Wavelength-Regulated Stereodivergent Synthesis of (Z)- and (E)-1,4-Enediones from Phosphonium Ylides

2021 ◽  
Author(s):  
Mei Wang ◽  
Yongqin He ◽  
Yao Zhu ◽  
Zhi-Bin Song ◽  
Xiao-Yu Wang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Functional Groups ◽  
Organic Dye

A wavelength-regulated, organic dye methylene blue catalyzed stereodivergent synthesis of (Z)- and (E)-1,4-enediones from stabilized phosphorous ylides is reported. A broad range of substrates and functional groups are tolerated. Mechanistic...

scholarly journals Transport of Organic Dyes in Systems Containing Humic Acids

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Jan RYBÁRIK ◽  
Petr SEDLÁČEK ◽  
Martina KLUČÁKOVÁ
Keyword(s):  
Methylene Blue ◽  
Organic Matter ◽  
Functional Groups ◽  
Natural Organic Matter ◽  
Humic Acids ◽  
Binding Sites ◽  
Organic Dyes ◽  
Organic Dye ◽  
Active Reaction

This work is focused on transport organic dyes in systems containing humic acids as active reaction agent. Methylene blue was usedas a model organic dye which can behave as pollutant and influence many processes in nature. Transport of pollutants in nature isstrongly affected by interactions with humic acids or natural organic matter. Their influence is dependent on affinity of pollutant tocontent and strength of active binding sites. Two different humic samples are used in this study in order to compare their propertieson transport of organic dye. Both humic acids are used in original extracted form as well as in the form of samples with selectiveblocked functional groups.

The action of rennin on casein: the effect of modifying functional groups on the casein

1965 ◽  
Vol 32 (2) ◽  
pp. 193-201 ◽  
Author(s):  
R. D. Hill ◽  
Raione R. Laing
Keyword(s):  
Methylene Blue ◽  
Amino Acid ◽  
Functional Groups ◽  
Amino Acid Analysis ◽  
Side Chains ◽  
Photo Oxidation

Summaryk-Casein and whole casein when photo-oxidized in the presence of methylene blue lose the ability to clot when treated with rennin. Two effects are involved—first the photo-oxidation alters the k-casein fraction so that the rennin is unable to split off the glycopeptide fragment, and secondly, in whole casein the photo-oxidation interferes with the aggregation in the presence of Ca++that normally follows rennin action. As a result of amino acid analysis and specific treatments which affect other photo-oxidizable side chains, it is concluded that both of these effects are caused by the alteration of histidines.

scholarly journals Effect of synthesis conditions  on  methylene blue adsorption capacity of electrochemically preparated graphene

2020 ◽  
Vol 9 (3) ◽  
pp. 9-14
Author(s):  
Hao Pham Van ◽  
Linh Ha Xuan ◽  
Oanh Phung Thi ◽  
Hong Phan Ngoc ◽  
Huy Nguyen Nhat ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Adsorption Capacity ◽  
Functional Groups ◽  
Photoelectron Spectroscopy ◽  
Graphene Nanosheets ◽  
Electrochemical Exfoliation ◽  
X Ray ◽  
Synthesis Conditions ◽  
Mb Adsorption

This report presents the effect of synthesis conditions on the synthesis of graphene nanosheets via electrochemical exfoliation method for adsorbing methylene blue from aqueous solution. Oxygen-containing functional groups and defects in the material were characterized by Raman and X-ray photoelectron spectroscopy (XPS). As a result, by using voltage of 15 V, (NH4)2SO4 (5%, 250 mL) and KOH (7.5%, 250 mL), the obtained material showed the highest MB adsorption capacity due to the high densities of oxygen-containing groups and defects comparison to other conditions.

Design and synthesis of three new copper coordination polymers: efficient degradation of an organic dye at alkaline pH

2021 ◽  
Vol 50 (39) ◽  
pp. 13866-13876
Author(s):  
Xiaxia Liu ◽  
Liping Lu ◽  
Miaoli Zhu ◽  
Ulli Englert
Keyword(s):  
Methylene Blue ◽  
Coordination Polymers ◽  
Organic Dye ◽  
Alkaline Ph ◽  
Design And Synthesis ◽  
Copper Coordination

New Cu(ii) coordination polymers can efficiently degrade methylene blue in the presence of light and H2O2 at alkaline pH.

TiO2/Graphite Oxide Composite as an Efficient Photocatalyst for Organic Dye Reduction

2013 ◽  
Vol 699 ◽  
pp. 557-559 ◽  
Author(s):  
Rui Zhang ◽  
Yi He Zhang ◽  
Qi An ◽  
Yu Li ◽  
Ji Wu Shang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Graphite Oxide ◽  
Reduction Rate ◽  
Organic Dye ◽  
Deionized Water ◽  
Liquid Phase Deposition ◽  
Tio2 Particles ◽  
Dye Reduction ◽  
Sample Method

