Spinach Extract Derived Carbon Dots Decorated on ZnO Nanorods for Photocatalytic Dye Degradation

2021 ◽  
Vol 13 (5) ◽  
pp. 922-926
Author(s):  
Sia Won ◽  
Jong-Sung Kim
Keyword(s):  
Carbon Dots ◽  
Near Infrared ◽  
Organic Dyes ◽  
Dye Degradation ◽  
Zno Nanorods ◽  
Infrared Region ◽  
Blue Dye ◽  
Analytical Instruments ◽  
First Order Kinetics ◽  
Spinach Extract

The carcinogenic and mutagenic nature of organic dyes makes their removal from dye-containing wastewaters essential prior to the discharge of such wastewaters. We synthesized carbon dots having emission wavelengths in the near-infrared region from spinach extract. Thereafter, CDs were embedded on ZnO nanorods through hydrothermal treatment. The prepared ZnO doped with CDs were characterized by various analytical instruments and used to photocatalytically degrade methylene blue dye under sunlight. The as-prepared ZnO exhibited nanorod morphology, with the CDs doped on its surface. The dye degradation followed pseudo-first-order kinetics; the ZnO doped with CDs synthesized at pH 10 achieved the highest dye degradation, with a kinetic coefficient of 0.02889 min−1. This study shows that the photocatalytic efficiency of ZnO can be effectively improved by doping with CDs.

scholarly journals A Palette of Efficient and Stable Far-Red and NIR Dye Lasers

2020 ◽  
Vol 10 (18) ◽  
pp. 6206
Author(s):  
Edurne Avellanal-Zaballa ◽  
Leire Gartzia-Rivero ◽  
Jorge Bañuelos ◽  
Inmaculada García-Moreno ◽  
Antonia R. Agarrabeitia ◽  
...  
Keyword(s):  
Spectral Region ◽  
Near Infrared ◽  
Laser Emission ◽  
Organic Dyes ◽  
Infrared Region ◽  
Dye Lasers ◽  
Spectral Window ◽  
Conformationally Restricted ◽  
The One ◽  
New Generation

The disposal of long-wavelength-emitting sources is of paramount relevance in technology and biophotonics due to the low interference with the surroundings that these kinds of far-red and near-infrared radiations hold. As a result of the continued efforts carried out during the last few years by our research group to design new boron-dipyrromethene (BODIPY) dyes with improved photonic performance, two approaches were tested to develop a new generation of organic dyes able to display efficient and long-lasting laser emission in both target spectral regions. On the one hand, the annulation of aromatic benzofuran at the dipyrrin backbone leads to conformationally restricted dyes yielding photostable and bright laser emission beyond 600 nm at the far-red spectral region. On the other hand, a more pronounced shift to longer wavelengths reaching 725 nm at the near-infrared region is feasible, while keeping a reasonably high laser efficiency and tolerance to prolonged and intense pumping, based on aza-BODIPYs bearing peripheral aryl rings. These two complementary strategies yield a library of laser-emitting compounds comprising the 600–725 nm spectral region. Moreover, their laser performance is better than the commercially available dye lasers active in this spectral window.

scholarly journals Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1560 ◽  
Author(s):  
Zhili Peng ◽  
Yiqun Zhou ◽  
Chunyu Ji ◽  
Joel Pardo ◽  
Keenan J. Mintz ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Carbon Dots ◽  
Organic Dyes ◽  
Dye Degradation ◽  
Average Diameter ◽  
Spherical Particles ◽  
Promising Alternative ◽  
Excellent Photocatalytic Activity ◽  
Doped Carbon Dots

Carbon dots (C-dots) were facilely fabricated via a hydrothermal method and fully characterized. Our study shows that the as-synthesized C-dots are nontoxic, negatively charged spherical particles (average diameter 4.7 nm) with excellent water dispersion ability. Furthermore, the C-dots have a rich presence of surface functionalities such as hydroxyls and carboxyls as well as amines. The significance of the C-dots as highly efficient photocatalysts for rhodamine B (RhB) and methylene blue (MB) degradation was explored. The C-dots demonstrate excellent photocatalytic activity, achieving 100% of RhB and MB degradation within 170 min. The degradation rate constants for RhB and MB were 1.8 × 10−2 and 2.4 × 10−2 min−1, respectively. The photocatalytic degradation performances of the C-dots are comparable to those metal-based photocatalysts and generally better than previously reported C-dots photocatalysts. Collectively considering the excellent photocatalytic activity toward organic dye degradation, as well as the fact that they are facilely synthesized with no need of further doping, compositing, and tedious purification and separation, the C-dots fabricated in this work are demonstrated to be a promising alternative for pollutant degradation and environment protection.

