Investigation of Benzoic Acid Adsorption on to ODTMA-Bentonite by Response Surface Optimization

The adsorption of benzoic acid on to a modified bentonite (ODTMA-bentonite) was studied. ODTMA-bentonite was synthesized by the incorporation of a quaternary ammonium surfactant (octadecyltrimethylammonium bromide) on to Ç ankiri sodium bentonite (Ç Na-B) with a cation-exchange capacity of 85 mequiv...

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Main Authors: H. Kapucu, N. Yildiz, R. Gönülşen, A. Ç Çalimli
Format: Article
Language:English
Published: Hindawi - SAGE Publishing 2002-10-01
Series:Adsorption Science & Technology
Online Access:https://doi.org/10.1260/026361702321104237
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spelling doaj-6fa1e90d8d5841dcbb9dd109ec71b1762021-04-02T12:43:40ZengHindawi - SAGE PublishingAdsorption Science & Technology0263-61742048-40382002-10-012010.1260/026361702321104237Investigation of Benzoic Acid Adsorption on to ODTMA-Bentonite by Response Surface OptimizationH. Kapucu0N. Yildiz1R. Gönülşen2A. Ç Çalimli3 Pak Gida Üretim ve Pazarlama A.Ş., POB 149, 41001 İzmit, Kocaeli, Turkey Department of Chemical Engineering, Faculty of Engineering, Ankara University, 06100 Tandoǧan-Ankara, Turkey Department of Chemical Engineering, Faculty of Engineering, Ankara University, 06100 Tandoǧan-Ankara, Turkey Department of Chemical Engineering, Faculty of Engineering, Ankara University, 06100 Tandoǧan-Ankara, TurkeyThe adsorption of benzoic acid on to a modified bentonite (ODTMA-bentonite) was studied. ODTMA-bentonite was synthesized by the incorporation of a quaternary ammonium surfactant (octadecyltrimethylammonium bromide) on to Ç ankiri sodium bentonite (Ç Na-B) with a cation-exchange capacity of 85 mequiv/100 g clay. A 2 4 full factorial central composite experimental design followed by multi-stage Monte-Carlo optimization was used in designing the experiments and analyzing the results. This procedure limited the number of actual experiments performed whilst allowing for possible interactions between the four parameters studied. These parameters were temperature (20–40°C), agitation rate (30–170 rpm), the amount of organobentonite used (0.1–1.5 g) and the initial benzoic acid concentration (40–200 mg/l). Of these parameters, the amount of organobentonite and the temperature had significant effects in comparison with the agitation rate and initial benzoic acid concentration. To effect the maximum adsorption of benzoic acid on to ODTMA-bentonite, the optimum values for the tested variables over the selected ranges were as follows: initial concentration of benzoic acid = 200 mg/l, agitation rate = 170 rpm, amount of organobentonite = 1.5 g and temperature = 40°C. The coefficient of determination (R 2 ) for the model employed was 0.99343 with a probability value of 9.44 × 10 −14 (p-value < 0.01). This p-value indicates a very high significance for the regression model. The maximum adsorbed concentration of benzoic acid predicted by the equation (169.05 mg/l) agreed well with the value (163 mg/l) obtained from the experimental data measured under optimum conditions.https://doi.org/10.1260/026361702321104237
collection DOAJ
language English
format Article
sources DOAJ
author H. Kapucu
N. Yildiz
R. Gönülşen
A. Ç Çalimli
spellingShingle H. Kapucu
N. Yildiz
R. Gönülşen
A. Ç Çalimli
Investigation of Benzoic Acid Adsorption on to ODTMA-Bentonite by Response Surface Optimization
Adsorption Science & Technology
author_facet H. Kapucu
N. Yildiz
R. Gönülşen
A. Ç Çalimli
author_sort H. Kapucu
title Investigation of Benzoic Acid Adsorption on to ODTMA-Bentonite by Response Surface Optimization
title_short Investigation of Benzoic Acid Adsorption on to ODTMA-Bentonite by Response Surface Optimization
title_full Investigation of Benzoic Acid Adsorption on to ODTMA-Bentonite by Response Surface Optimization
title_fullStr Investigation of Benzoic Acid Adsorption on to ODTMA-Bentonite by Response Surface Optimization
title_full_unstemmed Investigation of Benzoic Acid Adsorption on to ODTMA-Bentonite by Response Surface Optimization
title_sort investigation of benzoic acid adsorption on to odtma-bentonite by response surface optimization
publisher Hindawi - SAGE Publishing
series Adsorption Science & Technology
issn 0263-6174
2048-4038
publishDate 2002-10-01
description The adsorption of benzoic acid on to a modified bentonite (ODTMA-bentonite) was studied. ODTMA-bentonite was synthesized by the incorporation of a quaternary ammonium surfactant (octadecyltrimethylammonium bromide) on to Ç ankiri sodium bentonite (Ç Na-B) with a cation-exchange capacity of 85 mequiv/100 g clay. A 2 4 full factorial central composite experimental design followed by multi-stage Monte-Carlo optimization was used in designing the experiments and analyzing the results. This procedure limited the number of actual experiments performed whilst allowing for possible interactions between the four parameters studied. These parameters were temperature (20–40°C), agitation rate (30–170 rpm), the amount of organobentonite used (0.1–1.5 g) and the initial benzoic acid concentration (40–200 mg/l). Of these parameters, the amount of organobentonite and the temperature had significant effects in comparison with the agitation rate and initial benzoic acid concentration. To effect the maximum adsorption of benzoic acid on to ODTMA-bentonite, the optimum values for the tested variables over the selected ranges were as follows: initial concentration of benzoic acid = 200 mg/l, agitation rate = 170 rpm, amount of organobentonite = 1.5 g and temperature = 40°C. The coefficient of determination (R 2 ) for the model employed was 0.99343 with a probability value of 9.44 × 10 −14 (p-value < 0.01). This p-value indicates a very high significance for the regression model. The maximum adsorbed concentration of benzoic acid predicted by the equation (169.05 mg/l) agreed well with the value (163 mg/l) obtained from the experimental data measured under optimum conditions.
url https://doi.org/10.1260/026361702321104237
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