Photocatalytic Conversion of Xylose to Xylitol over Copper Doped Zinc Oxide Catalyst

Rohini, B.; Hebbar, H. Umesh

doi:10.1007/s10562-020-03499-z

Cited by 13 publications

(1 citation statement)

References 37 publications

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“…Addition of several dopants with the transition materials improves the electrical characteristics by decreasing resistivity and boosting photocatalytic activity [21,22]. Transition metals (Co, Fe, Ni, and Cu) have been studied as potential dopants for photocatalysis applications [23,24]. The divalent Copper (Cu) ion is one of the intriguing dopant, has unique properties like comparable ionic radius with zinc (Cu 2+ = 0.73 A, Zn 2+ = 0.74 A).…”

Section: Introductionmentioning

confidence: 99%

Enhancement in photo sensing and photocatalytic degradation activity of Cu doped ZnO nanoparticles prepared by co-precipitation method

Ganesh,

Yahia,

Raj

et al. 2023

Phys. Scr.

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In the present work, Copper (Cu) doped zinc oxide (ZnO) nanoparticles were prepared using a simple and cost-effective co-precipitation process. The objectives of the proposed work are to identify the cause of Cu dopant on the crystalline structure, morphology, optical characteristics of ZnO nanoparticles for photocatalytic as well as photosensing applications. X-ray diffraction (XRD) and Field emission scanning electron microscope (FESEM) examinations were used to identify the crystal structure and morphology of the prepared samples. The crystallite size of the undoped ZnO sample was 44 nm, which gets reduced to 36 nm with 5% Cu-doping. Using diffuse reflectance spectroscopy (DRS), the band gap of prepared samples of undoped to 5wt% Cu doped ZnO was calculated, and it was found to be reduced from 3.31 to 3.26 eV. Photoluminescence (PL) spectra show a decrease in luminous intensity which is in line with the photocatalytic behavior. 5 wt% Cu doped ZnO sample displayed maximum degradation efficiency of 85% in 75 minutes and degradation rate of 0.02 min-1. Additionally, photo-sensing studies of the 5 wt. % Cu doped ZnO sample showed higher responsivity (R), detectivity (D*) and external quantum efficiency (EQE) values of 1.93  10-1 AW-1, 1.09  1011 Jones and 45 % respectively. The rise and fall time of 5 wt % Cu doped ZnO photodetector is in the order of 0.3 and 0.5 s.

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Section: Introductionmentioning

confidence: 99%

Enhancement in photo sensing and photocatalytic degradation activity of Cu doped ZnO nanoparticles prepared by co-precipitation method

Ganesh,

Yahia,

Raj

et al. 2023

Phys. Scr.

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Formic and lactic acids from the conversion of xylose with the use of modified clinoptilolite by sonication

Sobuś,

Król

2024

J of Chemical Tech & Biotech

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BACKGROUNDA material of natural origin, clinoptilolite, was modified with selected metals in order to obtain a catalyst for the conversion of xylose – the main component of the hemicellulose fraction present in lignocellulosic biomass – to selected carboxylic acids.RESULTSThe starting material without modification (0‐parent), the hydrogen form (0‐hydrogen) of zeolite and zeolite after hierarchization with hydrochloric acid (0‐dealuminated) were used. Iron, copper and cobalt ions were introduced as active centers using the sonication technique. The catalytic process was carried out in a pressure autoclave for 2 h at a temperature of 220 °C. Compounds such as formic acid with a yield of 91% (0‐parent) and lactic acid with a yield of 66.1% (Fe‐hydrogen) were obtained.ConclusionThe catalytic processes carried out using xylose lead to the obtaining of a mixture of carboxylic acids: lactic acid, pyruvic acid and formic acid. An important role here is played by the presence of iron as an active site, which leads to the transformation of xylose into lactic acid by dehydration, and the presence of Lewis and Brønsted active sites. In the case of formic acid, which has never been reported in publications on a similar topic, the starting zeolite without modification contributed to its preparation. It is possible that the content of alkali metals contributed to its preparation along with the coupling of the oxidation reaction of the intermediate product, because of the presence of small amounts of iron, which are present in the natural material. © 2024 Society of Chemical Industry (SCI).

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Sonophotocatalysis for Enhanced Extraction of Corn Cob Xylan and Simultaneous Production of Xylose and Xylooligosaccharides

Rohini,

Hebbar

2024

Waste Biomass Valor

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Photocatalytic Conversion of Xylose to Xylitol over Copper Doped Zinc Oxide Catalyst

Cited by 13 publications

References 37 publications

Enhancement in photo sensing and photocatalytic degradation activity of Cu doped ZnO nanoparticles prepared by co-precipitation method

Enhancement in photo sensing and photocatalytic degradation activity of Cu doped ZnO nanoparticles prepared by co-precipitation method

Formic and lactic acids from the conversion of xylose with the use of modified clinoptilolite by sonication

Sonophotocatalysis for Enhanced Extraction of Corn Cob Xylan and Simultaneous Production of Xylose and Xylooligosaccharides

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