期刊
CATALYSIS TODAY
卷 313, 期 -, 页码 155-160出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2017.12.004
关键词
Sulfate radical; Sulfite ion; Cobalt ion; Advanced oxidation processes; Paracetamol
资金
- National Natural Science Foundation of China [21711530144, 270437]
- Federation des Recherches en Environnement through the CPER Environnement
- French government
- FEDER from European community
- China Scholarship Council at the University Clermont Auvergne in Clermont-Ferrand, France
In this study we have investigated the efficiency Cobalt (II) (Co(II)) for the activation of sulfite ions following the oxidation of paracetamol used as model contaminants. Physico-chemical parameters that can impact the paracetamol degradation (pH, initial paracetamol concentration, Co(II)/S(IV) molar ratio, oxygen concentration) and contribution of various radicals were investigated in order to elucidate the chemical mechanism. Main results show that the pH is a key factor controlling the efficiency in the system Co(II)/Sulfite. Higher efficiency is observed for pH between 9.0 and 10.0. Increasing S(IV) concentrations, until 1 mM, slightly promoted the degradation of paracetamol. In fact, an excess of sulfite ions inhibits the reaction through the scavenging of SO4 center dot- and SO5 center dot-.Moreover, degradation efficiency drastically decreases from similar to 85% to less than 5% in absence of oxygen. SO4 center dot- was confirmed to be the main oxidant responsible for the paracetamol degradation. For the first time we determined the second order rate constant between SO4 center dot- and paracetamol (1.33 +/- 0.79x10(9)M(-1) s(-1) (at pH 5) and 6.14 +/- 0.99x10(8)M(-1) s(-1) (at pH 11.0)). Moreover, radical scavenging experiments also suggest the possible implication of SO5 center dot-. Hence, this work provides a precise understanding of the overall mechanism and a new promising strategy by using sulfite and transition metal such as Co(II) to promote organic compounds degradation in water under neutral and alkaline pH conditions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据