Adsorbent Produced by Ball Clay with Coconut Shell or Palm Shell for Hexavalent Chromium Adsorption in Synthetic Wastewater

Abstract

The purposes of this research were to study factors involving in preparation of adsorbent fromball clay mixed with coconut shell and palm shell and compare their adsorption efficiencies Cr(VI)with activated carbon. (At first, the experiments were performed to determine the proper condition)The adsorbents prepared by varying pyrolysis temperature and mixing ratio between ball clay andfruit shells for the optimum conditions. The results showed that the pyrolysis temperature, 800 °C andthe weight ratio of ball clay and coconut shell, and ball clay to palm shell were 20:80 and 10:90respectively. The Cr(VI) adsorption efficiency in were 99.02% for ball clay mixed with coconut shelland 96.66% for ball clay mixed with palm shell.

The suitable conditions in Cr(VI) adsorption of these two adsorbents were contact time for 4hours at pH 3. The maximum adsorption capacity of ball clay mixed with coconut shell and ball claymixed with palm shell were 11.08 and 8.20 mg/g respectively. However the adsorption capacity ofactivated carbon was at 47.40 mg/g. The result of adsorbent regenerated by leaching with weak acidor distilled water for 24 hours showed that chromium ions was not leach out. In continuous experimentof adsorbent from ball clay mixed with coconut shell, the results indicated†that the breakthroughvolume was†664.3 bed volumes.

Keywords : Adsorbent / Adsorption / Hexavalent Chromium / Ball Clay / Coconut Shell /Palm Shell