Microwave Conversion of Carbonate Hydroxyapatite and Its Adsorption of Cu2+ and Cd2+ from Wastewater

Abstract

Abstract: The domestic hen eggshell waste as raw material has been effectively utilized to produce flower-like carbonate hydroxyapatite (CHAP) by using microwave irradiation liquid-phase method with the help of ethylenedia-minetetraacetic acid (EDTA) as a complex agent. X-ray diffraction (XRD),fourier transform infrared spectroscopy (FTIR),and scanning electron microscope (SEM) were used to analyze the phase composition and morphology of CHAP. The influence of various parameters on adsorption process such as solution pH, contact time, amount of CHAP, and initial concentration of metal ions were studied at 25 ℃ to optimize the conditions for maximum adsorption. The results showed that the flower-like b-type CHAP can be prepared by the microwave-liquid-phase method. The removal efficiency of Cd²⁺ and Cu²⁺ by CHAP could reach 94 and 93.17%, respectively, when the initial Cd²⁺ and Cu²⁺ concentration was 50 mg·L^-1, the liquid/solid ratio was 3 and 2 g·L^-1, pH values was 6 and 7, and the adsorption time was 70 min. The kinetic equation corresponds to the pseudo second order and the equilibrium sorption data for at 25 ℃ could be described by the Langmuir isotherm models. Their correlation coefficients were 0.9880 and 0.9939,respectively. The highest values of Langmuir uptake were found for copper (40.98 mg·g^-1) and cadmium (35.59 mg·g^-1).

Key words: eggshell, microwave, carbonate hydroxyapatite, Cu²⁺, Cd²⁺, adsorption

CLC Number:

X703.1

XU Jiao, LIU Peng. Microwave Conversion of Carbonate Hydroxyapatite and Its Adsorption of Cu²⁺ and Cd²⁺ from Wastewater[J]. Journal of Qujing Normal University, 2020, 39(6): 34-39.

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Microwave Conversion of Carbonate Hydroxyapatite and Its Adsorption of Cu²⁺ and Cd²⁺ from Wastewater

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