Catalytic degradation of methyl red using PZnW 11 / m‐Go as a high‐performance photocatalyst

2021 ◽  
Author(s):  
Zahra Shokri Aghbolagh ◽  
Mohammad Saim Rahmatyan ◽  
Mohammad Reza Khanmohammadi Khorrami
Keyword(s):  
High Performance ◽  
Catalytic Degradation ◽  
Methyl Red

scholarly journals Separable Magnetic Fe3O4@MoS2 Composite for Adsorption and Piezo-Catalytic Degradation of Dye

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1403
Author(s):  
Chi Zhou ◽  
Wencheng Liu ◽  
Hanqing Li ◽  
Miao Yang ◽  
Zixin Yang
Keyword(s):  
Rhodamine B ◽  
High Performance ◽  
Catalytic Effect ◽  
Catalytic Degradation ◽  
Structure And Properties ◽  
Superoxide Anions ◽  
Composite Catalysts ◽  
Key Species ◽  
Improved Performance ◽  
Working Mechanisms

Well-designed composite catalysts are of increasing concern due to their improved performance compared to individual components. Herein, we designed and synthesized an Fe3O4@MoS2 composite via a simple hydrothermal method. As for the resultant composite, the MoS2 nanolayers presented a novel piezo-catalytic effect, while the Fe3O4 core provided a magnetic separation property. The structure and properties of Fe3O4@MoS2 were determined by relevant experiments. It was found that Fe3O4@MoS2 exhibited enhanced piezo-catalytic degradation of rhodamine B and good magnetic recovery/recycling features. The kobs for rhodamine B degradation over Fe3O4@MoS2 was 0.019 min−1—a little longer than that over MoS2 (0.013 min−1). Moreover, Fe3O4@MoS2 also showed a favorable ability to adsorb rhodamine B in solution, with a saturation adsorption of 26.8 mg/g. Further studies revealed that piezo-electrons, holes, and superoxide anions were key species in the piezo-catalytic degradation of rhodamine B. Notably, the step where oxygen trapped electrons to produce superoxide anions had a significant impact on the degradation of the dye. This work, not limited to the development of a high-performance MoS2-based piezo-catalyst, is expected to provide new insights into the working mechanisms and process profiles of composite piezo-catalysts.

scholarly journals Isolation Of Mycotoxi genic Fungi And Quantification Of Aflatoxins From Bean Flours Sold In Abeokuta Nigeria

2021 ◽  
Vol 38 (1) ◽  
pp. 68-73
Author(s):  
A.O. Badmos ◽  
S. Olonode ◽  
E.O. Oni ◽  
T.M. Adeleye
Keyword(s):  
Public Health ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Toxin Production ◽  
Potato Dextrose Agar ◽  
Methyl Red ◽  
Recent Increase ◽  
Bean Flour ◽  
Red Flag

The recent increase in consumers’ preference for commercially sold bean flour necessitated the need to determine associated mycoflora and quantify the toxin production by the isolates, since several fungal genera have been associated with bean grains. Four fungal genera were isolated from fifteen beans flour samples sourced from various markets in Abeokuta by serial dilutions and pour plates methods on Potato Dextrose Agar (PDA) plates. Distinct colonies were transferred to Methyl Red Dessicated Coconut Agar (MRDCA) plates to identify toxin- producing isolates and High Performance Liquid Chromatography (HPLC) was used for aflatoxin quantification from the bean flour samples. The isolated fungal genera were, Aspergillus (60%), Fusarium (10%), Rhizopus (15%) and Mucor (5%). Nine of the fifteen samples were found positive for aflatoxigenic organisms and also produced aflatoxins that ranged from 0.006 to 0.151 ng/kg. The presence of toxin- producing organisms in the bean flour which is above the acceptable standard is a red flag that must be addressed vigorously if public health is a priority.

