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Zindler F, Glomstad B, Altin D, Liu J, Jenssen BM, Booth AM. Phenanthrene Bioavailability and Toxicity to Daphnia magna in the Presence of Carbon Nanotubes with Different Physicochemical Properties. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:12446-12454. [PMID: 27700057 DOI: 10.1021/acs.est.6b03228] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Studies investigating the effect of carbon nanotubes (CNTs) on the bioavailability and toxicity of hydrophobic organic compounds in aquatic environments have generated contradictory results, and the influence of different CNT properties remains unknown. Here, the adsorption of the polycyclic aromatic hydrocarbon phenanthrene (70-735 μg/L) to five types of CNTs exhibiting different physical and chemical properties was studied. The CNTs were dispersed in the presence of natural organic matter (nominally 20 mg/L) in order to increase the environmental relevance of the study. Furthermore, the bioavailability and toxicity of phenanthrene to Daphnia magna in the absence and presence of dispersed CNTs was investigated. Both CNT dispersion and adsorption of phenanthrene appeared to be influenced by CNT physical properties (diameter and specific surface area). However, dispersion and phenanthrene adsorption was not influenced by CNT surface chemical properties (surface oxygen content), under the conditions tested. Based on nominal phenanthrene concentrations, a reduction in toxicity to D. magna was observed during coexposure to phenanthrene and two types of CNTs, while for the others, no influence on phenanthrene toxicity was observed. Based on freely dissolved concentrations, however, an increased toxicity was observed in the presence of all CNTs, indicating bioavailability of CNT-adsorbed phenanthrene to D. magna.
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Affiliation(s)
- Florian Zindler
- Department of Biology, Norwegian University of Science and Technology , Trondheim NO-7491, Norway
| | - Berit Glomstad
- Department of Biology, Norwegian University of Science and Technology , Trondheim NO-7491, Norway
| | | | - Jingfu Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China
| | - Bjørn M Jenssen
- Department of Biology, Norwegian University of Science and Technology , Trondheim NO-7491, Norway
| | - Andy M Booth
- SINTEF Materials and Chemistry, Trondheim NO-7465, Norway
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52
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Ling C, Li X, Zhang Z, Liu F, Deng Y, Zhang X, Li A, He L, Xing B. High Adsorption of Sulfamethoxazole by an Amine-Modified Polystyrene-Divinylbenzene Resin and Its Mechanistic Insight. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10015-23. [PMID: 27574832 DOI: 10.1021/acs.est.6b02846] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Sulfamethoxazole (SMZ) adsorption by a series of amine-modified polystyrene-divinylbenzene resins (PSA/B/C/D) was investigated. All resins showed a similar pH dependent adsorption of SMZ but their capacities were linearly related with the contents of primary amines (-NH2) rather than secondary amines (-NH-). Mechanisms of SMZ adsorption by PSA (highest -NH2 content) were discussed as an example. Due to comparable pKa, H-bonding interactions of -NH2(0) with SMZ(0) (regular H-bond) and SMZ(-) (negative charge-assisted H-bond, (-)CAHB) successively contributed most adsorption (pH 4-9). At weakly acidic pH, -NH2(0) was partially protonated and electrostatic attraction between -NH3(+) and SMZ(-) occurred concurrently, but could be hindered by increased loading of SMZ(0). Hydrophobic/ π-π interactions were not major mechanisms as phenanthrene and nitrobenzenes had little effect on SMZ adsorption. At alkaline pH, where SMZ(-) and -NH2(0) prevailed, adsorption was accompanied by the stoichiometric (∼1.0) proton exchange with water, leading to OH(-) release and the formation of (-)CAHB [SO2N(-)···H···NH2]. The interaction and SMZ spatial distribution in the resin-phase were further confirmed by FTIR and Raman spectra. SMZ was uniformly adsorbed on external and interior surfaces. SMZ adsorption by PSA had low-interference from other coexistent matter, but high stability after multiple regenerations. The findings will guide new adsorbent designs for selectively removing target organics.
