Extraction, optical properties, and aging studies of natural pigments of various flower plants
S.M. Amir-Al Zumahi,
Nourin Arobi,
Hatem Taha,
Md Kamal Hossain,
Humayun Kabir,
Rummana Matin,
M.S. Bashar,
Farid Ahmed,
Md Abul Hossain,
M. Mahbubur Rahman
Affiliations
S.M. Amir-Al Zumahi
Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh; Bangladesh Atomic Energy Commission, Dhaka 1207, Bangladesh
Nourin Arobi
Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh; Bangladesh Atomic Energy Commission, Dhaka 1207, Bangladesh
Hatem Taha
Department of Physics, College of Education for Pure Science, Ibn Al-Haitham, University of Baghdad, 10071, Baghdad, Iraq
Md Kamal Hossain
Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
Humayun Kabir
Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh; School of Engineering, RMIT University, Bundoora, Victoria 3083, Australia
Rummana Matin
Institute of Fuel Research and Development (IFRD), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka 1205, Bangladesh
M.S. Bashar
Institute of Fuel Research and Development (IFRD), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka 1205, Bangladesh
Farid Ahmed
Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
Md Abul Hossain
Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
M. Mahbubur Rahman
Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh; Discipline of Chemistry and Physics, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA 6150, Australia; Corresponding author.
In this paper, we reported the extraction process of five different flowering plants utilizing different dye extraction methods and solvents (ethanol and water) to choose the best dye removal process. The FTIR spectra revealed the presence of several clear functional groups for all five natural dyes. The analytical studies such as UV spectroscopy, column chromatography, and vacuum evaporation were performed to isolate the dyes from their solutions. The UV-Vis studies on the pigments of flower extracts indicated broad absorption peaks in the visible region including clear bandgaps. Among the studied pigments, Alternanthera ficoidea showed the lowest direct bandgap of 1.69 eV and an Urbach energy value of 6.33 meV. The dye extraction yield rate improvement was extended from 11.7 to 24.7% (water solvent) and 11.3–32.4% (ethanol solvent). Throughout the studies, it was observed that ethanol produced a better extraction for organic dyes than water as a solvent. Aging studies revealed that all the dyes at the room temperature showed better stability with minor changes in the observed optical parameters in oxygen-rich conditions; however, these parameters have shown significant variations at a 60 °C temperature.
