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Malesys V, Andrieux-Ledier A, Lavenus P, Simon L. Building a cm 2scale CVD graphene-based gas sensor: modelling the kinetic with a three-site adsorption/desorption Langmuir model. Nanotechnology 2024; 35:285501. [PMID: 38579693 DOI: 10.1088/1361-6528/ad3b02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 04/05/2024] [Indexed: 04/07/2024]
Abstract
In this article, we aim to develop and study a highly sensitive and selective cm2scale graphene-based gas sensor. We present the technology used to fabricate sensors which integrate monolayer chemical vapour deposition graphene: photolithography and transfer of layers. Characterization techniques (optical microscopy, AFM, micro-Raman spectroscopy, transport electrical measurements) ensure a diagnosis of graphene ribbons and allow good reproducibility of technological processes. We present the results of gas characterizations after a 200 ppm NO2exposure. We propose a novel approach for the modelling of the sensor response with a three-site adsorption/desorption Langmuir model. This innovative way of modelling the sensor response should provide a better understanding of the sensor's kinetic and help to overcome the long response time observed with graphene gas sensors.
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Affiliation(s)
- V Malesys
- Institut de Sciences des Matériaux de Mulhouse, CNRS-UMR 7361, Université de Haute Alsace, Mulhouse, France
| | | | - P Lavenus
- DPHY, ONERA, Université Paris Saclay, Châtillon, France
| | - L Simon
- Institut de Sciences des Matériaux de Mulhouse, CNRS-UMR 7361, Université de Haute Alsace, Mulhouse, France
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Jayan A, Nizam A, Nagella P, Veerappa Lakshmaiah V. Acidified groundnut cake for enhanced bio adsorption of anionic textile dye Reactive Red 195. Int J Phytoremediation 2024:1-12. [PMID: 38279798 DOI: 10.1080/15226514.2024.2305271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2024]
Abstract
This study focuses on the improvement of bioremediation of textile dye Reactive Red 195 using agro-industrial waste, groundnut oil cake (GNOC) obtained after oil-pressing. The treatment of GNOC with 1 N H2SO4 had resulted in physiochemical changes on the insoluble porous adsorbent, which improved their adsorption efficiency. The dye removal efficiency increased from 55% to 94% on acidification of GNOC. The raw groundnut oil cake (RGNOC) and acid-treated groundnut oil cake (AGNOC) were characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction, and zeta potential. The rate and efficiency of dye adsorption were examined using adsorption kinetics and isotherm models. The results confirm that acid-treated GNOC eliminates impurities, alter the surface functional groups, and significantly increase porous surface areas of RGNOC. The investigation of key factors such as contact time, initial concentration of dye, static/agitation impact, particle size, and adsorbent dose had significantly influenced adsorption capacity of GNOC. Adsorption of dye fits best into the Langmuir model and equilibrium data of dye on AGNOC was explained by psuedo-second-order reaction with maximum adsorption capacity of 12.65 mg/g. This emphasis AGNOC has a very excellent potential to remove the textile dye Reactive Red dye from industrial effluent.
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Affiliation(s)
- Arpita Jayan
- Department of Life Sciences, CHRIST (Deemed to be University), Bangalore, India
| | - Aatika Nizam
- Deparment of Chemistry, CHRIST (Deemed to be University), Bangalore, India
| | - Praveen Nagella
- Department of Life Sciences, CHRIST (Deemed to be University), Bangalore, India
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Wang M, Zhang F, Debrah AA, Khan J, Hou H, Yuan Q, Du Z. Selective extraction of phospholipids from human milk using glass fabric modified with zirconium-based metal organic framework. J Chromatogr A 2023; 1710:464435. [PMID: 37820461 DOI: 10.1016/j.chroma.2023.464435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 09/30/2023] [Accepted: 10/05/2023] [Indexed: 10/13/2023]
Abstract
Phospholipids (PLs) are important and complex trace lipids in milk, which have positive effects on the infants' nervous and immune system development. Herein, a new method for selective extraction of PLs using glass fabric @ MOF-808 was proposed. Based on Lewis acid-base interaction, MOF-808 containing abundant Zr-OH groups was selected as the adsorption body, and glass fabric was used as a substrate to make the adsorbent easy to remove and reuse. The influencing factors such as loading solution, extraction time, eluent and elution time were further investigated. The adsorbent showed high adsorption capacity (3.31-6.54 mg/g for PLs) and good reusability (reused at least five times). The method showed low detection limits (1.61 μg/L - 10.24 μg/L) and quantification limits (5.24 μg/L-51.21 μg/L) for eight classes of PLs. The analysis of PLs in human milk at different lactation stages by ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry could obtain up to 206 PLs, indicating that the method has extremely high extraction and anti-interference capabilities. This work is the first time to introduce MOF materials to selectively extract PLs and use glass fabric as a substrate for MOF-808, which has the advantages of easy recovery and high sensitivity. It provides technical support for the discovery of more PL species and has potential applications in phospholipidomics.
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Affiliation(s)
- Mengyu Wang
- College of Chemistry, Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China
| | - Fengxia Zhang
- Corporate Laboratory, Junlebao Dairy Group, Shijiazhuang 050221, China
| | - Augustine Atta Debrah
- College of Chemistry, Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jehangir Khan
- College of Chemistry, Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China
| | - Haiyue Hou
- College of Chemistry, Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China
| | - Qingbin Yuan
- Corporate Laboratory, Junlebao Dairy Group, Shijiazhuang 050221, China.
| | - Zhenxia Du
- College of Chemistry, Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China.
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Zhu X, Chen Y, Xu C, Cook PLM, Odum B, Gan M, Zhang C. The influence of turbulence on sediment phosphorus sorption. Ecotoxicol Environ Saf 2023; 258:114955. [PMID: 37121076 DOI: 10.1016/j.ecoenv.2023.114955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 04/14/2023] [Accepted: 04/23/2023] [Indexed: 05/22/2023]
Abstract
The effect of mean flow velocity on phosphorus (P) partitioning between water and sediment has received much attention in recent decades. However, the impact of turbulence on the efficiency and capability of sediment adsorbing and desorbing dissolved inorganic phosphorus (DIP) is still unclear. A series of contrasting experiments on the sediment sorption and desorption of DIP with the flow turbulence kinetic energy (TKE) ranging from 1.95 to 2.93 pa have been conducted. It was found that the adsorbed P onto unit mass of sediment increases with the increase in TKE. It is because an increase in TKE results in a rise in the effective adsorption capacity of sediment (bm) by 20-30% during the adsorption process. The bm shows the maximum rise from 0.18 to 0.25 mg/g when TKE increases from 1.95 to 2.93 pa with a fixed sediment concentration of 0.5 g/L. To account for the direct effect of TKE on P adsorption, the Langmuir model is modified by introducing a newly defined coefficient (fA-TKE). The fA-TKE shows a good linear relationship with TKE. Comparison between the modified model and the classic model shows that the amount of adsorbed P could be overestimated by over 50% if the direct effect of turbulence intensity is ignored. The experimental data show that the increase in TKE also enhances the desorption process, with the degree of P desorption (Ddes) increased by 44%. The relation between Ddes and TKE can be well represented using a logarithmic function to quantify the direct effect of turbulence intensity on desorption of P.
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Affiliation(s)
- Xian Zhu
- State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Hohai University, Nanjing 210098, PR China; College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, PR China
| | - Yongping Chen
- State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Hohai University, Nanjing 210098, PR China; College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, PR China.
| | - Chunyang Xu
- State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Hohai University, Nanjing 210098, PR China; College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, PR China
| | - Perran L M Cook
- School of Chemistry, Monash University, Clayton, VIC 3800, Australia
| | - Bismark Odum
- State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Hohai University, Nanjing 210098, PR China; College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, PR China
| | - Min Gan
- Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China
| | - Changkuan Zhang
- State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Hohai University, Nanjing 210098, PR China; College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, PR China
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Sobolev NA, Larionov KS, Mryasova DS, Khreptugova AN, Volikov AB, Konstantinov AI, Volkov DS, Perminova IV. Yedoma Permafrost Releases Organic Matter with Lesser Affinity for Cu 2+ and Ni 2+ as Compared to Peat from the Non-Permafrost Area: Risk of Rising Toxicity of Potentially Toxic Elements in the Arctic Ocean. Toxics 2023; 11:483. [PMID: 37368583 DOI: 10.3390/toxics11060483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 06/29/2023]
Abstract
Pollution of the Arctic Ocean by potentially toxic elements (PTEs) is a current environmental problem. Humic acids (HAs) play an important role in the regulation of PTE mobility in soil and water. The permafrost thaw releases ancient organic matter (OM) with a specific molecular composition into the Arctic watersheds. This could affect the mobility of PTEs in the region. In our study, we isolated HAs from two types of permafrost deposits: the Yedoma ice complex, which contains pristine buried OM, and the alas formed in the course of multiple thaw-refreezing cycles with the most altered OM. We also used peat from the non-permafrost region as the recent environmental endmember for the evolution of Arctic OM. The HAs were characterized using 13C NMR and elemental analysis. Adsorption experiments were conducted to assess the affinity of HAs for binding Cu2+ and Ni2+. It was found that Yedoma HAs were enriched with aliphatic and N-containing structures as compared to the much more aromatic and oxidized alas and peat HAs. The adsorption experiments have revealed that the peat and alas HAs have a higher affinity for binding both ions as compared to the Yedoma HAs. The obtained data suggest that a substantial release of the OM from the Yedoma deposits due to a rapid thaw of the permafrost might increase the mobility of PTEs and their toxicity in the Arctic Ocean because of much lesser "neutralization potential".