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Affiliation(s)
- Chen Ling
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing 210023, P. R. China
- Stockbridge School of Agriculture, University of Massachusetts , Amherst, Massachusetts 01003, United States
| | - Xiaoyun Li
- Stockbridge School of Agriculture, University of Massachusetts , Amherst, Massachusetts 01003, United States
- College of Tourism and Environment, Shaanxi Normal University , Xi'an, Shaanxi 710119, P. R. China
| | - Zhiyun Zhang
- Department of Food Science, University of Massachusetts , Amherst, Massachusetts 01003, United States
| | - Fuqiang Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing 210023, P. R. China
| | - Yingqing Deng
- Stockbridge School of Agriculture, University of Massachusetts , Amherst, Massachusetts 01003, United States
| | - Xiaopeng Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing 210023, P. R. China
| | - Aimin Li
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing 210023, P. R. China
| | - Lili He
- Department of Food Science, University of Massachusetts , Amherst, Massachusetts 01003, United States
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts , Amherst, Massachusetts 01003, United States
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53
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Li H, Zheng N, Liang N, Zhang D, Wu M, Pan B. Adsorption mechanism of different organic chemicals on fluorinated carbon nanotubes. CHEMOSPHERE 2016; 154:258-265. [PMID: 27058918 DOI: 10.1016/j.chemosphere.2016.03.099] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2015] [Revised: 03/12/2016] [Accepted: 03/21/2016] [Indexed: 06/05/2023]
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 coating of PTFE. The adsorption performance and mechanisms of MC-F for five kinds of representative organic compounds: sulfamethoxazole (SMX), ofloxacin (OFL), norfloxacin (NOR), bisphenol a (BPA) and phenanthrene (PHE) were investigated. Although BET-N2 surface area of the investigated CNTs decreased after fluorination, the adsorption of all five chemicals increased. Because of the glassification of MC-F surface coating during BET-N2 surface area measurement, the accessible surface area of MC-F was underestimated. Desorption hysteresis was generally observed in all the sorption systems in this study, and the desorption hysteresis of MC-F were stronger than the pristine CNTs. The enhanced adsorption of MC-F may be attributed the pores generated on the coated PTFE and the dispersed CNT aggregates due to the increased electrostatic repulsion after fluorination. The rearrangement of the bundles or diffusion of the adsorbates in MC-F inner pores were the likely reason for the strong desorption hysteresis of MC-F. The butterfly structure of BPA resulted in its high sorption and strong desorption hysteresis. The exothermic sorption character of OFL on CNTs resulted in its strong desorption hysteresis.
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Affiliation(s)
- Hao Li
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, PR China
| | - Nan Zheng
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, PR China
| | - Ni Liang
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, PR China
| | - Di Zhang
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, PR China
| | - Min Wu
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, PR China
| | - Bo Pan
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, PR China.
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Guo H, Li H, Liang N, Chen F, Liao S, Zhang D, Wu M, Pan B. Structural benefits of bisphenol S and its analogs resulting in their high sorption on carbon nanotubes and graphite. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:8976-84. [PMID: 26822215 DOI: 10.1007/s11356-016-6040-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2015] [Accepted: 01/04/2016] [Indexed: 05/20/2023]
Abstract
Bisphenol S (BPS), a new bisphenol analog, is considered to be a potential replacement for bisphenol A (BPA), which has gained concern because of its potentially adverse health impacts. Therefore, studies are needed to investigate the environmental fate and risks of this compound. In this study, the adsorption of BPS and four structural analogs on multi-walled carbon nanotubes (MWCNTs) and graphite (GP) were investigated. When solid-phase concentrations were normalized by the surface areas, oxygen-containing functional groups on the absorbents showed a positive impact on phenol sorption but inhibited the sorption of chemicals with two benzene rings. Among BPS analogs, diphenyl sulfone showed the lowest sorption when hydrophobic effects were ruled out. Chemicals with a butterfly structure, formed between the two benzene rings, showed consistently high sorption on MWCNTs, independent of the substituted electron-donating or accepting functional groups. This study emphasizes the importance of chemical conformation on organic, contaminant sorption on engineered, carbonaceous materials.
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Affiliation(s)
- Huiying Guo
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Hao Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Ni Liang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Fangyuan Chen
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Shaohua Liao
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Di Zhang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Min Wu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China.
| | - Bo Pan
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
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Yang K, Yang J, Jiang Y, Wu W, Lin D. Correlations and adsorption mechanisms of aromatic compounds on a high heat temperature treated bamboo biochar. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 210:57-64. [PMID: 26708759 DOI: 10.1016/j.envpol.2015.12.004] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 11/30/2015] [Accepted: 12/02/2015] [Indexed: 06/05/2023]
Abstract
Adsorption of aromatic compounds, including polycyclic aromatic hydrocarbons, nitrobenzenes, phenols, and anilines, on a bamboo biochar produced at 700 °C (Ba700) was investigated with the mechanism discussion by isotherm fitting using the Polanyi-theory based Dubinin-Ashtakhov (DA) model. Correlations of adsorption capacity (Q(0)) of organic compounds with their molecular sizes and melting points, as well as correlations of adsorption affinity (E) with their solvatochromic parameters (i.e., π* and αm), on the biochar, were developed and indicating that adsorption is captured by the pore filling mechanism and derived from the hydrophobic effects of organic compounds and the forming of π-π electron donor-acceptor (EDA) interactions and hydrogen bonding interactions of organic molecules with surface sites of the biochar. The effects of organic molecular sizes and melting points on adsorption capacity are ascribed to the molecular sieving effect and the packing efficiency of the organic molecules in the biochar pores, respectively. These correlations can be used to quantitatively estimate the adsorption of organic compounds on biochars from their commonly physicochemical properties including solvatochromic parameters, melting points and molecular cross-sectional area. The prediction using these correlations is important for assessing the unknown adsorption behaviors of new organic compounds and also helpful to guide the surface modification of biochars and make targeted selection in the environmental applications of biochars as adsorbents.
