Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO

Nazarkovsky, Michael; Гунько, В.М.; Wójcik, Grzegorz; Czech, Bożena; Sobieszek, Agnieszka; Skubiszewska–Zięba, J.; Janusz, W.; Skwarek, Ewa

doi:10.15407/hftp05.04.421

Cited by 4 publications

(4 citation statements)

References 74 publications

(80 reference statements)

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“…The two absorption edges emanate from bulk structures and different phases of minerals revealed by XRF and XRD in Table 1 and Figure 3 (A), respectively. For example, TiO2 is known to possess two phases namely rutile and anatase which are responsible for two absorption edges in the composite sample (Nazarkovsky et al, 2014). Figure 4 (d) implies that the materials combine the features of GOL clay (SiO2, Al2O3, TiO2, Fe2O3) and CNT resulting into new properties which could modify the process of the e − / h + pair formation (Saleh and Gupta, 2012).…”

Section: Optical Analysis Of Gol; 5 % Cnt-gol and 10 % Cnt-golmentioning

confidence: 99%

Titania containing natural clay doped with carbon nanotubes for enhanced natural photocatalytic discoloration of wastewater

et al. 2021

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Water contamination with dyes is harmful to humans and the environment. This study investigated the photocatalytic activity of natural clay (GOL) mixed with carbon nanotubes (CNT) for removal of brilliant black (BB) in wastewater. The materials were characterized with FESEM-EDS, XRD, XRF, FTIR and UV-vis DRS. The natural clay contains 2.34 % TiO2 which is 75 % more than most natural clays. SEM showed that CNT were well dispersed and mixed with clay. DRS spectra showed two absorption bands above 380 nm. CNT in GOL has decreased significantly the energy band gaps from 2.75 and 3.25 eV to 1.53 and 2.90 eV for GOL and 10 % CNT-GOL respectively. Photocatalytic activity was enhanced with degradation of BB increased from 66 % to 95 % with GOL and 10 % CNT-GOL respectively after 45 min of visible light irradiation. The improvement can be attributed to the synergy of the interface heterojunction of clay and CNT. The presence of CNT reduces the e − and h + (e − / h + ) pairs recombination, facilitates the production of reactive oxygen species responsible for the decay of dye. The addition of H2O2 to the experiment (2 mmoL) confirmed the role of holes and hydroxyl radicals. 85 % of BB carbon content was removed with 10 % CNT-GOL suggesting that mineralization occurred. After 45 min of visible light irradiation, the degradation kinetic studies followed a second-order reaction with a R 2 = 0.997. Therefore, natural clay-CNT nanocomposites can be applied to treat dyes containing wastewaters.

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Section: Optical Analysis Of Gol; 5 % Cnt-gol and 10 % Cnt-golmentioning

confidence: 99%

Titania containing natural clay doped with carbon nanotubes for enhanced natural photocatalytic discoloration of wastewater

et al. 2021

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“…This may be attributed to the definite shift in the micro‐environment of the NPs with in ZIF‐8 frameworks. The band gap value in general depends on crystallite size, structural parameter, loading amount of NPs, lattice strain and impurities …”

Section: Characterizationmentioning

confidence: 99%

Multi-Core-shell TiO₂ NPs@ZIF-8 Composite for Enhanced Photocatalytic Degradation and Adsorption of Methylene Blue and Rhodamine-B

Chandra

Nath

2017

ChemistrySelect

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Multi‐Core–shell TiO2NPs@ZIF‐8 composites were synthesized by in situ encapsulation of different amounts of TiO2NPs (150, 300 and 500 μL suspension of TiO2NPs in methanol) in ZIF‐8 at room temperature. Encapsulation of TiO2NPs in ZIF‐8 was confirmed by transmission electron microscopy and X‐ray photoelectron spectroscopy. ZIF‐8 and its core–shell composites have similar crystal structure and morphology as confirmed by powder X‐ray diffraction analysis and scanning electron microscopy. The detailed photocatalytic degradation and adsorption studies of methylene blue and rhodamine‐B were investigated by considering various factors, viz. amount of loading of TiO2NPs in ZIF‐8, amount of photocatalyst, pH and initial concentration of the dye. At higher pH (11.5−12.6), TiO2NPs@ZIF‐8 composite exhibited higher (≈ 8 times) photocatalytic activity as compared to TiO2NPs and the optimum amount of TiO2NPs@ZIF‐8 composite was 10 mg for the maximum photodegradation of 3.19 mg L−1 (93 %) and 2.4 mg L−1 (57 %) of methylene blue and rhodamine‐B, respectively.

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“…This enables MgO to be used in many basecatalyzed processes in a large number of organic reactions [11]. The composite materials led to altering the band gap and increasing the effectiveness of photocatalysts than the single oxide [12].…”

Section: ■ Introductionmentioning

confidence: 99%

Synthesis, Characterization and Catalytic Activity of NiO-CoO-MgO Nano-Composite Catalyst

et al. 2019

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The ternary NiO-CoO-MgO catalyst in three ratios 20:20:60, 25:25:50, and 30:30:40 for these component oxides respectively, were synthesized by co-precipitation method of their carbonates by addition of a precipitate agent in basic media, and then calcinated these carbonate to obtain of mixed oxides. The prepared catalysts were characterized by using Powder X-Ray Diffraction (PXRD), Fourier Infrared spectroscopy (FT-IR), and Atomic Force Microscopy techniques (AFM) were used for identification of the prepared catalysts. The result showed that the particle size of these catalyst ratios, were in the nano range and the smallest size was 25:25:50. The investigation of catalytic activity of prepared catalysts was done by photo decolorization of Celestine blue B dye from simulated industrial wastewaters in aqueous solution. The decolorization efficiency of dye reached 99.9% after irradiation time for 1 h. Study the effect of different reaction conditions such as the pH of the medium, the weight of semiconductor and temperature of mixture reaction were shown that the maximum degradation was observed in conditions at pH = 4, catalyst dosage = 0.08 g, and temperature = 303 K.

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Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO

Abstract: The CuO and NiO doped silica/titania nanocomposites were investigated using ultraviolet-visible light diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the samples was studied in photooxidation of caffeine (CAF

Cited by 4 publications

References 74 publications

Titania containing natural clay doped with carbon nanotubes for enhanced natural photocatalytic discoloration of wastewater

Titania containing natural clay doped with carbon nanotubes for enhanced natural photocatalytic discoloration of wastewater

Multi-Core-shell TiO₂ NPs@ZIF-8 Composite for Enhanced Photocatalytic Degradation and Adsorption of Methylene Blue and Rhodamine-B

Synthesis, Characterization and Catalytic Activity of NiO-CoO-MgO Nano-Composite Catalyst

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Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO

Abstract: The CuO and NiO doped silica/titania nanocomposites were investigated using ultraviolet-visible light diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the samples was studied in photooxidation of caffeine (CAF

Cited by 4 publications

References 74 publications

Titania containing natural clay doped with carbon nanotubes for enhanced natural photocatalytic discoloration of wastewater

Titania containing natural clay doped with carbon nanotubes for enhanced natural photocatalytic discoloration of wastewater

Multi-Core-shell TiO2 NPs@ZIF-8 Composite for Enhanced Photocatalytic Degradation and Adsorption of Methylene Blue and Rhodamine-B

Synthesis, Characterization and Catalytic Activity of NiO-CoO-MgO Nano-Composite Catalyst

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Multi-Core-shell TiO₂ NPs@ZIF-8 Composite for Enhanced Photocatalytic Degradation and Adsorption of Methylene Blue and Rhodamine-B