scholarly journals Effect of Pluronic P103 Concentration on the Simple Synthesis of Ag and Au Nanoparticles and Their Application in Anatase-TiO2 Decoration for Its Use in Photocatalysis

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 127
Author(s):  
Frida Karem Rivas-Moreno ◽  
Adan Luna-Flores ◽  
Daniel Cruz-González ◽  
Valeria Jordana González-Coronel ◽  
Manuel Sánchez-Cantú ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Au Nanoparticles ◽  
Anatase Tio2 ◽  
Bet Surface Area ◽  
Soft Template ◽  
Reaction Conditions ◽  
Au Nps ◽  
Methylene Blue Degradation ◽  
Vis Spectroscopy ◽  
Metal Polymer

Silver and gold nanoparticles were synthesized under environmentally-friendly reaction conditions by using a biodegradable copolymer and water as a solvent. The triblock copolymer Pluronic P103 was utilized as a stabilizing agent or soft template to produce Ag and Au nanoparticles (NPs) of different sizes. Moreover, in the synthesis of Au NPs, the polymer acted as a reducing agent, decreasing the number of reagents used and consequently the residues produced, hence, rendering the procedure less complicated. It was observed that as the concentration of the polymer increased, the size of the metallic NPs augmented as well. However, AgNPs and AuNPs prepared with 1 and 10 wt% Pluronic P103, respectively, showed a significant decrease in particle size due to the presence of polymeric soft templates. The hybrid materials (metal/polymer) were characterized by UV-Vis spectroscopy, DLS, and TEM. The pre-synthesized nanoparticles were employed to decorate anatase-TiO2, and the composites were characterized by DRS, XRD, BET surface area measurements, the TEM technique with the EDS spectrum, and XPS spectroscopy to demonstrate NPs superficial incorporation. Finally, methylene blue was used as a probe molecule to evidence the effect of NPs decoration in its photocatalytic degradation. The results showed that the presence of the NPs positively affected methylene blue degradation, achieving 96% and 97% removal by utilizing TAg0.1 and TAu10, respectively, in comparison to bare anatase-TiO2 (77%).

scholarly journals A facile soft template method to synthesize hollow carbon and MnOx composite particles for effective methylene blue degradation

RSC Advances ◽  
2018 ◽  
Vol 8 (50) ◽  
pp. 28525-28532 ◽  
Author(s):  
Qingnan Meng ◽  
Lulu Du ◽  
Yeye Ji ◽  
Yufei Tang ◽  
Zhenhua Han ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Formation Mechanism ◽  
Soft Template ◽  
Template Method ◽  
Composite Particles ◽  
Methylene Blue Degradation ◽  
Hollow Carbon

Hollow carbon and MnOx composite particles were synthesized for catalytic use and their formation mechanism was proposed.

Detection of Cytochrome C Using a Selective and Sensitive Methylene Blue-Based Electrochemical Aptasensor

2020 ◽  
pp. 1-8
Author(s):  
Mohadeseh Safaei ◽  
Hadi Beitollahi ◽  
Masoud Reza Shishehbore
Keyword(s):  
Methylene Blue ◽  
Detection Limit ◽  
Cytochrome C ◽  
Au Nanoparticles ◽  
Sandwich Immunoassay ◽  
Electrochemical Aptasensor ◽  
Au Nps ◽  
Peak Current ◽  
Aptamer Probe

The present research aimed to detect the cytochrome C using methylene blue (MB)-anchored ultrasensitive electrochemical aptamer conjugated with Au nanoparticles (NPs), as a new electrochemical sandwich immunoassay. Aptamer-Au NPs could act as sandwich amplification element and MB accumulation reagent. According to the results, the interaction of MB and guanine occurred strongly on aptamer probe. After switching the aptamer structure by the cytochrome C, the MB- labeled aptamer probe was forced to detach from the sensing interface. Moreover, the cytochrome C concentrations (0.05-10.0 µM) with 5.0 nM detection limit reduced linearly the peak current of MB. In conclusion, an acceptable selectivity was observed for the constructed aptasensor in detecting the cytochrome C.

Enhanced Photocatalytic Degradation of Methylene Blue by Using Au-TiO2

2019 ◽  
Vol 886 ◽  
pp. 107-113
Author(s):  
Pongthep Jansanthea ◽  
Weerasak Chomkitichai
Keyword(s):  
Methylene Blue ◽  
Average Crystallite Size ◽  
Average Diameter ◽  
Single Step ◽  
Flame Spray ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Au Nps ◽  
Transmission Electron ◽  
Excellent Photocatalytic Activity

