Adsorption behavior of Fe (III) in aqueous solution on melamine | Zendy

Hao Peng | Zendy; Jing Guo | Zendy; Bingqing Wang | Zendy

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Adsorption behavior of Fe (III) in aqueous solution on melamine

Author(s) -

Hao Peng,

Jing Guo,

Bingqing Wang

Publication year - 2020

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2020.455

Subject(s) - adsorption , physisorption , melamine , endothermic process , enthalpy , chemistry , aqueous solution , exothermic reaction , gibbs free energy , standard enthalpy of reaction , order of reaction , inorganic chemistry , chemical engineering , thermodynamics , kinetics , reaction rate constant , organic chemistry , physics , engineering , quantum mechanics

This paper focused on the adsorption behavior of Fe (III) in aqueous solution on melamine. The effects of experimental conditions including dosage of melamine, reaction time and reaction temperature were investigated. The results showed that nearly 99% Fe (III) was adsorbed under the optimal conditions: melamine dosage (mole ratio) at n(C 3 H 6 N 6 )/n(Fe) = 3.5:1, reaction time of 60 min and reaction temperature of 90 °C. The optimal processing factors were obtained from response surface methodology and the effects of processing parameters on the removal efficiency of Fe (III) followed the order: mole ratio (n(C 3 N 6 H 6 ):n(Fe)) > reaction temperature > reaction time. The adsorption kinetics behavior was fitted well with the pseudo-second-order model. The thermodynamic study showed that the adsorption process was unspontaneous and endothermic. The value of free energy change and standard enthalpy change disclosed that the mechanism of adsorption onto melamine was physisorption. The results will be useful for further applications of system design in the treatment of practical waste effluents.

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