Photocatalytic decolorization of soluble dyes by a bis-ions coexistence system of NH4+ and NO3− with high photoreduction ability

Chen, Shifu; Liu, Wei; Zhang, Huaye; Yu, Xin

doi:10.1016/j.jhazmat.2010.12.052

Cited by 15 publications

(6 citation statements)

References 26 publications

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“…ZnO is widely used photocatalyst because of its low cost, its high surface reactivity with many active sites, and its nature of absorbing a larger fraction of the UV spectrum than other photocatalysts. However, it has several problems such as fast recombination of electron/hole pairs because of a large E g (3.37 eV), a low quantum yield in the photocatalytic reactions in aqueous solutions, − poor utilization of the visible light spectrum, and photoinstability because of photocorrosion under UV light and visible light . In order to avoid these problems doping of transition metal ions, having ionic radii similar to that of zinc, is done on the photocatalyst so that the transition metal can easily penetrate into the crystal lattice of ZnO.…”

Section: Resultsmentioning

confidence: 99%

“…The intensity of maximum absorbance peak of dye decreased with treatment time. This may be due to breaking of the chromophore (NN) of the dye during photocatalytic oxidation of the dye. , …”

Section: Resultsmentioning

confidence: 99%

“…This may be due to breaking of the chromophore (NN) of the dye during photocatalytic oxidation of the dye. 43,61 It is found that the degradation reaction of acid red 1 dye basically obeys the pseudo-first-order reaction kinetics with an R 2 (goodness of fit) value of 0.98. The pseudo-first-order rate constant (k) was calculated from the plot of the natural logarithm of the dye concentration as a function of irradiation time.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 96%

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Photocatalytic Oxidation of Dye Bearing Wastewater by Iron Doped Zinc Oxide

Choudhary

Srivastava

2013

Ind. Eng. Chem. Res.

120

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In the present study, photocatalytic oxidation of dye bearing wastewater has been done using iron doped zinc oxide (Fe/ZnO) photocatalyst. Various photocatalysts were synthesized by solution combustion synthesis method, and their structural, morphological, and optical properties were studied using N2 adsorption–desorption, Fourier transform infrared spectroscopy, X-ray diffractometer, thermogravimetric analysis, field emission scanning electron microscope, transition electron microscope, and UV–visible diffuse reflectance spectra. Effect of various parameters such as the amount of iron doped, calcination temperature, calcination time, pH of the dye solution, catalyst dose, hydrogen peroxide dose, reaction temperature, and initial concentration of the dye solution were optimized. At optimum conditions, more that 71% color removal, 94% dye degradation, and 41% total organic carbon removal was observed for acid red 1 dye solution having an initial concentration of 50 mg/L and initial color of 2730 Pt:Co units.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 96%

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Photocatalytic Oxidation of Dye Bearing Wastewater by Iron Doped Zinc Oxide

Choudhary

Srivastava

2013

Ind. Eng. Chem. Res.

120

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“…This was due to the breakdown of dye molecules' conjugated chromophore structure caused by visible light, leading to the total decomposition of dye molecules into ions and small molecules. 50 Although an effort was made, the maximum R D for CR and TC were only 79.05 and 82.09%, respectively. Furthermore, the results of TOC test illustrated that the CR, CV, MeB, and TC experienced the degradation by 78.89, 91.12, 93.38, and 80.94% respectively (Figure S3e), indicating the successful mineralization of pollutants.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Photocatalytic PAN Nanofibrous Membrane through Anchoring a Nanoflower-Branched CoAl-LDH@PANI Heterojunction for Organic Hazards Degradation and Oil-Containing Emulsified Wastewater Separation

