Photoactive and non-hazardous kaolin/ZnO composites prepared by calcination of sodium zinc carbonate

Janíková, Barbora; Tokarský, Jonáš; Kutláková, Kateřina Mamulová; Kormunda, Martin; Neuwirthová, Lucie

doi:10.1016/j.clay.2017.04.003

Cited by 14 publications

(3 citation statements)

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“…3,24,25 This problem can be mitigated with some procedures, such as the dispersion on inorganic matrices, 17,26,27 such as clay minerals. Clay minerals are attractive materials for many significant applications, due to their physical and chemical properties, including catalysis/photocatalysis and adsorption, 12,28,29 especially kaolinite, whose layered structure provides the possibility of retention of a great variety of compounds to reduce the energy required for the activation of the semiconductor. Catalyst improvement via immobilization might also be due to the force field between the support and the TiO 2 particles that inhibits the recombination of electron-hole pairs.…”

Section: Introductionmentioning

confidence: 99%

Kaolinite/TiO2/cobalt(II) Tetracarboxymetallophthalocyanine Nanocomposites as Heterogeneous Photocatalysts for Decomposition of Organic Pollutants Trimethoprim, Caffeine and Prometryn

Silva¹,

Ribeiro²,

Nassar³

et al. 2019

J. Braz. Chem. Soc.

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São Simão's Brazilian kaolinite has been treated with titanium(IV) isopropoxide and cobalt(II) tetracarboxymetallophthalocyanine under different conditions (acidic or basic), leading, after drying at 100 ºC, to new titania-doped cobalt(II)-metallophthalocyanine/kaolinite solids. These solids were characterized by chemical analysis, powder X-ray diffraction, Fourier transform infrared spectroscopy, thermal analyses and nitrogen adsorption. No significant changes were observed by diffractometry, but the specific surface area depended of the synthetic route followed. The ability of these solids for photodegradation of trimethoprim, caffeine and prometryn was evaluated. The photodegradation was followed via mass spectrometry and UV-Vis absorption spectroscopy. The presence of photodegradation by-products was verified in all cases. All the photocatalysts showed high photodegradation rate against prometryn, trimethoprim and caffeine, the degradation efficiencies were 54, 30 and 90%, respectively, when using the heterogeneous photocatalysts. Comparison with commercial TiO 2 (Degusa ®) proved that the synthesized photocatalyst based on kaolinite present higher degradation rate than isolated titanium dioxide.

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Section: Introductionmentioning

confidence: 99%

Kaolinite/TiO2/cobalt(II) Tetracarboxymetallophthalocyanine Nanocomposites as Heterogeneous Photocatalysts for Decomposition of Organic Pollutants Trimethoprim, Caffeine and Prometryn

Silva¹,

Ribeiro²,

Nassar³

et al. 2019

J. Braz. Chem. Soc.

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“…Synthesis of ZnO and ZnO/kaolinite composite. ZnO/ Kaolinite composite was synthesized by keeping the molar ratio of Zn 2+ : OH − being 1:5 and the mass ratio of kaolin to ZnO 1:1 (50%wt:50%wt) as reported by K Mamulová Kutláková et al [55]. In a particular procedure, 0.5 g of kaolin clay was dissolved into 50 ml of distilled water and sonicated for 30 min.…”

Section: Chemicals and Reagentsmentioning

confidence: 99%

Visible light-driven photocatalytic activity of Cu₂O/ZnO/Kaolinite-based composite catalyst for the degradation of organic pollutant

Fufa¹,

Feyisa²,

Gultom³

et al. 2022

Nanotechnology

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Herein, we design to synthesize a novel Cu2O/ZnO/kaolinite composite catalyst by co-precipitation method. The synthesized composite catalysts were labeled as 5CZK, 10CZK, 15CZK, and 20CZK which represent 5, 10, 15, and 20% of Cu2O, respectively, on ZnO/kaolinite. The photocatalyst samples were characterized with different instruments. Moreover, the methylene blue (MB) dye was used as a target organic pollutant and the degradation was evaluated under visible light irradiation. The highest performance for the degradation of MB was achieved by 10CZK catalyst and degrades 93% within 105 min. However, ZnO (Z), Cu2O/ZnO (CZ), 5CZK, 15CZK, and 20CZK composite catalysts, degrades 28, 66, 76, 71, and 68 % of MB dye, respectively. The enhanced degradation efficiency of 10CZK composites catalyst could be due to the higher adsorption properties from metakaolinite and the light-responsive properties of the Cu2O/ZnO samples under visible light. Hence, the resulting composite catalyst could be applicable for environmental remediation.

