Abstract
Graphene oxide nanosheets (GONs)/carboxymethyl chitosan (CMC)/Fe3O4 magnetic composite microspheres (MCMs) were prepared by enclosing Fe3O4 particles with CMC and GONs in turn. The microstructures of GONs and GONs/CMC/Fe3O4 MCMs were characterized by FTIR, XRD, TEM, and SEM. The effects of GON content, pH value, and adsorption time on the adsorption capacity of the MCMs were investigated. The results show that the GONs/CMC/Fe3O4 MCMs have a greater specific surface area and a strong adsorption capacity for dye wastewater. Meanwhile, the adsorption mechanism was investigated, and the results accorded with the pseudo-second-order kinetic model and the Freundlich isotherm model. The search results indicate that GONs/CMC/Fe3O4 MCMs can be used to purify dye wastewater and has an important potential use in the practical purification of dye wastewater.
Highlights
Nowadays, the purification technology of wastewater containing dyes and metal ions has become a hot topic worldwide [1,2,3]
The structural of graphene oxide nanosheets (GONs) were characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), TEM, atomic force microscopy (AFM), and laser particle analyzer (LPA), and the tested
The results indicate that the X-ray diffraction (XRD) peaks of distributed in magnetic composite microspheres (MCMs) the intercalation of GONs and GONsuniformly have disappeared in because the XRDof patterns of MCMs, indicating that carboxymethyl chitosan (CMC)
Summary
The purification technology of wastewater containing dyes and metal ions has become a hot topic worldwide [1,2,3]. Several concurrent technologies are being developed for removing dyes and these metal ions from the wastewater: for example, adsorption, flocculation, membrane separation, biological degradation, reverse osmosis, and ion exchange [5,6,7,8,9] Among these technologies, adsorption is the most suitable method for dye wastewater due to its high efficiency, low cost, and simple process technology [10]. Adsorption is the most suitable method for dye wastewater due to its high efficiency, low cost, and simple process technology [10] Various traditional adsorbents, such as activated carbon [11], modified clay [12], kaolin [13], peanut hulls [14], and cashew nutshells [15], have been used previously for the removal of dyes from wastewater (Table 1). The development of a new adsorbent with a high adsorption capacity and greater adaptability as well as extraordinary regenerative ability is urgent
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