Degradation of TBBPA and BPA from aqueous solution using organo-montmorillonite supported nanoscale zero-valent iron

Peng, Xingxing; Tian, Ye; Liu, Shengwei; Jia, Xiaoshan

doi:10.1016/j.cej.2016.10.075

Cited by 76 publications

(25 citation statements)

References 47 publications

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“…Previous studies 26 – 28 reported that iron nanoparticles have a core–shell structure, and the shell was due to rapid oxidation of the nascent nZVI to iron oxides while the core was Fe 0 . This structure can preserve the iron core against fast oxidation 18 , 28 . Therefore, the core–shell structure of the Mt-nZVI material has strong oxidation resistance.…”

Section: Resultsmentioning

confidence: 99%

“…Gu et al 20 used this method and prepared subnano-sized ZVI using smectite clay as templates. The Mt-nZVI has been used to adsorb and degrade a variety of contaminants such as heavy metals 4 , 21 and organic contaminants 18 , 22 , which even showed higher performance in contaminant removal compared to bare nZVI due to synergetic effect between adsorption by Mt and removal by nZVI particles 17 .…”

Section: Introductionmentioning

confidence: 99%

“…Typically, the Fe(III) or Fe(II) was allowed to be homogeneously distributed on the template surfaces and then the nZVI particles were generated on the surfaces by adding NaBH 4 to reduce the ferric ions to Fe(0) 17 . In addition to the aforementioned support materials, montmorillonite (Mt) is low-cost with a high cation exchange capacity and a large specific surface area 18,19 . Gu et al 20 used this method and prepared subnano-sized ZVI using smectite clay as templates.…”

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confidence: 99%

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Removal of hexavalent chromium from aqueous solution by fabricating novel heteroaggregates of montmorillonite microparticles with nanoscale zero-valent iron

Yin

Shen

et al. 2020

Sci Rep

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this study fabricated novel heteroaggregates of montmorillonite (Mt) microparticles with nanoscale zero-valent iron (nZVi) (Mt-nZVi) and examined the removal of cr(Vi) by the Mt-nZVi through batch experiments. Spherical nZVi particles were synthesized by the liquid phase reduction method, which were then attached on the flat Mt surfaces in monolayer. The fabricated Mt-nZVI had similar removal efficiency for Cr(VI) compared to the monodispersed nZVI particles, but was much greater than that of nZVI aggregates. The removal efficiency of Mt-nZVI increased with decreasing its dosage and increasing initial Cr(VI) concentration, whereas had insignificant change with solution pH. the removal of cr(Vi) by Mt-nZVi was well described by the pseudo second-order kinetics and the Langmuir equilibrium model. the removal was spontaneous and exothermic, which was mainly due to chemsorption rather than intra-particle diffusion according to calculation of change in free energy and enthalpy and Weber-Morris model simulations. X-ray diffraction and X-ray photoelectron spectroscopy analysis revealed that the adsorption was likely due to reduction of cr(Vi) to cr(iii) by Fe(0) and co-precipitation in the form of oxide-hydroxide of Fe(III) and Cr(III). The fabricated Mt-nZVI showed the promise for in-situ soil remediation due to both high removal efficiency and great mobility in porous media. Nanoscale zero-valent iron (nZVI) has been shown to be very effective for treatment of various inorganic and organic pollutants in water in the past two decades 1,2 , due to its unique properties such as large specific surface area and high surface activity. However, the nZVI particles are readily to aggregate in water during the preparation and application because of attractive van der Waals force, high surface energy, and magnetic attractive force 3. The aggregation reduces specific surface areas of the nZVI, which can significantly decrease its reactivity and efficiency for treatment of contaminants 4. The aggregation also reduces the mobility of the nZVI in subsurface environments such as soil by sedimentation and straining at narrow pores 5 , and hence greatly limits its application for in-situ soil remediation. Various techniques have been developed to prevent nZVI aggregation and enhance its dispersion 6,7. For example, functional groups have been added on surfaces of nZVI via chemical modification (covalent or noncovalent functionalization) 8. Adding functional groups increases surface charge, and consequently enhances electrostatic repulsion between nZVI particles in electrolyte solutions and their dispersion. In addition, polymers and surfactants have been used to stabilize the nZVI particles by inducing the steric repulsion between them 9. However, it should be noted that adding functional groups or coating of these additives on nZVI particles masks the particle surfaces, which may decrease the efficiency of nZVI for contaminant treatment compared to bare monodispersed nZVI particles 10,11 .

