Tween 80 Modified Hydroxyapatite as an Adsorbent for Removal of Copper from Aqueous Solution
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Published:2019-09-01
Issue:9
Volume:11
Page:1305-1312
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ISSN:1941-4900
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Container-title:Nanoscience and Nanotechnology Letters
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language:en
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Short-container-title:nanosci nanotechnol lett
Author:
Bi Yongguang,Lu Yanshan,Di Liu ,Liu Xuemei
Abstract
Hydroxyapatite was in this study modified with Tween 80 through ultrasound assisted chemical precipitation method. The Tween-modified hydroxyapatite (T-HA) was characterized by some analytical methods. T-HA particles were rod-shaped with an average length of 59 nm. The effect of contact
time, pH, temperature, adsorbent dosage and initial concentration of Cu2+ on adsorption capacity were studied to determine the capacity of T-HA to adsorb copper ions. The removal efficiency for Cu2+ reached maximum (82.68%), at an initial concentration of Cu2+
of 200 mg/L and adsorbent dosage of 0.1 g at 35 °C for two hours reaction. The adsorption mechanism was determined by pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic models, while the equilibrium isotherms was fitted by Langmuir, Freundlich and Dubinin-Radushkevich (D-R)
models. Our data can best be described by a PSO kinetic model (R
2 = 0.99971) and D-R model (R
2 = 0.9377), suggesting a chemisorption mechanism. Application of Langmuir isotherm model (R
2 = 0.99337) indicated that Cu2+ was adsorbed
on T-HA as a monolayer. These results demonstrated that the Tween-modified hydroxyapatite is a promising material for environmental remediation of copper ions in waste water.
Publisher
American Scientific Publishers
Subject
General Materials Science