Characterisation of bio-silica synthesised from cogon grass (Imperata cylindrica)

Kien Woh Kow; Rozita Yusoff; A. R.Abdul Aziz; E. C. Abdullah

doi:10.1016/j.powtec.2014.01.018

Characterisation of bio-silica synthesised from cogon grass (Imperata cylindrica)

Kien Woh Kow, Rozita Yusoff, A. R.Abdul Aziz, E. C. Abdullah

Research output: Journal Publication › Article › peer-review

21 Citations (Scopus)

Abstract

Amorphous silica has many applications due to the material's high surface area and pozzolanic properties. In this work, amorphous silica was synthesised from cogon grass (Imperata cylindrica) by combustion at 650°C. Kinetic parameters of the combustion were determined by fitting thermogravimetric analysis (TGA) data to the Flynn-Wall-Ozawa model, where the corresponding activation energy and frequency factor are 202.5±5.1kJmol^-1 and (7.9±6.7)×10¹⁵s^-1. Energy-dispersive X-ray (EDX) analysis revealed that cogon grass has a relatively low silica content (2.9wt.%). In addition, X-ray diffraction (XRD) data showed that the purity and amorphicity of silica obtained are significantly affected by the potassium content in the weed. However, the process of acid leaching removed the impurities and increased the purity of silica from 31.4wt.% to 83.4wt.%. The primary particle size (a) and the mass fractal dimension (D) of silica particles determined by small-angle X-ray scattering (SAXS) were 19.8nm and 2.4, respectively.

Original language	English
Pages (from-to)	206-213
Number of pages	8
Journal	Powder Technology
Volume	254
DOIs	https://doi.org/10.1016/j.powtec.2014.01.018
Publication status	Published - Mar 2014
Externally published	Yes

Keywords

Adsorption
Bio-silica
Cogon grass
Silica aerogel
Zeolite

ASJC Scopus subject areas

General Chemical Engineering

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10.1016/j.powtec.2014.01.018

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title = "Characterisation of bio-silica synthesised from cogon grass (Imperata cylindrica)",

abstract = "Amorphous silica has many applications due to the material's high surface area and pozzolanic properties. In this work, amorphous silica was synthesised from cogon grass (Imperata cylindrica) by combustion at 650°C. Kinetic parameters of the combustion were determined by fitting thermogravimetric analysis (TGA) data to the Flynn-Wall-Ozawa model, where the corresponding activation energy and frequency factor are 202.5±5.1kJmol-1 and (7.9±6.7)×1015s-1. Energy-dispersive X-ray (EDX) analysis revealed that cogon grass has a relatively low silica content (2.9wt.%). In addition, X-ray diffraction (XRD) data showed that the purity and amorphicity of silica obtained are significantly affected by the potassium content in the weed. However, the process of acid leaching removed the impurities and increased the purity of silica from 31.4wt.% to 83.4wt.%. The primary particle size (a) and the mass fractal dimension (D) of silica particles determined by small-angle X-ray scattering (SAXS) were 19.8nm and 2.4, respectively.",

keywords = "Adsorption, Bio-silica, Cogon grass, Silica aerogel, Zeolite",

author = "Kow, {Kien Woh} and Rozita Yusoff and Aziz, {A. R.Abdul} and Abdullah, {E. C.}",

note = "Funding Information: This work is supported by the Faculty of Engineering, University of Malaya . MOSTI (Ministry of Science, Technology and Innovation, Malaysia) is acknowledged for funding the project under FRGS (Fundamental Research Grant Scheme, project no.: FP066/2010B ). This work is also financially supported by the University of Malaya under UMRG grant (University of Malaya Research Grant, grant no. RP002A-13AET ).",

year = "2014",

month = mar,

doi = "10.1016/j.powtec.2014.01.018",

language = "English",

volume = "254",

pages = "206--213",

journal = "Powder Technology",

issn = "0032-5910",

publisher = "Elsevier",

}

TY - JOUR

T1 - Characterisation of bio-silica synthesised from cogon grass (Imperata cylindrica)

AU - Kow, Kien Woh

AU - Yusoff, Rozita

AU - Aziz, A. R.Abdul

AU - Abdullah, E. C.

N1 - Funding Information: This work is supported by the Faculty of Engineering, University of Malaya . MOSTI (Ministry of Science, Technology and Innovation, Malaysia) is acknowledged for funding the project under FRGS (Fundamental Research Grant Scheme, project no.: FP066/2010B ). This work is also financially supported by the University of Malaya under UMRG grant (University of Malaya Research Grant, grant no. RP002A-13AET ).

PY - 2014/3

Y1 - 2014/3

N2 - Amorphous silica has many applications due to the material's high surface area and pozzolanic properties. In this work, amorphous silica was synthesised from cogon grass (Imperata cylindrica) by combustion at 650°C. Kinetic parameters of the combustion were determined by fitting thermogravimetric analysis (TGA) data to the Flynn-Wall-Ozawa model, where the corresponding activation energy and frequency factor are 202.5±5.1kJmol-1 and (7.9±6.7)×1015s-1. Energy-dispersive X-ray (EDX) analysis revealed that cogon grass has a relatively low silica content (2.9wt.%). In addition, X-ray diffraction (XRD) data showed that the purity and amorphicity of silica obtained are significantly affected by the potassium content in the weed. However, the process of acid leaching removed the impurities and increased the purity of silica from 31.4wt.% to 83.4wt.%. The primary particle size (a) and the mass fractal dimension (D) of silica particles determined by small-angle X-ray scattering (SAXS) were 19.8nm and 2.4, respectively.

AB - Amorphous silica has many applications due to the material's high surface area and pozzolanic properties. In this work, amorphous silica was synthesised from cogon grass (Imperata cylindrica) by combustion at 650°C. Kinetic parameters of the combustion were determined by fitting thermogravimetric analysis (TGA) data to the Flynn-Wall-Ozawa model, where the corresponding activation energy and frequency factor are 202.5±5.1kJmol-1 and (7.9±6.7)×1015s-1. Energy-dispersive X-ray (EDX) analysis revealed that cogon grass has a relatively low silica content (2.9wt.%). In addition, X-ray diffraction (XRD) data showed that the purity and amorphicity of silica obtained are significantly affected by the potassium content in the weed. However, the process of acid leaching removed the impurities and increased the purity of silica from 31.4wt.% to 83.4wt.%. The primary particle size (a) and the mass fractal dimension (D) of silica particles determined by small-angle X-ray scattering (SAXS) were 19.8nm and 2.4, respectively.

KW - Adsorption

KW - Bio-silica

KW - Cogon grass

KW - Silica aerogel

KW - Zeolite

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DO - 10.1016/j.powtec.2014.01.018

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SN - 0032-5910

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EP - 213

JO - Powder Technology

JF - Powder Technology

ER -

Characterisation of bio-silica synthesised from cogon grass (Imperata cylindrica)

Abstract

Keywords

ASJC Scopus subject areas

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