Electro-peroxone treatment of Orange II dye wastewater

Bakheet, Belal; Yuan, Shi; Li, Laurent; Wang, Huijiao; Zuo, Jiane; Komarneni, Sridhar; Wang, Yujue

doi:10.1016/j.watres.2013.07.042

Cited by 192 publications

(79 citation statements)

References 48 publications

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“…No Fig. 2 Response surface showing the effects of GDC composition on the yield of ·OH in ozone-electrolysis process (current of 300 mA; ozonized gas flow rate of 0.3 L/min; inlet O 3 concentration of 9.8 mg/L) significant improvement of color removal was observed in ozone-electrolysis process, consisting with previous reports (Bakheet et al 2013;Hsu et al 2003). This may be due to the fact that electrolyte used in current work was Na 2 SO 4 .…”

Section: Performance Of Optimized Cnt-based Gdc In Ozone-electrolysissupporting

confidence: 76%

“…The electrogenerated H 2 O 2 can react with O 3 (i.e., the socalled peroxone oxidation) to produce ·OH (Eqs. (1) and (2)) (Bakheet et al 2013), thereby accelerating pollutant degradation in the coupled process.…”

Section: Introductionmentioning

confidence: 99%

“…While some authors stated that cathodic reduction of O 3 into · O 3 − was the main pathway of ·OH generation in ozoneelectrolysis system (Eqs. (3) and (4)) (Kishimoto et al 2008), others suggested that peroxone reaction played a critical role in ·OH formation (Bakheet et al 2013;Li et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Enhanced hydroxyl radical generation in the combined ozonation and electrolysis process using carbon nanotubes containing gas diffusion cathode

Zhang

et al. 2015

Environ Sci Pollut Res

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Combination of ozone together with electrolysis (ozone-electrolysis) is a promising wastewater treatment technology. This work investigated the potential use of carbon nanotube (CNT)-based gas diffusion cathode (GDC) for ozone-electrolysis process employing hydroxyl radicals (·OH) production as an indicator. Compared with conventional active carbon (AC)-polytetrafluoroethylene (PTFE) and carbon black (CB)-PTFE cathodes, the production of ·OH in the coupled process was improved using CNTs-PTFE GDC. Appropriate addition of acetylene black (AB) and pore-forming agent Na2SO4 could enhance the efficiency of CNTs-PTFE GDC. The optimum GDC composition was obtained by response surface methodology (RSM) analysis and was determined as CNTs 31.2 wt%, PTFE 60.6 wt%, AB 3.5 wt%, and Na2SO4 4.7 wt%. Moreover, the optimized CNT-based GDC exhibited much more effective than traditional Ti and graphite cathodes in Acid Orange 7 (AO7) mineralization and possessed the desirable stability without performance decay after ten times reaction. The comparison tests revealed that peroxone reaction was the main pathway of ·OH production in the present system, and cathodic reduction of ozone could significantly promote ·OH generation. These results suggested that application of CNT-based GDC offers considerable advantages in ozone-electrolysis of organic wastewater.

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Section: Performance Of Optimized Cnt-based Gdc In Ozone-electrolysissupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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Enhanced hydroxyl radical generation in the combined ozonation and electrolysis process using carbon nanotubes containing gas diffusion cathode

Zhang

et al. 2015

Environ Sci Pollut Res

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“…Due to the structural stability and complexity of dye molecules, they represent a real threat to the environment and human health (Njoku et al 2014). The traditional methods for the removal of dyes from the wastewater include air flotation (Liang et al 2014), sorbents adsorption (Tichonovas et al 2013), membrane separation (Türgay et al 2011), extraction (Bakheet et al 2013), chemical oxidation (Kumar et al 2013), electrochemistry (del Río et al 2011), froth floatation, and biological methods (Liu et al 2006). However, owing to the fact that adsorption is simple and can be carried out in a small area, approaches based on adsorption have been increasingly considered to remove dye from wastewater (Kaouah et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Removal of Methylene Blue from Aqueous Solution using Porous Biochar Obtained by KOH Activation of Peanut Shell Biochar

Han¹,

Chu²,

Liu³

et al. 2015

BioResources

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aBiochar from peanut shell was used as the precursor for the preparation of porous biochar by KOH activation. The pore structures of porous biochar also were characterized by scanning electron microscopy (SEM) and N2 adsorption/desorption. The adsorption performance for the removal of methylene blue (MB) was deeply investigated. The effects of impregnation ratio (KOH/biochar: w/w), activation temperature, and activation time on the removal of methylene blue by porous biochar were evaluated. In addition, the effects of initial MB concentration and pH value on the adsorption process were also studied. The optimum conditions for preparing porous biochar were obtained with 1.5:1 of impregnation ratio, 800 °C of activation temperature, and 90 min of the holding time in activation. Results indicated that the adsorption capacity was high even at higher initial MB concentrations. The adsorption process followed pseudosecond-order kinetics. The experimental adsorption isotherm was found to be best fitted with the Langmuir model, which implying that the adsorption of MB by porous biochar proceeded as a monolayer adsorption, and the maximum monolayer adsorption capacity of MB was 208 mg•g -1 .

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“…Therefore, effective approaches must be developed to remove azo dyes from waste water before its discharge into the environment. The existing techniques to remove dyes from dye-containing waste water include chemical coagulation/flocculation [2,3], ozonation [4], oxidation processes including electroperoxone treatment [5,6], ion exchange [7] and ultrafiltration [8]. However, these techniques have some disadvantages and limitations, such as high cost [9], generation of secondary pollutants, and intensive energy requirements.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of methylene blue and Orange II pollutants on activated carbon prepared from banana peel

Huang

Zou

et al. 2014

J Porous Mater

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Banana peel-activated carbon (BPAC) with a very high surface area of 1,950 m 2 g -1 was prepared and investigated for the removal of methylene blue (MB) or Orange II dye molecules from aqueous solutions. Results of adsorption experiments showed that the BPAC exhibited high adsorption capacity with cationic dyes. The maximal Orange II and MB uptakes were determined to be more than 333 and 1,263 mg g -1 , respectively. The zeta-potential analysis revealed that surface charge of BPAC is negative and hence the present activated carbon is excellent for adsorption of MB cationic dye from water. The adsorption equilibrium, kinetics, and thermodynamics of MB dye were investigated and the results indicated a monolayer chemical adsorption involving electrostatic attraction. BPAC was found to be a highly promising material for the effective removal of cationic contaminants such as MB dye from water.

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Electro-peroxone treatment of Orange II dye wastewater

Cited by 192 publications

References 48 publications

Enhanced hydroxyl radical generation in the combined ozonation and electrolysis process using carbon nanotubes containing gas diffusion cathode

Enhanced hydroxyl radical generation in the combined ozonation and electrolysis process using carbon nanotubes containing gas diffusion cathode

Removal of Methylene Blue from Aqueous Solution using Porous Biochar Obtained by KOH Activation of Peanut Shell Biochar

Adsorption of methylene blue and Orange II pollutants on activated carbon prepared from banana peel

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