Phosphate modification enables high efficiency and electron selectivity of nZVI toward Cr(VI) removal

Li, Meiqi; Mu, Yi; Shang, Hai; Mao, Chengliang; Cao, Shiyu; Ai, Zhihui; Zhang, Lizhi

doi:10.1016/j.apcatb.2019.118364

Cited by 116 publications

(49 citation statements)

References 47 publications

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“…TheNi II removal rate of CnZVI was only enhanced by 1.4 times in the Ar atmosphere, much lower than that (4.5 times) of nZVI (Figure S14c), suggesting an unprecedented high O 2 resistance of CnZVI and its high electron selectivity for the Ni II reduction. [35] We believe that this high O 2 resistance of CnZVI is arisen from the strengthened electrostatic interaction between Ni II and its oxide shell, which enlarged the concentration gradient of Ni II on the surface and thus "insulated" O 2 from the iron core (Figure S14d).…”

Section: àmentioning

confidence: 98%

Kirkendall Effect Boosts Phosphorylated nZVI for Efficient Heavy Metal Wastewater Treatment

Shang

et al. 2021

Angew Chem Int Ed

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Removal of non-biodegradable heavy metals has been the top priority in wastewater treatment and the development of green technologies remains asignificant challenge.W e demonstrate that phosphorylated nanoscale zero-valenti ron (nZVI) is promising for removal of heavy metals (Ni II ,C u II , Cr VI ,H g II )v ia ab oosted Kirkendall effect. Phosphorylation confines tensile hoop stress on the nZVI particles and "breaks" the structurally dense spherical nZVI to produce numerous radial nanocracks.E xemplified by Ni II removal, the radial nanocracks favor the facile inward diffusion of Ni II and the rapid outwardtransport of electrons and ferrous ions through the oxide shell for surface (Ni II /electron) and boundary (Ni II / Fe 0 )g alvanic exchange.A ccompanied by ap ronounced hollowing phenomenon, phosphorylated nZVI can instantly reduce and immobilizeN i II throughout the oxide shell with ah igh capacity (258 mg Ni g À1 Fe). Forr eal electroplating factory wastewater treatment, this novel nZVI performs simultaneous Ni II and Cu II removal, producing effluent of stable quality that meets local discharge regulations.

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Section: àmentioning

confidence: 98%

Kirkendall Effect Boosts Phosphorylated nZVI for Efficient Heavy Metal Wastewater Treatment

Shang

et al. 2021

Angew Chem Int Ed

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119

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“…With the rapid development of industrial production, the pollution of water and land resources by heavy metals is becoming increasingly serious [ 1 , 2 , 3 ]. Water-soluble, non-biodegradable hexavalent chromium Cr(VI), which easily penetrates through food chain enrichment, can induce cellular oxidative stress, leading to DNA damage, gene mutation, fetal malformation, and carcinogenesis, is one of the most dangerous heavy metals [ 4 , 5 ]. Cr(VI) is widely applied in smelting, electroplating, painting, chemical manufacturing, and tanned leather [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Ren

Gong

et al. 2020

Nanomaterials

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Exploiting excellent photocatalytic activity and stable heterostructure composites are of critical importance for environmental sustainability. The spherical Bi2WO6/Bi2S3/MoS2 n-p heterojunction is first prepared via an in situ hydrothermal method using Bi2WO6, Na2MoO4·2H2O, and CH4N2S, in which the intermediate phase Bi2S3 is formed due to chemical coupling interaction of Bi2WO6 and CH4N2S. Scanning electron microscopy indicates that the compactness of the sample can be easily adjusted by changing the contents of S and Mo sources in the solution. The results of ultraviolet–visible (UV–vis) diffuse reflectance spectra, photoluminescence, transient photocurrent response, and electrochemical impedance spectra indicate that the formation of heterojunctions contributes to enhancing visible-light utilization and promoting photogenerated carrier separation and transfer. The composite material is used as a catalyst for the visible light photocatalytic reduction of Cr(VI). Remarkably, the optimal Bi2WO6/Bi2S3/MoS2 n-p heterojunction achieves the greatest Cr(VI) reduction rate of 100% within 75 min (λ > 420 nm, pH = 2); this rate is considerably better than the Cr(VI) reduction rate of pure Bi2WO6. The recycling experiment also reveals that the photocatalytic performance of the n-p heterojunction toward Cr(VI) is still maintained at 80% after three cycles, indicating that the n-p heterojunction has excellent structural stability. The capture experiment proves that the main active species in the system are electrons. The reasonable mechanism of Bi2WO6/Bi2S3/MoS2 photocatalytic reduction Cr(VI) is proposed. Our work provides new research ideas for the design of ternary heterojunction composites and new strategies for the development of photocatalysts for wastewater treatment.

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“…After elucidating the improved reactivity of ZVI by the WMF, the undesired reactions of ZVI with the non-target compounds (e.g., O 2 and H 2 O/H + ) may be concurrently inhibited (Gu et al, 2017;He et al, 2020;Li et al, 2017bLi et al, , 2018Li et al, , 2020bQiao et al, 2018;Zhang et al, 2020). There may be a trade-off between the reactivity and electron selectivity of ZVI in the presence of WMF (Qiao et al, 2018).…”

Section: Effect Of Wmf On the Selectivity Of Zvi Toward Se(iv)/ / / / /Se(vi)mentioning

confidence: 99%

Reactivity and selectivity of zerovalent iron toward selenium oxyanions under aerobic conditions

Li¹,

Sun²,

Guan³

2021

Environmental Technologies to Treat Selenium Pollution

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Phosphate modification enables high efficiency and electron selectivity of nZVI toward Cr(VI) removal

Cited by 116 publications

References 47 publications

Kirkendall Effect Boosts Phosphorylated nZVI for Efficient Heavy Metal Wastewater Treatment

Kirkendall Effect Boosts Phosphorylated nZVI for Efficient Heavy Metal Wastewater Treatment

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Reactivity and selectivity of zerovalent iron toward selenium oxyanions under aerobic conditions

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