Nano gold supported on ordered mesoporous WO3/SBA-15 hybrid nanocomposite for oxidative decolorization of azo dye

Malik, Ritu; Rana, Pawan S.; Tomer, Vijay K.; Chaudhary, Vandna; Nehra, S.P.; Duhan, Surender

doi:10.1016/j.micromeso.2015.12.013

Cited by 63 publications

(22 citation statements)

References 44 publications

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“…However, these methods are inefficient having operational problems such as generation of sludge, which leads to disposal problems and require further separation techniques adding more cost to the entire process. An alternative to this, an advanced oxidation process (AOP) is used which starts with the generation of strong hydroxyl radicals, which can completely degrade the pollutant into less toxic or harmless products (CO 2 and H 2 O) [4][5][6]. The main supremacy of the AOP is that there is no consumption of chemicals, no sludge production and no strict lab conditions are required [7].…”

Section: Introductionmentioning

confidence: 99%

“…The main features to be effective photocatalysts are stability, non-toxicity, suitable morphology, appropriate band gap and reusability [10]. Nickel oxide (NiO) nanoparticles have been effectively used as photocatalysts [4]. NiO is a stable p-type semiconductor metal oxide having tendency to absorb UV radiations due to its wide band gap and therefore a small portion of the solar spectrum is absorbed by this material [11].…”

Section: Introductionmentioning

confidence: 99%

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Visible light photocatalysis of methylene blue using cobalt substituted cubic NiO nanoparticles

Khatri¹,

Rana²

2019

Bull Mater Sci

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This study reports the facile co-precipitation synthesis of pure and cobalt substituted NiO nanoparticles. The cubic crystalline structure of the synthesized NiO nanoparticles was confirmed through X-ray diffraction. Structural behaviour, morphological, elemental composition and optical properties of the prepared nanoparticles are investigated by Fourier transform infrared spectroscopy, scanning electron microscopy-energy dispersive spectrum, transmission electron microscopy and UV-Vis spectroscopy. The optical band gap is determined using UV spectra and is observed to decrease with an increase in cobalt ion concentration. Furthermore, methylene blue dye solution has been used to investigate the photocatalytic ability of the synthesized nanoparticles in the presence of sunlight. It is found that percentage degradation in dye concentration increases with irradiation time and also with the increase in the concentration of doping of cobalt in NiO. The dye solution is found to degrade to 94% within 50 min in the presence of solar radiation and the Ni 0.6 Co 0.4 O sample.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visible light photocatalysis of methylene blue using cobalt substituted cubic NiO nanoparticles

Khatri¹,

Rana²

2019

Bull Mater Sci

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“…Materials with high surface area when used as sensor offer superior permeability and more active sites for the easier adsorption, transmission, and diffusion of charge carriers across the sensor surface . In addition, the materials with mesoporous morphology can easily be functionalized with guest molecules (metals or metal oxides) without agglomerating them inside the periodic mesopore channels . In virtue of the advantages associated with mesoporous architecture of materials, several methods such as exfoliation and hard templating using mesoporous silica (SBA‐15, KIT‐6) have been practiced to increase the surface area of traditional g‐CN material for utilization in a variety of applications …”

Section: Introductionmentioning

confidence: 99%

Retracted: Ordered Mesoporous Ag–ZnO@g‐CN Nanohybrid as Highly Efficient Bifunctional Sensing Material

