Removal of reactive blue 19 from aqueous solution by pomegranate residual-based activated carbon: optimization by response surface methodology

Journal of Environmental Health Science Engineering

Mokhtar Arami¹  Mohammad Reza Alavi Moghaddam²  Elham Radaei² 

[1] Department of Textile Engineering, Amirkabir University of Technology (AUT), Tehran, Iran;Department of Civil and Environmental Engineering, Amirkabir University of Technology (AUT), Tehran, Iran

关键词: Response surface methodology;    Pomegranate residual;    Adsorption;    Reactive dye;   

Others  :  805107
DOI  :  10.1186/2052-336X-12-65

 received in 2012-12-27, accepted in 2014-03-05,  发布年份 2014

【 摘 要 】

Background

In this research, response surface methodology (RSM) was applied to optimize Reactive Blue 19 removal by activated carbon from pomegranate residual. A 2⁴ full factorial central composite design (CCD) was applied to evaluate the effects of initial pH, adsorbent dose, initial dye concentration, and contact time on the dye removal efficiency.

Methodology

The activated carbon prepared by 50 wt.% phosphoric acid activation under air condition at 500°C. The range of pH and initial dye concentration were selected in a way that considered a wide range of those variables. Furthermore, the range of contact time and adsorbent dose were determined based on initial tests. Levels of selected variables and 31 experiments were determined. MiniTab (version 16.1) was used for the regression and graphical analyses of the data obtained.

Results

It was found that the decrease of initial dye concentration and the increase of initial pH, adsorbent dose, and contact time are beneficial for improving the dye removal efficiency. Analysis of variance (ANOVA) results presented high R² value of 99.17% for Reactive Blue 19 dye removal, which indicates the accuracy of the polynomial model is acceptable.

Conclusions

Initial pH of 11, adsorbent dose of 1.025 g/L, initial dye concentration of 100 mg/L, and contact time of 6.8 minutes found to be the optimum conditions. Dye removal efficiency of 98.7% was observed experimentally at optimum point which confirmed close to model predicted (98.1%) result.

【 授权许可】

   
2014 Radaei et al.; licensee BioMed Central Ltd.

【 图 表 】

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