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Affiliation(s)
- Kun Yang
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China.
| | - Jingjing Yang
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China
| | - Yuan Jiang
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China
| | - Wenhao Wu
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China
| | - Daohui Lin
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China
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56
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Glomstad B, Altin D, Sørensen L, Liu J, Jenssen BM, Booth AM. Carbon Nanotube Properties Influence Adsorption of Phenanthrene and Subsequent Bioavailability and Toxicity to Pseudokirchneriella subcapitata. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:2660-8. [PMID: 26824708 DOI: 10.1021/acs.est.5b05177] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The bioavailability of organic contaminants adsorbed to carbon nanotubes (CNTs) remains unclear, especially in complex natural freshwaters containing natural organic matter (NOM). Here, we report on the adsorption capacity (Q(0)) of five CNTs exhibiting different physicochemical properties, including a single-walled CNT (SWCNTs), multiwalled CNTs (MWCNT-15 and MWCNT-30), and functionalized MWCNTs (hydroxyl, -OH, and carboxyl, -COOH), for the model polycyclic aromatic hydrocarbon phenanthrene (3.1-800 μg/L). The influence of phenanthrene adsorption by the CNTs on bioavailability and toxicity was investigated using the freshwater algae Pseudokirchneriella subcapitata. CNTs were dispersed in algal growth media containing NOM (DOC, 8.77 mg/L; dispersed concentrations: 0.5, 1.3, 1.3, 3.3, and 6.1 mg/L for SWCNT, MWCNT-15, MWCNT-30, MWCNT-OH, and MWCNT-COOH, respectively). Adsorption isotherms of phenanthrene to the dispersed CNTs were fitted with the Dubinin-Ashtakhov model. Q(0) differed among the CNTs, increasing with increasing surface area and decreasing with surface functionalization. SWCNT and MWCNT-COOH exhibited the highest and lowest log Q(0) (8.891 and 7.636 μg/kg, respectively). The presence of SWCNTs reduced phenanthrene toxicity to algae (EC50; 528.4) compared to phenanthrene-only (EC50; 438.3), and the presence of MWCNTs had no significant effect on phenanthrene toxicity. However, phenanthrene adsorbed to NOM-dispersed CNTs proved to be bioavailable and contribute to exert toxicity to P. subcapitata.
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Affiliation(s)
- Berit Glomstad
- Department of Biology, Norwegian University of Science and Technology , Trondheim NO-7491, Norway
| | | | | | - Jingfu Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing, 100085, China
| | - Bjørn M Jenssen
- Department of Biology, Norwegian University of Science and Technology , Trondheim NO-7491, Norway
| | - Andy M Booth
- SINTEF Materials and Chemistry , Trondheim NO-7465, Norway
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57
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Wang QL, Huang QX, Wu HF, Lu SY, Wu HL, Li XD, Yan JH. Catalytic decomposition of gaseous 1,2-dichlorobenzene over CuOx/TiO₂ and CuOx/TiO₂-CNTs catalysts: Mechanism and PCDD/Fs formation. CHEMOSPHERE 2016; 144:2343-2350. [PMID: 26606189 DOI: 10.1016/j.chemosphere.2015.10.097] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 08/17/2015] [Accepted: 10/22/2015] [Indexed: 06/05/2023]
Abstract
Gaseous 1,2-dichlorobenzene (1,2-DCBz) was catalytically decomposed in a fixed-bed catalytic reactor using composite copper-based titanium oxide (CuOx/TiO2) catalysts with different copper ratios. Carbon nanotubes (CNTs) were introduced to produce novel CuOx/TiO2-CNTs catalysts by the sol-gel method. The catalytic performances of CuOx/TiO2 and CuOx/TiO2-CNTs on 1,2-DCBz oxidative destruction under different temperatures (150-350 °C) were experimentally examined and the correlation between catalyst structure and catalytic activity was characterized and the role of oxygen in catalytic reaction was discussed. Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) generation during 1,2-DCBz catalytic oxidation by CuOx/TiO2-CNTs composite catalyst was also examined. Results indicate that the 1,2-DCBz destruction/removal efficiencies of CuOx (4 wt%)/TiO2 catalyst at 150 °C and 350 °C with a GHSV of 3400 h(-1) are 59% and 94% respectively and low-temperature (150 °C) catalytic activity of CuOx/TiO2 on 1,2-DCBz oxidation can be improved from 59 to 77% when CNTs are introduced. Furthermore, oxygen either in catalyst or from reaction atmosphere is indispensible in reaction. The former is offered to activate and oxidize the 1,2-DCBz adsorbed on catalyst, thus can be generally consumed during reaction and the oxygen content in catalyst is observed lost from 39.9 to 35.0 wt% after reacting under inert atmosphere; the latter may replenish the vacancy in catalyst created by the consumed oxygen thus extends the catalyst life and raises the destruction/removal efficiency. The introduction of CNTs also increases the Cu(2+)/Cu(+) ratio, chemisorbed oxygen concentration and surface lattice oxygen binding energy which are closely related with catalytic activity. PCDD/Fs is confirmed to be formed when 1,2-DCBz catalytically oxidized by CuOx/TiO2-CNTs composite catalyst with sufficient oxygen (21%), proper temperature (350 °C) and high concentration of 1,2-DCBz feed (120 ppm).
