Effect factors, kinetics and thermodynamics of remediation in the chromium contaminated soils by nanoscale zero valent Fe/Cu bimetallic particles

Zhu, Fang; Li, Luwei; Ma, Shufang; Shang, Zhifeng

doi:10.1016/j.cej.2016.05.072

Cited by 137 publications

(39 citation statements)

References 23 publications

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“…This phenomenon can further contribute to the decolorization of AO7 due to the anionic characteristic of AO7 under the examined conditions. Thus, coagulation/flocculation and adsorption processes are involved for the decolorization of AO7 in mFe/Cu‐BPs system, where similar phenomena were reported for the degradation of methylene blue and chromium . On the other hand, when the initial pH was further increased from 6.5 to 8.0, the decolorization efficiency and k obs significantly declined to 85.47% and 0.0660 min −1 ( R 2 =0.9922), respectively.…”

Section: Resultssupporting

confidence: 67%

“…In contrast to the parent molecule, the generated intermediates from the initial scission of azo bonds require prolonged reaction time to completely further degrade them into byproducts . Thus, it could be expected that a series of coagulation/flocculation and adsorption processes may be involved in the mFe/Cu‐Bps system, which could allow the improvement of COD and TOC removal efficiencies .

AO 7 + {ne}^{-} \to intermediates + {ne}^{-} \to {CO}_{2} + H_{2} O + degradation products

AO 7 + OH \cdot \to intermediates + OH \cdot \to {CO}_{2} + H_{2} O + degradation products

AO 7 + {true[normalH true]}_{abs} \to intermediates + {true[normalH true]}_{abs} \to {CO}_{2} + H_{2} O + degradation products

…”

Section: Resultsmentioning

confidence: 99%

“…In contrast to the parent molecule, the generated intermediates from the initial scission of azo bonds require prolonged reaction time to completely further degrade them into byproducts [43]. Thus, it could be expected that a series of coagulation/flocculation and adsorption processes may be involved in the mFe/Cu-Bps system, which could allow the improvement of COD and TOC removal efficiencies [11,32]…”

Section: Effect Of the Initial Ao7 Concentration On The Decolorizatiomentioning

confidence: 99%

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Synthesis of microsize Fe/Cu bimetallic particles using in situ acid‐mediated coating: Application on decolorization of azo dye acid orange 7

Jung

Choi

Lee

et al. 2017

Env Prog and Sustain Energy

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Iron‐based bimetallic particle has become an attractive material in environmental remediation, particularly for wastewater treatment. However, it is yet to be applied in large scale processes, mainly due to the requirement of multistep syntheses for the desired materials, as well as the rigorous control of the conditions for its synthesis. This study introduces a facile methodology to synthesize micro‐size iron/copper bimetallic particles (mFe/Cu‐BPs) by in situ coating of Cu on the surface of Fe in an acidic media for the removal of azo dye Acid Orange 7 (AO7) in aqueous media. Morphological analyses showed that Cu planted on the surface of the particles exhibit a dense leaf‐like structure with great connectivity and electron movement between Fe0 core and Cu shell. In addition, the effects on the decolorization of AO7 via key parameters such as theoretical Cu mass loading (TMLCu), initial pH, dosage, and initial AO7 concentration were assessed. Experimental results revealed that the decolorization efficiency of AO7 was highly dependent on the operational conditions. Under optimal conditions (TMLCu of 0.6 g Cu/g Fe, initial pH of 3.0, mFe/Cu‐BP dosage of 45 g/L, and initial AO7 concentration of 1000 mg/L), decolorization of AO7 as a function of reaction time was investigated via UV‐vis spectrometry, which confirmed that the azo bond of AO7 successfully cleaved by mFe/Cu‐BPs. The maximum decolorization, COD, and TOC removal efficiencies were found to be 99.55, 83.91, and 73.81% after 30 min of reaction time, respectively. Lastly, the potential mechanism for the decolorization of AO7 is proposed. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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Section: Resultssupporting

confidence: 67%

AO 7 + {ne}^{-} \to intermediates + {ne}^{-} \to {CO}_{2} + H_{2} O + degradation products

AO 7 + OH \cdot \to intermediates + OH \cdot \to {CO}_{2} + H_{2} O + degradation products

AO 7 + {true[normalH true]}_{abs} \to intermediates + {true[normalH true]}_{abs} \to {CO}_{2} + H_{2} O + degradation products

…”

Section: Resultsmentioning

confidence: 99%

“…In contrast to the parent molecule, the generated intermediates from the initial scission of azo bonds require prolonged reaction time to completely further degrade them into byproducts [43]. Thus, it could be expected that a series of coagulation/flocculation and adsorption processes may be involved in the mFe/Cu-Bps system, which could allow the improvement of COD and TOC removal efficiencies [11,32]…”

Section: Effect Of the Initial Ao7 Concentration On The Decolorizatiomentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of microsize Fe/Cu bimetallic particles using in situ acid‐mediated coating: Application on decolorization of azo dye acid orange 7

