نتایج جستجو برای: comparative adsorption

تعداد نتایج: 299412  

2016
Seo-Hyun Pak Yong-Woo Jeon

Vacuum swing adsorption (VSA) is a promising treatment method for volatile organic compounds (VOCs). This study focuses on a VSA process for regenerating activated carbon spent with VOCs, and then investigates its adsorption capacities. Toluene was selected as the test VOC molecule, and the VSA regeneration experiments results were compared to the thermal swing adsorption (TSA) process. Cyclic ...

Journal: :Journal of computational chemistry 2010
Amir Abbas Rafati Sayed Majid Hashemianzadeh Zabiollah Bolboli Nojini Negin Naghshineh

Adsorption of pure and mixtures of O(2) and N(2) on isolated single-walled carbon nanotube (SWCNT) have been investigated at the subcritical (77 K) and different supercritical (273, 293, and 313 K) temperatures for the pressure range between 1 and 31 MPa using (N,V,T) Monte Carlo simulation. Both O(2) and N(2) gravimetric storage capacity exhibit similar behaviors, gas adsorption is higher on o...

Journal: :Faraday discussions 2011
Steven Tedds Allan Walton Darren P Broom David Book

Porous materials adsorb H2 through physisorption, a process which typically has a rather low enthalpy of adsorption (e.g. ca. 4 to 7 kJ mol(-1) for MOFs), thus requiring cryogenic temperatures for hydrogen storage. In this paper, we consider some of the issues associated with the accurate characterisation of the hydrogen adsorption properties of microporous materials. We present comparative gra...

2013
N. C. Kothiyal NAVIN CHANDRA KOTHIYAL SUMIT SHARMA

In the present study, fruit capsule activated carbon (FCAC) of P-acerifolium and commercial grade activated charcoal (CAC) were used for the study of adsorption of chromium (Vl) from aqueous solution. The maximum adsorption took place in the pH range of 3-6 with in contact time of 180 minutes. The adsorption kinetic of chromium (Vl) analyzed by pseudo first-order and pseudo second-order kinetic...

Journal: :Chemphyschem : a European journal of chemical physics and physical chemistry 2012
Yu V Pleskov M D Krotova V V Elkin V P Varnin I G Teremetskaya A V Saveliev V G Ralchenko

A comparative study of benzene oxidation at boron-doped diamond (BDD) and nitrogenated nanocrystalline diamond (NCD) anodes in 0.5 M K(2)SO(4) aqueous solution is conducted by using cyclic voltammetry and electrochemical impedance spectroscopy. It is shown by measurements of differential capacitance and anodic current that during the benzene oxidation at the BDD electrode, adsorption of a react...

2016
O. A. Konovalova N. V. Kalacheva M. V. Trushin

A comparative study of the physical adsorption of RNAse A and RNAse Bacillus pumilis onto a negatively charged surface of mica, a hydrophobic surface of pyrolytic graphite and a surface of lipid layers of dipalmitoylphosphatidylcholine (DPPC) was performed by atomic force microscopy. It was found that microbial RNAse, unlike RNAse A, 1) is adsorbed onto the negatively charged surface of mica in...

2014
C. R. Gally G. S. Reis E. C. Lima G. L. Dotto

Comparative study of the removal of the dye Reactive Red 120 (RR-120) from aqueous effluents from textile industry using microalgae Spirulina platensis (SP) and commercial active carbon (AC) were carried out. The batch adsorption systems were evaluated with respect to pH, agitation time, temperature and initial concentration of the dye. The maximum adsorption capacity for dye RR-120 were found ...

2013
I. A. H. Schneider R. A. W. Dryfe E. P. L. Roberts A. K. Campen N. W. Brown

Intercalation imparts interesting features to the host graphite material. Two different types of intercalated compounds called (GIC-bisulphate or Nyex 1000 and GIC-nitrate or Nyex 3000) were tested for their adsorption capacity and ability to undergo electrochemical regeneration. It was found that Nyex 3000 showed comparatively slow kinetics along with reduced adsorption capacity to one half fo...

Journal: :Nanoscale 2013
Andrea Schlierf Huafeng Yang Elias Gebremedhn Emanuele Treossi Luca Ortolani Liping Chen Andrea Minoia Vittorio Morandi Paolo Samorì Cinzia Casiraghi David Beljonne Vincenzo Palermo

We study the mechanism of surface adsorption of organic dyes on graphene, and successive exfoliation in water of these dye-functionalized graphene sheets. A systematic, comparative study is performed on pyrenes functionalized with an increasing number of sulfonic groups. By combining experimental and modeling investigations, we find an unambiguous correlation between the graphene-dye interactio...

2009
Jérôme Roques Edouard Veilly Eric Simoni

Canister integrity and radionuclides retention is of prime importance for assessing the long term safety of nuclear waste stored in engineered geologic depositories. A comparative investigation of the interaction of uranyl ion with three different mineral surfaces has thus been undertaken in order to point out the influence of surface composition on the adsorption mechanism(s). Periodic DFT cal...

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