Adsorption behavior of phosphate on Lanthanum(III) doped mesoporous silicates material

Zhang, Jianda; Shen, Zhemin; Shan, Wenpo; Chen, Ziyan; Mei, Zhijian; Lei, Yangming; Wang, Wenhua

doi:10.1016/s1001-0742(09)60141-8

Cited by 109 publications

(37 citation statements)

References 17 publications

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“…Similar results were observed in the phosphate adsorption onto other lanthanum-modified adsorbents, such as lanthanum-loaded granular ceramic [45], lanthanum-doped mesoporous silicates [46], and lanthanum-treated lignocellulosic sorbents [36]. In particular, the rate constants (k) derived from the adsorption kinetic data by using La 5 EV in the solution with initial concentrations of 20 mg P/L, 50 mg P/L and 80 mg P/L are 0.105 g/mg/h, 0.0416 g/mg/h and 0.00366 g/mg/h, respectively.…”

Section: Phosphate Adsorption Kineticssupporting

confidence: 83%

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Huang

Liu

et al. 2014

Chemical Engineering Journal

275

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract:La(OH) 3 -modified exfoliated vermiculites were fabricated, characterized, and investigated for phosphate removal in batch tests for the first time. The BET surface area of the La 5 EV adsorbent, which was synthesized in the solution consisting of 5.00 mmol/g La/exfoliated vermiculite (EV), was significantly increased, accompanied with a larger pore diameter and greater total pore volume, as compared with the unmodified EV. The phosphate adsorption capacity of La 5 EV was approximately one order of magnitude higher than that of EV. Effects of initial phosphate concentration, contact time, temperature, pH, and 2 co-existing ions on the adsorption capacity of La 5 EV were investigated in detail. The experimental equilibrium data were fitted better by using the Langmuir model (maximum adsorption capacity of 79.6 mg P/g) than the Dubinin-Radushkevich or the Freundlich model, suggesting that the adsorption feature be monolayer. Meanwhile, the phosphate adsorption kinetics could be well described by the pseudo-second-order model, and the adsorption process might be controlled by boundary layer (film) diffusion. ∆G°, ∆H° and ∆S° were also determined, in which it was found that the phosphate adsorption , and SO 4 2-had neglectable effects on its phosphate removal capacities. In the synthetic secondary treated wastewater with a low phosphate concentration of 2 mg P/L, 97.9 % of its final adsorption capacity reached in the first 10 min and the phosphate concentration dramatically decreased below 50 µ g P/L. The spent La 5 EV could be regenerated and reused in phosphate adsorption; that could remove more than 70 % phosphate in the 3 rd adsorption-desorption cycle.

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Section: Phosphate Adsorption Kineticssupporting

confidence: 83%

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Huang

Liu

et al. 2014

Chemical Engineering Journal

275

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“…Obviously, the maximum adsorption capacity of FMS-0.1La, 42.82 mg P/g, is superior to those of La-doped MCM-41 (7.18 mg P/g) [17], La-coordinated amino-functionalized MCM-…”

Section: Accepted Manuscriptmentioning

confidence: 89%

Enhanced adsorption of phosphate by flower-like mesoporous silica spheres loaded with lanthanum

Huang

Tang

et al. 2015

Microporous and Mesoporous Materials

101

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Monodispersed flower-like mesoporous silica spheres doped with lanthanum were synthesized via a facile method and explored as novel adsorbents for efficient phosphate adsorption for the first time. The synthesized adsorbents possessed a flower-like structure, especially with unique mesoporous channels featuring with small inner pores and wide outer pores. By raising lanthanum loading, the surface areas and pore volumes of resulting adsorbents were observed to continuously decrease, accompanied with gradually increasing pore sizes; that led to a dramatic improvement in phosphate adsorption from water. By taking cost effectiveness for practical application into consideration, the adsorbent with a theoretical La/Si molar ratio of 0.1 possessed a promising performance as compared to the literature ever reported, thanks to the large outer mesopores likely minimizing the diffusion problem caused M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT2 by the pore blocking when LaPO 4 nanorods formed during adsorption. In the kinetic study, its phosphate adsorption followed the pseudo-second-order equation better, suggesting chemisorption. Meanwhile, superior phosphate adsorption capacities were achieved within the pH range of 3.0 and 6.0; and almost unaffected by the presence of F − , Cl − , NO 3− , and SO 4 2-.

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“…At present, lanthanum have attracted more attention due to their high phosphate adsorption capacity [20][21][22][23][24], nontoxity and environment-friendly property [25]. However, lanthanum oxide is difficult to be recycled because it usually presents as a powder which tends to sink down to the bottom of the water bodies during phosphorous removal.…”

Section: Introductionmentioning

confidence: 99%

Removal of phosphate from water by activated carbon fiber loaded with lanthanum oxide

Zhang

Wan

Chang

et al. 2011

Journal of Hazardous Materials

173

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Adsorption behavior of phosphate on Lanthanum(III) doped mesoporous silicates material

Cited by 109 publications

References 17 publications

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Enhanced adsorption of phosphate by flower-like mesoporous silica spheres loaded with lanthanum

Removal of phosphate from water by activated carbon fiber loaded with lanthanum oxide

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