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- Title
Batch adsorption of p -nitrophenol by ZSM-11: equilibrium, kinetic, and thermodynamic studies.
- Authors
Lu, Mang; Cheng, Yue; Pan, Shun-long; Wei, Gui-ying
- Abstract
In this study, ZSM-11 zeolite was successfully prepared by direct hydrothermal synthesis using silica sol as silicon source and tetrabutylammonium hydroxide as organic structure directing agent. X-ray diffraction confirmed the prepared product was well-crystalline ZSM-11 zeolite. Scanning electron microscopy showed that a single particle of the prepared product had a mean size of approximately 2.5 μm × 6 μm. Batch adsorption experiments exhibited that solution pH, ZSM-11 dosage, and NaCl concentration had effects on PNP (p-nitrophenol) removal. A high adsorption capacity of 56.3 mg/g was obtained at pH 4, 25°C, ZSM-11 dosage of 0.3 g/L, and initial PNP concentration of 20 mg/L. The addition of NaCl (5.8–580 mg/L) exerted a positive impact on PNP adsorption. Results of desorption experiments showed that a desorption percentage of 78.9% could be obtained in 120 min using 1.44% NaOH solution as desorbent. The equilibrium adsorption data of PNP onto the as-prepared samples were well fitted by the Freundlich isothermal model in the temperature range 25–45°C. The adsorption kinetics was found to obey the pseudo-second-order model. Thermodynamically, it was found that the adsorption of PNP onto ZSM-11 was spontaneous and enthalpy-driven with ∆H° = −10.96 kJ/mol. The ZSM-11 samples were found to be effective adsorbent for the removal of PNP from wastewater.
- Subjects
SILICALITE; ZEOLITES; NITROPHENOLS; ADSORPTION isotherms; ADSORPTION kinetics
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 7, p3029
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2014.983986