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1. Phenanthrene sorption/desorption sequences provide new insight to explain high sorption coefficients in field studies

Author:
Zhang, Di,   et al.   ; Pan, Bo; Tao, Shu; Wu, Di; Peng, Hongbo; Xing, Baoshan;     Show all 6 Authors
Source:
Chemosphere 2011 v.84 no.11 pp. 1578-1583
ISSN:
0045-6535
Subject:
desorption; hysteresis; phenanthrene
Abstract:
... The sorption coefficients obtained in field investigation vary greatly from laboratory sorption experiments. The possible reasons were discussed in literature. Observing the commonly reported desorption hysteresis, this study proposed that the unclear sorption history of the field study could also result in the diverse sorption coefficients. This study conducted a comparative study regarding phena ...
DOI:
10.1016/j.chemosphere.2011.05.051
PubMed:
21689839

2. Sorption comparison between phenanthrene and its degradation intermediates, 9,10-phenanthrenequinone and 9-phenanthrol in soils/sediments

Author:
Zhang, Di,   et al.   ; Xiao, Di; Pan, Bo; Wu, Min; Liu, Ying; Peng, Hongbo;     Show all 6 Authors
Source:
Chemosphere 2012 v.86 no.2 pp. 183-189
ISSN:
0045-6535
Subject:
carbon; environmental fate; phenanthrene; physicochemical properties; risk; risk assessment; sediments; soil; sorption; surface area
Abstract:
... The degradation intermediates of phenanthrene (PHE) may have increased health risks to organisms than PHE. Therefore, environmental fate and risk assessment studies should take into considerations of PHE degradation products. This study compared the sorption properties of PHE and its degradation intermediates, 9,10-phenanthrenequinone (PQN) and 9-phenanthrol (PTR) in soils, sediments and soil comp ...
DOI:
10.1016/j.chemosphere.2011.10.010
PubMed:
22055310

3. The sorption of organic contaminants on biochars derived from sediments with high organic carbon content

Author:
Zhang, Di,   et al.   ; Wu, Min; Pan, Bo; Xiao, Di; Li, Hao; Wang, Chi; Ning, Ping;     Show all 7 Authors
Source:
Chemosphere 2013 v.90 pp. 782-788
ISSN:
0045-6535
Subject:
sediments; sulfamethoxazole; bisphenol A; energy; lakes; phenanthrenes; sorption; soil; biochar; carbon; adsorbents; electrostatic interactions; norfloxacin; pyrolysis; sorption isotherms; temperature; ofloxacin
Abstract:
... Biochars were produced using a Dianchi Lake sediment at different temperatures and their sorption characteristics with five organic contaminants (with solubilities varied three orders of magnitude) were compared. Freundlich model showed satisfying fitting results of the sorption isotherms. Distinct decrease of nonlinear factors was observed for all five contaminants with pyrolysis suggesting wider ...
DOI:
10.1016/j.chemosphere.2012.09.075
PubMed:
23089389

4. Physiological and biochemical responses of rice seeds to phosphine exposure during germination

Author:
Zhang, Di,   et al.   ; Niu, Xiaojun; Mi, Lina; Li, Yadong; Wei, Aishu; Yang, Zhiquan; Wu, Jiandong; Song, Xiaofei;     Show all 8 Authors
Source:
Chemosphere 2013 v.93 pp. 2239-2244
ISSN:
0045-6535
Subject:
antioxidant activity; antioxidants; catalase; insects; lipid peroxidation; malondialdehyde; mammals; oxidative stress; peroxidase; phosphine; rice; seed germination; seeds; superoxide dismutase
Abstract:
... Rice seeds (Tianyou, 3618) were used to examine the physiological and biochemical responses to phosphine exposure during germination. A control (0mgm−3) and four concentrations of phosphine (1.4mgm−3, 4.2mgm−3, 7.0mgm−3 and 13.9mgm−3) were used to treat the rice seeds. Each treatment was applied for 90min once per day for five days. The germination rate (GR); germination potential (GP); germinatio ...
DOI:
10.1016/j.chemosphere.2013.07.074
PubMed:
23992639

