4.7 Article

Insight into the synergetic effect of photocatalysis and transition metal on sulfite activation: Different mechanisms for carbamazepine and diclofenac degradation

期刊

SCIENCE OF THE TOTAL ENVIRONMENT
卷 787, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.scitotenv.2021.147626

关键词

Synergetic effect; Ultra-small Fe2O3; G-C3N4; Photosensitization-like mechanism; DFT calculation

资金

  1. National Natural Science Foundation of China [51908082, 41907107]
  2. Fundamental Research Funds for the Central Universities [2020CDJYGHS002]
  3. Large Instruments Open Foundation of Chongqing University [202003150090, 202003150089]
  4. National Key Research and Development Program of China [2016YFC0402505]

向作者/读者索取更多资源

The study reveals that transition metal and photocatalysis have a synergistic effect on S(IV) activation, but the effect is target-specific. The mechanism of degradation varies for different target substances, with differences in the impact of pH and coexisting anions.
Sulfite [S(IV)] is a promising alternative for sulfate radical-based advanced oxidation processes (SR-AOPs). Transition metal and photocatalysis are generally considered to have a synergetic effect for S(IV) activation. However, the study shows that the synergetic effect is target specific. Herein, an ultra-small Fe2O3 clusters deposited graphitic carbon nitride is synthesized and used for S(IV) activation. For carbamazepine (CBZ) degradation, photogenerated holes can transform S(IV) into sulfate radical and photogenerated electrons can accelerate Fe(II)/Fe(III) cycle, which account for the synergetic effect. In contrast, the degradation of diclofenac (DCF) depends on the excitation of DCF rather than photocatalyst. Instead of radical precursor, S(IV) acts as the electron transfer bridge between excited DCF and photocatalyst. Thus, the deposition of Fe2O3 negatively affects DCF degradation. Density Functional Theory calculation shows that the first excited state rather than the ground state of diclofenac is more suitable for reactive site prediction, which confirms the photosensitization-like degradation mechanism. Moreover, the effects of pH and coexisted anions varies for CBZ and DCF. The study shed light on the synergetic effect of transition metal and photocatalysis for S(IV) activation, and also open an avenue for the study of target specific mechanisms for AOPs. (C) 2021 Elsevier B.V. All rights reserved.

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。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据