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Affiliation(s)
- Nikita A Sobolev
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russia
| | - Konstantin S Larionov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russia
| | - Darya S Mryasova
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russia
| | - Anna N Khreptugova
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russia
| | - Alexander B Volikov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russia
| | - Andrey I Konstantinov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russia
| | - Dmitry S Volkov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russia
- Department of Chemistry and Physical Chemistry of Soils, Federal Research Centre, V.V. Dokuchaev Soil Science Institute, Pyzhevsky per., 7/2, 119017 Moscow, Russia
| | - Irina V Perminova
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russia
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Gheimasi MHM, Sadr MK, Lorestani B, Cheraghi M, Emadzadeh D, Abdollahi S. Efficiency evaluation of titanium oxide nanocomposite membrane in adsorption of chromium from oil effluents. Environ Monit Assess 2023; 195:668. [PMID: 37178265 DOI: 10.1007/s10661-023-11314-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023]
Abstract
Reverse osmosis and nanofiltration (NF) are the essential physical separation technologies used to remove contaminants from liquid streams. A hybrid of nanofiltration and forward osmosis (FO) was used to increase the removal efficiency of heavy metals in synthesized oil effluents. Thin-film nanocomposite (TFN) membranes were synthesized by applying surface polymerization on a polysulfone substrate to use in the forward osmosis process. The impact of different membrane fabrication conditions such as time, temperature, and pressure on effluent flux, the effect of different concentrations of the heavy metal solution on adsorption rate and sedimentation rate, the impact of TiO2 nanoparticles on the performance and structure of forward osmosis membranes were investigated. The morphology, composition, and properties of TiO2 nanocomposites made by the infrared spectrometer and X-ray diffraction (XRD) were studied. Kinetic modeling and Langmuir, Freundlich, and Tamkin relationships were used to draw adsorption isotherms and evaluate adsorption equilibrium data. The results indicated that pressure and temperature directly affect water outlet flux, and time affects it indirectly. Evaluating the isothermal relationships revealed that chromium adsorption from the TFN 0.05 ppm membrane and thin-film composite (TFC) membrane follows the Langmuir model with correlation coefficients of 0.996 and 0.995, respectively. The significant removal of heavy metals and the acceptable amount of water flux demonstrated the appropriate potential of the titanium oxide nanocomposite membrane, which can be used as an effective adsorbent to remove chromium from aqueous solutions.
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Affiliation(s)
| | - Maryam Kiani Sadr
- Department of Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran.
| | - Bahareh Lorestani
- Department of Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
| | - Mehrdad Cheraghi
- Department of Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
| | - Daryoush Emadzadeh
- Department of Chemical Engineering, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran
| | - Sedighe Abdollahi
- Department of Environmental Science and Engineering, Faculty of Natural Resources and Environment, Malayer University, Malayer, Iran
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Ahsan H, Shahid M, Imran M, Mahmood F, Siddique MH, Ali HM, Niazi MB, Hussain S, Shahbaz M, Ayyub M, Shahzad T. Photocatalysis and adsorption kinetics of azo dyes by nanoparticles of nickel oxide and copper oxide and their nanocomposite in an aqueous medium. PeerJ 2022; 10:e14358. [PMID: 36405015 PMCID: PMC9671035 DOI: 10.7717/peerj.14358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 10/18/2022] [Indexed: 11/16/2022] Open
Abstract
Background Azo dyes are recalcitrant organic pollutants present in textile industry effluents. Conventional treatment methods to remove them come with a range of disadvantages. Nanoparticles and their nanocomposites offer more efficient, less expensive and easy to handle wastewater treatment alternative. Methods In this study, nanoparticles of nickel oxide (NiO-NPs), copper oxide (CuO-NPs) and their nanocomposite (NiO/CuO-NC) were synthesized using co-precipitation method. The functional groups present on the surface of synthesized nanomaterials were verified using Fourier-transform infrared spectroscopy (FTIR). Surface morphology was assessed using scanning electron microscopy (SEM) whereas purity, shape and size of the crystallite were determined using X-ray diffraction (XRD) technique. The potential of these nanomaterials to degrade three dyes i.e., Reactive Red-2 (RR-2), Reactive Black-5 (RB-5) and Orange II sodium salt (OII) azo dyes, was determined in an aqueous medium under visible light (photocatalysis). The photodegradation effectiveness of all nanomaterials was evaluated under different factors like nanomaterial dose (0.02-0.1 g 10 mL-1), concentration of dyes (20-100 mg L-1), and irradiation time (60-120 min). They were also assessed for their potential to adsorb RR-2 and OII dyes. Results Results revealed that at optimum concentration (60 mgL-1) of RR-2, RB-5, and OII dyes, NiO-NPs degraded 90, 82 and 83%, CuO-NPs degraded 49, 34, and 44%, whereas the nanocomposite NiO/CuO-NC degraded 92, 93, and 96% of the said dyes respectively. The nanomaterials were categorized as the efficient degraders of the dyes in the order: NiO/CuO-NC > NiO-NPs > CuO-NPs. The highest degradation potential shown by the nanocomposite was attributed to its large surface area, small particles size, and quick reactions which were proved by advance analytical techniques. The equilibrium and kinetic adsorption of RR-2 and OII on NiO-NPs, CuO-NPs, and NiO/CuO-NC were well explained with Langmuir and Pseudo second order model, respectively (R2 ≥ 0.96). The maximum RR-2 adsorption (103 mg/g) was obtained with NiO/CuO-NC. It is concluded that nanocomposites are more efficient and promising for the dyes degradation from industrial wastewater as compared with dyes adsorption onto individual NPs. Thus, the nanocomposite NiO/CuO-NC can be an excellent candidate for photodegradation as well as the adsorption of the dyes in aqueous media.
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Affiliation(s)
- Hajra Ahsan
- Department of Environmental Sciences, Government College University, Faisalabad, Pakistan
| | - Muhammad Shahid
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, Pakistan
| | - Muhammad Imran
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari-Campus, Vehari, Pakistan
| | - Faisal Mahmood
- Department of Environmental Sciences, Government College University, Faisalabad, Pakistan
| | | | - Hayssam M. Ali
- Botany and Microbiology Department, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Muhammad B.K. Niazi
- School of Chemical and Materials Engineering, National University of Sciences & Technology, Islamabad, Pakistan
| | - Sabir Hussain
- Department of Environmental Sciences, Government College University, Faisalabad, Pakistan
| | - Muhammad Shahbaz
- Centre for Environmental and Climate Science, Lund University, Lund, Sweden
| | - Mudassar Ayyub
- Department of Environmental Sciences, Government College University, Faisalabad, Pakistan
| | - Tanvir Shahzad
- Department of Environmental Sciences, Government College University, Faisalabad, Pakistan
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Bazan-Wozniak A, Cielecka-Piontek J, Nosal-Wiercińska A, Pietrzak R. Activation of Waste Materials with Carbon(IV) Oxide as an Effective Method of Obtaining Biochars of Attractive Sorption Properties towards Liquid and Gas Pollutants. Materials (Basel) 2022; 15:8000. [PMID: 36431484 PMCID: PMC9697497 DOI: 10.3390/ma15228000] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/03/2022] [Accepted: 11/09/2022] [Indexed: 06/16/2023]
Abstract
Biochars that are the subjects of this report have been obtained from the residue of supercritical extraction of common nettle seeds with CO2. The residue was subjected to direct activation with carbon(IV) oxide as an activator. The obtained biochars were found to have a specific surface area inthe range of 888-1024 m2/g and a basic surface. They were used for the adsorption of a liquid organic pollutant (methylene blue) and a gas inorganic pollutant (NO2). As follows from the test results, the biochars were able to adsorb 150-239 mg of the dye. The Langmuir model was found to better describe the adsorption experimental data, while the kinetics of the process was better described by the pseudo-second-order model. From the thermodynamic analysis, it was inferred that the adsorption of methylene blue from a water solution was an endothermic and spontaneous reaction. It was established that elevated temperature of activation and the presence of air stream during adsorption had a positive impact on the adsorption of NO2 by the biochars studied. The greatest sorption capacity of the biochars towards NO2 was 59.1 mg/g.
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Affiliation(s)
- Aleksandra Bazan-Wozniak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland
| | - Judyta Cielecka-Piontek
- Department of Pharmacognosy, Poznan University of Medical Sciences, Rokietnicka 3, 60-806 Poznan, Poland
| | - Agnieszka Nosal-Wiercińska
- Faculty of Chemistry, Maria Curie-Sklodowska University in Lublin, Maria Curie-Sklodowska 3, 20-031 Lublin, Poland
| | - Robert Pietrzak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland
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Fallatah AM, Shah HUR, Ahmad K, Ashfaq M, Rauf A, Muneer M, Ibrahim MM, El-Bahy ZM, Shahzad A, Babras A. Rational synthesis and characterization of highly water stable MOF@GO composite for efficient removal of mercury (Hg 2+) from water. Heliyon 2022; 8:e10936. [PMID: 36276714 DOI: 10.1016/j.heliyon.2022.e10936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 07/25/2022] [Accepted: 09/29/2022] [Indexed: 11/23/2022] Open
Abstract
The present study is aimed at adsorptive removal of Mercury (Hg2+) using highly functionalized nanomaterials based on Graphene Oxide Zeolitic Imidazolate Framework composite (ZIF-67@GO). Solvothermal methodology was used to synthesize ZIF-67@GO composite. Synthesized compounds were confirmed by FTIR, SEM, PXRD and EDX analysis. The as-prepared ZIF-67@GO was tested as efficient adsorbent for effective removal of Mercury (Hg2+) from aquatic environment. The atomic adsorption spectrophotometer was used to monitor the process of adsorption of Hg+2 on ZIF-67@GO. From the adsorption data, the maximum removal efficiency achieved was 91.1% using 10 mg amount of composite for 50 mL using 20 ppm Mercury (Hg2+) solution. Different parameters like pH, contact time, concentration, adsorption kinetics and isotherm were also examined to explore adsorption process. Adsorption data fitted well for Freundlich Model having R2 value of 0.9925 than Langmuir Isotherm with R2 value of 0.9238. Kinetics were rapid and excellently described via 2nd order model with R2 = 0.99946 than 1st order model with R2 value of 0.8836. Freundlich and pseudo 2nd order models validated that multilayer chemisorption occurs during adsorption process due to the presence of highly functionalized sites on ZIF-67@GO composite. The synthesized composite material has shown excellent reusability. Thus, water stable ZIF-67@GO composites can efficiently be used for Mercury (Hg2+) confiscation from water.
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Ramachandran G, Chackaravarthi G, Rajivgandhi GN, Quero F, Maruthupandy M, Alharbi NS, Kadaikunnan S, Khaled JM, Li WJ. Biosorption and adsorption isotherm of chromium (VI) ions in aqueous solution using soil bacteria Bacillus amyloliquefaciens. Environ Res 2022; 212:113310. [PMID: 35472466 DOI: 10.1016/j.envres.2022.113310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 04/08/2022] [Accepted: 04/11/2022] [Indexed: 06/14/2023]
Abstract
This study looked at the development of effective biosorbents to recover the most toxic elements from industrial water. B. amyloliquefaciens was isolated from marine soils showing extreme resistance to Chromium (Cr(VI)) ions. During the 60 min of contact time, 79.90% Cr(VI) was adsorbed from the aqueous solution. The impact of important factors such as biomass concentration, pH of the medium, and initial metal ions concentration on biosorption rate was also examined. The desorption study indicated that 1 M HCl (91.24%) was superior to 0.5 M HCl (74.81%), 1 M NaOH (64.96%), and distilled water (3.66%). Based on the Langmuir model, the maximum adsorption capacity of the bio-absorbent was determined to be 48.44 mg/g. The absorption mechanism was identified as monolayer, and 1/n from the Freundlich model falls within 1, thus indicating favorable adsorption. Based on the findings of the present study, the soil bacterium B. amyloliquefaciens was found to be the best alternative and could be used to develop strategies for managing existing environmental pollution through biosorption.
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Affiliation(s)
- Govindan Ramachandran
- Department of Marine Science, Bharathidasan University, Tiruchirappalli- 620024, Tamil Nadu, India
| | | | - Govindan Nadar Rajivgandhi
- Department of Marine Science, Bharathidasan University, Tiruchirappalli- 620024, Tamil Nadu, India; State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China.
| | - Franck Quero
- Laboratorio de Nanocelulosa y Biomateriales, Departamento de Ingeniería Química, Biotecnología y Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Avenida Beauchef 851, Santiago, 8370456, Chile
| | - Muthuchamy Maruthupandy
- Laboratorio de Nanocelulosa y Biomateriales, Departamento de Ingeniería Química, Biotecnología y Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Avenida Beauchef 851, Santiago, 8370456, Chile; Lab of Toxicology, Department of Health Sciences, The Graduate School of Dong-A University, 37, Nakdong-Dearo 550 Beon-Gil, Saha-Gu Busan, 49315, South Korea
| | - Naiyf S Alharbi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Shine Kadaikunnan
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Jamal M Khaled
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Wen-Jun Li
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, PR China; State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, PR China
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Zhou X, Yu X, Hao J, Liu H. Comments on the calculation of the standard equilibrium constant using the Langmuir model in Journal of Hazardous Materials 422 (2022) 126863. J Hazard Mater 2022; 429:128407. [PMID: 35236028 DOI: 10.1016/j.jhazmat.2022.128407] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 01/27/2022] [Accepted: 01/29/2022] [Indexed: 06/14/2023]
Abstract
The calculation of equilibrium constant from the Langmuir model is widely used in the literature. However, the dimensional problem of the equilibrium constant has often been ignored. For example, a recent publication on the strong properties of the new adsorbent for tetracycline. Nevertheless, this used an improper calculation of the standard equilibrium constant, confusing solute and solution. This creates dimension for K0 obtained from Eq. (13). Unfortunately, K0 should be dimensionless. In this comment, the origin and background of this kind of error is analyzed and the method for correcting the error is presented. Specifically, we establish a clear relationship between the Langmuir constant (KL) and the standard equilibrium constant (K0). We hope this comment clarifies the essence of calculating the standard equilibrium constant by using the Langmuir model, so others avoid the propagation of this kind of error.
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Affiliation(s)
- Xueyong Zhou
- School of Life Science, Shanxi Normal University, Taiyuan 030000, Shanxi, China.
| | - Xin Yu
- School of Life Science, Shanxi Normal University, Taiyuan 030000, Shanxi, China
| | - Jianchao Hao
- College of Agronomy & Resources and Environment, Tianjin Agricultural University, Tianjin 300384, China
| | - Huifen Liu
- College of Agronomy & Resources and Environment, Tianjin Agricultural University, Tianjin 300384, China
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12
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Rao S, A S S, Jayaprakash GK, Swamy MM, K S, Kumar D. Plant seed extract assisted, eco-synthesized C-ZnO nanoparticles: Characterization, Chromium (VI) ion adsorption and kinetic studies. LUMINESCENCE 2022. [PMID: 35166440 DOI: 10.1002/bio.4213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 01/20/2022] [Accepted: 02/11/2022] [Indexed: 11/09/2022]
Abstract
This report attempts to elucidate the potential of plant seed extract assisted synthesis of Graphite based zinc oxide nanoparticles (C-ZnO NPs) towards removal of chromium (VI) ions from the water samples. The Graphene-zinc oxide composites were characterised using TGA, XRD, FTIR and SEM. The C-ZnO nanocomposites have found to remove chromium from the sample through adsorption process. The sensitivity of chromium removal through adsorption is found to be in the range of 40-240 mg. The adsorption behaviour was found to be fitting with Langmuir isotherm model and the adsorption reaction follows pseudo second order kinetics.
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Affiliation(s)
- Srilatha Rao
- Department of Chemistry, Nitte Meenakshi Institute of Technology, Yelahanka, Bangalore, Karnataka, India
| | - Sowmyashree A S
- Department of Chemistry, Nitte Meenakshi Institute of Technology, Yelahanka, Bangalore, Karnataka, India
| | | | - M Mahadeva Swamy
- PG Department of Chemistry, JSS College of Arts, Commerce and Science, Mysuru, Karnataka, India
| | - Swamynathan K
- Department of Chemistry, Nitte Meenakshi Institute of Technology, Yelahanka, Bangalore, Karnataka, India
| | - Deepak Kumar
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh, India
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13
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Bauer TV, Pinskii DL, Minkina TM, Shuvaeva VA, Soldatov AV, Mandzhieva SS, Tsitsuashvili VS, Nevidomskaya DG, Semenkov IN. Application of XAFS and XRD methods for describing the copper and zinc adsorption characteristics in hydromorphic soils. Environ Geochem Health 2022; 44:335-347. [PMID: 33180207 DOI: 10.1007/s10653-020-00773-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 10/30/2020] [Indexed: 06/11/2023]
Abstract
Modeling metal sorption in soils is of great importance to predict the fate of heavy metals and to assess the actual risk driven from pollution. The present study focuses on adsorption of HM ions on two types of hydromorphic soils, including calcaric fluvisols loamic and calcaric fluvic arenosols. The individual and competitive adsorption behaviors of Cu and Zn on soils and soil constituents are evaluated comprehensively. It is established that the sorption processes were best described with the Langmuir model. The results suggest that the calcaric fluvic arenosols are more vulnerable to heavy metal input compared to fluvisols loamic. In all cases, Cu had a higher range of values of the adsorption process parameters relative to Zn. The Zn is likely to be the most critical environmental factor in such soils since it exhibited a decreased sorption under competitive conditions. The retention mechanisms of HM in hydromorphic soils are considered. Based on theoretical calculations of ion activity in soil solutions using solubility diagrams of Cu and Zn compounds, the possibility of precipitation of Cu hydroxide and Zn carbonate in the studied soils is shown. Direct physical methods of nondestructive testing (XAFS and XRD) are applied to experimentally prove the formation of these HM compounds on the surface of montmorillonite, the dominant mineral in hydromorphic soils, and calcite. Thus, the combination of both physicochemical methods and direct physical methods can provide a large amount of real information about the mechanisms of HM retain with solid phases.
