WANG Kai, SUN Lingling, QIU Guangming, CHEN Weiwei, CAI Jinli
Journal of Functional Materials. 2019, 50(2): 2133-2138.
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The fly ash zeolite was prepared by hydrothermal method using fly ash as raw material. The prepared adsorbent was characterized by means of SEM, XRD and nitrogen adsorption isotherms (BET). The synthesized fly ash zeolite had perfect crystallinity and was porous. The effects of different pH, fly ash zeolite dosage, initial concentrations, temperature and adsorption time on the adsorption performance of orange G were investigated. The results showed that the synthesized fly ash zeolite had a strong potential for orange G removal. The highest adsorption capacity could be obtained when pH was around 4. The adsorption on the fly ash zeolite reached equilibrium within 60 min and the process followed pseudo-second-order kinetic. Under 25 ℃, the highest adsorption capacity was approximately 45.6 mg/g. Langmuir isothermal adsorption mathematical model could well fit the adsorption of orange G on fly ash-based zeolite, indicating that the adsorption process was monolayer adsorption.