Base de dados : MEDLINE
Pesquisa : G02.437 [Categoria DeCS]
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  1 / 3557 MEDLINE  
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[PMID]:29175404
[Au] Autor:Dehbandi R; Moore F; Keshavarzi B
[Ad] Endereço:Department of Earth Sciences, College of Sciences, Shiraz University, Shiraz, 71454, Iran. Electronic address: rezadehbandi65@gmail.com.
[Ti] Título:Geochemical sources, hydrogeochemical behavior, and health risk assessment of fluoride in an endemic fluorosis area, central Iran.
[So] Source:Chemosphere;193:763-776, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The present study is the first attempt to put forward the possible source(s) and health risk assessment of fluoride in Bahabad, central Iran. Fluoride concentrations ranged from 0.22 to 2.35 mg/L and 292-355 mg/kg in the groundwater and soil samples, respectively. Geochemical provenance techniques using major and rare earth elements in soils revealed that local shale is the most probable source rock of fluoride in the area. A two-step chemical fractionation method applied on soil samples demonstrated that residual and water-soluble fractions were the most probable modes of fluoride in soil, whereas exchangeable fraction had a minor role. The coefficient of aqueous migration showed that fluoride in the studied soils behaved as a mobile element. Moreover, the relative mobility indicated that soils played a more important role than rocks in releasing fluoride into groundwater. In groundwater medium, chemical weathering, evaporation, and ion exchange acted as the main geochemical controlling factors of fluoride enrichment. Findings of this study signify that the role of NaCl and NaSO -type waters should be considered more to recognize susceptible areas to fluoride contamination in groundwater. People in the study area are exposed to high levels of fluoride intake through drinking water, thus making dental fluorosis a major public health concern in the area. Scanning electron microscopy of the dentin's enamel showed morphological modifications (e.g., cracks and fissures) in residents' enamel structures. The results of this study may lead to suitable management strategies to mitigate the endemic fluorosis problem.
[Mh] Termos MeSH primário: Monitoramento Ambiental/métodos
Poluição Ambiental
Fluoretos/efeitos adversos
Medição de Risco
[Mh] Termos MeSH secundário: Fluoretos/análise
Fluorose Dentária/epidemiologia
Fluorose Dentária/etiologia
Água Subterrânea/química
Seres Humanos
Troca Iônica
Irã (Geográfico)
Solo/química
Erosão Dentária/diagnóstico por imagem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil); Q80VPU408O (Fluorides)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171128
[St] Status:MEDLINE


  2 / 3557 MEDLINE  
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[PMID]:27774905
[Au] Autor:Imbrogno A; Biscarat J; Schafer AI
[Ad] Endereço:Karlsruhe Institute of Technology, Institute of Functional Interfaces, Membrane Technology Department, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
[Ti] Título:Estradiol Uptake in a Combined Magnetic Ion Exchange - Ultrafiltration (MIEX-UF) Process During Water Treatment.
[So] Source:Curr Pharm Des;23(2):328-337, 2017.
[Is] ISSN:1873-4286
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Estrogens and their synthetic analogues are widely used as pharmaceuticals. Upon oral administration these drugs are eventually excreted via urine. The persistence of these pharmaceuticals and inefficient removal by water treatment lead to accumulation in surface water and effluents with negative effects for aquatic life and human health. METHODS: In this study, the uptake of estradiol by a combined magnetic ion exchange resin - ultrafiltration process (MIEX-UF) was investigated. This is a relatively common process used in drinking water treatment for the removal of natural organic matter. However, uptake of micropollutants, such as steroidal pharmaceuticals, may occur as a side effect of water treatment due to the high affinity for polymeric materials. To elucidate the mechanism governing estradiol partitioning between water, resin and membrane, the influence of different parameters, such as pH, humic acid concentration and membrane molecular-weight-cut-off (MWCO) was studied. RESULTS: Humic acid concentration and pH affected estradiol uptake most. At pH 11 the most significant increase of estradiol uptake was observed for MIEX-UF process (30 ng/g corresponding to 80%) compared with individual UF (17 ng/g corresponding to 12%). The presence of humic acid slightly reduced estradiol uptake at pH 11 (about 55%) due to competition for the ion exchange binding sites. CONCLUSION: Results demonstrated that the uptake of estradiol, which is amongst the most potent EDCs detected in surface water, in the MIEX-UF process can reach significant quantities (30 ng/g of resin) leading to uncontrolled accumulation of this micropollutant during drinking water treatment. This study gives a novel contribution in the understanding the mechanism of the unanticipated accumulation of pharmaceuticals, such as estradiol, in the drinking water treatment process.
[Mh] Termos MeSH primário: Estradiol/isolamento & purificação
Troca Iônica
Campos Magnéticos
Ultrafiltração/métodos
Purificação da Água/métodos
Água/química
[Mh] Termos MeSH secundário: Estradiol/química
Seres Humanos
Substâncias Húmicas
Concentração de Íons de Hidrogênio
Resinas de Troca Iônica/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Humic Substances); 0 (Ion Exchange Resins); 059QF0KO0R (Water); 4TI98Z838E (Estradiol)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180227
[Lr] Data última revisão:
180227
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE
[do] DOI:10.2174/1381612822666161021142412


