Sorp tion processes of h eavy metals by natural and m odified b entonite using nano particles

Recently, the usag e of natural mineral adsorbents for wastewater treatment is increasing due to their abundance and low price . One type of clay min erals is bent onite, the main component of which is montmorillonite. Its high specific surface area and cation exchange capacity makes bento nite a useful clay mine ral for the decontamin ation of he avy metal ions [۱]. S pecial treatment-modification cause bentonite is rendered a better adsorbent material [۲]. Treatment by ino rganic acids and satur ation of montmorillonite by cation s is the method most w idely used to modify th e sorptive p roperties of bentonite clays [۳]. Simple ion-ex change rea ctions can significantly modify the surface properties of natural be ntonite. Then the satu rated bento nite with special cation (Na+) can be replaced by nano particles.This s tudy aimed to investigate and co mparative th e sorption properties o f natural Iranian bento nite, and modified bento nite with nano particles (TiO۲, Al۲O۳), including, their re moval efficiency, the sorption isotherms and the effect of the initial sol ution pH with Cd۲+, Cu۲ + and Ni۲+ on adsorption .

کلیدواژه ها:

Adsorption ، Bentonite ، Modify ، Nano particle.