科研之友
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摘要
In this study, cross-linked chitosan resins were prepared through inverse suspension and were used to adsorb congo red (CR). FT-IR spectra and SEM technique characterized the chitosan resins. The influences of contact time, temperature, adsorbent dose, initial concentration of CR, and pH of CR solution on the adsorption behavior were investigated. The results showed that the chitosan beads made from 5% chitosan in 2% aqueous acetic acid had smooth surface and strong mechanical strength. When the contact time was 60 min, temperature was 50 degrees C, adsorbent dose was 0.02 g, initial concentration of CR was 80 mg/L, and pH of CR solution was 7, the best adsorption capacity was obtained. The adsorption behavior can be fitted well by the Langmuir isotherm and also obeyed the pseudo-second-order kinetic expression. The intra-particle diffusion studies indicate that the diffusion step was not the only rate-limiting step. Thermodynamic studies illustrated that the adsorption reactions are exothermic and spontaneous in nature.
- 出版日期2014-12-6
- 单位华南师范大学
