PHOTOCATALYTIC DEAGRADATION OF RHODAMINE B DYE USING Mn DOPED ZnO NANOPARTICLES
2022
hudu, Abdurrahman | Muhammad, A.S.
ABSTRACTIn the present work, the impact of Mn-doped ZnO on photocatalytic activity of ZnO nanoparticles and potential antimicrobial properties was studied. ZnO and Mn-doped ZnO were successfully synthesized by precipitation and co-precipitation method, respectively. The catalysts were characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD) energy dispersive X-ray (EDX) spectroscopy and pH at point of zero charge. The structural and optical properties of the nanoparticles elucidated that the Mn2+ ions have substituted the Zn2+ ions without changing the wurtzite structure of ZnO. The band gap energy of ZnO and Mn-doped ZnO were found to be 3.15 and 2.77 eV respectively. The pH at point of zero charge for undoped and doped ZnO were found to be 9.1 and 7.5 respectively. The photocatalytic activity of synthesized ZnO and Mn doped ZnO NPs on degradation of RB dyes were examined. Photocatalytic studies revealed that the maximum percentage degradation RB is 73%.This indicates that the doping of Mn generally leads to enhanced photocatalytic activity of ZnO. Photodegradation of RB were fitted into pseudo zero order, pseudo first order and pseudo second order models and pseudo-first-order kinetics best fitted.
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