Cellulose-g-tetraethylenepentamine Dual-function Imprinted Polymers Selectively and Effectively Adsorb and Remove 4-Nitrophenol and Cr(VI)

2021 ◽  
Author(s):  
Daning Lang ◽  
Xia Xu ◽  
Ronglan Wu ◽  
WEI WANG ◽  
Ming Shi ◽  
...  
Keyword(s):  
Binary Systems ◽  
Competitive Adsorption ◽  
Dual Function ◽  
Imprint Polymer ◽  
Inorganic Contaminants ◽  
Cellulosic Material ◽  
Imprinted Polymer ◽  
Promising Candidate ◽  
Adsorption Sites ◽  
Amine Groups

Abstract A cellulosic material could efficiently and selectively adsorb organic and inorganic contaminants from aqueous solutions without interference from competing adsorption sites. In this study, cellulose-graft-tetraethylenepentamin molecular imprinted polymer (C-TEPA-MIP) was synthesized by using 4-nitrophenol (4-NP) as the template. The C-TEPA-MIP adsorbent could adsorb 4-NP and Cr(VI) simultaneously and selectively, without being affected by the competitive adsorption sites of each of these pollutants. The adsorption of 4-NP was predominantly due to the imprinted sites of 4-NP in C-TEPA-MIP that were located inside of the adsorbent, whereas that of Cr(VI) was primarily due to the amine groups of TEPA found on the surface of the adsorbent. Compared with the non-imprint polymer synthesized without the template, C-TEPA-MIP showed higher selectivity for both 4-NP and Cr(VI) in unitary and binary systems. In addition, C-TEPA-MIP exhibited good stability and recyclability for 4-NP, which makes it a promising candidate material for applications concerning wastewater treatment.

scholarly journals Molecular simulation of gases competitive adsorption in lignite and analysis of original CO desorption

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jing Zhang ◽  
Jiren Wang ◽  
Chunhua Zhang ◽  
Zongxiang Li ◽  
Jinchao Zhu ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Molecular Simulation ◽  
Competitive Adsorption ◽  
Air Leakage ◽  
Adsorption Characteristics ◽  
Adsorption Sites ◽  
Simulation Based ◽  
Lignite Coal ◽  
Model C ◽  
Grand Canonical

AbstractTo study the adsorption characteristics of CO, CO2, N2, O2, and their binary-components in lignite coal, reveal the influence of CO2 or N2 injection and air leakage on the desorption of CO in goafs, a lignite model (C206H206N2O44) was established, and the supercell structure was optimized under temperatures of 288.15–318.15 K for molecular simulation. Based on molecular dynamics, the Grand Canonical Monte Carlo method was used to simulate the adsorption characteristics and the Langmuir equation was used to fit the adsorption isotherms of gases. The results show that for single-components, the order of adsorption capacity is CO2 > CO > O2 > N2. For binary-components, the competitive adsorption capacities of CO2 and CO are approximate. In the low-pressure zone, the competitive adsorption capacity of CO2 is stronger than that of CO, and the CO is stronger than N2 or O2. From the simulation, it can be seen that CO2, N2 or O2 will occupy adsorption sites, causing CO desorption. Therefore, to prevent the desorption of the original CO in the goaf, it is not suitable to use CO2 or N2 injection for fire prevention, and the air leakage at the working faces need to be controlled.

Chemisorption of Ammonia on Silica

1973 ◽  
Vol 51 (11) ◽  
pp. 1771-1781 ◽  
Author(s):  
G. A. Blomfield ◽  
L. H. Little
Keyword(s):  
Adsorption Process ◽  
Ammonia Adsorption ◽  
Adsorption Sites ◽  
Added Water ◽  
Adsorption Of Water ◽  
Amine Groups

The interaction of ammonia with silicas prepared by a variety of methods was studied to resolve conflicting reports of the mode of ammonia adsorption and to determine the role of chlorine impurities (present in the silica) in the adsorption process. Results for the adsorption of water on silica assisted in making band assignments and competition between ammonia and water for silica adsorption sites was observed. It was concluded that dehydroxylated silicas contain sites which dissociate ammonia to form Si—NH2 groups having infrared bands at 3540, 3450, and 1550 cm−1 (the surface amine groups are not displaced by added water). The presence of chlorine in the silica is not a prerequisite for chemisorption of ammonia.

scholarly journals Electron transfer processes of coadsorbed Anthracene and N,N-Dimethylaniline on titania-silica

2004 ◽  
Vol 6 (1) ◽  
pp. 11-16 ◽  
Author(s):  
Anna Eremenko ◽  
Natalie Smirnova ◽  
Oksana Yakimenko ◽  
Galina Starukh ◽  
David R. Worrall ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Competitive Adsorption ◽  
Co Adsorption ◽  
Decay Kinetics ◽  
Electron Transfer Process ◽  
Adsorption Sites ◽  
Transfer Processes ◽  
Pure Silica ◽  
Electron Transfer Processes ◽  
Kinetics Of

