Biosorption of Cd from aqueous solutions by shrimp shell

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HAMIDPOUR M.; HOSSEINI N.; MOLAEI SH.

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Journal: Journal of Water and Soil Conservation Year:2018 | Volume:25 | Issue:1 Page(s): 257-269

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Title

Biosorption of Cd from aqueous solutions by shrimp shell

Author(s)

HAMIDPOUR M. | HOSSEINI N. | MOLAEI SH. | Issue Writer Certificate

Keywords

CadmiumQ2

Heavy metalsQ1

BiosorbentQ1

PollutionQ1

RemediationQ1

Abstract

Background and Objectives: Nowadays, extensive attention has been paid to removal and Remediation of Heavy metals from polluted sites. Biosorption is a cost-effective method for removing Heavy metals from aqueous solutions. In this study, biosorption of Cd has been examined by shrimp shell. Materials and Methods: The adsorption of Cd on shrimp shell was studied as a function of pH (Cd concentration: 8. 0 mg L-1) in the range of 3. 0-8. 0 and as a function of metal concentration (Cd concentration in the range of 15-100. 0 mg L-1) using a 24h batch equilibration experiments. The amounts of Cd adsorbed on the adsorbent were calculated from the difference between the metal concentration in the blank and equilibrium concentration of Cd in the solutions. Chemical species of Cd in the solutions was also predicted using Visual MINTEQ, a computer code developed to simulate equilibrium processes in aqueous systems. Infrared spectrums of untreated and Cd-loaded adsorbent were obtained using a Fourier transform infrared spectrometer. Results: The results of pH dependent experiments showed that the percent removal of Cd on the sorbent increased with the increase of suspension pH. The experimental data showed that shrimp shell used in this study removed more than 99% Cd from solution at pH=7. 5. The Freundlich and Langmuir isotherms were described satisfactorily equilibrium data. Maximum sorption capacity (qmax) of the sorbent was 5. 1 mg g-1. Pseudo second order kinetic model provided a perfect fit for the kinetic data of Cd sorption onto shrimp shell. Biosorption kinetics of Cd consisted of two steps: An initial rapid step where adsorption was very fast. The second phase is the gradual biosorption stage before the Cd uptake reached equilibrium. Based on the estimates obtained by Visual MINTEQ, the Cd2+ and Cd(OH)+ species were the dominant species present in solutions in pH≤ 8. 5 and pH≥ 8. 5, respectively. Infrared spectrum analysis of adsorbent before and after adsorption showed that the N atoms of the amine functional groups played a major role in shrimp shell for adsorption of Cd. Conclusion: Based on the results obtained for Cd removal by this sorbent, it may be concluded that shrimp shell is an effective adsorbent for Cd and may be considered for environmental Remediation in future studies.

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APA: Copy

HAMIDPOUR, M., HOSSEINI, N., & MOLAEI, SH.. (2018). Biosorption of Cd from aqueous solutions by shrimp shell. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 25(1 ), 257-269. SID. https://sid.ir/paper/156387/en

Vancouver: Copy

HAMIDPOUR M., HOSSEINI N., MOLAEI SH.. Biosorption of Cd from aqueous solutions by shrimp shell. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2018;25(1 ):257-269. Available from: https://sid.ir/paper/156387/en

IEEE: Copy

M. HAMIDPOUR, N. HOSSEINI, and SH. MOLAEI, “Biosorption of Cd from aqueous solutions by shrimp shell,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 25, no. 1 , pp. 257–269, 2018, [Online]. Available: https://sid.ir/paper/156387/en

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