Volume 10 Issue 5
Sep.  2020
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LIU Yongde, MA Lin, SUN Xuzhuo, ZHAO Hailiang, LI Bo, WAN Dongjin, XIAO Shuhu. Adsorption characteristics and influencing factors of cucurbit[6] uril for dye eosin Y from printing and dying wastewater[J]. Journal of Environmental Engineering Technology, 2020, 10(5): 837-844. doi: 10.12153/j.issn.1674-991X.20200019
Citation: LIU Yongde, MA Lin, SUN Xuzhuo, ZHAO Hailiang, LI Bo, WAN Dongjin, XIAO Shuhu. Adsorption characteristics and influencing factors of cucurbit[6] uril for dye eosin Y from printing and dying wastewater[J]. Journal of Environmental Engineering Technology, 2020, 10(5): 837-844. doi: 10.12153/j.issn.1674-991X.20200019

Adsorption characteristics and influencing factors of cucurbit[6] uril for dye eosin Y from printing and dying wastewater

doi: 10.12153/j.issn.1674-991X.20200019
  • Received Date: 2020-02-17
  • Publish Date: 2020-09-20
  • The adsorption characteristics of cucurbit[6]uril (CB[6]) for the typical dye eosin in printing and dyeing wastewater were investigated. The effects of initial pH, adsorbent dosage and co-existing ions on the adsorption effect were studied, and the adsorption mechanism was discussed. The results showed that the adsorption removal efficiency was 79.5% after 2 hours when the initial concentration of eosin Y (EY) was 20 mg/L at 25 ℃ and the dosage of CB[6] was 0.5 g/L, and the adsorption kinetics characteristics was consistent with the pseudo-second-order kinetic equation. The Langmuir isotherm model had higher correlation coefficient than Freundlich model. The maximum adsorption capacity calculated using Langmuir model was 413.05 mg/g, and with the increase of the temperature, the maximum adsorption capacity of CB[6] decreased, indicating that the adsorption process of CB[6] was exothermic. As the initial pH of the solution increased from 3 to 11, the adsorption capacity decreased from 33.28 mg/g to 9.14 mg/g. The adverse effects of coexisting anions on adsorption were in the order of PO3-4>CO2-3>NO-2>NO-3. CB[6] was recyclable and retained 84.9% adsorption capacity of the original material after 3 times of regeneration using Fenton reagent. The samples were characterized by BET,1H NMR, IR and SEM. The electrostatic potential distribution map of CB[6] was analyzed by the density functional theory (DFT), which revealed that the possible adsorption principle of CB[6] was that the “waist” of CB[6] and the hydrolysate of EY in the form of anions generated electrostatic attraction, thus forming a supramolecular outsourcing package.

     

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