Photonic crystal enhancement of Raman scattering

2020 ◽  
Vol 22 (17) ◽  
pp. 9630-9636
Author(s):  
Matin Ashurov ◽  
Alexander Baranchikov ◽  
Sergey Klimonsky
Keyword(s):  
Methylene Blue ◽  
Raman Scattering ◽  
Enhancement Factor ◽  
Stop Band ◽  
Blue Dye ◽  
Inverse Opal ◽  
Methylene Blue Dye ◽  
Spontaneous Raman Scattering ◽  
Metal Free ◽  
Photonic Stop Band

Inverse opal films impregnated with a methylene blue dye were prepared by a template route. Photonic stop band governs amplitude of spontaneous Raman scattering peaks for metal-free photonic crystals, enhancement factor being over 50.

Surface-enhanced Raman scattering in ETPTA inverse photonic crystals with gold nanoparticles

2021 ◽  
Vol 23 (36) ◽  
pp. 20275-20281
Author(s):  
Matin Ashurov ◽  
Bakhodur Abdusatorov ◽  
Alexander Baranchikov ◽  
Sergey Klimonsky
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Stop Band ◽  
Laser Wavelength ◽  
Inverse Opal ◽  
Photonic Stop Band ◽  
Composite Substrate ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The detection limit of methylene blue of about 10−7 M was achieved by measuring Raman scattering of light at a laser wavelength that coincides with the photonic stop band of a composite substrate consisting of inverse opal with gold nanoparticles.

scholarly journals Removal of methylene blue dye by solvothermally reduced graphene oxide: a metal-free adsorption and photodegradation method

RSC Advances ◽  
2019 ◽  
Vol 9 (64) ◽  
pp. 37686-37695 ◽  
Author(s):  
Valerie Ling Er Siong ◽  
Kian Mun Lee ◽  
Joon Ching Juan ◽  
Chin Wei Lai ◽  
Xin Hong Tai ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Dye Removal ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Metal Free ◽  
Removal Process ◽  
Uv Photodegradation ◽  
Reduced Graphene

A metal-free MB dye removal process was carried out by solvothermally synthesized rGO. After optimization, near-complete dye removal was achieved via an adsorption and UV photodegradation route.

Using of modified-bentonite as low-cost sorbent for removal of methylene blue dye from aqueous solution

2020 ◽  
Vol 27 (2) ◽  
pp. 45-54
Author(s):  
Saraa Muwafaq Ibrahim ◽  
Ziad T. Abd Ali
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Silanol Group ◽  
Infrared Spectrometry ◽  
Blue Dye ◽  
Ammonium Bromide ◽  
Vibration Band ◽  
Order Kinetic ◽  
Methylene Blue Dye ◽  
Modified Bentonite

Batch experiments have been studied to remove methylene blue dye (MB) from aqueous solution using modified bentonite. The modified bentonite was synthesized by replacing exchangeable calcium cations in natural bentonite with cationic surfactant cetyl trimethyl ammonium bromide (CTAB). The characteristics of modified bentonite were studied using different analysis such as Scanning electronic microscopy (SEM), Fourier transform infrared spectrometry (FTIR) and surface area. Where SEM shows the natural bentonite has a porous structure, a rough and uneven appearance with scattered and different block structure sizes, while the modified bentonite surface morphology was smooth and supplemented by a limited number of holes. On other hand, (FTIR) analysis that proved NH group aliphatic and aromatic group of MB and silanol group are responsible for the sorption of contaminate. The organic matter peaks at 2848 and 2930 cm-1 in the spectra of modified bentonite which are sharper than those of the natural bentonite were assigned to the CH2 scissor vibration band and the symmetrical CH3 stretching absorption band, respectively, also the 2930 cm-1 peak is assigned to CH stretching band. The batch study was provided the maximum removal efficiency (99.99 % MB) with a sorption capacity of 129.87 mg/g at specified conditions (100 mg/L, 25℃, pH 11 and 250rpm). The sorption isotherm data fitted well with the Freundlich isotherm model. The kinetic studies were revealed that the sorption follows a pseudo-second-order kinetic model which indicates chemisorption between sorbent and sorbate molecules.

Adsorption Studies of Methylene Blue Dye using Biosorbents

2018 ◽  
Vol 8 (3) ◽  
pp. 502-513
Author(s):  
Saravanan Narayanan ◽  
Rathika Govindasamy
Keyword(s):  
Methylene Blue ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Adsorption Studies

scholarly journals Characterization and use of a lignin sample extracted from Eucalyptus grandis sawdust for the removal of methylene blue dye

2021 ◽  
Vol 170 ◽  
pp. 375-389
Author(s):  
Alexandra Cemin ◽  
Fabrício Ferrarini ◽  
Matheus Poletto ◽  
Luis R. Bonetto ◽  
Jordana Bortoluz ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Eucalyptus Grandis ◽  
Blue Dye ◽  
Methylene Blue Dye

scholarly journals Highly Porous and Ultra-Lightweight Aero-Ga2O3: Enhancement of Photocatalytic Activity by Noble Metals

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1985
Author(s):  
Irina Plesco ◽  
Vladimir Ciobanu ◽  
Tudor Braniste ◽  
Veaceslav Ursaki ◽  
Florian Rasch ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Noble Metals ◽  
Hybrid Structures ◽  
Blue Dye ◽  
Light Illumination ◽  
Methylene Blue Dye ◽  
Visible Light Illumination ◽  
New Type ◽  
Highly Porous

A new type of photocatalyst is proposed on the basis of aero-β-Ga2O3, which is a material constructed from a network of interconnected tetrapods with arms in the form of microtubes with nanometric walls. The aero-Ga2O3 material is obtained by annealing of aero-GaN fabricated by epitaxial growth on ZnO microtetrapods. The hybrid structures composed of aero-Ga2O3 functionalized with Au or Pt nanodots were tested for the photocatalytic degradation of methylene blue dye under UV or visible light illumination. The functionalization of aero-Ga2O3 with noble metals results in the enhancement of the photocatalytic performances of bare material, reaching the performances inherent to ZnO while gaining the advantage of the increased chemical stability. The mechanisms of enhancement of the photocatalytic properties by activating aero-Ga2O3 with noble metals are discussed to elucidate their potential for environmental applications.

Sign in / Sign up

Export Citation Format

Share Document