Cr/S/TiO2-loaded hollow glass microspheres as an efficient and recyclable catalyst for the photocatalytic degradation of indigo carmine under visible light

Zhang, Xiuli; Yin, Yidong; Sun, Zhibo; Du, Yingqiu; Ma, Shichao; Wu, Yan

doi:10.21577/0100-4042.20160121

Cited by 3 publications

(2 citation statements)

References 22 publications

(23 reference statements)

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“…At this temperature, no peaks indicative of the rutile phase were observed in the XRD profile. This observation was consistent with the reported preparation of the floating photocatalyst of Cr/S/TiO 2 -hollow glass microspheres (Cr/S/TiO 2 -HGM) that contained anatase TiO 2 after calcination between 500 and 700 °C . However, the rutile phase appeared when the calcination temperature was increased to 800 °C, suggesting that higher calcination temperature affected the phase transformation.…”

Section: Resultssupporting

confidence: 91%

“…Generally, 30–40% of the residual dyes are expected to be released by textile industries into the aqueous system as effluents without proper treatment. However, dyes can hamper human health due to their negative attributes such as being toxic and potentially carcinogenic . Several attempts have been explored to resolve these shortcomings .…”

Section: Introductionmentioning

confidence: 99%

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Titanium Dioxide/Polyvinyl Alcohol/Cork Nanocomposite: A Floating Photocatalyst for the Degradation of Methylene Blue under Irradiation of a Visible Light Source

et al. 2021

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Photocatalytic degradation by the titanium dioxide (TiO2) photocatalyst attracts tremendous interest due to its promising strategy to eliminate pollutants from wastewater. The floating photocatalysts are explored as potential candidates for practical wastewater treatment applications that could overcome the drawbacks posed by the suspended TiO2 photocatalysis system. The problem occurs when the powdered TiO2 applied directly into the treated solution will form a slurry, making its reuse become a difficult step after treatment. In this study, the immobilization of titanium dioxide nanoparticles (TiO2 NPs) on the floating substrate (cork) employing polyvinyl alcohol (PVA) as a binder to anchor TiO2 NPs on the surface of the cork was carried out. Characterizations such as Fourier transformer infrared, X-ray diffraction (XRD), ultraviolet–visible spectroscopy (UV–vis), zeta potential, photoluminescence spectroscopy, femtosecond to millisecond time-resolved visible to mid-IR absorption spectroscopy, ion chromatography, and scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM–EDX) analyses were employed. XRD analysis revealed the formation of anatase-phase TiO2 NPs. The results demonstrated that the crystallite size was 9.36 nm. The band gap energy of TiO2 NPs was determined as 3.0 eV. PL analysis verified that TiO2 NPs possessed a slower recombination rate of electron–hole pairs as compared to anatase TiO2. The result was attributed by the behavior of photogenerated charge carriers on TiO2 NPs, which existed as shallowly trapped electrons that could survive longer than a few milliseconds in this study. Furthermore, SEM–EDX analysis indicated that TiO2 NPs were well distributed on the surface of the cork. At the optimal mole ratio of TiO2/PVA (1:8), the TiO2/PVA/cork floating photocatalyst degraded at 98.43% of methylene blue (MB) under a visible light source which performed better than under sunlight irradiation (77.09% of MB removal) for 120 min. Besides, the mineralization result has measured the presence of sulfate anions after photocatalytic activities, which achieved 86.13% (under a visible light source) and 65.34% (under sunlight). The superior photodegradation performance for MB was mainly controlled by the reactive oxygen species of the superoxide radical (•O2 –). The degradation kinetics of MB followed the first-order kinetics. Meanwhile, the Langmuir isotherm model was fitted for the adsorption isotherm. The floating photocatalyst presented good reusability, resulting in 78.13% of MB removal efficiency even after five cycles. Our TiO2/PVA/cork floating photocatalyst fabrication and high photocatalytic performance are potentially used in wastewater treatment, especially under visible light irradiation.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Titanium Dioxide/Polyvinyl Alcohol/Cork Nanocomposite: A Floating Photocatalyst for the Degradation of Methylene Blue under Irradiation of a Visible Light Source

et al. 2021

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Degradation of toxic methylene blue dye with Zinc oxide (ZnO) nanoparticles synthesized by leaf extract of Madagascar periwinkle plant

Gupta,

Yadav,

Rani

et al. 2024

Biomass Conv. Bioref.

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Renewable and eco-friendly ZnO immobilized onto dead sea sponge floating materials with dual practical aspects for enhanced photocatalysis and disinfection applications

Bhatti¹,

Almani²,

Shah³

et al. 2022

Nanotechnology

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In this study, we have investigated the role of natural Dead Sea Sponge (DSS, Porifera) as a three- dimensional (3D) porous host substrate for the immobilization of nanostructured ZnO towards the development of floating photocatalysts for efficient removal of methylene blue (MB) dye under the illumination of sunlight. Since the treated water after dye degradation contains several pathogens, different disinfectants or chemical reagents are essentially used. This is not the case for DSS as it can naturally kill any pathogens during the wastewater treatment process. To explore these functions, ZnO nanosheets were incorporated onto DSS via hydrothermal protocol and the as prepared ZnO/DSS hybrid material exhibited ~100% degradation efficiency for the removal of MB. Importantly, the degradation kinetics associated with the fabricated ZnO/DSS was remarkably accelerated as evidenced by the high values of degradation reaction rate constants (3.35×10-2 min-1). The outperformance of ZnO/DSS could be attributed to the high rate of adsorption caused by its 3D porous structure together with the rapid oxidation of MB facilitated by the presence of silica (SiO2) within the composition, which acts as semiconducting photosensitive material. Furthermore, the high charge separation of electron-hole pairs, natural porosity, and abundant catalytic sites offered by the hybrid ZnO/DSS floating photocatalyst SiO2 play a major role in achieving ~100% degradation efficiency for MB. Finally, the excellent reusability results confirm the feasibility of using natural ZnO/DSS-based photocatalyst for practical solution of wastewater treatment and other environmental problems.

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Cr/S/TiO2-loaded hollow glass microspheres as an efficient and recyclable catalyst for the photocatalytic degradation of indigo carmine under visible light

Cited by 3 publications

References 22 publications

Titanium Dioxide/Polyvinyl Alcohol/Cork Nanocomposite: A Floating Photocatalyst for the Degradation of Methylene Blue under Irradiation of a Visible Light Source

Titanium Dioxide/Polyvinyl Alcohol/Cork Nanocomposite: A Floating Photocatalyst for the Degradation of Methylene Blue under Irradiation of a Visible Light Source

Degradation of toxic methylene blue dye with Zinc oxide (ZnO) nanoparticles synthesized by leaf extract of Madagascar periwinkle plant

Renewable and eco-friendly ZnO immobilized onto dead sea sponge floating materials with dual practical aspects for enhanced photocatalysis and disinfection applications

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