Removal of high concentration p-nitrophenol in aqueous solution by zero valent iron with ultrasonic irradiation (US–ZVI)

Lai, Bo; Chen, Zhaoyu; Zhou, Yuexi; Yang, Ping; Wang, Juling; Chen, Zhiqiang

doi:10.1016/j.jhazmat.2013.02.002

Cited by 167 publications

(57 citation statements)

References 36 publications

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“…Thus, to achieve a higher Cr(VI) removal efficiency, a higher level of ultrasound power is helpful. Similar results have been also found in previous reports [20,[23][24][25]. Fig.…”

Section: Effect Of the Ultrasonic Powersupporting

confidence: 92%

“…It was demonstrated that after introducing ultrasound to nZVI/contaminant systems, the chemical reaction between nZVI and the contaminants was obviously accelerated [20][21][22][23][24][25][26]. For example, Liang et al [21] reported that ultrasound could significantly improve the mixing and dispersion of nZVI and enormously accelerate the heterogeneous reaction between nZVI and nitrite.…”

Section: Introductionmentioning

confidence: 99%

“…Weng et al [23] showed that a positive synergistic effect was observed for the decolouration of direct blue 15 when Fenton's reagent was combined with ultrasonic irradiation. Also, Lai et al [24] suggested that the US-ZVI system was high-efficiency for the removal of p-nitrophenol. But to the best of our knowledge, the reported literatures mainly focused on organic pollutants, there has been no report concerning Cr(VI) removal by the integrated technology of ultrasound and nZVI.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of highly active nanoscale zero-valent iron coupled with ultrasound for chromium(VI) removal

Zhou

et al. 2015

Chemical Engineering Journal

102

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“…Thus, to achieve a higher Cr(VI) removal efficiency, a higher level of ultrasound power is helpful. Similar results have been also found in previous reports [20,[23][24][25]. Fig.…”

Section: Effect Of the Ultrasonic Powersupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of highly active nanoscale zero-valent iron coupled with ultrasound for chromium(VI) removal

Zhou

et al. 2015

Chemical Engineering Journal

102

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“…In the acidic environment, ZVI corrodes rapidly in contrast to basic environment (Lai et al 2013). In addition to ZVI, PS can be oxidized in the acidic environment according to the following equations (Eqs.…”

Section: Effect Of Initial Solution Phmentioning

confidence: 99%

Efficient degradation of trichloroethylene in water using persulfate activated by reduced graphene oxide-iron nanocomposite

Ahmad

et al. 2015

Environ Sci Pollut Res

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Graphene oxide (GO) and nano-sized zero-valent iron-reduced graphene oxide (nZVI-rGO) composite were prepared. The GO and nZVI-rGO composite were characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR), energy-dispersive spectroscopy (EDS), and Raman spectroscopy. The size of nZVI was about 6 nm as observed by TEM. The system of nZVI-rGO and persulfate (PS) was used for the degradation of trichloroethylene (TCE) in water, and showed 26.5% more efficiency as compared to nZVI/PS system. The different parameters were studied to determine the efficiency of nZVI-rGO to activate the PS system for the TCE degradation. By increasing the PS amount, TCE removal was also improved while no obvious effect was observed by varying the catalyst loading. Degradation was decreased as the TCE initial concentration was increased from 20 to 100 mg/L. Moreover, when initial solution pH was increased, efficiency deteriorated to 80%. Bicarbonate showed more negative effect on TCE removal among the solution matrix. To better understand the effects of radical species in the system, the scavenger tests were performed. The •SO4(-) and •O2(-) were predominant species responsible for TCE removal. The nZVI-rGO-activated PS process shows potential applications in remediation of highly toxic organic contaminants such as TCE present in the groundwater. Graphical abstract Persulfate activated by reduced graphene oxide and nano-sized zero-valent iron composite can be used for efficient degradation of trichloroethylene (TCE) in water.

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“…It is well known that ·SO 4 − are mostly produced in the acidic or neutral pH, while ·OH are produced in the basic pH as described in Eqs. 2-4 (Lai et al 2013;Gomathi Devi et al 2009). When pH of solution at 3 and 5 was used, the degradation of AN was slightly enhanced compared to without adjusting the pH, showing that more ·SO 4 − radicals were produced.…”

Section: Effect Of Ph On the Generation And Intensity Of Rosmentioning

confidence: 99%

Effects of pH and Anions on the Generation of Reactive Oxygen Species (ROS) in nZVI-rGo-Activated Persulfate System

Ahmad

et al. 2015

Water Air Soil Pollut

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In this study, nanosized zero-valent iron-reduced graphene oxide (nZVI-rGO)-activated persulfate (PS) was used to investigate the generation of reactive oxygen species (ROS) for the degradation of trichloroethylene (TCE) in the aqueous solution. More than 98 % of TCE was degraded within 2 min under experimental conditions. The generation of ·OH increased when the pH was shifted toward the basic region while ·SO 4 − radicals' intensity increased in the acidic pH. Different scenarios have been observed in ·O 2 − generation in the neutral and strong basic pH and decreased in acidic or slightly basic pH. In addition, the intensity of ·OH was increased with the addition of HCO 3 − (10 mM) and NO 3 − (100 mM) but decreased in the presence of Cl − (10 and 100 mM), HCO 3 − (100 mM), and NO 3 − (10 mM). The degradation of anisole, probe for both ·OH and ·SO 4 − , was slightly enhanced by 10 mM NO 3 − anions but decreased in 100 mM salt solution. ·O 2 − intensity was increased while HCO 3 − (10 and 100 mM) and NO 3 − (100 mM) anions were used.nZVI-rGO-activated PS process could remove TCE in aqueous effectively, and the ROS generation and intensity were influenced by solution pH values and anions.

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Removal of high concentration p-nitrophenol in aqueous solution by zero valent iron with ultrasonic irradiation (US–ZVI)

Cited by 167 publications

References 36 publications

Evaluation of highly active nanoscale zero-valent iron coupled with ultrasound for chromium(VI) removal

Evaluation of highly active nanoscale zero-valent iron coupled with ultrasound for chromium(VI) removal

Efficient degradation of trichloroethylene in water using persulfate activated by reduced graphene oxide-iron nanocomposite

Effects of pH and Anions on the Generation of Reactive Oxygen Species (ROS) in nZVI-rGo-Activated Persulfate System

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