Adsorption of methyl tert-butyl ether (MTBE) from aqueous solution by porous polymeric adsorbents

Zhang

Int. J. Environ. Sci. Technol.

2010

AB STRACT:The adsorption of methyl tert-butyl ether by granular activated carbon was investigated. The experimental data were analyzed using the Freundlich isotherm and the Langmuir isotherm. Although equilibrium data were found to follow Freundlich isotherm model, it were fitted better by the Langmuir model with a maximum adsorption capacity of 204.1 mg/g. The kinetic data obtained at different concentrations were analyzed to predict the constant rate of adsorption using three common kinetic models: pseudo-first-order, pseudo-second-order equation and intraparticle diffusion equation. The pseudo-second-order model was suitable for describing the adsorption kinetics for the removal of methyl tert-butyl ether from aqueous solution onto granular activated carbon. Both the Lagergren first-order rate constant k 1 and pseudo-second-order rate constant k 2 decrease with increasing initial concentrations of methyl tert-butyl ether and the intraparticle diffusion rate constant k p shows the reverse characteristic. Analysis of sorption data using a boyd plot confirmed that external mass transfer is the main rate-limiting step at the initial stage of adsorption. Results illustrate that granular activated carbon is an effective adsorbent for methyl tert-butyl ether and also provide specific guidance into adsorption of methyl tert-butyl ether on granular activated carbon in contaminated groundwater.

Section: Adsorption Isotherm In Water Solutionsupporting

confidence: 91%

Adsorption of methyl tert-butyl ether using granular activated carbon: Equilibrium and kinetic analysis

Zhang

Int. J. Environ. Sci. Technol.

2010

Environmental Technology

“…The activated carbon used in this work is predominantly microporous, with a micropore area corresponding to 94.73% of the total surface area, and an average pore diameter of 20.04 Å. These values are in qualitative agreement with those reported by Ji et al [26] and Li et al Figure 2. FTIR spectrum of the mixed cellulose ester microfiltration membrane (pore diameter = 0.65 μm).…”

Section: Characterization Of Materialssupporting

confidence: 91%

Effects of coconut granular activated carbon pretreatment on membrane filtration in a gravitational driven process to improve drinking water quality

Silva

Yamaguchi

Lovato

et al. 2011

This study evaluates the performance of a polymeric microfiltration membrane, as well as its combination with a coconut granular activated carbon (GAC) pretreatment, in a gravitational filtration module, to improve the quality of water destined to human consumption. The proposed membrane and adsorbent were thoroughly characterized using instrumental techniques, such as contact angle, Brunauer-Emmett-Teller) and Fourier transform infrared spectroscopy analyses. The applied processes (membrane and GAC + membrane) were evaluated regarding permeate flux, fouling percentage, pH and removal of Escherichia coli, colour, turbidity and free chlorine. The obtained results for filtrations with and without GAC pretreatment were similar in terms of water quality. GAC pretreatment ensured higher chlorine removals, as well as higher initial permeate fluxes. This system, applying GAC as a pretreatment and a gravitational driven membrane filtration, could be considered as an alternative point-of-use treatment for water destined for human consumption.

“…Highly crystalline and confined Co nanoparticles (up to 49 wt%) can be realized inside the nanoporous carbon matrices this way. The synthesized Co/NPC particle composites show a strong magnetic response, which has been seldom recorded for magnetic nanoparticle carbon matrices (Table ) . The high nanoporosity and open pore network of the carbon matrix can facilitate fast molecular diffusion of MB molecules, as well as promote the accessibility of Co nanoparticles, with excellent adsorption performance.…”

Section: Resultsmentioning

confidence: 93%

Direct Synthesis of MOF‐Derived Nanoporous Carbon with Magnetic Co Nanoparticles toward Efficient Water Treatment

Torad

Ishihara

et al. 2014

Small

614

308

Nanoporous carbon particles with magnetic Co nanoparticles (Co/NPC particles) are synthesized by one-step carbonization of zeolitic imidazolate framework-67 (ZIF-67) crystals. After the carbonization, the original ZIF-67 shapes are preserved well. Fine magnetic Co nanoparticles are well dispersed in the nanoporous carbon matrix, with the result that the Co/NPC particles show a strong magnetic response. The obtained nanoporous carbons show a high surface area and well-developed graphitized wall, thereby realizing fast molecular diffusion of methylene blue (MB) molecules with excellent adsorption performance. The Co/NPC possesses an impressive saturation capacity for MB dye compared with the commercial activated carbon. Also, the dispersed magnetic Co nanoparticles facilitate easy magnetic separation.