High-Efficiency Adsorption of Cr(VI) and Mn(VII) from Wastewater by a Two-Dimensional Copper-Based Metal–Organic Framework
Yongmou Zeng, Xia Li, Yuhuan Chen, Shixiong Li
Abstract
High Resolution Image Download MS PowerPoint Slide Cr(VI) and Mn(VII) in industrial wastewater have certain toxicity, and they pose a threat to the environment and human health and safety. Metal–organic frameworks (MOFs) usually have rich adsorption sites and a large specific surface area. They can effectively adsorb Cr(VI) and Mn(VII) from wastewater. In this paper, a two-dimensional copper-based metal–organic framework, {[Cu·(4,4′-bpy) 2 ·(H 2 O)]·2(NO 3 )·6(H 2 O)·(CH 3 OH)} n ( 1 ), is synthesized by hydrothermal synthesis. The structure of 1 is characterized by Fourier transform infrared (IR) spectroscopy, single-crystal X-ray diffraction, element analysis, and X-ray photoelectron spectroscopy (XPS). The results showed that 1 had a two-dimensional network structure, and the specific surface area of the nanostructure was 67.63 m 2 /g. The nanostructure of 1 could efficiently adsorb Cr(VI) and Mn(VII) from wastewater. The adsorption properties of Cr(VI) and Mn (VII) of 1 showed that the optimal concentration of both adsorbents was 0.2 g/L. It has good adsorption performance in the pH range 4–8. The adsorption performance is the best when pH is 7, which can reach 145 and 83 mg/g, respectively.