scholarly journals Synthesis of silver-loaded ZnO nanorods and their enhanced photocatalytic activity and photoconductivity study

2019 ◽  
Vol 18 (6) ◽  
pp. 1503-1511 ◽  
Author(s):  
Prashant V. Pimpliskar ◽  
Shrinivas C. Motekar ◽  
Govind G. Umarji ◽  
Wonyoung Lee ◽  
Sudhir S. Arbuj
Keyword(s):  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Photocatalytic Activity ◽  
Dye Degradation ◽  
Zno Nanorods ◽  
Blue Dye ◽  
Methylene Blue Dye

The photocatalytic activity of ZnO nanorods towards methylene blue dye degradation was enhanced by loading 0.5, 1, 5, and 10 mol% silver nanoparticles on the ZnO.

Enhanced Photocatalytic Activity of St-ZnO Nanorods for Methylene Blue Dye Degradation

2022 ◽  
pp. 131637
Author(s):  
Devaraj Bharathi ◽  
Thiruvengadam Nandagopal Jaya Ganesh ◽  
Ranjithkumar Rajamani ◽  
Soumya Pandit ◽  
Deepak Kumar ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Dye Degradation ◽  
Zno Nanorods ◽  
Blue Dye ◽  
Methylene Blue Dye

Synthesis and Characterization of ZnO Doped with Gold Nanoparticles for Improved Photocatalytic Activity

2021 ◽  
Vol 13 (5) ◽  
pp. 944-948
Author(s):  
Juyoung Yu ◽  
Jongsung Kim
Keyword(s):  
Gold Nanoparticles ◽  
Photocatalytic Activity ◽  
Organic Dyes ◽  
Dye Degradation ◽  
Resonance Effect ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Trisodium Citrate ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate

Recently, gold nanoparticles have been widely employed to achieve the activation of the catalytic properties of semiconductors for the decomposition of organic dyes. In this study, gold nanoparticles were prepared by Turke-vich method using HAuCl4 and trisodium citrate dehydrate. gold nanoparticles with size of 18, 20, and 22 nm were prepared by controlling the trisodium citrate dehydrate concentration and reaction time. Furthermore, ZnO nanorods were prepared using zinc nitrate hexahydrate through a hydrothermal process. Finally, ZnO doped with gold nanoparticles nanocomposite photocatalysts were prepared by mixing ZnO and gold nanoparticles and drying at 60 °C. The photocatalytic activity of the nanocomposites was evaluated through the degradation of Rhodamine B dye under solar light. ZnO doped with 22 nm of gold nanoparticles showed the highest photocatalytic activity, providing up to 78.6% dye degradation. The highest photocatalytic activity of the ZnO doped with 22 nm of gold nanoparticles nanocomposite was probably due to the increased surface plasmon resonance effect of the gold nanoparticles.

scholarly journals Microwave-Assisted Synthesis and Characterization of Solar-Light-Active Copper–Vanadium Oxide: Evaluation of Antialgal and Dye Degradation Activity

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 36
Author(s):  
Sondavid Nandanwar ◽  
Shweta Borkar ◽  
Jeong Hyung Cho ◽  
Hak Jun Kim
Keyword(s):  
Methylene Blue ◽  
Vanadium Oxide ◽  
Mechanism Of Action ◽  
Near Infrared ◽  
Dye Degradation ◽  
Algal Growth ◽  
Solar Light ◽  
Blue Dye ◽  
Microwave Assisted Synthesis ◽  
Ft Ir

