Abstract
In order to remove Cu2+ from wastewater, a kind of microsphere adsorbent (SCDO) with high efficiency for Cu2+ adsorption was prepared by the microdrop condensation method, where chitosan (CTS) and sodium alginate (SA) were used as the matrix to crosslink β-cyclodextrin (β-CD) and zeolite (Zeo). The structure and properties of SCDO were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Upon that, the adsorption performance of SCDO for Cu2+ was studied, in which the effects of pH, initial concentration, dosage, adsorption time and temperature were investigated. The results showed that the removal rate of Cu2+ reached 97.08%, and the maximum adsorption capacity was 24.32 mg/g with the temperature at 30 °C, the dosage of SCDO at 12 g/L, the initial concentration of Cu2+ at 100 mg/L, the pH of the solution at 6.0 and the adsorption time at 120 min, respectively. The adsorption process of Cu2+ by SCDO occurred in accordance with quasi-second-order kinetics model and Langmuir adsorption isotherm. After four repeats of continuous adsorption and desorption, the regenerative removal rate of Cu2+ could still reach 84.28%, which indicated that SCDO had outstanding reusability.
Highlights
Copper is an essential trace element for life, but excessive copper is harmful to people, animals and plants
A kind of microsphere adsorbent (SCDO) with high efficiency for Cu2+ adsorption was prepared by microdrop condensation method, where chitosan (CTS) and sodium alginate (SA) are used as the matrix, to crosslinking β-cyclodextrin (β-CD) and zeolite (Zeo)
FTIR and X-ray photoelectron spectroscopy (XPS) analysis showed that groups such as -OH, -NH2 and -COOH were involved in the adsorption process of Cu2+
Summary
Copper is an essential trace element for life, but excessive copper is harmful to people, animals and plants. The principle of adsorption method is to use the porous structure of adsorbent and the physical properties of large surface area to adsorb pollutants in water, to achieve the purpose of removing heavy metals in water [5]. It is simple in operation, low in application cost and good in treatment effect, so it is widely used to remove heavy metal pollution in water. Sodium alginate is very hydrophilic, and can react with calcium in aqueous solution by ion exchange, and polymerize to form stable water-based gel balls [16] This spheroidization property makes it an ideal framework for the preparation of composite adsorbents. The adsorption process and mechanism of SCDO were investigated, which benefits the practical copper-containing wastewater treatment
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