Impact of Surface Chemistry on the Removal of Indigo Carmine Dye Using Apricot Stone Active Carbon
A biomass agricultural waste material, i.e. apricot stone, was used as an adsorbent either as received (AP), after carbonization at 500°C (C-AP), and after chemical activation using H 3 PO 4 (H-APC) or using KOH (K-APC) followed by carbonization at 500°C. The four adsorbents were characterized by va...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2007-06-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/026361707783432588 |
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| Summary: | A biomass agricultural waste material, i.e. apricot stone, was used as an adsorbent either as received (AP), after carbonization at 500°C (C-AP), and after chemical activation using H 3 PO 4 (H-APC) or using KOH (K-APC) followed by carbonization at 500°C. The four adsorbents were characterized by various techniques (e.g. BET specific surface area measurements, FT-IR spectroscopy and measurements of the total pore volume, density, pH and moisture content). Preliminary investigations showed that the highest uptake was exhibited by K-APC. Factors affecting the removal of Indigo Carmine (IC) dye using K-APC were investigated. The amounts of co-existing ions as well as those removed during the desorption process were determined quantitatively. The results obtained were examined using two-parameter equilibrium models (Langmuir and Freundlich equations). Studies of the process at 30, 50 and 70°C demonstrated that adsorption was endothermic. The effects of cations, e.g. K + , Na + , Ca 2+ , Mg 2+ and Al 3+ , on dye removal were investigated. The monolayer capacity of K-APC was 552.5 mg/g. The proposed mechanism suggests that surface chemistry rather than the surface texture of the activated carbon plays a significant role in the process. Thus, K-APC can be considered as a novel adsorbent for the removal of IC dye from waste effluents. |
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| ISSN: | 0263-6174 2048-4038 |