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Cao H, Zhou Z, Wang C, Sun H. Adsorption of Phenanthrene on Multi-Walled Carbon Nanotubes in the Presence of Nonionic Surfactants. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:3648. [PMID: 36834341 PMCID: PMC9959379 DOI: 10.3390/ijerph20043648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Accepted: 02/16/2023] [Indexed: 06/18/2023]
Abstract
The bioavailability and mobility of phenanthrene (Phe) adsorbed by multi-walled carbon nanotubes (MWCNTs) may be substantially influenced by nonionic surfactants used both in the synthesis and dispersion of MWCNTs. The adsorption mechanisms of Phe adsorbed onto MWCNTs under the different nonionic surfactants Tween 80 (TW-80) and Triton X-100 (TX-100) in the aqueous phase were investigated in terms of changes in the MWCNTs' compositions and structures. The results showed that TW-80 and TX-100 were easily adsorbed onto MWCNTs. Phe adsorption data onto MWCNTs were better suited to the Langmuir equation than the Freundlich equation. Both TW-80 and TX-100 reduced the adsorption capacity of Phe onto MWCNTs. When TW-80 and TX-100 were added in the adsorption system, the saturated adsorption mass of Phe decreased from 35.97 mg/g to 27.10 and 29.79 mg/g, respectively, which can be attributed to the following three reasons. Firstly, the hydrophobic interactions between MWCNTs and Phe became weakened in the presence of nonionic surfactants. Secondly, the nonionic surfactants covered the adsorption sites of MWCNTs, which caused Phe adsorption to be reduced. Finally, nonionic surfactants can also promote the desorption of Phe from MWCNTs.
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Affiliation(s)
| | | | - Cuiping Wang
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
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Cataldo S, Muratore N, Giannici F, Bongiorno D, Chiodo V, Maisano S, Pettignano A. Hydrocarbons removal from synthetic bilge water by adsorption onto biochars of dead Posidonia oceanica. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:90231-90247. [PMID: 35869342 PMCID: PMC9722887 DOI: 10.1007/s11356-022-21998-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 07/09/2022] [Indexed: 06/15/2023]
Abstract
Bilge waters are wastewaters produced on boats during navigation and usually contain hydrocarbons and oils. They cannot be directly released into the sea if not below a hydrocarbons concentration limit set by current legislation. Appropriate oil in water separator (OWS) systems can be installed on board boats to remove hydrocarbons from bilge water allowing their spillage into the sea. These systems may contain an adsorption step on a suitable adsorbent. Here, biochars produced from pyrolysis of dead Posidonia oceanica, pristine or chemically activated, have been tested as hydrocarbons adsorbents. Adsorption experiments with aqueous dispersions simulating bilge waters containing a marine gas oil (MGO) fuel for boats, a surfactant, and different NaCl concentrations were carrying out. The hydrocarbons concentrations before and after adsorption have been directly measured by using the reverse phase HPLC technique coupled with a fluorescence detector. These measurements are very fast and their reliability was verified by re-measuring the hydrocarbons concentrations of some samples with the GC-MS-MS technique, according to one of the traditional methods for hydrocarbons determination in emulsions. Different isotherm equations were used to fit the adsorption data. The biochars were characterized from the chemical-structural point of view by means of several instrumental techniques.
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Affiliation(s)
- Salvatore Cataldo
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, V.le delle Scienze, ed. 17, 90128, Palermo, Italy
| | - Nicola Muratore
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, V.le delle Scienze, ed. 17, 90128, Palermo, Italy
| | - Francesco Giannici
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, V.le delle Scienze, ed. 17, 90128, Palermo, Italy
| | - David Bongiorno
- Dipartimento di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche (STEBICEF), Università di Palermo, V.le delle Scienze, ed. 17, 90128, Palermo, Italy
| | - Vitaliano Chiodo
- Istituto CNR-ITAE, via Salita S. Lucia sopra Contesse 5, 98126, Messina, Italy
| | - Susanna Maisano
- Istituto CNR-ITAE, via Salita S. Lucia sopra Contesse 5, 98126, Messina, Italy
| | - Alberto Pettignano
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, V.le delle Scienze, ed. 17, 90128, Palermo, Italy.
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Tabassum S, Thangaiyan P, Govindaraju S, Daniel NK, Thomas R. Pyrazole Derivative Containing Naphthalene Moiety: Cytotoxocity (Breast and Cervical Cancer), Antibacterial and Antifungal Studies Using Experimental and Theoretical Tools. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2022.2149564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Affiliation(s)
| | - Pooventhiran Thangaiyan
- Department of Chemistry, St Berchmans College, Changanaserry, India
- Department of Mechanical Engineering, University Centre for Research & Development Chandigarh University, Mohali, India
| | - Santhosh Govindaraju
- Department of Sciences and Humanities, School of Engineering and Technology, CHRIST (Deemed to Be University), Bengaluru, India
| | - Nobi K. Daniel
- Department of Sciences and Humanities, School of Engineering and Technology, CHRIST (Deemed to Be University), Bengaluru, India
| | - Renjith Thomas
- Department of Chemistry, St Berchmans College, Changanaserry, India
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Xiong Y, Huang X, Li L, Liu W, Zhang J, He M, Liu J, Lu L, Peng K. Destructing surfactant network in nanoemulsions by positively charged magnetic nanorods to enhance oil-water separation. J Environ Sci (China) 2022; 118:112-121. [PMID: 35305759 DOI: 10.1016/j.jes.2021.08.039] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/07/2021] [Accepted: 08/19/2021] [Indexed: 06/14/2023]
Abstract
The separation of ultrafine oil droplets from wasted nanoemulsions stabilized with high concentration of surfactants is precondition for oil reuse and the safe discharge of effluent. However, the double barriers of the interfacial film and network structures formed by surfactants in nanoemulsions significantly impede the oil-water separation. To destroy these surfactant protective layers, we proposed a newly-developed polyethyleneimine micelle template approach to achieve simultaneous surface charge manipulation and morphology transformation of magnetic nanospheres to magnetic nanorods. The results revealed that positively charged magnetic nanospheres exhibited limited separation performance of nanoemulsions, with a maximum chemical oxygen demand (COD) removal of 50%, whereas magnetic nanorods achieved more than 95% COD removal in less than 30 s. The magnetic nanorods were also applicable to wasted nanoemulsions from different sources and exhibited excellent resistance to wide pH changes. Owing to their unique one-dimensional structure, the interfacial dispersion of magnetic nanorods was significantly promoted, leading to the efficient capture of surfactants and widespread destruction of both the interfacial film and network structure, which facilitated droplet merging into the oil phase. The easy-to-prepare and easy-to-tune strategy in this study paves a feasible avenue to simultaneously tailor surface charge and morphology of magnetic nanoparticles, and reveals the huge potential of morphology manipulation for producing high-performance nanomaterials to be applied in complex interfacial interaction process. We believe that the newly-developed magnetic-nanorods significantly contribute to hazardous oily waste remediation and advances technology evolution toward problematic oil-pollution control.
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Affiliation(s)
- Yongjiao Xiong
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, China
| | - Xiangfeng Huang
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, China
| | - Lexue Li
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, China
| | - Wanqi Liu
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, China
| | - Jialu Zhang
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, China
| | - Mengfan He
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, China
| | - Jia Liu
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, China
| | - Lijun Lu
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, China
| | - Kaiming Peng
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, China.
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Xie D, Huang H, Zhang H, Shen F, Jiang M, Li X, Shang H, Ma J, Zhao S. Extractive removal of micro and trace nitrofen, 2, 4-dichlorophenol and p-nitrotrophenol from water/soil by humic acid ester ether. ENVIRONMENTAL TECHNOLOGY 2022; 43:1968-1979. [PMID: 33655807 DOI: 10.1080/09593330.2020.1862307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 12/05/2020] [Indexed: 06/12/2023]
Abstract
The amphiphilic humic acid ester ether (HAEE), as a kind of solid-phase extractant with characteristics of easy separation and hydrophilic-hydrophobic amphiphilic property, was prepared and used to extract micro or trace nitrofen, 2,4-dichlorophenol and p-nitrotrophenol (NIPs) from water and soil. Degradation of NIPs and extractant regeneration were carried out by simple photocatalysis. The adsorption equilibrium of the mono- or three mixed NIPs by HAEE in aqueous could be quickly reached within 20 min. The adsorption process was fit to quasi-second-order kinetics model and Friendlich thermodynamics model. The possible adsorption interaction was discussed. Results suggested that the adsorption of NIPs onto HAEE predominated by hydrogen bonding, hydrophobic interaction and π-π interaction. The extraction capacity of mixed NIPs (80 μg/L each component) by HAEE was up to 0.38 mg/g and tended to be multi-layer adsorption, in which p-nitrotrophenol had higher adsorption competitiveness because of lower resistance to HAEE. When HAEE-NIPs were degraded by photo-catalyst Fe0/F-TiO2 for 8 h, not only the adsorbed NIPs could be totally degraded and mineralized, but also the HAEE could be effectively regenerated. When the NIPs were continuously extracted from 40-year aging soil for three times (regenerative twice) by combined extractant (48 mL H2O + 2 mL n-hexane + 0.1 g HAEE), the total extraction efficiency of NIPs could reach to 84.66%. This research could supplement the theory and technique for harmless treatment of NIPs contaminated water and soil.
