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Optimization studies on the adsorption of Malachite green from quaternary
dye mixture using modified sawdust of locust bean tree

Journal of Environment & Biotechnology Research, Vol. 6, No. 1, Pages 128-136, January 2017

Abdulsalam A. Khadijat, Giwa A. Abdur-Rahim, F. Wewers, Arinkoola Akeem

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ABSTRACT

A novel study on optimization of biosorption of Malachite green dye from a mixture of four dyes onto acid-modified
sawdust of Parkia biglobosa was conducted. The Design of Experimental (DoE) and Response Surface (RS)
methodology, that provides detailed information from minimum number of experiment, was employed in this study
rather than the traditional one-variable-at-a-time technique which is both time consuming and cost ineffective.
The adsorbent was characterized using different methods. Four factors each from the mixture components
(malachite green, methylene blue, crystal violet and rhodamine B) and process parameters (adsorbent dose,
contact time, temperature and pH) were considered. A total of 64 duplicate batch runs were performed using
Crossed Composite design of experiment, and the results were analysed using Analysis of variance (ANOVA). The
model developed was predictive (standard deviation = 0.37; R2 = 0.974; adjusted R2 = 0.963 and predicted R2 =
0.945). The optimum conditions required for the adsorption (98.58 % removal) were 1.0 g dose of adsorbent at 60
oC, pH of 9.42 and contact time of 146 min.
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Journal of Environment and Biotechnology Research
Volume 6, Number 1, 2017, pp. 128-136
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