Comparison Of Different RSM Designs To Predict And Optimize The Acid Violet (AV 7) Adsorption Using RHA-CFA Adsorbent
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Date
2021-06-01
Authors
Mohamad, Ahmad Aqil Asyraaf
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
In this study, the factors affecting the performance of rice husk ash (RHA)-coal fly ash
(CFA) adsorbent in removing acid violet 7 (AV7) dye were analysed using different type of
response surface methodology (RSM). Face-Centered Composite Design, D-Optimal Design and
Historical Data Design were compared based on the R2 value, Mean Square Error (MSE) and error
in optimization section (%). DOD had the highest accuracy (R2 = 0.9765) in predicting dye
adsorption efficiency, while FCC and HDD have lower accuracy but still in good value range (R2
= 0.9335). By using Expert Design software, the optimum RHA-CFA adsorbent preparation
condition with the highest AV7 dye adsorption efficiency was obtained through the numerical
optimization of RSM models. Optimization by FCC and HDD, maximum adsorption efficiency
obtained were 45.1% and DOD was 44.4% with RHA/CFA ratio of 3.00 and 1.00 M of NaOH. An
additional experiment of RHA/CFA ratio of 3.00 and 1.00 M of NaOH is obtained from the
literature and the result from it is used to compare with predicted values of each RSM design. DOD
had the lowest error at value of 2.93% and both FCC and HDD models were 4.43%.