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Affiliation(s)
- Qiu-lin Wang
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering of Zhejiang University, Hangzhou 310027, China; School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Qun-xing Huang
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering of Zhejiang University, Hangzhou 310027, China.
| | - Hui-fan Wu
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering of Zhejiang University, Hangzhou 310027, China
| | - Sheng-yong Lu
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering of Zhejiang University, Hangzhou 310027, China
| | - Hai-long Wu
- Zhoushan Environmental Protection Bureau, Zhoushan 316000, China
| | - Xiao-dong Li
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering of Zhejiang University, Hangzhou 310027, China
| | - Jian-hua Yan
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering of Zhejiang University, Hangzhou 310027, China
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58
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Yang K, Qi L, Wei W, Wu W, Lin D. Prediction of the sorption capacities and affinities of organic chemicals by XAD-7. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:1060-1070. [PMID: 25561259 DOI: 10.1007/s11356-014-4012-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 12/15/2014] [Indexed: 06/04/2023]
Abstract
Macro-porous resins are widely used as adsorbents for the treatment of organic contaminants in wastewater and for the pre-concentration of organic solutes from water. However, the sorption mechanisms for organic contaminants on such adsorbents have not been systematically investigated so far. Therefore, in this study, the sorption capacities and affinities of 24 organic chemicals by XAD-7 were investigated and the experimentally obtained sorption isotherms were fitted to the Dubinin-Ashtakhov model. Linear positive correlations were observed between the sorption capacities and the solubilities (SW) of the chemicals in water or octanol and between the sorption affinities and the solvatochromic parameters of the chemicals, indicating that the sorption of various organic compounds by XAD-7 occurred by non-linear partitioning into XAD-7, rather than by adsorption on XAD-7 surfaces. Both specific interactions (i.e., hydrogen-bonding interactions) as well as nonspecific interactions were considered to be responsible for the non-linear partitioning. The correlation equations obtained in this study allow the prediction of non-linear partitioning using well-known chemical parameters, namely SW, octanol-water partition coefficients (KOW), and the hydrogen-bonding donor parameter (αm). The effect of pH on the sorption of ionizable organic compounds (IOCs) could also be predicted by combining the correlation equations with additional equations developed from the estimation of IOC dissociation rates. The prediction equations developed in this study and the proposed non-linear partition mechanism shed new light on the selective removal and pre-concentration of organic solutes from water and on the regeneration of exhausted XAD-7 using solvent extraction.
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Affiliation(s)
- Kun Yang
- Department of Environmental Science, Zhejiang University, 310058, Hangzhou, China.
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, 310058, Hangzhou, China.
| | - Long Qi
- Department of Environmental Science, Zhejiang University, 310058, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, 310058, Hangzhou, China
| | - Wei Wei
- Department of Environmental Science, Zhejiang University, 310058, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, 310058, Hangzhou, China
| | - Wenhao Wu
- Department of Environmental Science, Zhejiang University, 310058, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, 310058, Hangzhou, China
| | - Daohui Lin
- Department of Environmental Science, Zhejiang University, 310058, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, 310058, Hangzhou, China
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59
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Wu W, Yang K, Chen W, Wang W, Zhang J, Lin D, Xing B. Correlation and prediction of adsorption capacity and affinity of aromatic compounds on carbon nanotubes. WATER RESEARCH 2016; 88:492-501. [PMID: 26521219 DOI: 10.1016/j.watres.2015.10.037] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 09/23/2015] [Accepted: 10/18/2015] [Indexed: 06/05/2023]
Abstract
Adsorption of 22 nonpolar and polar aromatic compounds on 10 carbon nanotubes (CNTs) with various diameters, lengths and surface oxygen-containing group contents was investigated to develop predictive correlations for adsorption, using the isotherm fitting of Polanyi theory-based Dubinin-Ashtakhov (DA) model. Adsorption capacity of aromatic compounds on CNTs is negatively correlated with melting points of aromatic compounds, and surface oxygen-containing group contents and surface area ratios of mesopores to total pores of CNTs, but positively correlated with total surface area of CNTs. Adsorption affinity is positively correlated with solvatochromic parameters of aromatic compounds, independent of tube lengths and surface oxygen-containing group contents of CNTs, but negatively correlated with surface area ratios of mesopores to total pores of CNTs. The correlations of adsorption capacity and adsorption affinity with properties of both aromatic compounds and CNTs clearly have physical significance, can be used successfully with DA model to predict adsorption of aromatic compounds on CNTs from the well-known physiochemical properties of aromatic compounds (i.e., solvatochromic parameters, melting points) and CNTs (i.e., surface area and total acidic group contents), and thus can facilitate the environmental application of CNTs as sorbents and environmental risk assessment of both aromatic contaminants and CNTs.
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Affiliation(s)
- Wenhao Wu
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China; Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, USA
| | - Kun Yang
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China.
| | - Wei Chen
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China; Zhejiang Province Environmental Monitoring Centre, Hangzhou, 310015, China
| | - Wendi Wang
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China
| | - Jie Zhang
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China
| | - Daohui Lin
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, USA.
