Adsorption property of direct fast black onto acid-thermal modified sepiolite and optimization of adsorption conditions using Box-Behnken response surface methodology

doi:10.1007/s11783-012-0477-9

Front Envir Sci Eng

2013, Vol. 7

Issue (4) : 503-511 https://doi.org/10.1007/s11783-012-0477-9

RESEARCH ARTICLE

Adsorption property of direct fast black onto acid-thermal modified sepiolite and optimization of adsorption conditions using Box-Behnken response surface methodology

Chengyuan SU^1,2, Weiguang LI^1,3(

), Yong WANG¹

1. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; 2. School of Environment and Resources, Guangxi Normal University, Guilin 541004, China; 3. National Engineering Research Center of Urban Water Resources, Harbin 150090, China

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Abstract

The adsorption of direct fast black onto acid-thermal modified sepiolite was investigated. Batch adsorption experiments were performed to evaluate the influences of experimental parameters such as initial dye concentration, initial solution pH and adsorbent dosage on the adsorption process. The three-factor and three-level Box-Behnken response surface methodology (RSM) was utilized for modeling and optimization of the adsorption conditions for direct fast black onto the acid-thermal modified sepiolite. The raw sepiolite was converted to acid-thermal modified sepiolite, and changes in the fourier transform infrared spectrum (FTIR) adsorption bands of the sample were noted at 3435 cm^-1 and 1427 cm^-1. The zeolitic water disappeared and the purity of sepiolite was improved by acid-thermal modification. The decolorization rate of direct fast black adsorbed increased from 68.2% to 98.9% on acid-thermal modified sepiolite as the initial solution pH decreased from 10 to 2. When the adsorbent dosage reached to 2.5 g·L^-1, 2.0 g·L^-1, 1.5 g·L^-1 and 1.0 g·L^-1, the decolorization rate was 90.3%, 86.7%, 61.0% and 29.8%, respectively. When initial dye concentration increased from 25 to 200 mg·L^-1, the decolorization rate decreased from 91.9% to 60.0%. The RSM results showed that the interaction between adsorbent dosage and pH to be a significant factor. The optimum conditions were as follows: the adsorbent dosage 1.99 g·L^-1, pH 4.22, and reaction time 5.2 h. Under these conditions, the decolorization rate was 95.1%. The three dimensional fluorescence spectra of direct fast black before and after treatment showed that the direct fast black was almost all adsorbed by the acid-thermal modified sepiolite.

Keywords direct fast black acid-thermal modified sepiolite adsorption response surface methodology

Corresponding Author(s): LI Weiguang,Email:hitlwg@126.com

Issue Date: 01 August 2013

Cite this article:

Chengyuan SU,Weiguang LI,Yong WANG. Adsorption property of direct fast black onto acid-thermal modified sepiolite and optimization of adsorption conditions using Box-Behnken response surface methodology[J]. Front Envir Sci Eng, 2013, 7(4): 503-511.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0477-9
https://academic.hep.com.cn/fese/EN/Y2013/V7/I4/503

Tab.1 Experimental range and levels of independent variables

Fig.1 FTIR spectrum of the raw sepiolite

Fig.2 FTIR spectrum of the acid-thermal modified sepiolite

Fig.3 FTIR spectrum of the acid-thermal modified sepiolite-dye composite

Fig.4 Effects of initial dye concentration on the adsorption onto acid-thermal modified sepiolite

Fig.5 Effects of initial pH on the adsorption onto acid-thermal modified sepiolite

Fig.6 Effects of adsorbent dosage on the adsorption onto acid-thermal modified sepiolite

Tab.2 Response surface design arrangement and experimental results

Tab.3 Estimated value of coefficient regression for the fitted quadratic polynomial model of direct fast black

Tab.4 Analysis of variance of regression model for direct fast black decolorization

Fig.7 Internally studentized residuals and normal % probability plot for direct fast black decolorization

Fig.8 Response surface plot and contourline showing the effect of the dosage of sepiolite and pH

Fig.9 Response surface plot and contourline showing the effect of the dosage of sepiolite and reaction time

Fig.10 Response surface plot and contourline showing the effect of the pH and reaction time

Fig.11 Three dimensional fluorescence spectra of direct fast black in (a) before and (b) after treatment

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