Malik

Tomer

Kienle

et al. 2018

Adv Materials Inter

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reversible interactions with the targeted analyte molecules. [3][4][5][6] The precise detection of relative humidity (%RH) in meteorology, weather forecasting, libraries, electronics, food processing, packaging, automobile industry, paper and textile technology, clinical diagnosis through breath monitoring, and agricultural field is continuously endorsing the interest in realizing promising %RH sensors. [7,8] While dealing with the noninvasive detection of volatile organic compounds (VOCs) in clinical diagnosis applications through breath monitoring, there always remains a challenge to distinctively detect specific biomarker (acetone for diabetes, ethanol for drunken driving, 1-butanol for skin cancer, formaldehyde for lung cancer, hydrogen sulfide for halitosis, and trimethylamine for trimethylaminuria) by reducing cross sensitivity to high humid contents of human breath (≈90%RH). [9][10][11][12][13] Researchers have been targeting highly efficient (excellent response, good linearity, short response/ recovery, and small hysteresis) multifunctional sensors utilizing numerous scientific and technological methods and exploring novel mesoporous materials with diverse morphologies. [14][15][16] In this context, mesoporous materials with high specific surface area and tunable pore diameter provide have proven out to be excellent solutions in designing sensing materials with extended multifunctionalities. [3][4][5][6]9,14] Graphitic carbon nitride (g-C 3 N 4 or g-CN), a metal-free polymer having structural resemblance with 2D layered graphite materials, has emerged out to be such a multifunction material. [17][18][19] For its extremely promising semiconducting, mechanical, optical, and chemical properties, g-CN has attracted much spotlight in bioimaging, photo(catalysis), water splitting, electrocatalysis, metal ions detection, and fuel cell applications. [20][21][22][23] Besides, the earth-abundant nature of its constituent elements (carbon and nitrogen) favors the low production cost of g-CN. [17,18] Yet, the very low surface area of g-CN (<15 m 2 g −1 ) offers multiple challenges in utilizing this fascinating material in "gas sensing technology" for which the basic need always remains the availability of high surface area. Materials with high surface area when used as sensor offer superior permeability and more active sites for the easier adsorption, transmission, and diffusion of charge carriers across the sensor The development of highly efficient and multifunctional sensors for accurately detecting indoor climate has always remained a challenging task. In this work, an important progress for nanocasting synthesis of ordered mesoporous Ag-ZnO-loaded graphitic carbon nitride (g-CN) prepared through template inversion of mesoporous silica, KIT-6, is presented. The cubic 3D ordered mesoporous Ag-ZnO@g-CN nanohybrid demonstrates excellent sensitivity, rapid response/recovery (5.1/2 s), excellent reversibility (0.3%), high stability, and negligible hysteresis (0.5%) to relative humidity (%RH) in the 11-98%RH range. Bes...

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“…This is due to the fact that SnO 2 has a lower isoelectric point (IEP, at pH 4–5) than TiO 2 (IEP, at pH 6–7), which leads to less adsorption of the dye under acidic conditions. According to IEP, surface is primarily positively charged when the value of pH is less than IEP and negatively charged when the value of pH is more than IEP . The catalyst showed a higher degradation efficiency and adsorption performance for RhB because the catalysts surface was nearly negatively charged and it can easily adsorb positively charged RhB molecules by electrostatic interactions.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Hybridized Mesoporous Au@TiO₂/SnO₂as Efficient Photocatalyst and Selective VOC Sensor

et al. 2016

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Considering the novelty of heterojunction formation in sunlight photocatalysis, dahlia flower resembling Au loaded TiO2/SnO2 nanocomposite was synthesized using facile hydrothermal method to improve the degradation rate of waste water pollutants. The intrinsic high surface area coupled with unique heterojunction formation causes Au@TiO2/SnO2 to exhibit excellent photocatalytic activity towards the degradation of Rhodamine B (RhB) dye under sunlight irradiation. Under the optimized conditions of catalyst dosage (0.3 g/L), dye concentration (100 ppm) and pH (10), 99.2 % of the RhB aqueous solution was degraded in 35 min of illumination time. Moreover, the resulting Au@TiO2/SnO2 nanohybrid unveiled excellent sensing response (43) towards acetone gas (100 ppm) while detecting a variety of common volatile organic compounds (VOCs) including methanol, benzyl alcohol and isopropanol at 220 °C. Thus, the enhanced photocatalytic activity for degrading organic pollutants under sunlight irradiation and excellent sensing properties at relatively lower working temperature, make this porous nanohybrid a promising candidate for environmental monitoring applications.

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Nano gold supported on ordered mesoporous WO3/SBA-15 hybrid nanocomposite for oxidative decolorization of azo dye

Cited by 63 publications

References 44 publications

Visible light photocatalysis of methylene blue using cobalt substituted cubic NiO nanoparticles

Visible light photocatalysis of methylene blue using cobalt substituted cubic NiO nanoparticles

Retracted: Ordered Mesoporous Ag–ZnO@g‐CN Nanohybrid as Highly Efficient Bifunctional Sensing Material

Facile Synthesis of Hybridized Mesoporous Au@TiO₂/SnO₂as Efficient Photocatalyst and Selective VOC Sensor

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Nano gold supported on ordered mesoporous WO3/SBA-15 hybrid nanocomposite for oxidative decolorization of azo dye

Cited by 63 publications

References 44 publications

Visible light photocatalysis of methylene blue using cobalt substituted cubic NiO nanoparticles

Visible light photocatalysis of methylene blue using cobalt substituted cubic NiO nanoparticles

Retracted: Ordered Mesoporous Ag–ZnO@g‐CN Nanohybrid as Highly Efficient Bifunctional Sensing Material

Facile Synthesis of Hybridized Mesoporous Au@TiO2/SnO2as Efficient Photocatalyst and Selective VOC Sensor

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Facile Synthesis of Hybridized Mesoporous Au@TiO₂/SnO₂as Efficient Photocatalyst and Selective VOC Sensor