Decontamination of wastewaters containing synthetic organic dyes by electrochemical methods. An updated review

Brillas, Enric; Martínez‐Huitle, Carlos A.

doi:10.1016/j.apcatb.2014.11.016

Cited by 1,892 publications

(927 citation statements)

References 207 publications

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“…Therefore, researchers have been studying EAOPs to find the most efficient material, operating parameters, and process to completely degrade highly polluted and recalcitrant wastewater. Several reviews have reported the application and prospects of EAOP for wastewater treatment ( Gutiérrez and Crespi 1999, Martínez-Huitle and Brillas 2009, Brillas and Martínez-Huitle 2015, Fernandes et al 2015.…”

Section: Electrochemical Oxidationmentioning

confidence: 99%

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Buthiyappan

Raman

Daud

2016

Reviews in Chemical Engineering

243

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AbstractIn the past few years, there have been many researches on the use of different types of homogenous catalyst for the degradation of textile wastewater in conventional advanced oxidation processes (AOPs). However, homogenous AOPs suffer from few limitations, including large consumption of chemicals, acidic pH, high cost of hydrogen peroxide, generation of iron sludge, and necessity of post-treatment. Therefore, recently, there have been more researches that focus on improving the performance of conventional AOPs using heterogeneous catalysts such as titanium dioxide, nanomaterials, metal oxides, zeolite, hematite, goethite, magnetite, and activated carbon (AC). Besides, different supports such as AC that have been incorporated with transition metals and clays have been proven to have excellent catalytic activity in AOPs. This paper presents a comprehensive review of advances and prospects of catalytic AOPs for the decontamination of a wide range of synthetic and real textile wastewater. This review provides an up-to-date critical review of the information on the degradation of various textile dyes by a wide range of heterogeneous catalysts and adsorbents. The future challenges of AOPs, including chemical consumption, toxicity assessment, reactor design, and limitation of catalysts, are discussed in this paper. In addition, this paper also discusses the presence of ions, generation of by-products, and industrial applications of AOPs. Special emphasis is given to recent studies and large-scale combination of AOPs for wastewater treatment. This review paper concludes that more studies are needed for the kinetics, reactor design, and modeling of hybrid AOPs and the production of their corresponding intermediate products and secondary pollutants. A better economic model should also be developed to predict the cost of AOPs, as the treatment cost varies with dyes and textile effluents.

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Section: Electrochemical Oxidationmentioning

confidence: 99%

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Buthiyappan

Raman

Daud

2016

Reviews in Chemical Engineering

243

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“…49 Therefore, the PbO 2 -0.5TiN electrode with higher proportion of O ad implied a stronger electrochemical oxidation capacity for organics, which could also account for the best performance for dye in this study. 2 electrodes, the leakage of Pb element etc. may exist in the electrolysis process which could cause the secondary pollution.…”

Section: Cyclic Voltammograms (Cv) and Electrochemical Impedance Specmentioning

confidence: 99%

“…As an attractive and promising wastewater treatment technology, electrochemical oxidation treatment (EOT) has been applied in many fields [1][2][3][4] due to its flexibility, simplicity, high efficiency, mild condition, and environmental compatibility. [5][6][7] Anode plays an important role in the electrochemical oxidation process.…”

mentioning

confidence: 99%

Fabrication and Characterization of a PbO₂-TiN Composite Electrode by Co-Deposition Method

Yan

2016

J. Electrochem. Soc.

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An excellent PbO 2 electrode with high electrocatalytic activity and stability was successfully fabricated by doping TiN particles through co-deposition method (marked as PbO 2 -TiN). The morphology (SEM), crystalline structure (XRD), chemical state (XPS), electrochemical performances (CV and EIS) and stability (accelerated life test) were characterized. The results showed that TiN doping could obviously improve the surface morphology of the electrode, increase the electrode current response and reduce the electrode impedance. During the electrochemical oxidation process, the PbO 2 -0.5TiN electrode showed the best performance on degradation of Acid Red G and Methylene blue (the highest removal efficiency, the lowest energy consumption and minimum Pb dissolution). The proportion of adsorbed hydroxyl oxygen for PbO 2 -0.5TiN electrode was 78.75%, which was higher than that for PbO 2 electrode (68.95%). The accelerated service lifetime of PbO 2 -0.5TiN electrode was 302 h, which was more than 3 times longer than that of PbO 2 electrode (96 h). Furthermore, a likely deactivation mechanism for lifetime enhancement of PbO 2 -0.5TiN electrode was proposed. As an attractive and promising wastewater treatment technology, electrochemical oxidation treatment (EOT) has been applied in many fields 1-4 due to its flexibility, simplicity, high efficiency, mild condition, and environmental compatibility. [5][6][7] Anode plays an important role in the electrochemical oxidation process.8 Therefore, anodes with a high catalytic activity and long service life are desired. 9,10Some of the traditional DSA electrodes, such as Ti/RuO 2 and Ti/IrO 2 with good stability exhibit little weak electrochemical oxidation ability for organics due to the low oxygen evolution potential (OEP) and the cost are high due to the noble metals 5,11 . In addition, Ti/Sb-SnO 2 has been the research focus for its high oxygen evolution potential (OEP) and strong electrochemical oxidation ability. However, the short service life of the Ti/Sb-SnO 2 affects the degradation rate of pollutants. 12,13 In contrast, Ti/PbO 2 is a more promising metal oxide electrode widely used in practice due to its low cost, ease of synthesis, high electrocatalytic activity and chemical stability 14,15 . However, the leakage of Pb element in the electrolysis process may lead to the secondary water pollution. 16 Besides, the catalytic performance of the Ti/PbO 2 electrode still has room for improvement. Thus, several efforts have been devoted to further improve its performance in the electrochemical oxidation capability and stability, including inserting the middle layer, 17 . Based on the reports above mentioned, it can be concluded that an appropriate modification can effectively improve the performances of the electrode.Titanium nitride (TiN) is a kind of novel functional materials possessing considerable excellent characteristics such as high chemical and thermal stability, good electric conductivity, corrosion resistance, wear resistance and low cost [32][33][34] . Therefor...

