Macroscopic and microscopic investigation of Cr(VI) immobilization by nanoscaled zero-valent iron supported zeolite MCM-41 via batch, visual, XPS and EXAFS techniques

Chen, Zhongshan; Wei, Dongli; Li, Qian; Wang, Xiangxue; Yu, Shujun; Liu, Lu; Liu, Bei; Xie, Shengyu; Wang, Jian; Chen, Diyun; Hayat, Tasawar; Wang, Xiangke

doi:10.1016/j.jclepro.2018.01.231

Cited by 96 publications

(31 citation statements)

References 46 publications

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“…Therefore, it could be concluded from kinetic parameters that adsorption, co-precipitation, and reduction occurred during the Cr(VI) removal process by BC-nZVI. Similarly, previous reports also tested the PFO and PSO models on different nZVI composites materials and found favorable matches [9,[25][26][27]. The equilibrium removal capacity for total Cr were 77.78 mg/g by nZVI, 136.47 mg/g by BC-nZVI (One day), 101.16 mg/g by BC-nZVI (One week), and 49.94 mg/g by BC-nZVI (One month), respectively.…”

Section: Kinetic Of Total Cr Removal By Bc-nzvimentioning

confidence: 53%

“…By these two kinetic equations, the removal effect of different materials was calculated, and the fitting of the kinetic data is shown in Figure 7 and Table 1. found favorable matches [9,[25][26][27]. The equilibrium removal capacity for total Cr were 77.78 mg/g by nZVI, 136.47 mg/g by BC-nZVI (One day), 101.16 mg/g by BC-nZVI (One week), and 49.94 mg/g by BC-nZVI (One month), respectively.…”

Section: Kinetic Of Total Cr Removal By Bc-nzvimentioning

confidence: 87%

“…2CrO4 − + 3Fe 2+ + 8H + → 2Cr 3+ + 3Fe 3+ + 4H2O(l) capacity of the material. The Cr 3+ and Fe 3+ precipitated together, as shown in Equations (10) and (11) and were adsorbed on flocs and BC [25].…”

Section: Degradation Mechanism For Reduction-adsorption Of Cr On Bc-nzvimentioning

confidence: 99%

“…Fe 3+ was flocculated on the surface of nZVI particles in the form of FeO(OH), which greatly increased the specific surface area and adsorption capacity of the material. The Cr 3+ and Fe 3+ precipitated together, as shown in Equations (10) and (11) and were adsorbed on flocs and BC [25]. capacity of the material.…”

Section: Degradation Mechanism For Reduction-adsorption Of Cr On Bc-nzvimentioning

confidence: 99%

“…The high resolution XPS spectra for Fe 2p orbit is displayed in Figure 3c. There were two peaks located at 711.6 eV and 725.3 eV corresponding to Fe(III), and two peaks located at 710.0 eV and 722.7 eV, corresponding to Fe(II), respectively [25]. However, the peaks of Fe 0 at 706 eV and 707 eV was not apparently detected in the XPS spectra, which was due to the rapid formation of iron oxide on the surface of nZVI particles and the XPS technology is only limited to surface detection [20].…”

Section: Kinetic Analysis Of Total Cr Removalmentioning

confidence: 99%

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Nanoscale Zero Valent Iron Supported by Biomass-Activated Carbon for Highly Efficient Total Chromium Removal from Electroplating Wastewater

Zhang

Zhu

Xiong

et al. 2019

Water

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The application potential of nanoscale zero valent iron (nZVI) in wastewater treatment is huge and has attracted a lot of attention. In this study, the composite material BC-nZVI was prepared by emulsion of nZVI and biomass-activated carbon (BC) under the mechanical agitation condition, and was characterized by SEM-EDX, XRD, XPS, and FTIR. The decontamination abilities of BC-nZVI were tested by the removal of total chromium (Cr) from electroplating wastewater. The results showed that the removal efficiencies of Cr in the electroplating wastewater by nZVI particles can be effectively improved when supported with BC, but cannot be improved in its storage capacity. The chemical adsorption process between the Cr and BC-nZVI is the main rate-limiting step in the removal of total Cr from wastewater, and multiple parameters such as dosage, pH, and initial concentration of Cr was found to affect the rate.

