Adsortion of phenol and o-chlorophenol by mesoporous MCM-41

Environmental Materials Unit, National Environmental Engineering Research Institute (CSIR), Nagpur 440 020, India.
Journal of Hazardous Materials (Impact Factor: 4.53). 12/2008; 160(2-3):414-21. DOI: 10.1016/j.jhazmat.2008.03.013
Source: PubMed


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.

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    • "The removal of organic contaminants from groundwater has become the major focus of research and policy debate on separation of contaminants contained in polluted waters. This is because their presence even at low concentrations can prove an impediment to the use (and/or) reuse of water [1]. Phenols are among the most common pollutants of wastewater that require careful treatment before they are discharged into the receiving body of waters [2]. "
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    ABSTRACT: In this study, the removal characteristics of phenol from aqueous solution by the live Aspergillus niger were investigated under various operating variables like contact time, initial phenol concentration, biomass dosage, and temperature. The biosorption of phenol reached equilibrium in 48 h. The maximum loading capacity of the sorbent was also found to be 30.0 mg/g for live A. niger at an initial phenol concentration of 550 mg/L. Kinetic evaluation of experimental data showed that the biosorption of phenol on A. niger conformed closely to the intra particle diffusion model. Langmuir and Freundlich models were applied to describe the biosorption isotherms. Akaike’s information criterion (AIC) values were calculated for Langmuir (6.54) and Freundlich (12.45) isotherms, respectively. Having a smaller AIC value suggests that Langmuir isotherm is more likely to be a better fit. Thermodynamic parameters such as standard Gibbs free energy (ΔG°), standard enthalpy (ΔH°), and standard entropy (ΔS°) were obtained by applying the Van’t Hoff equation. The thermodynamics parameters indicated that the biosorption was spontaneous and endothermic. This research showed that fungal biosorption has a potential to be used in the removal of phenol from wastewaters.
    Desalination and water treatment 10/2015; DOI:10.1080/19443994.2015.1102088 · 1.17 Impact Factor
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    • "According to studies, the carboxylic and keto groups of NFX tends to complex with metal ion [24] [25]. What's more, the surface of incinerated MCM-41 contains large amounts of Si–OH, which make it difficult for hydrophobic compound to be adsorbed [22]. So we deduced that, on one hand, the introduction of Fe element could strengthen the hydrophobicity of MCM-41, on the other hand, it could also accelerate the formation of complex between NFX and Fe-MCM-41. "
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    • "For the same Si/ Al ratio (80%), the adsorption capacities increased from 23% at pH 2 to 67% at pH 10 (Fig. 8(A)). Mangrulkar et al., 2008 when studying the adsorption of phenol and o-chlorophenol by mesoporous MCM-41, found that uncalcined MCM-41 shows significant adsorption for PhOH and o-CP as compared to calcined MCM-41, and they "
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    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.
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