Phosphorous removal from wastewater by lanthanum modified Y zeolites

doi:10.1007/s11705-014-1448-4

Front. Chem. Sci. Eng.

2015, Vol. 9

Issue (2) : 209-215 https://doi.org/10.1007/s11705-014-1448-4

RESEARCH ARTICLE

Phosphorous removal from wastewater by lanthanum modified Y zeolites

Weikang ZHANG,Ye TIAN(

)

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

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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 (CO32-, Cl^-, SO42- and NO3-) 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.

Keywords phosphate removal wastewater lanthanum impregnation Y zeolites

Corresponding Author(s): Ye TIAN

Online First Date: 17 November 2014 Issue Date: 14 July 2015

Cite this article:

Ye TIAN,Weikang ZHANG. Phosphorous removal from wastewater by lanthanum modified Y zeolites[J]. Front. Chem. Sci. Eng., 2015, 9(2): 209-215.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-014-1448-4
https://academic.hep.com.cn/fcse/EN/Y2015/V9/I2/209

Tab.1 Elemental composition of Y zeolites and La-Y_x samples (in mass %)

Fig.1 XRD patterns of Y zeolites: (A) Na-Y zeolite, (B) H-Y zeolite, (3) La-Y_0.05, and (4) La-Y_0.10.

Tab.2 BET surface area of Y zeolites and La-Y_x samples

Fig.2 Effect of different mass ratios of La/Y on phosphate removal: (A) 20 mol·L^–1g La-Y_0.12, (B) 20 mol·L^–1g La-Y_0.10, (C) 20 mol·L^–1g La-Y_0.08, (D) 20 mol·L^–1g La-Y_0.05, (E) 20 mol·L^–1g La-Y_0.03,(F) 20 mol·L^–1g H-Y, (G) 20 mol·L^–1g Na-Y; P concentration= 1.0 mol·L^–1g·L^-1, pH= 6.3, 100 mol·L^–1L solution.

Fig.3 Adsorption isotherm of phosphate by La-Y_0.10. (—): Langmuir model; (- -): Freundlich model. 20 mol·L^–1g La-Y_0.10, pH= 6.3, 100 mol·L^–1L solution.

Tab.3 Estimated isotherm parameters for phosphate adsorption on La-Y_0.10

Fig.4 Adsorption kinetics of phosphate on La-Y_0.10. (—): pseudo-first-order model; (- -): pseudo-second-order model. 20 mol·L^–1g La-Y_0.10, P concentration= 5.0 mol·L^–1g·L^-1, pH= 6.3, 100 mol·L^–1L solution.

Tab.4 Kinetic parameters for phosphate adsorption on La-Y_0.10

Tab.5 Thermodynamic parameters for phosphate adsorption on La-Y_0.10

Fig.5 Effect of initial pH on adsorption capacity. 20 mol·L^–1g La-Y_0.10, P concentration= 5.0 mol·L^–1g·L^-1, 100 mol·L^–1L solution.

Fig.6 Effect of ionic strength on the adsorption of phosphate. 20 mol·L^–1g La-Y_0.10, P concentration= 1.0 mol·L^–1g·L^-1, 100 mol·L^–1L solution at pH= 6.3.

Fig.7 Effect of coexisting anions on the adsorption of phosphate. 20 mol·L^–1g La-Y_0.10, P concentration= 1.0 mol·L^–1g·L^-1, 100 mol·L^–1L solution at pH= 6.3.

Fig.8 Variation of adsorption capacity of La-Y_0.10 effected by regeneration times. 20 mol·L^–1g adsorbent, P concentration= 1.0 mol·L^–1g·L^-1, pH= 6.3, 100 mol·L^–1L solution.

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