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Affiliation(s)
- Tatiana V Bauer
- Federal Research Centre, The Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, 344006, Russian Federation
| | - David L Pinskii
- Institute of Physicochemical and Biological Problems of Soil Science, Russian Academy of Sciences, Institutskaya str, 2, Pushchino, Pushchino, 142290, Russian Federation.
| | - Tatiana M Minkina
- Southern Federal University, Rostov-on-Don, 344006, Russian Federation
| | | | | | | | | | | | - Ivan N Semenkov
- Lomonosov Moscow State University, Moscow, 119991, Russian Federation
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14
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Hussain Z, Chang N, Sun J, Xiang S, Ayaz T, Zhang H, Wang H. Modification of coal fly ash and its use as low-cost adsorbent for the removal of directive, acid and reactive dyes. J Hazard Mater 2022; 422:126778. [PMID: 34391971 DOI: 10.1016/j.jhazmat.2021.126778] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 07/14/2021] [Accepted: 07/27/2021] [Indexed: 06/13/2023]
Abstract
Directive, acid and reactive dyes are the carcinogenic dyes which have complex structures and difficult to remove from the industrial wastewater. In this study, coal fly ash (CFA) was modified with HCl and NaOH solution and used for the removal of direct fast scarlet 4BS, direct sky blue 5B, acid navy blue R, and reactive turquoise blue KN-G dyes. Laboratory experiments were carried out to analyze the performance of modified coal fly ash (MCFA) to check the removal efficiency and adsorption capacity of dyes. The maximum removal efficiency of direct fast scarlet 4BS and direct sky blue 5B were recorded 96.03% and 93.820%, respectively using 0.05 g adsorbent dosage at 100 mg/L initial concentration. The results of MCFA were compared with carbon black, chitosan, starch, zeolite and unmodified coal fly ash (UMCFA) at lower dosage 0.05 g and higher dosage 0.4 g. Adsorption isotherm were analyzed by Langmuir and Freundlich model by different dyes concentrations, the result stated that Freundlich and Langmuir model (±0.9918, ±0.9974) was fitted by chemisorption and physisorption methods for all four dyes. Adsorption kinetic were also determined by Pseudo-first-order and Pseudo-second-order at different contact times with dye molecules and adsorbent active sites, and the results showed that the adsorption behaviors of all four dyes were described better by pseudo-second-order kinetics than pseudo-first-order kinetics. Recommended dosage of modified fly ash is between 10 ‱ to 20 ‱ for simulated textile industrial waste water and regeneration temperature is 300 ℃.
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Affiliation(s)
- Zawar Hussain
- School of Material Science and Engineering, Tiangong University, No. 399 Binshui West Road, Xiqing District, Tianjin 300387, PR China
| | - Na Chang
- School of Textile Science and Engineering, Tiangong University, No. 399 Binshui West Road, Xiqing District, Tianjin 300387, PR China
| | - Jingqiu Sun
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 10085, PR China
| | - Simeng Xiang
- School of Textile Science and Engineering, Tiangong University, No. 399 Binshui West Road, Xiqing District, Tianjin 300387, PR China
| | - Tehreem Ayaz
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Hao Zhang
- School of Textile Science and Engineering, Tiangong University, No. 399 Binshui West Road, Xiqing District, Tianjin 300387, PR China
| | - Haitao Wang
- School of Material Science and Engineering, Tiangong University, No. 399 Binshui West Road, Xiqing District, Tianjin 300387, PR China.
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Wang P, Cao J, Zhang Y, Sun Q. Controllable Preparation of Cubic Zeolite A and Application of Langmuir Model in Carbon Dioxide Adsorption. Nanomaterials (Basel) 2021; 11:3375. [PMID: 34947724 DOI: 10.3390/nano11123375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 11/30/2021] [Accepted: 12/08/2021] [Indexed: 12/02/2022]
Abstract
A large amount of remaining fly ash has been piled up or landfilled, which not only a waste of land resources but also results in a series of environmental problems. Therefore, using fly ash to produce high value-added products is a win-win development orientation between human beings and nature. In this study, zeolite A is successfully synthesized using a hydrothermal method using fly ash. Additionally, it is at 1.0 mol·L−1 of the alkali concentration that the crystallinity of zeolite A reaches the maximum value, about 96.6%. FTIR research shows that the main secondary structural unit D4R vibration band of zeolite A appears at 555 cm−1. The results of the SEM study indicate the structure of zeolite A is cubic. The TEM results show that the crystal structure of the zeolite A belongs to the body-centered cubic structure. Meanwhile, the positively charged sodium ions cooperate with the silicon oxygen tetrahedron and the aluminum oxygen tetrahedron to form the zeolite A skeleton. Carbon dioxide adsorption equilibrium study shows that the maximum adsorption capacity of zeolite A of 46.5 mL·g−1 is significantly higher than the maximum adsorption capacity of commercial-grade zeolite 4A of 39.3 mL·g−1. In addition, the application of the Langmuir model in the adsorption of carbon dioxide by commercial-grade zeolite 4A and zeolite A is studied, which not only extends the application of zeolite A, but can be further extended to other zeolite materials as well. Meanwhile, the adsorption process belongs to the Langmuir model, which is a single layer adsorption on an ideal surface.
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16
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Song Y, Gotoh T, Nakai S. Synthesis of Oxidant Functionalised Cationic Polymer Hydrogel for Enhanced Removal of Arsenic (III). Gels 2021; 7:gels7040197. [PMID: 34842691 PMCID: PMC8628796 DOI: 10.3390/gels7040197] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/29/2021] [Accepted: 10/31/2021] [Indexed: 11/16/2022] Open
Abstract
A cationic polymer gel (N-[3-(dimethylamino)propyl]acrylamide, methyl chloride quaternary)(DMAPAA-Q gel)-supported oxidising agent (KMnO4 or K2Cr2O7) was proposed to remove As from water. The gel could adsorb arsenite, As(III), and arsenate, As(V), through the ion exchange method, where the oxidising agent oxidised As(III) to As(V). theoretically speaking, the amount of oxidant in the gels can reach 73.7 Mol%. The maximal adsorption capacity of the D-Mn gel (DMAPAA-Q gel carrying MnO4−) and D-Cr gel (DMAPAA-Q gel carrying Cr2O72−) for As(III) could reach 200 mg g−1 and 263 mg g−1, respectively; moreover, the As(III) removal rate of the gels could still be maintained above 85% in a neutral or weak acid aquatic solution. Studies on the kinetic and adsorption isotherms indicated that the As adsorption by the D-Mn and D-Cr gels was dominated by chemisorption. The thermodynamic parameters of adsorption confirmed that the adsorption was an endothermic process. The removal of As is influenced by the co-existing high-valence anions. Based on these results, the gels were found to be efficient for the As(III) adsorption and could be employed for the As(III) removal from the industrial wastewater.
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17
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Li G, Zhang J, Li Y, Liu J, Yan Z. Adsorption characteristics of Pb(II), Cd(II) and Cu(II) on carbon nanotube-hydroxyapatite. Environ Technol 2021; 42:1560-1581. [PMID: 31566478 DOI: 10.1080/09593330.2019.1674385] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 09/21/2019] [Indexed: 06/10/2023]
Abstract
Based on batch experiments, we investigate the adsorption characteristics of Pb(II), Cd(II) and Cu(II) on multi-walled carbon nanotube-hydroxyapatite (MWCNT-HAP) composites in detail and explore the effects of the solid-to-liquid ratio, pH, the ionic strength, reaction time and temperature on adsorption. The results show that the adsorption on MWCNT-HAP follows Pb(II)>Cu(II)>Cd(II). With an increasing solid-to-liquid ratio, the adsorption quantity of Pb(II), Cd(II) and Cu(II) on MWCNT-HAP decreases, whereas the removal efficiency increases. The optimal pH for adsorption is 4.0∼6.0. The effect of the ionic strength on the adsorption of Cd(II) is pronounced, whereas that on the adsorption of Pb(II) and Cu(II) is small. In the single-component system and ternary-component system, the adsorption processes for Pb(II), Cd(II) and Cu(II) on MWCNT-HAP have fast kinetics, and the pseudo-second-order kinetics model can well describe the adsorption kinetics of the three heavy metals. The adsorption of Pb(II), Cd(II) and Cu(II) on MWCNT-HAP is spontaneous and endothermic, and the Langmuir model can well simulate the isothermal adsorption of Pb(II) and Cu(II), whereas the Langmuir and Freundlich models can be used to describe the isothermal adsorption of Cd(II).