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60
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Yu X, Sun W, Ni J. LSER model for organic compounds adsorption by single-walled carbon nanotubes: Comparison with multi-walled carbon nanotubes and activated carbon. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2015; 206:652-660. [PMID: 26319510 DOI: 10.1016/j.envpol.2015.08.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2015] [Revised: 08/17/2015] [Accepted: 08/20/2015] [Indexed: 06/04/2023]
Abstract
LSER models for organic compounds adsorption by single and multi-walled carbon nanotubes and activated carbon were successfully developed. The cavity formation and dispersion interactions (vV), hydrogen bond acidity interactions (bB) and π-/n-electron interactions (eE) are the most influential adsorption mechanisms. SWCNTs is more polarizable, less polar, more hydrophobic, and has weaker hydrogen bond accepting and donating abilities than MWCNTs and AC. Compared with SWCNTs and MWCNTs, AC has much less hydrophobic and less hydrophilic adsorption sites. The regression coefficients (e, s, a, b, v) vary in different ways with increasing chemical saturation. Nonspecific interactions (represented by eE and vV) have great positive contribution to organic compounds adsorption, and follow the order of SWCNTs > MWCNTs > AC, while hydrogen bond interactions (represented by aA and bB) demonstrate negative contribution. These models will be valuable for understanding adsorption mechanisms, comparing adsorbent characteristics, and selecting the proper adsorbents for certain organic compounds.
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Affiliation(s)
- Xiangquan Yu
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Weiling Sun
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
| | - Jinren Ni
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
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61
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Ghaffar A, Ghosh S, Li F, Dong X, Zhang D, Wu M, Li H, Pan B. Effect of biochar aging on surface characteristics and adsorption behavior of dialkyl phthalates. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2015; 206:502-509. [PMID: 26281762 DOI: 10.1016/j.envpol.2015.08.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Revised: 07/29/2015] [Accepted: 08/01/2015] [Indexed: 06/04/2023]
Abstract
The implications of biochar aging regarding their material properties as well as their interactions with other contaminants are not vivid. We report the role of biochar aging on sorption behavior of di-alkyl phthalates (PAEs). Biochars used in this study were produced from peanut-shell and their aging was simulated by chemical oxidation. The structural composition and morphology of the obtained biochars, before and after oxidation with HNO3/H2SO4, were analyzed by element composition, XPS, DRIFT, and SEM/EDX. Several experimental results unequivocally showed oxygen enrichment in the mixed acid treated samples compared to their precursors. Despite surface area reduction and pore destruction, increased PAEs sorption on oxidized biochar surfaces portrayed existence of strong PAEs binding sites. The adsorption of PAEs on oxidized biochar surface is a cumulative influence of hydrophobic interactions and pi-pi electron donor-acceptor interactions. Our results suggest that imminent aging of biochar upon environmental exposure may change their sorbent properties.
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Affiliation(s)
- Abdul Ghaffar
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Saikat Ghosh
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China.
| | - Fangfang Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Xudong Dong
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Di Zhang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Min Wu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Hao Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Bo Pan
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
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Liu J, Li X, Jia W, Ding M, Zhang Y, Ren S. Separation of Emulsified Oil from Oily Wastewater by Functionalized Multiwalled Carbon Nanotubes. J DISPER SCI TECHNOL 2015. [DOI: 10.1080/01932691.2015.1090320] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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63
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Shi K, Xie Y, Qiu Y. Natural oxidation of a temperature series of biochars: opposite effect on the sorption of aromatic cationic herbicides. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2015; 114:102-108. [PMID: 25621722 DOI: 10.1016/j.ecoenv.2015.01.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 01/11/2015] [Accepted: 01/15/2015] [Indexed: 06/04/2023]
Abstract
The natural oxidation of biochar in the environment has been widely observed. However, its influence on the sorption of organic contaminants remains poorly understood. In the present study, a series of wood-based biochars prepared between 300 and 600°C (referred to as BC300-BC600) was abiotically incubated for one year to examine the aging effect of the temperature series of biochars on their sorption of aromatic cationic herbicides (ACHs, paraquat and diquat) as well as a nonpolar reference adsorbate (naphthalene). One year of oxidation showed no obvious effect on the surface area, but distinct increases in the O/C elemental ratio, density of the surface groups and cation exchange capacity (CEC) were observed. Therefore, these properties were significantly affected by the charring temperature. After incubation, high-temperature biochars (BC500 and BC600) displayed a 14.1-36.3% decrease in the sorption (qm) of ACHs. The alteration of their sorption tendency was similar to the reduced sorption of naphthalene on oxidized biochars, in which the increased surface groups lowered the surface area accessible to adsorbates because of blockage by adsorbed water molecule clusters. Conversely, a pronounced increase of ACHs sorption by 121.7-201.1% on the low-temperature biochar (BC300) was observed, presumably due to the increase of CEC values after oxidation. This result was further demonstrated by a significant linear relationship between the paraquat sorption (qm) and CEC values (R(2)=0.9895) of oxidized biochars. Interestingly, one year of oxidation simultaneously resulted in an enhanced sorption of paraquat and a reduced sorption of diquat on BC400, which indicated that the oxidation-induced sorption change of ACHs is a complex function of changes in the surface properties of the biochars as well as the molecular structure of the solute.
