Photocatalytic green synthesis of piperonal in aqueous TiO2 suspension

Bellardita, Marianna; Loddo, Vittorio; Palmisano, Giovanni; Pibiri, Ivana; Augugliaro, Vincenzo

doi:10.1016/j.apcatb.2013.07.070

Cited by 52 publications

(38 citation statements)

References 23 publications

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“…164 Pristine and doped titania have been mainly used as photocatalysts, owing to their reliability, stability under irradiation and low cost, although different semiconductor and insulator solids have also been used. Recently, Augugliaro and co-workers 165 investigated the UV photo-oxidation of piperonyl alcohol in water using a TiO 2 suspension. All the TiO 2 samples, prepared by the hydrolysis of TiCl 4 or from TiOSO 4 precursor -less crystalline and more hydroxylated than commercial titania -exhibited higher selectivity, but their reaction rate was higher in the presence of commercial Degussa P25.…”

Section: Photochemistry In Oxidation Reactionsmentioning

confidence: 99%

Homogeneous, Heterogeneous and Nanocatalysis

Albonetti

Mazzoni

Cavani

2014

Transition Metal Catalysis in Aerobic Alcohol Oxidation

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The past decade has seen ever-increasing interest in the catalytic aerobic oxidation of alcohols, which is one of the pivotal functional group transformations in organic chemistry. Nevertheless, most of the current methods for alcohol oxidation are not catalytic, hence the use of catalysts and green oxidants such as O2 or air, instead of stoichiometric quantities of inorganic oxidants, will provide a highly desirable approach to this reaction. This chapter summarizes the latest breakthroughs in the use of homogeneous and heterogeneous catalysts in aerobic alcohol oxidation in the liquid phase; the use of microwaves and photochemistry to assist and promote catalytic activities is also highlighted. Moreover, since nanoparticle systems may be considered an interesting compromise between heterogeneous and homogeneous catalytic systems, the recent development of soluble transition metal colloids as active nanocatalysts for aerobic alcohol oxidation is also presented.

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Section: Photochemistry In Oxidation Reactionsmentioning

confidence: 99%

Homogeneous, Heterogeneous and Nanocatalysis

Albonetti

Mazzoni

Cavani

2014

Transition Metal Catalysis in Aerobic Alcohol Oxidation

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“…adsorption on activated carbon, flocculation and electrocoagulation are not efficient methods because the dyes remain in solid wastes, therefore creating secondary pollutions. Advanced oxidation processes (AOPs), such as heterogeneous photocatalysis, are an attractive alternative for the removal of soluble organic compounds because they are very effective in the degradation of non‐biodegradable organic contaminants in wastewater …”

Section: Introductionmentioning

confidence: 99%

N‐doped TiO₂/s‐PS aerogels for photocatalytic degradation of organic dyes in wastewater under visible light irradiation

Vaiano

Sacco

Sannino

et al. 2014

J of Chemical Tech & Biotech

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BACKGROUND: Heterogeneous photocatalysis for the degradation of non-biodegradable organic contaminants in wastewater is an alternative to traditional treatment techniques. Since the applications developed employ photocatalysts in powder form, a main disadvantage remains related to the recovery of photocatalysts from the treated wastewater, resulting in damage and shorter lifetime for the recirculation pumps. Structured photocatalysts offer a valid solution to simplify the process; however, they have to guarantee light transmission, long-term stability under different operating conditions and under mechanical stress. RESULTS: The photocatalytic performances of N-doped TiO 2 nanocomposite syndiotactic polystyrene aerogels (Nt-sPS) were analyzed in the presence of visible light. A widely used model pollutant, methylene blue (MB), was chosen to verify the photocatalytic performance. After about 180 min of irradiation, on Nt-sPS, the conversion of MB reached 30%, higher than that obtained (16%) when the photocatalyst is suspended as powder in the liquid reaction medium. CONCLUSION: N-doped TiO 2 , obtained by direct nitration during the hydrolysis of titanium tetraisopropoxide with ammonia solutions, was immobilized in s-PS aerogels, yielding high activity in the removal of methylene blue under visible light irradiation, in comparison with N-doped TiO 2 dispersed as powder in solution.

