Adsorption of multi-bivalent heavy metal ions in aqueous solution onto aminopropyl-functionalized MCM-48 preparation by co-condensation

ABSTRACT

In this study, we successfully synthesized aminopropyl-functionalized MCM-48 (NH₂-MCM-48) using the one-pot co-condensation strategy, with the use of co-templates. Using X-ray diffraction (XRD), Fourier-transform infrared (FTIR), and scanning electron microscopy spectra (SEM), these findings proved that we bridged the amino groups on the mesoporous channel of MCM-48. Our results indicated that the maximum adsorption levels of Mn²⁺, Ni²⁺, Cu²⁺, Cd²⁺, and Pb²⁺ onto NH₂-MCM-48 were 63.3 mg/g, 74.1 mg/g, 96.2 mg/g, 158.7 mg/g, and 322.6 mg/g, respectively. Our results demonstrate that NH₂-MCM-48 could be used to remove Mn²⁺, Ni²⁺, Cu²⁺, Cd²⁺, and Pb²⁺ from wastewater.

KEYWORDS:

• Aminopropyl-functionalized MCM-48
• adsorption Isotherm
• heavy metals
• adsorption kinetics

Highlights

• Aminopropyl functional groups were creatively bridged on mesoporous channel of MCM-48 by co-condensation.

• NH₂-MCM-48 possessed superior removal efficiency towards multi-bivalent metal ions.

• NH₂-MCM-48 exhibited excellent reusability for metal ions in aqueous solution.

• Amino groups could facilitate bivalent metal irons adsorption by chemical interaction.

Acknowledgements

This research was supported by the National Natural Science Foundation of China (nos. 21775138) and the Department of Science &Technology of Zhejiang Province.

Competing financial interests

The authors declare no competing financial interests.