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Affiliation(s)
- Kaishun Shi
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Ya Xie
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China
| | - Yuping Qiu
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
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64
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Probing immobilization mechanism of alpha-chymotrypsin onto carbon nanotube in organic media by molecular dynamics simulation. Sci Rep 2015; 5:9297. [PMID: 25787884 PMCID: PMC4365409 DOI: 10.1038/srep09297] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 02/26/2015] [Indexed: 11/16/2022] Open
Abstract
The enzyme immobilization has been adopted to enhance the activity and stability of enzymes in non-aqueous enzymatic catalysis. However, the activation and stabilization mechanism has been poorly understood on experiments. Thus, we used molecular dynamics simulation to study the adsorption of α-chymotrypsin (α-ChT) on carbon nanotube (CNT) in aqueous solution and heptane media. The results indicate that α-ChT has stronger affinity with CNT in aqueous solution than in heptane media, as confirmed by more adsorption atoms, larger contact area and higher binding free energies. Although the immobilization causes significant structure deviations from the crystal one, no significant changes in secondary structure of the enzyme upon adsorption are observed in the two media. Different from aqueous solution, the stabilization effects on some local regions far from the surface of CNT were observed in heptane media, in particular for S1 pocket, which should contribute to the preservation of specificity reported by experiments. Also, CNT displays to some extent stabilization role in retaining the catalytic H-bond network of the active site in heptane media, which should be associated with the enhanced activity of enzymes. The observations from the work can provide valuable information for improving the catalytic properties of enzymes in non-aqueous media.
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65
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Li X, Gámiz B, Wang Y, Pignatello JJ, Xing B. Competitive sorption used to probe strong hydrogen bonding sites for weak organic acids on carbon nanotubes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:1409-1417. [PMID: 25564729 DOI: 10.1021/es504019u] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We recently proposed that weak acids (AH) adsorb to partially oxidized carbonaceous materials in part by forming strong hydrogen bonds with acidic surface groups, depicted by (A···H···O-surf)(-), known as negative charge-assisted hydrogen bonds, (-)CAHBs. Here we use competition experiments to show that sorption of AH on carbon nanotubes (CNTs) can be described conceptually by a dual specific/nonspecific domain model, where one domain involves (-)CAHB sites that can become saturated. The trends observed in single-solute adsorption, including the stoichiometric release of hydroxide upon sorption of carboxyate or phenolate anions, were consistent with trends in the previous studies and pointed to the formation of (-)CAHB. 3,4-Dinitrophenolate formed (-)CAHBs more efficiently than did 2,6-dichloro-4-nitrophenolate because of alleviation of steric hindrance to approach by the ortho chlorines. Competition against a (-)CAHB-capable target compound was greater when the competitor was also (-)CAHB-capable than when it was not (e.g., benzoate as target vs 3,4-dinitrophenolate or nitrobenzene as competitor; mono-n-butyl phthalate as target vs methyl benzoate or p-tolyl acetate as competitor). Experiments also revealed competition between the nitroaromatic species for π-π electron donor-acceptor sites. The findings will contribute to a better understanding of the adsorption mechanism of ionizable compounds on carbonaceous materials.
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Affiliation(s)
- Xiaoyun Li
- College of Resources and Environment, Northwest A&F University , Yangling, Shaanxi 712100, China
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66
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Kah M, Zhang X, Hofmann T. Sorption behavior of carbon nanotubes: changes induced by functionalization, sonication and natural organic matter. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 497-498:133-138. [PMID: 25128883 DOI: 10.1016/j.scitotenv.2014.07.112] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 07/28/2014] [Accepted: 07/28/2014] [Indexed: 06/03/2023]
Abstract
The effect of functionalization on the sorption behavior of carbon nanotubes (CNTs) remains poorly understood, especially when combined with other factors affecting dispersion. The sorption behavior of a series of functionalized CNTs towards pyrene has therefore been systematically evaluated over a wide range of concentrations and dispersion scenarios. When studied as purchased (in the absence of humic acids and sonication treatment), sorption isotherms showed that OH-, COOH- and NH2-CNTs exhibited significantly different sorption affinity for pyrene. Sonication greatly increased both the sorption affinity and the maximum capacity of all types of functionalized CNTs, to an extent that overwhelmed the differences initially observed (increase of up to 1.5 orders of magnitude lead to log Kd values close to 9 L/kg). Results demonstrate that a significant proportion of the CNT surface was unavailable to pyrene prior to sonication. The presence of humic acids enhanced dispersion but decreased sorption, especially when combined with sonication. Sorption affinity, however, remained very high in all cases (log Kd>7.5 L/kg), suggesting that CNTs can act as strong sorbents under a wide range of conditions.
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Affiliation(s)
- Melanie Kah
- Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, Vienna 1090, Austria.
| | - Xiaoran Zhang
- Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, Vienna 1090, Austria; School of Environment and Energy Engineering, Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Zhanlanguan Road 1, Xicheng District, Beijing, 100044, China
| | - Thilo Hofmann
- Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, Vienna 1090, Austria.
