Abstract
Graphene oxide (GO) was synthesized and employed as an adsorbent for Zn(II) removal from an aqueous solution. The adsorption isotherms showed that Zn(II) adsorption can be better described using the Freundlich model than the Langmuir model. The maximum adsorption capacity of Zn(II) on GO determined using the Langmuir model at pH 7.0 and 293 K was 208.33 mg/g. The calculation of thermodynamic parameters revealed that the process of Zn(II) adsorption on GO was chemisorptions, endothermic, and spontaneous. Kinetic studies indicated that the pseudo-second-order kinetic model showed a better simulation of Zn(II) adsorption than the pseudo-first-order kinetic model. On the basis of surface complexation modeling, the double layer model provided a satisfactory prediction of Zn(II) by inner-sphere surface complexes (for example, SOZn+ and SOZnOH species), indicating that the interaction mechanism between Zn(II) and GO was mainly inner-sphere complexation. In terms of reusability, GO could maintain 92.23% of its initial capability after six cycles. These findings indicated that GO was a promising candidate for the immobilization and preconcentration of Zn(II) from aqueous solutions.
Highlights
E With the rapid development of agricultural and industrial activities, massive wastewater caused by heavy metal ions is generated
A initial capability after six cycles. These findings indicated that Graphene oxide (GO) was a promising candidate for the immobilization and preconcentration of Zn(II) from aqueous solutions
The sorption of Zn(II) on GO was irrelevant with ionic strength, revealing that the inner-sphere surface complexation dominated Zn(II) adsorption
Summary
E With the rapid development of agricultural and industrial activities, massive wastewater caused by heavy metal ions is generated. It is mandatory to decontaminate heavy metal ions to permissible limits (5 mg/L in drinking water according to The World Health Organization). Zn(II) removal from liquid has been investigated through chemical precipitation, ion exchange, membrane separation, adsorption, and coagulation [3,4,5,6]. Among these methods, the adsorption process is extensively considered as an effective and efficient approach due to its low cost, easy handing, the availability of various adsorbents, and its environment-friendly properties [1]. Ggasemi et al (2015) demonstrated that the maximum adsorption capacity of Zn(II)
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