Activated Rice Husk-Based Adsorbents For Chlorophenol Removal And Their Bioregeneration
The objectives of this study are to develop rice husk-based adsorbents activated with different activating agents, namely potassium hydroxide (KRH), nitric acid and methanol (ARH), and ethylenediamine (MRH), and compare their adsorption capacities and bioregeneration efficiencies to remove 4-c...
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2013
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my-usm-ep.435342019-04-12T05:26:16Z Activated Rice Husk-Based Adsorbents For Chlorophenol Removal And Their Bioregeneration 2013-05 Khor, Siok Moi QD1-999 Chemistry The objectives of this study are to develop rice husk-based adsorbents activated with different activating agents, namely potassium hydroxide (KRH), nitric acid and methanol (ARH), and ethylenediamine (MRH), and compare their adsorption capacities and bioregeneration efficiencies to remove 4-chlorophenol (4- CP) and 2,4-dichlorophenol (2,4-DCP) from the aqueous solutions with the commercially available powdered activated carbon (PAC). From the adsorption equilibrium studies of 4-CP and 2,4-DCP, the trend of maximum adsorption capacity, qm, among the adsorbents followed KRH > PAC > ARH > MRH and in agreement with the trend of BET surface areas. The equilibrium adsorption data of KRH and PAC were best described by the Langmuir model (R2 > 0.98) while the Freundlich model was suitable to describe the equilibrium adsorption data for MRH and ARH (R2 > 0.99). These observations were confirmed by the values of heterogeneity constant, μ, obtained from the Redlich-Peterson model. It could be concluded that the adsorbent surfaces of MRH and ARH were heterogeneous, while those of the KRH and PAC were homogenous. For the temperature-dependent Temkin and Dubinin-Radushkevich isotherm models, the Dubinin-Radushkevich model was better fitted to the experimental data than the Temkin model. 2013-05 Thesis http://eprints.usm.my/43534/ http://eprints.usm.my/43534/1/Khor%20Siok%20Moi24.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Sains Kimia |
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Universiti Sains Malaysia |
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USM Institutional Repository |
| language |
English |
| topic |
QD1-999 Chemistry |
| spellingShingle |
QD1-999 Chemistry Khor, Siok Moi Activated Rice Husk-Based Adsorbents For Chlorophenol Removal And Their Bioregeneration |
| description |
The objectives of this study are to develop rice husk-based adsorbents
activated with different activating agents, namely potassium hydroxide (KRH), nitric
acid and methanol (ARH), and ethylenediamine (MRH), and compare their
adsorption capacities and bioregeneration efficiencies to remove 4-chlorophenol (4-
CP) and 2,4-dichlorophenol (2,4-DCP) from the aqueous solutions with the
commercially available powdered activated carbon (PAC).
From the adsorption equilibrium studies of 4-CP and 2,4-DCP, the trend of
maximum adsorption capacity, qm, among the adsorbents followed KRH > PAC >
ARH > MRH and in agreement with the trend of BET surface areas. The equilibrium
adsorption data of KRH and PAC were best described by the Langmuir model (R2 >
0.98) while the Freundlich model was suitable to describe the equilibrium adsorption
data for MRH and ARH (R2 > 0.99). These observations were confirmed by the
values of heterogeneity constant, μ, obtained from the Redlich-Peterson model. It
could be concluded that the adsorbent surfaces of MRH and ARH were
heterogeneous, while those of the KRH and PAC were homogenous. For the
temperature-dependent Temkin and Dubinin-Radushkevich isotherm models, the
Dubinin-Radushkevich model was better fitted to the experimental data than the
Temkin model. |
| format |
Thesis |
| qualification_name |
Doctor of Philosophy (PhD.) |
| qualification_level |
Doctorate |
| author |
Khor, Siok Moi |
| author_facet |
Khor, Siok Moi |
| author_sort |
Khor, Siok Moi |
| title |
Activated Rice Husk-Based Adsorbents
For Chlorophenol Removal And Their
Bioregeneration |
| title_short |
Activated Rice Husk-Based Adsorbents
For Chlorophenol Removal And Their
Bioregeneration |
| title_full |
Activated Rice Husk-Based Adsorbents
For Chlorophenol Removal And Their
Bioregeneration |
| title_fullStr |
Activated Rice Husk-Based Adsorbents
For Chlorophenol Removal And Their
Bioregeneration |
| title_full_unstemmed |
Activated Rice Husk-Based Adsorbents
For Chlorophenol Removal And Their
Bioregeneration |
| title_sort |
activated rice husk-based adsorbents
for chlorophenol removal and their
bioregeneration |
| granting_institution |
Universiti Sains Malaysia |
| granting_department |
Pusat Pengajian Sains Kimia |
| publishDate |
2013 |
| url |
http://eprints.usm.my/43534/1/Khor%20Siok%20Moi24.pdf |
| _version_ |
1747821235420528640 |