，这项工作的主要目的是评估使用TiO和过氧化氢的非均相光催化作用对水溶液中MePB的降解情况。通过这种方式，分析了pH值以及催化剂、H₂O₂和污染物的初始浓度对处理效果的影响。采用中心复合设计的面心设计来确定过程中每个参数的影响，并选择污染物降解率最高的条件。总体而言，结果表明，TiO/H₂O₂/光照射的组合在反应30分钟后可使约90%的底物被去除，并且羟基自由基是负责去除有机物的主要物质。最后，就矿化和生物降解性而言，实验结果表明部分有机物转化为CO₂和水，并且光处理促进了样品生物降解性的提高。
