Phosphorous removal from wastewater by lanthanum modified Y zeolites

Abstract

The adsorption capacities of Y zeolite and La (III)-modified Y zeolite were studied. A series of La(III)-modified Y zeolites with different La/Y zeolite mass ratios were characterized by X-ray diffraction, X-ray fluorescence and Brunauer-Emmett-Teller surface area analysis. Batch experiments were conducted to evaluate the effects of various experimental parameters, such as pH, ionic strength, coexisting anions (\mathrm{C}{\mathrm{O}}_{\mathrm{3}}^{\mathrm{2}-}, Cl^-, \mathrm{S}{\mathrm{O}}_{\mathrm{4}}^{\mathrm{2}-} and \mathrm{N}{\mathrm{O}}_{\mathrm{3}}^{-}) and temperature, on the phosphate adsorption. The capacity of the La (III)-modified Y zeolite to remove phosphate increased as the La/Y zeolite mass ratio increased and after 4 h, a phosphate removal efficiency of 95% was achieved for a La/Y zeolite mass ratio of 0.10. The equilibrium adsorption isotherm data correlated better to the Langmuir model than the Freundlich model and the data followed a pseudo-second-order kinetic equation.

Graphical abstract

Keywords

phosphate removal / wastewater / lanthanum / impregnation / Y zeolites

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Acknowledgements

The authors are also grateful to the Tianjin Natural Science Foundation (No. 12JCYBJ14000) for providing financial assistance for this investigation.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg