Tags

Type your tag names separated by a space and hit enter

Removal of chromium by riverbed sand from water and wastewater: effect of important parameters.
J Hazard Mater. 2008 Mar 01; 151(2-3):789-93.JH

Abstract

Application of riverbed sand, a non-toxic substance for the removal of Cr(VI) for aqueous solutions has been investigated. Removal of Cr(VI) was dependent on initial concentration and removal increased from 43.2% to 74.3% by decreasing initial concentration from 7.5x10(-5) M to 1.0x10(-5) M at 25 degrees C, 1.0x10(-2) M NaClO4 ionic strength and 100 rpm. Higher removal was obtained at particles of smaller sizes of the adsorbent. Removal decreased from 74.3% to 40.7% by increasing temperature from 25 degrees C to 35 degrees C exhibiting exothermic nature of the process of removal. Thermodynamic parameters, namely change in free energy (DeltaG degrees), enthalpy (DeltaH degrees) and entropy (DeltaS degrees), were calculated and were found to be -0.81 kcal mol(-1), -17.21 kcal mol(-1) and 56.94 cal mol(-1), respectively at 25 degrees C. pH of the solution has pronounced effect on the removal and higher removal was obtained in acidic pH ranges, maximum (74.3%) being at 2.5 pH.

Authors+Show Affiliations

Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi 221005, India. y_sharma_2002@rediffmail.comNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17656013

Citation

Sharma, Y C., et al. "Removal of Chromium By Riverbed Sand From Water and Wastewater: Effect of Important Parameters." Journal of Hazardous Materials, vol. 151, no. 2-3, 2008, pp. 789-93.
Sharma YC, Singh B, Agrawal A, et al. Removal of chromium by riverbed sand from water and wastewater: effect of important parameters. J Hazard Mater. 2008;151(2-3):789-93.
Sharma, Y. C., Singh, B., Agrawal, A., & Weng, C. H. (2008). Removal of chromium by riverbed sand from water and wastewater: effect of important parameters. Journal of Hazardous Materials, 151(2-3), 789-93.
Sharma YC, et al. Removal of Chromium By Riverbed Sand From Water and Wastewater: Effect of Important Parameters. J Hazard Mater. 2008 Mar 1;151(2-3):789-93. PubMed PMID: 17656013.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal of chromium by riverbed sand from water and wastewater: effect of important parameters. AU - Sharma,Y C, AU - Singh,B, AU - Agrawal,A, AU - Weng,C H, Y1 - 2007/06/19/ PY - 2007/03/16/received PY - 2007/06/14/revised PY - 2007/06/14/accepted PY - 2007/7/28/pubmed PY - 2008/5/20/medline PY - 2007/7/28/entrez SP - 789 EP - 93 JF - Journal of hazardous materials JO - J Hazard Mater VL - 151 IS - 2-3 N2 - Application of riverbed sand, a non-toxic substance for the removal of Cr(VI) for aqueous solutions has been investigated. Removal of Cr(VI) was dependent on initial concentration and removal increased from 43.2% to 74.3% by decreasing initial concentration from 7.5x10(-5) M to 1.0x10(-5) M at 25 degrees C, 1.0x10(-2) M NaClO4 ionic strength and 100 rpm. Higher removal was obtained at particles of smaller sizes of the adsorbent. Removal decreased from 74.3% to 40.7% by increasing temperature from 25 degrees C to 35 degrees C exhibiting exothermic nature of the process of removal. Thermodynamic parameters, namely change in free energy (DeltaG degrees), enthalpy (DeltaH degrees) and entropy (DeltaS degrees), were calculated and were found to be -0.81 kcal mol(-1), -17.21 kcal mol(-1) and 56.94 cal mol(-1), respectively at 25 degrees C. pH of the solution has pronounced effect on the removal and higher removal was obtained in acidic pH ranges, maximum (74.3%) being at 2.5 pH. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/17656013/Removal_of_chromium_by_riverbed_sand_from_water_and_wastewater:_effect_of_important_parameters_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(07)00913-2 DB - PRIME DP - Unbound Medicine ER -