A sample method was developed to fabricate composite of TiO2 and graphite oxide by a liquid phase deposition method. (NH4)2TiF6 and H3BO3 were stirred in distilled deionized water to prepare TiO2 particles which were then in situ deposited on graphite oxide. The photograph of scanning electron microscope (SEM) shows that the TiO2 particles are compact and uniform on the surface of graphite oxide sheets. The composite exhibited efficient photocatalytic activity under the ultraviolet light in degrading organic dye of methylene blue. There are two steps in the dye reducing process: the first half hour of porous adsorption by graphite oxide, and the photocatalytic degradation by TiO2 particles. In this case, the methylene blue reduces sharply in the first half hour with the concentration from 10 mg L-1 to 5.8 mg/L. From then, the reduction rate comes down gradually with the concentration of 0.9 mg L-1 after 6 hours UV lighting. The synergism of TiO2 particles and graphite oxide increases the reduction of methylene blue and possesses composite of reutilization ability practically.

scholarly journals Bio-polishing sludge adsorbents for dye removal

2016 ◽  
Vol 18 (4) ◽  
pp. 15-21 ◽  
Author(s):  
Muhammad Abbas Ahmad Zaini ◽  
Norulaina Alias ◽  
Mohd. Azizi Che Yunus
Keyword(s):  
Methylene Blue ◽  
Specific Surface ◽  
Surface Area ◽  
Functional Groups ◽  
Specific Surface Area ◽  
Treatment Strategies ◽  
Blue Dye ◽  
Surface Functional Groups ◽  
Adsorption Capacities ◽  
Maximum Removal

Abstract The objective of this work is to evaluate the removal of methylene blue dye by bio-polishing sludge-based adsorbents. The adsorbents were characterized according to the specific surface area, pH upon the treatment and surface functional groups. The adsorption of dye was carried out at room temperature, and the adsorption data were analyzed using the isotherm and kinetics models. The bio-polishing sludge is rich in ash content, and the presence of surface functional groups varied with the treatment strategies. The specific surface area of adsorbents is between 7.25 and 20.8 m2/g. Results show that the maximum removal of methylene blue by sludge adsorbents was observed to have the following order: untreated sludge (SR) > zinc chloride-treated (SZ) > microwave-dried (SW) = potassium carbonate-treated (SK) > acid-washed (SH). The maximum adsorption capacities for SR and SZ as predicted by the Langmuir model are 170 and 135 mg/g, respectively. Although SR demonstrates a higher maximum removal than SZ, the latter exhibits greater removal intensity and rate constant even at high dye concentration. The bio-polishing sludge is a promising adsorbent for dye wastewater treatment.

scholarly journals Rational design of hierarchical macroporous–mesoporous magnesium silicate for highly efficient removal of organic dye and Pb2+

RSC Advances ◽  
2017 ◽  
Vol 7 (75) ◽  
pp. 47225-47234 ◽  
Author(s):  
Chaoxia Zhao ◽  
Jie Yang ◽  
Bo Jiang
Keyword(s):  
Methylene Blue ◽  
Rational Design ◽  
Magnesium Silicate ◽  
Organic Dye ◽  
Mass Transportation ◽  
Efficient Removal ◽  
Highly Efficient

Magnesium silicate with a hierarchical macroporous–mesoporous nanostructure favours the mass transportation of pollutants and exhibits excellent removal performance for methylene blue and Pb2+.

scholarly journals Sequestration of orange G and methylene blue from aqueous solutions using a Co(ii) coordination polymer

RSC Advances ◽  
2017 ◽  
Vol 7 (43) ◽  
pp. 26532-26536 ◽  
Author(s):  
Cressa Ria P. Fulong ◽  
Timothy R. Cook
Keyword(s):  
Methylene Blue ◽  
Coordination Polymer ◽  
Aqueous Solutions ◽  
Organic Dye ◽  
Dye Molecules ◽  
Orange G

A Co(ii) coordination polymer acts as a sponge for organic dye molecules, removing them from aqueous solutions.

scholarly journals Fabrication, Characterization and Photocatalytic Activity of Copper Oxide Nanowires Formed by Anodization of Copper Foams

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5030
Author(s):  
Alaa M. Abd-Elnaiem ◽  
M. A. Abdel-Rahim ◽  
A. Y. Abdel-Latief ◽  
Ahmed Abdel-Rahim Mohamed ◽  
Kristina Mojsilović ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Organic Compound ◽  
Organic Dye ◽  
Photocatalytic Efficiency ◽  
Voltage Range ◽  
Oxide Nanowires ◽  
Dye Decomposition ◽  
Photocatalytic Decolorization ◽  
Developed Surface

In recent paper anodization of copper foams in 0.1 M K2CO3 is reported. Anodization was performed in the voltage range of 5–25 V and in all the cases oxides with a developed surface area were obtained. However, anodizing only at 20 and 25 V resulted in the formation of nanostruc-tures. In all the cases, the products of anodizing consisted of crystalline phases like cuprite (Cu2O), tenorite (CuO), parameconite (Cu4O3) as well as spertiniite (Cu(OH)2). Copper foams after ano-dizing were applied as catalysts in the photocatalytic decolorization of a model organic compound such as methylene blue. The highest photocatalytic activity was observed for samples anodized at 25 V and closely followed by samples anodized at 5 V. The anodized copper foams proved to be a useful material in enhancing the photocatalytic efficiency of organic dye decomposition.

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