The advent of nanotechnology has helped in several invention in science & technology. Contamination of surface water, ground and soil by various industrial dyes causes several ecological problems. Zinc oxide nanoparticles as photocatalysts and semiconductor materials show unique physical properties at the nanoscale and can be used to solve these problems to some extent. In this paper, we synthesized ZnO NPs and calcium-coated ZnO nanoparticles using extract of beetroot and then, for industrial point of view, we studied the photocatalytic degradation of methylene blue and rhodamine B using sun as a natural light source (sunlight). We have synthesized calcium-coated ZnO nanocomposites with 20–50 nm particle size. Synthesized nanomaterials were characterized by using the different physio-chemical techniques such as - FT-IR, XRD, TEM, SEM, EDX and UV-spectrophotometer do their photocatalytic degradation. 

Bio-genic Synthesis of Calcium coated Zinc oxide Nanoparticles from Beetroot extract and their photo-degradation study on Methylene Blue and Rhodamine B.

Crystal Phase Refinement and Optical Features of Highly Efficient Green Light Radiating Ca9Y(VO4)7: Er3+ Nanophosphors for Emerging Solid-state Lighting Applications.

Crystal Phase Recognition and Photoluminescence Behavior of Deep Reddish-Orange Sm^3+-Activated Ca_9Gd(VO_4)_7 Nanocrystals for Modern Solid-State Lightings

The reddish-orange emitting Sr6Y2Al4O15:Eu3+ phosphors were synthesized via a high-temperature solid-state reaction technique, and their luminescent properties were systematically studied. The dominant emission peak assigned to the electric dipole transition (5D0 → 7F2) was recorded at 612 nm owing to the non-inversion symmetry of the substituted sites of Eu3+ ions under the excitation of charge transfer band (∼261 nm). The emission of Sr6Y2Al4O15:Eu3+ revealed a Commission Internationale de l'Eclairage (CIE) chromaticity coordinate of (0.571, 0.368) and a color purity of 93.6 %. The thermal stability and photoluminescence quantum yield (PLQY) of Sr6Y2Al4O15: Eu3+ were analyzed, exhibiting a high thermal stability of 88.24 % at 423K and a good external PLQY of 36.24 %. Furthermore, the solid-state lighting (SSL) and flexible anti-counterfeiting applications of Sr6Y2Al4O15:Eu3+ were demonstrated. The red light-emitting diode (LED) was packaged with ∼260 nm ultraviolet LED chip, representing a CIE chromaticity coordinate of (0.5955, 0.3592) and a color purity of 86.53 %. The flexible anti-counterfeiting film was fabricated with polydimethylsiloxane polymer, and it showed tunable emission under different excitations. Moreover, the anti-counterfeiting ink was prepared and printed on various substrates. Consequently, the reddish-orange emitting Sr6Y2Al4O15: Eu3+ phosphors with high color purity, good thermal stability, and high quantum efficiency were introduced and potentially used in SSL and flexible anti-counterfeiting applications. 

High-quality reddish-orange-emitting Sr6Y2Al4O15:Eu3+ phosphors for solid-state lighting and anti-counterfeiting applications

Exploring the orange–red emission from novel vanadate-based nanomaterials for highly innovative photonic applications

Crystallographic and photophysical aspects of combustion derived novel Dy3+-activated BaSrGd4O8 nanophosphor for advanced solid-state lighting applications

Highly efficient ultra-violet-stimulated green-emitting Tb3+ activated Sr6Y2Al4O15 nanocrystalline materials for advanced single-phase pc-WLED fabrication

Uncoated ZnO and calcium-coated ZnO nanoparticles (Ca-ZnO) were biologically synthesized using cucumber juice as a reducing and capping agent. Cucumber belongs to Cucurbitaceae family, is rich in water content and possesses antioxidant activity. The chemical composition and morphology of the synthesized NPs were determined by scanning electron microscopy (SEM), energy dispersive X-ray spectrophotometer (EDS), high-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD)and FT-IR. The spherical as well as hexagonal-shaped ZnO nanoparticles were obtained in the size range of 4-70 nm. Coated and uncoated ZnO nanoparticles were evaluated for their photo degradability of methylene blue (MB) and rhodamine B (RB) dyes. They showed nearly 100% photodegradation of methylene blue in lesser time, however, showed minimum degradation of rhodamine B dye. Calcium coating over ZnO NPs enhanced their photocatalytic properties.

/pdf/photocatalytic-properties-of-biologically-synthesized-lb2zj2mc.pdf

PHOTOCATALYTIC PROPERTIES OF BIOLOGICALLY SYNTHESIZED UNCOATED AND CALCIUM COATED ZnO NANOPARTICLES USING CUCUMBER JUICE

Zinc oxide is considered an effective photocatalyst for degradation of several organic contaminants found in wastewater. This work reports the biological synthesis of zinc oxide nanoparticles and its calcium nanocomposites to study the photocatalytic deterioration of two dyes, viz. Rhodamine B and Methylene blue, under natural sunlight. Nanoparticles were synthesized using zinc acetate and starch extracted from potato at pH 7–8. Potato starch acts as both a capping agent and a reducing agent. They were characterized spectroscopically via XRD, SEM, HR-TEM, EDAX and FT-IR techniques. Bean/spherical shaped ZnO NPs were obtained in the size range of 29–49 nm whereas calcium coating on ZnO decreased the particle size, i.e., 25–35 nm. Their photocatalytic ability to degrade Rhodamine B and Methylene blue was studied under natural sunlight and monitored using UV-Vis spectrophotometer. Synthesized ZnO nanoparticles and its calcium coated ZnO nanocomposites showed promising results in degradation of these dyes. Methylene blue was completely degraded in an hour at 8 mg of the sample. Although degradation of Rhodamine dye was slow, synthesized samples were effective catalysts as compared to the ones reported in the literature.

/pdf/photodegradation-of-methylene-blue-and-rhodamine-b-using-16piche9.pdf

Photodegradation of Methylene blue and Rhodamine B using potato starch mediated zinc oxide nanoparticles and its calcium nanocomposites: Greener approach

Many disorders, both cancerous and non-cancerous, may be effectively treated using photodynamic therapy. In this scenario, photosensitizer drugs are first excited by light of the appropriate wavelength (in the visible-NIR range), after which they transmit their extra energy to molecular oxygen, resulting in the creation of strongly cytotoxic singlet oxygen. Indium oxide nanoparticles are optically transparent materials and can be used to incorporate fluorophores and photosensitizer drugs. Herein, we report the use of indium oxide nanoparticles incorporated with a photosensitizer. These nanoparticles have been synthesized in a methanolic medium. The characterization of prepared nanoparticles included FTIR, XRD, TEM, and optical studies (UV-visible and fluorescence spectroscopy). Cell viability studies demonstrated that the photosensitizer-incorporated nanoparticles showed cytotoxic effects only upon light irradiation. The results indicate the promise of photosensitizer-incorporated indium oxide nanoparticles as delivery agents in photodynamic therapy

/pdf/application-of-photosensitizer-incorporated-indium-oxide-2sylzzxw.pdf

Application of photosensitizer-incorporated indium oxide nanoparticles in photodynamic therapy

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