A detailed study on adsorption isotherms of Hg(II) removal from aqueous solutions using nanostructured sorbent ZnCl2-MCM-41

作者：Raji Foad^*; Pakizeh Majid; Saraeian Alireza; Raji Mojtaba

来源：Desalination and Water Treatment, 2016, 57(40): 18694-18709.

DOI：10.1080/19443994.2015.1091997

• Nanostructured sorbent
• ZnCl2-MCM-41
• Hg(II) removal
• Non-linear regression
• Isotherm
• Adsorption capacity

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 0.1M HNO3 solution.

• 出版日期2016