Behavior of bromide in the photoelectrocatalytic process and bromine generation using nanoporous titanium dioxide thin-film electrodes

Selçuk, Hüseyin; Sene, Jeosadaque J.; Zanoni, María Valnice Boldrin; Sarikaya, H. Z.; Anderson, Marc A.

doi:10.1016/j.chemosphere.2003.09.016

Cited by 31 publications

(20 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…At higher concentrations of these ions (≥0.10 mol L −1 ), the stability of the TiO 2 electrode was compromised and dissolved Ti in solution could be detected. In addition, as discussed previously [49], bromide interferes directly with this process, since bromine can also be generated due to the similarity in chemistry between chlorine and bromine. But, bromine could be used as disinfecting agent, too [49].…”

Section: Interference On the Chloride Generationmentioning

confidence: 94%

Evaluation of the photoelectrocatalytic method for oxidizing chloride and simultaneous removal of microcystin toxins in surface waters

Fraga

Anderson

Beatriz

et al. 2009

Electrochimica Acta

Self Cite

View full text Add to dashboard Cite

Section: Interference On the Chloride Generationmentioning

confidence: 94%

Evaluation of the photoelectrocatalytic method for oxidizing chloride and simultaneous removal of microcystin toxins in surface waters

Fraga

Anderson

Beatriz

et al. 2009

Electrochimica Acta

Self Cite

View full text Add to dashboard Cite

“…In dealing with BDD anodes, Ferro concluded that bromide oxidation is mass transfer-controlled [28]. Selcuk, on the other hand, studied bromate formation in photocatalysis [29]. This paper is aimed at demonstrating bromate and perbromate formation on BDD in bromide electrolysis.…”

Section: Introductionmentioning

confidence: 96%

The occurrence of bromate and perbromate on BDD anodes during electrolysis of aqueous systems containing bromide: first systematic experimental studies

2011

View full text Add to dashboard Cite

Bromide electrolysis was carried out on laboratory-scale cells in the range of 1-1,005 mg [Br -] dm -3 using boron-doped diamond (BDD) anodes. These studies were part of fundamental research activities on drinking water electrolysis for disinfection. Synthetic water systems were mostly used in the experiments, which varied the temperature between 5 and 30°C, the current density between 50 and 700 A m -2 , and the rotation rate of the rotating anode between 100 and 500 rpm (laminar regime). Hypobromite and bromate were found as by-products, as expected. Bromite was not detected. Higher bromate levels were formed at higher current density, but no clear relationship was observed between bromate concentration and the rotation rate or temperatures between 5 and 30°C. Bromate yields higher than 90% were found at higher charge passed. Perbromate was found as a new potential synthesis or disinfection by-product (DBP), but no perbromate was detected at the lowest bromide concentrations and under drinking water conditions. The perbromate yield was about 1%, and somewhat lower when bromate was used as a starting material instead of bromide. At a temperature of 5°C more perbromate was detected compared with experiments at 20°. Approximately 20 times more perchlorate was formed compared with perbromate formation in the presence of chloride ions of equimolar concentration. State of mechanistic considerations is presented and a mechanism for perbromate formation is proposed. The reaction from bromate to perbromate was found to be limited that is in contrast to the earlier studied chlorate-to-perchlorate conversion. In the measured concentration range, reduction processes at the mixed oxide cathode showed a much higher impact on the resulting concentration for perbromate than for bromate. Keywords Electrochemical disinfection Á Drinking water Á Bromide electrolysis Á Bromate Á Perbromate Á BDD Á Disinfection by-products List of symbols BDD Boron Doped Diamond c Concentration (mg dm -3 ) D Diffusion coefficient (m 2 s -1 ) DPD Diphenylendiamine E Electrode potential (V (SHE)) F FARADAY constant (As mol -1 ) I Current (A) IC Ion chromatography i lim Limiting current density (A m -2 ) k Reaction rate constant (M -1 s -1 , M -2 s -2 ) n Number of electrons transferred M Molar mass (mg mol -1 ) r Electrode radius (m) Re = xÁr 2 /m Reynolds number RDE Rotating disk electrode RNO p-Nitrosodimethylaniline rpm Revolutions per minute Sc = m/D Schmidt number Sh = bÁr/D Sherwood number SHE Standard Hydrogen Electrode

show abstract

“…6 A preocupação com rejeitos contendo essa classe de corantes tem crescido nos anos mais recentes, devido a suas comprovadas propriedades mutagênicas. [8][9][10][11][12][13][14][15][16][17] Os métodos de tratamento para corantes dispersos baseados em processos biológicos, físico-químicos e utilização de ozônio têm sido inadequados para sua remoção. [18][19][20] Métodos de descoloração de corantes dispersos baseados em processos fotoquímicos têm alcançado apenas 55% de eficiência.…”

Section: Introductionunclassified

“…Este método tem sido utilizado com sucesso para a degradação de vários compostos orgânicos. [13][14][15][16][17] Neste trabalho estudou-se a oxidação fotoeletrocatalítica de um efluente coletado de uma indústria têxtil usando eletrodos de Ti/TiO 2 preparados pelo método sol-gel, sob irradiação UV. O método foi ainda testado para os corantes usados na composição do banho de tintura no mesmo dia em que o efluente foi coletado.…”

Section: Introductionunclassified

“…Quatro ciclos adicionais foram completados e o eletrodo estava pronto para ser usado, de acordo com o procedimento descrito anteriormente. [13][14][15][16] instrumentação e procedimento de análise Os experimentos de fotoeletrocatálise foram realizados em um reator com capacidade para 250 mL. Na célula foi posicionado o eletrodo de trabalho, um eletrodo auxiliar e como referência o eletrodo de Ag/AgCl imerso em um capilar de Luggin.…”

Section: Introductionunclassified

See 1 more Smart Citation

Degradação fotoeletroquímica de corantes dispersos em efluente têxtil utilizando fotoanodos de Ti/TiO2

Brunelli¹,

Guaraldo²,

Paschoal³

et al. 2009

Quím. Nova

Self Cite

View full text Add to dashboard Cite

The degradation of disperses dyes in aqueous solution and in effluents from textile industry has been investigated by photoelectrocatalytic oxidation using nanoporous thin films electrodes of Ti/TiO 2 . Samples of dispersil black dye and dispersil blue dye after 300 min of photoelectrolyzed at applied potential of +1.0 V and UV irradiation exhibited 100% of discoloration and 90% and 64% reduction total organic carbon, respectively. The proposed method was applied with success in a textile industry effluent containing residues of these dyes, which after 300 min of treatment leads to reduction of 60% of COD and 64% removal of TOC.

show abstract

Behavior of bromide in the photoelectrocatalytic process and bromine generation using nanoporous titanium dioxide thin-film electrodes

Cited by 31 publications

References 19 publications

Evaluation of the photoelectrocatalytic method for oxidizing chloride and simultaneous removal of microcystin toxins in surface waters

Evaluation of the photoelectrocatalytic method for oxidizing chloride and simultaneous removal of microcystin toxins in surface waters

The occurrence of bromate and perbromate on BDD anodes during electrolysis of aqueous systems containing bromide: first systematic experimental studies

Degradação fotoeletroquímica de corantes dispersos em efluente têxtil utilizando fotoanodos de Ti/TiO2

Contact Info

Product

Resources

About