Removal of Congo red dye from aqueous solution with nickel-based metal-organic framework/graphene oxide composites prepared by ultrasonic wave-assisted ball milling

Shuaiqi Zhao; Ding Chen; Fuhua Wei; Nini Chen; Zhao Liang; Yun Luo

doi:10.1016/j.ultsonch.2017.06.013

Removal of Congo red dye from aqueous solution with nickel-based metal-organic framework/graphene oxide composites prepared by ultrasonic wave-assisted ball milling

Ultrason Sonochem. 2017 Nov:39:845-852. doi: 10.1016/j.ultsonch.2017.06.013. Epub 2017 Jun 17.

Authors

Shuaiqi Zhao¹, Ding Chen², Fuhua Wei¹, Nini Chen¹, Zhao Liang¹, Yun Luo¹

Affiliations

¹ College of Materials Science and Engineering, Hunan University, Changsha 410082, China.
² College of Materials Science and Engineering, Hunan University, Changsha 410082, China. Electronic address: ma97chen@hotmail.com.

PMID: 28733014
DOI: 10.1016/j.ultsonch.2017.06.013

Abstract

Metal-organic frameworks (MOFs) were successfully synthesized by ultrasonic wave-assisted ball milling. In the absence of organic solvent, the coupling effect of ultrasonic wave and mechanical force played an significant role in the synthesis of MOFs. Adsorption of Congo red (CR) was studied in view of adsorption kinetic, isotherm and thermodynamics. The adsorbent was carried out using X-ray diffraction (XRD), thermogravimetric analysis (TGA), N₂ adsorption-desorption isotherms, Raman spectroscopy and scanning electron microscope (SEM) methods. It was found that pseudo-second-order kinetic model and Freundlich adsorption isotherm matched well for the adsorption of CR onto nickel-based metal-organic framework/graphene oxide composites (Ni-MOF/GO). The results of the adsorption thermodynamics indicated that the adsorption process was a spontaneous and endothermic process. The adsorption capacity of graphene oxide/metal-organic frameworks (GO/MOFs) for CR reached 2489mg/g, much higher than previous reports. It was demonstrated that an increase in the number of active metal sites can dramatically improve the adsorption capacity of dye. A suitable dry temperature is beneficial for the improvement of adsorption capacity for dye. In this paper, the adsorption results indicated that ultrasonic wave-assisted ball milling has a good prospect for synthesis of MOFs with excellent adsorption performance.

Keywords: Adsorption removal; Congo red; Metal-organic framework (MOF); Ultrasonic wave-assisted ball milling.