A detailed study on adsorption isotherms of Hg(II) removal from aqueous solutions using nanostructured sorbent ZnCl2-MCM-41. Issue 40 (26th August 2016)

• Record Type: Journal Article
• Authors: Raji, Foad; Pakizeh, Majid; Saraeian, Alireza; Raji, Mojtaba
• Is Part Of: Desalination and water treatment. Volume 57:Issue 40(2016)
• Page Start: 18694
• Page End: 18709
• Publication Date: 2016-08-26
• Subjects: Nanostructured sorbent -- ZnCl2-MCM-41 -- Hg(II) removal -- Non-linear regression -- Isotherm -- Adsorption capacity; Saline water conversion -- Periodicals; Saline water conversion; Water -- Purification; Periodicals; 628.167
• DOI: 10.1080/19443994.2015.1091997
• Languages: English
• ISSNs: 1944-3994

Abstract

Abstract: A comparison between linear and non-linear regression methods to determine the optimum isotherm was done by applying these models to the experimental equilibrium data of Hg(II) sorption using new nanostructured sorbent ZnCl2 –MCM-41. The best-fitting linear isotherm was selected based on the highest R 2 value obtained. In the case of non-linear methods, different error functions were employed to determine the best-fitting model. Langmuir isotherm was found to be the best-fitting model in both linear and non-linear cases, which implies a monolayer adsorption of Hg(II) onto a homogeneous surface of ZnCl2 –MCM-41. Scanning electron microscopic images verified the spherical morphology of the sorbent particles. The adsorption capacities of Hg(II) onto CaCl2 –MCM-41, CuCl2 –MCM-41, and MgCl2 –MCM-41 were demonstrated to be less than those of ZnCl2 –MCM-41. Lastly, Hg(II) recovery of up to 75% was obtained by utilizing 0.1 M HNO3 solution.