Decomposing phenol by the hidden talent of ferromagnetic nanoparticles

Zhang, Jinbin; Zhuang, Jie; Gao, Lizeng; Zhang, Yu; Gu, Ning; Feng, Jing; Yang, Di; Jin-hua, Zhu; Yan, Xiyun

doi:10.1016/j.chemosphere.2008.05.050

Cited by 218 publications

(123 citation statements)

References 20 publications

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“…Before that, several attempts studying the potential application of magnetite and other natural minerals as catalysts in Fenton oxidation were carried out [36][37][38][39][40]. However, the first work published devoted uniquely to magnetite as CWPO catalyst is that reported by Zhang et al (2008) [41], who studied the degradation of phenol by Fenton oxidation using ferromagnetic nanoparticles (MNPs). These authors claimed that MNPs represent a promising alternative to the conventional catalysts used in CWPO due to their higher activity as well as their easy recovery and further reusability.…”

Section: Application Of Magnetic Materials As Catalysts In Heterogenementioning

confidence: 99%

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Preparation of magnetite-based catalysts and their application in heterogeneous Fenton oxidation – A review

Muñoz

Pedro

Casas

et al. 2015

Applied Catalysis B: Environmental

664

274

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Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: AbstractThis study presents a critical review on the application of magnetite-based catalysts to industrial wastewater decontamination by heterogeneous Fenton oxidation. The use of magnetic materials in this field started only around 2008 and continues growing increasingly year by year. The potential of these materials derives from their higher ability for degradation of recalcitrant pollutants compared to the conventional iron-supported catalysts due to the presence of both Fe(II) and Fe(III) species. In addition, their magnetic properties allow their easy, fast and inexpensive separation from the reaction medium. The magnetic materials applied up to now can be classified in three general groups: magnetic natural minerals, in-situ-produced magnetic materials and ferromagnetic nanoparticles. A survey of the catalysts investigated so far is presented paying attention to their nature and competitive features in terms of activity and durability.2

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Section: Application Of Magnetic Materials As Catalysts In Heterogenementioning

confidence: 99%

“…The synthesis of MNPs can be carried out by different methods such as co-precipitation [41,84], microemulsion [85], hydrothermal [86,87] or sonochemical synthesis [88], among other [83].…”

Section: Ferromagnetic Nanoparticlesmentioning

confidence: 99%

Preparation of magnetite-based catalysts and their application in heterogeneous Fenton oxidation – A review

Muñoz

Pedro

Casas

et al. 2015

Applied Catalysis B: Environmental

664

274

View full text Add to dashboard Cite

show abstract

“…[22][23][24][25][26][27] while some work assumed that the reactions proceeded through a heterogeneous route. [28][29][30][31][32][33] Approaches that have been used to ascertain the presence of heterogeneous catalytic routes have included: (i) re-using filtered solutions and checking for organic degradation; 17,21,34 (ii) buffering solutions at alkaline/near-neutral pH to prevent metal ions leaching; 19, 20 (iii) comparing organic degradation kinetics in homogeneous and heterogeneous catalytic systems; 35 and (iv)…”

Section: Introductionmentioning

confidence: 99%

Fenton-Like Oxidation of 4-Chlorophenol: Homogeneous or Heterogeneous?

Kuan

Chang

Schroeder

2015

Ind. Eng. Chem. Res.

