Abstract:

This comprehensive experiment has successfully introduced the frontier of scientific research into undergraduate laboratory teaching. A magnetic Co/C nanocomposite was synthesized by using ZIF-67 as the precursor. Upon calcination at high temperature in inert atmosphere, ZIF-67 was degraded and carbonized to form Co/C nanocomposite. The adsorption performance of Co/C nanocomposite for Congo Red was investigated in detail. The structure and composition of the nanocomposite were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The concentration of Congo Red was determined by UV-Vis spectrophotometry. The kinetics data was fitted with the pseudo-first-order and pseudo-second-order kinetic models. The adsorption isotherms were analyzed according to Langmuir and Freundlich isotherm models. This experiment covers the synthesis of inorganic-organic hybrid material, characterization of materials, concentration determination of dyes, analysis of dynamics data and adsorption isotherms. Therefore, this experiment enables students to practice their experimental skills, increase their interest in scientific research, and broaden their professional knowledge.

Key words: MOFs, Magnetic nanocomposite, Congo Red, Adsorption, Organic contaminants