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Adsorption of toxic metal ion Cr(VI) from aqueous state by TiO2-MCM-41: equilibrium and kinetic studies.
J Hazard Mater. 2012 Nov 30; 241-242:395-403.JH

Abstract

This paper deals with the immobilization of various weight percentage of TiO(2) on mesoporous MCM-41, characterization of the materials by X-ray diffraction (XRD), nitrogen adsorption-desorption, Fourier Transform Infrared (FTIR) analysis, UV-vis diffuse reflectance spectroscopy (DRS) and evaluation of the adsorption capacity toward Cr(VI) removal. It is found that the MCM-41 structure retained after loading of TiO(2) but the surface area and pore diameter decreased due to pore blockage. Adsorption of Cr(VI) from aqueous state was investigated on TiO(2)-MCM-41 by changing various parameters such as pH, metal ion concentration, and the temperature. When TiO(2) loading was more than 20 wt.%, the adsorption activity (25)TiO(2)-MCM-41 reduced significantly due to considerable decrease in the surface area. It is also observed that TiO(2) and neat MCM-41 exhibits very less Cr(VI) adsorption compared to TiO(2)-MCM-41. The adsorption of Cr(VI) onto (20)TiO(2)-MCM-41 at pH~5.5 and temperature 323 K was 91% at 100mg/L Cr(VI) metal ion concentration in 80 min. The experimental data fitted well to Langmuir and Freundlich isotherms. The adsorption of Cr(VI) on TiO(2)-MCM-41 followed a second order kinetics with higher values of intra-particle diffusion rate. Thermodynamic parameters suggested that the adsorption process is endothermic in nature and desorption studies indicated a chemisorption mode.

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Authors+Show Affiliations

Parida K
Colloids and Material Chemistry Department, Institute of Minerals and Materials Technology (CSIR), Bhubaneswar 751013, Odisha, India. paridakulamani@yahoo.com
Mishra KG
No affiliation info available
Dash SK
No affiliation info available

MeSH

AdsorptionChromiumHydrogen-Ion ConcentrationKineticsModels, TheoreticalSilicon DioxideSpectroscopy, Fourier Transform InfraredSurface PropertiesThermodynamicsTime FactorsTitaniumWater Pollutants, ChemicalWater PurificationX-Ray Diffraction

Pub Type(s)

Journal Article

Language

eng

PubMed ID

23092612

Citation

Parida, Kulamani, et al. "Adsorption of Toxic Metal Ion Cr(VI) From Aqueous State By TiO2-MCM-41: Equilibrium and Kinetic Studies." Journal of Hazardous Materials, vol. 241-242, 2012, pp. 395-403.
Parida K, Mishra KG, Dash SK. Adsorption of toxic metal ion Cr(VI) from aqueous state by TiO2-MCM-41: equilibrium and kinetic studies. J Hazard Mater. 2012;241-242:395-403.
Parida, K., Mishra, K. G., & Dash, S. K. (2012). Adsorption of toxic metal ion Cr(VI) from aqueous state by TiO2-MCM-41: equilibrium and kinetic studies. Journal of Hazardous Materials, 241-242, 395-403. https://doi.org/10.1016/j.jhazmat.2012.09.052
Parida K, Mishra KG, Dash SK. Adsorption of Toxic Metal Ion Cr(VI) From Aqueous State By TiO2-MCM-41: Equilibrium and Kinetic Studies. J Hazard Mater. 2012 Nov 30;241-242:395-403. PubMed PMID: 23092612.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Adsorption of toxic metal ion Cr(VI) from aqueous state by TiO2-MCM-41: equilibrium and kinetic studies. AU - Parida,Kulamani, AU - Mishra,Krushna Gopal, AU - Dash,Suresh Kumar, Y1 - 2012/09/29/ PY - 2012/03/04/received PY - 2012/09/23/revised PY - 2012/09/24/accepted PY - 2012/10/25/entrez PY - 2012/10/25/pubmed PY - 2013/4/26/medline SP - 395 EP - 403 JF - Journal of hazardous materials JO - J Hazard Mater VL - 241-242 N2 - This paper deals with the immobilization of various weight percentage of TiO(2) on mesoporous MCM-41, characterization of the materials by X-ray diffraction (XRD), nitrogen adsorption-desorption, Fourier Transform Infrared (FTIR) analysis, UV-vis diffuse reflectance spectroscopy (DRS) and evaluation of the adsorption capacity toward Cr(VI) removal. It is found that the MCM-41 structure retained after loading of TiO(2) but the surface area and pore diameter decreased due to pore blockage. Adsorption of Cr(VI) from aqueous state was investigated on TiO(2)-MCM-41 by changing various parameters such as pH, metal ion concentration, and the temperature. When TiO(2) loading was more than 20 wt.%, the adsorption activity (25)TiO(2)-MCM-41 reduced significantly due to considerable decrease in the surface area. It is also observed that TiO(2) and neat MCM-41 exhibits very less Cr(VI) adsorption compared to TiO(2)-MCM-41. The adsorption of Cr(VI) onto (20)TiO(2)-MCM-41 at pH~5.5 and temperature 323 K was 91% at 100mg/L Cr(VI) metal ion concentration in 80 min. The experimental data fitted well to Langmuir and Freundlich isotherms. The adsorption of Cr(VI) on TiO(2)-MCM-41 followed a second order kinetics with higher values of intra-particle diffusion rate. Thermodynamic parameters suggested that the adsorption process is endothermic in nature and desorption studies indicated a chemisorption mode. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/23092612/Adsorption_of_toxic_metal_ion_Cr_VI__from_aqueous_state_by_TiO2_MCM_41:_equilibrium_and_kinetic_studies_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(12)00976-4 DB - PRIME DP - Unbound Medicine ER -