Enhancement of the tartrazine photodegradation by modification of silicon nanowires with metal nanoparticles

Naama, Sabrina; Hadjersi, Toufik; Menari, H.; Nezzal, G.; Ahmed, L. Baba; Lamrani, Sabrina

doi:10.1016/j.materresbull.2015.12.046

Cited by 24 publications

(17 citation statements)

References 21 publications

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“…The silicon wafers were cut up in samples of 10 x 10 mm 2 size. The cleaning of the samples and elaboration of silicon nanowires were made according the processes reported in our previous report [17] . H-terminated SiNWs were obtained by immersing the prepared SiNWs into HF solution for 5 min.…”

Section: Elaboration and Modification Of Silicon Nanowiresmentioning

confidence: 99%

Kinetics of Tartrazine Photodegradation by Cu-Modified Silicon Nanowires

Naama¹,

Hadjersi²,

Menari³

et al. 2018

Res. Rev. J Mat. Sci

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Around 50% of all dye diversity is represented by azo dyes and due to their extensive applications and persistence they pose a clear environmental hazard [1]. Water is an essential natural resource for human being and for all life forms [2,3]. The use of dyes in textile, pharmaceutical, cosmetic and food industries leads to the pollution the wastewaters with different concentrations. Consequently, the reuse of wastewaters has become an absolute necessity. A wide range of methods for the removal of synthetic dyes from wastewaters, including physical adsorption, electrochemical oxidation, and chemical oxidation were proposed. These methods are not destructive and they only transform the pollutant from one phase to another. So, there is an urgent need to develop innovative, more effective and inexpensive techniques for treatment of wastewater [4]. Heterogeneous photocatalytic oxidation, one of the Advanced Oxidation Processes (AOPs), has attracted much attention in recent years and has proved to be a promising technology for remediation of organic pollutants at ambient conditions [5-12]. Photocatalytic oxidation, in the presence of semiconducting materials, of organic compounds with environmental concern was studied extensively during the last 20 years and it was demonstrated that heterogeneous photocatalysis can be an alternative to conventional methods for the removal of organic pollutants from water and wastewater [13]. This process is based on the direct or indirect absorption by a solid, usually a semiconductor, of photons of visible or UV light. When this semiconductor is illuminated, it can generate electron-hole pairs by promoting an electron from the valence band to the conduction band, thus leaving a hole in this band. These holes can react with H 2 O or hydroxyl groups from the reaction medium and produce highly reactive hydroxyl radical species. On the other hand, the electrons promoted to the conduction band, can reduce the molecular oxygen to peroxide anion to form hydrogen peroxide or organic peroxide in presence of organic compounds [14]. Radical hydroxyls are strong oxidizing agents that can degrade organic

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Section: Elaboration and Modification Of Silicon Nanowiresmentioning

confidence: 99%

Kinetics of Tartrazine Photodegradation by Cu-Modified Silicon Nanowires

Naama¹,

Hadjersi²,

Menari³

et al. 2018

Res. Rev. J Mat. Sci

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“…In the last decade, several nanoscale metals have been anchored on SiNWs for catalytic purposes (Au [22,23], Ag [24,25,26], Pd [27,28,29,30], Pt [31,32], Cu [33,34] etc.). Decoration by chemical reduction has been frequently employed, with applications mainly in the degradation of dyes and pollutants [22,24,25,26,27,28,29,30,31,33], but also in cross-coupling reactions [3,27,28,34].…”

Section: Introductionmentioning

confidence: 99%

“…Decoration by chemical reduction has been frequently employed, with applications mainly in the degradation of dyes and pollutants [22,24,25,26,27,28,29,30,31,33], but also in cross-coupling reactions [3,27,28,34]. …”

Section: Introductionmentioning

confidence: 99%

“…Specific chemical transformations were chosen as a benchmark for these materials, ranging from the well-known reductions of nitroarenes [22,23,33] to the relatively unexplored C–N hetero-couplings of aryl halides [34]. Concerning the latter processes, we found, unprecedented in the literature, that gold catalyst (AuNPs@SiNWs) can efficiently promote C aryl –N coupling with amines.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Activity of Silicon Nanowires Decorated with Gold and Copper Nanoparticles Deposited by Pulsed Laser Ablation

et al. 2018

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Silicon nanowires (SiNWs) decorated by pulsed laser ablation with gold or copper nanoparticles (labeled as AuNPs@SiNWs and CuNPs@SiNWs) were investigated for their catalytic properties. Results demonstrated high catalytic performances in the Caryl–N couplings and subsequent carbonylations for gold and copper catalysts, respectively, that have no precedents in the literature. The excellent activity, attested by the very high turn over number (TON) values, was due both to the uniform coverage along the NW length and to the absence of the chemical shell surrounding the metal nanoparticles (MeNPs). A high recyclability was also observed and can be ascribed to the strong covalent interaction at the Me–Si interface by virtue of metal “silicides” formation.

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“…Similar materials have been successfully applied in other fields (e.g. (photo)catalysis and sensing), but their use as SALDI substrates is not fully explored . Moreover, the mentioned studies are relevant to Pt, Cu and Au nanostructures, and no example on AgNP/SiNWs systems for LDI‐MS is yet reported in literature.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of silicon nanowire arrays by silver nanoparticles for the laser desorption ionization mass spectrometry analysis of vegetable oils

et al. 2016

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In this work, novel hybrid nanostructured surfaces, consisting of dense arrays of silicon nanowires (SiNWs) functionalized by Ag nanoparticles (AgNP/SiNWs), were used for the laser desorption/ionization time-of-flight mass spectrometry (LDI-TOF MS) analysis of some typical unsaturated food components (e.g. squalene, oleic acid) to assess their MS performance. The synthesis of the novel platforms is an easy, cost-effective process based on the maskless wet-etching preparation at room temperature of SiNWs followed by their decoration with AgNPs, produced by pulsed laser deposition. No particular surface pretreatment or addition of organic matrixes/ionizers was necessary. Moreover, oil extracts (e.g. extra virgin olive oil, peanut oil) could be investigated on AgNP/SiNWs surfaces, revealing their different MS profiles. It was shown that such substrates operate at reduced laser energy, typically generating intense silver cluster ions and analyte adducts. A comparison with bare SiNWs was also performed, indicating the importance of AgNP density on NW surface. In this case, desorption/ionization on silicon was invoked as probable LDI mechanism. Finally, the influence of SiNW length and surface composition on MS results was assessed. The combination of typical properties of SiNWs (hydrophobicity, antireflectivity) with ionization ability of metal NPs can be a valid methodology for the further development of nanostructured surfaces in LDI-TOF MS applications. Copyright © 2016 John Wiley & Sons, Ltd.

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Enhancement of the tartrazine photodegradation by modification of silicon nanowires with metal nanoparticles

Cited by 24 publications

References 21 publications

Kinetics of Tartrazine Photodegradation by Cu-Modified Silicon Nanowires

Kinetics of Tartrazine Photodegradation by Cu-Modified Silicon Nanowires

Catalytic Activity of Silicon Nanowires Decorated with Gold and Copper Nanoparticles Deposited by Pulsed Laser Ablation

Functionalization of silicon nanowire arrays by silver nanoparticles for the laser desorption ionization mass spectrometry analysis of vegetable oils

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