Biosorption of chromium(VI) ion from aqueous solutions using walnut, hazelnut and almond shell

Journal of Hazardous Materials
E Pehlivan, Türkan Altun

Abstract

The potential to remove Cr(VI) ion from aqueous solutions through biosorption using, the shells of Walnut (WNS) (Juglans regia), Hazelnut (HNS) (Corylus avellana) and Almond (AS) (Prunus dulcis) was investigated in batch experiments. The equilibrium adsorption level was determined to be a function of the solution contact time and concentration. Kinetic experiments revealed that the dilute chromium solutions reached equilibrium within 100 min. The biosorptive capacity of the shells was dependent on the pH of the chromium solution, with pH 3.5 being optimal. Adsorption of Cr(VI) ion uptake is in all cases pH-dependent showing a maximum at equilibrium pH values between 2.0 and 3.5, depending on the biomaterial, that correspond to equilibrium pH values of 3.5 for (WNS), 3.5 for (HNS) and 3.2 for (AS). The adsorption data fit well with the Langmuir isotherm model. The sorption process conformed to the Langmuir isotherm with maximum Cr(VI) ion sorption capacities of 8.01, 8.28, and 3.40 mg/g for WNS, HNS and AS, respectively. Percentage removal by WNS, HNS and AS was 85.32, 88.46 and 55.00%, respectively at a concentration of 0.5 mM. HNS presented the highest adsorption capacities for the Cr(VI) ion.

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Citations

Mar 7, 2012·Environmental Science and Pollution Research International·Linda B L LimMuhd Khairud Dahri
May 31, 2012·Environmental Science and Pollution Research International·M P Saravana Kumar, B R Phanikumar
Sep 18, 2012·Environmental Science and Pollution Research International·V K GuptaShikha Sharma
Nov 6, 2009·Environmental Technology·Yuru ChenTengfei Gu
Nov 5, 2013·Environmental Science and Pollution Research International·Bhupinder Dhir
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Mar 9, 2012·Colloids and Surfaces. B, Biointerfaces·Siti Khairunnisa YahyaWan Azlina Ahmad
Feb 19, 2011·Journal of Hazardous Materials·Namal Priyantha, Anushka Bandaranayaka
Aug 19, 2015·International Journal of Biological Macromolecules·Sadeek A SadeekMostafa M Abdel Wahab
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Jun 18, 2017·Environmental Science and Pollution Research International·Soma NagSudip Kumar Das
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