Microwave assisted photocatalytic degradation of high concentration azo dye Reactive Brilliant Red X-3B with microwave electrodeless lamp as light source

Zhang, Xiwang; Li, Guoting; Wang, Yizhong

doi:10.1016/j.dyepig.2006.03.012

Cited by 74 publications

(41 citation statements)

References 37 publications

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“…The absorbance features at 235, 285, and 332 nm represented benzene rings, triazine rings, and naphthalene rings, respectively [31][32][33]. Obvious declines of the three absorbance features shown in Figure 4A were observed in effluent with different external voltages when influent concentrations were 200 mg/L.…”

Section: Uv-vis Spectral Analysismentioning

confidence: 83%

Effects of Electrical Stimulation on the Degradation of Azo Dye in Three-Dimensional Biofilm Electrode Reactors

Chen

Wang

et al. 2017

Water

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Three-dimensional biofilm electrode reactors (3D-BERs) were constructed to degrade the azo dye Reactive Brilliant Red (RBR) X-3B. The 3D-BERs with different influent concentrations and external voltages were individually studied to investigate their influence on the removal of X-3B. Experimental results showed that 3D-BERs have good X-3B removal efficiency; even when the influent concentration was 800 mg/L, removal efficiency of 73.4% was still achieved. In addition, the X-3B removal efficiency stabilized shortly after the influent concentration increased. In 3D-BERs, the average X-3B removal efficiency increased from 52.8% to 85.4% when the external voltage rose from 0 to 2 V. We further identified the intermediate products via UV-Vis and gas chromatography-mass spectrometry (GC-MS) analyses, and discussed the potential mechanism of degradation. After the conjugate structure of X-3B was destroyed, all of the substances generated mainly consisted of lower-molecular-weight organics.

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Section: Uv-vis Spectral Analysismentioning

confidence: 83%

Effects of Electrical Stimulation on the Degradation of Azo Dye in Three-Dimensional Biofilm Electrode Reactors

Chen

Wang

et al. 2017

Water

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“…Zhang et al [3] showed that the UV-vis light and MW irradiation exhibited excellent capability for acid orange 7 decolorization and mineralization, and demonstrated the formation of oxidative species (e.g., O 2 À , OH, H 2 O 2 and O 3 ). Inorganic oxidizing species as O 2 , H 2 O 2 and Na 2 S 2 O 8 enhanced pollutants degradation in MW/UV systems under a suppression of thermal effect [4,5]. The introducing of photocatalysts as TiO 2 into MW system (TiO 2 /MW) exhibited much higher rate than MW irradiation alone and conventional photocatalysis for X-3B decolorization and TOC mineralization [5].…”

Section: Introductionmentioning

confidence: 99%

“…The degradation of dyes in MW systems was often approximated as pseudo-first-order kinetics as the following equation [5]:…”

Section: X-grl Degradation and Decolorizationmentioning

confidence: 99%

“…Inorganic oxidizing species as O 2 , H 2 O 2 and Na 2 S 2 O 8 enhanced pollutants degradation in MW/UV systems under a suppression of thermal effect [4,5]. The introducing of photocatalysts as TiO 2 into MW system (TiO 2 /MW) exhibited much higher rate than MW irradiation alone and conventional photocatalysis for X-3B decolorization and TOC mineralization [5]. The microwave electrodeless lamp (MWL) shows advantages as high photochemical efficiency, simple photocatalytic equipment and long life [6], and is chosen as light source in this study.…”

Section: Introductionmentioning

confidence: 99%

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Microwave electrodeless lamp assisted catalytic degradation of X-GRL with manganese dioxides: Adsorption and manganese(IV) reductive dissolution effects

et al. 2008

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“…14 Xiwang Zhang et al 15 also found that the coupled UV-Vis/microwave irradiation led to effective degradation of higher concentration dyes in TiO 2 /MDEL than in conventional photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted photocatalytic degradation of dimethyl phthalate using a microwave discharged electrodeless lamp

Liao¹,

Wang²

2009

J. Braz. Chem. Soc.

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O processo de fotodegradação catalítica assistido por radiação microondas do dimetilftalato foi investigado usando uma lâmpada de descarga sem eletrodos como fonte de radiação ultravioleta (UV). O dimetilftalato pode ser degradado rápida e completamente pelo processo. Os efeitos da dosagem fotocatalítica, intensidade de radiação UV, pH inicial e concentração de dimetilftalato, bem como o tempo de irradiação foram detalhamente estudados. Efeitos sinergéticos ocorreram entre a irradiação de microondas e a fotocatálise do TiO 2 , e a maior eficiência do processo pode ser associada aos efeitos não térmicos da irradiação de microondas. Dados experimentais evidenciaram que a irradiação por microondas pode causar significativa geração de radicais hidroxila. Os intermediários formados em maior concentração foram éster monometílico do ácido ftálico, ácido ftálico, o-fenil dietil cetona e anidrido o-ftálico. Com base nos dados experimentais, duas rotas de degradação inicial do dimetilftalato foram propostas.The microwave-assisted photocatalytic degradation (MW/PC) of dimethyl phthalate (DMP) was investigated, using a microwave discharged electrodeless lamp (MDEL) as the UV source. DMP could be rapidly and completely degraded by the MW/PC process. The effects of photocatalyst dosage, UV light intensity, initial pH and concentration of DMP, as well as irradiation time, were studied in detail. Synergistic effects were found to exist between microwave irradiation and TiO 2 photocatalysis, and the greater efficiency of the MW/PC process might be ascribed to nonthermal effects of microwave irradiation. Detection results confirmed that microwave irradiation could give rise to the generation of hydroxyl radicals. The major intermediates of DMP in the MW/PC process were deduced to be phthalic acid monomethyl ester, phthalic acid, o-phenyl diethyl ketone and o-phthalic anhydride. Based on the results, two initial degradation pathways of DMP were proposed.

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Microwave assisted photocatalytic degradation of high concentration azo dye Reactive Brilliant Red X-3B with microwave electrodeless lamp as light source

Cited by 74 publications

References 37 publications

Effects of Electrical Stimulation on the Degradation of Azo Dye in Three-Dimensional Biofilm Electrode Reactors

Effects of Electrical Stimulation on the Degradation of Azo Dye in Three-Dimensional Biofilm Electrode Reactors

Microwave electrodeless lamp assisted catalytic degradation of X-GRL with manganese dioxides: Adsorption and manganese(IV) reductive dissolution effects

Microwave-assisted photocatalytic degradation of dimethyl phthalate using a microwave discharged electrodeless lamp

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