The variation of cationic microstructure in Mn-doped spinel ferrite during calcination and its effect on formaldehyde catalytic oxidation

Liang, Xiaoliang; Liu, Peng; He, Hongping; Wei, Gaoling; Chen, Tianhu; Tan, Wei; Tan, Fuding

doi:10.1016/j.jhazmat.2015.12.035

Cited by 41 publications

(15 citation statements)

References 43 publications

(47 reference statements)

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“…Furthermore, the lactic acid can also be decomposed into H 2 , acetate, and propionate by the soil indigenous microorganisms, and the H 2 that is produced can act as an electron donor for the dehalogenation of the halogenated pollutants. For example, lactic acid has been reported to stimulate dechlorinating microorganisms, and lactic acid might have stimulated the reductive dechlorination of pentachlorophenol in paddy soils 4 . The debromination of TBBPA in the sediments was significantly stimulated by the pyruvate, ethanol, and acetate +H 2 , which might be utilized as electron donors and carbon sources for the microorganisms 37 .…”

Section: Discussionmentioning

confidence: 99%

“…Utilized as the carbon and energy source for the microorganisms 20 , the soil organic carbon may have a significant effect on the activities of microbes and consequently affect the biodegradation of halogenated pollutants. Low-molecular-weight organic acids added as exogenous carbon sources have been shown to stimulate the anoxic dechlorination of pentachlorophenol and DDT in soils 4 , 18 , 21 . However, the influence of low molecular weight organic acids (e.g., lactic acid) introduced by agronomic practices, such as fertilization, on the degradation of TBBPA in soils is still unclear and needs to be investigated further.…”

Section: Introductionmentioning

confidence: 99%

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Degradation of tetrabromobisphenol A in a paddy soil during sequential anoxic-oxic incubation: Kinetics, metabolites, and potential pathways

Wei

Zhao

Huang

et al. 2018

Sci Rep

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Due to the increasing pollution of tetrabromobisphenol A (TBBPA) in paddy soils, it is of great importance to explore the degradation of TBBPA under repeated anoxic-oxic conditions. In the present study, the degradation of TBBPA (kinetics, metabolites and potential pathways) and the influence of low molecular weight organic acid i.e., lactic acid were investigated in a paddy soil during sequential anoxic-oxic incubations. Under the anoxic condition, TBBPA in the non-sterile soils was efficiently debrominated into three intermediates (including tri-BBPA, di-BBPA and mono-BBPA) and bisphenol A (BPA) with a rate constant (k) of 0.0371 d−1 and a half-life (t1/2) of 60.8 d. The debromination end product (BPA) steadily accumulated. Next, turning to the oxic conditions, the anaerobically accumulated BPA degraded rapidly, while the intermediates and TBBPA were desorbed from the bound residues and were persistent. The detection of tri-BBPA followed by di-BBPA and mono-BBPA thereafter indicated that the dehalogenation of TBBPA was likely a stepwise removal of bromine atoms. A pathway of TBBPA → tri-BBPA → di-BBPA → mono-BBPA → BPA was thus proposed for TBBPA degradation. The degradation of TBBPA and its metabolites was biologically mediated. Moreover, the biodegradation of TBBPA could be significantly accelerated by the addition of lactic acid as an exogenous carbon source and electron donor, with k being increased to 0.0766 d−1 and t1/2 being shortened to 31.9 d. The information will improve our understanding of biotic process associated with agronomic practices (such as applying organic fertilizers) contributing to TBBPA attenuation in the natural soil environment.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Degradation of tetrabromobisphenol A in a paddy soil during sequential anoxic-oxic incubation: Kinetics, metabolites, and potential pathways

Wei

Zhao

Huang

et al. 2018

Sci Rep

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“…The Mn 2p 3/2 XPS spectra in Fig. (b) could be fitted for two peaks using a peak‐fitting deconvolution method, and the BE at 641.8–641.9 eV and 643.8–644.0 eV could be assigned to surface Mn 3+ and Mn 4+ species, respectively . As presented in Table , those Mn‐Ni composite oxides had higher values of surface Mn 4+ /Mn 3+ than MnO x ; in other words, the population of higher Mn oxidation states (Mn 4+ ) in Mn‐Ni composite oxides increased with the incorporation of Ni.…”