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Affiliation(s)
- Dairui Xie
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, People's Republic of China
| | - Hao Huang
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, People's Republic of China
| | - Heng Zhang
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, People's Republic of China
| | - Fang Shen
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, People's Republic of China
| | - Meng Jiang
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, People's Republic of China
| | - Xiaoting Li
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, People's Republic of China
| | - Hongyan Shang
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, People's Republic of China
| | - Jun Ma
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, People's Republic of China
| | - Shilin Zhao
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, People's Republic of China
- Key Laboratory of Land Resources Evaluation and Monitoring in Southwest, Ministry of Education of China, Chengdu, People's Republic of China
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Badmus SO, Amusa HK, Oyehan TA, Saleh TA. Environmental risks and toxicity of surfactants: overview of analysis, assessment, and remediation techniques. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:62085-62104. [PMID: 34590224 PMCID: PMC8480275 DOI: 10.1007/s11356-021-16483-w] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 09/07/2021] [Indexed: 05/08/2023]
Abstract
This work comprehensively reviewed the toxicity and risks of various surfactants and their degraded products in the environmental matrices, various analytical procedures, and remediation methods for these surfactants. The findings revealed that the elevated concentration of surfactants and their degraded products disrupt microbial dynamics and their important biogeochemical processes, hinder plant-surviving processes and their ecological niche, and retard the human organic and systemic functionalities. The enormous adverse effects of surfactants on health and the environment necessitate the need to develop, select, and advance the various analytical and assessment techniques to achieve effective identification and quantification of several surfactants in different environmental matrices. Considering the presence of surfactants in trace concentration and environmental matrices, excellent analysis can only be achieved with appropriate extraction, purification, and preconcentration. Despite these pre-treatment procedures, the chromatographic technique is the preferred analytical technique considering its advancement and shortcomings of other techniques. In the literature, the choice or selection of remediation techniques for surfactants depends largely on eco-friendliness, cost-implications, energy requirements, regeneration potential, and generated sludge composition and volume. Hence, the applications of foam fractionation, electrochemical advanced oxidation processes, thermophilic aerobic membranes reactors, and advanced adsorbents are impressive in the clean-up of the surfactants in the environment. This article presents a compendium of knowledge on environmental toxicity and risks, analytical techniques, and remediation methods of surfactants as a guide for policymakers and researchers.
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Affiliation(s)
- Suaibu O Badmus
- Center for Integrative Petroleum Research, King Fahd University of Petroleum & Minerals, 31261, Dhahran, Saudi Arabia
| | - Hussein K Amusa
- Department of Chemical Engineering, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia
| | - Tajudeen A Oyehan
- Center for Integrative Petroleum Research, King Fahd University of Petroleum & Minerals, 31261, Dhahran, Saudi Arabia
| | - Tawfik A Saleh
- Department of Chemistry, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia.
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Adsorption of 17α-Ethinyl Estradiol and Bisphenol A to Graphene-Based Materials: Effects of Configuration of Adsorbates and the Presence of Cationic Surfactant. ADSORPT SCI TECHNOL 2021. [DOI: 10.1155/2021/9970268] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Endocrine-disrupting chemicals (EDCs) have attracted much attention in recent years. Graphene-based materials (GMs) have been deemed as excellent adsorbents for the removal of EDCs. The objective of the present study was to understand how the cationic surfactants (CTAB; cetyltrimethylammonium nitrate) affect the adsorption of EDCs (17α-ethinyl estradiol (EE2) and bisphenol A (BPA)) on graphene oxide (GO), reduced graphene oxides (RGOs), and the few-layered commercial graphene (CG). It was observed that the presence of CTAB showed different effects on the adsorption of EDCs to different GMs. The adsorption of EDCs on GO was enhanced because of the enhanced hydrophobicity of GMs after the adsorption of CTAB and the newly formed hemimicelles by the adsorbed CTAB, which could serve as the partition phase for EDCs. Moreover, the electron donor-acceptor interaction and cation bridging effect of the –NH4+ group of the adsorbed CTAB between EDCs and GMs could also enhance the adsorption of EDCs to GMs. With the increase of the extent of GM reduction, the adsorption enhancement by the presence of CTAB weakened. This could be attributed to the competition and pore blockage effect caused by the adsorbed CTAB. It is worth noting that the enhancement of CTAB on the adsorption of BPA to GMs was more profound than that of EE2. This is likely because the pore blockage effect plays a less important role in the adsorption of BPA due to its smaller molecular diameter and deformable structure.
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Li Q, Zhang W, Guo Y, Chen H, Ding Q, Zhang L. Oxygenated carbon nanotubes cages coated solid-phase microextraction fiber for selective extraction of migrated aromatic amines from food contact materials. J Chromatogr A 2021; 1646:462031. [PMID: 33857834 DOI: 10.1016/j.chroma.2021.462031] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 02/22/2021] [Accepted: 02/25/2021] [Indexed: 10/22/2022]
Abstract
In this study, an oxygenated carbon nanotubes cages (OCNTCs) material was prepared by calcinating zeolitic imidazole framework-67 (ZIF-67) and then oxidizing the resulting material. The OCNTCs was used as a high efficient solid-phase microextraction (SPME) coating to extract aromatic amines (AAs). The obtained fiber exhibited high selectivity for AAs over other organic compounds in food contact materials (FCMs) due to matched pore size and abundant oxygen-containing groups. Subsequently, coupled with gas chromatography-tandem mass spectrometry (GC-MS/MS), a sensitive method with low limits of detection (0.1-2.0 ng L-1), wide linear ranges (0.5-500 ng L -1) and good precision (RSDs ≤ 8.6%) was developed for analysis of AAs. The specific migrated AAs from food simulants that prepared by standardized migration and thermal migration test were successfully analysed by this developed method with satisfactory recoveries (81.6% - 118.1%) and precision (RSDs, 2.1-9.5%). The results demonstrated that the prepared OCNTCs-coated fibers displayed excellent extraction performance, suggesting a promising application to investigate the migration behaviors of AAs.
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Affiliation(s)
- Qingqing Li
- Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Province Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116, China
| | - Wenmin Zhang
- Division of Chemical and Biological Engineering, Minjiang Teachers College, Fuzhou, Fujian, 350108, China
| | - Yuheng Guo
- Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Province Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116, China
| | - Hui Chen
- Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Province Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116, China
| | - Qingqing Ding
- Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Province Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116, China
| | - Lan Zhang
- Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Province Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116, China.
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Guo J, Wen X. Performance and kinetics of benzo(a)pyrene biodegradation in contaminated water and soil and improvement of soil properties by biosurfactant amendment. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 207:111292. [PMID: 32919193 DOI: 10.1016/j.ecoenv.2020.111292] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/31/2020] [Accepted: 09/02/2020] [Indexed: 06/11/2023]
Abstract
As a hydrophobic pollutant, benzo(a)pyrene (BaP) is difficult to be degraded by microbes due to its poor water solubility. To improve its water solubility, this study harvested a biosurfactant from swine wastewater. The role of the biosurfactant in BaP biodegradation in contaminated water and soil were investigated. The biodegradation kinetics of BaP in contaminated water and the improvement of soil properties were determined. Results showed that critical micelle concentration (CMC) of the biosurfactant was 46.8 mg/L. The biosurfactant has a high pH stability in range of 3-9 and a strong salt stability in NaCl concentration range of 0-20%. At concentrations of 1, 2, 3, 4 and 5 CMC, the biosurfactant increased BaP water solubility by 1.4, 2.6, 4.0, 5.2 and 6.6 times. BaP biodegradation in contaminated water was effectively promoted by the biosurfactant, and the concentrations of BaP in sludge phase decreased to 1.015 mg/L (47.9% decrement) and 0.675 mg/L (65.4% decrement) when the dosed biosurfactant were 1 and 3 CMC, respectively. The biodegradation kinetics of BaP in contaminated water by the biosurfactant fitted well with the two-compartment kinetic model well (R2 > 0.90). For the bioremediation of BaP contaminated soil, adding 0.1%-0.5% (w/w) biosurfactant biodegraded 39.2%-84.8% of BaP, while the control without biosurfactant was 24.2%. In addition, the application of the biosurfactant significantly improved the properties of the contaminated soil, behaved as the increase in microbial quantity, water holding capacity (WHC) and dehydrogenase (DH) activity of the soil. To sum up, the biosurfactant facilitated the BaP biodegradation and can be effectively used in in-site remediation of polycyclic aromatic hydrocarbons (PAHs) (BaP in this study) contaminated water and soil.
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Affiliation(s)
- Junyuan Guo
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan, 610225, China.
| | - Xiaoying Wen
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan, 610225, China
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Nisha S, Senthil Kumar A. Highly redox-active organic molecular nanomaterials: Naphthalene and phenanthrene molecular species π-stacked MWCNT modified electrodes for oxygen-interference free H2O2 sensing in neutral pH. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114680] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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11
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Rippner DA, Lien J, Balla H, Guo T, Green PG, Young TM, Parikh SJ. Surface modification induced cuprous oxide nanoparticle toxicity to duckweed at sub-toxic metal concentrations. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 722:137607. [PMID: 32213435 DOI: 10.1016/j.scitotenv.2020.137607] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 02/21/2020] [Accepted: 02/26/2020] [Indexed: 06/10/2023]
Abstract
Nanoparticle capping agents are critical for controlling the growth, oxidation state, and final particle size during aqueous synthesis. However, despite the known phytotoxicity of cetyltrimethylammonium bromide (CTAB) to plants, it is used to synthesize metal oxide nanoparticles of uniform size and with mesoporous structure. Among the few studies that have investigated how CTAB influences nanoparticle toxicity, CTAB has never been identified as the primary cause of nanoparticle toxicity in environmental systems; rather nanoparticle surface charge or morphology was identified as the driver of toxicity in environmentally relevant systems. In the current study, CTAB release from CTAB surface modified Cu2O nanoparticles (SM-Cu2O NPs) inhibited duckweed (Landoltia punctata) growth, even when administered at subtoxic Cu concentrations. Organic ligands, such as humic acid (HA) and ethylenediaminetetraacetic acid (EDTA), lessened growth inhibition associated with exposure to SM-Cu2O NPs, likely through electrostatic and hydrophobic interactions with CTAB. Such results highlight the need for a more holistic approach to nanoparticle surface modification and improved communication between toxicologists and synthetic chemists to develop green alternatives for nanoparticle synthesis.