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Affiliation(s)
- Gang Li
- Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi'an, People's Republic of China
| | - Jinli Zhang
- State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, People's Republic of China
| | - Yu Li
- School of Management Engineering, Dalian University of Science and Technology, Dalian, People's Republic of China
| | - Jia Liu
- School of Geological Engineering and Geomatics, Chang'an University, Xi'an, People's Republic of China
| | - Zhen Yan
- Tianjin Research Institute for Water Transport Engineering, Ministry of Transport, Tianjin, People's Republic of China
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18
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Xiao R, Gao D, Xie W, Fu Q, Wang L, Zhang K, Zeng J. Nonlinear behavior in preparative liquid chromatography: A method-development case study for hydroxytyrosol purification. J Sep Sci 2020; 44:973-980. [PMID: 33351272 DOI: 10.1002/jssc.202001003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 12/08/2020] [Accepted: 12/18/2020] [Indexed: 11/11/2022]
Abstract
Preparative liquid chromatography has become an important purification method owing to its advantages of high separation efficiency, good reproducibility, and low solvent consumption. Because overloading in preparative liquid chromatography must be performed to increase the throughput in a cycle, nonlinear chromatographic behavior is observed. Therefore, it is crucial to carefully study nonlinear chromatography for the purification of a given product, which facilitates the efficient optimization of the purification parameters. In this work, a method for the development of a purification method using preparative liquid chromatography based on nonlinear chromatography is proposed. Hydroxytyrosol was selected as the subject for method demonstration. Using methanol and ethanol as organic modifiers, the optimum flow rate was determined on three commercial columns entitled C8 TDE, C18 ME, and C18 TDE, respectively. The curves were fitted with the van Deemter equation, with thorough analysis of the A, B, and C terms. Adsorption isotherms were subsequently studied to explore the distribution of solutes between the stationary and mobile phases at equilibrium. C18 TDE, 5 vol% ethanol-water, and 0.2 mL/min were selected as the optimal separation material, elution solvent, and flow rate, respectively. Purification of hydroxytyrosol was tentatively confirmed on a C18 TDE column with 1.6% sample loading, 90.98% recovery, and 98.01% purity.
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Affiliation(s)
- Ruting Xiao
- School of Pharmacy, Southwest Medical University, Luzhou, P. R. China
| | - Die Gao
- School of Pharmacy, Southwest Medical University, Luzhou, P. R. China
| | - Wenjing Xie
- School of Pharmacy, Southwest Medical University, Luzhou, P. R. China
| | - Qifeng Fu
- School of Pharmacy, Southwest Medical University, Luzhou, P. R. China
| | - Lujun Wang
- School of Pharmacy, Southwest Medical University, Luzhou, P. R. China
| | - Kailian Zhang
- School of Pharmacy, Southwest Medical University, Luzhou, P. R. China
| | - Jing Zeng
- School of Pharmacy, Southwest Medical University, Luzhou, P. R. China
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19
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Álvarez-Esmorís C, Conde-Cid M, Fernández-Calviño D, Fernández-Sanjurjo MJ, Núñez-Delgado A, Álvarez-Rodríguez E, Arias-Estévez M. Adsorption-desorption of doxycycline in agricultural soils: Batch and stirred-flow-chamber experiments. Environ Res 2020; 186:109565. [PMID: 32371275 DOI: 10.1016/j.envres.2020.109565] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 03/31/2020] [Accepted: 04/20/2020] [Indexed: 05/23/2023]
Abstract
With the aim of obtaining information about the environmental fate and dynamics of the antibiotic doxycycline (DC) when it reaches soil, adsorption and desorption processes were studied for this compound in 20 agricultural soils, by means of batch-type and stirred-flow-chamber experiments. The results indicate that the studied soils adsorbed high amounts of DC, with adsorption percentages >91% in all cases. In addition, adsorption results were satisfactorily modeled, with good fittings to the Langmuir and Freundlich equations, with the values for Langmuir's maximum adsorption capacity (qmax) varying between 14,692 and 26,141 μmol kg-1 (average 17,816), and between 1,906 and 13,120 Ln μmol1-n kg-1 (average 6,969) for the Freundlich affinity coefficient, which are very high. The soil variables most related to the adsorption of the antibiotic were linked to organic matter (specifically, soil organic carbon-SOC- and soil nitrogen -N- contents), and to the clay fraction, as well as to cation exchange capacity, being the soils with a greater content in these variables those that presented a greater adsorption. FTIR results shown that DC adsorption mechanisms were based on interactions such as hydrogen bonds and π-π interactions between the antibiotic and soils. Desorption was very low, reaching values between 1 and 2% in batch experiments, and between 5 and 15% in stirred flow chamber experiments, which indicates a strong hysteresis affecting adsorption and desorption processes. This fact can be considered positively, as these soils could retain DC very strongly, thus reducing risks to human and ecological health.
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Affiliation(s)
- C Álvarez-Esmorís
- Soil Science and Agricultural Chemistry, Fac. Sciences, Univ. Vigo, 32004, Ourense, Spain
| | - M Conde-Cid
- Soil Science and Agricultural Chemistry, Fac. Sciences, Univ. Vigo, 32004, Ourense, Spain
| | - D Fernández-Calviño
- Soil Science and Agricultural Chemistry, Fac. Sciences, Univ. Vigo, 32004, Ourense, Spain
| | - M J Fernández-Sanjurjo
- Dept. Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Univ. Santiago de Compostela, 27002, Lugo, Spain
| | - A Núñez-Delgado
- Dept. Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Univ. Santiago de Compostela, 27002, Lugo, Spain
| | - E Álvarez-Rodríguez
- Dept. Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Univ. Santiago de Compostela, 27002, Lugo, Spain
| | - M Arias-Estévez
- Soil Science and Agricultural Chemistry, Fac. Sciences, Univ. Vigo, 32004, Ourense, Spain.
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20
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Hamid Y, Tang L, Hussain B, Usman M, Rehman Hashmi MLU, Bilal Khan M, Yang X, He Z. Immobilization and sorption of Cd and Pb in contaminated stagnic anthrosols as amended with biochar and manure combined with inorganic additives. J Environ Manage 2020; 257:109999. [PMID: 31868649 DOI: 10.1016/j.jenvman.2019.109999] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 12/02/2019] [Accepted: 12/12/2019] [Indexed: 06/10/2023]
Abstract
The present study evaluated the efficiency of pre-selected composite amendments (CA-1: biochar-lime-sepiolite-zeolite and CA-2: manure-lime-sepiolite) for immobilization and sorption of Cd and Pb in field and batch sorption experiments. The field experiment was performed in a co-contaminated clay purple soil (stagnic anthrosols). Along with a control experiment (T1), CA-1 and CA-2 were tested at different rates including 750, 1500, 3000 and 6000 kg ha-1 by growing wheat as the test crop. The obtained results revealed that the highest dose of both composites (T5: 6000 kg ha-1 and T9: 6000 kg ha-1) increased the soil pH to 6.85 and 6.81, respectively as compared to the control (5.63). DTPA-extractable Cd and Pb contents decreased with composite treatments (T7 and T4) at harvest stage samples. Metal fractionation depicted that application of amendments decreased the exchangeable fraction at harvesting stage. Application of CA-2 and CA-1 (3000 kg ha-1) significantly increased the plant biomass (by 28% and 24%, respectively) and grain yield (by 26% and 22%, respectively) of wheat. Furthermore, batch sorption experiment results revealed that Langmuir adsorption model better fitted the sorption results with R2 values ranging between 0.99 and 0.91 for Cd and Pb, respectively. CA-1 and CA-2 exhibited the maximum adsorption capacity for Cd with no significant difference among treatments but Pb adsorption capacity was highest in CA-1 followed by CA-2 and control. The results of our experiments revealed that the application of organics combined with inorganic materials enhanced Cd and Pb immobilization and sorption, consequently reducing metals availability in laboratory and field conditions. Moreover, for field trials, application of the composite amendments at 3000 kg ha-1 emerged as the suitable treatment for tested wheat-grown area.
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Affiliation(s)
- Yasir Hamid
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Lin Tang
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Bilal Hussain
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Muhammad Usman
- PEIE Research Chair for the Development of Industrial Estates and Free Zones, Center for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Oman
| | - Muhammad Laeeq Ur Rehman Hashmi
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Muhammad Bilal Khan
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Xiaoe Yang
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China.
| | - Zhenli He
- Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA
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21
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Ali N, Khan A, Bilal M, Malik S, Badshah S, Iqbal HMN. Chitosan-Based Bio-Composite Modified with Thiocarbamate Moiety for Decontamination of Cations from the Aqueous Media. Molecules 2020; 25:E226. [PMID: 31935863 PMCID: PMC6982774 DOI: 10.3390/molecules25010226] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 12/23/2019] [Accepted: 01/02/2020] [Indexed: 02/05/2023] Open
Abstract
Herein, we report the development of chitosan (CH)-based bio-composite modified with acrylonitrile (AN) in the presence of carbon disulfide. The current work aimed to increase the Lewis basic centers on the polymeric backbone using single-step three-components (chitosan, carbon disulfide, and acrylonitrile) reaction. For a said purpose, the thiocarbamate moiety was attached to the pendant functional amine (NH2) of chitosan. Both the pristine CH and modified CH-AN bio-composites were first characterized using numerous analytical and imaging techniques, including 13C-NMR (solid-form), Fourier-transform infrared spectroscopy (FTIR), elemental investigation, thermogravimetric analysis, and scanning electron microscopy (SEM). Finally, the modified bio-composite (CH-AN) was deployed for the decontamination of cations from the aqueous media. The sorption ability of the CH-AN bio-composite was evaluated by applying it to lead and copper-containing aqueous solution. The chitosan-based CH-AN bio-composite exhibited greater sorption capacity for lead (2.54 mmol g-1) and copper (2.02 mmol g-1) than precursor chitosan from aqueous solution based on Langmuir sorption isotherm. The experimental findings fitted better to Langmuir model than Temkin and Freundlich isotherms using linear regression method. Different linearization of Langmuir model showed different error functions and isothermal parameters. The nonlinear regression analysis showed lower values of error functions as compared with linear regression analysis. The chitosan with thiocarbamate group is an outstanding material for the decontamination of toxic elements from the aqueous environment.
