Comparative use of anodic oxidation, electro-Fenton and photoelectro-Fenton with Pt or boron-doped diamond anode to decolorize and mineralize Malachite Green oxalate dye

El-Ghenymy, Abdellatif; Centellas, Francesc; Rodrı́guez, Rosa Marı́a; Cabot, Pere Lluı́s; Garrido, José Antonio; Sirés, Ignasi; Brillas, Enric

doi:10.1016/j.electacta.2015.09.078

Cited by 64 publications

(27 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This method is very effective when a small quantity of Fe 2+ (<1 mM) is added to the effluent to react with H 2 O 2 yielding Fe 3+ and • OH from Fenton's Reaction (5) at optimum pH ca. 3 (El-Ghenymy et al, 2015;Thiam et al, 2015Thiam et al, , 2016). • OH is a very strong oxidant with ability to mineralize most organics (Sirés et al, 2014).…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

“…Additionally, in an undivided cell at high current, organics and microorganisms are also destroyed by physisorbed hydroxyl radical M( • OH) produced from water oxidation at the surface of a large O 2 -overvoltage anode M such as boron-doped diamond (BDD) by Reaction (6). BDD thin-film electrodes are the best anodes for EF due to the high activity of BDD( • OH) (El-Ghenymy et al, 2015;Bruguera-Casamada et al, 2016, 2017.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

“…The cell was equipped with a 3 cm 2 BDD thin-film electrode over Si substrate from NeoCoat (Le-Chaux-de-Fonds, Switzerland) and a 3 cm 2 carbon-PTFE air-diffusion electrode from Sainergy Fuel Cell (Chenai, India), separated about 1 cm. The cathode was mounted as described elsewhere (El-Ghenymy et al, 2015) and was fed with air flowing at 1 L min −1 to produce H 2 O 2 . A j = 333 A m −2 was employed for all the EF runs.…”

Section: Electrochemical Systemsmentioning

confidence: 99%

See 2 more Smart Citations

Inactivation of microbiota from urban wastewater by single and sequential electrocoagulation and electro-Fenton treatments

et al. 2017

Self Cite

View full text Add to dashboard Cite

This work aims at comparing the ability of two kinds of electrochemical technologies, namely electrocoagulation (EC) and electro-Fenton (EF), to disinfect primary and secondary effluents from municipal wastewater treatment plants. Heterotrophic bacteria, Escherichia coli, enterococci, Clostridium perfringens spores, somatic coliphages and eukaryotes (amoebae, flagellates, ciliates and metazoa) were tested as indicator microorganisms. EC with an Fe/Fe cell at 200 A m and natural pH allowed >5 log unit removal of E. coli and final concentration below 1 bacteria mL of coliphages and eukaryotes from both effluents in ca. 60 min, whereas heterotrophic bacteria, enterococci and spores were more resistant. A larger removal was obtained for the primary effluent, probably because the flocs remove higher amount of total organic carbon (TOC), entrapping more easily the microbiota. EF with a boron-doped diamond (BDD) anode and an air-diffusion cathode that produces HO on site was first performed at pH 3.0, with large or even total inactivation of microorganisms within 30 min. A more effective microorganism removal was attained as compared to EC thanks to OH formed from Fenton's reaction. A quicker disinfection was observed for the secondary effluent owing to its lower TOC content, allowing the attack of greater quantities of electrogenerated oxidants on microorganisms. Wastewater disinfection by EF was also feasible at natural pH (∼7), showing similar abatement of active microorganisms as a result of the synergistic action of generated oxidants like active chlorine and coagulation with iron hydroxides. A sequential EC/EF treatment (30 min each) was more effective for a combined decontamination and disinfection of urban wastewater.

show abstract

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

Section: Electrochemical Systemsmentioning

confidence: 99%

See 1 more Smart Citation

Inactivation of microbiota from urban wastewater by single and sequential electrocoagulation and electro-Fenton treatments

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…Among those methods, the electrochemical one is the choice when adequate levels of dissolved organic load [9] and conductivity are present in the effluent. The main drawback of electrochemical technology is the use of electrical energy; however, the efficiency of organic compound removal to the electrical energy consumed can be optimized by the choice of adequate electrode materials [10], as well as the combination with another treatment method [11]. Among the available electrode materials, boron-doped diamond has been extensively used to detect many different kinds of organic compounds [12] and treat effluents contaminated with SOC [13], due to the quasi free hydroxyl radicals (HO • ) produced from water discharge [14]; however, there are some operational problems associated with this anode, such as the BDD film stability during electrooxidation in the presence of chloride ions (Cl − ) [15,16].…”