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Heterogeneous Fenton-like catalysts have received considerable research attention because they could potentially be attractive for oxidative removal of organic contaminants from tertiary wastewater.However, process design is still hampered by insufficient understanding of the chemical pathways involved, and especially whether oxidation activity stems from heterogeneous surface chemistry or minute concentrations of dissolved metal ions in the homogeneous phase. Using inductively coupled plasma-optical emission spectroscopy (ICP-OES) in combination with pH monitoring and ultravioletvisible spectroscopy (UV-Vis) we have monitored the degradation of 4-chlorophenol (4-CP) over two Fenton-like heterogeneous systems, namely FeOx supported on TiO2 and CuFe2O4. We show conclusively that these systems proceed predominantly through a homogeneous route via dissolved metal ions from the solid phase catalysts. Control experiments with homogeneous Fe 3+ or Cu 2+ systems reveal that even minute concentrations ( M/sub-ppm) of dissolved metal ions leached from the solid phases account for the observed 4-CP degradation rates in the heterogeneous systems. ICP-OES revealed that metal leaching was time-dependent and variable because of pH variations associated with changing acid release rates. Buffering solutions at pH 7.4 suppressed metal leaching (and hence 4-CP degradation) in the FeOx/TiO2 system, but not in others. For example, pH buffering did not entirely suppress metal leaching from CuFe2O4, for which 4-CP degradation was retained through small concentrations of Fe and Cu ions in solution. Our results highlight the importance of careful monitoring of metal content in the aqueous phase, certainly with analytical sensitivity below ppm concentrations of the dissolved metals, and also the crucial influence of time-dependent pH variations on the reaction process. Recyclability of catalysts, pH buffering of solutions or monitoring of metal content in the solid phase by less sensitive analytical methods, e.g., chemical analysis, gravimetry, X-ray fluorescence, or energy dispersive X-ray analysis in electron microscopes, cannot exclude the homogeneous Fenton route in the presence of solid catalysts. 2Keywords CuFe2O4, leaching, homogeneous, heterogeneous, catalysis IntroductionFenton's reaction is an efficient way for treating organic contaminants, e.g. for soil remediation, 1 oil spill clean-up, 2 and industrial wastewater treatment. 3 Through the addition of Fe 2+ , H2O2 and acid to wastewater streams OH radicals ( • OH) can be generated through the oxidation of Fe 2+ (Fenton's reaction, eq. 1).• OH is the active species that degrades organic contaminants. Fenton's reaction proceeds optimally around pH 3, thus wastewater streams need to be acidified. 5 Subsequent neutralisation leads to Fe(OH)3 precipitates as a sludge, requiring an additional separation step. 6 This complexity of the homogeneous Fenton route motivated investigations of heterogeneous Fenton-like systems, seeking to localise the Fenton process at the su...

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“…Interestingly, it was recently found that Fe 3 O 4 MNPs possess intrinsic HRPlike catalytic activity toward the reduction of H 2 O 2 [16]. This "artificial enzyme" is highly robust, offering unprecedented advantages in constructing peroxidase-like-based bioassays and phenol decomposition [17,18]. Carbon nanotubes are a highly popular nanomaterial because of their unique mechanical, electronic, and catalytic properties [19 22].…”

Section: Introductionmentioning

confidence: 99%

Design of a carbon nanotube/magnetic nanoparticle-based peroxidase-like nanocomplex and its application for highly efficient catalytic oxidation of phenols

et al. 2009

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We report a novel nanotechnology-based approach for the highly efficient catalytic oxidation of phenols and their removal from wastewater. We use a nanocomplex made of multi-walled carbon nanotubes (MWNTs) and magnetic nanoparticles (MNPs). This nanocomplex retains the magnetic properties of individual MNPs and can be effectively separated under an external magnetic fi eld. More importantly, the formation of the nanocomplex enhances the intrinsic peroxidase-like activity of the MNPs that can catalyze the reduction of hydrogen peroxide (H 2 O 2 ). Significantly, in the presence of H 2 O 2 , this nanocomplex catalyzes the oxidation of phenols with high effi ciency, generating insoluble polyaromatic products that can be readily separated from water.

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Decomposing phenol by the hidden talent of ferromagnetic nanoparticles

Cited by 218 publications

References 20 publications

Preparation of magnetite-based catalysts and their application in heterogeneous Fenton oxidation – A review

Preparation of magnetite-based catalysts and their application in heterogeneous Fenton oxidation – A review

Fenton-Like Oxidation of 4-Chlorophenol: Homogeneous or Heterogeneous?

Design of a carbon nanotube/magnetic nanoparticle-based peroxidase-like nanocomplex and its application for highly efficient catalytic oxidation of phenols

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