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“…Kaolin-ZnO NPs and kaolin-TiO 2 NPs are also reported as efficient photocatalysts for the degradation of organic compounds. 27,28 Ayodele and Hameed also reported kaolinite-supported ferric oxalate for photo-Fenton degradation of 4-NP. 29 But there is no report on use of kaolin-Fe 3 O 4 for Fenton-like degradation of 4-NP and detailed process optimizations.…”

Section: Introductionmentioning

confidence: 97%

RSM-BBD Optimization of Fenton-Like Degradation of 4-Nitrophenol Using Magnetite Impregnated Kaolin

Belachew

Fekadu

Abebe

2020

Air, Soil and Water Research

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In this work, we have reported a low-cost and environmentally friendly Fe3O4-modified activated kaolin (AK-Fe3O4) composite for efficient Fenton-like degradation of 4-nitrophenol (4-NP) and optimization of the degradation variables. The AK-Fe3O4 composites were characterized by Fourier transform infrared spectroscopy, powder x-ray diffraction, scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). X-ray diffraction confirms the syntheses of pure phases of Fe3O4 and AK-Fe3O4. The SEM image of the AK-Fe3O4 composite reveals the formation of a highly porous surface. The room temperature VSM analysis describes the superparamagnetic nature of AK-Fe3O4 composites with 25 emu/g magnetization values. Response surface methodology coupled with Box-Behnken design was used to optimize the 4-NP degradation (%) variables such as contact time (10-90 minutes), 4-NP concentration (10-30 mg/L), and pH (3-8). The high regression value ( R² = 0.9964 and adjusted R² = 0.9917) and analysis of variance ( P < .0001) show that the quadratic model can sufficiently explain the 4-NP degradation (%). The optimum 4-NP degradation was found to be 96.01% ± 1.89% using 1 mg/mL of AK-Fe3O4, 20 mg/L of 4-NP, 97.9 mmol/L of H2O2, and pH of 3 at the end of 75 minutes of reaction time. Moreover, the catalyst shows good recyclability and stability after 5 successive degradations of 4-NP. In general, a low-cost and magnetically separable AK-Fe3O4 composite is an effective Fenton-like catalyst for the degradation of 4-NP.

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Photoactive and non-hazardous kaolin/ZnO composites prepared by calcination of sodium zinc carbonate

Cited by 14 publications

References 50 publications

Kaolinite/TiO2/cobalt(II) Tetracarboxymetallophthalocyanine Nanocomposites as Heterogeneous Photocatalysts for Decomposition of Organic Pollutants Trimethoprim, Caffeine and Prometryn

Kaolinite/TiO2/cobalt(II) Tetracarboxymetallophthalocyanine Nanocomposites as Heterogeneous Photocatalysts for Decomposition of Organic Pollutants Trimethoprim, Caffeine and Prometryn

Visible light-driven photocatalytic activity of Cu₂O/ZnO/Kaolinite-based composite catalyst for the degradation of organic pollutant

RSM-BBD Optimization of Fenton-Like Degradation of 4-Nitrophenol Using Magnetite Impregnated Kaolin

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Photoactive and non-hazardous kaolin/ZnO composites prepared by calcination of sodium zinc carbonate

Cited by 14 publications

References 50 publications

Kaolinite/TiO2/cobalt(II) Tetracarboxymetallophthalocyanine Nanocomposites as Heterogeneous Photocatalysts for Decomposition of Organic Pollutants Trimethoprim, Caffeine and Prometryn

Kaolinite/TiO2/cobalt(II) Tetracarboxymetallophthalocyanine Nanocomposites as Heterogeneous Photocatalysts for Decomposition of Organic Pollutants Trimethoprim, Caffeine and Prometryn

Visible light-driven photocatalytic activity of Cu2O/ZnO/Kaolinite-based composite catalyst for the degradation of organic pollutant

RSM-BBD Optimization of Fenton-Like Degradation of 4-Nitrophenol Using Magnetite Impregnated Kaolin

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Product

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Visible light-driven photocatalytic activity of Cu₂O/ZnO/Kaolinite-based composite catalyst for the degradation of organic pollutant