Visible light assisted Fenton-like degradation of Orange II on Ni 3 Fe/Fe 3 O 4 magnetic catalyst prepared from spent FeNi layered double hydroxide

Laipan, Minwang; Zhu, Jianxi; He, Hongping

doi:10.1016/j.molcata.2016.01.022

Cited by 43 publications

(8 citation statements)

References 35 publications

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“…Layered double hydroxides containing iron cations in their intralayer composition have received considerable attention in the field of catalysts for electrochemical water splitting, , magnetic materials, − photon Fenton reaction, and adsorbents since their physical and chemical properties can be tuned by the interlayer species and also by the content and ratio of metal cations’. Besides, iron is an earth-abundant and endogenous element, which amplifies its sphere of applications and justifies efforts to develop iron-based materials.…”

Section: Introductionmentioning

confidence: 99%

Iron-Based Layered Double Hydroxide Implants: Potential Drug Delivery Carriers with Tissue Biointegration Promotion and Blood Microcirculation Preservation

et al. 2018

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This work explores the synthesis, physicochemical characterization, and in vivo biocompatibility of ironbased layered double hydroxides (LDHs) with molar ratio M 2+ /(Fe 3+ + Al 3+ ) equal to 2, Fe 3+ /Al 3+ equal to 1, and chloride anions as charge-compensating ion (abbreviated Mg 4 FeAl-Cl and Zn 4 FeAl-Cl) prepared by the coprecipitation method. The higher structural organization of Zn 4 FeAl-Cl in comparison to Mg 2+ analogous material was noticed by X-ray diffraction and scanning electron microscopy images. Biocompatibility of LDH was evaluated by intramuscular implantation in rats. Tablets of M 4 FeAl-Cl (M = Mg, Zn) were readily identified macroscopically after 7 and 28 days of implantation, denoting slow dissolution in the internal medium; adjacent to the tablets, blood flow was preserved without tortuosity or pathological dilatations, according to the Sidestream Dark Field Imaging technique. The histological analysis showed no inflammatory response and the presence of angiogenesis and tissue remodeling with the reconstruction of the extracellular matrix and cells around the tablets, besides the induction of collagen type-I formation. Prussian blue histochemical reaction suggested higher solubility of Mg 4 FeAl-Cl in the extracellular matrix compared to zinc LDH. Considering the positive biocompatibility results obtained for M 4 II FeAl-LDH materials, experiments were conducted to intercalate the anti-inflammatory naproxen, as a model drug, into the iron-based LDHs (M 4 II FeAl-NAP). The release profile of NAP in phosphate buffer showed 90% of the drug delivered after about 80 h. However, divalent metal leaching was verified mainly for Mg-LDH (around 50%) when compared to Zn 2+ (around 1%). Iron-based LDHs have great potential for medical and technological applications as local drug delivery biomaterials exhibiting biocompatibility and biointegration properties.

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Section: Introductionmentioning

confidence: 99%

Iron-Based Layered Double Hydroxide Implants: Potential Drug Delivery Carriers with Tissue Biointegration Promotion and Blood Microcirculation Preservation

et al. 2018

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“…These studies indicate that the spent LDHs can be converted to functional materials. Our preliminary results also showed that the spent LDH with regular metal compositions (e.g., Mg and Al) could be used as a superior pore-forming template for preparing curled sheet-like porous carbon material 10 , and spent LDH with transition metal (e.g., Fe and Ni) compositions could be utilized to synthesize magnetic catalysts 11 . In the preliminary study, one interesting phenomenon was observed, being that some of the high valence metal ions (Fe 3+ and Ni 2+ ) were reduced to lower valence by the adsorbed organic contaminants under a pyrolysis procedure; but due to the limited amount of adsorbed organic contaminants, the reduction was only partially achieved.…”

Section: Introductionmentioning

confidence: 66%

Converting Spent Cu/Fe Layered Double Hydroxide into Cr(VI) Reductant and Porous Carbon Material

