Open AccessUtilization of Hydroxyapatite from Tuna Fish Bone Waste as Adsorbent for Cadmium from Aqueous Solutions
Author(s) -
Rizki Amalia Herawati,
M M Lahieb Faisal Faisal,
Mahidin Mahidin
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/845/1/012025
Subject(s) - adsorption , cadmium , calcination , fourier transform infrared spectroscopy , freundlich equation , nuclear chemistry , aqueous solution , chemistry , chemical engineering , organic chemistry , catalysis , engineering
This study aims to determine the performance of hydroxyapatite adsorbents from tuna bone waste against cadmium metal ion removal. Hydroxyapatite adsorbents have been activated physically (calcined at 500°C and 700°C) and chemically (using H 3 PO 4 ). The adsorbent was then characterized using Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). A batch experiment was conducted to study the effect of initial concentration and contact time on cadmium adsorption. The results of SEM and FTIR analysis showed that the best adsorbent was obtained from calcination results at 700°C. The observation shows that the contact time and initial concentration affect the efficiency of adsorption. The highest removal efficiency of cadmium was 86.28% with an adsorption capacity of 44.62 mg/g obtained at the contact time of 150 minutes and an initial concentration of cadmium 100 mg/L. The results of the isotherm study show that the adsorption equilibrium in the cadmium solution follows the Freundlich isotherm model with values R 2 = 0.923, N = 9.4339, and K F = 7.92. The adsorption kinetics of cadmium adsorption followed the pseudo-second-order equation with values of K 2 and q e at 0.021534 g.mg −1 .min −1 and 47.61 mg/g, respectively. The results obtained indicate that hydroxyapatite from tuna bone waste is a promising alternative for cadmium adsorption.