Journal
RSC ADVANCES
Volume 5, Issue 103, Pages 84410-84422Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra15592d
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Funding
- National Natural Science Foundation of China [21306176, 21276006, 21476270]
- Scientific Research Launching Foundation of Zhejiang University of Technology [G2817101103]
- Zhejiang Provincial Natural Science Foundation [LQ14B020002]
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Renewable beta-cyclodextrin (beta-CD) was immobilized onto the surface of hybrid silica using ethylenediamine as linking groups to construct an adsorbent in water treatment (CD@Si), and the obtained CD@Si was characterized through FT-IR, XPS, EDX, contact angle measurement, TGA, solid-state C-13 NMR, SEM, and XRD analyses. The effect of initial pH, contact time on the adsorption performance of CD@Si for p-nitrophenol, and the adsorption kinetics, adsorption isotherms, adsorption thermodynamics, reusability and adsorption mechanism were investigated systematically, which indicate that the adsorption of p-nitrophenol onto CD@Si is a very fast process. The adsorption equilibrium can be reached in 15 s with an acceptable equilibrium adsorption capacity of 69.6 mg g (1) at pH 7.0, which is much faster than many reported adsorbents based on beta-CD. The adsorption of p-nitrophenol onto CD@Si follows the pseudo-second-order model, obeys the Freundlich model, and is a feasible, spontaneous, and exothermic process which is more favorable at lower temperatures. And the formation of an inclusion complex and a hydrogen bond interaction are two origins of p-nitrophenol being adsorbed onto CD@Si. Additionally, CD@Si can be recycled and reused for at least five runs with an acceptable adsorption capacity, and is a very promising adsorbent for the fast adsorption of p-nitrophenol or its analogues from the aqueous phase. Additionally, this work also provides a strategy to increase the adsorption rate of adsorbents based on beta-CD.
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