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67
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Wang C, Li H, Liao S, Zhang D, Wu M, Pan B, Xing B. Sorption affinities of sulfamethoxazole and carbamazepine to two sorbents under co-sorption systems. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2014; 194:203-209. [PMID: 25150454 DOI: 10.1016/j.envpol.2014.07.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Revised: 07/26/2014] [Accepted: 07/28/2014] [Indexed: 05/05/2023]
Abstract
The Kd of sulfamethoxazole (SMX) on activated carbon (AC) was larger than that of SMX on single-walled carbon nanotubes (SC), but the competition of SMX with carbamazepine (CBZ) for adsorption sites was weaker on AC than SC. Thus, a large Kd value does not necessarily reflect a high affinity. The analysis of the apparent sorption, competition, desorption hysteresis, and the sorption thermodynamics for SMX and CBZ did not provide sufficient information to distinguish their sorption affinities. The release of the adsorbed CBZ was not altered with SMX as the competitor, but SMX release increased significantly after CBZ addition. The higher sorption affinity of CBZ may be explained by the interactions of the CBZ benzene rings with the aromatic structures of the adsorbents. Although the thermodynamic meaning cannot be described, the release ratio of the adsorbed pollutants provides useful information for understanding pollutant sorption strength and associated risks.
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Affiliation(s)
- Chi Wang
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China
| | - Hao Li
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China
| | - Shaohua Liao
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China
| | - Di Zhang
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China
| | - Min Wu
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China
| | - Bo Pan
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China.
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, USA
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68
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Chen R, Zhang Y, Sahneh FD, Scoglio CM, Wohlleben W, Haase A, Monteiro-Riviere NA, Riviere JE. Nanoparticle surface characterization and clustering through concentration-dependent surface adsorption modeling. ACS NANO 2014; 8:9446-9456. [PMID: 25133703 DOI: 10.1021/nn503573s] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Quantitative characterization of nanoparticle interactions with their surrounding environment is vital for safe nanotechnological development and standardization. A recent quantitative measure, the biological surface adsorption index (BSAI), has demonstrated promising applications in nanomaterial surface characterization and biological/environmental prediction. This paper further advances the approach beyond the application of five descriptors in the original BSAI to address the concentration dependence of the descriptors, enabling better prediction of the adsorption profile and more accurate categorization of nanomaterials based on their surface properties. Statistical analysis on the obtained adsorption data was performed based on three different models: the original BSAI, a concentration-dependent polynomial model, and an infinite dilution model. These advancements in BSAI modeling showed a promising development in the application of quantitative predictive modeling in biological applications, nanomedicine, and environmental safety assessment of nanomaterials.
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Affiliation(s)
- Ran Chen
- Institute of Computational Comparative Medicine, ‡Nanotechnology Innovation Center of Kansas State, §Electrical and Computer Engineering Department, and ∥Anatomy and Physiology Department, Kansas State University , Manhattan, Kansas 66506, United States
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69
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Recent applications of carbon nanotube sorbents in analytical chemistry. J Chromatogr A 2014; 1357:110-46. [DOI: 10.1016/j.chroma.2014.05.035] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 05/12/2014] [Accepted: 05/13/2014] [Indexed: 01/10/2023]
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70
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Concentration-dependent polyparameter linear free energy relationships to predict organic compound sorption on carbon nanotubes. Sci Rep 2014; 4:3888. [PMID: 24463462 PMCID: PMC3902440 DOI: 10.1038/srep03888] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 12/30/2013] [Indexed: 11/08/2022] Open
Abstract
Adsorption of organic compounds on carbon nanotubes (CNTs), governed by interactions between molecules and CNTs surfaces, is critical for their fate, transport, bioavailability and toxicity in the environment. Here, we report a promising concentration-dependent polyparameter linear free energy relationships (pp-LFERs) model to describe the compound-CNTs interactions and to predict sorption behavior of chemicals on CNTs in a wide range of concentrations (over five orders of magnitude). The developed pp-LFERs are able to capture the dependence of the ki on equilibrium concentration. The pp-LFERs indexes [r, p, a, b, v] representing different interactions are found to have a good relationship with the aqueous equilibrium concentrations of compounds. This modified model can successfully interpret the relative contribution of each interaction at a given concentration and reliably predict sorption of various chemicals on CNTs. This approach is expected to help develop a better environmental fate and risk assessment model.
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71
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Amade R, Hussain S, Ocaña IR, Bertran E. Growth and functionalization of carbon nanotubes on quartz filter for environmental applications. ACTA ACUST UNITED AC 2014. [DOI: 10.7243/2050-1323-3-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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72
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Yang K, Wei W, Qi L, Wu W, Jing Q, Lin D. Are engineered nanomaterials superior adsorbents for removal and pre-concentration of heavy metal cations from water? RSC Adv 2014. [DOI: 10.1039/c4ra09375e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We observed that the removal of metal ions with engineered nanomaterials could be largely attributed to precipitation by forming metal hydroxyl precipitates rather than adsorption, implying that ENMs cannot be superior adsorbents.