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Affiliation(s)
- Devin A Rippner
- Department of Land, Air and Water Resources, University of California - Davis, One Shields Avenue, Davis, CA 95616, United States of America
| | - Jennifer Lien
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States of America
| | - Hagr Balla
- Department of Land, Air and Water Resources, University of California - Davis, One Shields Avenue, Davis, CA 95616, United States of America; Department of Civil and Environmental Engineering, University of California - Davis, One Shields Avenue, Davis, CA 95616, United States of America
| | - Ting Guo
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States of America
| | - Peter G Green
- Department of Civil and Environmental Engineering, University of California - Davis, One Shields Avenue, Davis, CA 95616, United States of America
| | - Thomas M Young
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States of America
| | - Sanjai J Parikh
- Department of Land, Air and Water Resources, University of California - Davis, One Shields Avenue, Davis, CA 95616, United States of America.
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12
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Zuo X, Qian C, Ma S, Xiong J. Sulfonamide antibiotics sorption by high silica ZSM-5: Effect of pH and humic monomers (vanillin and caffeic acid). CHEMOSPHERE 2020; 248:126061. [PMID: 32028164 DOI: 10.1016/j.chemosphere.2020.126061] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 01/20/2020] [Accepted: 01/28/2020] [Indexed: 05/27/2023]
Abstract
Sulfonamides (SAs) in the aquatic environment are a serious threat to human health, environmental ecology and water reuse. Natural organic matter and SAs are known to compete for adsorption sites on adsorbent. SAs adsorption by high silica ZSM-5 (HSZSM-5) affected by humic monomers remains unclear. The impact of representative humic monomers (HMs) (caffeic acid (CA) and vanillin (VNL)) on the sorption of SAs by HSZSM-5 at different pH was evaluated for the first time. Fourier transform infrared and X-ray photoelectron spectroscopy were used to obtain the group transformations. The presence of HM did not change the main adsorption mechanism of SAs on pristine and loaded HSZSM-5 (pH-dependent and hydrophobic interaction). Lewis acid-base electron interaction, π-π electron donor-acceptor (EDA), and H-bonding had a positive contribution to the adsorption of SAs by HSZSM-5 after HM coating. However, HM coating and competition reduced the adsorption capacity of HSZSM-5 towards SAs. In co-introduction system of HM and SAs, the reaction between CO in HM and N-H in SAs resulted in SAs and HM co-adsorbed on HSZSM-5. Meanwhile, CA concentration <20 mg/L was in favor of SMX adsorption. The findings give an insight into the interactions among HM and SAs in high silica zeolites adsorption system, thereby improving SAs removal in actual water.
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Affiliation(s)
- Xingtao Zuo
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Cheng Qian
- Gezhouba Water Operation Company Limited, China Gezhouba Group, Rizhao, 276800, China
| | - Senlin Ma
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Juan Xiong
- College of Science, Huazhong Agricultural University, Wuhan, 430070, China
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Gao Q, Wu F, Hu J, Chen W, Zhang X, Guo X, Wang B, Wang X. Chemical composition-dependent removal of cationic surfactants by carbon nanotubes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 716:137017. [PMID: 32036136 DOI: 10.1016/j.scitotenv.2020.137017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 01/17/2020] [Accepted: 01/29/2020] [Indexed: 05/07/2023]
Abstract
How to attenuate water surfactant pollution using carbon nanomaterials (CNMs) has been gaining increasing research attention in recent years. However, how the composition of cationic surfactants and physicochemical properties of CNMs may affect cationic surfactant maximum removal efficiency (Refficiency-max) with minimal cost from the aqueous phase and the associated mechanisms remain largely unclear. To address this knowledge gap, we compared removal efficiency of three cationic surfactants including dodecyl dimethyl benzyl ammonium chloride (DDBAC), tetradecyl dimethyl benzyl ammonium chloride (TDBAC) and hexadecyltrimethylammonium bromide (CTAB) by various carbon nanotubes (CNTs), including pristine and OH- or COOH-functionalized multiwalled- (MWCNTs) and single-walled (SWCNTs) CNTs. The results showed that Refficiency-max of CTAB by pristine MWCNTs with an outer diameter OD < 8 nm is 50.36 ± 0.56%, while that by OH-MWCNTs with OD < 8 nm is merely 22.72 ± 0.21%. Surface area and porosity of CNTs strongly affect Refficiency-max of cationic surfactants. The MWCNTs with a smaller OD have a higher Refficiency-max than that with a larger one especially for CTAB, due to their larger surface area and porosity. Among various CNTs, SWCNTs is an ideal choice for removing cationic surfactants, especially for non-aromatic CTAB. Interestingly, for most cases, cationic surfactant removal by CNTs decreased when the amount of CNTs added exceeded a certain level, attributable to their aggregation. This implies that it is impossible to completely remove some cationic surfactants even when excess CNTs were added. The π-π bonding dominates over hydrophobic interaction in regulating cationic surfactant removal especially for those with aromatic structure. Aromatic cationic surfactants such as DDBAC and TDBAC can be removed more readily by CNTs than those without a benzene ring due to their strong π-π interactions. TDBAC has a longer hydrophobic chain relative to DDBAC, leading to a better removal efficiency by CNTs, due to stronger hydrophobic interaction.
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Affiliation(s)
- Qian Gao
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Fan Wu
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Jing Hu
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Weixiao Chen
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Xinyu Zhang
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Xiaoying Guo
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Bin Wang
- School of Public Health, Peking University, Beijing 100191, China
| | - Xilong Wang
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
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14
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Abstract
Bisphenol A (BPA) is a typical endocrine-disrupting chemical. The removal of BPA has raised much concerns in recent years. This paper examined the adsorption behavior of BPA to biochars and the different effects of cationic, anionic, and nonionic surfactants. The results indicated that peanut shell biochars prepared at 300°C (BC300), 500°C (BC500), and 700°C (BC700) showed strong adsorption affinity for BPA, and the adsorption affinity of biochars increased with the increase of pyrolysis temperature. The range of log Kd values was 2.83∼3.71, 2.91∼4.57, and 3.24∼5.50 for BC300, BC500, and BC700, respectively. Both the type of surfactants and the properties of biochars could affect the adsorption behavior of BPA. Cetyltrimethyl ammonium bromide (CTAB) showed negligible effect on the adsorption of BPA on BC300, and the inhibition effect of CTAB was stronger with the increase of biochar pyrolysis temperature. Tween 20 and sodium dodecyl benzene sulfonate (SDBS) showed stronger inhibition effect than CTAB, especially on BC300. This is likely because the inhibition effect caused by competition of CTAB may be counterbalanced by the enhancement caused by the partitioning effect by adsorbed CTAB and the bridge effect between the –NH4+ group of CTAB and the phenol group on BPA/O-functional groups of biochars, whereas Tween 20 and SDBS do not have this bridge effect advantage. This study could provide insightful information for the application of biochars in removal of BPA.
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15
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Rong Y, Han R. Adsorption of p-chlorophenol and p-nitrophenol in single and binary systems from solution using magnetic activated carbon. KOREAN J CHEM ENG 2019. [DOI: 10.1007/s11814-019-0267-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Zhao Q, Li Y, Chai X, Geng Y, Cao Y, Xu L, Zhang L, Huang J, Ning P, Tian S. Interaction of pulmonary surfactant with silica and polycyclic aromatic hydrocarbons: Implications for respiratory health. CHEMOSPHERE 2019; 222:603-610. [PMID: 30731380 DOI: 10.1016/j.chemosphere.2019.02.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Revised: 01/24/2019] [Accepted: 02/01/2019] [Indexed: 06/09/2023]
Abstract
Understanding the interaction between pulmonary surfactant (PS) and inhalable pollutants is vital for risk assessment of respiratory health. Here, PS extracted from porcine lung (EPS) was used to investigate the interaction of PS with nano-silica particles and polycyclic aromatic hydrocarbons (PAHs). Our results demonstrated that silica significantly affected the phase behavior and foaming ability of EPS; EPS and its major components (dipalmitoyl phosphatidylcholine, DPPC; bovine serum albumin, BSA) exhibited great enhancing effect on PAHs solubility, which follows the order: EPS > DPPC > BSA, and it was positively correlated with the hydrophobicity of PAHs. Further experiments demonstrated that mixed phospholipids of EPS were largely responsible for the solubilization of EPS on PAHs. In the presence of EPS, DPPC or BSA, adsorption of PAHs by silica was notably inhibited, indicating competitive adsorption between PAHs and PS components on silica. These findings provide evidence for the surface chemistry by which PS facilitates the solubilization of PAHs and reducing the adsorption of PAHs on silica, which may be helpful for deeply understanding the effects of particulate matter and PAHs on lung health.
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Affiliation(s)
- Qun Zhao
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China
| | - Yingjie Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China.
| | - Xiaolong Chai
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China
| | - Yingxue Geng
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China
| | - Yan Cao
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China
| | - Linzhen Xu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China
| | - Linfeng Zhang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China
| | - Jianhong Huang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China
| | - Ping Ning
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China
| | - Senlin Tian
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China.
