Comparison of the cadmium removal efficiency by two calcium phosphate powders
authors Rebelo, AHS; Ferreira, JMF
nationality International
journal JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
author keywords Cadmium removal; Tricalcium phosphate (beta-TCP); Hydroxyapatite (HAp); Water decontamination; Adsorption kinetics; Non-linear fitting
keywords NUTRIENT-DEFICIENT DIET; SYNTHETIC HYDROXYAPATITE; AQUEOUS-SOLUTIONS; SINGLE-METAL; IN-VITRO; CELLS; CD; REMEDIATION; SUFFICIENT; EXPRESSION
abstract Cadmium is a chemical element that finds application in many fields. As a consequence of the numerous human activities related to its wide spread applications, the environment gets contaminated. One of the most severe consequences happens in aquatic habitats. Cadmium removal from aqueous solution by many different materials has been studied. However, the limited ability of the existing models to fit the experimental data, determination of important parameters such as mass of extracted heavy metal per unit mass of decontaminant, or predict how fast the process will occur, such as adsorption kinetics constants, is still a concern. In this work, two models are used to fit the adsorption data gathered at different temperatures by two distinct decontaminant calcium phosphate (CaP) powders, hydroxyapatite (HAp) and tricalcium phosphate (beta-TCP). The fitting models are nonlinear forms of pseudo first-order adsorption kinetics and the pseudo second-order adsorption kinetics. Determination of important parameters of both models was performed for both HAp and b-TCP under each of the experimental conditions used. The results disclose very interesting adsorption properties of cadmium ions from aqueous media by b-TCP. (C) 2017 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 2213-3437
year published 2017
volume 5
issue 2
beginning page 1475
ending page 1483
digital object identifier (doi) 10.1016/j.jece.2017.02.020
web of science category Engineering, Environmental
subject category Engineering
unique article identifier WOS:000405369800019
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