Adsorption Experiments and Kinetics of an Efficient Absorbent for Cd(II)

TiO 2 (M)/CS(G) adsorbent was synthesized by modified TiO 2 and chitosan (CS); M is γ-methacryloxypropyl, G is glycidyl methacrylate. The influence factors for the maximum absorption wavelength (λ max ) and standard curve of Cd(II) have time on blank reagent, color development time, acidity, rhodamine B, ascorbic acid and polyvinyl alcohol (PVA), which were studied by UV–Vis spectrophotometry. The results showed that the of λ max of Cd(II) is 600 nm, the linear regression equation is y = 0.0242 x + 0.1771, correlation coefficient ( R 2 ) is 0.9995. The adsorption performance of the adsorbent is affected by the adsorption time, adsorption temperature, adsorbent dosage and pH. The kinetics of the adsorbent for Cd(II) were studied. The adsorption process includes three stages: surface diffusion, particle internal diffusion and adsorption equilibrium diffusion. Finally, the maximum adsorption capacity ( q max ) of TiO 2 (M)/CS(G) adsorbent for Cd(II) is 558.66 mg/g.