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17
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Wang F, Jia Z, Su W, Shang Y, Wang ZL. Adsorption of phenanthrene and 1-naphthol to graphene oxide and L-ascorbic-acid-reduced graphene oxide: effects of pH and surfactants. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:11062-11073. [PMID: 30788701 DOI: 10.1007/s11356-019-04549-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 02/13/2019] [Indexed: 06/09/2023]
Abstract
In this study, reduced graphene oxide (RGO) was synthesized by L-ascorbic acid reduction, which was a relatively mild and environmental friendly reduction method, and the adsorption of organic contaminants was compared to graphene oxide (GO) to probe the potential adsorption mechanisms. The morphology properties of GO and RGO were characterized by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared transmission (FTIR), Raman spectrometer, transmission electron microscope (TEM), and scanning electron microscopy (SEM). The adsorption affinities of GO and RGO for phenanthrene and 1-naphthol were studied in batch experiments. The effects of pH and surfactants were also assessed. The results demonstrated that RGO reduced by L-ascorbic acid show significantly greater adsorption affinity for both phenanthrene and 1-naphthol than GO, and even greater than most of RGOs that reduced by the strong reductive reagents. This was mainly attributed to the hydrophobic interaction, π-π interaction, and H-bonding between graphene sheets and organic contaminants. Both GO and RGO showed stronger adsorption to phenanthrene than to 1-naphthol. The adsorption of 1-naphthol increased with decreasing pH and reached a maximum around pH = 7.34. The surfactants, sodium dodecyl benzene sulfaonate (SDBS) and cetyltrimethyl ammonium bromide (CTAB), had negligible influence on adsorption to GO. Note that CTAB significantly inhibited the adsorption of phenanthrene/1-naphthol on RGO, which could be attributed to the pore blockage effect. In addition, RGO could be regenerated and reused with high recyclability over five cycles. The present study suggests that RGO obtained via L-ascorbic acid reduction can be deemed as a promising material for organic contaminated wastewater treatment.
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Affiliation(s)
- Fang Wang
- Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, China
| | - Zhixuan Jia
- Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, China
| | - Wenting Su
- Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, China
| | - Yuntao Shang
- Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, China
| | - Zhong-Liang Wang
- Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, China.
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18
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Li H, Wei C, Zhang D, Pan B. Adsorption of bisphenol A on dispersed carbon nanotubes: Role of different dispersing agents. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 655:807-813. [PMID: 30481707 DOI: 10.1016/j.scitotenv.2018.11.310] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 11/16/2018] [Accepted: 11/20/2018] [Indexed: 06/09/2023]
Abstract
Although the adsorption of organic contaminants on carbon nanotubes (CNTs) and the dispersion of CNTs have been extensively investigated separately, the adsorption behavior of organic contaminants on dispersed CNTs, which may be a missing link to understanding their environmental behavior and risks, remain unclear yet rarely studied. In this study, the effect of the dispersing agent structure on the adsorption characteristics of BPA (a representative organic contaminant) on dispersed CNTs were investigated using tannic acid (TA), sodium dodecylbenzenesulfonate (SDBS), and gallic acid (GA) as model dispersing agents. Our results showed that at low dispersing agent concentrations, adsorption of TA could lead to higher CNT suspension than adsorption of SDBS and GA due to greater steric hindrance. However, the presence of TA reduced the adsorption of BPA due to strong competitive adsorption on dispersed CNTs. At high concentrations of TA, the suspension of CNTs was reduced by the "bridging effect," in which adjacent dispersed CNTs form hydrogen bonds and re-aggregate. However, the adsorption of BPA dramatically increased due to the enhanced partition of BPA into pseudomicelles of TA on dispersed CNTs, as indicated by the significantly increased index of heterogeneity at high TA concentration. Transmission electron microscopy images confirmed the formation of TA pseudomicelles. This study highlights the key role of the dispersing agent structure on CNT dispersion and adsorption of organic contaminants. The high mobility and transport of CNT-adsorbed contaminants may lead to higher environmental risks compared with aggregated CNTs.
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Affiliation(s)
- Hao Li
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China
| | - Chaoxian Wei
- 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.
| | - Bo Pan
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China
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19
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Li H, Wu W, Hao X, Wang S, You M, Han X, Zhao Q, Xing B. Removal of ciprofloxacin from aqueous solutions by ionic surfactant-modified carbon nanotubes. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 243:206-217. [PMID: 30172990 DOI: 10.1016/j.envpol.2018.08.059] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 08/04/2018] [Accepted: 08/19/2018] [Indexed: 06/08/2023]
Abstract
Ionic surfactants may impact removal efficiency of organic contaminants from aqueous solution, but research regarding the adsorption mechanisms on surfactant-modified carbon nanotubes (CNTs) was limited. In this study, three multi-walled and one single-walled CNTs were used as adsorbents to investigate the adsorption behavior and mechanisms of ciprofloxacin (CIP) on CNTs modified by ionic surfactants (cationic CTAB (Cetyltrimethylamnonium bromide) or anionic SDS (Sodium dodecyl sulfate)). More than 80% (82-88%) of the total removed CIP on CTAB-modified CNTs occurred within the first 6 h, much higher than that on SDS-modified CNTs (57-78%). Modeling adsorption kinetics demonstrated that CIP adsorption on surfactant-modified CNTs was controlled by multiple and faster processes, and both external mass transfer and intraparticle diffusion are limiting factors. Relative to SDS, CTAB was significantly (P < 0.001) concentration-dependent in suppressing CIP removal. Besides, the increase in 1/n values of Freundlich model with increasing CTAB concentration suggested that CTAB could be a stronger competitor for CIP adsorption. Hydrophobic interactions predominated zwitterionic CIP adsorption on all CNTs tested, while electrostatic interactions could help control ionizable CIP adsorption on surfactant-modified CNTs depending upon pH. CIP adsorption on modified SWCNTs significantly declined with increasing ionic strength from 1 mM to 100 mM relative to those multi-walled CNTs because the more favorable aggregation of SWCNTs reduced the CIP adsorption, irrespective of which surfactant was added. Significant desorption hysteresis of adsorbed CIP released by SDS and water was observed, but not by CTAB, by which 32.6-54.4% of adsorbed CIP were removed. For SDS-modified CNTs, the mean release ratio (RR) followed an order of MWCNTs (0.075) > MHCNTs (0.058) > SWCNTs (0.057) > MCCNTs (0.049), significantly (P < 0.001) lower than CTAB-CNTs (0.37-0.56). It can be predicted that the tested surfactants co-existing with CNTs depress removal efficiency of diverse contaminants similar to CIP in aqueous systems.
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Affiliation(s)
- Haibo Li
- School of Agriculture, Jilin University of Agricultural Science & Technology, Jilin, 132101, China; Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, USA; National Field Research Station of Agro-ecosystem in Hailun, Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin, 150081, China
| | - Wenhao Wu
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, USA
| | - Xiangxiang Hao
- National Field Research Station of Agro-ecosystem in Hailun, Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin, 150081, China
| | - Shuai Wang
- School of Agriculture, Jilin University of Agricultural Science & Technology, Jilin, 132101, China
| | - Mengyang You
- National Field Research Station of Agro-ecosystem in Hailun, Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin, 150081, China
| | - Xiaozeng Han
- National Field Research Station of Agro-ecosystem in Hailun, Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin, 150081, China
| | - Qing Zhao
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, USA.
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20
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Competitive partitioning of phenanthrene in carbon nanomaterials and anionic and nonionic micelles. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.06.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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21
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Gataullin AR, Bogdanova SA, Rakhmatullina AP, Galyametdinov YG. Dispersion of Carbon Nanotubes in Solutions of Oxyethylated Isononylphenols. RUSS J APPL CHEM+ 2018. [DOI: 10.1134/s1070427217110118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Guan Z, Tang XY, Nishimura T, Huang YM, Reid BJ. Adsorption of linear alkylbenzene sulfonates on carboxyl modified multi-walled carbon nanotubes. JOURNAL OF HAZARDOUS MATERIALS 2017; 322:205-214. [PMID: 26952082 DOI: 10.1016/j.jhazmat.2016.02.067] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 02/20/2016] [Accepted: 02/28/2016] [Indexed: 06/05/2023]
Abstract
Understanding of the adsorption behavior of organic pollutants on carbon nanotubes (CNTs) and its governing factors are crucial for the assessment of transport and fate of organic pollutants. This study explored adsorption characteristics of linear alkylbenzene sulfonates (LAS) on carboxyl modified multi-walled carbon nanotubes (CMMWCNTs) and the effect of solution chemistry and temperature on LAS sorption. Results indicted LAS adsorption isotherms to display five distinct regions of sorption at 25°C and 60°C. Regardless of temperature, the adsorption isotherm of LAS on the CMMWCNTs was well described using the Freundlich equation. This result indicated heterogeneous distribution of adsorption sites on the CMMWCNT surface. At low initial LAS concentrations, below the critical micelle concentration, (2, 10 and 50mgL-1) LAS adsorption on the CMMWCNTs followed pseudo second-order kinetics. The highest LAS adsorption was observed at ionic strengths of 1.0molL-1 for NaCl; and 0.2molL-1 for both CaCl2 and MgCl2. However, LAS sorption was greatest in the presence of sodium-divalent anion salts and at higher temperatures. These findings are of relevance to the fate and environmental risk of LAS in the presence of CMMWCNTs in high salinity wastewaters or effluents and brackish receiving surface water bodies (e.g., at estuaries).