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Affiliation(s)
- Nisar Ali
- Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, National & Local Joint Engineering Research Center for Deep Utilization Technology of Rock-salt Resource, Faculty of Chemical Engineering, Huaiyin Institute of Technology, Huaian 223003, China
| | - Adnan Khan
- Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, Campinas 13084-971, SP, Brazil
- Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa 25120, Pakistan; (A.K.); (S.M.)
| | - Muhammad Bilal
- School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian 223003, China;
| | - Sumeet Malik
- Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa 25120, Pakistan; (A.K.); (S.M.)
| | - Syed Badshah
- Department of Chemistry, Gomal University, D. I. Khan, Khyber Pakhtunkhwa 25120, Pakistan;
| | - Hafiz M. N. Iqbal
- Tecnologico de Monterrey, School of Engineering and Sciences, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey CP 64849, Mexico
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Brito MKT, Santos WRGD, Correia BRB, Queiroz RA, Tavares FVS, Neto GLO, Lima AGB. Moisture Absorption in Polymer Composites Reinforced with Vegetable Fiber: A Three-Dimensional Investigation via Langmuir Model. Polymers (Basel) 2019; 11:E1847. [PMID: 31717491 DOI: 10.3390/polym11111847] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/01/2019] [Accepted: 11/07/2019] [Indexed: 11/16/2022] Open
Abstract
This work aims to study numerically the moisture absorption in polymer composite reinforced with vegetable fibers using the Langmuir model which considers the existence of free and entrapped water molecules inside the material. A three-dimensional and transient modeling for describing the water absorption process inside the composite and its numerical solution via finite volume method were presented and discussed. Application has been made for polymer composites reinforced with sisal fiber. Emphasis was given to the effect of the layer thickness of fluid close to the wall of the composite in the progress of water migration. Results of the free and entrapped solute (water) concentration, local moisture content and average moisture content, at different times of process, and inside the composite were presented and analyzed. It was verified that concentration gradients of the molecules (free and entrapped) are higher in the material surface, at any time of the process, and concentration of free solute is greater than the concentration of entrapped solute. It was verified that the water layer thickness surrounding the composite strongly affects the moisture absorption rate.
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23
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Zheng G, Wu C, Wang J, Mo S, Zou Z, Zhou B, Long F. Space-Confined Effect One-Pot Synthesis of γ-AlO(OH)/MgAl-LDH Heterostructures with Excellent Adsorption Performance. Nanoscale Res Lett 2019; 14:281. [PMID: 31420778 PMCID: PMC6702593 DOI: 10.1186/s11671-019-3112-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 08/01/2019] [Indexed: 06/10/2023]
Abstract
Herein, γ-AlO(OH) as an inorganic was successfully inserted into MgAl-LDH layer by a one-pot synthesis, the composite as an adsorbent for removing methyl orange (MO) from wastewater. The structure and adsorption performance of γ-AlO(OH)/MgAl-LDH were characterized. The research shows that the expansion (003) plane and the hydroxyl active site of γ-AlO(OH)/MgAl-LDH can promote adsorption capacity and adsorption kinetics, respectively. Therefore, γ-AlO(OH)/MgAl-LDH exhibits a super adsorption performance, which completely adsorbs MO at the concentration of 1000 mg g-1. In addition, the maximum adsorption capacity of MO was 4681.40 mg g-1 according to the Langmuir model. These results indicate that γ-AlO(OH)/MgAl-LDH is a potential adsorbent for the removal of organic dyes in water.
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Affiliation(s)
- Guoyuan Zheng
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Guilin University of Technology, Guilin, 541004, China
- Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin, 541004, China
| | - Caihong Wu
- Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin, 541004, China
- Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin University of Technology, Guilin, 541004, China
| | - Jilin Wang
- Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin, 541004, China.
- Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin University of Technology, Guilin, 541004, China.
| | - Shuyi Mo
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Guilin University of Technology, Guilin, 541004, China
- Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin, 541004, China
| | - Zhengguang Zou
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Guilin University of Technology, Guilin, 541004, China
- Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin, 541004, China
| | - Bing Zhou
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Guilin University of Technology, Guilin, 541004, China
- Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin, 541004, China
| | - Fei Long
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Guilin University of Technology, Guilin, 541004, China.
- Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin, 541004, China.
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Sundaran SP, Reshmi CR, Sagitha P, Manaf O, Sujith A. Multifunctional graphene oxide loaded nanofibrous membrane for removal of dyes and coliform from water. J Environ Manage 2019; 240:494-503. [PMID: 30974292 DOI: 10.1016/j.jenvman.2019.03.105] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 02/25/2019] [Accepted: 03/21/2019] [Indexed: 06/09/2023]
Abstract
In this study, we fabricated a trifunctional polyurethane (PU)/graphene oxide (GO) electrospun membrane for adsorption of organic dyes such as methylene blue (MB) and rhodamine B (RB). Moreover, the prepared membrane showed antifouling property and inhibition against bacteria. The GO modified PU nanofiber shows a maximum adsorption capacity of 109.88 mg/g and 77.15 mg/g towards MB and RB respectively. Theoretical studies confirmed that the dye adsorption is followed pseudo-second-order kinetics and the Langmuir adsorption isotherm. The superhydrophilic PU/10GO membrane exhibits high water flux of 17,706 lm-2hr-1. This membrane also exhibits good antifouling property for separating oil-in-water emulsions with 99.99% separation efficiency. The Mechanism of antifouling was investigated using Hermia model. The results showed that PU/GO membranes also have antibacterial activity against Gram-negative and Gram-positive bacterias. Thus a superhydrophilic nanofibrous antifouling membrane that can reject both organic dye molecule and bacteria from contaminated water is developed using simple electrospinning technique.
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Affiliation(s)
- Suja P Sundaran
- Materials Research Laboratory, Department of Chemistry, National Institute of Technology Calicut, Calicut, 673601, Kerala, India
| | - C R Reshmi
- Materials Research Laboratory, Department of Chemistry, National Institute of Technology Calicut, Calicut, 673601, Kerala, India
| | - P Sagitha
- Materials Research Laboratory, Department of Chemistry, National Institute of Technology Calicut, Calicut, 673601, Kerala, India
| | - O Manaf
- Materials Research Laboratory, Department of Chemistry, National Institute of Technology Calicut, Calicut, 673601, Kerala, India
| | - A Sujith
- Materials Research Laboratory, Department of Chemistry, National Institute of Technology Calicut, Calicut, 673601, Kerala, India.
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25
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Huang Z, Gong B, Huang CP, Pan SY, Wu P, Dang Z, Chiang PC. Performance evaluation of integrated adsorption-nanofiltration system for emerging compounds removal: Exemplified by caffeine, diclofenac and octylphenol. J Environ Manage 2019; 231:121-128. [PMID: 30340131 DOI: 10.1016/j.jenvman.2018.09.092] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 09/24/2018] [Accepted: 09/26/2018] [Indexed: 06/08/2023]
Abstract
Emerging pollutants introduced into surface water pose potential hazards to the safety of drinking water. In this study, the removal performance of three emerging compounds (exemplified by caffeine, diclofenac and octylphenol, with different physico-chemical properties) from synthetic water and source water by combining activated carbon (AC) adsorption and nanofiltration (NF) membrane processes was evaluated and analyzed. Results from synthetic water showed that the adsorption isotherms modeled well with the Langmuir equation. The removal performance of target compounds by AC-NF system was more remarkable than that of NF-AC combination. In the source water system, the integrated AC-NF process with coagulation pretreatment (the alum dosage of 60 mg/L) achieved satisfactory performance (the removal efficiencies of three target compounds reached > 95%). Results showed the electrostatic interaction and pollutant hydrophobicity determined the behavior and the fate of selected PPCPs/EDCs during the sequential treatment process of coagulation, activated carbon adsorption, and NF membrane separation. Finally, the AC and NF membranes were analyzed by Fourier transform infrared spectroscopy and scanning electron microscopy to understand the mechanisms, i.e. electrostatic and hydrophobic effects on the total removal process. It suggests that the integrated AC-NF process with coagulation pretreatment should be a feasible approach for removing emerging compounds in waterworks.
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Affiliation(s)
- Zhujian Huang
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; Carbon Cycle Research Center, National Taiwan University, Taipei 10673, Taiwan; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Beini Gong
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Chin-Pao Huang
- Department of Civil & Environmental Engineering, University of Delaware, Newark, DE 19716, United States
| | - Shu-Yuan Pan
- Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Pen-Chi Chiang
- Carbon Cycle Research Center, National Taiwan University, Taipei 10673, Taiwan.
