Nano Fe2O3 embedded in montmorillonite with citric acid enhanced photocatalytic activity of nanoparticles towards diethyl phthalate

被引:13
作者
Sun, Zhaoyue [1 ,2 ]
Feng, Lisha [1 ,2 ]
Fang, Guodong [1 ]
Chu, Longgang [1 ,2 ]
Zhou, Dongmei [3 ]
Gao, Juan [1 ]
机构
[1] Chinese Acad Sci, Key Lab Soil Environm & Pollut Remediat, Inst Soil Sci, Nanjing 210008, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Peoples R China
来源
JOURNAL OF ENVIRONMENTAL SCIENCES | 2021年 / 101卷
基金
中国国家自然科学基金;
关键词
Heterogeneous catalyst; Hydroxyl radical; Photo-Fenton reactions; Phthalate ester; ZERO-VALENT IRON; HYDROXYL RADICALS; PILLARED MONTMORILLONITE; ABIOTIC OXIDATION; FENTON CATALYST; DEGRADATION; CLAY; REMOVAL; PHOTODEGRADATION; OXYGEN;
D O I
10.1016/j.jes.2020.08.019
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nano-Fe2O3 embedded in montmorillonite particles (Fe-Mt) were prepared to degrade diethyl phthalate (DEP) with citric acid (CA) under xenon light irradiation. Compared to pristine montmorillonite (Na-Mt), the embedding process increased 14.5-fold of iron content and 1.8-fold of specific surface area. The synthesized Fe-Mt have more oxygen vacancies than Fe2O3 nanoparticles (nFe(2)O(3)), which could induce more reactive oxygen species (ROSs) generation in the presence of CA under xenon lamp irradiation. Fe-Mt with CA enhanced photo-assisted degradation of DEP 2.5 times as compared to nFe(2)O(3) with CA. Quenching experiments, electron paramagnetic resonance (EPR) spectroscopy and identification of products confirmed that surface-bound center dot OH was the main radical to degrade DEP. Common anions (i.e., NO3-, CO32-, Cl-) and humic acid could compete center dot OH with DEP and cause slower degradation of DEP. The removal efficiency of DEP was more than 56% with Fe-Mt after three recycles, and the dissolved Fe concentration from Fe-Mt was below 75 mu mol/L, indicating Fe-Mt had a good stability as a catalyst. Fe-Mt together with CA appeared to be a promising strategy to remove organic pollutants in surface water, or topsoil under solar irradiation. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
引用
收藏
页码:248 / 259
页数:12
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