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Adsorbent Dosage Research Paper

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Adsorbent Dosage:
The effect of sorbent dosage on the removal of chromium (VI) ions from waste waters were studied by varying the sorbent concentration from 0.5 to 5.0g/lit at pH-2, agitation time 70min, Chromium ion concentration: 50mg/lit and constant temperature of 30±1oC. A graph is drawn between the percentage removal of chromium and adsorbent dosage and is presented in fig -9 Fig-9: % removal of chromium (VI) as a function of adsorbent dose
As we seen from the graph the percent removal of chromium ion increases with an increase in the adsorbent dosage. The maximum removal of chromium (VI) ions is attained at 3.5g/lit and then onwards there is no further removal of chromium (VI) ions with increase of adsorbent dosage. The result can be explained as initially the bio-sorption sites remain unsaturated for the period of adsorption process and the number of bio-sorption sites increases with increase of …show more content…

As seen from fig-10 that NSAC is active in acidic range especially at low pH range [71]. The maximum adsorption of chromium (VI) concentration on the adsorbent was at pH - 2.0 and negligible at pH-10. Chromium (VI) can exist several stable forms such as CrO42-, HCrO4-, Cr2O7-, HCr2O7- and the relative abundance of particular complex depends on the concentration of chromium (VI) ion and pH of solution. At low pH, the sorbent is positively charged because of adsorption of excess H+ on the surface. This prevailing positive nature on the liquid sorbent interface causes thrust for anions like dichromate ions exist mostly as an anion leading to a columbic attraction between the sorbent and the sorbate on the interface. So the adsorption of the chromium (VI) ions on the NSAC surface is supposed to be favored. As the pH of solution increases the sorbent undergoes deprotination and the sorption capacity decreases. Therefore all the subsequent studies were carried out at

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