Selective adsorption and separation of Cr(VI) by surface-imprinted microsphere based on thiosemicarbazide-functionalized sodium alginate

ABSTRACT

Cr(VI)-imprinting thiosemicarbazide–functionalized sodium alginate (IIPTSC@SA) microspheres were fabricated to achieve the good selective adsorption for Cr(VI) removal from aqueous solution containing multiple ions. The selective adsorption and reusability of IIPTSC@SA microsphere were intensively investigated. The results showed that the grafting conditions of thiosemicarbazide were optimized at 0.2 g of TSC at 60 °C for 5 h and the ion-imprinting conditions at 100 mL of 2 wt % glutaraldehyde at 60 °C for 6 h. IIPTSC@SA microspheres exhibited the maximum adsorption capacity of 252.5 mg/g and good selectivity to remove Cr(VI) from multi-ion coexisting water. The adsorption process complied with a monolayer adsorption by virtue of chemical interactions together with endothermic spontaneously. After eight adsorption–desorption, the adsorption capacity and selectivity of IIPTSC@SA microspheres remained relatively stable.

GRAPHICAL ABSTRACT

KEYWORDS:

• Functionalization
• ion-imprinting
• selective adsorption
• thiosemicarbazide
• sodium alginate

Disclosure statement

No potential conflict of interest was reported by the author(s).

Acknowledgements

Many thanks were given for the financial support by the National Natural Science Foundation of China (No. 51703202), Key Research and Development Program of Zhejiang Province (No. 2018C03004), China Postdoctoral Science Foundation (No. 2017M621975) and Zhejiang Postdoctoral Science Preferred Funding Project.

Additional information

Funding

This work was supported by China Postdoctoral Science Foundation: [Grant Number 2017M621975]; Key Research and Development Program of Zhejiang Province: [Grant Number 2018C03004]; National Natural Science Foundation of China: [Grant Number 51703202].