  3 / 3557 MEDLINE  
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[PMID]:27775109
[Au] Autor:Zhang XR; Zhang Y; Chen FT; Li Y; Zhang SS
[Ad] Endereço:Key Laboratory of Sensor Analysis of Tumor Marker, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.
[Ti] Título:Visual detection of single-nucleotide polymorphisms and DNA methyltransferase based on cation-exchange of CuS nanoparticles and click chemistry of functionalized gold nanoparticles.
[So] Source:Chem Commun (Camb);52(90):13261-13264, 2016 Nov 03.
[Is] ISSN:1364-548X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A novel biosensor was developed based on the cation-exchange of CuS nanoparticles (NPs) and Cu(i)-based click chemistry of functionalized gold nanoparticles (AuNPs). As a proof-of-principle, novel applications of this method as a versatile biosensor for single-nucleotide polymorphisms (SNPs) and DNA methyltransferase (MTase) were presented.
[Mh] Termos MeSH primário: Técnicas Biossensoriais/métodos
Calorimetria/métodos
Cobre/química
Metilases de Modificação do DNA/metabolismo
Ouro/química
Nanopartículas Metálicas/química
Polimorfismo de Nucleotídeo Único
[Mh] Termos MeSH secundário: Química Click
Troca Iônica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
7440-57-5 (Gold); 789U1901C5 (Copper); EC 2.1.1.- (DNA Modification Methylases); KL4YU612X7 (cupric sulfide)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180205
[Lr] Data última revisão:
180205
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161104
[St] Status:MEDLINE


  4 / 3557 MEDLINE  
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[PMID]:28459593
[Au] Autor:Jolin WC; Goyetche R; Carter K; Medina J; Vasudevan D; MacKay AA
[Ad] Endereço:Department of Civil and Environmental Engineering, University of Connecticut , Storrs, Connecticut 06269, United States.
[Ti] Título:Predicting Organic Cation Sorption Coefficients: Accounting for Competition from Sorbed Inorganic Cations Using a Simple Probe Molecule.
[So] Source:Environ Sci Technol;51(11):6193-6201, 2017 Jun 06.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:With the increasing number of emerging contaminants that are cationic at environmentally relevant pH values, there is a need for robust predictive models of organic cation sorption coefficients (K ). Current predictive models fail to account for the differences in the identity, abundance, and affinity of surface-associated inorganic exchange ions naturally present at negatively charged receptor sites on environmental solids. To better understand how organic cation sorption is influenced by surface-associated inorganic exchange ions, sorption coefficients of 10 organic cations (including eight pharmaceuticals and two simple probe organic amines) were determined for six homoionic forms of the aluminosilicate mineral, montmorillonite. Organic cation sorption coefficients exhibited consistent trends for all compounds across the various homoionic clays with sorption coefficients (K ) decreasing as follows: K > K ≥ K > K ≥ K > K . This trend for competition between organic cations and exchangeable inorganic cations is consistent with the inorganic cation selectivity sequence, determined for exchange between inorganic ions. Such consistent trends in competition between organic and inorganic cations suggested that a simple probe cation, such as phenyltrimethylammonium or benzylamine, could capture soil-to-soil variations in native inorganic cation identity and abundance for the prediction of organic cation sorption to soils and soil minerals. Indeed, sorption of two pharmaceutical compounds to 30 soils was better described by phenyltrimethylammonium sorption than by measures of benzylamine sorption, effective cation exchange capacity alone, or a model from the literature (Droge, S., and Goss, K. Environ. Sci. Technol. 2013, 47, 14224). A hybrid approach integrating structural scaling factors derived from this literature model of organic cation sorption, along with phenyltrimethylammonium K values, allowed for estimation of K values for more structurally complex organic cations to homoionic montmorillonites and to heteroionic soils (mean absolute error of 0.27 log unit). Accordingly, we concluded that the use of phenyltrimethylammonium as a probe compound was a promising means to account for the identity, affinity, and abundance of natural exchange ions in the prediction of organic cation sorption coefficients for environmental solids.
[Mh] Termos MeSH primário: Cátions
Poluentes do Solo
[Mh] Termos MeSH secundário: Adsorção
Troca Iônica
Solo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cations); 0 (Soil); 0 (Soil Pollutants)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171212
[Lr] Data última revisão:
171212
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170502
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.7b01277