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Affiliation(s)
- Zhuo Guan
- Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China; Laboratory of Soil Physics and Soil Hydrology, Department of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Xiang-Yu Tang
- Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China.
| | - Taku Nishimura
- Laboratory of Soil Physics and Soil Hydrology, Department of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Yu-Ming Huang
- College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Brian J Reid
- School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK
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23
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Wang F, Ren X, Sun H, Ma L, Zhu H, Xu J. Sorption of polychlorinated biphenyls onto biochars derived from corn straw and the effect of propranolol. BIORESOURCE TECHNOLOGY 2016; 219:458-465. [PMID: 27521782 DOI: 10.1016/j.biortech.2016.08.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 08/02/2016] [Accepted: 08/03/2016] [Indexed: 06/06/2023]
Abstract
The sorption of three polychlorinated biphenyls (PCBs) in single-solute and bi-solute systems in the presence of propranolol was studied on biochars at pyrolyzing temperatures of 200°C (BC200) and 700°C (BC700). Hydrophobicity and molecular planarity played a major role in PCB sorption onto BC200 and BC700, respectively. The steric hindrance caused by non-planarity made the strong specific sorption sites on BC700 less accessible to nonplanar PCBs. In bi-solute systems for BC200, propranolol monomers at an initial concentration (Cinit) of 0.8mg/L inhibited the sorption of PCB4 by competing for sorption sites. Propranolol at Cinit larger than 1.2mg/L could form hemimicelle structures on the biochar surface, providing a favorable phase for PCB4 partitioning, thereby increasing Koc up to 1.15 times. For BC700, propranolol prohibited PCB4 sorption mainly by pore-blocking, with the log Koc being reduced from 4.92 to 3.94. This study informs the application of biochar in mixture-contaminated environment.
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Affiliation(s)
- Fei Wang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Xinhao Ren
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Hongwen Sun
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
| | - Ling Ma
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Hongkai Zhu
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Jiayao Xu
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
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24
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Ersan G, Kaya Y, Apul OG, Karanfil T. Adsorption of organic contaminants by graphene nanosheets, carbon nanotubes and granular activated carbons under natural organic matter preloading conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 565:811-817. [PMID: 27107611 DOI: 10.1016/j.scitotenv.2016.03.224] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2015] [Revised: 03/20/2016] [Accepted: 03/28/2016] [Indexed: 06/05/2023]
Abstract
The effect of NOM preloading on the adsorption of phenanthrene (PNT) and trichloroethylene (TCE) by pristine graphene nanosheets (GNS) and graphene oxide nanosheet (GO) was investigated and compared with those of a single-walled carbon nanotube (SWCNT), a multi-walled carbon nanotube (MWCNT), and two coal based granular activated carbons (GACs). PNT uptake was higher than TCE by all adsorbents on both mass and surface area bases. This was attributed to the hydrophobicity of PNT. The adsorption capacities of PNT and TCE depend on the accessibility of the organic molecules to the inner regions of the adsorbent which was influenced from the molecular size of OCs. The adsorption capacities of all adsorbents decreased as a result of NOM preloading due to site competition and/or pore/interstice blockage. However, among all adsorbents, GO was generally effected least from the NOM preloading for PNT, whereas there was not observed any trend of NOM competition with a specific adsorbent for TCE. In addition, SWCNT was generally affected most from the NOM preloading for TCE and there was not any trend for PNT. The overall results indicated that the fate and transport of organic contaminants by GNSs and CNTs type of nanoadsorbents and GACs in different natural systems will be affected by water quality parameters, characteristics of adsorbent, and properties of adsorbate.
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Affiliation(s)
- Gamze Ersan
- Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, SC 29625, USA; Department of Environmental Engineering, Istanbul University, Istanbul 34320, Turkey
| | - Yasemin Kaya
- Department of Environmental Engineering, Istanbul University, Istanbul 34320, Turkey
| | - Onur G Apul
- Department of Civil, Environmental and Sustainable Engineering, Arizona State University, Tempe, AZ 85287, USA
| | - Tanju Karanfil
- Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, SC 29625, USA.
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25
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Chang X, Bouchard DC. Surfactant-Wrapped Multiwalled Carbon Nanotubes in Aquatic Systems: Surfactant Displacement in the Presence of Humic Acid. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:9214-9222. [PMID: 27500910 DOI: 10.1021/acs.est.6b01536] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Sodium dodecyl sulfate (SDS) facilitates multiwalled carbon nanotube (MWCNT) debundling and enhances nanotube stability in the aqueous environment by adsorbing on the nanotube surfaces, thereby increasing repulsive electrostatic forces and steric effects. The resulting SDS-wrapped MWCNTs are utilized in industrial applications and have been widely employed in environmental studies. In the present study, MWCNTs adsorbed SDS during ultrasonication to form stable MWCNTs suspensions. Desorption of SDS from MWCNTs surfaces was then investigated as a function of Suwannee River Humic Acid (SRHA) and background electrolyte concentrations. Due to hydrophobic effects and π-π interactions, MWCNTs exhibit higher affinity for SRHA than SDS. In the presence of SRHA, SDS adsorbed on MWCNTs was displaced. Cations (Na(+), Ca(2+)) decreased SDS desorption from MWCNTs due to charge screening effects. Interestingly, the presence of the divalent calcium cation facilitated multilayered SRHA adsorption on MWCNTs through bridging effects, while monovalent sodium reduced SRHA adsorption. Results of the present study suggest that properties of MWCNTs wrapped with commercial surfactants will be altered when these materials are released to surface waters and the surfactant coating will be displaced by natural organic matter (NOM). Changes on their surfaces will significantly affect MWCNTs fate in aquatic environments.
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Affiliation(s)
- Xiaojun Chang
- National Research Council Research Associate, 960 College Station Road, Athens, Georgia 30605, United States
| | - Dermont C Bouchard
- U.S. Environmental Protection Agency Office of Research and Development, National Exposure Research Laboratory, 960 College Station Road, Athens, Georgia 30605, United States
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26
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Oleszczuk P, Jośko I, Skwarek E. Surfactants decrease the toxicity of ZnO, TiO2 and Ni nanoparticles to Daphnia magna. ECOTOXICOLOGY (LONDON, ENGLAND) 2015; 24:1923-32. [PMID: 26410374 PMCID: PMC4661184 DOI: 10.1007/s10646-015-1529-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 08/20/2015] [Indexed: 05/12/2023]
Abstract
The objective of the study was the estimation of the effect of surfactants on the toxicity of ZnO, TiO2 and Ni nanoparticles (ENPs) towards Daphnia magna. The effect of hexadecyltrimethylammonium bromide (CTAB), triton X-100 (TX100) and 4-dodecylbenzenesulfonic acid (SDBS) was tested. The Daphtoxkit F test (conforming to OECD Guideline 202 and ISO 6341) was applied for the toxicity testing. Both the surfactants and the ENPs were toxic to D. magna. The addition of ENPs to a solution of the surfactants caused a significant reduction of toxicity of ENPs. The range of reduction of the toxicity of the ENPs depended on the kind of the ENPs and their concentration in the solution, and also on the kind of surfactant. For nano-ZnO the greatest reduction of toxicity was caused by CTAB, while for nano-TiO2 the largest drop of toxicity was observed after the addition of TX100. In the case of nano-Ni, the effect of the surfactants depended on its concentration. Most probably the reduction of toxicity of ENPs in the presence of the surfactants was related with the formation of ENPs aggregates that inhibited the availability of ENPs for D. magna.
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Affiliation(s)
- Patryk Oleszczuk
- Department of Environmental Chemistry, Faculty of Chemistry, University of Maria Skłodowska-Curie, pl. M. Curie-Sklodowskiej 3, 20-031, Lublin, Poland.
| | - Izabela Jośko
- Institute of Plant Genetics, Breeding and Biotechnology, Faculty of Agrobioengineering, University of Life Sciences in Lublin, Akademicka 15, 20-069, Lublin, Poland
| | - Ewa Skwarek
- Department of Radiochemistry and Colloid Chemistry, Faculty of Chemistry, University of Maria Skłodowska-Curie, Lublin, Poland
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27
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Lian F, Sun B, Chen X, Zhu L, Liu Z, Xing B. Effect of humic acid (HA) on sulfonamide sorption by biochars. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2015; 204:306-12. [PMID: 26057361 DOI: 10.1016/j.envpol.2015.05.030] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 05/11/2015] [Accepted: 05/12/2015] [Indexed: 05/24/2023]
Abstract
Effect of quantity and fractionation of loaded humic acid (HA) on biochar sorption for sulfonamides was investigated. The HA was applied in two different modes, i.e. pre-coating and co-introduction with sorbate. In pre-coating mode, the polar fractions of HA tended to interact with low-temperature biochars via H-bonding, while the hydrophobic fractions were likely to be adsorbed by high-temperature biochars through hydrophobic and π-π interactions, leading to different composition and structure of the HA adlayers. The influences of HA fractionation on biochar sorption for sulfonamides varied significantly, depending on the nature of interaction between HA fraction and sorbate. Meanwhile, co-introduction of HA with sulfonamides revealed that the effect of HA on sulfonamide sorption was also dependent on HA concentration. These findings suggest that the amount and fractionation of adsorbed HA are tailored by the surface properties of underlying biochars, which differently affect the sorption for organic contaminants.
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Affiliation(s)
- Fei Lian
- Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China.
| | - Binbin Sun
- Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China; College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Xi Chen
- College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Lingyan Zhu
- College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Zhongqi Liu
- Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, USA
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28
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Oyelami AO, Semple KT. The impact of carbon nanomaterials on the development of phenanthrene catabolism in soil. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2015; 17:1302-1310. [PMID: 26067741 DOI: 10.1039/c5em00157a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This study investigates the impact of different types of carbon nanomaterials (CNMs) namely C60, multi-walled carbon nanotubes (MWCNTs) and fullerene soot on the catabolism of (14)C-phenanthrene in soil by indigenous microorganisms. Different concentrations (0%, 0.01%, 0.1% and 1%) of the different CNMs were blended with soil spiked with 50 mg kg(-1) of (12)C-phenanthrene, and aged for 1, 25, 50 and 100 days. An increase in the concentration of MWCNT- and FS-amended soils showed a significant difference (P = 0.014) in the lag phase, maximum rates and overall extent of (14)C-phenanthrene mineralisation. Microbial cell numbers did not show an obvious trend, but it was observed that control soils had the highest population of heterotrophic and phenanthrene degrading bacteria at all time points.
