Adsorption-reduction of Cr(Ⅵ) onto unmodified and phytic acid-modified carob waste: Kinetic and isotherm modeling

Bouaouina Kenza; Barras Alexandre; Bezzi NacerAmin Mohammed A.Szunerits SabineBoukherroub Rabah

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Adsorption-reduction of Cr(Ⅵ) onto unmodified and phytic acid-modified carob waste: Kinetic and isotherm modeling

机译：Adsorption-reduction of Cr(Ⅵ) onto unmodified and phytic acid-modified carob waste: Kinetic and isotherm modeling

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Carob waste (CW) is an agro-biomass material abundant in nature with potential use for eco-friendly remediation. However, like many biomass-based adsorbents, it suffers from its low adsorption capacity for organic/inorganic pollutants. Therefore, modification using physical and/or chemical means is commonly applied to improve the adsorptive properties of biomass-based adsorbents. In this study, carob waste (CW) and carob waste functionalized with phytic acid (PA-CW), as an ecofriendly product, were applied for the first time for Cr(VI) elimination. Various methods were applied for the material characterization like Fourier-transform infrared spectroscopy, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA and DTG), X-ray photoelectron spectroscopy (XPS), specific surface area and porosity measurements. The results proved that both CW and PA-CW own appropriate features for efficient adsorption. Bach experiments revealed that the optimum parameters for Cr(VI) (100 mg/mL) removal at 25 degrees C were pH 2, 0.05 and 0.025 g as adsorbent dose for CW and PA-CW, respectively, over 120 min contact time. The kinetic of adsorption was well-described by the pseudo-second order model, whereas the isotherm modeling fitted well the modified Langmuir model. CW and PA-CW achieved respectively maximum adsorption capacities of 212.4 and 387.9 mg/g, which are among the highest values so far reported for biomass-based adsorbent materials. These results confirmed that CW and PA-CW could be alternative cost-effective adsorbents even for high concentrations of Cr(VI) in industrial wastewaters along with their reduction capacity.

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《Chemosphere》 |2022年第6期|134188.1-134188.10|共10页
作者
Bouaouina Kenza; Barras Alexandre; Bezzi NacerAmin Mohammed A.Szunerits SabineBoukherroub Rabah;
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作者单位

Univ Bejaia, Lab Technol Mat & Genie Proc LTMGP, Bejaia 06000, Algeria|Univ Polytech Hauts De France, Univ Lille, Cent Lille, CNRS,UMR 8520,IEMN, F-59000 Lille, France;

Univ Polytech Hauts De France, Univ Lille, Cent Lille, CNRS,UMR 8520,IEMN, F-59000 Lille, France;

Univ Bejaia, Lab Technol Mat & Genie Proc LTMGP, Bejaia 06000, AlgeriaTaif Univ, Coll Sci, Dept Chem, POB 11099, Taif 21944, Saudi Arabia;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
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关键词
Carob waste; Phytic acid; Cr(VI) adsorption; Kinetic-isotherm; Thermodynamic modeling;

Adsorption-reduction of Cr(Ⅵ) onto unmodified and phytic acid-modified carob waste: Kinetic and isotherm modeling

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