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Section: Kinetic Of Total Cr Removal By Bc-nzvimentioning

confidence: 53%

Section: Kinetic Of Total Cr Removal By Bc-nzvimentioning

confidence: 87%

Section: Degradation Mechanism For Reduction-adsorption Of Cr On Bc-nzvimentioning

confidence: 99%

Section: Degradation Mechanism For Reduction-adsorption Of Cr On Bc-nzvimentioning

confidence: 99%

Section: Kinetic Analysis Of Total Cr Removalmentioning

confidence: 99%

See 3 more Smart Citations

Nanoscale Zero Valent Iron Supported by Biomass-Activated Carbon for Highly Efficient Total Chromium Removal from Electroplating Wastewater

Zhang

Zhu

Xiong

et al. 2019

Water

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Porous‐Carbon‐Confined Formation of Monodisperse Iron Nanoparticle Yolks toward Versatile Nanoreactors for Metal Extraction

Wang

Luo

Chen

et al. 2018

Chemistry A European J

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All-in-one architectures in which uniform nanoscale zero-valent iron nanoparticles are wrapped in hollow porous carbon shells are highly desirable for environmental applications such as wastewater treatment and for use as catalysts, but their preparation remains a significant challenge. Herein, a spatially confined strategy for the in situ preparation of uniform Fe @mC (mC=micro/mesoporous carbon) yolk-shell nanospheres, in which the iron nanoparticles are encapsulated in thin, porous carbon shells, is reported. The elaborately designed Fe @mC yolk-shell nanospheres were obtained by utilizing silica- and phenolic-resin-coated magnetite nanoparticle core-shell structures as templates by means of selective etching and in situ thermal reduction. The highly dispersed iron nanoparticles with superior reduction capability can effectively remove metal pollutants (e.g., Au , Ag , and Cu ), the carbon shell acts as protective cover and prevents aggregation of iron nanoparticles, and the void space in the capsules serves as a reactor for reduction and catalytic reactions.

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Single and Binary Adsorption of Zn (II) and Cr (VI) Heavy Metals onto Synthesized Silica ‐Based MCM‐41

2019

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Effluents from numerous Industries like textile, paint, pharmaceutical, steel and electroplating industries liberate both Zinc [Zn (II)] and Chromium [Cr (VI)] heavy metals. In this work, adsorptive interaction of toxic Zn (II) heavy metal in aqueous solution with synthesized mesoporous silica based MCM‐41 was investigated. Further, the effects of presence of Cr (VI) heavy metal on the adsorption of Zn (II) and vice versa were investigated by simultaneous competitive binary adsorption from Cr (VI) and Zn (II) aqueous binary solution. Batch experiments were executed to see the effects of parameters like pH, adsorbent dose (m), adsorbate concentration and adsorption time (t). Optimum conditions for Zn (II) treatment were obtained as: initial pH (pHi) =7, m=0.1 g/L and t=2 h. Competitive adsorption of both Cr (VI) and Zn (II) from their binary solution was studied at 288− 308 K temperatures. Obtained equilibrium data were then fitted to different competitive multicomponent isotherm models like Langmuir (extended), Freundlich isotherm (extended), Sheindrof‐Rebuhn‐Sheintuch (SRS) isotherm and Redlich‐Peterson isotherm (modified) models, and various isotherm interaction parameters were calculated.

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Macroscopic and microscopic investigation of Cr(VI) immobilization by nanoscaled zero-valent iron supported zeolite MCM-41 via batch, visual, XPS and EXAFS techniques

Cited by 96 publications

References 46 publications

Nanoscale Zero Valent Iron Supported by Biomass-Activated Carbon for Highly Efficient Total Chromium Removal from Electroplating Wastewater

Nanoscale Zero Valent Iron Supported by Biomass-Activated Carbon for Highly Efficient Total Chromium Removal from Electroplating Wastewater

Porous‐Carbon‐Confined Formation of Monodisperse Iron Nanoparticle Yolks toward Versatile Nanoreactors for Metal Extraction

Single and Binary Adsorption of Zn (II) and Cr (VI) Heavy Metals onto Synthesized Silica ‐Based MCM‐41

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