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Affiliation(s)
- Ayodeji O Oyelami
- Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK.
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29
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Zhang J, Xiong Z, Wang L, Zhang K. Adsorption/desorption and bioavailability of methamphetamine in simulated gastrointestinal fluids under the presence of multiwalled carbon nanotubes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:9080-9089. [PMID: 25874414 DOI: 10.1007/s11356-014-3991-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Accepted: 12/12/2014] [Indexed: 06/04/2023]
Abstract
Adsorption/desorption and desorption hysteresis of methamphetamine (MMA) on carbon nanotubes (CNTs) as well as bioavailability of MMA were studied in simulated gastrointestinal fluids and background fluids. Adsorption of MMA in near-neutral (weak alkaline) intestinal fluid was enhanced, while adsorption of MMA on CNTs in acid gastric fluid was suppressed. Desorption of MMA is divided into fast and slow stages, and fast desorption conducting in the gastric fluid lasted shortly and slow desorption occurred in intestinal fluid; pepsin can enhance the release of MMA in gastrointestinal system. While, the acidic condition in gastric fluid is the main factor which causes the release of MMA. The amount of MMA released from CNTs in different fluids follows the order gastric > background (pH = 2.0) > intestinal (fed) > intestinal (fasted) > background (pH = 7.5). These findings in the simulated gastrointestinal system suggest that the release of MMA from CNTs could be promoted by biomacromolecules (such as pepsin and bile salts in digestive tract); thus, the bioavailability of MMA is enhanced.
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Affiliation(s)
- Jing Zhang
- Tianjin Key Laboratory of Water Quality Science and Technology, School of Municipal and Environmental Engineering, Tianjin Chenjian University, Tianjin, 300384, People's Republic of China
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30
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Xu L, Li J, Zhang M. Adsorption Characteristics of a Novel Carbon-Nanotube-Based Composite Adsorbent toward Organic Pollutants. Ind Eng Chem Res 2015. [DOI: 10.1021/ie5041379] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Liheng Xu
- Department of Environmental
Engineering, China Jiliang University, Hangzhou 310018, China
| | - Jinye Li
- Department of Environmental
Engineering, China Jiliang University, Hangzhou 310018, China
| | - Ming Zhang
- Department of Environmental
Engineering, China Jiliang University, Hangzhou 310018, China
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31
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Yaowarat W, Li OL, Saito N. Highly durable silica coated Pt/Cs with different surfactant types for proton exchange membrane fuel cell applications. RSC Adv 2015. [DOI: 10.1039/c5ra03343h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Platinum supported on carbon Vulcan XC-72 (Pt/Cs) for application as a cathode in proton exchange membrane fuel cells (PEMFCs) was coated with silica layers by a sol–gel method with three types of surfactants with different charging properties.
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Affiliation(s)
- Wattanachai Yaowarat
- Department of Materials, Physics and Energy Engineering
- Nagoya University
- Nagoya
- Japan
| | - Oi Lun Li
- Department of Materials, Physics and Energy Engineering
- Nagoya University
- Nagoya
- Japan
- Green Mobility Collaborative Research Center
| | - Nagahiro Saito
- Department of Materials, Physics and Energy Engineering
- Nagoya University
- Nagoya
- Japan
- Green Mobility Collaborative Research Center
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32
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Song M, Wang F, Zeng L, Yin J, Wang H, Jiang G. Co-exposure of carboxyl-functionalized single-walled carbon nanotubes and 17α-ethinylestradiol in cultured cells: effects on bioactivity and cytotoxicity. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:13978-13984. [PMID: 25383629 DOI: 10.1021/es504216a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
17α-Ethinylestradiol (EE2) is the representative of environmental estrogens. Although EE2 can interact with some engineered nanoparticles (NPs), little is known about the bioactivity of NP-associated EE2 in organisms. In this study, we investigated the combined effects of the co-exposed carboxyl-functionalized single-walled carbon nanotubes (cf-SWCNTs) and EE2 in the human breast adenocarcinoma cell line (MCF-7 cells), focusing on the cytotoxicity and bioactivity. There were no significant differences in mitochondrial activity, membrane damage, and cell apoptosis when exposed to cf-SWCNTs with and without adsorbed EE2. However, the bioactivity of adsorbed EE2 on cf-SWCNTs was significantly inhibited. The calculated effective concentration of EE2 in cultured cells showed that less than 0.2% of the total adsorbed EE2 was released, indicating that most EE2 was retained on the cf-SWCNTs during cellular exposure. Furthermore, there were no obvious changes in the bioactivity of adsorbed EE2 in the culture medium containing 5-20% fetal bovine serum (FBS), even up to 10 days of incubation, indicating that the adsorbed EE2 on cf-SWCNTs is highly stable in the cell culture medium. These results mark a promising possibility for EE2 to be adsorbed by cf-SWCNTs in environmentally relevant settings and thereby influenced its toxicity and biological fate. This is also tempting for future studies involving risk assessment ways for association between NPs and contaminants in the environment.
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Affiliation(s)
- Maoyong Song
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, People's Republic of China
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33
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Jeong SW, Kim H. Filtration of fullerene and copper oxide nanoparticles using surface-modified microfilters. ENVIRONMENTAL MONITORING AND ASSESSMENT 2014; 186:5855-5864. [PMID: 24853407 DOI: 10.1007/s10661-014-3824-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2013] [Accepted: 05/08/2014] [Indexed: 06/03/2023]
Abstract
This study evaluated the filtration of engineered nanoparticles of fullerene and copper oxide (CuO) from water by using surface-modified microsized filters. The surfaces of microsized filters of cellulose acetate and glass fibers were coated with cationic and anionic surfactants to give them positively and negatively charged surfaces, respectively. Uncoated microfilters removed 30% of a fullerene suspension, while no nanosized CuO suspension was removed. Cationic surfactant-coated filters enhanced the removal efficiency up to 70% for the fullerene suspension, while the anionic surfactant-coated filters could not remove fullerene at all. The positively charged filters with cationic surfactant coating could easily adsorb negatively charged fullerenes on their surfaces. However, none of the surfactant-coated filters removed the CuO nanoparticles because the nanoparticles were not affected by the electrical charge of the filtration medium. The Hamaker constants of nanoparticles interacting with the filter materials in water were calculated to study these interactions. The Hamaker constant of fullerene interacting with cellulose acetate in water, 4.68E - 21 J, was higher than that of interacting with quartz in water, 2.59E - 21 J. However, the Hamaker constants of CuO interacting with quartz and cellulose acetate in water were both negative values, implying repulsive van der Waals interactions. The curves of potential energy of interaction between nanoparticles and the various filter media implied that the nanoparticles were very stable in water, and so, natural deposition of nanoparticles on the filters would not occur. Therefore, electrical bonding and hydrophobic interactions were the forces dominating fullerene removal by positively charged filters.
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Affiliation(s)
- Seung-Woo Jeong
- Department of Environmental Engineering, Kunsan National University, 558 University Dr., Kunsan, 573-701, South Korea,
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34
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Velzeboer I, Kwadijk CJAF, Koelmans AA. Strong sorption of PCBs to nanoplastics, microplastics, carbon nanotubes, and fullerenes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:4869-76. [PMID: 24689832 DOI: 10.1021/es405721v] [Citation(s) in RCA: 561] [Impact Index Per Article: 56.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The presence of microplastic and carbon-based nanoparticles in the environment may have implications for the fate and effects of traditional hydrophobic chemicals. Here we present parameters for the sorption of 17 CB congeners to 10-180 μm sized polyethylene (micro-PE), 70 nm polystyrene (nano-PS), multiwalled carbon nanotubes (MWCNT), fullerene (C60), and a natural sediment in the environmentally relevant 10(-5)-10(-1) μg L(-1) concentration range. Effects of salinity and sediment organic matter fouling were assessed by measuring the isotherms in fresh- and seawater, with and without sediment present. Sorption to the "bulk" sorbents sediment organic matter (OM) and micro-PE occurred through linear hydrophobic partitioning with OM and micro-PE having similar sorption affinity. Sorption to MWCNT and nano-PS was nonlinear. PCB sorption to MWCNT and C60 was 3-4 orders of magnitude stronger than to OM and micro-PE. Sorption to nano-PS was 1-2 orders of magnitude stronger than to micro-PE, which was attributed to the higher aromaticity and surface-volume ratio of nano-PS. Organic matter effects varied among sorbents, with the largest OM fouling effect observed for the high surface sorbents MWCNT and nano-PS. Salinity decreased sorption for sediment and MWCNT but increased sorption for the polymers nano-PS and micro-PE. The exceptionally strong sorption of (planar) PCBs to C60, MWCNT, and nano-PS may imply increased hazards upon membrane transfer of these particles.
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Affiliation(s)
- I Velzeboer
- Aquatic Ecology and Water Quality Management Group, Wageningen University , P.O. Box 47, 6700 AA Wageningen, The Netherlands
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35
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Zhao J, Wang Z, Zhao Q, Xing B. Adsorption of phenanthrene on multilayer graphene as affected by surfactant and exfoliation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:331-9. [PMID: 24328362 DOI: 10.1021/es403873r] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Surfactant mediated exfoliation of multilayer graphene and its effects on phenanthrene adsorption were investigated using a passive dosing technique. In the absence of surfactant (sodium cholate, NaC), multilayer graphene had higher adsorption capacity for phenanthrene than carbon nanotube and graphite due to the higher surface area and micropore volume. The observed desorption hysteresis is likely caused by the formation of closed interstitial spaces through folding and rearrangement of graphene sheets. In the presence of NaC (both 100 and 8000 mg/L), phenanthrene adsorption on graphene was decreased due to the direct competition of NaC molecules on the graphene surface. With the aid of sonication, multilayer graphene sheets were exfoliated by NaC, leading to better dispersion. The degree of dispersion depended on the graphene-NaC ratio in aqueous solution rather than critical micelle concentration of NaC, and the good dispersion occurred after reaching adsorption saturation of NaC molecules on graphene sheets. In addition, exfoliation weakened the competition between phenanthrene and NaC and enhanced the adsorption capacity of graphene for phenanthrene due to exposed new sites. The findings on exfoliation of graphene sheets and related adsorption properties highlight not only the potential applications of multilayer graphene as efficient adsorbent but also its possible environmental risk.
