Catalytic destruction of chlorinated aromatic pollutants over mesoporous CuxMg1−xAl2O4 spinel oxides

Fan, Yun; Lu, Xianbo; Ni, Yuwen; Zhang, Haijun; Zhu, Meiwen; Li, Yun; Chen, Jiping

doi:10.1016/j.apcatb.2010.11.001

Cited by 44 publications

(23 citation statements)

References 32 publications

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“…This might be one reason why XRD patterns increased and sharpened gradually with the increase of calcination temperature. A positive trend between crystallite size and XRD peak intensity has been previously reported for the preparation of the Cu x Mg 1−x Al 2 O 4 spinel oxides and Ni-Zn ferrites [16,20]. The change was also accompanied by the appearance of additional Fe 2 O 3 (JCPDS 01-089-0596) phases.…”

Section: Resultssupporting

confidence: 71%

“…In contrast, the pure Fe 3 O 4 sample has the largest BET surface area of 59 m 2 g −1 , which might be attributed to its highest total pore volume among four iron-based spinels. Similar relationships have been found during the preparation of Co 3 O 4 and Cu x Mg 1−x Al 2 O 4 [20,27].…”

Section: Analysis Of the Pore Structuresupporting

confidence: 81%

“…3 [20]. The decrease of the activity of NiFe series samples with increasing calcination temperature could be attributed to the decrease of the surface area and pore volume of the NiFe samples [27,[31][32][33][34].…”

Section: Activity Testmentioning

confidence: 96%

“…Recently, spinel oxides are increasingly being investigated as catalysts to remove environmental pollutants. Several studies have reported that spinels as multicomponent materials exhibited high level of activities toward degradation of chlorinated aromatics [18][19][20][21]. Cesteros et al [18] found that the hydrodechlorination of 1,2,4-trichlorobenzene to benzene proceeded at a much greater rate in the presence of a spinel-supported nickel material (Ni/NiAl 2 O 4 ) than it did in the presence of an aluminum-supported nickel materials (Ni/Al 2 O 3 ) at 150-250 • C. Furthermore, Fan et al [19] reported 85% dechlorination efficiency (DE) of hexachlorobenzene (HCBz) and 99% decomposition efficiency of polychlorinated dibenzodioxin (PCDD) were achieved over CuAl 2 O 4 material at 250 • C, which was more effective than the corresponding metallic copper and copper oxide materials.…”

Section: Introductionmentioning

confidence: 99%

“…Cesteros et al [18] found that the hydrodechlorination of 1,2,4-trichlorobenzene to benzene proceeded at a much greater rate in the presence of a spinel-supported nickel material (Ni/NiAl 2 O 4 ) than it did in the presence of an aluminum-supported nickel materials (Ni/Al 2 O 3 ) at 150-250 • C. Furthermore, Fan et al [19] reported 85% dechlorination efficiency (DE) of hexachlorobenzene (HCBz) and 99% decomposition efficiency of polychlorinated dibenzodioxin (PCDD) were achieved over CuAl 2 O 4 material at 250 • C, which was more effective than the corresponding metallic copper and copper oxide materials. In the further studies, they synthesized Cu [20]. However, to the best of our knowledge, no studies have been reported in the literatures concerning the reaction activity of spinels, especially iron-based spinels, toward the decomposition of PCBs.…”

Section: Introductionmentioning

confidence: 99%

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Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Huang¹,

Su²,

Zhang³

et al. 2013

Journal of Hazardous Materials

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h i g h l i g h t s• The NiFe 2 O 4 had the highest activity in degradation of CB-209, followed by Fe 3 O 4 .• Hydroxyl species, organic acids, PCBs and chlorobenzenes were identified as products.• Three degradation reactions and one combination reaction competitively occurred.• Hydrodechlorination of CB-209 was more favored over Fe 3 O 4 than NiFe 2 O 4 .• Oxidation reaction of CB-209 was more favored over t r a c tA series of mesoporous iron-based spinel materials were synthesized to degrade polychlorinated biphenyls (PCBs), with CB-209 being used as a model compound. The materials were characterized by X-ray powder diffraction (XRD), pore structure analysis, and X-ray photoelectron spectroscopy (XPS). A comparison of the dechlorination efficiencies (DEs) of the materials revealed that NiFe 2 O 4 had the highest DE, followed by Fe 3 O 4 . Newly produced polychlorinated biphenyls, chlorinated benzenes, hydroxyl species and organic acids were detected by gas chromatography-mass spectrometry, high performance liquid chromatography-mass spectrometry and ion chromatograph. Identification of the intermediate products indicates that three degradation pathways, hydrodechlorination, the breakage of C C bridge bond and oxidative reaction, accompanied by one combination reaction, are competitively occurring over the iron-based spinels. The relative amounts of produced three NoCB isomers were illustrated by the C Cl BDEs of CB-209 at meta-, para-and ortho-positions, and their energy gap between HOMO and LUMO. The consumption of the reactive oxygen species caused by the transformation of Fe 3 O 4 into Fe 2 O 3 in the Fe 3 O 4 reaction system, and the existence of the highly reactive O 2 −• species in the NiFe 2 O 4 reaction system, could provide a reason why the oxidation reaction was more favored over NiFe 2 O 4 than Fe 3 O 4 .

