Adsorption Characteristics of Stone-Bentonite Mixtures towards Zn: Equilibrium and Kinetic Tests
| Autor: | Wang Zhe, Cuifeng Li, Fu Yajun, Mengdan Bian, Wei Weiwei, Xu Sifa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Langmuir
Materials science Diffusion Metal ions in aqueous solution Inorganic chemistry Bioengineering 02 engineering and technology 010501 environmental sciences lcsh:Chemical technology 01 natural sciences lcsh:Chemistry zeta potential Adsorption heavy metal of Zn Zeta potential Chemical Engineering (miscellaneous) Freundlich equation dynamic isothermal adsorption lcsh:TP1-1185 0105 earth and related environmental sciences stone-bentonite Ion exchange Process Chemistry and Technology 021001 nanoscience & nanotechnology equilibrium isothermal adsorption lcsh:QD1-999 Bentonite 0210 nano-technology |
| Zdroj: | Processes, Vol 9, Iss 619, p 619 (2021) Processes Volume 9 Issue 4 |
| ISSN: | 2227-9717 |
| Popis: | In the treatment of industrial polluted sites and the construction of landfill sites, anti-pollution barriers are usually used to prevent the diffusion of pollutants. In this paper, the adsorption characteristics of Zn ions by the rock-bentonite anti-pollution barrier were observed by means of static equilibrium and dynamic adsorption tests. The experimental results showed that the adsorption of Zn by stone chips—bentonite was close to the nonlinear Freundlich and Langmuir models. When the concentration of Zn ion is constant, the adsorption capacity increases with the increase in temperature. At a certain temperature, the adsorption removal rate decreases with the increase in concentration. Further study found that the adsorption of Zn from mixed soil was mainly an ion exchange process, and the adsorption mode of Zn from mixed soil was controlled by both intra-particle diffusion and membrane diffusion. Zeta potential, X-ray diffraction (XRD) and The Fourier Transform Infrared spectroscopy (FTIR) showed that with the increase in concentration, the mixed soil adsorbed more metal ions, and the thickness of the double electric layer decreased. Moreover, the adsorption of Zn2+ by bentonite was mainly interlayer adsorption and ion exchange. As an anti-pollution barrier material, the mixed soil of stone chips -bentonite can prevent the diffusion of pollutants, which has certain reference significance for engineering construction. |
| Databáze: | OpenAIRE |
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