5. Adsorption of antibiotic ciprofloxacin on carbon nanotubes: pH dependence and thermodynamics

Author:
Zhang, Di,   et al.   ; Li, Haibo; Han, Xiaozeng; Xing, Baoshan;     Show all 4 Authors
Source:
Chemosphere 2014 v.95 pp. 150-155
ISSN:
0045-6535
Subject:
adsorbents; adsorption; antibiotics; carbon nanotubes; ciprofloxacin; desorption; energy; entropy; environmental factors; hysteresis; models; pH; risk; sorption isotherms; surface area; temperature
Abstract:
... The environmental risks of antibiotics have attracted increasing research attention, but their environmental behaviors remain unclear. In this study, functionalized carbon nanotubes (CNTs), namely, hydroxylized (MH), carboxylized (MC), graphitized multi-walled CNTs (MG) and single-walled CNTs (SW) were used as adsorbents and ciprofloxacin (CIP) as an adsorbate to investigate the effect of pH and t ...
DOI:
10.1016/j.chemosphere.2013.08.053

6. Characterization and spacial distribution variability of chromophoric dissolved organic matter (CDOM) in the Yangtze Estuary

Author:
Zhang, Di,   et al.   ; Wang, Ying; Shen, Zhenyao; Chen, Jing; Feng, Chenghong;     Show all 5 Authors
Source:
Chemosphere 2014 v.95 pp. 353-362
ISSN:
0045-6535
Subject:
anthropogenic activities; coasts; dissolved organic matter; estuaries; fluorescence; humification; models; principal component analysis; rivers; sediments; wastes; Yangtze River
Abstract:
... The spatial characteristics and the quantity and quality of the chromophoric dissolved organic matter (CDOM) in the Yangtze Estuary, based on the abundance, degree of humification and sources, were studied using 3D fluorescence excitation emission matrix spectra (F-EEMs) with parallel factor and principal component analysis (PARAFAC–PCA). The results indicated that the CDOM abundance decreased and ...
DOI:
10.1016/j.chemosphere.2013.09.044

7. Sorption and solubility of ofloxacin and norfloxacin in water–methanol cosolvent

Author:
Zhang, Di,   et al.   ; Peng, Hongbo; Li, Hao; Wang, Chi; Pan, Bo; Xing, Baoshan;     Show all 6 Authors
Source:
Chemosphere 2014 v.103 pp. 322-328
ISSN:
0045-6535
Subject:
antibiotics; carbon nanotubes; hydrogen bonding; methanol; models; norfloxacin; ofloxacin; pollution control; prediction; risk assessment; solubility; solutes; solvents; sorption
Abstract:
... Prediction of the properties and behavior of antibiotics is important for their risk assessment and pollution control. Theoretical calculation was incorporated in our experimental study to investigate the sorption of ofloxacin (OFL) and norfloxacin (NOR) on carbon nanotubes and their solubilities in water, methanol, and their mixture. Sorption for OFL and NOR decreased as methanol volume fractions ...
DOI:
10.1016/j.chemosphere.2013.12.025

8. Sorption of perfluorooctanoic acid, perfluorooctane sulfonate and perfluoroheptanoic acid on granular activated carbon

Author:
Zhang, Di,   et al.   ; Luo, Qi; Gao, Bin; Chiang, Sheau-Yun Dora; Woodward, David; Huang, Qingguo;     Show all 6 Authors
Source:
Chemosphere 2016 v.144 pp. 2336-2342
ISSN:
0045-6535
Subject:
Fourier transform infrared spectroscopy; acids; activated carbon; halogenated hydrocarbons; hydrophobicity; ketones; models; perfluorocarbons; sorption; sorption isotherms; sulfides
Abstract:
... The sorption of perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), and perfluoroheptanoic acid (PFHpA) on granular activated carbon (GAC) was characterized and compared to explore the underlying mechanisms. Sorption of the three perfluoroalkyl acids (PFAAs) on GAC appeared to be a rapid intra-particle diffusion process, which were well represented by the pseudo-second-order rate mode ...
DOI:
10.1016/j.chemosphere.2015.10.124

9. Transformation, products, and pathways of chlorophenols via electro-enzymatic catalysis: How to control toxic intermediate products

Author:
Zhang, Di,   et al.   ; Du, Penghui; Zhao, He; Li, Haitao; Huang, Ching-Hua; Deng, Manfeng; Liu, Chenming; Cao, Hongbin;     Show all 8 Authors
Source:
Chemosphere 2016 v.144 pp. 1674-1681
ISSN:
0045-6535
Subject:
2,4-dichlorophenol; aqueous solutions; carbon dioxide; catalytic activity; hydrogen peroxide; hydroxylation; mass spectrometry; oxidation; pH; peroxidase; pollutants; polymerization; polymers; risk; toxicity; urinary bladder neoplasms; wastewater
Abstract:
... Chlorophenols can be easily oxidized into chlorobenzoquinones (CBQs), which are highly toxic and have been linked to bladder cancer risk. Herein, we report the transformation, products, and pathways of 2,4-dichlorophenol (DCP) by horseradish peroxidase (HRP) and electro-generated hydrogen peroxide (H2O2) and suggest methods to control the formation of toxic intermediate products. After a 10-min el ...
DOI:
10.1016/j.chemosphere.2015.10.038

