Recent developments in MnO2-based photocatalysts for organic dye removal: a review

Chiam, Sin-Ling; Pung, Swee‐Yong; Yeoh, Fei-Yee

doi:10.1007/s11356-019-07568-8

Cited by 143 publications

(50 citation statements)

References 144 publications

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“…It has been noticed that KMnO4 modification with MnO2 (MnOx) shell can be comprising passages for the slow release of MnO4in aquatic systems [51]. The MnO2 NPs can simultaneously help in decomposing other water pollutants like H2O2, organic dyes, phenol, acetic acid, sulfosalicylic acid and so on [52][53][54]. However, the exact mechanism associated with the effect of metal ion catalysts for permanganate degradation is still under debated.…”

Section: Mn VII Ion Removal Using Esm Assisted Synthesized Cds Nanopamentioning

confidence: 99%

“…There are different treatment methods available for degradation of heptavalent manganese, which are precipitation methods, oxidation, filtration, ion exchange, coagulation/flocculation, membrane filtration, electrochemical methods, biological treatment and adsorption [30][31][32]. Photocatalytic degradation technique has been considered as a promising technology for heavy metal removal compared to other methods, in this process it utilizes sunlight or indoor illumination lights; furthermore, photocatalysis is the most economical method and high-efficiency environmental protection method even though it has some limitations [33,34]. The aim of this study lies in the synthesis of CdS NPs using ESM applying UVA light irradiation method and further application as an emerging redox catalyst for toxic Mn VII ion removal from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

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Eggshell Membrane Assisted CdS Nanoparticles for Manganese Removal in Water Treatment

2021

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Section: Mn VII Ion Removal Using Esm Assisted Synthesized Cds Nanopamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Eggshell Membrane Assisted CdS Nanoparticles for Manganese Removal in Water Treatment

2021

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“…In fact, manganese dioxide (MnO 2 ) is widely used as a catalyst or activator in various heterogeneous reaction systems due to its high natural abundance, low toxicity, and low environmental impacts [24][25][26]. MnO 2 is a promising candidate for photocatalyst application due to its narrow bandgap (1-2 eV) and ability to absorb light under solar energy [27]. However, to our best knowledge, synergistic use of MnO 2 and UV has never been applied for PS activation.…”

Section: Introductionmentioning

confidence: 99%

UV Stimulated Manganese Dioxide for the Persulfate Catalytic Degradation of Bisphenol A

et al. 2021

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One of the most commonly produced industrial chemicals worldwide, bisphenol A (BPA), is used as a precursor in plastics, resins, paints, and many other materials. It has been proved that BPA can cause long-term adverse effects on ecosystems and human health due to its toxicity as an endocrine disruptor. In this study, we developed an integrated MnO2/UV/persulfate (PS) process for use in BPA photocatalytic degradation from water and examined the reaction mechanisms, degradation pathways, and toxicity reduction. Comparative tests using MnO2, PS, UV, UV/MnO2, MnO2/PS, and UV/PS processes were conducted under the same conditions to investigate the mechanism of BPA catalytic degradation by the proposed MnO2/UV/PS process. The best performance was observed in the MnO2/UV/PS process in which BPA was completely removed in 30 min with a reduction rate of over 90% for total organic carbon after 2 h. This process also showed a stable removal efficiency with a large variation of pH levels (3.6 to 10.0). Kinetic analysis suggested that 1O2 and SO4•− played more critical roles than •OH for BPA degradation. Infrared spectra showed that UV irradiation could stimulate the generation of –OH groups on the MnO2 photocatalyst surface, facilitating the PS catalytic degradation of BPA in this process. The degradation pathways were further proposed in five steps, and thirteen intermediates were identified by gas chromatography-mass spectrometry. The acute toxicity was analyzed during the treatment, showing a slight increase (by 3.3%) in the first 30 min and then a decrease by four-fold over 2 h. These findings help elucidate the mechanism and pathways of BPA degradation and provide an effective PS catalytic strategy.

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“…In membrane separation, zero-waste generation is unfeasible, because this process produces effluents with a high concentration of the target pollutants [26]. Moreover, adsorption processes only transfer the pollutant to a new phase (solid waste), which needs further treatment [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Removal of Aniline and Benzothiazole Wastewaters Using an Efficient MnO2/GAC Catalyst in a Photocatalytic Fluidised Bed Reactor

et al. 2021

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This work presents an efficient method for treating industrial wastewater containing aniline and benzothiazole, which are refractory to conventional treatments. A combination of heterogeneous photocatalysis operating in a fluidised bed reactor is studied in order to increase mass transfer and reduce reaction times. This process uses a manganese dioxide catalyst supported on granular activated carbon with environmentally friendly characteristics. The manganese dioxide composite is prepared by hydrothermal synthesis on carbon Hydrodarco® 3000 with different active phase ratios. The support, the metal oxide, and the composite are characterised by performing Brunauer, Emmett, and Teller analysis, transmission electron microscopy, X-ray diffraction analysis, X-ray fluorescence analysis, UV–Vis spectroscopy by diffuse reflectance, and Fourier transform infrared spectroscopy in order to evaluate the influence of the metal oxide on the activated carbon. A composite of MnO2/GAC (3.78% in phase α-MnO2) is obtained, with a 9.4% increase in the specific surface of the initial GAC and a 12.79 nm crystal size. The effect of pH and catalyst load is studied. At a pH of 9.0 and a dose of 0.9 g L−1, a high degradation of aniline and benzothiazole is obtained, with an 81.63% TOC mineralisation in 64.8 min.

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Recent developments in MnO2-based photocatalysts for organic dye removal: a review

Cited by 143 publications

References 144 publications

Eggshell Membrane Assisted CdS Nanoparticles for Manganese Removal in Water Treatment

Eggshell Membrane Assisted CdS Nanoparticles for Manganese Removal in Water Treatment

UV Stimulated Manganese Dioxide for the Persulfate Catalytic Degradation of Bisphenol A

Removal of Aniline and Benzothiazole Wastewaters Using an Efficient MnO2/GAC Catalyst in a Photocatalytic Fluidised Bed Reactor

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