Section: Introductionmentioning

confidence: 99%

On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA® anode and UVC light: A mechanistic study

Montes

Silva²,

Aquino

2017

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

A hybrid electrochemical and photochemical (HEP) process was used to oxidize and mineralize the herbicide tebuthiuron (TBT), which is a potential contaminant of ground water, using a DSA ® anode and UVC light. The electrochemical and photochemical experiments were carried out in flow reactors and the investigated variables were: i) power of the Hg lamp (5, 9, 80, and 125 W), ii) solution pH (3, 7, 11, and no control), iii) NaCl concentration (0, 1, 2, and 4 g L −1), and iv) electric current density (10, 20, and 30 mA cm −2). The performance of the oxidation and mineralization process of TBT and its intermediates was assessed by high performance liquid chromatography coupled to mass spectrometry and total organic carbon analyses. The use of a 9 W Hg lamp led to complete oxidation and mineralization of TBT, and its intermediate compounds, from acidic to neutral solutions, independently of the applied electric current density, and with increasing NaCl concentration. High CO 2 conversions were obtained using the HEP process, as the generated intermediates (including an organochlorine) were completely eliminated. TBT removal rates similar to those of an electrochemical experiment using a boron-doped diamond anode were attained using the HEP process, but with higher energy consumption; however, chlorinated carboxylic acids were no longer present in the final treatment stages. The HEP process could be regarded as an advanced oxidation process, being an interesting option to treat effluents contaminated with organics if a proper optimization of the UVC lamp is done.

show abstract

“…As pointed out by Kapalka et al [16], BDD is an ideal anode material for the mineralization of organics; thus, it is being widely used nowadays in direct electrooxidation [10,[17][18][19][20] and in combined treatment methods such as electro-Fenton [21][22][23], solar electro-Fenton [22], or sonoelectrochemical [24], as well as in the electrochemical detection [25][26][27], of distinct classes of organic substances. High mineralization rates and current efficiencies are attained with BDD anodes due to properties such as large electrochemical window and good corrosion stability [28], as well as the presence of quasi-free hydroxyl radicals on their surfaces [16,29].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical mineralization of norfloxacin using distinct boron-doped diamond anodes in a filter-press reactor, with investigations of toxicity and oxidation by-products

Coledam

Aquino

Silva³

et al. 2016

Electrochimica Acta

View full text Add to dashboard Cite

The contamination of water bodies by antibiotics is a cause of concern due to chronic toxic effects and the possible development of resistance to them by microorganisms, which can lead to serious health problems to humans. Thus, in this work, for the first time the degradation of norfloxacin (100 mg L À1 NOR in 0.1 mol L À1 Na 2 SO 4) is carried out electrochemically, using a filter-press flow reactor with boron-doped diamond (BDD) anodes of distinct characteristics. The investigated variables (and their ranges) were solution pH (3, 7, 10, and without specific control), current density (10, 20, and 30 mA cm À2), temperature (10, 25, and 40 C), and boron content-sp 2 /sp 3 carbon ratio of the BDD anode (100 ppm-215, 500 ppm-325, and 2500 ppm-284). The NOR electrodegradation performance of the distinct anodes was assessed by monitoring the degradation by-products (aromatic compounds and carboxylic acids), NOR concentration and total organic carbon concentration of the electrolyzed solutions, as well as their toxicity to Escherichia coli (i.e. growth inhibition). For the complete removal of NOR, the best condition (not pH dependent) was attained at 10 mA cm À2 and 40 C, when the system is under mass transfer limitations. Concerning NOR oxidation and mineralization rates, mineralization current efficiency, energy consumption, and degradation products, similar results (including the complete detoxification of the electrolyzed solution) were attained for all tested BDD anodes under mass or charge transfer controlled processes. Clearly, the oxidation power of the tested BDD anodes is not affected by the values of their boron content-sp 2 /sp 3 carbon ratio.

show abstract

Comparative use of anodic oxidation, electro-Fenton and photoelectro-Fenton with Pt or boron-doped diamond anode to decolorize and mineralize Malachite Green oxalate dye

Cited by 64 publications

References 46 publications

Inactivation of microbiota from urban wastewater by single and sequential electrocoagulation and electro-Fenton treatments

Inactivation of microbiota from urban wastewater by single and sequential electrocoagulation and electro-Fenton treatments

On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA® anode and UVC light: A mechanistic study

Electrochemical mineralization of norfloxacin using distinct boron-doped diamond anodes in a filter-press reactor, with investigations of toxicity and oxidation by-products

Contact Info

Product

Resources

About