In this work, Au-TiO2 nanoparticles (NPs) were synthesized in a single step by flame spray pyrolysis (FSP) method. X-ray diffraction (XRD) results indicated that phase structures of all samples TiO2 were the mixture of anatase and rutile phases. High resolution transmission electron microscopy (HRTEM) showed that dark spots of Au NPs deposited on larger TiO2 nanoparticles. HRTEM results indicated TiO2 NPs were average crystallite size in the range of 10–30 nm whereas the average diameter of Au NPs was about 5–10 nm. UV–Vis absorption spectroscopy technique showed peaks attributable of surface plasmon resonance (SPR) to Au NPs loaded on TiO2 in the wavelength of 500–630 nm. The Au-TiO2 NPs showed excellent photocatalytic activity for the degradation of methylene blue (MB) under UV-Vis irradiation. It was found that 0.25 mol% Au-TiO2 which was a better photocatalyst than others under the same reaction conditions. The results showed that Au NPs-loading could effectively improve the photocatalytic activities of TiO2.

scholarly journals Stabilizing Ag Nanoparticles Using Anatase TiO2 and Cu on Al Surface

2020 ◽  
pp. 22-30
Author(s):  
Masayoshi Kaneko
Keyword(s):  
Ag Nanoparticles ◽  
Au Nanoparticles ◽  
Active Surface ◽  
Anatase Tio2 ◽  
Sers Substrate ◽  
Ag Nps ◽  
Au Nps ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Chemical adsorption of anatase TiO2, silver nanoparticles (Ag NPs), and Cu particles (Cu Ps) on aluminum (Al) surface yielded an active surface-enhanced Raman scattering (SERS) substrate. TiO2 is known to reduce both silver (Ag) and copper (Cu). In an oxidizing environment, Ag NPs remain unoxidized since Cu has a more negative redox potential than Ag. Ag is therefore protected by Cu from getting oxidized. Although Ag NPs exhibit better SERS activity than Au NPs, Ag is relatively easier to oxidize, limiting the development of Ag-based nanomaterials. Therefore, despite the poor SERS activity of Au nanoparticles than that of Ag nanoparticles, Au nanoparticles have been widely used. Herein, the stabilization of Ag nanoparticles by incorporating a reductive process using anatase TiO2 is reported. The fabricated substrates bearing anatase, Ag NPs, and Cu Ps were stable, as seen by Raman spectra, and remained unchanged for more than 2 months.

Photo-Fenton process in a Co(ii)-adsorbed micellar soft-template on an alumina support for rapid methylene blue degradation

RSC Advances ◽  
2016 ◽  
Vol 6 (103) ◽  
pp. 100876-100890 ◽  
Author(s):  
Prateeksha Mahamallik ◽  
Anjali Pal
Keyword(s):  
Methylene Blue ◽  
Soft Template ◽  
Fenton Process ◽  
Alumina Surface ◽  
Alumina Support ◽  
Methylene Blue Degradation ◽  
First Time

Co(ii)-mediated photo-Fenton degradation of methylene blue was achieved for the first time on the admicellar layer supported on an alumina surface.

scholarly journals Synthesis of Porous Polydimethylsiloxane Gold Nanoparticles Composites by a Single Step Laser Ablation Process

2021 ◽  
Vol 22 (22) ◽  
pp. 12155
Author(s):  
Mariapompea Cutroneo ◽  
Vladimir Havranek ◽  
Anna Mackova ◽  
Petr Malinsky ◽  
Letteria Silipigni ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Laser Ablation ◽  
Au Nanoparticles ◽  
Metal Salt ◽  
Single Step ◽  
Curing Agent ◽  
Step Method ◽  
Au Nps ◽  
Liquid Polymer ◽  
Vis Spectroscopy

Typically, polymeric composites containing nanoparticles are realized by incorporating pre-made nanoparticles into a polymer matrix by using blending solvent or by the reduction of metal salt dispersed in the polymeric matrix. Generally, the production of pre-made Au NPs occurs in liquids with two-step processes: producing the gold nanoparticles first and then adding them to the liquid polymer. A reproducible method to synthetize Au nanoparticles (NPs) into polydimethylsiloxane (PDMS) without any external reducing or stabilizing agent is a challenge. In this paper, a single-step method is proposed to synthetize nanoparticles (NPs) and at the same time to realize reproducible porous and bulk composites using laser ablation in liquid. With this single-step process, the gold nanoparticles are therefore produced directly in the liquid polymer. The optical properties of the suspensions of AuNPs in distilled water and in the curing agent have been analyzed by the UV-VIS spectroscopy, employed in the transmission mode, and compared with those of the pure curing agent. The electrical dc conductivity of the porous PDMS/Au NPs nanocomposites has been evaluated by the I–V characteristics. Scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis have monitored the composition and morphology of the so-obtained composites and the size of the fabricated Au nanoparticles. Atomic force microscopy (AFM) has been used to determine the roughness of the bulk PDMS and its Au NP composites.

scholarly journals Optimization of opeation parameters for methylene blue degradation by UV/TiO2/H2O2 process in an annular reactor

