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Clean Technologies and Environmental Policy

Quaternary ammonium-functionalized rice straw hydrochar as efficient adsorbents for methyl orange removal from aqueous solution

  • 02-05-2019
  • Original Paper
Published in:
Authors
Xiong Peng
Zongcheng Yan
Xi Cheng
Yu Li
Aili Wang
Li Chen
Published in
Clean Technologies and Environmental Policy | Issue 6/2019

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Abstract

In this study, a series of quaternary ammonium-modified hydrochars was fabricated using rice straw as raw material. The physicochemical properties of the hydrochars before and after modification were characterized by FTIR, XPS and CHN element analysis, and an adsorption mechanism was proposed. Results showed the quaternary ammonium groups were successfully grafted onto the hydrochar. The modified hydrochar showed favorable capacity for methyl orange (MO) elimination from aqueous solution with a maximum value of 849 mg/g, which was an order of magnitude higher than that of pristine hydrochar (49 mg/g). Besides, the MO adsorption of all the adsorbents fitted well with the pseudo-second-order and Langmuir models, and the adsorption process was exothermal. Analysis of the adsorption mechanism showed that the decontamination process was primarily controlled by electrostatic attractions and ion exchange.

Graphical abstract

Utilization of rice straw to produce quaternary ammonium-functionalized hydrochars for the efficient removal of methyl orange.
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Title
Quaternary ammonium-functionalized rice straw hydrochar as efficient adsorbents for methyl orange removal from aqueous solution
Authors
Xiong Peng
Zongcheng Yan
Xi Cheng
Yu Li
Aili Wang
Li Chen
Publication date
02-05-2019
Publisher
Springer Berlin Heidelberg
Published in
Clean Technologies and Environmental Policy / Issue 6/2019
Print ISSN: 1618-954X
Electronic ISSN: 1618-9558
DOI
https://doi.org/10.1007/s10098-019-01703-2
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