Application of magnetic Cd2+ ion-imprinted mesoporous organosilica nanocomposites for mineral wastewater treatment

作者：Cen, Shuibin; Li, Weiming; Xu, Shiying; Wang, Zhihong; Tang, Youwen^*; Wang, Haishui^*; Wei, Chaohai

来源：RSC Advances, 2017, 7(13): 7996-8003.

DOI：10.1039/c6ra27679b

• HEAVY-METAL IONS
• ONE-POT SYNTHESIS
• AQUEOUS-SOLUTION
• SELECTIVE RECOGNITION
• EFFICIENT REMOVAL
• FAST ADSORPTION
• SILICA SHELL
• NANOPARTICLES
• MICROSPHERES
• DELIVERY

This work demonstrates a simple strategy for producing highly selective adsorption magnetic ion imprinted mesoporous silica (MIIMS) nanocomposites. They have been functionalized by a g-(aminoethylamino) propyl chelating group for specific recognition and rapid removal of toxic heavy metal ions from wastewaters. The superparamagnetic Fe3O4 nanocrystal was encapsulated in an imprinted mesoporous organosilica shell via a co-condensation synthesis method. The results of transmission electron microscopy (TEM) and small angle X-ray diffraction (XRD) confirmed that the imprinted mesoporous organosilica shell preserved a highly ordered 2D mesostructure. The Brunauer-Emmett-Teller (BET) analysis found the surface area was 946 m(2) g(-1). The saturated adsorption capacity of MIIMS toward cadmium reached up to 25.2 mg g(-1) (0.224 mmol g(-1)) at pH 5.0. The adsorption of cadmium reached an equilibrium within 4.5 min. The results of a selectivity study revealed that the adsorption capacity for Cd2+ is much high than other co-existing heavy metal ions. The adsorption efficiency of MIIMS was above 94.2% after six extraction-stripping cycles. The MIIMS can efficiently remove cadmium ions in water treatment applications.

• 出版日期2017
• 单位华南理工大学