Laipan

Zhu

et al. 2017

Sci Rep

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Recycling solid waste as functional materials is important for both environmental remediation and resource recycling. This study attempts to recycle spent Cu/Fe layered double hydroxide (Cu/Fe-LDH) which is generated from the adsorption of dyes by converting to Cr(VI) reductant and porous carbon material. Results showed that the obtained reductant was mainly composed of Fe0 and Cu0, and exhibited good reductive activity toward Cr(VI). The species of Fe0, Fe2+, Cu0, and Cu+ all favored the reduction of Cr(VI) according to X-ray photoelectron spectroscopy analysis. During Cr(VI) removal, solution pH could increase to neutral which caused the metal ions to precipitate near completion. On the other hand, the spent Cu/Fe-LDH could be employed to produce porous carbon materials, and the generated waste metals solution herein could be reused for LDH synthesis. Specific surface areas of the obtained carbon materials varied from 141.3–744.2 m2/g with changes in adsorbed amount of dyes on the LDH. This study illustrates that all the components of wastes can be useful resources, offering a simple recycling approach for similar organic-inorganic solid wastes. This work also enlightens us that designing a proper initial product is crucial to make waste recycling simpler.

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“…Moreover, the photocatalytic Cr(VI) removal kinetics of the Cu-HyS-urea and Cu-HyS-NaOH were fitted using the pseudo-first-order kinetic model, which was generally utilized to analyze the kinetics of the photocatalytic degradation [48], as shown in Figure 6c. The reaction rate constants (k) of photolysis, Cu-HyS-NaOH (dark), Cu-HyS-urea (dark), Cu-HyS-NaOH (light), and Cu-HyS-urea (light) are 0.00005 min −1 (R 2 = 0.93), 0.013 min −1 (R 2 = 0.93), 0.00011 min −1 (R 2 = 0.92), 0.028 min −1 (R 2 = 0.90), and 0.007 min −1 (R 2 = 0.99), respectively.…”

Section: Hexavalent Chromium (Cr(vi) Removalmentioning

confidence: 99%

Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

et al. 2022

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Cu-HyS-urea and Cu-HyS-NaOH, which are hydrotalcite-like copper hydroxyl salts, were prepared by two different methods, urea hydrolysis and precipitation, respectively. Both synthesis methods provided the successful formation of a copper hydroxyl salt, Cu2(OH)3NO3. From XRD and UV-DRS results, the product from the urea hydrolysis methods (Cu-HyS-urea) displayed higher crystallinity, small bandgap energy (Eg), and high light absorption ability because of some intercalated carbonate anions. For the Cr(VI) removal test, the Cu-HyS-NaOH showed superior adsorption of Cr(VI) than Cu-HyS-urea due to a higher specific surface area, confirmed by BET analysis. However, the Cu-HyS-urea presented higher photocatalytic Cr(VI) reduction under light irradiation than Cu-HyS-NaOH, owing to narrow Eg, less recombination, and a high transfer of the photogenerated charge carriers, proven by the results from photoluminescence, photocurrent density, and electrochemical impedance spectroscopy. Thus, this work provides a new function of the hydrotalcite-like copper hydroxyl salts (Cu-HyS-urea and Cu-HyS-NaOH) that can be utilized not only for adsorption of Cr(VI) but also as photocatalysts for Cr(VI) reduction under light irradiation.

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Visible light assisted Fenton-like degradation of Orange II on Ni 3 Fe/Fe 3 O 4 magnetic catalyst prepared from spent FeNi layered double hydroxide

Cited by 43 publications

References 35 publications

Iron-Based Layered Double Hydroxide Implants: Potential Drug Delivery Carriers with Tissue Biointegration Promotion and Blood Microcirculation Preservation

Iron-Based Layered Double Hydroxide Implants: Potential Drug Delivery Carriers with Tissue Biointegration Promotion and Blood Microcirculation Preservation

Converting Spent Cu/Fe Layered Double Hydroxide into Cr(VI) Reductant and Porous Carbon Material

Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

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