Ratna Kusumawardani, Mukhamad Nurhadi, W. Wirhanuddin, Rahmat Gunawan, Hadi Nur
The carbon-containing hydroxyapatite has been synthesized using the fish bone obtained from East Kalimantan, Indonesia. The synthesis was conducted at varying calcination temperature (300-700 °C) and duration time (1-5 h). The carbon-containing hydroxyapatite were characterized by using Nitrogen adsorption-desorption, Fourier transform infrared spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Thermogravi-metric analysis (TGA) and Differential thermal analysis (DTA). The carbon-containing hydroxyapatite nanopar-ticles consisted of the mesoporous structure with a specific surface area of 159 m2·g-1 and pore size of 44 Å. The carbon-containing hydroxyapatite nanoparticles were utilized as the adsorbent for the removal of methylene blue by varying the contact time, initial dye concentration, pH, adsorbent dosage and temperature. The maximum amount of adsorption capacity was 56.49 mg·g-1. The adsorption was well fitted with the Langmuir adsorption model (R2 ∼0.998) and the pseudo-second-order model. This indicated that the dye molecules were adsorbed on the surface-active site of carbon-containing hydroxyapatite via chemical binding, forming an adsorbate monolayer. Hence, the adsorption capability corresponds to the physical properties such as the surface area and pore volume of hydroxyapatite because the larger surface area consists of higher binding sites for the adsorption. Thermody-namic parameters, including the Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS), indicated that the ad-sorption of methylene blue onto the carbon-containing hydroxyapatite nanoparticles was spontaneous. Thus, car-bon-containing hydroxyapatite nanoparticles can be applied as a low-cost adsorbent for the treatment of industrial effluents that are contaminated with the methylene blue. © 2019 BCREC Group. All rights reserved.
Department of Chemical Education, Universitas Mulawarman, Kampus Gunung Kelua, Samarinda, East Kalimantan, 75119, Indonesia; Chemistry Department, Universitas Mulawarman, Kampus Gunung Kelua, Samarinda, East Kalimantan, 75119, Indonesia; Center for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, Johor Bahru, 81310, Malaysia; Central Laboratory of Minerals and Advanced Materials, Faculty of Mathematics and Natural Sciences, State University of Malang, Indonesia
