Thermodynamics, kinetics and mechanism analysis of Cu(II) adsorption by in-situ synthesized struvite crystal

Abstract

Synthesized struvite was innovatively applied to removing Cu(II) from aqueous solution. The Cu(II) adsorption behavior and relative mechanisms were studied and analyzed. The maximum Cu(II) adsorption under pH=4.0 and 318 K calculated from adsorption thermodynamic analysis was 145.1 mg/g. The sorption kinetics can be favorably described by pseudo-second order model. The activation energy (E_a) of 17.5 kJ/mol suggested that the adsorption process was a chemical adsorption. The calculated thermodynamic parameters indicated that the adsorption was a spontaneous and endothermic one. On the basis of characterization upon struvite before and after adsorption, it was found that the electrostatic attraction and coordination bonding supported the ion sorption on struvite surface, and the transformation of copper ion into copper hydroxide occurred on struvite surface and within its crevices.

Keywords

struvite / heavy metal / chemical adsorption / coordination bonding / crystal synthesis

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