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Affiliation(s)
- Kun Yang
- Department of Environmental Science
- Zhejiang University
- Hangzhou 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control
- Hangzhou 310058, China
| | - Wei Wei
- Department of Environmental Science
- Zhejiang University
- Hangzhou 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control
- Hangzhou 310058, China
| | - Long Qi
- Department of Environmental Science
- Zhejiang University
- Hangzhou 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control
- Hangzhou 310058, China
| | - WenHao Wu
- Department of Environmental Science
- Zhejiang University
- Hangzhou 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control
- Hangzhou 310058, China
| | - QingFeng Jing
- Department of Environmental Science
- Zhejiang University
- Hangzhou 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control
- Hangzhou 310058, China
| | - DaoHui Lin
- Department of Environmental Science
- Zhejiang University
- Hangzhou 310058, China
- Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control
- Hangzhou 310058, China
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73
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Ding C, Cheng W, Sun Y, Wang X. Retracted Article: Determination of chemical affinity of graphene oxide nanosheets with radionuclides investigated by macroscopic, spectroscopic and modeling techniques. Dalton Trans 2014; 43:3888-96. [DOI: 10.1039/c3dt52881b] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The chemical affinity of graphene oxide nanosheets with radionuclides (Eu(iii) and U(vi)) was determined by macroscopic, spectroscopic and modeling techniques.
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Affiliation(s)
- Congcong Ding
- Key Lab of Novel Thin Film Solar Cells
- Chinese Academy of Sciences
- Hefei
- P.R. China
| | - Wencai Cheng
- School of Life Science
- Sichuan University
- Chengdu
- P.R. China
| | - Yubing Sun
- Key Lab of Novel Thin Film Solar Cells
- Chinese Academy of Sciences
- Hefei
- P.R. China
| | - Xiangke Wang
- Key Lab of Novel Thin Film Solar Cells
- Chinese Academy of Sciences
- Hefei
- P.R. China
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74
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Sun Y, Yang S, Zhao G, Wang Q, Wang X. Adsorption of Polycyclic Aromatic Hydrocarbons on Graphene Oxides and Reduced Graphene Oxides. Chem Asian J 2013; 8:2755-61. [DOI: 10.1002/asia.201300496] [Citation(s) in RCA: 134] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 05/02/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Yubing Sun
- Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei, 230031 (P.R. China)
| | - Shubin Yang
- Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei, 230031 (P.R. China)
| | - Guixia Zhao
- Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei, 230031 (P.R. China)
| | - Qi Wang
- Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei, 230031 (P.R. China)
| | - Xiangke Wang
- School for Radiological and Interdisciplinary Sciences, Soochow University, Suzhou, 215123, P.R. China
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75
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Wu W, Jiang W, Zhang W, Lin D, Yang K. Influence of functional groups on desorption of organic compounds from carbon nanotubes into water: insight into desorption hysteresis. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:8373-8382. [PMID: 23848495 DOI: 10.1021/es401567g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Adsorption-desorption of nitrobenzenes, phenols, and anilines on five multiwalled carbon nanotubes (MWCNTs) with different degrees of surface oxidation were investigated to examine the influence of functional groups of both organic chemicals and CNTs on desorption hysteresis. Desorption hysteresis was not observed for nitrobenzenes, phenols, and 4-nitroaniline from all MWCNTs. Significant desorption hysteresis was observed for aniline and 4-methylaniline on surface-oxidized MWCNTs but not on unoxidized MWCNTs. Formation of an irreversible amide bond (i.e.,-CONH-) by amidation reaction of amino group of anilines with oxygen-containing groups (i.e., carboxyl or lactonic groups) on MWCNTs was observed. We proposed that desorption hysteresis could be attributed to the immobilization of organic compounds on the surface of CNTs resulting from the irreversible chemical reaction/binding. The irreversible chemical immobilization is compound functional group selective and dependent on the surface oxygen-containing groups of CNTs. Hysteresis index (HI) values of aniline or 4-methylaniline on MWCNTs increased with the amounts of oxygen-containing groups on MWCNTs. Moreover, HI values of anilines on a given oxidized MWCNT followed an order of 4-nitroaniline < 4-chloroaniline < aniline < 4-methylaniline.
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Affiliation(s)
- Wenhao Wu
- Department of Environmental Science, Zhejiang University , Hangzhou 310058, China
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76
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Liu X, Wang M, Zhang S, Pan B. Application potential of carbon nanotubes in water treatment: A review. J Environ Sci (China) 2013; 25:1263-1280. [PMID: 24218837 DOI: 10.1016/s1001-0742(12)60161-2] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Water treatment is the key to coping with the conflict between people's increasing demand for water and the world-wide water shortage. Owing to their unique and tunable structural, physical, and chemical properties, carbon nanotubes (CNTs) have exhibited great potentials in water treatment. This review makes an attempt to provide an overview of potential solutions to various environmental challenges by using CNTs as adsorbents, catalysts or catalyst support, membranes, and electrodes. The merits of incorporating CNT to conventional water-treatment material are emphasized, and the remaining challenges are discussed.
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Affiliation(s)
- Xitong Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
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77
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Martinez DST, Alves OL, Barbieri E. Carbon nanotubes enhanced the lead toxicity on the freshwater fish. ACTA ACUST UNITED AC 2013. [DOI: 10.1088/1742-6596/429/1/012043] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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78
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Adsorption of naphthalene and its derivatives on magnetic graphene composites and the mechanism investigation. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2012.11.063] [Citation(s) in RCA: 141] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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