Photocatalytic degradation of dyes using starchassisted pure and doped WO3 nanoparticles

Simple item page
dc.contributor.advisorJoshi, G. C.
dc.contributor.authorTiwari, Manjula
dc.date.accessioned2024-08-14T10:04:12Z
dc.date.available2024-08-14T10:04:12Z
dc.date.issued2024-07
dc.description.abstractThe present study deals with pure and starch-assisted pure and (Mn, Co, and Mo) doped WO3 nanoparticles for the degradation of dyes in the presence of sunlight. The natural polymer (starch) has been used as stabilizing agent to synthesize pure and (Mn, Co, and Mo) doped WO3 nanoparticles by co-precipitation process. XRD, FESEM, FTIR, UV-VIS and PL spectroscopy have been used to study the attributes of synthesized WO3 nanoparticles. XRD analysis demonstrated that the WO3 nanoparticles prepared in starch media show a small average crystallite size compared to WO3 nanoparticles prepared without starch. It was observed that starch acts as a growth-regulating agent as well as dopants (Mn, Co, and Mo) do not affect the crystal structure of WO3. FESEM analysis shows that starch-assisted pure and doped nanoparticles show a more homogeneous and porous structure than WO3 nanoparticles synthesized without starch. On increasing the concentration of the dopant, the average diameter of doped nanoparticles decreases. The inclusion of Mn and Co dopants does not affect the morphology of WO3, while Mo doping produced a change in the morphology of WO3. With the help of UV-VIS technique, it has been observed that the increase in dopant concentration narrows the bandgap energy. The defects generated on the surface of the synthesized samples were analyzed by PL spectroscopy technique. Starch produced large crystallographic defects on the WO3 nanoparticle surfaces, which increased the rate of charge carrier separation. A comparison of starch-assisted pure and (Mn, Co, and Mo) doped-WO3 for the degradation of organic dyes (Rhodamine-B and Crystal Violet) from the wastewater in the presence of sunlight revealed that Modoped WO3 nanoparticles show the highest photocatalytic activity as compared to the pure, Mn, and Co-doped WO3 nanoparticles. From the present study, it is observed that starch can be used as a suitable stabilizer for the synthesis of pure and doped WO3 nanoparticles. Also, it has been observed that doping is an effective strategy for modifying the properties of WO3 nanoparticles and enhancing the photocatalytic activity of the synthesized samples.
dc.identifier.citationTheses of Ph.D
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810213244
dc.language.isoEnglish
dc.pages120 p.p.
dc.publisherG. B. Pant University of Agriculture & Technology, Pantnagar-263145
dc.relation.ispartofseries10851
dc.subPhysics
dc.themeAcademic Research
dc.these.typePh.D
dc.titlePhotocatalytic degradation of dyes using starchassisted pure and doped WO3 nanoparticles
dc.typeThesis
Files
Original bundle
Now showing 1 - 2 of 2
No Thumbnail Available
Name:
Manjula Tiwari, Id. No. 54044, Ph.D..pdf
Size:
12.37 MB
Format:
Adobe Portable Document Format
Download
No Thumbnail Available
Name:
Manjula Tiwari, Id. No. 54044, Ph.D..pdf
Size:
12.37 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Theses