Combustion synthesis and stability of nanocrystalline La2O3 via ethanolamine-nitrate process

Long, Yulin; Yang, Jun; Li, Xiaoci; Huang, Weiya; Tang, Yu; Zhang, Yuanming

doi:10.1016/s1002-0721(10)60637-0

Cited by 25 publications

(7 citation statements)

References 27 publications

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“…More interestingly, the formed La(OH) 3 showed an excellent phosphate adsorption performance with the maximum adsorption capacity of 57.8 mg P/g, estimated via the Langmuir model [22]. Therefore, the objective of our work is to modify EV by La(OH) 3 and investigate its use for phosphate removal in batch tests, which to the best of our knowledge is reported for the first time.…”

mentioning

confidence: 92%

“…Our previous study has found that the synthesized La 2 O 3 was chemically unstable and completely transformed to La(OH) 3 when exposed to air at ambient temperature [22], which is in a good agreement with literature, that this oxide material rapidly hydroxylated to form a stable hydroxide [23]. More interestingly, the formed La(OH) 3 showed an excellent phosphate adsorption performance with the maximum adsorption capacity of 57.8 mg P/g, estimated via the Langmuir model [22].…”

mentioning

confidence: 99%

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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

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286

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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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confidence: 92%

mentioning

confidence: 99%

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

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286

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“…optical displays, medical diagnostics, and chemical catalysis [11]. Recent studies have revealed their great potential as prominent materials to efficiently remove a number of pollutants from water, including phosphate anions [11][12][13][14][15][16][17]. For instance, our previous study found that La(OH) 3 particles exhibited a promising maximum phosphate adsorption capacity, which was 57.8 mg P/g [17].…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have revealed their great potential as prominent materials to efficiently remove a number of pollutants from water, including phosphate anions [11][12][13][14][15][16][17]. For instance, our previous study found that La(OH) 3 particles exhibited a promising maximum phosphate adsorption capacity, which was 57.8 mg P/g [17]. Our recent work reported the preparation of La(OH) 3 -doped exfoliated vermiculite (La-EV); its phosphate uptake was approximately one order of magnitude greater than that of undoped natural exfoliated vermiculite [18].…”

Section: Introductionmentioning

confidence: 99%

Porous Pr(OH)3 nanowires as novel high-performance adsorbents for phosphate removal

Tang

Chen

Huang

et al. 2014

Chemical Engineering Journal

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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:Porous Pr(OH) 3 nanowires (NWs), which were synthesized via an electrodeposition approach, were utilized in phosphate removal for the first time. Our prepared porous Pr(OH) 3 NWs exhibited superior phosphate removal performances, due to their large surface area, unique porous structure, and abundant hydroxyl groups as active sites. Their phosphate adsorption equilibrium data were well described by utilizing the Langmuir isotherm model (R 2 ≥ 0.996), with a maximum phosphate adsorption capacity of 128.96 mg P/g at 25 °C. The thermodynamic study showed that the phosphate adsorption of Pr(OH) 3 NWs was a spontaneous and exothermic process. On the other hand, the phosphate adsorption kinetics was well described with the use of the pseudo-second-order model, suggesting the adsorption process be chemisorption. In the pH range of 3.0 -10.0, the high adsorption capacities of Pr(OH) 3 NWs were observed; whilst, the presence of Cl − , HCO 3 − , or NO 3 − did not dramatically affect the phosphate uptake. Our experimental results 2 strongly suggest that the use of porous Pr(OH) 3 NWs hold a great potential in achieving highly efficient phosphate removal in practical water treatment.

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“…Although there are only a few reports on preparation and luminescence of rare earth doped La 2 O 3 -based phosphors [20][21][22][23][24][25] its low phonon energy ∼ 400 cm −1 , [20] makes them a potential material for up-and down-converting phosphors [20][21][22][23][24][25]. However, lanthanum-oxide based materials have to be managed with precaution due to their high sensitivity to the ambient conditions [26,27]. Due to the most pronounced red emission, europium-doped materials are commonly known as red phosphors.…”

Section: Introductionmentioning

confidence: 99%

The concentration quenching of photoluminescence in Eu3+-doped La2O3

Đorđević¹,

Antić²,

Nikolić³

et al. 2013

Journal of Research in Physics

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This work explores the influence of dopant concentration on photoluminescent emission and kinetics of Eu 3+ -doped (0.2−10 at.%) nanocrystalline lanthanumoxide powders. The X-ray diffraction analysis confirmed that all samples crystallize in La 2 O 3 hexagonal phase with space group P3m1. Transmission electron microscopy showed particles with non-uniform shape and diverse size distribution with an average particle size of (95 ± 5) nm. The room temperature photoluminescence spectra of all samples contain characteristic Eu 3+ luminescence lines with the most pronounced red 5 D 0 → 7 F 2 emission at about 626 nm. The maximum intensity of red emission is observed for the sample containing 5 at.% of Eu 3+ ions. The emission kinetics was recorded in the temperature range from 10 K to 300 K. The maximum lifetime value of 0.98 ms obtained for the sample with 0.5 at.% Eu 3+ at room temperature increases up to 1.3 ms at 10 K.

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Combustion synthesis and stability of nanocrystalline La2O3 via ethanolamine-nitrate process

Cited by 25 publications

References 27 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

Porous Pr(OH)3 nanowires as novel high-performance adsorbents for phosphate removal

The concentration quenching of photoluminescence in Eu3+-doped La2O3

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