Enhanced methyl green adsorption of ZIF-8 metal-organic framework: Insights from different solvents

This study investigates the effect of solvent type on the structural properties and adsorption performance of the ZIF-8 metal-organic framework for removing various dyes including, methyl green (MG), methylene blue (MB), and methyl orange (MO) from water in acidic and alkaline environments. ZIF-8 samples were synthesized using zinc nitrate, methylimidazole, and three different solvents including, water, methanol, and ethanol under atmospheric pressure and 70 °C. Characterization using BET, XRD, FT-IR, and TGA techniques sheds light on the structural, chemical, and thermal properties of ZIF-8 samples. Among the samples, ZIF-8/M, synthesized using methanol, stands out, demonstrating the high surface area of 2172.7 m2/g, large total pore volume of 1.5412 cm3/g, and high crystallinity of 31.9% with improved thermal stability. Furthermore, ZIF-8/M shows better adsorption performance for methyl green with a removal percentage of 81.9%, 87.1%, and an adsorption capacity of 20.5 mg/g and 21.8 mg/g, in acidic and alkaline environments, respectively. Enhanced dye adsorption of ZIF-8/M is associated with both physical and effective chemical adsorption mechanisms via tuning the environment's acidity.This study investigates the effect of solvent type on the structural properties and adsorption performance of the ZIF-8 metal-organic framework for removing various dyes including, methyl green (MG), methylene blue (MB), and methyl orange (MO) from water in acidic and alkaline environments. ZIF-8 samples were synthesized using zinc nitrate, methylimidazole, and three different solvents including, water, methanol, and ethanol under atmospheric pressure and 70 °C. Characterization using BET, XRD, FT-IR, and TGA techniques sheds light on the structural, chemical, and thermal properties of ZIF-8 samples. Among the samples, ZIF-8/M, synthesized using methanol, stands out, demonstrating the high surface area of 2172.7 m2/g, large total pore volume of 1.5412 cm3/g, and high crystallinity of 31.9% with improved thermal stability. Furthermore, ZIF-8/M shows better adsorption performance for methyl green with a removal percentage of 81.9%, 87.1%, and an adsorption capacity of 20.5 mg/g and 21.8 mg/g, in acidic and alkaline environments, respectively. Enhanced dye adsorption of ZIF-8/M is associated with both physical and effective chemical adsorption mechanisms via tuning the environment's acidity.

Enhanced methyl green adsorption of ZIF-8 metal-organic framework: Insights from different solvents Keywords:

ZIF-8 , Metal-organic framework , Solvent effect , Dye adsorption , Methyl green