Abstract
As eco-friendly adsorption material, hydroxyapatite (Ca5(PO4)3OH, HA) has been extensively applied to the removal of heavy metal ions. However, separating and recovering of HA powder after the adsorption process limits their application. Alginate-based composite beads (HCA) encapsulated with HA and cellulose were designed to remove Cu(II) from aqueous solution. Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) were used for characteristic analysis. An extensive discussion in terms of HCA adsorption capacity, effect of various Cu(II) concentration, and analysis of the involved mechanisms of Cu(II) removal on the biosorption. HCA beads showed that the maximum adsorption capacity for Cu(II) of 64.14mg/g at pH = 5 with 8h contact time. The Langmuir adsorption isotherm and second-order kinetic model gave the closest fit. HCA beads display good regeneration ability after four cycles and offer potentiality for practical application.
Highlights
IntroductionEmission of heavy metals has raised increasing concern, due to their toxicity, carcinogenicity, and non-biodegradable in living organisms
Attendant with the growth of global industrialization and urbanization, water environment such as lakes and river have been polluted by human-mediated activities.Emission of heavy metals has raised increasing concern, due to their toxicity, carcinogenicity, and non-biodegradable in living organisms
To investigate the interaction between the Cellulose and Ha, CA and HCA, the prepared sample were characterized by Fourier-transform infrared spectroscopy (FTIR) spectra and X-ray diffraction (XRD) patterns
Summary
Emission of heavy metals has raised increasing concern, due to their toxicity, carcinogenicity, and non-biodegradable in living organisms. To address the problem of water pollution, many efficient strategies were used for the separation and purification of contained water, such as chemical precipitation(Ebrahimi et al 2017), membrane adsorption-based separation (Shalla et al 2019). Among these various techniques, adsorption is effective and widely used in water treatment because of the facile and low-cost operation (Joseph et al 2019). The inconveniently in separating these powder materials after adsorption process limit their application for water treatment
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