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Removal of cationic dyes: basic magenta and methylene blue from aqueous solution by adsorption on modified loofah

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Abstract

Modified loofah was prepared by a simple chemical graft method to improve its adsorption for cationic dyes. Experimental results showed that the maximum amounts of basic magenta and methylene blue loaded on the modified loofah were 83.5 and 85.5 mg g−1, and that on the unmodified loofah were 22.2 and 33.7 mg g−1, respectively. The adsorption for both dyes could reach equilibrium after 300 min. A pseudo-second-order model is suitable for describing the adsorption and desorption kinetics of both dyes on the modified sorbent. According to the intra-particle diffusion model, sorption and desorption processes for the two dyes both presented two distinct phases and were mainly controlled by intra-particle diffusion. The dye-loaded modified loofah could be regenerated by using the mixture solution of HCl and ethanol (VHCl:Vethanol = 3:2) as eluent. Adsorption in the binary system showed that adsorption of the dyes was depressed by the presence of the other dye, and the two dyes could be removed efficiently when the initial concentrations were lower than 5.0 × 10−5 mol L−1. The Langmuir competitive model was suitable to predict the sorption isotherm in the binary system.

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Acknowledgments

The work is financially supported by National Natural Science Foundation of China (No. 20906072), the Program for New Century Excellent Talents in University (No. NCET-11-0966), the Outstanding Youth Scientific Foundation of Hubei Province (No. 2011CDA101), and Wuhan Chenguang Scheme established under Wuhan Science and Technology Bureau (no. 201150431098).

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Authors and Affiliations

  1. Hubei Novel Reactor & Green Chemical Technology Key Laboratory, Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan, 430074, China

    Jun-xia Yu, Li-yan Wang, Ru-an Chi, Yue-fei Zhang, Zhi-gao Xu & Jia Guo

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  1. Jun-xia Yu
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  2. Li-yan Wang
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Correspondence to Ru-an Chi.

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Yu, Jx., Wang, Ly., Chi, Ra. et al. Removal of cationic dyes: basic magenta and methylene blue from aqueous solution by adsorption on modified loofah. Res Chem Intermed 39, 3775–3790 (2013). https://doi.org/10.1007/s11164-012-0880-7

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