Decomposing phenol by the hidden talent of ferromagnetic nanoparticles

National Laboratory of Biomacromolecules and Chinese Academy of Sciences, University of Tokyo Joint Laboratory of Structural Virology and Immunology, Institute of Biophysics, Chinese Academy of Sciences, Mailbox 1, 15 Datun Road, Beijing 100101, China.
Chemosphere (Impact Factor: 3.34). 10/2008; 73(9):1524-8. DOI: 10.1016/j.chemosphere.2008.05.050
Source: PubMed


Researches on modified Fenton reactions applied in phenol degradation have been focused on reducing secondary pollution and enhancing catalytic efficiency. Newly developed methods utilizing carriers, such as Resin and Nafion, to immobilize Fe(2+) could avoid iron ion leakage. However, the requirement of high temperature and the limited reaction efficiency still restrained them from broad application. Based on a recently discovered "hidden talent" of ferromagnetic nanoparticles (MNPs), we established a MNP-catalyzed phenol removal assay, which could overcome these limitations. Our results showed that the MNPs removed over 85% phenol from aqueous solution within 3h even at 16 °C. The catalytic condition was extensively optimized among a range of pH, temperature as well as initial concentration of phenol and H(2)O(2). TOC and GC/MS analysis revealed that about 30% phenol was mineralized while the rest became small molecular organic acids. Moreover the MNPs were thermo-stable and could be regenerated for at least five rounds. Thus, our findings open up a wide spectrum of environmental friendly applications of MNPs showing several attractive features, such as easy preparation, low cost, thermo-stability and reusability.

Download full-text


Available from: Xiaodong Yan, May 04, 2015
  • Source
    • "It is also proven to be feasible in treating industrial effluents (Ayoub et al., 2011). There are four major types of AOPs e photo catalytic oxidation (which requires a photo active catalyst and UV light), UV/H 2 O 2 , UV/ozone oxidation and Fenton oxidation (Zhang et al., 2008), all of which are covered in this Table 1 Typical characteristic of different types of recalcitrant wastewater "
    [Show abstract] [Hide abstract]
    ABSTRACT: Treatment of industrial waste water (e.g. textile waste water, phenol waste water, pharmaceutical etc) faces limitation in conventional treatment procedures. Advanced oxidation processes (AOPs) do not suffer from the limits of conventional treatment processes and consequently degrade toxic pollutants more efficiently. Complexity is faced in eradicating the restrictions of AOPs such as sludge formation, toxic intermediates formation and high requirement for oxidants. Increased mass-transfer in AOPs is an alternate solution to this problem. AOPs combined with Fluidized bed reactor (FBR) can be a potential choice compared to fixed bed or moving bed reactor, as AOP catalysts life-span last for only maximum of 5e10 cycles. Hence, FBR-AOPs require lesser operational and maintenance cost by reducing material resources. The time required for AOP can be minimized using FBR and also treatable working volume can be increased. FBR-AOP can process from 1 to 10 L of volume which is 10 times more than simple batch reaction. The mass transfer is higher thus the reaction time is lesser. For having increased mass transfer sludge production can be successfully avoided. The review study suggests that, optimum particle size, catalyst to reactor volume ratio, catalyst diameter and liquid or gas velocity is required for efficient FBRAOP systems. However, FBR-AOPs are still under lab-scale investigation and for industrial application cost study is needed. Cost of FBR-AOPs highly depends on energy density needed and the mechanism of degradation of the pollutant. The cost of waste water treatment containing azo dyes was found to be US$ 50 to US$ 500 per 1000 gallons where, the cost for treating phenol water was US$ 50 to US$ 800 per 1000 gallons. The analysis for FBR-AOP costs has been found to depend on the targeted pollutant, degradation mechanism (zero order, 1st order and 2nd order) and energy consumptions by the AOPs.
    Journal of Environmental Management 09/2014; 146(2014):260-275. DOI:10.1016/j.jenvman.2014.07.032 · 2.72 Impact Factor
    • "no iron sludge is generated and easy separation of the catalyst from the treated stream (Bautista et al. 2008; Garrido-Ramirez et al. 2010). Various heterogeneous Fenton-like catalysts such as Fe 2 O 3 (Feng et al. 2004), S-doped Fe 2 O 3 (Guo et al. 2010) and Fe 3 O 4 (Zhang et al. 2008) were used for wastewater treatment. Unfortunately, a lot of these catalysts do not exhibit favorable catalytic activity at neutral pH and the working pH values are usually around 3. Therefore, acidifying the wastewater or inputting external energy into the reaction system is a frequently used method to enhance their activity (Muthukumari et al. 2009; Cruz-González et al. 2010; Li et al. 2010). "
    [Show abstract] [Hide abstract]
    ABSTRACT: Steel industry wastes (iron-containing waste) could be used as a Fenton-catalyst for the decolorization of methyl orange dye. Various reaction conditions were investigated including catalyst concentration, hydrogen peroxide concentration and pH value. The obtained results indicated that the dye degradation rate increases with increasing catalyst and hydrogen peroxide (H2O2) concentrations and with decreasing pH value. Over 98 % decolorization of the dye was achieved within 30 min at optimum reaction conditions; 200 mg/L catalyst and 34 mM H2O2 concentrations at pH 2 for 20 mg/L initial dye concentration. Reaction kinetics was also carried out to determine the order of reaction in both catalyst and H2O2 concentrations. Stability and reusability of Iron-containing waste were investigated. The iron-containing waste as catalyst can be reused several times with nearly same efficiency of Fenton-like oxidation of MO.
    01/2013; 3(1). DOI:10.1007/s13201-013-0078-1
  • Source
    • "However , it is well known that the homogeneous Fenton process has many disadvantages, such as the requirement of further treatments for the iron ions and sludge, the acidification of effluents before decontamination, and the neutralization of treated solutions before disposal [3] [4] [5]. Heterogeneous Fenton-like systems using iron supported catalysts , e.g., zero valent iron (Fe 0 ) [6] [7], goethite (␣-FeOOH) [8] [9], Fe 3 O 4 [1] [10] [11] and Fe 0 /Fe 3 O 4 [12], have recently been developed. Many of these systems are slow and need additional assistants such as UV or visible light irradiation and ultrasound that increase the cost of equipment and operation [13] [14] [15] [16]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The removal of biocide 4-chloro-3-methyl phenol (CMP) was investigated by heterogeneous Fenton-like system using nanoparticulate zero-valent iron (nZVI) as catalyst. The properties of nZVI before and after reaction were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of pH value, initial concentration of CMP, nZVI dose and hydrogen peroxide (H(2)O(2)) concentration were determined. The experimental results showed that lower pH value and CMP concentration brought faster degradation rate. With the initial pH value of 6.1 and initial CMP concentration of 0.7 mM, the optimal dosage of reagents were 0.5 g nZVI/L and 3.0 mM H(2)O(2). At pH 6.1, the degradation of CMP followed two-stage first-order kinetic that composed of an induction period (first-stage) and a followed rapid degradation stage (second-stage). According to the effects of scavengers n-butanol and KI, hydroxyl radicals (OH), especially the surface-bounded •OH, had a dominant role in the oxidation of CMP. The degradation intermediates, carboxylic acids and chloride ion produced during the reaction process were monitored by high performance liquid chromatography (HPLC), liquid chromatography/mass spectrometry (LC/MS) and ion chromatography (IC). On the basis of these findings, the possible mechanistic steps of CMP degradation were proposed.
    Journal of hazardous materials 02/2011; 186(1):256-64. DOI:10.1016/j.jhazmat.2010.10.116 · 4.53 Impact Factor
Show more