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Affiliation(s)
- Jian Zhao
- Stockbridge School of Agriculture, University of Massachusetts , Amherst, Massachusetts 01003, United States
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36
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Jackson P, Jacobsen NR, Baun A, Birkedal R, Kühnel D, Jensen KA, Vogel U, Wallin H. Bioaccumulation and ecotoxicity of carbon nanotubes. Chem Cent J 2013; 7:154. [PMID: 24034413 PMCID: PMC3848800 DOI: 10.1186/1752-153x-7-154] [Citation(s) in RCA: 135] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Accepted: 09/04/2013] [Indexed: 12/20/2022] Open
Abstract
Carbon nanotubes (CNT) have numerous industrial applications and may be released to the environment. In the aquatic environment, pristine or functionalized CNT have different dispersion behavior, potentially leading to different risks of exposure along the water column. Data included in this review indicate that CNT do not cross biological barriers readily. When internalized, only a minimal fraction of CNT translocate into organism body compartments. The reported CNT toxicity depends on exposure conditions, model organism, CNT-type, dispersion state and concentration. In the ecotoxicological tests, the aquatic organisms were generally found to be more sensitive than terrestrial organisms. Invertebrates were more sensitive than vertebrates. Single-walled CNT were found to be more toxic than double-/multi-walled CNT. Generally, the effect concentrations documented in literature were above current modeled average environmental concentrations. Measurement data are needed for estimation of environmental no-effect concentrations. Future studies with benchmark materials are needed to generate comparable results. Studies have to include better characterization of the starting materials, of the dispersions and of the biological fate, to obtain better knowledge of the exposure/effect relationships.
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Affiliation(s)
- Petra Jackson
- National Research Centre for the Working Environment, Lersø Parkallé 105, Copenhagen Ø, DK-2100, Denmark.
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37
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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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38
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Jing Q, Yi Z, Lin D, Zhu L, Yang K. Enhanced sorption of naphthalene and p-nitrophenol by nano-SiO2 modified with a cationic surfactant. WATER RESEARCH 2013; 47:4006-4012. [PMID: 23561503 DOI: 10.1016/j.watres.2012.09.057] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Revised: 08/08/2012] [Accepted: 09/17/2012] [Indexed: 06/02/2023]
Abstract
In this study, we observed that modification of nano-oxides (e.g., nano-SiO2) with cationic surfactants (e.g., cetyl pyridinium chloride, CPC) could be a potential way to make nano-oxides be superior sorbents with a partition mechanism for the sorptive removal of organic contaminants from wastewater where the coated CPC was an effective organic phase for partitioning. The partitioning of nonpolar naphthalene into coated CPC was induced by hydrophobic effect alone and presenting linear isotherms, while that of polar p-nitrophenol was induced by not only the hydrophobic effect but also the hydrogen-bonding interaction and presenting isotherm nonlinearity. The sorption affinity for naphthalene and p-nitrophenol partitioning into the coated CPC and the configuration of coated CPC remained unchanged although the amounts of coated CPC were increased. Linear relationships were established between the coated CPC amounts and the sorption capacities of naphthalene or p-nitrophenol, which could be used to predict the sorption of organic contaminants on surfactant-modified nano-oxides. In addition, these observed results would be also valuable for estimating the environmental behaviors and risks of nano-SiO2 and organic contaminants because nano-SiO2 would be inevitably coated with ubiquitous surfactants in the environment due to the discharging from the wide domestic and industry applications.
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Affiliation(s)
- Qingfeng Jing
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
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39
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Pan B, Zhang D, Li H, Wu M, Wang Z, Xing B. Increased adsorption of sulfamethoxazole on suspended carbon nanotubes by dissolved humic acid. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:7722-7728. [PMID: 23742687 DOI: 10.1021/es4008933] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Although dissolved organic matter (DOM) could effectively disperse carbon nanotubes (CNTs), sorption characteristics of DOM-suspended CNTs are unclear. In this study, we evaluated the relative contribution to the overall sorption from dissolved humic acid (DHA) coating (decreased sorption) and CNT dispersion (increased sorption). We observed that the sorption coefficients of sulfamethoxazole (SMX) on DHA-suspended CNTs were up to 2 orders of magnitude higher than that on aggregated CNTs. Although the mass percent of suspended CNTs were low (generally less than 1%), their contributions to SMX adsorption were up to 20%. Because DHA and SMX did not interact with each other due to their negative charges, the suspended CNTs may not be completely coated by DHA and they had considerable hydrophobic surface exposed. Importantly, this study provided the first evidence in aqueous phase of the significantly increased surface area of DHA-suspended CNTs relative to the aggregated ones based on (1)H NMR relaxometry measurements. This study emphasizes that in comparison to aggregated CNTs, the suspended ones have amply exposed surface area and thus have greater environmental impacts, such as enhancing the mobility, transport, and possibly exposure of organic contaminants.
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Affiliation(s)
- Bo Pan
- Kunming University of Science & Technology, Kunming, China 650500.
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40
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Yang K, Yi Z, Jing Q, Yue R, Jiang W, Lin D. Sonication-assisted dispersion of carbon nanotubes in aqueous solutions of the anionic surfactant SDBS: The role of sonication energy. ACTA ACUST UNITED AC 2013. [DOI: 10.1007/s11434-013-5697-2] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Sun H, Song Q, Luo P, Wu P, Wu J. Sorption of phenanthrene on single-walled carbon nanotubes modified by DOM: effects of DOM molecular weight and contact time. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2013; 15:307-314. [PMID: 24592448 DOI: 10.1039/c2em30569k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The impacts on the sorption of phenanthrene (PHE) onto single-walled carbon nanotubes (SCNT) by loading of dissolved organic matter (DOM) fractions with different molecular weights (MWs) were studied. Moreover, the influence of contact time on the sorption capacity of DOM-modified SCNT was evaluated for the first time. Preloading of DOM on SCNT for 2 days led to a reduction in PHE sorption and the nonlinearity of the sorption isotherm; however further increasing the contact time between the DOM and SCNT from 2 days to 20 days enhanced the sorption capacity, and the sorption nonlinearity increased also. This is due to the transferring of DOM molecules from the external surface to interstitial channels trapped in SCNT particles, restoring the sorption sites. The loading of DOM fraction with MWs larger than 14000 Da (DOM>14000) brought a stronger suppression of PHE sorption by SCNT compared to smaller ones (DOM<1000 and DOM1000–14000), with the Freundlich nonlinear index n increasing from 0.236 to 1.093 and the Freundlich affinity coefficient log KF decreasing from to 7.34 to 4.57. These are similar to the sorption characteristics of DOM>14000, suggesting a complete coverage of the SCNT by DOM>14000 molecules. Though the loading of DOM fractions with smaller MWs made SCNT more polar, the reduction in PHE sorption on DOM-preloaded SCNT was limited due to their lesser sorbed amount and smaller molecular size.
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42
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Wang Q, Li J, Song Y, Wang X. Facile Synthesis of High-Quality Plasma-Reduced Graphene Oxide with Ultrahigh 4,4′-Dichlorobiphenyl Adsorption Capacity. Chem Asian J 2012; 8:225-31. [DOI: 10.1002/asia.201200782] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Indexed: 11/11/2022]
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43
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Sui K, Li Y, Liu R, Zhang Y, Zhao X, Liang H, Xia Y. Biocomposite fiber of calcium alginate/multi-walled carbon nanotubes with enhanced adsorption properties for ionic dyes. Carbohydr Polym 2012; 90:399-406. [DOI: 10.1016/j.carbpol.2012.05.057] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 05/13/2012] [Accepted: 05/19/2012] [Indexed: 12/28/2022]
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Wu W, Chen W, Lin D, Yang K. Influence of surface oxidation of multiwalled carbon nanotubes on the adsorption affinity and capacity of polar and nonpolar organic compounds in aqueous phase. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:5446-5454. [PMID: 22524230 DOI: 10.1021/es3004848] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Adsorption of organic contaminants on carbon nanotubes (CNTs) is a critical behavior in the environmental application of CNTs as sorbents and in the environmental risk assessment of both organic contaminants and CNTs. Oxidation of CNTs may introduce oxygen-containing groups on CNTs' surface and then alter the adsorption of organic contaminants. In this study, adsorption of polar and nonpolar organic compounds on four multiwalled carbon nanotubes (MWCNTs) containing varied amounts of surface oxygen-containing groups were investigated to examine the influence of CNTs' surface oxidation on adsorption. We observed that surface oxidation of MWCNTs reduced the surface area-normalized adsorption capacity of organic compounds significantly because of the competition of water molecules but did not alter the adsorption affinity. The interactions (i.e., hydrophobic effect, π-π bonds, and hydrogen bonds) and the interaction strength for adsorption of organic molecules on MWCNTs could not be altered by the surface oxidation of MWCNTs and thus were responsible for the unaltered adsorption affinity. In addition, the decrease of surface area-normalized adsorption capacity of the organic compound with more polarity and higher adsorption affinity by surface oxidation was less because of the heterogeneous nature of hydrophilic sites of MWCNTs' surface.