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“…Most involve the oxidation of benzyl alcohol derivatives, [43] trans-ferulic acid, [44] isoeugenol, [45] amines, [46] and piperonyl alcohol [47] and the selective cyclization of aromatic acids. [48] As the most attractive photocatalyst, Pt-loaded TiO 2 nanoparticles have been used extensively for green synthesis.…”

Section: Uv Light-driven Photocatalysismentioning

confidence: 99%

“…Plenty of reports have provided strategies to expand the light harvesting region from UV to visible light. [50][51][52][53] Basically, three general strategies are most widely accepted: winnowing narrow band gap semiconductors with intrinsic visible light-driven photocatalysis; [48] tuning the band structure by introducing external atoms or defects; [47,50] and loading dyes, quantum dots, or noble metals to absorb/enhance the visible light absorption. [54,55] Problems of visible light absorption have been mostly solved.…”

Section: Visible-light-driven Photocatalysismentioning

confidence: 99%

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Wang

Sang

et al. 2017

Advanced Energy Materials

258

116

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photocatalysis based on semiconductors represents another route for light energy conversion. This route endows the direct conversion of light energy into oxidation and reduction energy via charge carriers (electrons and holes) generated in the semiconductors. For instance, the photocatalytic degradation of harmful and toxic organic substances, dyes, and chemicals has been considered to be a suitable candidate for removing organic pollution from water, [5][6][7][8] where photooxidation dominates the degradation of the organic molecules. The full process of photocatalytic water splitting into H 2 and O 2 is believed to be promising for generating renewable and green energy, [9,10] and the process includes the photoreduction and photooxidation of water, respectively. The photocatalytic reduction of CO 2 can convert solar energy into chemical energy, stored as CH 4 , CO, CH 3 OH, etc. [11][12][13] These processes can help reduce the pressure of the global warming crisis and supply usable renewable energy. Due to the precise control of photocatalytic reduction and oxidation, photocatalytic molecular synthesis has also attracted much interest, which provides a sustainable pathway for green synthesis. [14][15][16] For an efficient photocatalytic process, solar light harvesting and a redox process based on photogenerated charge carriers are essential steps. Solar light harvesting consists of light absorption and charge carrier excitation steps, which can be expressed as the light utilization efficiency. The efficiency determines the total energy converted from solar light and is mostly determined by the band structure of the semiconductor applied to the photocatalytic process.The photocatalytic process has been extensively studied by examining the response of photocatalysts to UV light, due to its relatively high photonic energy. As is well known, UV light energy amounts to no more than 5% of the solar light energy. Visible light and near-infrared (NIR) light contain approximately 90% of the solar light energy. To utilize solar light in order to solve the environmental and energy crisis, visible light and NIR-light-activated photocatalysts are essential. For decades, many studies have focused on expanding the range over which a photocatalyst can utilize the solar light spectrum. In addition, there are several good reviews summarizing recent progress on UV-vis-light-activated photocatalysts, as well as strategies to improve the photocatalytic efficiency. [17][18][19][20] As is well known, the photonic energy of visible light is low, and that of NIR light is even lower. Photoinduced redox requires an initial amount of energy to activate the process; however, NIR photonic energy may be too low to realize photoinduced The realization of light-chemical energy conversion using solar light is an ideal goal in renewable energy studies. Many reports are concerned with extracting energy from solar light and the use/storage of the converted energy. Due to the progress in solar light absorption with various photocatalysts, the vari...

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Photocatalytic green synthesis of piperonal in aqueous TiO2 suspension

Cited by 52 publications

References 23 publications

Homogeneous, Heterogeneous and Nanocatalysis

Homogeneous, Heterogeneous and Nanocatalysis

N‐doped TiO₂/s‐PS aerogels for photocatalytic degradation of organic dyes in wastewater under visible light irradiation

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

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Photocatalytic green synthesis of piperonal in aqueous TiO2 suspension

Cited by 52 publications

References 23 publications

Homogeneous, Heterogeneous and Nanocatalysis

Homogeneous, Heterogeneous and Nanocatalysis

N‐doped TiO2/s‐PS aerogels for photocatalytic degradation of organic dyes in wastewater under visible light irradiation

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

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About

N‐doped TiO₂/s‐PS aerogels for photocatalytic degradation of organic dyes in wastewater under visible light irradiation