Jung

Choi

Lee

et al. 2017

Env Prog and Sustain Energy

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“…Luadthong et al used copperferrite/spinal-oxide catalyst for methnolysis of palm oil [15]. Porous FeNi oxide nano sheets have been studied as a catalyst for groundwater contaminant treatment [16]. Nano zero valent Fe/Cu have been used by Zhu et al for the remediation of chromium in soil [17].…”

Section: Introductionmentioning

confidence: 99%

Efficient transformation in characteristics of cations supported-reduced graphene oxide nanocomposites for the destruction of trichloroethane

Farooq

Danish

Brusseau

et al. 2017

Applied Catalysis A: General

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Experiments were conducted to investigate the use of graphene-oxide supported metallic nanocomposites for improving the degradation of trichloroethane (TCA) by sodium percarbonate (SPC). Two methods of production, chemical reduction (CR) and solvo-thermal (ST), were tested for preparation of single (Fe) and binary (Fe-Cu) nanocomposites supported by reduced graphene oxide (rGO). A variety of analytical techniques including N2 adsorption Brunauer-Emmett-Teller (BET), x-ray diffraction (XRD), fourier-transfrom infrared spectroscopy (FTIR), and transmisison electron microscopy (TEM) were applied to characterize the physicochemical and microstructural properties of the synthesized nanocomposites. The characterization indicated that the CR method produced nanocomposites that comprised only mesoporous structure. Conversely, both micro and mesoporous structures were present for samples produced with the ST method. The synthesized single and bimetallic composites produced from the ST method showed higher surface areas, i.e. 93.6 m2/g and 119.2 m2/g as compared to the ones synthesized via the CR method, i.e. 13.8 m2/g and 38.0 m2/g respectively. The results of FTIR and XRD analyses confirmed that the ST method produced highly crystalline nanocomposites. SEM and TEM analysis validated that metallic particles with definite morphology well distributed on the surface of rGO. X-ray photoelectron spectroscopy (XPS) analysis confirmed the homogeneity nanocomposites and occurrence of variation in copper oxidation states during degradation process. EDS mapping validate the homogeneous distribution of Cu and Fe at reduced graphene oxide surface. The Fe-Cu/rGO (ST) activated SPC system effectively degraded TCA (92%) in 2.5 h at low nanocomposite dose compared to the Fe-Cu/rGO (CR) and only Fe, for which the maximum degradation efficiencies achieved were 81% and 34%. In conclusion, excellent catalytic characteristics were observed for the ST-synthesized single and bimetallic (Fe/rGO, Fe-Cu/rGO) catalysts. These catalysts were successful in improving the degradation of TCA via activated SPC.

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“…This problem is usually overcome by cementing a second metal (preferably inert, such as Ag, Cu, Ni, Pd, Co) on to the surface of the transition metal, thus preventing the formation of the self-inhibiting film [105,106]. Such bimetallic combinations, for example nZVI/Cu, demonstrate pseudo-first-order kinetics or Langmuir-Hinshelwood first-order kinetics [105,107]. The second metal acts as an electron shuttle between the two metal systems, thus forming a catalyst.…”

Section: Nanoadsorbents For Chromium Remediationmentioning

confidence: 99%

Removal of chromium from industrial effluents using nanotechnology: a review

Mitra

Sarkar

Sen

2017

Nanotechnol. Environ. Eng.

138

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The presence of chromium in industrial effluents has become a huge problem worldwide as hexavalent chromium is highly toxic to animals due to its ability to generate reactive oxygen species in cells. The trivalent state of chromium, on the other hand, is significantly less toxic and also serves as an essential element in trace amounts. When industries such as electroplating, tannery, dyeing and others release their effluents into water bodies, hexavalent chromium enters the food chain and, consequently, reaches humans in a biomagnified form. Many remediation processes for removal of hexavalent chromium have been researched and reviewed extensively. These include chemical reduction to trivalent chromium, solvent extraction, chelation and adsorption, among others. It has been generally concluded that adsorption (and/or subsequent reduction) of hexavalent chromium is the best method. However, relatively little is known about the potential of using nanoparticles as adsorbents for the removal of hexavalent chromium from industrial effluents. This method of nanoremediation is more effective than conventional remediation methods and is cost-effective for the industry in the long run. This article reviews the various remediation methods of hexavalent chromium, with emphasis on the field of nanoremediation.

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Effect factors, kinetics and thermodynamics of remediation in the chromium contaminated soils by nanoscale zero valent Fe/Cu bimetallic particles

Cited by 137 publications

References 23 publications

Synthesis of microsize Fe/Cu bimetallic particles using in situ acid‐mediated coating: Application on decolorization of azo dye acid orange 7

Synthesis of microsize Fe/Cu bimetallic particles using in situ acid‐mediated coating: Application on decolorization of azo dye acid orange 7

Efficient transformation in characteristics of cations supported-reduced graphene oxide nanocomposites for the destruction of trichloroethane

Removal of chromium from industrial effluents using nanotechnology: a review

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