The effect of titania-silica binaries on the processes of PET and the decay kinetics of the Anthracene (An) fluorescence and An radical cation in presence of the co-adsorbed electron donor N,Ndimethylaniline (DMA) has been studied. The fluorescence of excited An adsorbed on pure silica is quenched by the addition of DMA, while co-adsorption of DMA on Ti/Si binaries resulted in increase of fluorescence intensity of adsorbed An. We suggest that competitive adsorption between DMA and An results in DMA occupying more active “titania” sites causing the shift of An molecules to weaker adsorption sites located on the silica support. An and DMA molecules being adsorbed simultaneously on the surface, effectively produce reduced titanium ions due to an electron transfer process. These data appear to lend weight to the suggestion of a pre-exciplex An-DMA state on the surface and effective PET from the excited molecular pair to the acceptor sites on the surface. These sites may be titania aggregates, or titania ions when there is a low content of Ti in the binaries.

Competitive Adsorption of Lead, Copper and Zinc Ions on Polymeric Al/Fe Modified Clinoptilolite

2010 ◽  
Vol 156-157 ◽  
pp. 900-907 ◽  
Author(s):  
Hong Yu Wang ◽  
Hui Fei Huang
Keyword(s):  
Adsorption Capacity ◽  
Binary Systems ◽  
Competitive Adsorption ◽  
Metal Adsorption ◽  
Zinc Ions ◽  
Adsorption Capacities ◽  
Copper And Zinc ◽  
The Individual ◽  
Modified Clinoptilolite

The individual and competitive adsorption capacities of Pb2+, Cu2+ and Zn2+ on clinoptilolite and polymeric Al/Fe modified clinoptilolite were studied. In single systems, adsorption capacity of Pb2+ exceeded that of Cu2+ and Zn2+, and the adsorption capacities of Pb2+, Cu2+ and Zn2+ by polymeric Al/Fe modified clinoptilolite were greater than clinoptilolite. In binary isometric competition adsorption, adsorption capacities of Pb2+, Cu2+ and Zn2+ by clinoptilolite and polymeric Al/Fe modified clinoptilolite decreased compared with single systems. In binary non -isometric competition adsorption, adsorption of Zn2+ from solutions containing a fixed Zn2+ concentration was severely depressed (34%, 26% by clinoptilolite and polymeric Al/Fe (PAFC) modified clinoptilolite, respectively) by increasing the concentration of Cu2+ in the solution, but inverting the roles of Cu2+ and Zn2+ caused only a relatively minor reduction in adsorption of Cu2+. What,s more in other non-equal competition binary systems, the effect of metal adsorption was little. In general, the strength of adsorption followed the order of Pb2+ > Cu2+ > Zn2+ and the order of PAFC modified clinoptilolite > clinoptilolite.

scholarly journals Close Binary Systems in Globular Clusters: A Preliminary Report

1980 ◽  
Vol 88 ◽  
pp. 561-565 ◽  
Author(s):  
R. F. Webbink
Keyword(s):  
Globular Cluster ◽  
Preliminary Report ◽  
Globular Clusters ◽  
Binary Systems ◽  
Cataclysmic Variables ◽  
Eclipsing Binaries ◽  
Close Binary ◽  
Promising Candidate ◽  
Eclipsing Binary ◽  
Ursa Minor

A brief survey of known eclipsing binaries and cataclysmic variables in globular cluster fields is presented. None of the 47 known or suspected eclipsing variables is a promising candidate, although a very few remain possible members. V101 in M5 is a good candidate for membership, among 5 known or suspected dwarf novae. Three novae have been discovered in globular cluster fields, of which two are almost certainly members. Attention is also called to the eclipsing binary V80, a system which appears to contain an RRc variable, in the dwarf spheroidal galaxy in Ursa Minor.

scholarly journals Calculation of phase equilibria of the Ag-In-Sb system by the calphad method

2007 ◽  
Vol 61 (3) ◽  
pp. 152-156 ◽  
Author(s):  
Ivana Borisov ◽  
Dragan Manasijevic ◽  
Dragana Zivkovic
Keyword(s):  
Isothermal Section ◽  
Phase Equilibria ◽  
Thermodynamic Parameters ◽  
Binary Systems ◽  
Calphad Method ◽  
Promising Candidate ◽  
Vertical Sections ◽  
Free Solder

The ternary Ag-In-Sb system is a promising candidate for use as a Pb-free solder. The results of phase equilibria calculation by the CALPHAD method are presented in this study. The isothermal section at 400?C was calculated using optimized thermodynamic parameters of the constitutive binary systems. Calculated vertical sections from the indium and antimony corners were compared with the DTA results from this study and from the literature.

scholarly journals Tango of celestial dancers: A sample of detached eclipsing binary systems containing g-mode pulsating components

