Synthesis of thiol-functionalized MCM-41 mesoporous silicas and its application in Cu(II), Pb(II), Ag(I), and Cr(III) removal
Source abstract
Abstract
Thiol-functionalized MCM-41 mesoporous silicas were synthesized via evaporation-induced self-assembly. The mesoporous silicas obtained were characterized by X-ray diffraction (XRD), nitrogen adsorption–desorption analysis, Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The products were used as adsorbents to remove heavy metal ions from water. The mesoporous silicas (adsorbent A) with high pore diameter (centered at 5.27 nm) exhibited the largest adsorption capacity, with a BET surface area of 421.9 m2 g−1 and pore volume of 0.556 cm3 g−1. Different anions influenced the adsorption of Cu(II) in the order NO3− < OAc− < SO42− < CO32− < Cit− < Cl−. Analysis of adsorption isotherms showed that Cu2+, Pb2+, Ag+, and Cr3+ adsorption fit the Redlich–Peterson nonlinear model. The mesoporous silicas synthesized in the work can be used as adsorbents to remove heavy metal ions from water effectively. The removal rate was high, and the adsorbent could be regenerated by acid treatment without changing its properties.
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Research context
OpenAlex topics: Adsorption and biosorption for pollutant removal · Mesoporous Materials and Catalysis · Covalent Organic Framework Applications
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