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Activated Carbon: Spent, Regenerated and Reuse for Synthetic Dyestuff Effluent Decolorization
Current Issue
Volume 4, 2017
Issue 4 (August)
Pages: 29-37   |   Vol. 4, No. 4, August 2017   |   Follow on         
Paper in PDF Downloads: 29   Since Aug. 1, 2017 Views: 1106   Since Aug. 1, 2017
Authors
[1]
Adams Udoji Itodo, Department of Chemistry, Federal University of Agriculture, Makurdi, Nigeria.
[2]
Festus Kayode Oketunde, Department of Chemistry, Federal University of Agriculture, Makurdi, Nigeria.
Abstract
Received Commercial Activated Carbon (VCAC) was spent and restored as Regenerated Activated Carbon (RCAC) using the chemical (acid) method. Regenerants were utilized for the decoloration of synthetic dyestuff effluent, simulated with Congo red (CR), an anionic dye. The efficiency of VCAC and RCAC were evaluated under different parametric factors such as pH, contact time, adsorbent dosage and initial concentration. A removal efficiency of over 84% was achieved in both experimental runs. Batch adsorption of Congo red (as adsorbate) onto VCAC and RCAC was carried out at constant temperature. Generated data were fitted into four different isotherm models viz: Langmuir isotherm, Freundlich isotherm, Temkin isotherm and Dubinin-Radushkevich isotherm models. Best fit model was predicted using good fit predicted from correlation coefficient (R2) values. The Langmuir isotherm gave the highest fit (R2=0.996) and the maximum monolayer adsorption capacity was 0.108 mg/g. The validity of Langmuir isotherm model confirmed a monolayer surface coverage of the CR onto RCAC surface with uniform site energies. From the overall, the adsorption phenomenon investigated for RCAC compares well with VCAC implying that spent CAC could be regenerated and reused for dyestuff effluent remediation.
Keywords
Adsorption, Isotherm, Regeneration, Congo Red, Dye, Effluent
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