Abstract
AbstractGraphene oxide hydrosol was added dropwise to the surface of chitosan (CS) to successfully obtain graphene oxide/chitosan composite (GC). The composite material was characterized by scanning electron microscopy and X-ray diffraction. The prepared adsorbent was used to simulate the static adsorption of copper, lead, and cadmium ions from 100 mL of 50 mg/L simulated wastewater samples. When the pH of the simulated wastewater is 6, initial dosage is 70 mg, adsorption time is 90 min, and temperature is 20°C; the adsorption capacities for copper, lead, and cadmium are 60.7, 48.7, and 32.3 mg/g, respectively. The adsorption and desorption cycle experiments show that the adsorption capacity of GC for copper ions can reach 86% of the initial adsorption capacity after ten cycles. The adsorption of lead ions on the composite conforms to the Freundlich adsorption isotherm model.
Highlights
In recent years, toxic heavy metal ions have widely been introduced into the aquatic environment due to the dumping of e-waste, the burning of fossil fuels, municipal waste treatment, mining and smelting, the application of chemical fertilizers and pesticides, and sewage [1]
GO loaded with CS has a large load dispersibility, which increases the specific surface area of graphene oxide/chitosan composite (GC), thereby increasing the reaction rate of the reactive functional groups on the composite with the copper, lead, and cadmium ions in the simulated wastewater sample, which is beneficial to improving the adsorption performance of the material
From the comparison of the diffraction angles of the two materials, it is obvious that the diffraction angle of GC is smaller than that of CS, which indicates that the GC is more crystalline compared to CS, thereby improving the adsorption performance of GC
Summary
Toxic heavy metal ions have widely been introduced into the aquatic environment due to the dumping of e-waste, the burning of fossil fuels, municipal waste treatment, mining and smelting, the application of chemical fertilizers and pesticides, and sewage [1]. Preparation and adsorption properties of GC 295 which can provide dynamic adsorption sites and can coordinate with heavy metal ions, so it can be used as a high-performance composite adsorbent for various heavy metal ions [26,27,28]. Some published reports on graphene oxide/ chitosan composites (GC) for wastewater adsorption treatment show that GC and GO composites have high stability and good mechanical properties [29,30,31,32,33]. Most studies are restricted to the study of the adsorption performance of a heavy metal ion, and there are relatively few reports on the treatment of multiple heavy metal ions in wastewater. When the contaminated water contains copper, lead and cadmium ions at the same time, the use of this material allows the adsorption process to proceed better
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