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| Adsorption of fluorescent whitening agent-VBL in the waste water by TiO2@yeast microspheres and regeneration research |
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Abstract TiO2@yeast microspheres with a unique raspberry-like structure were prepared through electrostatic- interaction-driven self-assembly heterocoagulation. The obtained TiO2@yeast microspheres were subsequently used as adsorbents for removal of anionic fluorescent whitening agent-VBL (FWA-VBL) from aqueous solutions. The adsorption characteristics were determined by investigating factors such as pH, initial concentration and adsorbent dose, respectively. The adsorption equilibrium data were best represented by the Langmuir isotherm model, and the maximum adsorption capacity of the sorbent was 167.50mg/g at the temperature of 323.15K. The adsorption kinetic was found to follow the pseudo-second-order kinetic model. Thermodynamic parameters indicated that the adsorption was a spontaneous and endothermic process. Due to the coupling effects of photo-catalytic function and adsorption, TiO2@yeast microspheres show desired in-situ regeneration. Additionally, adding H2O2 could improve the regeneration performance of TiO2@yeast microspheres.
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Received: 20 December 2014
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