  5 / 3557 MEDLINE  
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[PMID]:29053240
[Ti] Título:Cellulose Nanocrystals 'Offer Promising Approach for Bone Regeneration.'
[So] Source:J Calif Dent Assoc;45(1):12, 2017 01.
[Is] ISSN:1043-2256
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Regeneração Óssea/efeitos dos fármacos
Celulose/farmacologia
Nanopartículas
[Mh] Termos MeSH secundário: Troca Iônica
Tecidos Suporte
[Pt] Tipo de publicação:NEWS
[Nm] Nome de substância:
9004-34-6 (Cellulose)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171113
[Lr] Data última revisão:
171113
[Sb] Subgrupo de revista:D
[Da] Data de entrada para processamento:171021
[St] Status:MEDLINE


  6 / 3557 MEDLINE  
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[PMID]:28802525
[Au] Autor:Zhou W; Wang C; Liu Y; Zhang W; Chen Z
[Ad] Endereço:Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, Wuhan University School of Pharmaceutical Sciences, Wuhan 430071, China; State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Beijing 10080, China.
[Ti] Título:Layered double hydroxides based ion exchange extraction for high sensitive analysis of non-steroidal anti-inflammatory drugs.
[So] Source:J Chromatogr A;1515:23-29, 2017 Sep 15.
[Is] ISSN:1873-3778
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Layered double hydroxides (LDHs) are ideal sorbents for solid phase extraction (SPE) because of the excellent ion exchange capacity and high specific surface area. However, difficult elution of the analytes from the LDHs is a problem due to the strong ionic interaction between anions and LDHs. High concentrated NaOH solution is employed to elute the sample, but it not suitable for analyzing by HPLC. To solve this problem, a simple acid-base neutralization method was proposed after elution, and then the neutral samples were directly injected to HPLC for analysis. Nickel-aluminum layered double hydroxides (NiAl-LDHs) were synthesized by co-precipitation method and packed into a micro pipette tip for the extraction of three non-steroidal anti-inflammatory drugs (NSAIDs) including ketoprofen, naproxen and flurbiprofen from aqueous samples. After optimization of the experimental parameters such as the concentration of the NaOH, sample pH, sampling rate and sample volume, excellent extraction efficiency towards three NSAIDs was obtained with high enrichment factors of 28-32. A NiAl-LDHs based SPE-HPLC method was developed for quantitative analysis of NSAIDs, and the method showed low limits of detection (0.002-0.1ng/mL), good linearity (R ≥0.9995) and good reproducibility (intraday RSD≤4.37%). The developed method was also applied to the analysis of three NSAIDs in spiked human plasma and rat plasma after oral administration, which demonstrated the practicality of the proposed method.
[Mh] Termos MeSH primário: Anti-Inflamatórios não Esteroides/análise
Técnicas de Química Analítica/métodos
Troca Iônica
Extração em Fase Sólida
[Mh] Termos MeSH secundário: Animais
Anti-Inflamatórios não Esteroides/sangue
Anti-Inflamatórios não Esteroides/isolamento & purificação
Cromatografia Líquida de Alta Pressão
Seres Humanos
Limite de Detecção
Ratos
Reprodutibilidade dos Testes
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Inflammatory Agents, Non-Steroidal)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171012
[Lr] Data última revisão:
171012
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170814
[St] Status:MEDLINE


