Nitrogen-doped titanium dioxide photocatalysts for visible response prepared by using organic compounds

Nosaka, Yoshio; Matsushita, Masami; Nishino, Junichi; Nosaka, Atsuko Y.

doi:10.1016/j.stam.2004.11.006

Cited by 293 publications

(207 citation statements)

References 18 publications

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“…It's a crucial drawback in photo-catalysts of TiO 2 based application [6]. So, in the recent years have been many research efforts devoted to improve the photocatalytic activity by incorporating of metal particles (silver, gold and iron) [7][8][9], to broaden the absorption of solar radiations by doping with nitrogen and to reactivate the TiO 2 -based photo-catalysts by treating with heat [10,11]. An alternative type of catalysts for photodegradation of organic dyes is nanoparticles of some transition metals such as silver.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Degradation of Organic Dyes using Synthesized Silver Nanoparticles: A Green Approach

S¹,

M²,

MV³

2015

J Bioremed Biodeg

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The scientific community is search in for new methods for the synthesis of metallic nanoparticles. Green synthesis has now become a vast developing area of new research groups. Here we report a green method to the synthesis of silver nanoparticles (AgNPs) using the different parts of Vishanika or Indian screw tree, an ayurvedic medicinal tree. This is nontoxic, eco-friendly and low cost method. The reduction and stabilization capability of the plant extracts of different parts are described. The size and structure of the silver can be characterized by varying the plant parts of the vishanika. The biosynthesized nanoparticles are characterized by using UV-VIS spectroscopy, TEM, XRD, DLS and FTIR. The size and extract dependent catalytic activity of the biosynthesized nanoparticles is established in the degradation of organic dyes.plant products represent excellent platforms for this purpose [6][7][8]13]. The compounds present in plants that have different potential biological activities; phytochemicals are important natural resource for the synthesis of metal nanoparticles. They play important roles in both stabilization and reduction of nanoparticles. The focus of the present work is to apply the accurate principles of green chemistry for the synthesis of silver nanoparticles by using stem bark, root and leaf of Helicteres isora extracts as stand-alone reducing and capping agent. H. isora plant extracts possess anticancer properties [14]. Usually, the bark and root juice were used against diabetes and emphysema. In traditional medicine, the bark and root juice is claimed to be useful in snake bite, diabetes, blood disorder, cough, colic, diarrhoea, astringent, etc., [15], expectorant and astringent [16], hypolipidemic [17], antihyperglycemic activity and glibenclamide [18]. In the present study, we have investigated the extracts and size dependent catalytic degradation of organic dyes-methyl violet, safranin, eosin methylene blue and methyl orange by in the presence of silver colloids. Materials and MethodsSilver nitrate (99.99%), methyl violet, safranin, eosin methylene blue and methyl orange, were purchased from sigma Aldrich. All glassware's were cleaned with sterile distilled water and rinsed with deionized water. Preparation of extractDifferent parts of (stem bark, root and leaf) H. isora were collected from Western Ghats of Tamil Nadu, washed with sterile distilled water and dried, then make it powder. 1 g of each explants powder was mixed with 100 mL of water and kept on orbital shaker at 120 rpm for 12 h. After that, the extracts were filtered with filter paper and stored at 4 0 C in refrigerator until further use. Journal of Bior emediation & Biodegradation Synthesis of silver nanoparticlesSilver nanoparticles (stem bark (S), root (R) and leaf (L)) have been synthesized by Bhakya et al. [19] method with slight modification. The formation of AgNPs is indicated by the appearance of dark brown color within 5 min. CharacterizationUV-visible spectra analysis was performed for all samples and the abs...

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Section: Introductionmentioning

confidence: 99%

Catalytic Degradation of Organic Dyes using Synthesized Silver Nanoparticles: A Green Approach

S¹,

M²,

MV³

2015

J Bioremed Biodeg

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“…It is reported in the literature, in fact, that a high level of doping does not necessarily correspond to a high photocatalytic performance [10,11]. The dopant element, in fact, usually lead to active species for photocatalysis under visible light but, at the same time, it can form species having a detrimental effect on the material photoactivity [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of the chemical synthesis on the physicochemical properties of N-TiO2 nanoparticles

et al. 2013

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Abstract.Nitrogen doped TiO 2 materials were successfully prepared following three different preparation routes (sol-gel, hydrothermal and pyrolysis) and characterized by various spectroscopic techniques.All samples absorbed radiation in the visible range and were active in the photocatalytic degradation of cyanotoxin microcystin-LR under visible light and in acidic conditions. The different preparation routes led to the formation of various impurities into the solids. In the case of hydrothermal and sol-gel samples, these impurities were weakly bound at the surface whereas the materials prepared by pyrolysis, the impurities showed a relevant stability and could not be removed even at high temperature. On the basis of the photocatalytic data illustrated in this paper, the presence of such species was not detrimental for the photocatalytic activity of nitrogen doped TiO 2 but actually contributed to a higher interaction with the target cyanotoxin; leading to a higher photocatalytic activity than that observed for samples prepared via the classic sol-gel method.

