کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4987350 | 1455152 | 2017 | 17 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Fabrication and characterization of novel macroporous Jeffamine/diamino hexane cryogels for enhanced Cu(II) metal uptake: Optimization, isotherms, kinetics and thermodynamic studies Fabrication and characterization of novel macroporous Jeffamine/diamino hexane cryogels for enhanced Cu(II) metal uptake: Optimization, isotherms, kinetics and thermodynamic studies](/preview/png/4987350.png)
- Cryogels of Jeffamine/diamino hexane have been synthesized and optimized.
- Reductive amination performed to enhance the functional groups of cryogels.
- Cu(II) ion adsorption was studied and optimized via response surface modeling.
- Cryogels were characterized by FTIR, 13C NMR, SEM-EDX and compression analyses.
- Reusability studies were conducted and proved efficient for four adsorption cycles.
In this study, the role of optimized Jeffamine/diamino hexane reduced cryogel for Cu(II) ion removal from aqueous solutions was investigated. The synthesized adsorbent was characterized by means of FTâIR, 13C NMR, SEMâEDX and compression techniques. Maximum adsorption for Cu(II) ions was obtained at pH 5.5. The impact of several operating parameters such as metal ion concentration, adsorbent dosage, and temperature were elucidated and optimized by central composite design model of response surface methodology. Maximum adsorption capacity was determined as 119.13 mg/g at obtained optimum experimental conditions of initial Cu(II) ion concentration (100 mg/L), adsorbent dosage (80 mg) and temperature (55 °C). The isotherm and kinetic data revealed that the Langmuir and pseudo 2nd-order models to be in good agreement with the experimental data. Evaluation of adsorption mechanism by intraâparticle diffusion and Boyd model suggested that particle diffusion was the rate limiting step for Cu(II) ion uptake and was mainly due to external mass transport. Thermodynamic parameters Gibbs free energy (ÎG°) and enthalpy (ÎH°) confirmed the spontaneity and endothermicity of the adsorption process. Theoretical calculations suggested that both physisorption and chemisorption were active processes. Performed consecutive four cycles also show that the cryogel is a good alternative with high reusability and cost-friendly properties.
Journal: Chemical Engineering Research and Design - Volume 117, January 2017, Pages 122-138