Adsorption of phenol and o-chlorophenol by mesoporous MCM-41
ABSTRACT Water pollution by toxic organic compounds is of concern and the demand for effective adsorbents for the removal of toxic compounds is increasing. Present work deals with the adsorption of phenol (PhOH) and o-chlorophenol (o-CP) on mesoporous MCM-41 material. The effect of surfactant template in MCM-41 on the removal of PhOH and o-CP was investigated. The comparison of adsorption of PhOH and o-CP on uncalcined MCM-41 (noted as MCM-41) and calcined MCM-41 (noted as C-MCM-41) was investigated. It was found that MCM-41 shows significant adsorption for PhOH and o-CP as compared to C-MCM-41, this may be because of the hydrophobicity created by surfactant template in the MCM-41. Batch adsorption studies were carried out to study the effect of various parameters like adsorbent dose, pH, initial concentration and the presence of co-existing ions. It was found that adsorption of PhOH and o-CP depends upon the solution pH as well as co-existing ions present in the aqueous solution. The equilibrium adsorption data for PhOH and o-CP was analyzed by using Freundlich adsorption isotherm model. From the sorption studies it was observed that the uptake of o-CP was higher than PhOH.
SourceAvailable from: Rachida Benhamou Hamacha[Show abstract] [Hide abstract]
ABSTRACT: Yellow dye (YD) adsorption was carried out on some mesoporous materials such as calcined and uncalcined Al-MCM-41. These two matrices were synthesized by variation of Si/Al molar ratio (20, 40 and 80) under thermal conditions. The obtained materials were characterized by various methods: XRD diffraction (XRD), nitrogen adsorption at 77 K, Fourier transformed infrared spectroscopy (FTIR) and energy dispersive spectroscopy by X-rays (EDX). Elimination of YD as a function of both pH and shaking, contacting time, and reaction temperature was studied. The uncalcined Al-MCM-41 had the highest adsorption capacities with adsorption rate of about 92%. Both the uncalcined and calcined materials which contain a very little amount of aluminum seem to have a high affinity toward YD molecules.Arabian Journal of Chemistry 08/2013; 290. DOI:10.1016/j.arabjc.2013.07.049 · 2.68 Impact Factor
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ABSTRACT: The present study offers an economic synthesis of Al-containing spherical mesoporous Al-MCM-41 material from coal fly ash by one step. The texture and composition of the samples were characterized by XRD, N2 adsorption, FE-SEM, TEM, FT-IR, and 27Al MAS NMR. As a catalyst, the effects of ethyl acetate to the diameter and sphericity of the samples have also been investigated. The results show that the sample Al-MCM-41-10 prepared at the amount of ethyl acetate value of 10 mL displays the largest BET surface area (525.0 m2/g) and pore volume (0.71 cm3/g). Using this material as adsorbent for methylene blue (MB) removal, the adsorption capacity reaches 277.78 mg/g. The effects of pH, contact time, initial adsorbate concentration and temperature were evaluated by batch of adsorption experiments. Adsorption kinetics and isothermal adsorption studies showed that the pseudo-first-order model and the Langmuir isotherm fitted the experimental data quite well, indicating that the MB adsorption onto Al-MCM-41-10 adsorbent should be monolayer and chemical adsorption with the surface reaction. Thermodynamic analysis indicated an exothermic nature of adsorption and a spontaneous and favorable process. Our present study shows an economic way to treat MB using the industrial solid waste of coal fly ash.Journal of the Taiwan Institute of Chemical Engineers 03/2015; DOI:10.1016/j.jtice.2015.02.014 · 2.64 Impact Factor
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ABSTRACT: In this work, nanoporous MCM-41 silicate was used for the Victoria blue adsorption and removal from the aqueous solutions. The properties of the synthesized MCM-41 were determined by X-ray diffraction analysis, transmission electron microscopy, and TGA analysis. The method is based on the adsorption of Victoria blue after passing on MCM-41 in a column. The adsorption with respect to contact time, pH, flow rate of sample, and initial concentration of analyte was investigated to provide more information about the adsorption characteristics of MCM-41. After adsorption of the dye, the concentrations of residual dye were determined by UV-Vis spectrophotometer. Adsorption process is well described by Langmuir and Temkin isotherms in comparison with Frundlich isotherm. Results suggested that the adsorption of Victoria blue on calcined MCM-41 was a spontaneous and endothermic process. The experimental data fitted very well with the pseudo-second-order kinetic model for Victoria blue onto calcined MCM-41. Adsorption capacity was found to be 192.3 mg g−1. The method was applied to the adsorption and removal of Victoria blue in different environmental water samples.Desalination and water treatment 02/2015; DOI:10.1080/19443994.2015.1005690 · 0.99 Impact Factor