  7 / 3557 MEDLINE  
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[PMID]:28759793
[Au] Autor:Thompson Brewster E; Jermakka J; Freguia S; Batstone DJ
[Ad] Endereço:Advanced Water Management Centre, The University of Queensland, St Lucia, QLD 4072, Australia.
[Ti] Título:Modelling recovery of ammonium from urine by electro-concentration in a 3-chamber cell.
[So] Source:Water Res;124:210-218, 2017 Nov 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Electro-concentration enables treatment and nutrient recovery from source-separated urine, and is a potential technology for on-site treatment using a 3 compartment configuration that has anode, cathode and middle concentrate compartments. There is a particular focus on driving concentration towards the precipitation threshold in the concentrate compartment to generate solid ammonium salts, including ammonium bicarbonate. To evaluate controlling mechanisms and the feasibility of achieving high concentrations, a dynamic mechanistic model was developed and validated using experiments with synthetic urine. It was identified that high concentrations are prevented by increased back diffusion (diffusion from the middle chamber to the anolyte and catholyte) due to large concentration gradients, and the preferential migration of protons or hydroxide ions due to a loss of buffering capacity in the anolyte and catholyte (due to pH extremes). Model-based sensitivity analysis also identified that electrolyte ion concentrations (including buffer capacity) were the main controlling mechanisms, rather than membrane or electrolyte current transfer capacity. To attain high concentrations, operation should be done using a) a high current density (however there is a maximum efficient current density); b) feed at short hydraulic retention time to ensure sufficient buffer capacity; and c) a feed high in ammonium and carbonate, not diluted, and not contaminated with other salts, such as pure ureolysed urine. Taking into account electron supply and bio-anodic buffer limitations, model testing shows at least double the aqueous concentrations observed in the experiments may be achieved by optimising simple process and operational parameters such as flow rate, current density and feed solution composition. Removal of total ammonium nitrogen (TAN) and total carbonate carbon (TCC) was between 43-57% and 39-53%, respectively. Balancing the sometimes conflicting process goals of high concentrations and removal percentage will need to be considered in further application. Future experimental work should be directed towards developing electrodes capable of higher current densities. In addition it would be desirable to use ion exchange membranes with higher resistance to water fluxes and which limit back diffusion. Future modelling work should describe osmotic and electro-osmotic water fluxes as a function of the concentration gradient across the membranes and ionic fluxes, respectively. More generalised wastewater physico-chemistry speciation models should identify best methods where relatively simple Davies activity corrections do not apply.
[Mh] Termos MeSH primário: Compostos de Amônio/química
Águas Residuais
[Mh] Termos MeSH secundário: Eletrodos
Troca Iônica
Modelos Teóricos
Nitrogênio
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ammonium Compounds); 0 (Waste Water); N762921K75 (Nitrogen)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170801
[St] Status:MEDLINE


