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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| Format: | Thesis |
| Language: | English |
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2013
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| Online Access: | http://eprints.usm.my/43534/ http://eprints.usm.my/43534/1/Khor%20Siok%20Moi24.pdf |
| _version_ | 1848879837782999040 |
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| author | Khor, Siok Moi |
| author_facet | Khor, Siok Moi |
| author_sort | Khor, Siok Moi |
| building | USM Institutional Repository |
| collection | Online Access |
| 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. |
| first_indexed | 2025-11-15T17:53:35Z |
| format | Thesis |
| id | usm-43534 |
| institution | Universiti Sains Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T17:53:35Z |
| publishDate | 2013 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | usm-435342019-04-12T05:26:16Z http://eprints.usm.my/43534/ Activated Rice Husk-Based Adsorbents For Chlorophenol Removal And Their Bioregeneration 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 NonPeerReviewed application/pdf en http://eprints.usm.my/43534/1/Khor%20Siok%20Moi24.pdf Khor, Siok Moi (2013) Activated Rice Husk-Based Adsorbents For Chlorophenol Removal And Their Bioregeneration. PhD thesis, Universiti Sains Malaysia. |
| spellingShingle | QD1-999 Chemistry Khor, Siok Moi Activated Rice Husk-Based Adsorbents For Chlorophenol Removal And Their Bioregeneration |
| title | 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_short | Activated Rice Husk-Based Adsorbents
For Chlorophenol Removal And Their
Bioregeneration |
| title_sort | activated rice husk-based adsorbents
for chlorophenol removal and their
bioregeneration |
| topic | QD1-999 Chemistry |
| url | http://eprints.usm.my/43534/ http://eprints.usm.my/43534/1/Khor%20Siok%20Moi24.pdf |