Highly active small Pd nanocatalyst obtained by visible-light-induced photo-reduction with citrate and oxalate salts under batch and flow approaches

2022 ◽  
Author(s):  
E. Daniella Díaz-Vázquez ◽  
Silvia M. Soria-Castro ◽  
Irina Della-Cagnoletta ◽  
Sandra Elizabeth Martín ◽  
Gabriela Oksdath-Mansilla ◽  
...  
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Aqueous Media ◽  
Highly Active ◽  
Photochemical Method

A fast, economical and straightforward photochemical method was developed to produce small Pd-PVP NPs in aqueous media at room temperature. The photochemical approach involved the use of a combination of...

scholarly journals Comparison of the photocatalytic efficacy and environmental impact of CdS, ZnFe2O4, and NiFe2O4 under visible light irradiation

2021 ◽  
Vol 83 (5) ◽  
pp. 993-1004
Author(s):  
Xiaoyu Wang ◽  
Susan J. Masten ◽  
Elaheh Esfahanian
Keyword(s):  
Environmental Impact ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Life Cycle Analysis ◽  
Room Temperature ◽  
Catalyst Surface ◽  
Sol Gel ◽  
Aqueous Media ◽  
Preparation Methods ◽  
Light Spectra

Abstract Three photocatalysts (CdS, ZnFe2O4, and NiFe2O4) were synthesized and their ability to photodegrade methylene blue (MB) was evaluated. MB was degraded by both spinel photocatalysts under visible light at room temperature, although their efficacy was less than that for CdS. The photocatalytic efficacies of NiFe2O4 were observed to be much greater than that for ZnFe2O4. All the synthesized nanoparticles absorbed visible light, while CdS had a larger absorption range within the visible light spectra and the most porous surface. Photo-deactivation was observed during the study, which could be due to the chemical adsorption of the degraded products on the catalyst surface. The factors that affected MB removal efficacy include the absorption range of photocatalysts, initial MB concentrations, amount of photocatalysts added, and photoreactor conditions. Life cycle analysis was used to compare the preparation methods of the photocatalysts in terms of energy consumption and environmental impact. The results showed that the hydrothermal method for NiFe2O4 preparation was less energy-intensive than the sol-gel method for CdS and ZnFe2O4 as the hydrothermal method is effective over a wider range of temperatures in aqueous media. Also, as ZnFe2O4, and NiFe2O4 have lower environmental impacts than CdS both show promise as photocatalysts.

Visible-light initiated copper(i)-catalysed oxidative C–N coupling of anilines with terminal alkynes: one-step synthesis of α-ketoamides

2015 ◽  
Vol 17 (2) ◽  
pp. 1113-1119 ◽  
Author(s):  
Arunachalam Sagadevan ◽  
Ayyakkannu Ragupathi ◽  
Chun-Cheng Lin ◽  
Jih Ru Hwu ◽  
Kuo Chu Hwang
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Biologically Active ◽  
Terminal Alkynes ◽  
Photochemical Method ◽  
One Step

A green photochemical method is reported for synthesis of biologically active α-ketoamides at room temperature using commercially available substrates.

Carbon nitride supported AgPd alloy nanocatalysts for dehydrogenation of formic acid under visible light

2017 ◽  
Vol 5 (14) ◽  
pp. 6382-6387 ◽  
Author(s):  
Liping Xiao ◽  
Young-Si Jun ◽  
Binghui Wu ◽  
Deyu Liu ◽  
Tracy T Chuong ◽  
...  
Keyword(s):  
Formic Acid ◽  
Visible Light ◽  
Carbon Nitride ◽  
Room Temperature ◽  
Ambient Condition ◽  
Alloy Nanoparticles ◽  
Highly Active ◽  
One Step ◽  
The One ◽  
Temperature Preparation

We report a facile approach for the one-step room-temperature preparation of nearly monodisperse AgPd alloy nanoparticles supported on semiconductor graphitic carbon nitride (g-CN). The AgPd/g-CN nanocatalysts are highly active and durable for dehydrogenation of formic acid under visible light or dark at ambient condition.

Temperature Dependence of the Self-Assembled Styrene Based Random Ionomers in Aqueous Solution

2003 ◽  
Vol 775 ◽  
Author(s):  
Sung-Hwa Oh ◽  
Ju-Myung Song ◽  
Joon-Seop Kim ◽  
Hyang-Rim Oh ◽  
Jeong-A Yu
Keyword(s):  
Partition Coefficients ◽  
Room Temperature ◽  
Aqueous Media ◽  
The Self ◽  
Spectroscopic Methods ◽  
Ion Content ◽  
Repeat Units ◽  
Notable Effect ◽  
Order Of Magnitude ◽  
Experimental Errors

AbstractSolution behaviors of poly(styrene-co-sodium methacrylate) were studied by fluorescence spectroscopic methods using pyrene as a probe. The mol% of methacrylate was in the range 3.6–9.4. Water and N,N-dimethylforamide(DMF) mixture was used as a solvent (DMF/water = 0.2 mol %). The critical micelle (or aggregation) concentrations of ionomers and the partition coefficients of pyrene were obtained the temperature range 10–80°C. At room temperature, the values of CMCs (or CACs) were in the range 4.7 ×10-6 5.3 ×10-6 g/mL and we could not find any notable effect of the content of ionic repeat units within the experimental errors. Unlike CMCs, as the ion content increased, partitioning of pyrene between the hydrophobic aggregates and an aqueous media decreased from 1.5 ×105 to 9.4 ×104. As the temperature increased from 10 to 80 °C, the values of CMCs increased less than one order of magnitude. While, the partition coefficients of pyrene decreased one order of magnitude and the effect of the ion content became negligible.

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