Tetracycline antibiotic removal from aqueous solutions by MOF-5: Adsorption isotherm, kinetic and thermodynamic studies. Issue 5 (October 2018)

• Record Type: Journal Article
• Authors: Mirsoleimani-azizi, Seyed Mohammad; Setoodeh, Payam; Zeinali, Sedigheh; Rahimpour, Mohammad Reza
• Is Part Of: Journal of environmental chemical engineering. Volume 6:Issue 5(2018)
• Page Start: 6118
• Page End: 6130
• Publication Date: 2018-10
• Subjects: MOF-5 -- Tetracycline antibiotic -- Design of experiments -- Adsorption -- Pharmaceutical wastewater treatment -- Aqueous solutions; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2018.09.017
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Time-varying removal of aqueous tetracycline (TC) by MOF-5 is studied. A two-step experimental design is performed to examine the operative factors. More than 96% TC removal is achieved applying model-based optimization in practice. Langmuir isotherm is found to be the best model fitted to the equilibrium data. The both physisorption and chemisorption mechanisms are denoted in this process. Abstract: This study examines time-varying adsorption of aqueous tetracycline (TC) by metal-organic framework, MOF-5. The employed MOF-5 is firstly synthesized under room temperature condition. Its structural, chemical, and physical features are then determined applying FTIR, XRD, SEM, TGA, N2 adsorption, and TEM characterization techniques. Cubic arrangement, 84.3% crystallinity, up to 450 °C thermal stability and approximately 2510 m 2 /g BET surface area with the both micro- and meso-cavities are its revealed characteristics. The impacts of the operative factors (adsorbent dosage, contact time, initial TC concentration, initial pH and temperature) on TC removal efficiency are examined following a two-step experimental design procedure (two-level categorical screening followed by response surface methodology for correlative model development). Additionally, to define the most appropriate condition/conditions, model-based optimization is implemented and verified in practice (more than %96 TC removal is achieved). Further thermodynamic and kinetic assessments respectively signify the both physisorption (Langmuir adsorption isotherm with maximum capacity of 233 mg/g) and chemisorption (pseudo-second-order model) mechanisms in this adsorption system. To sum up, MOF-5 as a suitable adsorbing agent will possibly have significant effects on pharmaceutical wastewater treatment and can be considered for advanced studies as an appropriate candidate regarding practicable remediation techniques.