Photocatalytic activity of G-TiO2@Fe3O4 with persulfate for degradation of alizarin red S under visible light

Rao, Yandi; Zhang, Yuxin; Li, Aoqi; Zhang, Tianhu; Jiao, Tifeng

doi:10.1016/j.chemosphere.2020.129236

Cited by 32 publications

(12 citation statements)

References 55 publications

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“…The combination of different oxides has been explored by several authors as a strategy to extend the range of photocatalytic activation to larger wavelengths. In particular, different iron oxides associated to titanium dioxide have shown enhanced photocatalytic performance [43,44] as well as good stability [45,46]. In this work, we presented a new onestep electrospinning process based on the synergetic effect of combining iron oxide (Fe 2 O 3 ) and titanium dioxide (TiO 2 ) into an insoluble polymeric electrospun supporting matrix.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Photocatalytic Activity and Anticorrosion Performance of Electrospun Fibers Doped with Metallic Oxides

et al. 2021

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This paper reports the development and characterization of a multifunctional coating that combines anticorrosion and photocatalytic properties, deposited by means of the electrospinning technique. In the first step, a functional electrospun fiber mat composed of poly(acrylic acid) (PAA) and β-cyclodextrin (β-CD) was obtained, showing high water insolubility and great adhesion increased by means of a thermal crosslinking process (denoted as PAA + β-CD). In the second step, the fibers were doped with particles of titanium dioxide (denoted as PAA + β-CD/TiO2) and titanium dioxide plus iron oxide (denoted as PAA + β-CD/TiO2/Fe2O3). The morphology and fiber diameter of the electrospun mats were evaluated by using confocal microscopy, whereas the presence of the metal oxides in the electrospun fibers was corroborated by scanning electron microscopy (SEM) and X-ray fluorescence (XRF), respectively. In addition, electrochemical tests in saline solution revealed that the sample composed of PAA + β-CD/TiO2/Fe2O3 showed the highest corrosion protection efficiency of all the samples, which was directly associated to lower corrosion current density and higher corrosion potential. Furthermore, the paper reports a novel approach to in situ determination of methylene blue (MB) degradation onto the coating. The results revealed complete degradation of MB, which is perfectly appreciated by total discoloration of the film in the irradiated zone (from bluish to a white spot). The main conclusions of this research are the efficiency of the electrospun system PAA + β-CD/TiO2/Fe2O3 for developing photocatalytic activity and corrosion protection and the utility of the dry MB discoloration tests to evaluate photocatalytic activity.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Photocatalytic Activity and Anticorrosion Performance of Electrospun Fibers Doped with Metallic Oxides

et al. 2021

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“…Overall, the AR decolorization rate was 70% [ 19 ]. The composite photocatalyst G-TiO 2 @Fe 3 O 4 achieved 100% AR S to 100% at 60 min [ 20 ]. The active carbon fibers were degraded using the electrochemical oxidation method.…”

Section: Discussionmentioning

confidence: 99%

The mechanism of degradation of alizarin red by a white-rot fungus Trametes gibbosa

Zhang

Chi

2021

BMC Biotechnol

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Background Alizarin red (AR) is a typical anthraquinone dye, and the resulting wastewater is toxic and difficult to remove. A study showed that the white rot fungus Trametes gibbosa (T. gibbosa) can degrade dye wastewater by decolorization and has its own enzyme-producing traits. Methods In this study, transcriptome sequencing was performed after alizarin red treatment for 0, 3, 7, 10, and 14 h. The key pathways and key enzymes involved in alizarin red degradation were found to be through the analysis of KEGG and GO. The Glutathione S-transferase (GST), manganese peroxidase (MnP) and laccase activities of T. gibbosa treated with alizarin red for 0–14 h were detected. LC–MS and GC–MS analyses of alizarin red decomposition products after 7 h and 14 h were performed. Results The glutathione metabolic pathway ko00480, and the key enzymes GST, MnP, laccase and CYP450 were selected. Most of the genes encoding these enzymes were upregulated under alizarin red conditions. The GST activity increased 1.8 times from 117.55 U/mg prot at 0 h to 217.03 U/mg prot at 14 h. The MnP activity increased 2.9 times from 6.45 to 18.55 U/L. The laccase activity increased 3.7 times from 7.22 to 27.28 U/L. Analysis of the alizarin red decolourization rate showed that the decolourization rate at 14 h reached 20.21%. The main degradation intermediates were found to be 1,4-butene diacid, phthalic acid, 1,1-diphenylethylene, 9,10-dihydroanthracene, 1,2-naphthalene dicarboxylic acid, bisphenol, benzophenol-5,2-butene, acrylaldehyde, and 1-butylene, and the degradation process of AR was inferred. Overall, 1,4-butene diacid is the most important intermediate product produced by AR degradation. Conclusions The glutathione metabolic pathway was the key pathway for AR degradation. GST, MnP, laccase and CYP450 were the key enzymes for AR degradation. 1,4-butene diacid is the most important intermediate product. This study explored the process of AR biodegradation at the molecular and biochemical levels and provided a theoretical basis for its application in practical production.

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“…Table 1 below shows the kinetic constants of the system, k op = k FC + k FQ and k FQ , obtained for each experiment and determined by non-linear regression fitting of the substrate concentration versus time data to the model defined in Equations (10) and (11), as well as the values of the photolytic (k FQ ) and photocatalytic (k FC ) constants calculated from the aforementioned approximations. Table 1 below shows the kinetic constants of the system, kop = kFC + kFQ and kFQ, obtained for each experiment and determined by non-linear regression fitting of the substrate concentration versus time data to the model defined in Equations ( 10) and (11), as well as the values of the photolytic (kFQ) and photocatalytic (kFC) constants calculated from the aforementioned approximations.…”

Section: Kinetic Study Of the Influence Of Catalyst Surface On The Degradation Of Pollutantmentioning

confidence: 99%

“…Fe 3 O 4 , ZnO, CdS, ZnS, SrTiO 3 , WSe 2 and TiO 2 (rutile or anatase)). These are characterized by a filled valence band and an empty conduction band [8][9][10][11]. Over the past decades, TiO 2 has been widely used to treat water pollutants due to its low cost, good stability, and high photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Study of Influence Factors in the Evaluation of the Performance of a Photocatalytic Fibre Reactor (TiO2/SiO2) for the Removal of Organic Pollutants from Water

et al. 2022

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The performance of a photocatalytic fibre reactor (UBE Chemical Europe), made of cartridges of fine particles of TiO2 dispersed within silicon fibres and irradiated by ultraviolet light, for the removal of organic pollutants from synthetic waters was evaluated. In the sensitivity analysis carried out, the factors catalytic surface area, fibre state, temperature and initial substrate concentration were studied using 4-chlorophenol as a test compound. The percentage of titanium in the fibre remained practically invariable after a series of experiments and cleaning procedures. Furthermore, the kinetics of removal of pyrene, phenol, 4-chlorophenol and bisphenol A (BPA) from water were evaluated by means of HPLC, UV-absorption and fluorescence techniques. Kinetic operational parameters were determined from a mathematical model proposed by Langmuir–Hinshelwood. Results show that catalytic surface, initial substrate concentration and temperature directly affect the degradation rate of organic compounds, whereas fibre state does not have a significant effect on that. It is proposed that removal of organic compounds from water mainly depends on the adsorption of the specific pollutant on the photocatalytic fibre and on the physical diffusion of the substrate towards the photocatalytic TiO2 active sites on the fibre, with the heterogeneous phase reaction prevailing over the homogeneous phase reaction.

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Photocatalytic activity of G-TiO2@Fe3O4 with persulfate for degradation of alizarin red S under visible light

Cited by 32 publications

References 55 publications

Evaluation of the Photocatalytic Activity and Anticorrosion Performance of Electrospun Fibers Doped with Metallic Oxides

Evaluation of the Photocatalytic Activity and Anticorrosion Performance of Electrospun Fibers Doped with Metallic Oxides

The mechanism of degradation of alizarin red by a white-rot fungus Trametes gibbosa

Study of Influence Factors in the Evaluation of the Performance of a Photocatalytic Fibre Reactor (TiO2/SiO2) for the Removal of Organic Pollutants from Water

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