Removal of cr vi and f from aqueous solution using low cost adsorbents

Abstract

Adsorption process using low cost materials for the elimination and recovery of newlinetoxic metals/elements/ions from the aqueous stream are eco friendly, cost effective, easy to newlineoperate and toxic elements even at low concentration can also be removed. The main newlineobjective of the present study is to eliminate Cr(VI) and F- from the aqueous stream by newlineadsorption technique using some low cost materials as adsorbents. Out of different toxic newlinemetals/elements/ions Cr(VI) has been chosen because chromium is the only heavy metal newlinewhich is present in its ionic form in almost all types of industrial waste water. Similarly, Fis newlinealso toxic when present in excess amount and exists in different industrial waste water. It newlinecan contaminate natural water sources. The deterioration because of the mixed effect of newlineCr(VI) and F- in aqueous stream causes mass environmental burden, and hence its analysis newlineis of paramount interest. newlineBasing on literature and some preliminary studies four different adsorbents like newlineLagenaria siceraria (bottle gourd) peel, Bauxite (a mineral), Used aqua guard (water filter) newlinecarbon and Sand have been chosen. The adsorption capacities of naturally available low newlinecost materials are comparatively less. So, modification (mainly heat and acid treatment) of newlinethe adsorbent surfaces was accomplished so to improve the adsorption capacities and the newlinefurther studies were carried out using the modified adsorbents. After modification newlinehydrochloric acid treated Lagenaria siceraria peel (HLSP), Thermally treated bauxite newline(TTB) and sand without any modifications were used for both Cr(VI) and F- removal. But newline