Adsorption Characteristics of Stone-Bentonite Mixtures towards Zn: Equilibrium and Kinetic Tests

In the treatment of industrial polluted sites and construction landfill sites, anti-pollution barriers are usually used to prevent diffusion pollutants. this paper, adsorption characteristics Zn ions by rock-bentonite barrier were observed means static equilibrium dynamic tests. The experimental results showed that stone chips—bentonite was close nonlinear Freundlich Langmuir models. When concentration ion is constant, capacity increases with increase in temperature. At a certain temperature, removal rate decreases concentration. Further study found from mixed soil mainly an exchange process, mode controlled both intra-particle membrane diffusion. Zeta potential, X-ray diffraction (XRD) Fourier Transform Infrared spectroscopy (FTIR) concentration, adsorbed more metal ions, thickness double electric layer decreased. Moreover, Zn2+ bentonite interlayer exchange. As material, chips -bentonite can pollutants, which has reference significance for engineering construction.