School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China.
Water Res. 2020 Oct 15;185:116246. doi: 10.1016/j.watres.2020.116246. Epub 2020 Jul 27.
In this study, peroxymonosulfate (PMS) activation of FeAl layered double hydroxide (FeAl-LDH) was enhanced by compounding dissolved organic matter (DOM). The characterization and catalytic performance of FeAl-LDH and DOM-LDH were investigated. The results revealed that the physicochemical properties of DOM-LDH were superior to FeAl-LDH: (i) The higher proportion of Fe(II) was found in DOM-LDH, mainly existed in the form of trans-coordinated octahedral Fe(II); (ii) DOM-LDH showed a flower-like morphology with larger specific surface area, pore width and pore volume; (iii) More functional groups and surface oxygen vacancies were found in DOM-LDH. Moreover, DOM promoted the process of PMS activation by accelerating Fe(III) reduction with humic acid-like compounds. The results of electron paramagnetic resonance (EPR) and quenching experiments indicated that more reactive oxygen species (ROS) were generated in DOM-LDH/PMS system, •OH was considered as the dominant ROS for Bisphenol A (BPA) degradation. As a result, the degradation efficiency for BPA (20 mg L) in FeAl-LDH/PMS system was increased from 60% to 93% within 60 min after the introduction of DOM. This work is expected to facilitate the design and application of Fe(II)/PMS system for environmental protection.
在这项研究中，通过复合溶解有机物（DOM）来增强过一硫酸盐（PMS）对铁铝层状双氢氧化物（FeAl-LDH）的活化作用。研究了 FeAl-LDH 和 DOM-LDH 的特性和催化性能。结果表明，DOM-LDH 的物理化学性质优于 FeAl-LDH：（i）DOM-LDH 中发现 Fe(II)的比例更高，主要以反式配位八面体 Fe(II)的形式存在；（ii）DOM-LDH 呈花状形态，具有更大的比表面积、孔径和孔体积；（iii）DOM-LDH 中存在更多的官能团和表面氧空位。此外，DOM 通过加速富里酸类化合物对 Fe(III)的还原来促进 PMS 的活化过程。电子顺磁共振（EPR）和猝灭实验的结果表明，在 DOM-LDH/PMS 体系中生成了更多的活性氧物种（ROS），•OH 被认为是 BPA 降解的主要 ROS。结果，在引入 DOM 后 60 分钟内，FeAl-LDH/PMS 体系中 BPA（20 mg L）的降解效率从 60%提高到 93%。这项工作有望促进 Fe(II)/PMS 体系在环境保护中的设计和应用。
