Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University, Pontianak, Indonesia
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@article{JKSA37169, author = {Muhammad Yusprianto and Titin Zaharah and Imelda Silalahi}, title = {Bandgap Energy of TiO₂/M-Chlorophyll Material (M=Cu²⁺, Fe³⁺)}, journal = {Jurnal Kimia Sains dan Aplikasi}, volume = {24}, number = {4}, year = {2021}, keywords = {chlorophyll; Cu2+-chlorophyll complex; Fe3+-chlorophyll complex; Tauc plot method; bandgap energy}, abstract = {The bandgap energy ( E gap ) of TiO 2 material modified with metal-chlorophyll complex compounds (M = Cu 2+ , Fe 3+ ) was observed. Chlorophyll (Chl) was isolated from cassava leaves, and its UV-Vis spectra showed absorption peaks in the Soret band region (410 nm) and in the Q band region (665 nm), which is the typical peak of chlorophyll. Copper(II)-chlorophyll complex was prepared from the reaction between chlorophyll and CuSO 4 .5H 2 O, while the iron(III)-chlorophyll was synthesized from chlorophyll and FeCl 3 .6H 2 O in methanol solvent under reflux at 65°C. The presence of copperand iron metals in the chlorophyll metal complexes was identified using Atomic Absorption Spectroscopy in methanol solution. The absorption of copper measured in Cu 2+ -Chl was 0.0488 (0.4805 mg/L), while the iron atom in Fe 3+ -Chl was 0.0050 (0.0195 mg/L). The UV-vis spectra demonstrate the hypsochromic shift of the Soret band to 405 nm (Cu 2+ -Chl) and 402 nm (Fe 3+ -Chl). The Infrared spectra of chlorophyll after being complexed with copper(II) shows the increase of vibrational absorption wavenumber of the C=N group from 1225.06 cm -1 to 1241.94 cm -1 indicates the coordination of the metal ion on the N atom in the pyrrole ring. The shift in the absorption band on the Fe 3+ -Chl spectrum was seen for the C=O ester group from 1720.49 cm -1 to 1721.10 cm -1 indicating the metal ion bonding in the C=O group of esters. The DR-UVis analysis of TiO 2 /metal-chlorophyll shows a bathochromic shift towards the visible light region. By using the Tauc plot method, it was observed that the E gap of TiO 2 reduces from 3.08 eV to 2.89 eV and 2.93 eV in the compound of TiO 2 /Cu 2+ -Chl and TiO 2 /Fe 3+ -Chl, respectively.}, issn = {2597-9914}, pages = {126--135} doi = {10.14710/jksa.24.4.126-135}, url = {https://ejournal.undip.ac.id/index.php/ksa/article/view/37169} }
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