LaMO 3  perovskites (M=Co, Cu, Fe and Ni) as heterogeneous catalysts for activating peroxymonosulfate in water

Lin, Kun‐Yi Andrew; Chen, Yu-Chien; Lin, Yi‐Feng

doi:10.1016/j.ces.2016.11.017

Cited by 149 publications

(34 citation statements)

References 84 publications

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“…Sulfate and hydroxyl radicals can also react with Cl − forming Cl • which can further react with chloride forming Cl 2 •− . Consequently, these radicals Cl • , Cl 2 •− are likely to contribute to the degradation of the target compound [15,52,53]. According to previous studies concerning the use of perovskite materials for SPS activation, diverse results have been reported about the effect of common inorganic anions, e.g., HCO − 3 and Cl − , on pollutant degradation.…”

Section: Water Matrix Effectmentioning

confidence: 99%

“…According to previous studies concerning the use of perovskite materials for SPS activation, diverse results have been reported about the effect of common inorganic anions, e.g., HCO − 3 and Cl − , on pollutant degradation. Lin et al [53] reported that the presence of NaCl from 250 to 1000 mg/L noticeably decreased the degradation kinetics of dyes in the presence of LaMO 3 . Comparable results were obtained using CaMnO 3 , La 0.8 Sr 0.2 CoO 3−δ and LaCoO 3 nanocomposites as persulfate activators for the removal of phenol and pharmaceutical compounds [15,36,51].…”

Section: Water Matrix Effectmentioning

confidence: 99%

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Lanthanum Nickel Oxide: An Effective Heterogeneous Activator of Sodium Persulfate for Antibiotics Elimination

et al. 2020

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In recent years, the presence of pharmaceutically active compounds (PhACs) in surface waters and wastewaters has b the effectiveness of conventional water treatment methods. Towards this direction, advanced oxidation processes (AOPs) for the complete elimination of micro pollutants in waters have become an emerging area of research. The present study reports the heterogeneous activation of sodium persulfate (SPS) by LaNiO3 (LNO) perovskite oxide for the degradation of sulfamethoxazole (SMX), an antibiotic agent. LNO was prepared according to a combustion method, and its physicochemical characteristics were identified by means of XRD, BET, TEM, and SEM/EDS. SMX degradation results showed the great efficiency of LNO for SPS activation. Increasing LNO and SPS dosage up to 250 mg/L enhanced the SMX degradation. In contrast, increasing SMX concentration resulted in longer time periods for its degradation. Considering the pH effect, SMX removal was obstructed under basic conditions, while the efficiency was enhanced at near-neutral conditions. The present system’s activity was also tested for piroxicam (PIR) and methylparaben (MeP) degradation, showing promising results. Unfortunately, experiments conducted in real water matrices such as bottled water (BW) and wastewater (WW), showed that SMX removal was limited to less than 25% in both cases. The hindering effects were mainly attributed to bicarbonate ions and organic matter present in aqueous media. The results obtained using suitable radical scavengers revealed the contribution of both hydroxyl and sulfate radicals in degradation reactions. Finally, LNO exhibited good stability under consecutive experimental runs.

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Section: Water Matrix Effectmentioning

confidence: 99%

Section: Water Matrix Effectmentioning

confidence: 99%

Lanthanum Nickel Oxide: An Effective Heterogeneous Activator of Sodium Persulfate for Antibiotics Elimination

et al. 2020

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“…In recent years, cobalt-based perovskites of formula LnCoO 3 , where Ln is a rare earth element, have attracted considerable interest due to their outstanding physical and chemical properties. These properties have found application in different areas like heterogeneous catalysis, solid oxide fuel cells, thermoelectricity, gas sensors, and photocatalysis, among others [1][2][3][4][5][6][7][8][9][10][11]. About their magnetic and electrical properties, a lot of experimental and theoretical researches have been done; however, the interpretation of the results is still under debate [12].…”

Section: Introductionmentioning

confidence: 99%

Novel UV Sensing and Photocatalytic Properties of DyCoO₃

et al. 2019

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Oxides with the perovskite type structure of formula LnCoO 3 , where Ln is a rare earth element, have unique physical and chemical properties. These materials are applied in catalysis, gas sensors, and electrodes for solid oxide fuel cells, among others. In this work, single-phase DyCoO 3 was obtained at 900 ∘ C using the solution-polymerization method. The microstructure of this material corresponds to a dendritic-type shape, with grain size between 0.2 and 8 m and abundant porosity. The ultraviolet (UV) sensing characterization was performed on sintered pellets made with the as-prepared DyCoO 3 powder. The UV source was a light emitting diode (LED) of wavelength ( ) of 365 nm. The detection of this radiation, with constant optical irradiance (E e ), produced uniform and reproducible response patterns. When E e was increased, the graphs revealed a quantitative detection of the light. Analogous results were obtained using light of larger wavelengths: = 400, 449, and 642 nm. The graphs display a decrease on the variation of the photocurrent by increasing , corresponding to a decrease on the energy of the incoming photons. On the other hand, the photocatalytic decomposition of malachite green under UV radiation was investigated using powder of DyCoO 3 . The results show a decrease of the absorbance by increasing the UV exposure time, indicating the degradation of the dye. Since DyCoO 3 is a p-type semiconductor material, the generation of electrical charge carriers under UV radiation explains its photocurrent and photocatalytic properties. In general, these properties can be applied in UV sensors to prevent skin cancer, photoconductive materials for solar photocells, and photocatalysis to decompose organic dyes.