Zhu,

Zhan,

Chen

et al. 2024

Langmuir

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The synergistic treatment of oily wastewater containing organic hazards and emulsified oils remains a big challenge for membrane separation technology. Herein, the photocatalytic membrane, which combined the physical barrier and catalytic oxidation-driven degradation functionality, was fabricated via anchoring a nanoflower-branched CoAl-LDH@ PANI Z-scheme heterojunction onto a porous polyacrylonitrile mat and using tannic acid as an adhesive. The assembly of such a Z-scheme heterojunction offered the superior photocatalytic degradation performance of soluble dyes and tetracycline (up to 94.3%) to the membrane with the improved photocatalytic activity of 2.33 times compared with the CoAl-LDH@pPAN membrane. Quenching experiments suggested that the • O 2 − was the most reactive oxygen species in the catalytic reaction system of the composite membrane. The greatly enhanced photocatalytic activity was attributed to the effective inhibition of photogenerated hole− electron combination using PANI as a carrier, with charge transferring from LDH to PANI. The possible photocatalytic degradation mechanism was proposed based on VB-XPS, electron spin resonance spectroscopy, and DRS technologies, which was confirmed by density functional theory calculation. Meanwhile, benefiting from the superhydrophilic/oleophobic feature and low oil adhesion, the membrane exhibited high permeability for isooctane emulsion (3990.39 L•m −2 •h −1 ), high structure stability, and satisfactory cycling performance. This work provided a strategy to develop superwetting and photocatalytic composite membranes for treating complex multicomponent pollutants in the chemical industry.

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“…To understand the free radicals involved in the photocatalytic reaction mechanism, a free-radical scavenger was added to the reaction to measure the active species in the reaction. AO, SA, benzoquinone (BQ), and isopropanol (IPA) were employed as the scavengers for the holes (h + ) [34], singlet oxygen ( 1 O 2 ) [35], oxygen radical ( • O 2 − ) [36], and hydroxyl radical ( • OH) [37], respectively.…”

Section: Mechanisms Of Rhb Photodegradation and Co 2 Photoreductionmentioning

confidence: 99%

Perovskite-Like Strontium Bismuth Oxyhalides: Synthesis, Characterisation, Photocatalytic Activity and Degradation Mechanism

Lin

Liu

et al. 2023

Catalysts

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Recent studies have demonstrated that bismuth oxyhalides with a 2D structure inhibit the recombination of electron–hole pairs. Further, perovskite-like strontium bismuth-based compounds with a special layered Sillen X1 structure have shown potential for use as effective visible-light photocatalysts. Here, a series of strontium bismuth oxyhalide composites were prepared under different calcination conditions. The sample compositions were controlled by modulating the calcination temperature and the secondary calcination time. The synthesised catalysts were characterised by various techniques to identify the product compositions. Under visible-light irradiation, the degradation efficiencies and photocatalytic activities of the different catalysts towards rhodamine B (RhB) and 2-hydroxybenzoic acid (2-HBA) were measured via UV–Vis PDA and electron paramagnetic resonance analyses. To explore the degradation mechanism, scavengers were utilised to detect the radicals produced in the photodegradation test. SrBiO2Cl exhibited the best RhB degradation efficiency, of 0.0685 h−1, and SrBiO2Br exhibited a rate of 0.0984 h−1. At 25 °C and 1 atm, the CO2–CH4 photocatalytic conversion efficiencies of the optimised SrBiO2Cl and SrBiO2Br samples increased to 0.037 and 0.053 μmol g−1 h−1, respectively. The findings confirm that the catalysts are highly recyclable and effective for environmental remediation, achieving the objectives of green chemistry.

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Photocatalytic decolorization of soluble dyes by a bis-ions coexistence system of NH4+ and NO3− with high photoreduction ability

Cited by 15 publications

References 26 publications

Photocatalytic Oxidation of Dye Bearing Wastewater by Iron Doped Zinc Oxide

Photocatalytic Oxidation of Dye Bearing Wastewater by Iron Doped Zinc Oxide

Photocatalytic PAN Nanofibrous Membrane through Anchoring a Nanoflower-Branched CoAl-LDH@PANI Heterojunction for Organic Hazards Degradation and Oil-Containing Emulsified Wastewater Separation

Perovskite-Like Strontium Bismuth Oxyhalides: Synthesis, Characterisation, Photocatalytic Activity and Degradation Mechanism

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