2020 ◽  
Vol 643 ◽  
pp. A162
Author(s):  
S. Sekaran ◽  
A. Tkachenko ◽  
M. Abdul-Masih ◽  
A. Prša ◽  
C. Johnston ◽  
...  
Keyword(s):  
Binary Stars ◽  
Binary Systems ◽  
Eclipsing Binaries ◽  
Stellar Structure ◽  
Chemical Compositions ◽  
Atmospheric Parameters ◽  
Promising Candidate ◽  
Primary Star ◽  
Frequency Spectra ◽  
Eclipsing Binary

Context. Eclipsing binary systems with components that pulsate in gravity modes (g modes) allow for simultaneous and independent constraints of the chemical mixing profiles of stars. The high precision of the dynamical masses and radii as well as the imposition of identical initial chemical compositions and equivalent ages provide strong constraints during the modelling of g-mode period-spacing patterns. Aims. We aim to assemble a sample of g-mode pulsators in detached eclipsing binaries with the purpose of finding good candidates for future evolutionary and asteroseismic modelling. In addition, we present a case study of the eclipsing binary KIC9850387, identified as our most promising candidate, and detail the results of the observational spectroscopic, photometric, and asteroseismic analysis of the system. Methods. We selected all of the detached eclipsing binaries in the Kepler eclipsing binary catalogue with Kepler Input Catalogue (KIC) temperatures between 6000 K and 10 000 K, and performed a visual inspection to determine the presence and density of g modes, and the presence of g-mode period-spacing patterns in their frequency spectra. We then characterised our sample based on their g-mode pulsational parameters and binary and atmospheric parameters. A spectroscopic follow-up of our most promising candidate was then performed, and the orbital elements of the system were extracted. We then performed spectral disentangling followed by atmospheric modelling and abundance analysis for the primary star. We utilised an iterative approach to simultaneously optimise the pulsational and eclipse models, and subsequently performed an analysis of the pressure- (p-) and g-mode pulsational frequencies. Results. We compiled a sample of 93 Kepler eclipsing binary stars with g-mode pulsating components and identified clear g-mode period-spacing patterns in the frequency spectra of seven of these systems. We also identified 11 systems that contained hybrid p- and g-mode pulsators. We found that the g-mode pulsational parameters and the binary and atmospheric parameters of our sample are weakly correlated at best, as expected for detached main-sequence binaries. We find that the eclipsing binary KIC9850387 is a double-lined spectroscopic binary in a near-circular orbit with a hybrid p- and g-mode pulsating primary with Mp = 1.66−0.01+0.01 M⊙ and Rp = 2.154−0.004+0.002 R⊙, and a solar-like secondary with Ms = 1.062−0.005+0.003 M⊙ and Rs = 1.081−0.002+0.003 R⊙. We find ℓ = 1 and ℓ = 2 period-spacing patterns in the frequency spectrum of KIC9850387 spanning more than ten radial orders each, which will allow for stringent constraints of stellar structure during future asteroseismic modelling.

Nanoporous NiSb to Enhance Nitrogen Electroreduction via Tailoring Competitive Adsorption Sites

2021 ◽  
pp. 2101126
Author(s):  
Guilan Fan ◽  
Wence Xu ◽  
Jinhan Li ◽  
Jia‐Liang Chen ◽  
Meng Yu ◽  
...  
Keyword(s):  
Competitive Adsorption ◽  
Adsorption Sites

scholarly journals Coordination Reactions and Noncovalent Interactions of Polyamines with Nucleotides in Binary Systems and with Nucleotides and Copper(II) Ion in Ternary Systems

2010 ◽  
Vol 2010 ◽  
pp. 1-13 ◽  
Author(s):  
Lechoslaw Lomozik ◽  
Anna Gasowska ◽  
Grzegorz Krzysko ◽  
Romualda Bregier-Jarzebowska
Keyword(s):  
Binary Systems ◽  
Noncovalent Interactions ◽  
Ternary Systems ◽  
Coordination Sites ◽  
Protonated Amine ◽  
Overall Stability ◽  
Methylene Groups ◽  
Amine Groups ◽  
Mode Of Coordination ◽  
Phosphate Groups

Interactions of nucleotides (AMP, CMP) and 1,2-diaminopropane (tn-1) or 2-methyl-1,2-diaminopropane (tn-2) in metal-free systems as well as in the systems including copper(II) ions were studied. The composition and overall stability constants of the complexes formed were determined by the potentiometric method, whereas the interaction centres and coordination sites were identified by spectroscopic methods. It was found that phosphate groups of nucleotides and the protonated amine groups of polyamines are the centres of interaction. The differences in the interactions with the polyamines which act as models of biogenic amines are impacted by the presence of lateral chains (methylene groups) in tn-1 and tn-2. In the ternary systems with Cu(II) ions, the heteroligand complexes are mainly of the ML⋯L’ type, in which the protonated polyamine is engaged in noncovalent interactions with the anchoring Cu(II)-nucleotide complex. The complexes formed in the Cu/NMP)/tn-1 system are more stable than those formed in the system with tn-2. The mode of coordination in the complex is realised mainly through the phosphate groups of the nucleotide with involvement of the endocyclic nitrogen atoms in a manner which depends upon the steric conditions and in particular on the number of the methylene groups in the polyamine molecule.

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