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“…Special attention is given to perovskites that worked in the dark, as this group of materials are preferred with respect to economic saving and feasible operation. For instance, LaCoO3 has been widely studied for the degradation of RhB [76,77], RB-5 [78] and MO [79] dyes via photocatalysis, ozonation, or sulphase radical based AOPs. Notably, Ca, Mg and Ba can substitute A-site La to result in substituted perovskites that showed catalytic activity for other dyes (e.g., CR [80], X-3B [81] and MG [82], respectively).…”

Section: Perovskite Catalystsmentioning

confidence: 99%

“…Intensive effort has been devoted to explore high catalytically active Cu-containing perovskites for water remediation [77,94,95]. The presence of copper in the perovskite catalysts enhanced the photocatalytic degradation ability by forming synergistic effect between Cu and other components in the compounds [96,97].…”

Section: Perovskite Catalystsmentioning

confidence: 99%

Perovskite catalysts for Advanced Oxidation Processes (AOPs) in wastewater treatment

Chen¹

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Advanced oxidation processes (AOPs) are desirable to treat industrial wastewaters containing dyes, mainly attributed to degradation by in-situ generated highly oxidizing hydroxyl radicals (HO•). However, current AOPs generally require chemical additives or energy that hinder their economic competitiveness. Metal oxides following a general formula ABO, including perovskites, have been applied as heterogeneous catalyst for dye degradation under dark ambient conditions without additional chemical/energy input. Nevertheless, significant research gaps still exist associated with the sluggish degradation kinetics and structural stability of catalysts in addition to a limited number of metal oxides reported to date as catalysts under dark ambient conditions.There is an array of metal oxides that can be used as catalysts for dye degradation under dark conditions which remain unexplored. The research gaps in this theme include oxides of copper, nickel and cobalt as B-site cation, whilst alkaline earth metals (Sr, Ca and Mg) in addition to lanthanide elements (Ce and La) could be incorporate into the A-site, similar to perovskites.These metal oxides can be formulated into binary (ABO), ternary (AA'BO or ABB'O) or quaternary (AA'BB'O) compounds. This thesis therefore aims to understand the fundamental correlation of physicochemical properties and catalytic performance of these metal oxide compounds. It was hypothesized that the partial substitution of A' or B' in ABO3 confers tuneable catalytic properties to enhance the degradation performance for Orange II (OII), which is a major water pollutant from dye-related industries.The first key contribution of this thesis is the successful preparation of CuO based catalysts (AA'BO) as CaSrCuO (CSC) formed both metal oxide and perovskite phases. The varied Ca content resulted in materials with different phases and CSC with high Ca content was very effective, reaching 80% of OII (20 mg L -1 ) degradation in 10 min with 60% TOC removal after 120 min. CSC proved to be stable and maintained high performance up to nine cycles (75%).CSC was very active in breaking down azo bonds of OII, thus generating electrons which reacted with dissolved O2 in the solutions to yield reactive species (e.g., HO•) for further degradation and mineralization.The second contribution of this thesis is the replacement of Cu by Ni (again AA'BO) as CaSrNiO (CSN), which formed a very active Ni 2+ phase in the CSN metal oxide. It was found that 97% OII was discoloured within 5min though TOC removal was low (~10%). The fast P a g e | ii degradation was aided by electron donation from Ni 2+ to O2, resulting in the formation of Ni 3+ and reactive species (e.g., HO•). The Ni 3+ proved to be catalytically inactive for OII degradation under dark ambient conditions, and the catalytic performance of CSN decayed rapidly under cycling testing.The third contribution of this work was born out from a desire to stabilise the very active NiO.Therefore, the research approach was to partially substitute Ni in CSN with Cu as AA'BB...

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LaMO 3 perovskites (M=Co, Cu, Fe and Ni) as heterogeneous catalysts for activating peroxymonosulfate in water

Cited by 149 publications

References 84 publications

Lanthanum Nickel Oxide: An Effective Heterogeneous Activator of Sodium Persulfate for Antibiotics Elimination

Lanthanum Nickel Oxide: An Effective Heterogeneous Activator of Sodium Persulfate for Antibiotics Elimination

Novel UV Sensing and Photocatalytic Properties of DyCoO₃

Perovskite catalysts for Advanced Oxidation Processes (AOPs) in wastewater treatment

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LaMO 3 perovskites (M=Co, Cu, Fe and Ni) as heterogeneous catalysts for activating peroxymonosulfate in water

Cited by 149 publications

References 84 publications

Lanthanum Nickel Oxide: An Effective Heterogeneous Activator of Sodium Persulfate for Antibiotics Elimination

Lanthanum Nickel Oxide: An Effective Heterogeneous Activator of Sodium Persulfate for Antibiotics Elimination

Novel UV Sensing and Photocatalytic Properties of DyCoO3

Perovskite catalysts for Advanced Oxidation Processes (AOPs) in wastewater treatment

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Product

Resources

About

Novel UV Sensing and Photocatalytic Properties of DyCoO₃