A Comparison between cooking tea-waste and commercial activated carbon for removal of chromium from artificial wastewater


The compare Cr (VI) adsorption characteristics removing from artificial wastewater by using decolorized cooking tea waste (CTW) and commercial activated carbon (AC) were examined. Adsorption experiments were carried out in a batch process and various experimental Parameters such as effect of pH, rpm, temperature, adsorbent dosage, contact time, and initial chromium ion concentration on percentage removal have been studied. Adsorption process was found for two adsorbents to be highly pH dependent. The maximum removal took place at the pH 2. A significant fraction of the total Cr (VI) uptake was achieved within 180 min and initial concentration of 50 mg/L. The maximum efficiency of chromium removal was 99.5% and 99.4% for CTW and AC, respectively and maximum adsorption capacity of chromium ion by using AC and CTW were 42.42, 42.46 mg/g respectively. Studies showed that the Freundlich adsorption model better fitted with the results than Langmuir with R2 equal 0.991 and 0.974 for AC and CTW, respectively. The chromium uptake by the CTW and AC was best described by pseudo-second order rate model. This investigation verifies the possibility of using CTW as a low cost material for the removal of chromium from aqueous solution comparing with AC.