Section: Resultsmentioning

confidence: 97%

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Guo

Zhi

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Benzene (C6H6) is a typical kind of volatile organic compound (VOC) which can exert great harm to both human health and the environment, and, thus, which needs to be eliminated before its emission. In this work, porous manganese–nickel (Mn‐Ni) composite oxide catalysts were synthesized through the oxalate route and applied to thermal catalytic oxidation of C6H6. By means of activity tests and relative physico‐chemical characterizations, the factors affecting the activity of those Mn‐Ni composite oxides were explored. RESULTS Nitrogen (N2)‐adsorption/desorption and X‐ray photoelectron spectroscopy (XPS) measurements indicated that the Brunauer–Elmett–Teller (BET) surface area and the content of surface‐adsorbed oxygen species were increased due to the addition of Ni into Mn oxide (MnOx). Meanwhile, the oxygen mobility and reducibility also were improved in the Mn‐Ni composite oxides. Accordingly, compared with MnOx, the Mn‐Ni catalysts showed higher activity for thermal catalytic oxidation of C6H6. Moreover, porous Mn‐Ni composite oxides with a Mn:Ni molar ratio of 4:1 (Mn4Ni1) displayed the best catalytic activity. Further investigation indicated that the excellent catalytic performance of Mn4Ni1 composite oxides could be ascribed mainly to the larger BET surface area and the richer content of surface‐adsorbed oxygen species, as well as stronger oxygen mobility and better reducibility compared with other Mn‐Ni catalysts. CONCLUSIONS The Mn4Ni1 composite oxides showed a lowest T90 value of 172 °C (C6H6 concentration 200 ppm, WHSV 60 000 mL g−1 h−1) among all of the obtained Mn‐Ni composite oxides. Moreover, it also exhibited favourable catalytic stability at 210 °C in the presence or absence of moisture. © 2019 Society of Chemical Industry

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“…[93] The O1s peak is deconvoluted into two contributions at 530 and 531 eV, that are attributed to the crystal lattice oxygen and surface-adsorbed oxygen, respectively ( Figure 4.17f). [94]…”

Section: Part IIImentioning

confidence: 99%

Biomedical Applications of Magnetic Nanoparticles

Varadan¹,

Chen²,

Xie³

2008

Nanomedicine

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The thesis focuses on the specific design of multifunctional magnetic nano-carriers for different biomedical areas. Different shapes of core/shell bi-magnetic nanoparticle have been synthesized by seedmediated growth, and their structural and magnetic properties have been studied. The experimental results showed that core/shell nanoparticles have a higher specific absorption rate compared to the core ones. For drug delivery application, the surface of the magnetic nanoparticles is functionalized using different techniques (Diels-Alder reaction and layer-by-layer technique). More precisely, a novel bi-functional thermo-responsive system, which consists of core/shell bi-magnetic nanoparticles with furan surface functionality, is bonded with N-(2-Carboxyethyl)maleimide through Diels-Alder reaction. The chemotherapeutics doxorubicin is attached onto the surface of the nanocarriers, and a high loading efficiency of 92% is obtained. This system with high responsiveness to a high frequency external alternating magnetic field shows a very good therapeutic efficiency in hyperthermia and drug release at relatively low temperatures (50 °C). On the other hand, a switch-controlled drug release is realized by coating the core/shell bi-magnetic nanoparticle with a pH-and thermo-responsive polymer shell. Doxorubicin is loaded onto the surface of the last coating layer, and a high loading efficiency is obtained. The nano-carriers are characterized with FTIR, dynamic light scattering, Zeta potential, In vitro hyperthermia, and vibrating sample magnetometry. The in vitro drug release experiments confirm that a small amount of doxorubicin is released at body temperature and physiological pH, whereas a high drug release is obtained at acidic tumor pH under hyperthermia conditions (43 °C). The core/shell bi-magnetic nano-carriers facilitate controllable release of doxorubicin as effect of induced thermo-and pHresponsiveness of the polymer when are subjected to an high-frequency alternating magnetic field at acidic pH; thereby the drug release rate is controlled using on-off cycles of the applied field. iii KURZFASSUNG Diese Arbeit befasst sich mit der speziellen Gestaltung von multifunktionalen magnetischen Nanopartikeln für diverse biomedizinische Anwendungen. Verschiedene Formen der Kern/Schale-bimagnetischen Nanopartikel wurden durch die "seed-mediated growth" Methode synthetisiert, und die strukturellen und magnetischen Eigenschaften dieser Formen untersucht. Die Versuchsergebnisse haben gezeigt, dass die Kern/Schale-Nanopartikel eine höhere spezifische Energiea als reine Kern Partikel haben. Für die Drug Delivery Anwendung wird die Oberfläche der magnetischen Nanopartikel auf unterschiedlichen Wege (Diels-Alder-Reaktion und Layer-by-Layer-Verfahren) funktionalisiert. Dazu wurde an ein neuartiges bifunktionelles thermosensitives System, welches aus furanbeschichteten Kern/Schale bi-magnetischen Nanopartikel besteht, N-(2-Carboxyethyl) maleimid durch Diels-Alder Reaktion angebunden. Mit der Anbindung des chemotherapeutischen Doxoru...

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The variation of cationic microstructure in Mn-doped spinel ferrite during calcination and its effect on formaldehyde catalytic oxidation

Cited by 41 publications

References 43 publications

Degradation of tetrabromobisphenol A in a paddy soil during sequential anoxic-oxic incubation: Kinetics, metabolites, and potential pathways

Degradation of tetrabromobisphenol A in a paddy soil during sequential anoxic-oxic incubation: Kinetics, metabolites, and potential pathways

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Biomedical Applications of Magnetic Nanoparticles

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