Effect of Paecilomyces cateniannulatus on the adsorption of nickel onto graphene oxide

Abstract

Graphene oxide (GO) was synthesized by chemical oxidation method and used to remove nickel (Ni(II)) from aqueous solutions in the presence of Paecilomyces cateniannulatus (P. cateniannulatus). Based on characteristic results, it was demonstrated that P. cateniannulatus was easily combined with carboxyl groups of GO by covalent bond. The adsorption results showed that P. cateniannulatus facilitated the adsorption of Ni(II) on GO over a wide range of pH. The maximum adsorption capacities of GO+P. cateniannulatus and GO calculated from Langmuir model at pH 4.0 and T=303 K were 104.2 and 81.3 mg·g −1 , respectively. According to the analysis of thermodynamic parameters, the adsorption of Ni(II) on GO+P. cateniannulatus was endothermic and spontaneous. The highlight of this study quantitatively assessed the effect of bacteria on the fate and transports of heavy metals in near-surface geologic systems.

Recent Advances in Applications of Hybrid Graphene Materials for Metals Removal from Wastewater

“…All the kinetic studies follow the pseudo-second order out of the five literature studies, four equilibrium models use the Langmuir isotherm, while one model, with a very low initial nickel (II), ion concentration of 5 mg/L, reports a Freundlich isotherm fit. The adsorption of nickel (II) is enhanced at pH 2.0-5.5 owing to the electrostatic force between the negatively charged graphene oxide and positively charged Nickel (II) ions [121]. At pH higher than 7.5, electrostatic repulsion occurs between the negatively charged Ni(II) and GO, which is why adsorption is greatly decreased at pH higher than 7.5 [121].…”

“…The adsorption of nickel (II) is enhanced at pH 2.0-5.5 owing to the electrostatic force between the negatively charged graphene oxide and positively charged Nickel (II) ions [121]. At pH higher than 7.5, electrostatic repulsion occurs between the negatively charged Ni(II) and GO, which is why adsorption is greatly decreased at pH higher than 7.5 [121]. The highest adsorption capacity is 344 mg/g with GO-SO x R@TiO 2 [71].…”