Synthesis of new Zn-decorated metal-organic frameworks for enhanced removal of carcinogenic textile dye: Equilibrium and kinetic modeling studies
Document Type
Article
Publication Date
10-15-2021
Abstract
This paper describes the synthesis and characterization of Zn2+ decorated (adipic and terephthalic acid as linkers) piperazine-based metal-organic framework (P-MOFs) and their extraction behavior toward the Chicago sky blue (CSB) dye. The formation of Zn2+-decorated P-MOFs was confirmed by FT-IR spectroscopy, energy-dispersive spectroscopy, X-ray diffraction, BET surface area analysis and TGA. Adsorption behavior of the synthesized P-MOFs was explored through solid-phase adsorption (batch method) prior to UV-Vis spectrophotometric determination. Adsorption parameters, including adsorbent dosage, pH of solution, dye concentration, and time, were optimized. Excellent percentage removal of 94% and 95% for AP-Zn-MOF and TP-Zn-MOF, respectively, was achieved at pH 7.5. Kinetics studies indicated that the synthesized adsorbents AP-Zn-MOF and TP-Zn-MOF followed the pseudo-second-order rate model with R-2 value 0.9989. The Freundlich isotherm with high R-2 value as compared to Langmuir isotherm indicated that CSB adsorption for the synthesized MOFs follows multilayer adsorption.
Keywords
Piperazine, Chicago sky blue dye, Adsorption, Adipic acid, Terephthalic acid
Divisions
Science
Funders
Ministry of Higher Education (MOHE), Malaysia[FP033-2019],Higher Education Commission of Pakistan
Publication Title
Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering
Volume
56
Issue
12
Publisher
Taylor & Francis Inc
Publisher Location
530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA