Batch kinetics and thermodynamics of chromium ions removal from waste solutions using synthetic adsorbents.

摘要: Mg(OH)(2) was identified as a component in the magnesia cement being adsorbent for Cr(VI). Modified prepared by addition of ferric chloride and humic acid. The equilibrium adsorption Cr(VI) on adsorbents (MF5-1) (MF5-2) investigated function contact time, weight, solute concentration temperature. Tests different isotherms have shown that data fit Langmiur Freundlich at 25+/-1 degrees C. nature diffusion process responsible discussed. kinetics mechanism into from aqueous solution been studied concentrations reaction temperatures. MF5-1 MF5-2 follows first-order reversible kinetics. forward backward constants, k(1) k(2) calculated temperatures between 10 50 heat activation adsorption, DeltaH(*) DeltaS(*) were 25 values found 18.1 10.7 kJ mol(-1) MF5-2, respectively, while entropy change, DeltaS(*), -106.8 -118.6 J mol(-1)K(-1) respectively. study showed pore is rate-determining step ions MF5-2. more efficient than MF5-1. Also can be adsorbed whereas Cr(III) cannot. So, competitive multi-metals onto studied. studies this used an material removal water nuclear power plant coolant water.