Abstract
The adsorption of naphthalene on graphene oxide (GO) nanosheets in presence of Paecilomyces cateniannulatus (P. cateniannulatus) was conducted by the batch techniques. The morphology and nanostructure of GO were characterized by SEM, TEM, FTIR, XPS, and Raman. The adsorption kinetics indicated that the adsorption of naphthalene on GO and GO + P. catenlannulatus can be satisfactorily fitted pseudo-first-order and pseudo-second-order kinetic model, respectively. P. catenlannulatus inhibited the adsorption of naphthalene on GO at pH<4.0, whereas the increased adsorption was observed at pH>4.0. The adsorption of naphthalene on GO and GO + P. catenlannulatus can be better fitted by Langmuir and Freundlich model, respectively. The change in the conformation of GO was responsible to the increased adsorption of naphthalene by SEM and TEM images. According to FTIR analysis, naphthalene was absorbed by the oxygen-containing functional groups of GO, especially for –COOH. The finding in the study provides the implication for the preconcentration and removal of polycyclic aromatic hydrocarbons from environment cleanup applications.
Highlights
Graphene oxide (GO), as the precursor of graphene, exhibits the large number of hydroxyl and epoxy groups in the plane and a small amount of carboxyl and carbonyl group at the edge [1,2,3]
Based on the characteristic results, it was demonstrated that GO nanosheets presented a variety of oxygen-containing functional groups such as epoxy, carboxyl, carbonyl, and hydroxyl groups
The effect of P. catenlannulatus on the adsorption of naphthalene on GO was investigated by batch techniques
Summary
Graphene oxide (GO), as the precursor of graphene, exhibits the large number of hydroxyl and epoxy groups in the plane and a small amount of carboxyl and carbonyl group at the edge [1,2,3]. Wang et al [13] investigated that the high affinities of the PAHs to GO were attributed to the carboxyl groups attaching to the edges of GO. Li et al [20] found that the maximum adsorption capacity of P. catenlannulatus calculated from Langmuir model was 140.85 mg/g for Hg(II). Such high affinity for heavy metals was attributed to a variety of oxygen-containing functional groups such as amine, phosphoryl, carboxyl, and hydroxyl groups [21]. To the author’s knowledge, little information on the effect of P. catenlannulatus on the adsorption of organic contaminants is available
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