Effects of dissolved organic matter on adsorbed Fe(II) reactivity for the reduction of 2-nitrophenol in TiO2 suspensions
文献类型: 外文期刊
作者: Zhu, Zhenke 1 ; Tao, Liang 2 ; Li, Fangbai 2 ;
作者机构: 1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
关键词: Dissolved organic matter;Adsorbed Fe(II) reactivity;Cyclic voltammograms;Electron transfer capacities;2-Nitrophenol
期刊名称:CHEMOSPHERE ( 2020影响因子:7.086; 五年影响因子:6.956 )
ISSN: 0045-6535
年卷期: 2013 年 93 卷 1 期
收录情况: SCI
摘要: Dissolved organic matter (DOM) is widespread in aquatic and terrestrial environments. Iron is the most abundant transition metal in the Earth's crust. The biogeochemistry of iron and the strength of Fe(II) as a reducing agent while adsorbed on minerals are affected by DOM. This study investigated the effects of Fe(II)/DOM interactions on the reduction of 2-nitrophenol (2-NP) in TiO2 suspensions. Kinetic measurements demonstrated that rates (k) of 2-NP reduction by adsorbed Fe(II) species are affected by adding DOM (denoted O-DOM), and the obtained k values under the impact of the Fe(II)/DOM interaction with different molecular weight DOM fractions [including MW < 3500 Da (L-DOM), 3500 < MW < 14 000 Da (M-DOM), and MW > 14 000 Da (H-DOM)] showed significant differences. The enhanced rates of 2-NP reduction contributed to increases in the amount of adsorbed Fe(II) species and negative shifts in peak oxidation potential values (Er) in CV tests. For different molecular weight DOM fractions, increases in k (O-DOM < L-DOM < M-DOM < H-DOM) are consistent with increases in molar electron transfer capacities (ETC) based on k values at a fixed DOM concentration (O-DOM < L-DOM < M-DOM < H-DOM). This study attributed the impact of DOM on the enhanced reductive reactivity of Fe(II) to the higher level of adsorbed Fe(II) and the lower E-P values. In addition, the ETC values were slightly higher in the TiO2 suspension containing the H-DOM fraction as compared the other two DOM fractions, which would further enhance the reduction rate of 2-NP. These findings promote a general understanding of Fe(II)/DOM interactions and their impact on the fate of contaminants in actual subsurface environments. (C) 2013 Elsevier Ltd. All rights reserved.
- 相关文献
作者其他论文 更多>>
-
Competitive and synergistic effects of phosphate and cadmium coadsorbed on goethite
作者:Li, Hui;Tao, Liang;Chen, Wenjie;Liu, Yuxin;Yang, Feng;Tao, Liang;Liang, Junfen;Liu, Dong;Liu, Saihong
关键词:Soil acidification; Anthropic activities; Electrostatic adsorption; Ternary complex; Surface precipitation
-
Cadmium and arsenic interactions under different molar ratios during coadsorption processes by excluding pH interference
作者:Huang, Minxue;Su, Zixian;Guan, Yufeng;Tao, Liang;Huang, Minxue;Chen, Wenjie;Su, Zixian;Tao, Liang;Li, Hui;Chen, Wenjie
关键词:Coadsorption; pH interference; Electrostatic adsorption; Ternary complex; Surface precipitation
-
Comparative transcriptomics provide new insights into the mechanisms by which foliar silicon alleviates the effects of cadmium exposure in rice
作者:Sun, Chongjun;Liang, Xiaoyu;Gong, Xiaomei;Chen, Huamei;Liu, Xiulian;Zhang, Shuchang;Yi, Jicai;Li, Fangbai;Zhao, Junliang;Zhao, Junliang
关键词:Rice; Transcriptomics; Foliar silicon; Cadmium exposure
-
Comparative physiological and transcriptomic analyses illuminate common mechanisms by which silicon alleviates cadmium and arsenic toxicity in rice seedlings
作者:Chen, Huiqiong;Liang, Xiaoyu;Gong, Xiaomei;Reinfelder, John R.;Chen, Huamei;Sun, Chongjun;Liu, Xiulian;Zhang, Shuchang;Yi, Jicai;Li, Fangbai;Liu, Chuanping;Zhao, Junliang;Zhao, Junliang
关键词:Cadmium; Arsenic; Silicon; Transcriptomics; Myeloblastosis (MYB) transcription; factor; Thionin
-
Combined modification of clay with sulfhydryl and iron: Toxicity alleviation in Cr-contaminated soils for mustard (Brassica juncea) growth
作者:Liu, Chengshuai;Fei, Yingheng;Liu, Chengshuai;Li, Fangbai;Chen, Manjia;Tong, Hui;Liu, Chuanping;Liao, Changzhong
关键词:Bentonite;Chromium;Soil remediation;Thiol modification;Thiol/Fe modification
-
In situ spectral kinetics of quinone reduction by c-type cytochromes in intact Shewanella oneidensis MR-1 cells
作者:Han, Rui;Li, Xiaomin;Wu, Yundang;Li, Fangbai;Liu, Tongxu;Han, Rui
关键词:c-type cytochrome;Quinone reduction;Living cell suspension;Shewanella oneidensis MR-1
-
Effects of Incubation Conditions on Cr(VI) Reduction by c-type Cytochromes in Intact Shewanella oneidensis MR-1 Cells
作者:Han, Rui;Han, Rui;Li, Fangbai;Liu, Tongxu;Li, Xiaomin;Wu, Yundang;Wang, Ying;Chen, Dandan
关键词:c-type cytochromes;Shewanella oneidensis MR-1;Cr(VI) reduction;intact cells;incubation conditions