10. Adsorption mechanism of different organic chemicals on fluorinated carbon nanotubes

Author:
Zhang, Di,   et al.   ; Li, Hao; Zheng, Nan; Liang, Ni; Wu, Min; Pan, Bo;     Show all 6 Authors
Source:
Chemosphere 2016 v.154 pp. 258-265
ISSN:
0045-6535
Subject:
adsorption; bisphenol A; butterflies; carbon; carbon nanotubes; coatings; desorption; electrostatic interactions; heat production; hysteresis; norfloxacin; ofloxacin; phenanthrene; polytetrafluoroethylene; scanning electron microscopy; sulfamethoxazole; surface area; transmission electron microscopy
Abstract:
... Multi-walled carbon nanotubes (MC) were fluorinated by a solid-phase reaction method using polytetrafluoroethylene (PTFE). The surface alteration of carbon nanotubes after fluorination (MC-F) was confirmed based on surface elemental analysis, TEM and SEM. The incorporation of F on MC surface was discussed as F incorporation on carbon defects, replacement of carboxyl groups, as well as surface coat ...
DOI:
10.1016/j.chemosphere.2016.03.099

11. Impact of concentration and species of sulfamethoxazole and ofloxacin on their adsorption kinetics on sediments

Author:
Zhang, Di,   et al.   ; Wang, Peng; Zhang, Huang; Li, Hao; Ghosh, Saikat; Pan, Bo;     Show all 6 Authors
Source:
Chemosphere 2017
ISSN:
0045-6535
Subject:
adsorption; antibiotics; electrostatic interactions; humans; hydrophobic bonding; neutralization; ofloxacin; pH; sediments; sulfamethoxazole; veterinary medicine
Abstract:
... Antibiotics are used widely in human and veterinary medicine and are ubiquitous in environmental matrices worldwide. The influence of the concentration of antibiotics on adsorption kinetics is still unclear. This study used sulfamethoxazole (SMX) and ofloxacin (OFL) as adsorbates to investigate the adsorption kinetics on sediment affected by varying concentrations of antibiotics adsorbable species ...
DOI:
10.1016/j.chemosphere.2017.02.038

12. Contribution of hydrophobic effect to the sorption of phenanthrene, 9-phenanthrol and 9, 10-phenanthrenequinone on carbon nanotubes

Author:
Zhang, Di,   et al.   ; Peng, Hongbo; Pan, Bo; Peng, Jinhui;     Show all 4 Authors
Source:
Chemosphere 2017 v.168 pp. 739-747
ISSN:
0045-6535
Subject:
acute toxicity; adsorbents; adsorption; carbon nanotubes; chemical composition; hexadecane; hydrogen bonding; hydrophobicity; methanol; models; oxygen; phenanthrene; polar compounds; pollutants; polycyclic aromatic hydrocarbons; screening; solvents; sorption isotherms; surface area
Abstract:
... Polycyclic aromatic hydrocarbons (PAHs), with diverse sources and acute toxicity, are categorized as priority pollutants. Previous studies have stated that the hydrophobic effect controls PAH sorption, but no study has been conducted to quantify the exact contribution of the hydrophobic effect. Considering the well-defined structure of carbon nanotubes and their stable chemical composition in orga ...
DOI:
10.1016/j.chemosphere.2016.10.143

13. Trace determination and occurrence of eight chlorophenylacetonitriles: An emerging class of aromatic nitrogenous disinfection byproducts in drinking water

Author:
Zhang, Di,   et al.   ; Bond, Tom; Krasner, Stuart W.; Chu, Wenhai; Pan, Yang; Xu, Bin; Yin, Daqiang;     Show all 7 Authors
Source:
Chemosphere 2019 v.220 pp. 858-865
ISSN:
0045-6535
Subject:
byproducts; cytotoxicity; detection limit; disinfection; drinking water; gas chromatography-mass spectrometry; isomers; liquids; pH; solid phase extraction; water pollution
Abstract:
... Two chlorophenylacetonitriles (CPANs) (2-chloro- and 3,4-dichlorophenylacetonitrile), representatives of an emerging class of aromatic nitrogenous disinfection byproducts, were recently identified in chlor(am)inated drinking water with liquid/liquid extraction and gas chromatography/mass spectrometry (GC/MS). Due to their high cytotoxicity, they are potentially significant drinking water contamina ...
DOI:
10.1016/j.chemosphere.2018.12.127