A pyrazine based metal-organic framework for selective removal of copper from strongly acidic solutions

Abstract

● pz-UiO-66 was synthesized facilely by a solvothermal method.

● Efficient capture of copper from highly acidic solution was achieved by pz-UiO-66.

● pz-UiO-66 exhibited excellent selectivity and capacity for copper capture.

● Pyrazine-N in pz-UiO-66 was shown to be the dominant adsorption site.

The selective capture of copper from strongly acidic solutions is of vital importance from the perspective of sustainable development and environmental protection. Metal organic frameworks (MOFs) have attracted the interest of many scholars for adsorption due to their fascinating physicochemical characteristics, including adjustable structure, strong stability and porosity. Herein, pz-UiO-66 containing a pyrazine structure is successfully synthesized for the efficient separation of copper from strongly acidic conditions. Selective copper removal at low pH values is accomplished by using this material that is not available in previously reported metal–organic frameworks. Furthermore, the material exhibits excellent adsorption capacity, with a theoretical maximum copper uptake of 247 mg/g. As proven by XPS and FT-IR analysis, the coordination of pyrazine nitrogen atoms with copper ions is the dominant adsorption mechanism of copper by pz-UiO-66. This work provides an opportunity for efficient and selective copper removal under strongly acidic conditions, and promises extensive application prospects for the removal of copper in the treatment for acid metallurgical wastewater.

Graphical abstract

Keywords

Pyrazine / Metal-organic frameworks / Copper removal / Strong acidity / High selectivity

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