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“…Several studies have reported that more than 100,000 dyes are commercially available with an estimated annual production of over 7 × 10 5 -1 × 10 6 tons [1]. Industries that produce textiles, cosmetics, paper, leather, light-harvesting arrays, agricultural products, photoelectrochemical cells, pharmaceuticals, and food processing also produce large volumes of wastewater that are polluted with a high concentration of dyes and other components [2].…”

Section: Introductionmentioning

confidence: 99%

“…A combination of various techniques for the treatment of effluents can lead to higher removal efficiencies than a single treatment method. Electrocoagulation technology is a simple, reliable, costeffective, and promising technique for treating various wastewaters without additional chemicals and thus reducing the volume of produced sludge; this technology requires only a low-intensity electrical current and can therefore be operated using green processes, such as solar cells, windmills, and fuel cells [2]. The coagulating agent is generated in situ during the electrooxidation of a sacrificial anode; the hydroxide formed on the mineral surfaces in situ is 100 times higher than on preprecipitated hydroxides when metal hydroxides are used as the coagulant.…”

Section: Introductionmentioning

confidence: 99%

Electrocoagulation-Adsorption to Remove Anionic and Cationic Dyes from Aqueous Solution by PV-Energy

Castañeda-Díaz

Pavón-Silva

Gutiérrez-Segura

et al. 2017

Journal of Chemistry

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The cationic dye malachite green (MG) and the anionic dye Remazol yellow (RY) were removed from aqueous solutions using electrocoagulation-adsorption processes. Batch and continuous electrocoagulation procedures were performed and compared. Carbonaceous materials obtained from industrial sewage sludge and commercial activated carbons were used to adsorb dyes from aqueous solutions in column systems with a 96-98% removal efficiency. The continuous electrocoagulation-adsorption system was more efficient for removing dyes than electrocoagulation alone. The thermodynamic parameters suggested the feasibility of the process and indicated that the adsorption was spontaneous and endothermic (Δ = 0.037 and −0.009 for MG and RY, resp.). The Δ value further indicated that the adsorption process was spontaneous (−6.31 and −10.48; = 303 K). The kinetic electrocoagulation results and fixed-bed adsorption results were adequately described using a first-order model and a Bohart-Adams model, respectively. The adsorption capacities of the batch and column studies differed for each dye, and both adsorbent materials showed a high affinity for the cationic dye. Thus, the results presented in this work indicate that a continuous electrocoagulation-adsorption system can effectively remove this type of pollutant from water. The morphology and elements present in the sludge and adsorbents before and after dye adsorption were characterized using SEM-EDS and FT-IR.

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Decontamination of wastewaters containing synthetic organic dyes by electrochemical methods. An updated review

Cited by 1,892 publications

References 207 publications

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Fabrication and Characterization of a PbO₂-TiN Composite Electrode by Co-Deposition Method

Electrocoagulation-Adsorption to Remove Anionic and Cationic Dyes from Aqueous Solution by PV-Energy

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Decontamination of wastewaters containing synthetic organic dyes by electrochemical methods. An updated review

Cited by 1,892 publications

References 207 publications

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Fabrication and Characterization of a PbO2-TiN Composite Electrode by Co-Deposition Method

Electrocoagulation-Adsorption to Remove Anionic and Cationic Dyes from Aqueous Solution by PV-Energy

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Product

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Fabrication and Characterization of a PbO₂-TiN Composite Electrode by Co-Deposition Method