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“…A Si photodiode was 75 used to measure the light intensity to calibrate the system. The output gas samples were collected from the head space of a sealed PEC chamber using an air-tight gas syringe through the manual sampling port in the top of the chamber (flexible cork made of Teflon) and further subjected to gas chromatographic 80 analysis to evaluate the constituents of the gas products.…”

Section: (Photo)-electrochemical Characterizationmentioning

confidence: 99%

“…This layer represents the formation of TiN/TiO x N y on TiO 2 NW surface during the nitridation process. Although it was difficult to obtain 80 lattice resolved TEM images at the surface of N-TiO 2 NWs, the X-ray diffraction (XRD) and SAED patterns support that N-TiO 2 NWs maintain their polycrystalline anatase phase (See Supporting information Fig.S1). There are no noticeable changes on the geometry of the NWs after Au NPs anchoring (Fig.…”

mentioning

confidence: 97%

“…75 We adopt the optimized Au NPs concentration condition (0.34×10 -7 M) from the Figure 6, and reconstructed the TiO 2 -Au hybrid systems onto flexible stainless steel (SS) substrates instead of FTO substrates (sample photo presented in inset of Figure 7). 80 The j-v characteristics of Au-TiO 2 -SS and Au-N-TiO 2 -SS electrodes were tested in 0.5M Na 2 SO 4 aqueous electrolyte with three electrode PEC cell step up. The j-v characteristic of N-TiO 2 -Au-SS is displayed in Figure 7 (a).…”

mentioning

confidence: 99%

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Modulating the interaction between gold and TiO₂nanowires for enhanced solar driven photoelectrocatalytic hydrogen generation

Sudhagar

Song

Devadoss

et al. 2015

Phys. Chem. Chem. Phys.

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The interaction strength of Au nanoparticles with pristine and nitrogen doped TiO 2 nanowire surface was analysed using density functional theory and their significance in enhancing the solar driven photoelectrocatalytic properties was elucidated. In this article, we prepared 4-dimethylaminopyridine capped Au nanoparticles decorated TiO 2 nanowires system. The density functional theory calculations show {101}facets of TiO 2 as the preferred phase for dimethylaminopyridine-Au nanoparticles anchoring 10 with a binding energy of -8.282 kcal/mol. Besides, the interaction strength of Au nanoparticles was enhanced nearly four-fold (-35.559 kcal/mol) at {101} facets via nitrogen doping, which indeed amplified the Au nanoparticle density on nitrided TiO 2 . The Au coated nitrogen doped TiO 2 (N-TiO 2 -Au) hybrid electrodes show higher absorbance owing to the light scattering effect of Au nanoparticles. In addition, N-TiO 2 -Au hybrid electrodes block the charge leakage from electrode to electrolyte and thus reduce the 15 charge recombination at electrode/electrolyte interface. Despite the beneficial band narrowing effect of nitrogen in TiO 2 on the electrochemical and visible light activity in N-TiO 2 -Au hybrid electrodes, it results low photocurrent generation at higher Au NPs loading (3.4×10 -7 M) due to light blocking to NTiO 2 surface. Strikingly, even with a ten-fold lower Au NPs loading (0.34×10 -7 M), the synergistic effects of nitrogen doping and Au NPs on N-TiO 2 -Au hybrid system yield high photocurrent compare to TiO 2 20 and TiO 2 -Au electrodes. As a result, N-TiO 2 -Au electrode produces nearly 270 µmol/hr cm -2 hydrogen, which is nearly two-fold higher than the pristine TiO 2 counterpart. The implications of these findings for the design of efficient hybrid photoelectrocatalytic electrodes are discussed.

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Nitrogen-doped titanium dioxide photocatalysts for visible response prepared by using organic compounds

Cited by 293 publications

References 18 publications

Catalytic Degradation of Organic Dyes using Synthesized Silver Nanoparticles: A Green Approach

Catalytic Degradation of Organic Dyes using Synthesized Silver Nanoparticles: A Green Approach

Influence of the chemical synthesis on the physicochemical properties of N-TiO2 nanoparticles

Modulating the interaction between gold and TiO₂nanowires for enhanced solar driven photoelectrocatalytic hydrogen generation

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Nitrogen-doped titanium dioxide photocatalysts for visible response prepared by using organic compounds

Cited by 293 publications

References 18 publications

Catalytic Degradation of Organic Dyes using Synthesized Silver Nanoparticles: A Green Approach

Catalytic Degradation of Organic Dyes using Synthesized Silver Nanoparticles: A Green Approach

Influence of the chemical synthesis on the physicochemical properties of N-TiO2 nanoparticles

Modulating the interaction between gold and TiO2nanowires for enhanced solar driven photoelectrocatalytic hydrogen generation

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Modulating the interaction between gold and TiO₂nanowires for enhanced solar driven photoelectrocatalytic hydrogen generation