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26
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Muleja AA. Adsorption of platinum ion from "aged" aqueous solution: application and comparative study between purified MWCNTs and triphenylphosphine MWCNTs. Environ Sci Pollut Res Int 2018; 25:20032-20047. [PMID: 29748793 DOI: 10.1007/s11356-018-2187-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 04/30/2018] [Indexed: 06/08/2023]
Abstract
This study entails adsorption attempt of platinum ion from "aged" aqueous solution with purified multiwalled carbon nanotubes and tryphenylphosphine-linked multiwalled carbon nanotubes (1) and (2) (Tpp-MWCNTs (1) and Tpp-MWCNTs (2)). The aims were to produce and use purified MWCNTs, Tpp-MWCNTs (1) and (2) and compare their adsorption capacity. These adsorbents were characterised with SEM, FTIR, XPS, BET and zeta potential. Tpp-MWCNTs (1) and (2) differ by their atomic percentage content of phosphorus which is 0.7 and 2.6%, respectively. A commercial stock solution (1000 mg/L) of platinum was used for the batch adsorption experiments. The data revealed that the adsorption was dependent on the following parameters: pH, contact time and initial concentration. The adsorbents attained higher adsorption capacity at pH 2 with an initial concentration of 7.9 mg/L, adsorbent dose of 0.8 g/L, contact time of 60 min at room temperature (RT), whereas 48.25, 40.06 and 41.31 mg/g were adsorbed from 20 mg/L by purified MWCNTs, Tpp-MWCNTs (1) and (2), respectively. The results are quite interesting and show that purified MWCNTs are better than Tpp-MWCNTs under the experimental conditions. The data was best described by the Langmuir model and the adsorption process occurs on the surface monolayer of the adsorbents. The isotherm studies confirmed that the adsorption of platinum ion is favourable. The findings indicate that the practical adsorption of platinum ion using the adsorbents investigated is useful.
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Affiliation(s)
- Adolph Anga Muleja
- College of Science, Engineering and Technology, University of South Africa, Florida Campus, Johannesburg, 1710, South Africa.
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27
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Sanz-Hernández D, Fernández-Pacheco A. Correction: Modelling focused electron beam induced deposition beyond Langmuir adsorption. Beilstein J Nanotechnol 2017; 8:2591. [PMID: 29266126 PMCID: PMC5727783 DOI: 10.3762/bjnano.8.259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 11/24/2017] [Indexed: 06/07/2023]
Abstract
[This corrects the article DOI: 10.3762/bjnano.8.214.].
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Affiliation(s)
- Dédalo Sanz-Hernández
- Cavendish Laboratory, University of Cambridge, JJ Thomson Cambridge, CB3 0HE, United Kingdom
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28
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Sanz-Hernández D, Fernández-Pacheco A. Modelling focused electron beam induced deposition beyond Langmuir adsorption. Beilstein J Nanotechnol 2017; 8:2151-2161. [PMID: 29090116 PMCID: PMC5647696 DOI: 10.3762/bjnano.8.214] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 09/18/2017] [Indexed: 05/03/2023]
Abstract
In this work, the continuum model for focused electron beam induced deposition (FEBID) is generalized to account for multilayer adsorption processes. Two types of adsorption energies, describing both physisorption and spontaneous chemisorption, are included. Steady state solutions under no diffusion are investigated and compared under a wide range of conditions. The different growth regimes observed are fully explained by relative changes in FEBID characteristic frequencies. Additionally, we present a set of FEBID frequency maps where growth rate and surface coverage are plotted as a function of characteristic timescales. From the analysis of Langmuir, as well as homogeneous and heterogeneous multilayer maps, we infer that three types of growth regimes are possible for FEBID under no diffusion, resulting into four types of adsorption isotherms. We propose the use of these maps as a powerful tool for the analysis of FEBID processes.
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Affiliation(s)
- Dédalo Sanz-Hernández
- Cavendish Laboratory, University of Cambridge, JJ Thomson Cambridge, CB3 0HE, United Kingdom
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29
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Jin Q, Huang L, Li A, Shan A. Quantification of the limitation of Langmuir model used in adsorption research on sediments via site energy heterogeneity. Chemosphere 2017; 185:518-528. [PMID: 28715763 DOI: 10.1016/j.chemosphere.2017.07.051] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 07/10/2017] [Accepted: 07/11/2017] [Indexed: 06/07/2023]
Abstract
The Langmuir model has been extensively introduced into the field of environmental adsorption, while some studies showed that it was difficult for the model to describe the adsorption of sediments. The purpose of this paper is to recognize the applicability of the Langmuir model used in the adsorption of contaminants onto sediments quantitatively through the relationship between the error of Langmuir (δ) and site energy heterogeneity (σ). The formula for calculating δ in sediments was developed based on the heterogeneity parameters (m, n). The data was extracted from papers discussing about the adsorption of pollutants on natural sediments. It was further used to investigate the error of Langmuir and the effect on the error from the site energy heterogeneity. The results indicate that the Langmuir model can be applied in sediments when each one of the conditions below is satisfied, (1) m and n lie in the area which signifies that the relative error is less than 10%, (2) the site energy heterogeneity of sediment is under 5.668. These findings are vital for the proper choice of models fitting the adsorption process of sediments.
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Affiliation(s)
- Qiang Jin
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Minhang District, Shanghai 200240, PR China.
| | - Limin Huang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Minhang District, Shanghai 200240, PR China
| | - Aimin Li
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China
| | - Aidang Shan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Minhang District, Shanghai 200240, PR China
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30
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Agathian K, Kannammal L, Meenarathi B, Kailash S, Anbarasan R. Synthesis, characterization and adsorption behavior of cotton fiber based Schiff base. Int J Biol Macromol 2017; 107:1102-1112. [PMID: 28970165 DOI: 10.1016/j.ijbiomac.2017.09.086] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Revised: 09/16/2017] [Accepted: 09/21/2017] [Indexed: 11/29/2022]
Abstract
Structural modification of Cotton (Cot) fiber was carried out using ε-caprolactone (CL) as a monomer and oxydianiline (ODA) as a Schiff base forming agent in the presence of V2O5 catalyst in dimethylsulfoxide medium for 24h under air atmosphere (0.10MPa) at 80°C. The obtained products were analyzed for the characteristics and also for its adsorption of hexavalent chromium (Cr(VI)) and rhodamine 6G (R6G) dye molecules. The 1H NMR spectrum confirms the Schiff base formation at 8.7ppm. The adsorption study confirms the Pseudo second order kinetics with Langmuir adsorption model. The structurally modified Cot fiber based Schiff base exhibited the highest adsorption behavior through chemical interaction forces. The thermodynamic parameters were determined and confirmed the endothermic adsorption process.
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Affiliation(s)
- K Agathian
- Department of Polymer Technology, Kamaraj College of Engineering and Technology, Virudhunagar, 626 001, Tamilnadu, India
| | - L Kannammal
- Department of Chemistry, V.P.M.M Arts and Science College for Women, V.P.M. Nagar, Krishnankoil, Srivilliputtur, 626 190, Tamilnadu, India
| | - B Meenarathi
- Department of Polymer Technology, Kamaraj College of Engineering and Technology, Virudhunagar, 626 001, Tamilnadu, India
| | - S Kailash
- Department of Polymer Technology, Kamaraj College of Engineering and Technology, Virudhunagar, 626 001, Tamilnadu, India
| | - R Anbarasan
- Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan, ROC.
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31
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Szczotok AM, Carmona M, Kjøniksen AL, Rodriguez JF. Equilibrium adsorption of polyvinylpyrrolidone and its role on thermoregulating microcapsules synthesis process. Colloid Polym Sci 2017; 295:783-92. [PMID: 28479656 DOI: 10.1007/s00396-017-4061-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 02/20/2017] [Accepted: 02/24/2017] [Indexed: 11/25/2022]
Abstract
The adsorption of polyvinylpyrrolidone (PVP) by the thermoregulating microcapsules has been studied. The mass ratio of PVP has been changed from 1 to 20, with respect to the lowest amount of PVP value (4.08 g). The results confirmed that a large amount of PVP was adsorbed by the polymeric shell. Experimental data were perfectly fitted by Langmuir model, obtaining at a confidence level of 95% values of 192.9 ± 0.4 g/kg and 0.18 ± 0.11 m3/kg for the maximum adsorption capacity and the equilibrium constant, respectively. It was found that utilizing PVP, at a concentration of 5.03 wt% of the total mass provided optimum conditions for synthesizing thermoregulating microcapsules containing Rubitherm®RT27 from poly(styrene-divinylbenzene) (P(St-DVB)), with the best thermal and physical properties. Finally, the robustness of the process was checked at a large scale by using a reactor that maintains geometrical similarities with that used at laboratory scale. The thermal properties, the encapsulation efficiency, and the microcapsule yield were similar, but at pilot plant scale, narrower particle size distributions were obtained.
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32
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Arco-Lázaro E, Agudo I, Clemente R, Bernal MP. Arsenic(V) adsorption-desorption in agricultural and mine soils: Effects of organic matter addition and phosphate competition. Environ Pollut 2016; 216:71-79. [PMID: 27239690 DOI: 10.1016/j.envpol.2016.05.054] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 05/13/2016] [Accepted: 05/19/2016] [Indexed: 05/26/2023]
Abstract
High total and bioavailable concentrations of As in soils represent a potential risk for groundwater contamination and entry in the food chain. The use of organic amendments in the remediation of As-contaminated soils has been found to produce distinct effects on the solubility of As in the soil. Therefore, knowledge about As adsorption-desorption processes that govern its solubility in soil is of relevance in order to predict the behaviour of this element during these processes. In this paper, the objective was to determine As adsorption and desorption in four different soils, with and without compost addition, and also in competition with phosphate, through the determination of sorption isotherms. Batch experiments were carried out using three soils affected differently by previous mining activity of the Sierra Minera of La Unión-Cartagena (SE Spain) and an agricultural soil from Segovia province (central Spain). Adsorption was higher in the mining soils (and highest in the acidic one) than in the agricultural soils, although the latter were not affected negatively by organic matter or phosphate competition for sorption sites. The results show that As adsorption in most soils, both with and without compost, fitted better a multimolecular layer model (Freundlich), whereas As adsorption in competition with P fitted a monolayer model (Langmuir). Moreover, the use of compost and phosphate reduced the adsorption of As in the mining soils, while in the agricultural soils compost increased their low adsorption capacity. Therefore, the use of compost can be a good option to favour As immobilisation in soils of low adsorption, but knowledge of the soil composition will be crucial to predict the effects of organic amendments on As solubility in soils and its associated environmental risk.
