Table of Contents
ISRN Chemical Engineering
Volume 2014, Article ID 457868, 9 pages
Research Article

Arsenate Removal from Water by Simultaneous Green Tea Nano-Zerovalent Iron and Ultrasonic Wave

1Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan 63187 14331, Iran
2Environmental Technology Research Center, Jundishapur University of Medical Sciences, Ahwaz 61357 15751, Iran
3School of Public Health, Ahwaz Jndishapur University of Medical Sciences, Ahwaz 61357 15751, Iran

Received 21 February 2014; Accepted 23 March 2014; Published 9 April 2014

Academic Editors: K. Z. Elwakeel and S. Wang

Copyright © 2014 Abolfazl Ashouri et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Nano-zerovalent iron (NZVI) was synthesized using green tea (GT) extract and it was used as an adsorbent in arsenate removal from water. FESEM, PSD, and XRD employed in the examination of particles and their characterizations. Results showed that the particles were spherical lumped together in a texture structure with sizes ranging from 20 to 70 nanometers. All experiments were accomplished in a batch mode. Adsorption isotherm, adsorption kinetics, and the effects of pH, GT-NZVI dosage, and ultrasonic wave power on arsenate separation capabilities were explored. The results suggested that the arsenate removal efficiency enhanced with increasing GT-NZVI dosage. Increase in pH from 3 to approximately 6 leads to increase in the removal efficiency; however, increasing the pH further decreased the removal efficiency. The effect of ultrasonic power on As(V) removal was dependent on pH and NZVI dosages. The positive effect was more pronounced at low adsorbent dosages and acidic solution in which the As(V) removal efficiency improved with increasing ultrasonic power. However, in highly alkali solutions As(V) removal efficiency reduced with increasing ultrasonic power. The adsorption kinetics followed second order, while the adsorption isotherm was fitted best with Langmuir equation at a maximum capacity of 34.2 mg g−1.