Surface texture, chemistry and adsorption properties of acid blue 9 of hemp (Cannabis sativa L.) bast-based activated carbon fibers prepared by phosphoric acid activation

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy Pub Date : 2011-01-01 DOI:10.1016/j.biombioe.2010.08.061

Ru Yang , Guoqiang Liu , Xinhua Xu , Min Li , Jianchun Zhang , Xinmin Hao

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引用次数: 106

Abstract

Hemp (Cannabis sativa L.) bast was used to prepare activated carbon fibers by phosphoric acid activation at 400–600 °C. The pyrolysis process, textural and chemical properties for the samples were investigated by means of TG/DTA, SEM, cryogenic N₂ adsorption, FTIR and XPS. Dye adsorption on the resultant sample was also measured. The textural properties of the activated carbon fibers were found to be strongly dependent on the activation temperature. Activated carbon fibers exhibited narrow pore size distributions with maxima in the micropore and small mesopore regions. BET surface area, total pore volume, micropore volume and mesopore volume increased with the increase of activation temperature up to 450 °C and then decreased with further heating, and a sample with maximum surface area of 1142 m² g⁻¹ and total pore volume of 0.67 cm³ g⁻¹ was obtained. Phosphoric acid facilitated the conservation of porous structure, led to the creation of tremendous porosity, and resulted in various P-containing functional structures on the surface and in the bulk phase of the resultant samples. The adsorption of acid blue 9 on the sample could be favorably described by Langmuir isotherm, and the adsorption kinetics was found to be well fitted by the intraparticle diffusion model.

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磷酸活化法制备大麻碱基活性炭纤维的表面结构、化学性质及对酸性蓝9的吸附性能

以大麻(Cannabis sativa L.)韧皮为原料，在400-600℃下经磷酸活化制备活性炭纤维。采用热重分析(TG/DTA)、扫描电镜(SEM)、低温氮气吸附、红外光谱(FTIR)和XPS等手段对样品的热解过程、结构和化学性质进行了研究。还测量了所得样品对染料的吸附。活性炭纤维的织构性能与活化温度密切相关。活性炭纤维的孔径分布较窄，微孔区孔径最大，中孔区孔径较小。当活化温度升高至450℃时，试样的比表面积、总孔体积、微孔体积和中孔体积均随活化温度的升高而增大，然后随着进一步加热而减小，得到的试样最大比表面积为1142 m2 g−1，总孔体积为0.67 cm3 g−1。磷酸促进了多孔结构的保存，产生了巨大的孔隙度，并在所得样品的表面和体相中形成了各种含磷的功能结构。Langmuir等温线可以很好地描述酸蓝9在样品上的吸附，吸附动力学可以很好地拟合颗粒内扩散模型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biomass & Bioenergy 工程技术-能源与燃料

CiteScore

11.50

自引率

3.30%

发文量

258

审稿时长

60 days

期刊介绍： Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials. The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy. Key areas covered by the journal: • Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation. • Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal. • Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes • Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation • Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.