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Section: Resultssupporting

confidence: 71%

Section: Analysis Of the Pore Structuresupporting

confidence: 81%

Section: Activity Testmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Huang¹,

Su²,

Zhang³

et al. 2013

Journal of Hazardous Materials

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A review on recent advances in catalytic combustion of chlorinated volatile organic compounds

Zhao

Suo

et al. 2020

J of Chemical Tech & Biotech

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Chlorinated volatile organic compounds (CVOCs) with strong stability, poor reactivity and high toxicity in waste gases are emitted into the atmosphere from many industrial operations, which has caused sustained harm to both human health and atmospheric environment. Catalytic combustion is regarded as one of the most effective methods to eliminate CVOCs due to its high removal efficiency, low energy consumption and low production of secondary pollutants. However, the screening of efficient catalysts (i.e. low cost, high activity and durability) still remains challenging. In this review, recent developments on catalytic combustion of CVOCs, including catalysts, reaction condition, catalytic reaction mechanism, deactivation reasons and regeneration methods are summarized. It is emphasized that the active components, structures and supports of catalysts have significant effects on their activity, selectivity, stability and longevity. In addition, it is pointed out that catalyst deactivation is closely related to chlorine poisoning, sintering, carbon deposition and metal active phase leaching. Compared with other catalysts, perovskite‐type composite oxides and spinel‐type composite oxides have shown to be promising materials in the catalytic combustion of CVOCs due to their particular structure and nature (e.g. surface area, redox property and surface acidity). Thereafter, the outlooks on catalytic combustion of CVOCs are also presented in this article based on the studies in the literature, which offer influential information for further research on the treatment technology of CVOCs. © 2020 Society of Chemical Industry

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Luminescence study of Dy³⁺ doped magnesium aluminate phosphors for white light

Kaur

Rani

2023

Zeitschrift anorg allge chemie

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Pure MgAl2O4 and a series of Dysprosium (Dy3+) doping in MgAl2O4 nanoparticles has synthesized using wet chemical sol‐gel method and prepared samples were sintered at 1100 °C. X‐ray diffraction analysis confirms the cubic phase of MgAl2O4 spinel without any impurity in phase even with different doping concentrations of Dy3+ (0.2–1.8 mol %). Under ultraviolet irradiation (283 nm) the fluorescence spectrum of pure MgAl2O4 shows maximum emission in the green‐yellow region. On Dy3+ doping in MgAl2O4, broad emission spectra have been observed due to energy transition that takes place between the host and dopant. To explore the nanophosphor for white light, chromaticity coordinates (CIE), color temperature (CCT), color rendering index (CRI) and color purity were analyzed and at 1.4 mol % doping concentration of Dy3+ in MgAl2O4 got best results i. e. CIE co‐ordinates (0.3326, 0.3334), CCT (5487), CRI (95) and minimum value of color purity (0.20 %). It is observed that emission shifts from yellow‐green to nearly white light emission as the doping is incorporated into the host. It is found that the prepared nanophosphors are energy efficient white light material.

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Catalytic destruction of chlorinated aromatic pollutants over mesoporous CuxMg1−xAl2O4 spinel oxides

Cited by 44 publications

References 32 publications

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

A review on recent advances in catalytic combustion of chlorinated volatile organic compounds

Luminescence study of Dy³⁺ doped magnesium aluminate phosphors for white light

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Catalytic destruction of chlorinated aromatic pollutants over mesoporous CuxMg1−xAl2O4 spinel oxides

Cited by 44 publications

References 32 publications

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

A review on recent advances in catalytic combustion of chlorinated volatile organic compounds

Luminescence study of Dy3+ doped magnesium aluminate phosphors for white light

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Product

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Luminescence study of Dy³⁺ doped magnesium aluminate phosphors for white light