Electrocatalytic oxidative treatment of real textile wastewater in continuous reactor: Degradation pathway and disposability study

Kaur, Pawanpreet; Kushwaha, Jai Prakash; Sangal, Vikas Kumar

doi:10.1016/j.jhazmat.2017.12.044

Cited by 84 publications

(43 citation statements)

References 32 publications

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“…Overall, morphology with more surface energy facets, rapid charge separation and intrinsic defects (strain) by Lanthanum doping can be the main origin of the remarkable electrocatalytic of the spindle‐like La/ZnO sample. These results are very interesting regarding the most used electrode in the literature are SnO 2 , boron doped diamond Ti/RuO 2 anodes . This study open new directions toward using inorganic active materials for electrocatalytic oxidation of wastewater.…”

Section: Resultsmentioning

confidence: 65%

“…On the scenario of electrochemistry up to now, numerous works have been done to develop high performance anodes for electrochemical oxidation processes such as, Ti/RuO 2 , aluminum‐based electrodes, Ti/ PtO x , BDD anode, Ti/RuO 2 ‐TiO 2 and Ti/Pt, Ti/RuO 2 /IrO 2 /TiO 2 , Fe 2 O 3 ‐modified kaolin, Ti/SnO 2 ‐Sb/PbO 2 . Therefore, the high catalytic activity, lower current and long life constitute the basis choice of electrode .…”

Section: Introductionmentioning

confidence: 99%

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Photo/Electrocatalytic Properties of Nanocrystalline ZnO and La–Doped ZnO: Combined DFT Fundamental Semiconducting Properties and Experimental Study

Ahsaine

Slassi

Naciri³

et al. 2018

ChemistrySelect

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This work reports the synthesis of nanocrystalline ZnO and 5% La‐doped ZnO (La/ZnO) materials for photo/electrocatalytic degradation of Rhodamine B. The samples were characterized by X‐Ray diffraction, scanning and transmission electron microscopy, X‐Ray photoelectron spectroscopy and diffuse reflectance spectra. The effect of La doping on electronic structure was investigated using density functional theory calculations (DFT), La‐doped ZnO showed an n‐type metallic nature compared to pristine ZnO and La doping creates occupied states within the band gap edge. Under UV light, La/ZnO showed higher kinetic constant and efficiency than ZnO. A possible mechanism was elaborated on the basis of DFT and active trapping measurements. Different initial Rhodamine B concentration were studied to assess the electro‐oxidation of RhB. The electrochemical degradation of RhB over La/ZnO spindles electrode was pronounced with three time's high kinetic constant. The superior electro/photoactivity of La/ZnO was due to its unique morphology, high charge separation of the charge carriers and higher conductivity induced by La‐doping (intermediary levels). Superoxide ions and holes were the main active species for the photodegradation. Whereas, synergetic effect of hydroxyl radicals and hypochlorite ions were responsible of the high RhB electrocatalytic degradation.

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Section: Resultsmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Photo/Electrocatalytic Properties of Nanocrystalline ZnO and La–Doped ZnO: Combined DFT Fundamental Semiconducting Properties and Experimental Study

Ahsaine

Slassi

Naciri³

et al. 2018

ChemistrySelect

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show abstract

“…They have one and more limitations including high cost of chemical coagulants and adsorbents, membrane fouling, sludge production and disposal issue, transfer of contaminants from one phase to another, inhibition of bacterial growth and generation of secondary pollutants during the process application [10]. Although biological processes are economic, simple and environmentally friendly alternatives [3,15], the textile dyes are difficult to biodegrade owing to their synthetic origin and complex structure [14,[16][17][18]. Furthermore, biological processes are necessary long time and high energy for treatment [15].…”

Section: Introductionmentioning

confidence: 99%

Color and COD Removal from Real Textile Wastewater using Nanoscale Zero-Value Iron (nZVI)

Tepe

Tunç

Hanay

2021

Gazi University Journal of Science

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Nanoscale zero-value iron (nZVI) has a high specific surface area and significant abilities to reduce contaminants. In this study, the removal of color and COD from real textile wastewater was studied by nZVI particles. A series of experiments were conducted to evaluate the effect of operational parameters such as solution pH, nZVI dosage and temperature on color and COD removal. The results showed that the color and COD removals mainly depend on solution pH. The color removal efficiencies were 96.3% at 436 nm, 97.8% at 525 nm and 98.0% at 620 nm, respectively at nZVI dosage of 0.3 g/L and initial pH of 3 after 180 minutes of reaction time at 25 ○C. Moreover, the maximum COD removal efficiency obtained under these conditions was 86%.

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“…This oxidation method has also made in an electrochemical system know as EAOP (Electrochemical advanced oxidation process). Some EAOP applications include: textile wastewater (Kaur & Kushwaha, 2018;Mukimin et al, 2015), olive processing, pharmaceutical, hospital (Ganzenko et al, 2014) and batik proccessing (Aris .…”

Section: Introductionmentioning

confidence: 99%

“…Ti/RuO2 is a potential electrode material that is applied because it is mechanically stable, effectively producing strong oxidizing agents (Cl2, ClOH, ClO -), high overpotential oxygen ≈ 2 V (Kaur et al, 2017). The Ti/RuO2 surface anode also takes H2O adsorption to be oxidized produce OH o which also function as a strongest oxidizer against (Kaur & Kushwaha, 2018). The stability of these metal oxide will be further enlarged by doping iridium .…”

Section: Introductionmentioning

confidence: 99%

Implementation of Electrocatalytic Reactor as Oxidation Unit for Residual Reagent Wastewater of Testing Laboratory

Mukimin

Wicaksono

Zen³

et al. 2018

j.ris.technol.pencegah.

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The remaining reagent from the sample analysis process become a significant source of hazardous waste of laboratory tasting activities. Methylene blue, phenol and oil are pollutants common in the residual reagent waste. The electrocatalytic reactor is effective oxidation units for these organic pollutants. The reactor was made for a 50 L capacity with cylindrical metal oxide as the anode. The three anodes which 6 cm in diameter and 50 cm in length were paired stainless cathode with a distance of 2.5 cm. The reactor was also equipped with a stirrer that is connected to the motor so that the mass transfer and oxidizing agents is more effective. The reactor application was carried out by feeding the residual reagent waste into the electrocatalytic unit and giving DC potential 5 Volt. Each COD content for reagent waste of detergent: 2864 mg/L, phenol: 838 mg/L and oil: 708 mg/L. The reactor has reduced COD to 2157 mg/L (detergent), 399 mg/L (phenol) and 506 mg/L (oil) for 120 minutes. The high COD content in residual is caused by solvent (chloroform or hexane) that used at extraction step in determining the process of a sample. This compound is tough to oxidize into CO2 by OH radical or hypochlorite acid formed at the anode during the electrolysis process.

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Electrocatalytic oxidative treatment of real textile wastewater in continuous reactor: Degradation pathway and disposability study

Cited by 84 publications

References 32 publications

Photo/Electrocatalytic Properties of Nanocrystalline ZnO and La–Doped ZnO: Combined DFT Fundamental Semiconducting Properties and Experimental Study

Photo/Electrocatalytic Properties of Nanocrystalline ZnO and La–Doped ZnO: Combined DFT Fundamental Semiconducting Properties and Experimental Study

Color and COD Removal from Real Textile Wastewater using Nanoscale Zero-Value Iron (nZVI)

Implementation of Electrocatalytic Reactor as Oxidation Unit for Residual Reagent Wastewater of Testing Laboratory

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