Reactivation, oxidation and surface functionalization of spent activated carbon for glycerin decolourization
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Date
2018-06
Authors
Choo, Hong Han
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Abstract
After continuous use in adsorption process, the spent AC will be saturated
and unable to remove targeted adsorbate effectively. In this research, spent
activated carbon was reconverted into useful adsorbent via a re-activation
process, followed by oxidation and functionalization process to the carbon
materials. Oxidation of the surface of reactivated carbon was carried out to further
improve the adsorption capacity of the reactivated carbon. Oxidation of activated
carbon was done with using chemical oxidation of HNO3. Functionalization of the
reactivated and oxidized carbon was introduced through hydrophobic treatment,
for better glycerin decolourization. Ethylamine (EA) was used in the hydrophobic
treatment. FTIR was done toward all carbon material to conclude the presence
of functional group of COO- and CN bond. The adsorption of glycerin product was
evaluated before and after the hydrophobic functionalization. Functionalization
improved carbon adsorption of glycerin product by around 2.1%. Besides,
performance comparison of was decolourization was conducted between
industrial sample and lab sample was done. Lab RAC shows better result then
industry sample by 4.6%.