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Affiliation(s)
- Elena Arco-Lázaro
- Department of Soil and Water Conservation and Organic Waste Management, Centro de Edafología y Biología Aplicada del Segura-CSIC, Campus Universitario de Espinardo, 30100 Murcia, Spain
| | - Inés Agudo
- Department of Soil and Water Conservation and Organic Waste Management, Centro de Edafología y Biología Aplicada del Segura-CSIC, Campus Universitario de Espinardo, 30100 Murcia, Spain
| | - Rafael Clemente
- Department of Soil and Water Conservation and Organic Waste Management, Centro de Edafología y Biología Aplicada del Segura-CSIC, Campus Universitario de Espinardo, 30100 Murcia, Spain.
| | - M Pilar Bernal
- Department of Soil and Water Conservation and Organic Waste Management, Centro de Edafología y Biología Aplicada del Segura-CSIC, Campus Universitario de Espinardo, 30100 Murcia, Spain
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33
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Park JH, Ok YS, Kim SH, Cho JS, Heo JS, Delaune RD, Seo DC. Evaluation of phosphorus adsorption capacity of sesame straw biochar on aqueous solution: influence of activation methods and pyrolysis temperatures. Environ Geochem Health 2015; 37:969-83. [PMID: 26040973 DOI: 10.1007/s10653-015-9709-9] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 05/06/2015] [Indexed: 05/27/2023]
Abstract
The phosphorus (P) adsorption characteristic of sesame straw biochar prepared with different activation agents and pyrolysis temperatures was evaluated. Between 0.109 and 0.300 mg L(-1) in the form of inorganic phosphate was released from raw sesame straw biochar in the first 1 h. The release of phosphate was significantly enhanced from 62.6 to 168.2 mg g(-1) as the pyrolysis temperature increased. Therefore, sesame straw biochar cannot be used as an adsorbent for P removal without change in the physicochemical characteristics. To increase the P adsorption of biochar in aqueous solution, various activation agents and pyrolysis temperatures were applied. The amount of P adsorbed from aqueous solution by biochar activated using different activation agents appeared in the order ZnCl2 (9.675 mg g(-1)) > MgO (8.669 mg g(-1)) ⋙ 0.1N-HCl > 0.1N-H2SO4 > K2SO4 ≥ KOH ≥ 0.1N-H3PO4, showing ZnCl2 to be the optimum activation agent. Higher P was adsorbed by the biochar activated using ZnCl2 under different pyrolysis temperatures in the order 600 °C > 500 °C > 400 °C > 300 °C. Finally, the amount of adsorbed P by activated biochar at different ratios of biochar to ZnCl2 appeared in the order 1:3 ≒ 1:1 > 3:1. As a result, the optimum ratio of biochar to ZnCl2 and pyrolysis temperature were found to be 1:1 and 600 °C for P adsorption, respectively. The maximum P adsorption capacity by activated biochar using ZnCl2 (15,460 mg kg(-1)) was higher than that of typical biochar, as determined by the Langmuir adsorption isotherm. Therefore, the ZnCl2 activation of sesame straw biochar was suitable for the preparation of activated biochar for P adsorption.
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Affiliation(s)
- J H Park
- Divison of Applied Life Science (BK21 Program), Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 660-701, Republic of Korea
| | - Y S Ok
- Korea Biochar Research Center, Department of Biological Environment, Kangwon National University, Chuncheon, 200-701, Republic of Korea
| | - S H Kim
- Divison of Applied Life Science (BK21 Program), Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 660-701, Republic of Korea
| | - J S Cho
- Department of Bio-Environmental Sciences, Sunchon National University, Suncheon, 540-950, Republic of Korea.
| | - J S Heo
- Divison of Applied Life Science (BK21 Program), Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 660-701, Republic of Korea
| | - R D Delaune
- Department of Oceanography and Costal Sciences, School of the Coast and Environment, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - D C Seo
- Department of Bio-Environmental Sciences, Sunchon National University, Suncheon, 540-950, Republic of Korea.
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34
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Di Natale F, Erto A, Lancia A, Musmarra D. Equilibrium and dynamic study on hexavalent chromium adsorption onto activated carbon. J Hazard Mater 2015; 281:47-55. [PMID: 25155159 DOI: 10.1016/j.jhazmat.2014.07.072] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 07/28/2014] [Accepted: 07/29/2014] [Indexed: 06/03/2023]
Abstract
In this work, the results of equilibrium and dynamic adsorption tests of hexavalent chromium, Cr (VI), on activated carbon are presented. Adsorption isotherms were determined at different levels of pH and temperature. Dynamic tests were carried out in terms of breakthrough curves of lab-scale fixed bed column at different pH, inlet concentration and flow rate. Both the adsorption isotherms and the breakthrough curves showed non-linear and unconventional trends. The experimental results revealed that chromium speciation played a key role in the adsorption process, also for the occurrence of Cr(VI)-to-Cr(III) reduction reactions. Equilibrium tests were interpreted in light of a multi-component Langmuir model supported by ion speciation analysis. For the interpretation of the adsorption dynamic tests, a mass transfer model was proposed. Dynamic tests at pH 11 were well described considering the external mass transfer as the rate controlling step. Differently, for dynamic tests at pH 6 the same model provided a satisfying description of the experimental breakthrough curves only until a sorbent coverage around 1.6mgg(-1). Above this level, a marked reduction of the breakthrough curve slope was observed in response to a transition to an inter-particle adsorption mechanism.
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Affiliation(s)
- F Di Natale
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università di Napoli "Federico II", Piazzale Tecchio 80, 80125, Napoli, Italy
| | - A Erto
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università di Napoli "Federico II", Piazzale Tecchio 80, 80125, Napoli, Italy.
| | - A Lancia
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università di Napoli "Federico II", Piazzale Tecchio 80, 80125, Napoli, Italy
| | - D Musmarra
- Dipartimento di Ingegneria Civile, Design, Edilizia e Ambiente, Seconda Università di Napoli, Via Roma 29, 81031, Aversa (CE), Italy
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O'Brien MN, Radha B, Brown KA, Jones MR, Mirkin CA. Langmuir analysis of nanoparticle polyvalency in DNA-mediated adsorption. Angew Chem Int Ed Engl 2014; 53:9532-8. [PMID: 25044776 DOI: 10.1002/anie.201405317] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Indexed: 01/13/2023]
Abstract
Many nanoparticle adsorption processes are dictated by the collective interactions of surface-bound ligands. These adsorption processes define how nanoparticles interact with biological systems and enable the assembly of nanoparticle-based materials and devices. Herein, we present an approach for quantifying nanoparticle adsorption thermodynamics in a manner that satisfies the assumptions of the Langmuir model. Using this approach, we study the DNA-mediated adsorption of polyvalent anisotropic nanoparticles on surfaces and explore how deviations from model assumptions influence adsorption thermodynamics. Importantly, when combined with a solution-based van't Hoff analysis, we find that polyvalency plays a more important role as the individual interactions become weaker. Furthermore, we find that the free energy of anisotropic nanoparticle adsorption is consistent across multiple shapes and sizes of nanoparticles based on the surface area of the interacting facet.
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Affiliation(s)
- Matthew N O'Brien
- Department of Chemistry, International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Rd, Evanston, IL 60208 (USA)
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He E, Qiu H, Van Gestel CAM. Modelling uptake and toxicity of nickel in solution to Enchytraeus crypticus with biotic ligand model theory. Environ Pollut 2014; 188:17-26. [PMID: 24531268 DOI: 10.1016/j.envpol.2014.01.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 12/18/2013] [Accepted: 01/17/2014] [Indexed: 06/03/2023]
Abstract
Protons and other cations may inhibit metal uptake and alleviate metal toxicity in aquatic organisms, but less is known about these interactions in soil organisms. The present study investigated the influence of solution chemistry on uptake and toxicity of Ni in Enchytraeus crypticus after 14 days exposure. Ca(2+), Mg(2+) and Na(+) were found to exert significant effects on both uptake and toxicity of Ni. An extended Langmuir model, which incorporated cation competition effects, well predicted Ni uptake. The LC50{Ni(2+)} predicted by a developed Biotic Ligand Model matched well with observed values. These suggest that cation competition needs to be taken into account when modelling uptake and effects. The binding constants of Ni(2+), Mg(2+) and Na(+) on the uptake and toxic action sites were similar, but for Ca(2+) they differed. This indicates that the effect of Ca(2+) on Ni(2+) toxicity cannot simply be explained by the competition for entry into organism.
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Affiliation(s)
- Erkai He
- Department of Ecological Science, Faculty of Earth and Life Sciences, VU University, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands
| | - Hao Qiu
- Institute of Environmental Sciences, Leiden University, Leiden, The Netherlands
| | - Cornelis A M Van Gestel
- Department of Ecological Science, Faculty of Earth and Life Sciences, VU University, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands.
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