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Use of microwave irradiation for modification of mesoporous silica nanoparticles by thioglycolic acid for removal of cadmium and mercury

2017; Elsevier BV; Volume: 258; Linguagem: Inglês

10.1016/j.micromeso.2017.09.021

1873-3093

I. M. M. Kenawy, Yasmeen G. Abou El‐Reash, Mohamed M. Hassanien, N.R. Alnagar, Wael I. Mortada,

Gas Sensing Nanomaterials and Sensors

Herein, we report the organized investigation on adsorption of Cd(II) and Hg(II) by thioglycolic acid modified mesoporous silica nanoparticles prepared by the sol-gel procedure. The modification process is enhanced by microwave irradiation. The morphological behavior of the prepared sorbent (MCM-41-TgA) was identified by SEM and TEM imaging as well as BET surface area analysis. The proposed chemical properties were confirmed by elemental analysis, FT-IR, XRD, and zeta potential. EDX and FT-IR spectra were used to confirm the adsorption process. Both ions could be quantitatively recovered from aqueous samples at pH 6 after shaking for 30 min at room temperature. The solid phase has relatively high adsorption capacity 91.3 and 42.8 mg g−1 for Cd(II) and Hg(II), respectively. Langmuir isotherm model fitted well with the experimental data confirming the formation of a mono layer with homogeneous adsorption sites. The thermodynamic studies concluded spontaneity and exothermic behavior of the adsorption process. MCM-41-TgA could be regenerated using 0.5 mol L-11 thiourea or EDTA for at least 10 adsorption/desorption cycles, and it was applied to preconcentrate Cd(II) and Hg(II) from real samples before their determination using ICP-OES.