In this work, solar-light-active copper–vanadium oxide (Cu-VO) was synthesized by a simple microwave method and characterized by FESEM, EDS, XRD, XPS, UV–Vis/near-infrared (NIR), and FT-IR spectroscopy. Antialgal and dye degradation activities of Cu-VO were investigated against Microcystis aeruginosa and methylene blue dye (MB), respectively. The mechanism of action of Cu-VO was examined regarding the production of hydroxyl radical (˙OH) in the medium and intracellular reactive oxygen species (ROS) in M. aeruginosa. FESEM and XRD analyses of Cu-VO disclosed the formation of monoclinic crystals with an average diameter of 132 nm. EDX and XPS analyses showed the presence of Cu, V, and O atoms on the surface of Cu-VO. Furthermore, FT-IR analysis of Cu-VO exposed the presence of tetrahedral VO4 and octahedral CuO6. Cu-VO effectively reduced the algal growth and degraded methylene blue under solar light. A total of 4 mg/L of Cu-VO was found to be effective for antialgal activity. Cu-VO degraded 93% of MB. The investigation of the mechanism of action of Cu-VO showed that ˙OH mediated antialgal and dye degradation of M. aeruginosa and MB. Cu-VO also triggered the production of intracellular ROS in M. aeruginosa, leading to cell death. Thus, Cu-VO could be an effective catalyst for wastewater treatment.

Exhibition of novel photocatalytic activity and photoluminescence properties with high inhibition towards bacterial growth by hydrothermally grown ZnO nanorods

2020 ◽  
Vol 16 ◽  
Author(s):  
Nihar Ranjan Panda ◽  
Dojalisa Sahu
Keyword(s):  
Methylene Blue ◽  
Bacterial Growth ◽  
Organic Dyes ◽  
Zno Nanorods ◽  
Antibacterial Properties ◽  
Crystallographic Structure ◽  
Inhibition Activity ◽  
Electron Microscopic ◽  
Skin Bacteria ◽  
High Inhibition

Background: Metal oxide nanomaterial such as; ZnO shows novel structural, optical, electrical and antibacterial properties due to wide band gap (3.37 eV) and high excitonic binding energy (60 meV). Probing these inherent properties of nanosized ZnO with different morphology has generated new interest among researchers Objective: To investigate the size dependent functional attributes, ZnO nanorods were prepared by hydrothermal method and the photocatalytic (PC) efficiency was studied. The photoluminescence (PL) property of ZnO nanorods was also studied by recording the emission spectrum under photo-excitation. These nanorods (NRs) were coated on cotton fabric to study the effectiveness of these NRs in defending and inhibiting the growth of different bacteria Methods: The crystallographic structure and morphology of the ZnO samples were investigated by X-ray diffraction (XRD) and field emission scanning electron microscopic (FESEM) measurements. PL measurement at room temperature was undertaken by exciting the sample with light of wavelength 350 nm. The PC property of ZnO NRs was studied in degrading organic dyes like methylene blue. Bacteria like Staphylococcus aureus, Escherichia coli and Bacillus subtilis were cultured and the inhibition of growth of these bacteria was studied by the application of ZnO. To enhance the microbe defence mechanism of fabric, we coated these NRs on fabric test samples and investigated the bacterial growth on it. Results: XRD and FESEM studies reveal the dimension of the synthesized products in nano range. These nanorods are of high density and surface roughness as per the FESEM study. PL measurement shows the presence of strong UV emission at 382 nm with defect emissions in the blue-green region opening up the path for ZnO to be used in fabrication of optoelectronic devices. PC study reveals that 89% degradation of methylene blue (MB) dye is achievable in 180 min using these ZnO catalysts. The anti-bacterial study shows that the minimum inhibitory concentration (MIC) of ZnO nanorods coated on the fabric against S. aureus is found to be 3.5 mg/ml which is the minimum as compared to E. coli (7.5 mg/ml) and B. subtilis (5.5 mg/ml). The study further enunciates that fabric coated with ZnO samples exhibited considerably high inhibition activity toward S. aureus. Conclusion: The study shows that ZnO NRs can be effectively used for fabrication of UV-LASER/LED. Photocatalytic efficiency of ZnO will be useful for degradation of organic dyes controlling environment pollution. It further enunciates that fabric coated with ZnO samples exhibited considerably high inhibition activity toward S. aureus (skin bacteria) which will be helpful in defending microbes if used in surgical cotton bandages

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