Combination of immobilized TiO2 and zero valent iron for efficient arsenic removal in aqueous solutions

Raez, Julia M.; Arencibia, Amaya; Segura, Yolanda; Arsuaga, Jesús M.; López-Muñoz, Marı́a José

doi:10.1016/j.seppur.2020.118016

Cited by 23 publications

(7 citation statements)

References 47 publications

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“…For example, CeO 2 NPs are widely used due to their wide range of applications in electrochemistry, such as electrode materials in supercapacitors and medicine, due to their antibacterial properties [ 3 ]. Additionally, TiO 2 NPs are broadly applied in photocatalysis, solar cells, biomedicine, chemical sensors, lithium storage [ 2 ] and have also been explored for heavy metal water cleaning purposes [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Strain and Grain Size Determination of CeO2 and TiO2 Nanoparticles: Comparing Integral Breadth Methods versus Rietveld, μ-Raman, and TEM

et al. 2021

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Various crystallite size estimation methods were used to analyze X-ray diffractograms of spherical cerium dioxide and titanium dioxide anatase nanoparticles aiming to evaluate their reliability and limitations. The microstructural parameters were estimated from several integral breadth methods such as Scherrer, Monshi, Williamson–Hall, and their variants: (i) uniform deformation model, (ii) uniform strain deformation model, and (iii) uniform deformation energy density model. We also employed the size–strain plot and Halder–Wagner method. For this purpose, an instrumental resolution function of an Al2O3 standard was used to subtract the instrumental broadening to estimate the crystallite sizes and strain, and the linear regression analysis was used to compare all the models based on the coefficient of determination. The Rietveld whole powder pattern decomposition method was introduced for comparison purposes, being the best candidate to fit the X-ray diffraction data of metal-oxide nanoparticles. Refined microstructural parameters were obtained using the anisotropic spherical harmonic size approach and correlated with the above estimation methods and transmission electron microscopy images. In addition, μ-Raman spectra were recorded for each material, estimating the mean crystallite size for comparison by means of a phonon confinement model.

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Section: Introductionmentioning

confidence: 99%

Strain and Grain Size Determination of CeO2 and TiO2 Nanoparticles: Comparing Integral Breadth Methods versus Rietveld, μ-Raman, and TEM

et al. 2021

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“…This fit is not as good comparison to previous methods. The strain values obtained for these samples were 1.287×10 -3 , 2.42×10 -3 and the stress values were 2.87 ×10 4 , 2.18×10 4 for CeO2 and TiO2, respectively.…”

Section: = 2 (22)mentioning

confidence: 85%

“…For example, CeO2 NPs are widely used due to their wide range of application in electrochemistry, such as electrode materials in supercapacitors, and medicine, due to their antibacterial properties [3]. On the other hand, TiO2 NPs are highly used in photocatalysis, solar cells, biomedicine, chemical sensors, and lithium storage [2],and have been also explored for heavy metal water cleaning purposes [4].…”

Section: Introductionmentioning

confidence: 99%

Strain and Grain Size of CeO<sub>2</sub> and TiO<sub>2</sub> Nanoparticles: Comparing Structural and Morphological Methods

Canchanya-Huaman¹,

Af²,

Pomalaya-Velasco³

et al. 2021

Preprint

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Various crystallite size estimation methods were used to analyze X-ray diffractograms of spherical cerium dioxide and donut-like titanium dioxide anatase nanoparticles aiming to evaluate their reliability and limitations. The microstructural parameters were estimated from Scherrer, Monshi, Williamson-Hall, and their variants: i) uniform deformation model, ii) uniform strain deformation model, and iii) uniform deformation energy density model, and also size-strain plot, and Halder-Wagner method. For that, and improved systematic Matlab code was developed to estimate the crystallite sizes and strain, and the linear regression analysis was used to compare all the models based on the coefficient of determination, where the Halder Wagner method gave the highest value (close to 1). Therefore, being the best candidate to fit the X-ray Diffraction data of metal-oxide nanoparticles. Advanced Rietveld was introduced for comparison purposes. Refined microstructural parameters were obtained from a nanostructured 40.5 nm Lanthanum hexaboride nanoparticles and correlated with the above estimation methods and transmission electron microscopy images. In addition, electron density modelling was also studied for final refined nanostructures, and μ-Raman spectra were recorded for each material estimating the mean crystallite size and comparing by means of a phonon confinement model.

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“…Benefiting from multiple synergetic effects, the nanohybrids of metal species on semiconductors exhibit various improved photoactivity, which brings more opportunities for achieving the desired applications of photocatalysis in environmental remediation, including oxidation/degradation of organic pollutants, [91–104] conversion of CO 2 , [105–114] reduction of toxic high‐valence metal ions, [115–126] and photocatalytic antibacterial [127–136] …”

Section: Environmental Applications Of Metal‐hybridized Photocatalystsmentioning

confidence: 99%

“…Besides Cr(VI) ions, other heavy metal ions can also be converted into safe products via photocatalytic reaction. For example, TiO 2 /Fe 0 was synthesized by immobilizing TiO 2 on a glass carrier followed by synthesis of metallic nanoiron, which was used to remove arsenic from aqueous solution [122] . Under UV irradiation, As(III) ions in a concentration of 10 mg L −1 were mostly oxidized to As(V) within 90–180 min, and the final As(III) concentration was below the upper limit determined by the World Health Organization for human health.…”

Section: Environmental Applications Of Metal‐hybridized Photocatalystsmentioning

confidence: 99%

Metal‐facilitated Photocatalytic Nanohybrids: Rational Design and Promising Environmental Applications

Guan

Zhang

Neng

et al. 2021

Chemistry An Asian Journal

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As a promising technique to potentially address the energy crisis and environmental issues, photocatalysis has been reported widely to exhibit various outstanding behaviors in production of new fuels/chemicals and treatment of contaminants. The photocatalytic performance is extremely dependent on the used photocatalysts, so that the design and preparation of efficient photocatalysts are critically important for significantly improving the photocatalytic activity. Among various strategies, the hybridization of metal with semiconductors has recently been attracting more and more research interest owing to their expended spectral absorption, promoted transferring rate of charge carriers and Plasmon‐enhanced effect. In this minireview, the metal‐facilitated hybrid photocatalysts are overviewed comprehensively to first reveal unique functions of metals in improvement of photoactivity and summarize the emerging metal‐involved hybrid systems. Subsequently, the synthetic methods towards hybrid photocatalysts are introduced and their practical applications are emphasized in environmental remediation including degradation of organic pollutants, conversion of harmful gases, treatment of heavy metal ions and sterilization of bacteria. At the end, the challenges for industrializing these hybrid photocatalysts are discussed carefully and future development is suggested rationally.

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Combination of immobilized TiO2 and zero valent iron for efficient arsenic removal in aqueous solutions

Cited by 23 publications

References 47 publications

Strain and Grain Size Determination of CeO2 and TiO2 Nanoparticles: Comparing Integral Breadth Methods versus Rietveld, μ-Raman, and TEM

Strain and Grain Size Determination of CeO2 and TiO2 Nanoparticles: Comparing Integral Breadth Methods versus Rietveld, μ-Raman, and TEM

Strain and Grain Size of CeO<sub>2</sub> and TiO<sub>2</sub> Nanoparticles: Comparing Structural and Morphological Methods

Metal‐facilitated Photocatalytic Nanohybrids: Rational Design and Promising Environmental Applications

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