Effect of azo compounds on structure and mechanical properties of copper coating electrodeposited on oxidized aluminum alloys

2021 ◽  
Vol 6 ◽  
pp. 40-59
Author(s):  
D. V. Belov ◽  
◽  
M. V. Maximov ◽  
S. N. Belyaev ◽  
T. I. Devyatkina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Azo Dye ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
Copper Coating ◽  
Azo Compounds ◽  
Methyl Red ◽  
Copper Plating ◽  
Adhesive Properties

This article discusses a new method for producing copper electrolytic coatings with high performance properties applied to oxidized aluminum alloys. The purpose of this work is to reveal the effect of the azo compound additive, methyl red (MR), on the structure and physicomechanical properties of copper coatings deposited on oxidized aluminum. To achieve this goal, the following tasks were solved: the microstructure and adhesive properties of the copper coating formed on oxidized aluminum alloys were determined, and the physical and mechanical properties of the copper coating (microhardness, open porosity, adhesion) were connected with the action of an azo dye in the copper plating electrolyte. Samples of aluminum alloys AD1M and AMg6BM were subjected to anodic treatment under the same conditions in two oxidation electrolytes of various compositions. The process of applying a copper coating to samples of oxidized aluminum alloys was carried out using a standard copper plating electrolyte. The comparison was carried out with a copper plating electrolyte of the same composition, in which an additive of azo dye, methyl red (MR). The use of this technology will not only increase the reliability and durability of machine parts and mechanisms, but also restore old ones, which is an important and relevant scientific and technical task.

scholarly journals Comparative static and shaking culture of metabolite derived from methyl red degradation by Lysinibacillus fusiformis strain W1B6

2019 ◽  
Vol 6 (7) ◽  
pp. 190152 ◽  
Author(s):  
Ira Puspita Sari ◽  
Khanom Simarani
Keyword(s):  
Benzoic Acid ◽  
High Performance ◽  
Degradation Products ◽  
Culture Conditions ◽  
Methyl Red ◽  
Lysinibacillus Fusiformis ◽  
Significant Difference ◽  
Static Conditions ◽  
Azoreductase Activity ◽  
Amino Benzoic Acid

This paper reports on the comparative characteristics and properties of the metabolites derived from methyl red (MR) decolorization by Lysinibacillus fusiformis strain W1B6 under static and shaking conditions. A batch culture system was used to investigate the effect of aeration on azoreductase activity in the biodegradation process, transformation of colour removal and the metabolite products. Biodegradation analysis was monitored using Fourier transform infrared spectroscopy and high-performance liquid chromatography while metabolites were determined using gas chromatography–mass spectroscopy. Phytotoxicity and anti-microbial tests were also conducted to detect the toxicity of metabolites. The results showed that this strain grew more rapidly under shaking conditions while azoreductase activity increased more rapidly under static conditions. Despite that, no significant difference in the decolorization was observed under both static and shaking conditions with up to 96% and 93.6% decolorization achieved, respectively, within 4 h of incubation. MR was degraded into two fragmented compounds, i.e. 2-aminobenzoic acid and N,N -dimethyl-1.4-benzenediamine. The concentration of 2-amino benzoic acid was higher under static conditions resulting the biotransformation of 2-amino benzoic acid into methyl anthranilate more rapidly under static conditions. Other metabolites were also detected as intermediate biotransformation products and by-products. Less or no toxic effect was found in the metabolite degradation products under both culture conditions.

A novel composite membrane for simultaneous separation and catalytic degradation of oil/water emulsion with high performance

Chemosphere ◽  
2022 ◽  
Vol 288 ◽  
pp. 132490
Author(s):  
Linhua Rao ◽  
Xiujia You ◽  
Binghong Chen ◽  
Liguo Shen ◽  
Yanchao Xu ◽  
...  
Keyword(s):  
Composite Membrane ◽  
High Performance ◽  
Catalytic Degradation ◽  
Water Emulsion ◽  
Simultaneous Separation ◽  
Oil Water

scholarly journals Preparation of magnetic imprinted graphene oxide composite for catalytic degradation of Congo red under dark ambient conditions

