2-Steps KOH activation of rice straw: An efficient method for preparing high-performance activated carbons

Basta, Altaf H.; Fierro, Vanessa; El‐Saied, Houssni

doi:10.1016/j.biortech.2009.02.028

Cited by 275 publications

(144 citation statements)

References 26 publications

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“…Besides, N 2 uptake drastically increased with a decrease in pH from 5.7 to 3.2, indicating the development of porosity. Additionally, the knee of adsorption isotherm for porous silica prepared at lower pH was more rounded and open, indicative of the development of mesoporosity (Basta et al, 2009). Hence, the pH significantly affected the textural properties of the porous silica.…”

Section: Methodsmentioning

confidence: 98%

Reduction in time required for synthesis of high specific surface area silica from pyrolyzed rice husk by precipitation at low pH

Chen

Zhu

2011

Bioresource Technology

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Section: Methodsmentioning

confidence: 98%

Reduction in time required for synthesis of high specific surface area silica from pyrolyzed rice husk by precipitation at low pH

Chen

Zhu

2011

Bioresource Technology

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“…As early as 1991, Kim and Lee (1991) adopted chemical activation with ZnCl 2 as activating agent to produce powdered activated carbons from rice straw for the purification of water. Recently, Basta et al (2009) applied a two-step process of carbonization followed by KOH activation to prepare activated carbons from rice straw. High-performance activated carbons with surface areas as high as 1917 m 2 /g were produced.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of activated carbon produced from rice straw by (NH4)2HPO4 activation

Gao

Liu

Xue

et al. 2011

Bioresource Technology

107

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“…Their application to lignocellulosic biomass is widely used, but it is not as effective because of poor yields and low porosity development, arising from the excessive degradation of the organic substrate [21][22][23]. In this regard the HTC treated biomass is characterised by a more "coal-like" chemical structure, as a consequence it may represent a more suitable precursor for the production of highly porous activated carbons (ACs).…”

Section: Introductionmentioning

confidence: 99%

Tailoring the porosity of chemically activated hydrothermal carbons: Influence of the precursor and hydrothermal carbonization temperature

Falco

Marco-Lozar

Salinas-Torres

et al. 2013

Carbon

217

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Advanced porous materials with tailored porosity (extremely high development of microporosity together with a narrow micropore size distribution (MPSD)) are required in energy and environmental related applications. Lignocellulosic biomass derived HTC carbons are good precursors for the synthesis of activated carbons (ACs) via KOH chemical activation. However, more research is needed in order to tailor the microporosity for those specific applications. In the present work, the influence of the precursor and HTC temperature on the porous properties of the resulting ACs is analyzed, remarking that, regardless of the precursor, highly microporous ACs could be generated. The HTC temperature was found to be an extremely influential parameter affecting the porosity development and the MPSD of the ACs. Tuning of the MPSD of the ACs was achived by modification of the HTC temperature. Promising preliminary results in gas storage (i.e. CO 2 capture and high pressure CH 4 storage) were obtained with these materials, showing the effectiveness of this synthesis strategy in converting a low value lignocellulosic biomass into a functional carbon material with high performance in gas storage applications. IntroductionHydrothermal Carbonization (HTC) is now a well-established thermochemical synthesis alternative to produce functional carbon materials with a tunable chemical structure from pure carbohydrates or lignocellulosic biomass [1][2][3].During HTC, biomass-derived precursors are converted into valuable carbon materials using water as reaction medium at mild temperatures (< 200°C) under self-generated pressures [4]. Even though this methodology has been known for almost 100 years [5], its full potential, as a synthetic route for carbon materials having important applications in several fields such as catalysis, energy storage, CO 2 sequestration, water purification, soil remediation, has been revealed only recently, mainly via the work of Dr. Titirici and coworkers [6].Under hydrothermal conditions monosaccharides are dehydrated to 5-hydroxymethylfurfural (5-HMF) via the well-known Lobry de Bruyn-Alberta van Ekstein rearrangement [7]. Once 5-HMF is formed, it is in situ "polymerised" yielding the HTC carbon product [8]. While most of the research efforts focus on the exploitation of HMF for the production of chemicals, bioplastics and biofuels [9], the Titirici´s group rediscovered these processes for the production of green and valuable carbon and carbon-hybrid materials [1,4].One of the main limiting factors, hindering the effective and straightforward exploitation of HTC carbons for several end-applications (eg. catalysis, separation science, energy production and storage), is their low surface area and porosity [10]. In the case of monosaccharide derived HTC carbons, this problem has been elegantly overcome by using hard\soft-templating strategies or by addition of structural directing agents [11][12][13]. Such synthetic routes are effective because of the homogeneous nature of the pre-HTC aqueous reaction mixt...

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2-Steps KOH activation of rice straw: An efficient method for preparing high-performance activated carbons

Cited by 275 publications

References 26 publications

Reduction in time required for synthesis of high specific surface area silica from pyrolyzed rice husk by precipitation at low pH

Reduction in time required for synthesis of high specific surface area silica from pyrolyzed rice husk by precipitation at low pH

Preparation and characterization of activated carbon produced from rice straw by (NH4)2HPO4 activation

Tailoring the porosity of chemically activated hydrothermal carbons: Influence of the precursor and hydrothermal carbonization temperature

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