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The Optimization Study of Direct Red 81 and Methylene Blue Adsorption on Naoh-Modified Rice Husk Publisher



Ashrafi SD1 ; Kamani H2 ; Mahvi AH1, 3, 4
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Science, Tehran, Iran
  2. 2. Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
  3. 3. National Institute of Health Research, Tehran University of Medical Science, Tehran, Iran
  4. 4. Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Science, Tehran, Iran

Source: Desalination and Water Treatment Published:2016


Abstract

The objectives of this investigation are to obtain optimal adsorption conditions for direct red 81 (DR81) and methylene blue (MB) from aqueous solution on NaOH-modified rice husk (NaOH-RH) using response surface methodology (RSM). A Box–Behnken design (BBD) statistical experimental design was used to investigate the adsorption of DR81 and MB on NaOH-RH. For DR81, pH (4–7), initial concentration of dye (25–125 mg/l), adsorbent dose (2–6 g/l) and for MB pH (7–10), initial concentration of dye (25–125 mg/l) and adsorbent dose (0.25–0.75 g/l) were selected as independent variables. The results showed that the predicted values for both dye adsorptions were close to the experimental values and were in a good agreement, on the other hand, the R2 values for DR81 (R2 = 0.9685) and MB (R2 = 0.9832) indicated that the regression is able to give a good predict of response for the adsorption process in the range studied. From the BBD predictions, the optimal conditions in the adsorption process for removing 54.04% of DR81 were found to be 25 mg/l initial dye concentration and 6 g/l adsorbent dose at pH 4. Also, removing 97.66% of MB was found to be 25 mg/l initial dye concentration and 0.595 g/l adsorbent dosage at pH 8.89. © 2014 Balaban Desalination Publications. All rights reserved.
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