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Removal of hexavalent chromium from aqueous solution by fabricating novel heteroaggregates of montmorillonite microparticles with nanoscale zero-valent iron

Yin

Shen

et al. 2020

Sci Rep

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“…Thus, it is evident that the nZVI nanoparticles were successfully immobilized and randomly distributed onto the surface of the LDH without clear aggregation. A similar conclusion has been already drawn when LDH‐supported nZVI as well as by applying other materials including bentonite and montmorillonite as support, which were found useful in enhancing the dispersibility and stability of nZVI. Such a core‐shell structure of nZVI (Figure f) is reflected by SAED cliche (Figure e), which clearly indicates the diffraction rings of the sample related to the partial oxidation of iron.…”

Section: Resultsmentioning

confidence: 99%

Chlorpromazine Electro‐oxidation at BDD Electrode Modified with nZVI Nanoparticles Impregnated NiAl LDH

et al. 2020

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Nanocomposite of nanoscale zero‐valent iron (nZVI) and layered double hydroxide (LDH) was used as modifier for boron‐doped diamond electrode in determination of anti‐psychotic drug chlorpromazine (CPZ). nZVI nanoparticles were prepared by liquid phase reduction of ferric chloride with sodium borohydride on the surface of NiAl LDH matrix owing to the strong exchange and confinement efficiency of LDH. The structure, binding and surface properties of the nZVI@LDH nanocomposite were monitored using powder X‐ray diffractometry, FT‐IR spectroscopy, scanning and transmission microscopy and BET techniques. The electrochemical properties of the modified electrode were investigated by CV and EIS, performed in a phosphate buffer containing ferro/ferricyanide as redox probe. The modified electrode exhibited excellent electrochemical performance compared with unmodified electrode. As regard potential application of the nanocomposite surface to the CPZ detection, square‐wave voltammetric signals showed a good linear correlation over CPZ concentrations in a broad range from 0.1 to 8.0 μM with low detection limit of 0.005 μM. Nevertheless, these results suggest that the proposed nanocomposite modifier surface provides exceptional synergy and significant enhancement effect to the voltammetric response of CPZ and thus could be applied as highly efficient and stable platform of sensors in clinical analysis.

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“…In recent years, quaternary ammonium salt (QAC)-modified organic montmorillonite has caught researchers' attention, due to its outstanding features listed above. Researchers have utilized cetyltrimethyl-ammonium bromide-modified organic montmorillonite as a supporting material for nanoscale, zero-valent iron to remove tetrabromobisphenol-A and bisphenol-A [21]. Researchers have also used didodecyldimethyl-ammonium bromide-modified organic montmorillonite as an absorbent material for thiophanate-methyl removal [22].…”

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Levofloxacin by Activated Persulfate with Magnetic CuFe2O4/MMT-k10 Nanocomposite: Characterization, Response Surface Methodology, and Degradation Mechanism

Yang

Huang

Wang

et al. 2020

Water

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In this study, a magnetic copper ferrite/montmorillonite-k10 nanocomposite (CuFe2O4/MMT-k10) was successfully fabricated by a simple sol-gel combustion method and was characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), the Brunner–Emmett–Teller (BET) method, vibrating sample magnetometer (VSM), and X-ray photoelectron spectroscopy (XPS). For levofloxacin (LVF) degradation, CuFe2O4/MMT-k10 was utilized to activate persulfate (PS). Due to the relative high adsorption capacity of CuFe2O4/MMT-k10, the adsorption feature was considered an enhancement of LVF degradation. In addition, the response surface methodology (RSM) model was established with the parameters of pH, temperature, PS dosage, and CuFe2O4/MMT-k10 dosage as the independent variables to obtain the optimal response for LVF degradation. In cycle experiments, we identified the good stability and reusability of CuFe2O4/MMT-k10. We proposed a potential mechanism of CuFe2O4/MMT-k10 activating PS through free radical quenching tests and XPS analysis. These results reveal that CuFe2O4/MMT-k10 nanocomposite could activate the persulfate, which is an efficient technique for LVF degradation in water.

show abstract

Degradation of TBBPA and BPA from aqueous solution using organo-montmorillonite supported nanoscale zero-valent iron

Cited by 76 publications

References 47 publications

Removal of hexavalent chromium from aqueous solution by fabricating novel heteroaggregates of montmorillonite microparticles with nanoscale zero-valent iron

Removal of hexavalent chromium from aqueous solution by fabricating novel heteroaggregates of montmorillonite microparticles with nanoscale zero-valent iron

Chlorpromazine Electro‐oxidation at BDD Electrode Modified with nZVI Nanoparticles Impregnated NiAl LDH

Efficient Removal of Levofloxacin by Activated Persulfate with Magnetic CuFe2O4/MMT-k10 Nanocomposite: Characterization, Response Surface Methodology, and Degradation Mechanism

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