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Affiliation(s)
- Wenhao Wu
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China
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45
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Zhao J, Wang Z, Mashayekhi H, Mayer P, Chefetz B, Xing B. Pulmonary surfactant suppressed phenanthrene adsorption on carbon nanotubes through solubilization and competition as examined by passive dosing technique. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:5369-5377. [PMID: 22519404 DOI: 10.1021/es2044773] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Adsorption of phenanthrene on carbon nanotubes (CNTs) was examined in the presence of pulmonary surfactant (Curosurf) and its main components, dipalmitoyl phosphatidylcholine (DPPC) and bovine serum albumin (BSA). A passive-dosing method based on equilibrium partitioning from a preloaded polymer was successfully employed to measure phenanthrene binding and speciation at controlled freely dissolved concentrations while avoiding phase separation steps. Curosurf, DPPC, and BSA could all linearly solubilize phenanthrene, and phenanthrene solubilization by Curosurf was 4 times higher than individual components (DPPC or BSA). In the presence of Curosurf, DPPC or BSA, adsorption of phenanthrene by multiwalled CNTs (MWCNTs) was suppressed, showing competitive adsorption between pulmonary surfactant (or DPPC, BSA) and phenanthrene. Competitive adsorption between Curosurf and phenanthrene was the strongest. Therefore, when phenanthrene-adsorbed CNTs enter the respiratory tract, phenanthrene can be desorbed due to both solubilization and competition. The bioaccessibility of phenanthrene adsorbed on three MWCNTs in the respiratory tract would be positively related to the size of their outer diameters. Moreover, the contribution of solubilization and competition to desorption of phenanthrene from MWCNTs was successfully separated for the first time. These findings demonstrate the two mechanisms on how pulmonary surfactants can enhance desorption and thus possibly biological absorption of phenanthrene adsorbed on CNTs.
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Affiliation(s)
- Jian Zhao
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
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46
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Oleszczuk P, Xing B. Influence of anionic, cationic and nonionic surfactants on adsorption and desorption of oxytetracycline by ultrasonically treated and non-treated multiwalled carbon nanotubes. CHEMOSPHERE 2011; 85:1312-7. [PMID: 21890168 DOI: 10.1016/j.chemosphere.2011.07.044] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Revised: 07/19/2011] [Accepted: 07/21/2011] [Indexed: 05/14/2023]
Abstract
High adsorption capacity of carbon nanotubes (CNTs) may greatly determine the bioavailability and mobility of organic contaminants. The fate of contaminants adsorbed by CNTs may be substantially influenced by surfactants used both in the synthesis and dispersion of CNTs. The aim of this research was to determine the influence of surfactants (nonionic - TX100, cationic - CTAB and anionic - SDBS) on adsorption and desorption of oxytetracycline (OTC) by multiwalled carbon nanotubes (MWCNTs). The surfactants used had a substantial influence on both adsorption and desorption of OTC. The direction of changes depended clearly on the type of surfactant. In case of anionic SDBS, increased adsorption of OTC by MWCNTs was observed. The presence of TX100 and CTAB decreased the adsorption of OTC by MWCNTs significantly. The increase of OTC adsorption after ultrasonic treatment was observed in case of MWCNTs alone and MWCNTs with SDBS and TX100. However, ultrasonic treatment caused OTC adsorption decrease in the presence of CTAB. The change of pH had also an important effect on OTC adsorption in the presence of surfactants. Depending on the surfactant and pH, an increase or decrease of OTC adsorption was observed. The presence of surfactants increased OTC desorption from MWCNTs significantly as follows: SDBS=CTAB < TX100. The results obtained suggest new potential threats and constitute a basis for further research considering the bioavailability and toxicity of antibiotics in the presence of MWCNTs and surfactants.
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Affiliation(s)
- Patryk Oleszczuk
- Institute of Soil Sciences and Environmental Management, University of Life Sciences, 20-069 Lublin, Poland.
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47
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Cui XY, Jia F, Chen YX, Gan J. Influence of single-walled carbon nanotubes on microbial availability of phenanthrene in sediment. ECOTOXICOLOGY (LONDON, ENGLAND) 2011; 20:1277-85. [PMID: 21656161 DOI: 10.1007/s10646-011-0684-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/08/2011] [Indexed: 05/15/2023]
Abstract
Increasing production and use of single-walled carbon nanotubes (SWCNT) will inevitably lead to release of these nanoparticles to aquatic ecosystems. Similar to black carbon (BC) particles, SWCNT have a high affinity for hydrophobic organic contaminants (HOCs) and therefore the presence of SWCNT in sediment may lead to altered bioavailability of HOCs. We compared SWCNT with biochar and charcoal on their effect on the microbial degradability of 0.05 mg kg(-1) (14)C-phenanthrene (PHE) by Mycobacterium vanbaalenii PYR-1 in two sediments with different organic carbon (OC) contents. When the amendment rate of SWCNT or BC was 1 mg g(-1), PHE mineralization was inhibited much more significantly by SWCNT than by either biochar or charcoal. After 360 h of incubation, the mineralized fraction of PHE in the presence of SWCNT was 59.5% of the non-amended control in the sediment with low OC content, and only 42.4% in the other sediment with a higher OC content. Analysis of the freely dissolved concentration (C (free)) using disposable polydimethylsiloxane (PDMS) fibers showed that SWCNT decreased C (free) by 85-95%, apparently due to preferential sorption of PHE to SWCNT particles that had a much larger specific surface area and pore volume than biochar or charcoal. However, pre-interaction of SWCNT with dissolved organic matter (peptone, tannic acid, and humic acid) led to attachment of polar functional groups and reduced surface area on SWCNT, resulting in decreased PHE sorption and an alleviated effect on PHE biodegradation in the order of peptone > tannic acid > humic acid.
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Affiliation(s)
- X Y Cui
- Department of Environmental Sciences, University of California, Riverside, Riverside, CA 92521, USA.
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48
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Wang Z, Zhao J, Song L, Mashayekhi H, Chefetz B, Xing B. Adsorption and desorption of phenanthrene on carbon nanotubes in simulated gastrointestinal fluids. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:6018-6024. [PMID: 21662386 DOI: 10.1021/es200790x] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Adsorption of phenanthrene on carbon nanotubes (CNTs) and bioaccessibility of adsorbed phenanthrene were studied in simulated gastrointestinal fluids. Adsorption of phenanthrene on CNTs was suppressed in pepsin (800 mg/L) solution (gastric) and bile salt (500 and 5000 mg/L) fluids (intestinal). In addition to competitive sorption, pepsin and high-concentration bile salt (5000 mg/L, above critical micelle concentration) solubilized phenanthrene (3 and 30 times of the water solubility, respectively), thus substantially reduced phenanthrene adsorption on CNTs. Pepsin and bile salts also increased the rapidly desorbing phenanthrene fraction from CNTs. The rapidly desorbing phase lasted less than 1 h for all CNTs. Further, 43-69% of phenanthrene was released from CNTs after desorption in the simulated gastric and intestinal fluid at low bile salt concentration while 53-86% was released in the gastric and intestinal fluid at high bile salt concentration. These findings suggest that the release of residual hydrophobic organic compounds from CNTs could be enhanced by biomolecules such as pepsin and bile salts in the digestive tract, thus increasing the bioaccessibility of adsorbed phenanthrene and possibly the overall toxicity of phenanthrene associated CNTs.
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Affiliation(s)
- Zhenyu Wang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
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49
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Wang F, Yao J, Sun K, Xing B. Adsorption of dialkyl phthalate esters on carbon nanotubes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:6985-6991. [PMID: 20715866 DOI: 10.1021/es101326j] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Dialkyl phthalate esters (DPEs), with endocrine disrupting functions, are widely used and categorized as priority pollutants. Carbon nanotubes (CNTs) as strong adsorbents could influence the fate, transport, and bioavailability of DPEs in the environment. Understanding adsorptive interactions between CNTs and DPEs is critical to the environmental applications of CNTs. Adsorption of DPEs by one type of single-walled CNTs (SWCNT) and three multiwalled CNTs (MWCNT) was evaluated. For a given CNT, the adsorptive affinity correlated well with hydrophobicity of DPEs with an order of dimethyl phthalate (DMP) < diethyl phthalate (DEP) < dibutyl phthalate (DBP). The normalized adsorption coefficient (K/K(HW)) of DPEs indicates that π-π electron-donor-acceptor (EDA) interaction was also important for adsorption of DPEs (π-acceptor) on CNTs (π-donor). A π-π charge-transfer band of EDA complexes (mixture of pyrene (PYR) as π-donor and DPEs as π-acceptor) showed their interaction strength in the order of DMP-PYR > DEP-PYR > DBP-PYR. Calculated monolayer adsorption capacities (log Q) were bigger (for DMP and DEP) than or approximately equal to (for DBP) the estimated adsorption capacities (log Q(0)), implying that the DPEs were adsorbed on the surface area of CNTs. For a given DPE, the adsorptive capacities decreased with the increasing outer diameters of CNTs in the order of SWCNT > MWCNT10 > MWCNT20 > MWCNT40.
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Affiliation(s)
- Fei Wang
- Civil & Environment Engineering School, University of Science & Technology Beijing, 100083 Beijing, China
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50
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Yang K, Xing B. Adsorption of Organic Compounds by Carbon Nanomaterials in Aqueous Phase: Polanyi Theory and Its Application. Chem Rev 2010; 110:5989-6008. [DOI: 10.1021/cr100059s] [Citation(s) in RCA: 649] [Impact Index Per Article: 46.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Kun Yang
- Department of Environmental Science, Zhejiang University, Hangzhou 310028, China, and Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, Massachusetts 01003
| | - Baoshan Xing
- Department of Environmental Science, Zhejiang University, Hangzhou 310028, China, and Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, Massachusetts 01003
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