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Experimental Design and Response Surface Modeling for Optimization of Fluoroquinolone Removal From Aqueous Solution by Naoh-Modified Rice Husk Publisher



Ashrafi SD1 ; Kamani H2 ; Jaafari J1 ; Mahvi AH3, 4, 5, 6
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran
  2. 2. Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
  3. 3. Center for Water Quality Research (CWQR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran
  4. 4. School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  5. 5. Center for Solid Waste Research (CSWR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran
  6. 6. National Institute of Health Research, Tehran University of Medical Sciences, Tehran, Iran

Source: Desalination and Water Treatment Published:2016


Abstract

Abstract: The aim of this study is to obtain optimal adsorption conditions for enrofloxacin (ENR) as a fluoroquinolone antibiotic onto NaOH-modified rice husk using response surface methodology (RSM). On the basis of a four variable Box–Behnken design (BBD), RSM was used to determine the effect of adsorbent dose (0.25, 0.5, and 0.75 g L−1), pH (5, 7, and 9), ENR initial concentration (25, 75, and 125 mg L−1), and temperature (15, 30, and 45°C) on adsorption efficiency. By applying the quadratic regression analysis, among the main parameters, the removal efficiency was significantly affected by all the four variables. The results showed that the predicted values for ENR adsorption were close to the experimental values and were in good agreement. In addition, the R2 value (R2 = 0.9705) indicates that the regression is able to give a good predict of response for the adsorption process in the studied range. From the BBD predictions, the optimal conditions for 92.25% ENR removal were found to be 0.69 g L−1 of adsorbent dose, pH 5.11, and initial concentration of ENR 25.02 mg L−1, at temperature 36.43°C. © 2015 Balaban Desalination Publications. All rights reserved.
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