Enhanced photocatalytic degradation of Safranin-O by heterogeneous nanoparticles for environmental applications

El‐Kemary, Maged; Abdel-Moneam, Yasser K.; Madkour, Metwally; El‐Mehasseb, Ibrahim M.

doi:10.1016/j.jlumin.2010.10.025

Cited by 80 publications

(29 citation statements)

References 34 publications

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“…Hence the produced radicals can only react where they are formed. Increase in the dye concentration significantly increases the probability of collision between the dye molecules and hydroxyl radicals that can lead to the increase in decolorization efficiency [56]. But at high concentrations the occupied positions on the catalyst surface by the dye molecules can limit the available active sites for photons.…”

Section: Effect Of Phmentioning

confidence: 99%

Effect of the supported ZnO on clinoptilolite nano-particles in the photodecolorization of semi-real sample bromothymol blue aqueous solution

Bahrami

Nezamzadeh‐Ejhieh

2015

Materials Science in Semiconductor Processing

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Section: Effect Of Phmentioning

confidence: 99%

Effect of the supported ZnO on clinoptilolite nano-particles in the photodecolorization of semi-real sample bromothymol blue aqueous solution

Bahrami

Nezamzadeh‐Ejhieh

2015

Materials Science in Semiconductor Processing

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“…It is an effective and rapid technique in the removal of pollutants from wastewater [3]. In the recent years, numerous metal oxides including TiO 2 [4], ZnO [5], and other oxides have attracted growing attentions for photodegradation of organic dyes; TiO 2 is of particular interests due to its low cost and high stability. Nonetheless, TiO 2 has a relatively large energy band-gap and only absorbs UV region, while the UV lights only contribute to less than 10% of total solar radiations; the visible lights, on the other hand, contribute to 50% of the solar radiations.…”

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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“…The positive effect of the ZnS on the photoactivity of Degussa's P25 may be due to the electronic interaction taking place at the region where the TiO 2 and the metal sulfide come into contact. [2] This leads to the Biotechnologically obtained nanocomposites removal of electrons from TiO 2 to the vicinity of the semiconductor, resulting in an improved charge separation. [42] In other words, a more effective electron transfer occurs than in the case of pure TiO 2 , although, for the composite ZnS-TiO 2 _0.02, an exception was observed.…”

Section: Nanocomposites Characterizationmentioning

confidence: 99%

“…[1] In the textile industry, dyes must be highly stable and resistant to washing, light and microbial activity. [2] Hence, these effluents are not easily degraded and are not removed from water by conventional biological treatments. [3] Photocatalytic degradation using semiconductors is an effective technique that results in fast oxidation of the pollutants [4] and is therefore considered a promising and greener technology for the removal of toxic compounds.…”

Section: Introductionmentioning

confidence: 99%

Biotechnologically obtained nanocomposites: A practical application for photodegradation of Safranin-T under UV-Vis and solar light

Costa

Girão

Monteiro

et al. 2015

Journal of Environmental Science and Health, Part A

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This research was undertaken to determine the potential of biologically obtained ZnS-TiO2 nanocomposites to be used as catalysts in the photodegradation of organic pollutants, namely, Safranin-T. The photocatalysts were prepared by modifying the surface of commercial TiO2 particles with naturally produced ZnS, using sulfide species produced by sulfate-reducing bacteria and metal contaminated wastewaters. Comparative studies using powder X-ray diffraction (XRD) and scanning electron microscopy (SEM), prior and after photodegradation, were carried out in order to monitor possible structural and morphological changes on the particles. Adsorption properties and specific areas were determined by the Brunauer-Emmet-Teller (BET) method. The final solutions were characterized by UV-Vis and chemical oxygen demand (COD) content in order to determine Safranin-T concentration and toxicity. The influence of the catalyst amount, initial pH and dye concentration was also evaluated. Finally, the efficiency of the precipitates as catalysts in sunlight-mediated photodegradation was investigated, performing two scale experiments by using different volumes of dye-contaminated water (150 mL and 10 L). All tested composites showed potential to be used as photocatalysts for the degradation of Safranin-T, although the ZnS-TiO2_0.06 composite (0.06 g of TiO2 per 50 mL of the zinc solution) was the most effective. This substantiates the applicability of these biologically obtained materials as efficient photocatalysts for the degradation of organic pollutants, in laboratorial conditions and under direct sunlight.

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Enhanced photocatalytic degradation of Safranin-O by heterogeneous nanoparticles for environmental applications

Cited by 80 publications

References 34 publications

Effect of the supported ZnO on clinoptilolite nano-particles in the photodecolorization of semi-real sample bromothymol blue aqueous solution

Effect of the supported ZnO on clinoptilolite nano-particles in the photodecolorization of semi-real sample bromothymol blue aqueous solution

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

Biotechnologically obtained nanocomposites: A practical application for photodegradation of Safranin-T under UV-Vis and solar light

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