2021 ◽  
Vol 10 (1) ◽  
pp. 40-47
Author(s):  
Chinh Pham Duc ◽  
Cuong Pham Manh ◽  
Thanh Le Phuong ◽  
Trang Nguyen Thi Thu ◽  
Tan Nguyen Minh
Keyword(s):  
Methylene Blue ◽  
Rate Constant ◽  
Reaction Rate ◽  
Great Influence ◽  
Reaction Rate Constant ◽  
Reaction Conditions ◽  
Methylene Blue Degradation ◽  
Annular Reactor ◽  
Apparent Reaction Rate Constant ◽  
Apparent Reaction Rate

In this study, the degradation of methylene blue (MB) by UV/TiO2/ H2O2 process was ivestigated in an annular reactor. The effects of the factors: TiO2 concentration, H2O2 dosage, UV density, and hydrodynamic conditions on the reaction rate constant were evaluated by the response surface methodology. The results showed that TiO2concentration, H2O2dosage and UV density had a great influence on the kapp, hydrodynamics had a lower influence. Design Expert V.11 software is used to optimize the reaction conditions, the optimal apparent reaction rate constant is 0.168 min-1 under the following conditions: TiO2 concentration of 0.2 g/l, H2O2 dosage is 0.063 mol/l, UV density of 287  W/m2 and Re number is 10000.

scholarly journals Study of Methylene Blue Degradation by Gold Nanoparticles Synthesized within Natural Zeolites

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Ericka Rodríguez León ◽  
Eduardo Larios Rodríguez ◽  
César Rodríguez Beas ◽  
Germán Plascencia-Villa ◽  
Ramón Alfonso Iñiguez Palomares
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Methylene Blue Degradation ◽  
X Ray ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Scanning Transmission ◽  
Type Zeolite ◽  
Natural Clinoptilolite

We carried out thein situsynthesis of gold nanoparticles inside a natural clinoptilolite-type zeolite matrix, using ascorbic acid as reducing agent. The microstructure of both zeolite and zeolite-gold nanocomposite was characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Scanning Transmission Electron Microscopy (STEM), and Energy-Dispersive X-ray Spectroscopy (EDS) techniques. Size distribution as assessed by STEM indicated that 60% of gold nanoparticles measured less than 2.5 nm. Determination of the surface area by the BET method revealed a specific value of 27.35 m2/g. The catalytic activity of zeolite-gold regarding methylene blue degradation under different light-exposing conditions was evaluated by UV-Vis spectroscopy. The results indicated that 50% degradation was achieved in only 11 min in presence of sunlight. This reaction was faster in comparison with those obtained using a white LED light. A notable aspect of this study is that catalysis was carried out without the addition of any strong reducing agents, such as sodium borohydride (NaBH4).

scholarly journals Kinetic Studies of Methylene Blue Degradation using CaTiO3 Photocatalyst from Chicken Eggshells

2021 ◽  
Vol 1726 ◽  
pp. 012017
Author(s):  
Lusi Ernawati ◽  
Ade Wahyu Yusariarta ◽  
Andromeda Dwi Laksono ◽  
Ruri Agung Wahyuono ◽  
Hendri Widiyandari ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Kinetic Studies ◽  
Methylene Blue Degradation

scholarly journals Self-Cleaning Polyester Fabric Prepared with TiOF2 and Hexadecyltrimethoxysilane

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 387
Author(s):  
Euigyung Jeong ◽  
Heeju Woo ◽  
Yejin Moon ◽  
Dong Yun Lee ◽  
Minjung Jung ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Contact Angle ◽  
Treatment Method ◽  
Polyester Fabric ◽  
Anatase Tio2 ◽  
The Self ◽  
Water Contact ◽  
Direct Fluorination ◽  
Tomato Ketchup ◽  
Self Cleaning

In this study, self-cleaning polyester (PET) fabrics were prepared using TiOF2 and hexadecyltrimethoxysilane(HDS) treatment. TiOF2 was synthesized via direct fluorination of a precursor TiO2 at various reaction temperatures. The prepared PET fabrics had superior photocatalytic self-cleaning properties compared with anatase TiO2/HDS-treated PET fabrics under UV and sunlight with 98% decomposition of methylene blue. TiOF2/HDS-treated PET fabrics also had superior superhydrophobic self-cleaning properties compared with anatase TiO2/HDS-treated PET fabrics with a 161° water contact angle and 6° roll-off angle. After the self-cleaning tests of the non-dyed TiOF2/HDS-treated PET fabrics, we prepared dyed TiOF2/HDS-treated PET fabrics to test practical aspects of the treatment method. These PET fabrics were barely stained by tomato ketchup; even when stained, they could be self-cleaned within 4 h. These results suggest that practical self-cleaning PET fabrics with superhydrophobicity and photocatalytic degradation could be prepared using TiOF2/HDS-treatment.

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