Efficient adsorptive removal of Congo red from aqueous solution by synthesized zeolitic imidazolate framework-8. Issue 1 (1st October 2016)

• Record Type: Journal Article
• Authors: Jiang, Canlan; Fu, Boming; Cai, Hao; Cai, Tianming
• Is Part Of: Chemical speciation and bioavailability. Volume 28:Issue 1/4(2016)
• Page Start: 199
• Page End: 208
• Publication Date: 2016-10-01
• Subjects: Zeolitic imidazolate framework-8 (ZIF-8) -- Congo red (CR) -- adsorption isotherm -- adsorption kinetic; Speciation (Chemistry) -- Periodicals; Pollutants -- Biodegradation -- Periodicals; 363.7384
• DOI: 10.1080/09542299.2016.1224983
• Languages: English
• ISSNs: 2047-6523

Abstract

Abstract: Dyes exposure in aquatic environment creates risks to human health and biota due to their intrinsic toxic mutagenic and carcinogenic characteristics. In this work, a metal-organic frameworks materials, zeolitic imidazolate framework-8 (ZIF-8), was synthesized through hydrothermal reaction for the adsorptive removal of harmful Congo red (CR) from aqueous solution. Results showed that the maximum adsorption capacity of CR onto ZIF-8 was ultrahigh as 1250 mg g −1 . Adsorption behaviors can be successfully fitted by the pseudo-second order kinetic model and the Langmuir isotherm equation. Solution conditions (pH condition and the co-exist anions) may influent the adsorption behaviors. The adsorption performance at various temperatures indicated the process was a spontaneous and endothermic adsorption reaction. The enhanced adsorption capacity was determined due to large surface area of ZIF-8 and the strong interactions between surface groups of ZIF-8 and CR molecules including the electrostatic interaction between external active sites Zn−OH on ZIF-8 -and −SO3 or –N=N– sites in CR molecule, and the π – π interaction.