Fabrication of ZnFe-layered double hydroxides with graphene oxide for efficient visible light photocatalytic performance

Motlagh, Parisa Yekan; Khataee, Alireza; Rad, Tannaz Sadeghi; Hassani, Aydin; Joo, Sang Woo

doi:10.1016/j.jtice.2019.04.051

Cited by 86 publications

(20 citation statements)

References 73 publications

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“…The LZ-sg sample appeared to have a higher intensity than that of the LZN-sg sample, which suggests that the doping of the Ni 2+ ion in La 2 Zr 2 O 7 could reduce the photogenerated electron-hole recombination rate [47]. This decrease could be attributed to the electron trapping effect of Ni, which acts as an electron acceptor that therefore hinders the recombination process [48,49]. These findings fully support the aforementioned UV-Vis spectra.…”

Section: Photoluminescence Studysupporting

confidence: 78%

Effect of Preparation Method and Ni2+ Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore

et al. 2021

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In order to establish the effective application of materials in a particular area, it is important to first investigate the physical and chemical properties, such as the crystallinity, structure, and the optical and surface properties. The objective of the present study is to fabricate thermally stable pyrochlore oxides, namely, lanthanum zirconate (La2Zr2O7, LZ) and Ni-doped lanthanum zirconate (La2Zr1.5Ni0.5O7, LZN) by the solid-state and sol-gel methods. The effects of the preparation and substitution of Zr4+ by Ni2+ for the resulting nanocrystalline samples were characterized in terms of structure, purity, porosity, the thermal and optical properties, and photoluminescence by different techniques: XRD, FT-IR, BET, EDS, TG-DTG, UV-Vis-DRS, and PL. The XRD results confirm that the pyrochlores prepared via the sol-gel method (LZ-sg and LZN-sg) had a cubic unit-cell lattice, whereas the solid-state method (LZ-s and LZN-s) had impurities of the oxides. The XRD patterns, LZ-sg and LZN-sg, were further treated with the Rietveld technique. The textural measurements reveal that LZ-sg had a higher BET surface area compared to LZN-sg. In addition, the substitution of Zr4+ by the Ni2+ ion provides rational evidence for the improvement in the oxygen mobility, as well as the optical and photoluminescence properties through the lowering of the optical band energy and the electron–hole pairs.

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Section: Photoluminescence Studysupporting

confidence: 78%

Effect of Preparation Method and Ni2+ Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore

et al. 2021

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“…The samples for the toxicity tests were prepared by the addition of an appropriate amount of the Zn-Fe LDHs into the culturing medium for each test organism. The wide concentration ranges of Zn-Fe LDHs used in this work were chosen based on related applications reported in the scientific literature [ 10 , 12 , 13 , 14 , 15 ]. Appropriate volumes specified for the toxicity tests were prepared by adding the Zn-Fe LDHs catalyst into the test medium through an automatic pipette forming catalyst + test medium suspensions.…”

Section: Methodsmentioning

confidence: 99%

“…Their high specific surface area, catalytic ability, anion exchange capability, thermal stability, tunability, as well as flexibility in their interlayer spaces [ 2 , 7 ] render them high performance and unique materials. Hence LDHs found their applications in various fields such as biology [ 1 , 6 ], electrochemistry [ 6 , 8 , 9 ], photochemistry [ 10 , 11 ], pharmacy and medicine [ 1 , 12 ]. They are also used as additives in polymers, adsorbents in water purification systems [ 13 ] and, in particular, as catalytic nanomaterials or catalyst supports [ 10 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Toxicity of Zn-Fe Layered Double Hydroxide to Different Organisms in the Aquatic Environment

et al. 2021

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The application of layered double hydroxide (LDH) nanomaterials as catalysts has attracted great interest due to their unique structural features. It also triggered the need to study their fate and behavior in the aquatic environment. In the present study, Zn-Fe nanolayered double hydroxides (Zn-Fe LDHs) were synthesized using a co-precipitation method and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and nitrogen adsorption-desorption analyses. The toxicity of the home-made Zn-Fe LDHs catalyst was examined by employing a variety of aquatic organisms from different trophic levels, namely the marine photobacterium Vibrio fischeri, the freshwater microalga Pseudokirchneriella subcapitata, the freshwater crustacean Daphnia magna, and the duckweed Spirodela polyrhiza. From the experimental results, it was evident that the acute toxicity of the catalyst depended on the exposure time and type of selected test organism. Zn-Fe LDHs toxicity was also affected by its physical state in suspension, chemical composition, as well as interaction with the bioassay test medium.

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“…S4 and the related values were tabulated in Table 1. The enhanced specific surface area is in accordance with the smaller grain size of the The catalyst recovery to treat water is of great importance due to the economic point of view [37]. Therefore, the VSM measurement was carried out to study the magnetic properties of the pure magnetite and its variation after doping or co-doping of Co, and Zn.…”

Section: Characterization Of Synthesized Nanocatalystsmentioning

confidence: 99%

Cubic cobalt and zinc co-doped magnetite nanoparticles for persulfate and hydrogen peroxide activation towards the effective photodegradation of Sulfalene

Fazli

Khataee

Brigante

et al. 2021

Chemical Engineering Journal

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In this work, the cubic cobalt and zinc doped and co-doped magnetite nanocatalysts were synthesized and characterized using different analysis. The so-synthesized photocatalysts were used for the activation of hydrogen peroxide (HP) and persulfate (PS) under UVA irradiation. The integration of Fe 2.5 Co 0.3 Zn 0.2 O 4 improved the activation of PS and HP; wherein, the UVA/Fe 2.5 Co 0.3 Zn 0.2 O 4 /PS process demonstrated higher degradation performance for Sulfalene (SFL) as a veterinary pharmaceutical contaminant in water. Afterward, the effect of different physicochemical parameters was studied and the radicals generated through the process were identified using chemical scavengers. UVA/Fe 2.5 Co 0.3 Zn 0.2 O 4 /PS process brought about 67% of SFL degradation in real wastewater. Moreover, 85% of TOC removal was achieved within 15 h of the abovementioned process. Eventually, the phototoxicity of the untreated and treated SFL solution after 120 min of the UVA/Fe 2.5 Co 0.3 Zn 0.2 O 4 /PS process was studied using Lemna minor aquatic species.

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Fabrication of ZnFe-layered double hydroxides with graphene oxide for efficient visible light photocatalytic performance

Cited by 86 publications

References 73 publications

Effect of Preparation Method and Ni2+ Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore

Effect of Preparation Method and Ni2+ Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore

Toxicity of Zn-Fe Layered Double Hydroxide to Different Organisms in the Aquatic Environment

Cubic cobalt and zinc co-doped magnetite nanoparticles for persulfate and hydrogen peroxide activation towards the effective photodegradation of Sulfalene

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