Study on organic acid leaching method to eliminate impurities in rice husk

The aim of this thesis is to investigate the effect of citric acid leaching method to eliminate impurities in rice husk (RH) in order to obtain high purity silica (SiO₂) for the production of rice husk glass (RH-glass). The process parameters involved are citric acid solution concentration, leaching...

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Format:	Thesis
Language:	English
Subjects:	Rice hulls Citric acid Leaching
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76662/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76662/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76662/3/Declaration%20Form.pdf
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spelling	my-unimap-766622022-11-01T02:01:04Z Study on organic acid leaching method to eliminate impurities in rice husk Noorina Hidayu, Jamil The aim of this thesis is to investigate the effect of citric acid leaching method to eliminate impurities in rice husk (RH) in order to obtain high purity silica (SiO₂) for the production of rice husk glass (RH-glass). The process parameters involved are citric acid solution concentration, leaching time, and stirring time. The production of RH-glass from high purity SiO₂ was prepared by introducing acid leaching treatment by using citric acid (C₆H₈O₇) followed by combustion. The purity of silica in rice husk were analyzed by using X-ray Fluorescence (XRF) analysis and proven to be high purity by percentage of ˃99 wt% SiO₂. With increasing of citric acid solution concentration, leaching time, and stirring time, the percentage of SiO₂ was increased to >99 wt%. High purity of SiO₂ was achieved even when the RH was leached at minimal parameter of 0.1 M citric acid solution, temperature of 40 ºC for 1 h. The elimination of iron (Fe) element impurities was analyzed by using Inductively Coupled Plasma Mass Spectrometry (ICP). It was found that content of Fe elements discharged into the citric acid solution during the acid leaching process gradually increases with increasing molarity of citric acid solution. Phase of silica in rice husk ash (RHA) was obtained after heated at 1000 ºC for 5 hours. X-ray Diffraction (XRD) shows that the silica exist in amorphous phase and was detected at 2θ=22º. However, the phase structure of the RH-glass was observed to be crystalline due to the high melting temperature of silica. The color of rice husk ashes completely changed from black to white ashes. The microstructure of silica as observed using Scanning Electron Microscope (SEM) and the micrograph shows the homogenous phases and irregular shape of particles. A clear RHglass was produced by heating the high purity SiO₂ at 1560 ºC for 12h. Universiti Malaysia Perlis (UniMAP) Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/76662 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76662/4/license.txt 8a4605be74aa9ea9d79846c1fba20a33 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76662/1/Page%201-24.pdf 6d031069ffcddd1f29386de0ef2649b1 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76662/2/Full%20text.pdf b5dc261f9c8c89eb66cc1b11ee16ada3 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76662/3/Declaration%20Form.pdf 438cb228c0eabd69dc325e253cc4720f Universiti Malaysia Perlis (UniMAP) Rice hulls Citric acid Leaching School of Materials Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
advisor	Noorina Hidayu, Jamil
topic	Rice hulls Citric acid Leaching
spellingShingle	Rice hulls Citric acid Leaching Study on organic acid leaching method to eliminate impurities in rice husk
description	The aim of this thesis is to investigate the effect of citric acid leaching method to eliminate impurities in rice husk (RH) in order to obtain high purity silica (SiO₂) for the production of rice husk glass (RH-glass). The process parameters involved are citric acid solution concentration, leaching time, and stirring time. The production of RH-glass from high purity SiO₂ was prepared by introducing acid leaching treatment by using citric acid (C₆H₈O₇) followed by combustion. The purity of silica in rice husk were analyzed by using X-ray Fluorescence (XRF) analysis and proven to be high purity by percentage of ˃99 wt% SiO₂. With increasing of citric acid solution concentration, leaching time, and stirring time, the percentage of SiO₂ was increased to >99 wt%. High purity of SiO₂ was achieved even when the RH was leached at minimal parameter of 0.1 M citric acid solution, temperature of 40 ºC for 1 h. The elimination of iron (Fe) element impurities was analyzed by using Inductively Coupled Plasma Mass Spectrometry (ICP). It was found that content of Fe elements discharged into the citric acid solution during the acid leaching process gradually increases with increasing molarity of citric acid solution. Phase of silica in rice husk ash (RHA) was obtained after heated at 1000 ºC for 5 hours. X-ray Diffraction (XRD) shows that the silica exist in amorphous phase and was detected at 2θ=22º. However, the phase structure of the RH-glass was observed to be crystalline due to the high melting temperature of silica. The color of rice husk ashes completely changed from black to white ashes. The microstructure of silica as observed using Scanning Electron Microscope (SEM) and the micrograph shows the homogenous phases and irregular shape of particles. A clear RHglass was produced by heating the high purity SiO₂ at 1560 ºC for 12h.
format	Thesis
title	Study on organic acid leaching method to eliminate impurities in rice husk
title_short	Study on organic acid leaching method to eliminate impurities in rice husk
title_full	Study on organic acid leaching method to eliminate impurities in rice husk
title_fullStr	Study on organic acid leaching method to eliminate impurities in rice husk
title_full_unstemmed	Study on organic acid leaching method to eliminate impurities in rice husk
title_sort	study on organic acid leaching method to eliminate impurities in rice husk
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Materials Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76662/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76662/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76662/3/Declaration%20Form.pdf
_version_	1776104271308128256

Study on organic acid leaching method to eliminate impurities in rice husk

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