Enhanced dechlorination of 2,4-dichlorophenol by recoverable Ni/Fe–Fe 3 O 4 nanocomposites

Xu, Chunli; Li, Rui; Chen, Lvjun; Tang, Jialu

doi:10.1016/j.jes.2015.10.033

Cited by 30 publications

(8 citation statements)

References 44 publications

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“…20,30 Moreover, the byproducts in the solution might affect the dechlorination of 4-CP by Fe 3 O 4 nanoparticles. 31 Moreover, there was an obvious decline of pH value in each solution system over time in the abovementioned studies (Fig. A4 in ESI †), which indicates that the amount of acidic matter generated during the reaction is in accordance with a published study.…”

Section: The Mechanism Of 4-cp Removalsupporting

confidence: 85%

Catalytic oxidation of 4-chlorophenol with magnetic Fe₃O₄ nanoparticles: mechanisms and particle transformation

Cheng

et al. 2015

RSC Adv.

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Section: The Mechanism Of 4-cp Removalsupporting

confidence: 85%

Catalytic oxidation of 4-chlorophenol with magnetic Fe₃O₄ nanoparticles: mechanisms and particle transformation

Cheng

et al. 2015

RSC Adv.

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“…Precious metals such as Pd, Ag, Pt, Ni, Zn, etc. [3,5,6,[13][14][15] are added as the catalyst and offer superior hydrogenation activity. However, these composite metal materials cannot handle the organochlorine pollutants in environmental water.…”

Section: Introductionmentioning

confidence: 99%

Enhanced hydrodechlorination of 4-chlorophenol by Cu/Fe bimetallic system via ball-milling

Liu¹,

Chen²,

Xu³

et al. 2017

Desalination and Water Treatment

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a b s t r ac tA stable and cheap Cu/Fe bimetallic system was first prepared by ball-milling (BM) to dechlorinate 4-chlorophenol (4-CP). The enhanced hydrodechlorination activity of the resulting bimetallic system was mainly attributed to the homogenous distribution of Cu catalyst in the bulk Fe particles. The homogeneity increases the speed of electron transfer and takes advantage of hydrogenation. The prepared and used BM Cu/Fe bimetallic systems were visualized through scanning electron microscopy/ energy-dispersive X-ray spectrometry (SEM/EDS) with image mapping. Dechlorination benefited the metal content, BM time and initial solution pH because there is an overall kinetic equilibrium between the rate of electron generation by Fe and the rate of hydrogenation by Cu. We note over 93% dechlorination efficiency for 50 ppm 4-CP at pH 3.0 by 100 g/L of 5% Cu/Fe (wt%) ball-milled for 8 h. The BM Cu/Fe bimetallic system showed high sustainability to coexisting ions. It is stable. Its dechlorination reactivity remained high and reproducible during five successive applications. No Cu was dissolved during the experiments. The remaining Cu can be completely recovered by re-ball-milling with Fe powders, and they showed stable dechlorination activity.

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“…The degradation rate of 2,4-DCP reached 96.9% and the yield of phenol was 86.1% within 120 min eventually. Significantly, the yield of phenol did not reach 100% with a loss of mass of about 14%, which could be attributed to adsorption on the Fe 0 conversion products [ 30 , 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

Performance, Reaction Pathway and Kinetics of the Enhanced Dechlorination Degradation of 2,4-Dichlorophenol by Fe/Ni Nanoparticles Supported on Attapulgite Disaggregated by a Ball Milling–Freezing Process

Wang

Liu

et al. 2022

Materials

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Attapulgite (ATP) disaggregated by a ball milling–freezing process was used to support Fe/Ni bimetallic nanoparticles (nFe/Ni) to obtain a composite material of D-ATP-nFe/Ni for the dechlorination degradation of 2,4-dichlorophenol (2,4-DCP), thus improving the problem of agglomeration and oxidation passivation of nanoscale zero-valent iron (nFe) in the dechlorination degradation of chlorinated organic compounds. The results show that Fe/Ni nanoparticle clusters were dispersed into single spherical particles by the ball milling–freezing-disaggregated attapulgite, in which the average particle size decreased from 423.94 nm to 54.51 nm, and the specific surface area of D-ATP-nFe /Ni (97.10 m2/g) was 6.9 times greater than that of nFe/Ni (14.15 m2/g). Therefore, the degradation rate of 2,4-DCP increased from 81.9% during ATP-nFe/Ni application to 96.8% during D-ATP-nFe/Ni application within 120 min, and the yield of phenol increased from 57.2% to 86.1%. Meanwhile, the reaction rate Kobs of the degradation of 2,4-DCP by D-ATP-nFe/Ni was 0.0277 min−1, which was higher than that of ATP-nFe/Ni (0.0135 min−1). In the dechlorination process of 2,4-DCP by D-ATP-nFe/Ni, the reaction rate for the direct dechlorination of 2,4-DCP of phenol (k5 = 0.0156 min−1) was much higher than that of 4-chlorophenol (4-CP, k2 = 0.0052 min−1) and 2-chlorophenol (2-CP, k1 = 0.0070 min−1), which suggests that the main dechlorination degradation pathway for the removal of 2,4-DCP by D-ATP-nFe/Ni was directly reduced to phenol by the removal of two chlorine atoms. In the secondary pathway, the removal of one chlorine atom from 2,4-DCP to generate 2-CP or 4-CP as intermediate was the rate controlling step. The final dechlorination product (phenol) was obtained when the dechlorination rate accelerated with the progress of the reaction. This study contributes to the broad topic of organic pollutant treatment by the application of clay minerals.

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Enhanced dechlorination of 2,4-dichlorophenol by recoverable Ni/Fe–Fe 3 O 4 nanocomposites

Cited by 30 publications

References 44 publications

Catalytic oxidation of 4-chlorophenol with magnetic Fe₃O₄ nanoparticles: mechanisms and particle transformation

Catalytic oxidation of 4-chlorophenol with magnetic Fe₃O₄ nanoparticles: mechanisms and particle transformation

Enhanced hydrodechlorination of 4-chlorophenol by Cu/Fe bimetallic system via ball-milling

Performance, Reaction Pathway and Kinetics of the Enhanced Dechlorination Degradation of 2,4-Dichlorophenol by Fe/Ni Nanoparticles Supported on Attapulgite Disaggregated by a Ball Milling–Freezing Process

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Enhanced dechlorination of 2,4-dichlorophenol by recoverable Ni/Fe–Fe 3 O 4 nanocomposites

Cited by 30 publications

References 44 publications

Catalytic oxidation of 4-chlorophenol with magnetic Fe3O4 nanoparticles: mechanisms and particle transformation

Catalytic oxidation of 4-chlorophenol with magnetic Fe3O4 nanoparticles: mechanisms and particle transformation

Enhanced hydrodechlorination of 4-chlorophenol by Cu/Fe bimetallic system via ball-milling

Performance, Reaction Pathway and Kinetics of the Enhanced Dechlorination Degradation of 2,4-Dichlorophenol by Fe/Ni Nanoparticles Supported on Attapulgite Disaggregated by a Ball Milling–Freezing Process

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Catalytic oxidation of 4-chlorophenol with magnetic Fe₃O₄ nanoparticles: mechanisms and particle transformation

Catalytic oxidation of 4-chlorophenol with magnetic Fe₃O₄ nanoparticles: mechanisms and particle transformation