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  • Methylene blue adsorption onto swede rape straw (Brassica napus L.) modified by tartaric acid: equilibrium, kinetic and adsorption mechanisms.

Methylene blue adsorption onto swede rape straw (Brassica napus L.) modified by tartaric acid: equilibrium, kinetic and adsorption mechanisms.

Bioresource technology (2012-10-03)
Yanfang Feng, Hui Zhou, Guohua Liu, Jun Qiao, Jinhua Wang, Haiying Lu, Linzhang Yang, Yonghong Wu
ABSTRACT

The aim of this study was to develop a promising and competitive bioadsorbent with the abundant of source, low price and environmentally friendly characters to remove cationic dye from wastewater. The swede rape straw (Brassica napus L.) modified by tartaric acid (SRSTA) was prepared, characterized and used to remove methylene blue (MB) from aqueous solution at varied operational conditions (including MB initial concentrations, adsorbent dose, etc.). Results demonstrated that the equilibrium data was well fitted by Langmuir isotherm model. The maximum MB adsorption capacity of SRSTA was 246.4 mg g(-1), which was comparable to the results of some previous studied activated carbons. The higher dye adsorption capacity could be attributed to the presence of more functional groups such as carboxyl group on the surface of SRSTA. The adsorption mechanism was also discussed. The results indicate that SRSTA is a promising and valuable absorbent to remove methylene blue from wastewater.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
DL-Tartaric acid, ReagentPlus®, 99%
Sigma-Aldrich
DL-Tartaric acid, ≥99%
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L-(+)-Tartaric acid, ACS reagent, ≥99.5%
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L-(+)-Tartaric acid, puriss. p.a., reag. ISO, 99.5-101.0% (calc. to the dried substance)
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L-(+)-Tartaric acid, puriss., meets analytical specification of Ph. Eur., NF, 99.7-100.5% (calc. to the dried substance), powder
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D-(−)-Tartaric acid, puriss., unnatural form, ≥99.0% (T)
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D-(−)-Tartaric acid, ReagentPlus®, 99%
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L-(+)-Tartaric acid, ≥99.5%
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L-(+)-Tartaric acid, ≥99.7%, FCC, FG
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L-(+)-Tartaric acid, BioXtra
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L-(+)-Tartaric acid, JIS special grade, ≥99.5%
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L-(+)-Tartaric acid, SAJ first grade, ≥99.5%
Supelco
L-(+)-Tartaric acid, certified reference material, TraceCERT®, Manufactured by: Sigma-Aldrich Production GmbH, Switzerland
Sigma-Aldrich
L-(+)-Tartaric acid, anhydrous, free-flowing, Redi-Dri, ACS reagent, ≥99.5%