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Oxidative modifications of rice hull-based carbons for dibenzothiophene adsorptive removal

Paper ID Volume ID Publish Year Pages File Format Full-Text
54802 47027 2013 7 PDF Available
Title
Oxidative modifications of rice hull-based carbons for dibenzothiophene adsorptive removal
Abstract

Four oxidative modifications using concentrated nitric acid, concentrated sulfuric acid, peracetic acid, and hot air, were employed to treat the rice hull (RH) activated by KOH at 750 °C, which produced four RH-based carbon materials with different surface chemical properties. The textural structures, surface chemical properties and surface topography were respectively characterized by N2 adsorption, Boehm titration, Fourier transmission infrared (FT-IR) and scanning electron microscopy (SEM) techniques. Oxidative modifications resulted in changes of both the textural structures and the surface chemistry properties. Experimental results showed that the DBT adsorption behavior of RH-based carbon adsorbents fitted well the Langmuir isotherm equation. The DBT adsorption capacity was strongly influenced by the oxygen containing acid groups on the samples, and an excellent correlation between DBT adsorption capacity and the amount of the strong acid groups was observed, indicating that the amount of the strong acidic groups on RH-based carbons play the most important role in DBT adsorption. It was postulated that the formation of donor–acceptor complexes between the adsorbent and the adsorbate was largely responsible for the significant improvement of the DBT adsorption after oxidative modifications.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (161 K)Download as PowerPoint slideHighlights► Rice hull (RH) can be used to prepare RH-based carbon adsorbents with high adsorption performance for fuel desulfurization. ► Four oxidative modifications of the sample enhanced DBT adsorption capacity, especially nitric acid oxidation. ► DBT adsorption behaviors on RH-based carbon fit the Langmuir isotherm. ► Textural structures of RH-based carbon are not controlling factors in DBT adsorption. ► The amount of the strong acidic groups on RH-based carbons may play the most important role in DBT adsorption.

Keywords
Rice hull; KOH-activation; Adsorptive desulfurization; Oxidative modification; Carbon surface chemistry
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Oxidative modifications of rice hull-based carbons for dibenzothiophene adsorptive removal
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 212, 1 September 2013, Pages 31–37
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us