2017 ◽  
Vol 76 (7) ◽  
pp. 1676-1686 ◽  
Author(s):  
Xiaochao Yang ◽  
Xiaoxiao You ◽  
Bin Zhang ◽  
Chuigen Guo ◽  
Chaosheng Yu
Keyword(s):  
Graphene Oxide ◽  
Congo Red ◽  
High Performance ◽  
Degradation Products ◽  
Low Cost ◽  
Physical Property Measurement System ◽  
Physical Property ◽  
Catalytic Degradation ◽  
Degradation Efficiency ◽  
Ambient Conditions

Magnetic imprinted N-doped P25/Fe3O4-graphene oxide (MIGNT) was prepared with methyl orange as the dummy template and pyrrole as functional monomer for catalytic degradation of Congo red (CR). Hummers method and the hydrothermal method were used to synthesize Fe3O4-GO and N-doped P25, respectively. The results of adsorption and degradation experiments showed that the adsorption capacity and catalytic degradation ability of the imprinted composite for CR were obviously higher than those of a non-imprinted one. Moreover, the effect factors on degradation efficiency of CR, such as the initial concentration of CR, catalysis time, pH of the solution and temperature, were investigated. The MIGNT was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, a physical property measurement system and a thermal gravimetric analyzer. The degradation products of CR were detected with high performance liquid chromatography and a mass spectrometer. The MIGNT was a brand-new imprinted composite and had high degradation efficiency for CR under dark ambient conditions. The MIGNT could be recycled conveniently, due to its magnetic property, and could be used as an effective, environmentally friendly and low-cost catalytic degradation material for the treatment of water contaminated by CR.

Assembly synthesis of Cu2O-on-Cu nanowires with visible-light-enhanced photocatalytic activity

2015 ◽  
Vol 44 (35) ◽  
pp. 15645-15652 ◽  
Author(s):  
Hanxing Chen ◽  
Teng Tu ◽  
Ming Wen ◽  
Qingsheng Wu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
High Performance ◽  
Catalytic Degradation ◽  
Aquatic Environments ◽  
Cu Nanowires ◽  
Dye Pollutants ◽  
Potential Applications ◽  
Visible Light Driven

The designed visible-light-driven Cu2O-on-Cu nanowire photocatalysts exhibit high-performance catalytic degradation of dye pollutants, suggesting potential applications in aquatic environments.

scholarly journals Highly Sensitive and Full Range Detectable Humidity Sensor using PEDOT:PSS, Methyl Red and Graphene Oxide Materials

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Gul Hassan ◽  
Memoon Sajid ◽  
Changhwan Choi
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Humidity Sensor ◽  
Full Range ◽  
Active Material ◽  
Active Regions ◽  
Methyl Red ◽  
Active Materials ◽  
Highly Sensitive ◽  
In Series

Abstract Single transducer with humidity sensing materials has limitations in both range and sensitivity, which cannot be used to detect the full range of humidity with consistent sensitivity. To enlarge range and improve sensitivity in the all range relative humidity (RH), we propose a highly sensitive and full range detectable humidity sensor based on multiple inter-digital transducer (IDT) electrodes connected in series with poly(3,4-ethylenedioxythiophene) doped poly (styrene sulfonate) anions (PEDOT: PSS), C15H15N3O2 (Methyl Red), and graphene oxide (GO) thin films as the active sensing materials. The humidity sensor with single active material has a limit in the detecting ranges, where the GO, PEDOT: PSS, and Methyl Red materials have sensing responses of 0 to 78% RH, 30 to 75% RH, and 25 to 100% RH, respectively. However, a humidity sensor using combined three active materials can respond to much wider range of RH with high sensitivity, where the IDTs and the active regions were prepared using ink-jet printing and spin coating, respectively. This proposed sensor can detect a full range of 0% RH to 100% RH. The response and recovery times are 1 sec and 3.5 sec, respectively. Our single sensing device using multiple IDTs connected different active materials in series can overcome the limitations of single transducer based sensor for the high performance sensor applications.

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

Sign in / Sign up

Export Citation Format

Share Document