β-Cyclodextrin–graphene oxide–diatomaceous earth material: preparation and its application for adsorption of organic dye
In this work, a novel β-cyclodextrin–graphene oxide–diatomaceous earth material (β-CD-GO-DE) was prepared and its application as excellent adsorbent was carried out for adsorption of methylene blue in aqueous solution. The structure and morphology of β-CD-GO-DE material were evidenced using Fourier-transform-infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffractometer, and thermogravimetric analysis. The adsorption experiment for removal of methylene blue was investigated in detail. The highest adsorption efficiency can reach 98.5% at 0.02 g cm−3 dosage of β-CD-GO-DE, the temperature of 65 °C, and time of 3 h. Adsorption kinetics and adsorption isotherm were investigated. Pseudo-second-order kinetics model can describe the adsorption process appropriately. The adsorption isotherm data were simulated using Langmuir and Freundlich isotherm models and the results showed that the equilibrium data were fitted well with Langmuir isotherm model, the maximum adsorption capacity of methylene blue reached 110.50 mg g−1. The adsorbent has good regeneration performance. The proposed method shows that the β-CD-GO-DE could be applied to adsorb of methylene blue in wastewater with satisfactory result.
KeywordsGraphene oxide β-Cyclodextrin Diatomaceous earth Adsorption Methylene blue
This project was supported by the National Natural Science Foundation of China (U1507115) and the Innovation Program for Graduate Education of Jiangsu Province (KYLX_1063).