An overview on the photocatalytic degradation of azo dyes in the presence of TiO2 doped with selective transition metals

Dye aggregation and influence of pre-micelles on heterogeneous catalysis: A photophysical approach

“…Note that amount of titanium dioxide used in all experiments is extremely reduced (0.02 g/L) if compared with values reported in the literature [10][11][12][13][14]. The decrease in the photocatalyst concentration is associated with a strong reduction in the characteristic time for photodegradation, that is established from irradiation in the visible region.…”

“…This process is extremely dependent on coupling between titanium dioxide and rhodamine B. In this direction, the use of selective transition metals [14] acting as dopants of titanium dioxide introduces advantages in the photocatalytic process. The introduction of transition metals reduces the recombination of generated electrons and holes and decreases the band gap of semiconductor or similarly creates intraband gap states allowing the photocatalysis with irradiation of light in the visible region.…”

Estudo de oxidação avançada de corantes básicos via reação Fenton (Fe2+/H2O2)

“…As substâncias corantes provindas do setor têxtil contribuem significativamente para a poluição de ecossistemas hídricos devido à dificuldade imposta quanto à penetração dos raios solares, prejudicando o metabolismo fotossintético, além de serem compostos com caracterís-ticas de baixa biodegradabilidade e seus produtos secundários, como as aminas aromáticas, possuírem potencial carcinogênico (RAUF; MEETANI;HISAINDEE, 2011;NEAMTU et al, 2002). Desta forma, o desenvolvimento de tecnologias eficientes e baratas de tratamento constitui uma necessidade e consideráveis esforços de pesquisa estão sendo dedicados nesse campo (ZAZO et al, 2006).…”

Sonophotocatalytic degradation of Reactive Red 120 (RR120) in the presence of TiO2: Kinetic study

“…Thus, result in the release of secondary pollution into the environment. In addition, these treatment methods are ineffective for textile wastewater due to the large numbers of aromatic compounds present in dye molecules and stability of modern dye [3][4][5].…”

“…This set of techniques which are based on the generation of hydroxyl radicals ( OH) can be one of the promising approaches for the treatment of textile wastewater effluents [3][4]. Although individual AOPs seem useful to treat textile wastewater, however they are also demonstrates substantially lower efficiency of degradation and complete mineralization especially for the complex effluent streams.…”