  8 / 3557 MEDLINE  
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[PMID]:28676931
[Au] Autor:Batabyal AK; Gupta S
[Ad] Endereço:Environmental Engineering Group, CSIR-Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur, West Bengal, 713209, India. drakbatabyal@gmail.com.
[Ti] Título:Fluoride-contaminated groundwater of Birbhum district, West Bengal, India: Interpretation of drinking and irrigation suitability and major geochemical processes using principal component analysis.
[So] Source:Environ Monit Assess;189(8):369, 2017 Aug.
[Is] ISSN:1573-2959
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The present research work is confined to a rural tract located in the north-western part of Birbhum district, West Bengal, India. Chemical analysis of the groundwater shows the cations is in the order of Na > Ca > Mg while for anions it is HCO > Cl > SO > NO . The F concentration was found to vary from 0.01 to 18 mg/L in the pre-monsoon and 0.023 to 19 mg/L in post-monsoon period. 86% of samples show low F content (<0.60 mg/L) whereas, 8% exhibit elevated concentration of F (>1.2 mg/L) mainly in the central and north-central parts of the study area at a depth of 46 to 98 m. The prime water type is CaHCO succeeded by F -rich NaHCO and NaCl waters. The suitability analysis reveals that the water at about 81% of the sampling sites is unsuitable for drinking and at 16% of sites unsuitable for irrigation. The alkaline nature of the water and/or elevated concentration of Fe, Mn and F make the water unsuitable for potable purposes while the high F and Na contents delimit the groundwater for irrigation uses. Multivariate statistical analysis suggests that chemical weathering along with ion exchange is the key process, responsible for mobilization of fluoride in groundwater of the study area.
[Mh] Termos MeSH primário: Irrigação Agrícola
Monitoramento Ambiental
Fluoretos/análise
Água Subterrânea/química
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Água Potável/química
Índia
Troca Iônica
Fosfatos
Análise de Componente Principal
Medição de Risco
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Drinking Water); 0 (Phosphates); 0 (Water Pollutants, Chemical); 15181-43-8 (fluorophosphate); Q80VPU408O (Fluorides)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170706
[St] Status:MEDLINE
[do] DOI:10.1007/s10661-017-6041-0


  9 / 3557 MEDLINE  
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[PMID]:28657214
[Au] Autor:Zhang Y; Parrondo J; Sankarasubramanian S; Ramani V
[Ad] Endereço:Center for Solar Energy and Energy Storage, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, MO, 63130, USA.
[Ti] Título:Detection of Reactive Oxygen Species in Anion Exchange Membrane Fuel Cells using In Situ Fluorescence Spectroscopy.
[So] Source:ChemSusChem;10(15):3056-3062, 2017 Aug 10.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The objectives of this study were: 1) to confirm superoxide anion radical (O ) formation, and 2) to monitor in real time the rate of O generation in an operating anion exchange membrane (AEM) fuel cell using in situ fluorescence spectroscopy. 1,3-Diphenlisobenzofuran (DPBF) was used as the fluorescent molecular probe owing to its selectivity and sensitivity toward O in alkaline media. The activation energy for the in situ generation of O during AEM fuel cell operation was estimated to be 18.3 kJ mol . The rate of in situ generation of O correlated well with the experimentally measured loss in AEM ion-exchange capacity and ionic conductivity attributable to oxidative degradation.
[Mh] Termos MeSH primário: Membranas Artificiais
Superóxidos/análise
Superóxidos/química
[Mh] Termos MeSH secundário: Troca Iônica
Espectrometria de Fluorescência
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Membranes, Artificial); 11062-77-4 (Superoxides)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170829
[Lr] Data última revisão:
170829
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170629
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201700760


  10 / 3557 MEDLINE  
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[PMID]:28640914
[Au] Autor:Shi X; Li Q; Wang T; Lackner KS
[Ad] Endereço:Department of Earth and Environmental Engineering, Columbia University, New York, NY, United States of America.
[Ti] Título:Kinetic analysis of an anion exchange absorbent for CO2 capture from ambient air.
[So] Source:PLoS One;12(6):e0179828, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:This study reports a preparation method of a new moisture swing sorbent for CO2 capture from air. The new sorbent components include ion exchange resin (IER) and polyvinyl chloride (PVC) as a binder. The IER can absorb CO2 when surrounding is dry and release CO2 when surrounding is wet. The manuscript presents the studies of membrane structure, kinetic model of absorption process, performance of desorption process and the diffusivity of water molecules in the CO2 absorbent. It has been proved that the kinetic performance of CO2 absorption/desorption can be improved by using thin binder and hot water treatment. The fast kinetics of P-100-90C absorbent is due to the thin PVC binder, and high diffusion rate of H2O molecules in the sample. The impressive is this new CO2 absorbent has the fastest CO2 absorption rate among all absorbents which have been reported by other up-to-date literatures.
[Mh] Termos MeSH primário: Absorção Fisico-Química
Ar/análise
Dióxido de Carbono/química
Dióxido de Carbono/isolamento & purificação
[Mh] Termos MeSH secundário: Troca Iônica
Cinética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
142M471B3J (Carbon Dioxide)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170918
[Lr] Data última revisão:
170918
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170623
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0179828



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