Abstract
In this study, carbonated hydroxyapatite (CHA) nanorods were prepared by a novel hydrothermal method. The crystallinity and chemical structure of synthesized CHA nanorods was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS), respectively. Carmine was selected as representative organic dyes to study the adsorption capacities of CHA nanorods. Mechanistic studies of carmine adsorption by CHA nanorods show that the adsorption processes both follow the pseudo-second-order kinetic model and fit the Langmuir isotherm model well. The CHA nanorods exhibited a high adsorption capacity of 85.51 mg/g for carmine at room-temperature. The experimental results prove that CHA nanorods can be promising absorbents for removing organic dye pollutants in wastewater from paper and textile plants.
Highlights
Organic dyes widely exist in the effluent from paper and textile industrial wastewater and can cause serious environmental problems and damages to human health [1,2]
In the typical hydrothermal synthesis of carbonated hydroxyapatite (CHA) nanorods, Ca(NO3)2·4H2O and (NH4)2HPO4 were used as calcium source and phosphorus source, respectively
Ethylene Diamine Tetraacetic Acid (EDTA) and Cetyltrimethyl Ammonium Bromide (CTAB) served as templates for CHA nanorods
Summary
Organic dyes widely exist in the effluent from paper and textile industrial wastewater and can cause serious environmental problems and damages to human health [1,2]. Hydroxyapatite (HA) and its composites have been extensively studied for its applications in removing heavy metal ions such as Pb2+, Hg2+, Cd2+ and ampicillin in wastewater treatment [3,4,5]. Because of its excellent adsorption effect, HA has been used to remove metal ions and organic compounds from industrial wastewater. Doping HA with carbonate ions can effectively enhance the absorption efficiency by increasing specific surface areas and active sites on an apatite surface [6]. Doping different ions in apatite lattice has been proved to be an effective way to enhance the absorption efficiency of HA [8]. Several templates including polydopamine [9], carbon spheres [10], and anodic aluminum oxide (AAO) [11], polyvinyl pyrrolidone (PVP) [12], polyethylene glycol (PEG) [13], and Ethylene Diamine Tetraacetic Acid (EDTA) [14] have been used to synthesize HA nanoparticles with different crystal shape and surface morphologies
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
