期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 403, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123554
关键词
MgMn-layered double hydroxide; Heavy metals; Heterogeneous catalysis; Antibiotic; Synergistic effect
资金
- National Key Research and Development Program of China [2017YFD0801004]
- National Natural Science Foundation of China [41972037, 41673092]
- Basic and Applied Basic Research Foundation of Guangdong Province [2019B1515120015]
- Guangdong Science and Technology Program [2020B121201003]
- Guangdong Special Support Program for Local Innovative and Research Teams Project [2019BT02L218]
- Guangdong Special Support Program for Millions of Leading Engineering Talents [201626011]
This study found that MgMnLDH has excellent remediation functionality for heavy metals-antibiotics pollution, efficiently immobilizing Co2+ and Cu2+ and enhancing SMX degradation. MgMnLDH-Co-4 exhibited superior degradation performance due to intense Co/Mn synergism and abundant oxygen vacancies accelerating electron transfer.
In this study, MgMn-layered double hydroxide (MgMnLDH) exhibited excellent remediation functionality for heavy metals-antibiotics combined pollution. On the one hand, Co2+ and Cu2+ was efficiently immobilized on MgMnLDH with maximum quantity of 4.30 and 10.65 mmol g(-1), respectively. A series of characterizations reflected the changes in structure and physicochemical properties of MgMnLDH after the immobilization. Density functional theory calculations (DFT) confirmed that the binding modes were lattice substitution for Co2+ and surface precipitation for Cu2+. On the other hand, the immobilized heavy metals enhanced the heterogeneous degradation for sulfamethoxazole (SMX) by peroxymonosulfate (PMS) activation. Complete degradation was achieved within 10 min in MgMnLDH-Co-4/PMS system and 60 min in MgMnLDH-Cu/PMS system, while only 20% in MgMnLDH/PMS system. The pH adaptability, reusability, stability and activation mechanism of two systems were systematically compared. The superior degradation performance of MgMnLDH-Co-4 benefited from the intense Co/Mn synergism and abundant oxygen vacancies, which could accelerate electron transfer during PMS activation process. The applicability of two catalysis system was confirmed in purifying other antibiotics and actual wastewater. The results highlight the importance of structural control in heterogeneous catalysis and provide new idea for environmental remediation.
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