Treatment of ammunition wastewater by the combined Fe 0 /air and Fenton process (1 st Fe 0 /air-Fenton-2 nd Fe 0 /air)

Yuan, Yue; Lai, Bo; Yang, Ping; Zhou, Yuexi

doi:10.1016/j.jtice.2016.05.021

Cited by 16 publications

(9 citation statements)

References 34 publications

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“…The lower pH values may favor the dissolution of passivating species (e.g., ferrous hydroxide) and other protective layers depositing on the surface of Fe 0 , thereby maintaining the number of active sites. The Fenton-like reactions in the presence of dissolved oxygen and without H 2 O 2 could be enhanced as well at low pH [79]. A similar conclusion has been reached by Cheng et al, who also suggested that weaker and more selective oxidants like FeO 2+ can be produced at higher pH (Equation (7)).…”

Section: Effect Of Ph On Zvi Performancementioning

confidence: 55%

“…The cited authors found a 56% decrease in ● OH production by increasing pH from 3 to 4, and a further decrease when raising the pH to 5 [47]. Yuan et al have shown that the COD removal efficiency of ZVI-Fenton increased rapidly (from 1.3% to 62.4%) by decreasing the initial pH from 9 to 2.5, while a further pH decrease from 2.5 to 2 had little effect on COD removal [79]. The lower pH values may favor the dissolution of passivating species (e.g., ferrous hydroxide) and other protective layers depositing on the surface of Fe 0 , thereby maintaining the number of active sites.…”

Section: Effect Of Ph On Zvi Performancementioning

confidence: 99%

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Effect of pH on Zero Valent Iron Performance in Heterogeneous Fenton and Fenton-Like Processes: A Review

2018

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Heterogeneous Fenton processes with solid catalysts have gained much attention for water and wastewater treatment in recent years. In the field of solid catalysts, zero valent iron (ZVI) is among the most applicable due to its stability, activity, pollutant degradation properties and environmental friendliness. The main limitation in the use of ZVI in heterogeneous Fenton systems is due to its deactivation in neutral and alkaline conditions, and Fenton-like processes have been developed to overcome this difficulty. In this review, the effect of solution pH on the ZVI-Fenton performance is discussed. In addition, the pH trend of ZVI efficiency towards contaminants removal is also considered in oxic solutions (i.e., in the presence of dissolved O2 but without H2O2), as well as in magnetic-field assisted Fenton, sono-Fenton, photo-Fenton and microwave-Fenton processes at different pH values. The comparison of the effect of pH on ZVI performance, taking into account both heterogeneous Fenton and different Fenton-like processes, can guide future studies for developing ZVI applications in water and wastewater treatment.

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Section: Effect Of Ph On Zvi Performancementioning

confidence: 55%

Section: Effect Of Ph On Zvi Performancementioning

confidence: 99%

Effect of pH on Zero Valent Iron Performance in Heterogeneous Fenton and Fenton-Like Processes: A Review

2018

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“…For adsorption and co-precipitation, the iron oxide and hydroxides on the surface of nZVI particles act as good sorbents for a wide variety of chemicals, and these materials remove pollutants by electrostatic interactions and surface mediated complexation, especially under neutral and alkaline conditions. Numerous studies have shown that Fe–H 2 O systems under aerobic conditions will produce hydroxyl radicals according to eqn (1)–(3) , 27 which could potentially enhance the removal of pollutants: Fe + O 2 + 2H + → Fe 2+ + H 2 O 2 Fe 2+ + H 2 O 2 → Fe 3+ + ·OH + OH − 2Fe 3+ + Fe 0 → 3Fe 2+ …”

Section: Introductionmentioning

confidence: 99%

Degradation of the antibiotic ornidazole in aqueous solution by using nanoscale zero-valent iron particles: kinetics, mechanism, and degradation pathway

et al. 2018

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“…Due to the small particle size, high density, high specific surface area and high efficiency of ZVI particle (Yuan et al 2016a;Zhang et al 2017), it can act as a constant source of Fe 2+ and react with iron continuously for removing a wide range of contaminants according to Eqs. ( 4) and (5) (Zha et al 2014;Yuan et al 2016b;Raji et al 2020):…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Peroxide/Zero-ValentIron/Persulfate Approach for Sunset Yellow Dye Degradation: Operating Parameters and Synergistic Effect

Ahmadi

Feizi²

2021

Environ. Process.

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The presence of dye contaminants in industrial effluents has become a public health concern and environmental issue. In this study, Zero Valent Iron (ZVI) was employed as a catalyst to activate persulfate (PS) and hydrogen peroxide (H 2 O 2 ) for removal of Sunset Yellow (SY) from aqueous solutions using integrated H 2 O 2 /ZVI/PS process. In this regard, it is essential to obtain the best performance of the proposed H 2 O 2 /ZVI/PS system through optimizing its operational parameters including initial pH, H 2 O 2 concentration, PS concentration, and Fe o dosage. According to the results, about 100% efficiency was obtained by the H 2 O 2 /ZVI/PS for dye removal at pH = 3, ZVI 50 mg/L, 1 mM H 2 O 2 concentration, 1 mM PS concentration, and 30 min reaction time. The kinetic study showed that the H 2 O 2 /ZVI/PS process followed the first-order kinetic model. The effect of some anions on decolorization was also studied. According to the results, the order of inhibiting effect of anions on the performance of H 2 O 2 /ZVI/PS system was as follows: NO 2 − > NO 3 − > Cl − > HCO 3 − . The Total Organic Carbon (TOC) test showed that about 65% of mineralization was achieved after 30 min. Moreover, the ZVI particles showed a suitable efficiency after five cycles, and hence, they can be used as an eco-friendly, cost effective and reusable catalyst for the treatment of wastewaters contaminated with organic dye.

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Treatment of ammunition wastewater by the combined Fe 0 /air and Fenton process (1 st Fe 0 /air-Fenton-2 nd Fe 0 /air)

Cited by 16 publications

References 34 publications

Effect of pH on Zero Valent Iron Performance in Heterogeneous Fenton and Fenton-Like Processes: A Review

Effect of pH on Zero Valent Iron Performance in Heterogeneous Fenton and Fenton-Like Processes: A Review

Degradation of the antibiotic ornidazole in aqueous solution by using nanoscale zero-valent iron particles: kinetics, mechanism, and degradation pathway

Hydrogen Peroxide/Zero-ValentIron/Persulfate Approach for Sunset Yellow Dye Degradation: Operating Parameters and Synergistic Effect

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