Synthesis of Hydrotalcite-Like Material and its Complexes with Activated Carbon for Colour Removal

Hydrotalcite-like material and its complexes with activated carbon were prepared using activated carbon bought from a local manufacturer. The resulting material and its precursor were used as an adsorbent for removal of colour from natural peat water. The colour change of natural peat water was used as an indicator to measure the amount of humic substances being adsorbed. Various parameters affecting the adsorption process were studied. These include contact time, adsorbent dosage, anions and temperature. Characterization of the resulting samples before and after treated with natural peat water was carried out to see the physicochemical changes. X-ray diffractograms of the samples prepared showed the presence of sharp peaks which signifying high crystallinity. The basal spacing corresponding to the 003 reflection was found to be 7.9 A. The X-ray diffractograms of humic substances-adsorbed samples were almost similar and basal spacing of around 7.9 A was maintained. A reduction in BET and micropore surface area was observed for humic-sub stances-adsorbed samples. The filling of the pore with humic substances was presumably contributed to the reduction of surface area Adsorption kinetics showed that hydrotalcite was very effective in removing humic substances from natural peat water compared to its complexes with activated carbon and activated carbon itself Activated carbon was reactivated using potassium hydroxide (KOH) The resulting activated carbon was used as an adsorbent in the colour removal from methylene blue The reactivation of activated carbon at the concentration of 30% gave optimum value of BET and Langmuir surface area, 1389 m2/g and 1836 m2/g, respectively. Various factors affecting the adsorption process was studied which include contact time, pH and adsorbent dosage Adsorption kinetics showed that reactivated activated carbon (ACKOH) is a better adsorbent than original activated carbon (AC) due to its high surface area. The results also showed adsorption processes could be fitted to both Langmuir and Freundlich isotherms.

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