John Daphne Mary, Kaaliveetil Sreerag, Nair Yadhu J, Sruthy S, Lasya P, Thoopul Srinivasa Raghava Ramanujam Brahmadesam, Sivasubramanian G, Sreedhar K M, Sreekanth K M
Department of Physics, Amrita School of Physical Sciences Coimbatore, Amrita Vishwa Vidyapeetham, 641112, India.
Advanced Multifunctional Materials and Analysis Laboratory (AMMAL), School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, 641112, India.
Heliyon. 2024 Nov 30;10(23):e40833. doi: 10.1016/j.heliyon.2024.e40833. eCollection 2024 Dec 15.
This work looks into how well Cu-doped zinc oxide works as a photocatalyst when exposed to visible light to break down sulphanilamide. The synthesized samples were characterized by XRD and then FTIR techniques for structural besides compositional analysis. The approximate value of bandgap found out by NBE values of PL spectra showed a decrease in bandgap with doping. Deconvoluted PL spectra revealed the presence of radiative recombination pathways associated with zinc interstitial and zinc vacancy in addition to band-to-band recombination in all samples. FESEM images showed a nanoflake shape for pure ZnO, while Cu-ZnO had a pseudo-spherical shape. SQUID-VSM was adopted to understand the magnetic nature of freshly prepared, heated, and unheated aged samples. Ferromagnetic behavior was observed with saturation magnetization of 5.56 × 10, 2.88 × 10, and 2.78 × 10 emu/g for freshly prepared, heated, and unheated aged samples, respectively. A 2 % Cu-doped sample exhibited the highest efficiency of 92.3 % towards the degradation of sulphanilamide. Since we got better efficiency for 2 % Cu-ZnO, we should further decrease the doping percentage and check whether we will get even higher efficiency in the future. The photocatalytic degradation efficiency of ternary ZnO compounds, codoped ZnO, should be evaluated, yet another future scope.
这项工作研究了掺杂铜的氧化锌在可见光照射下作为光催化剂分解磺胺的效果。通过XRD对合成样品进行表征，然后采用FTIR技术进行结构和成分分析。通过PL光谱的NBE值得出的带隙近似值表明，掺杂后带隙减小。去卷积后的PL光谱显示，除了所有样品中的带间复合外，还存在与锌间隙和锌空位相关的辐射复合途径。FESEM图像显示纯ZnO为纳米片状，而Cu-ZnO为假球形。采用SQUID-VSM来了解新制备的、加热的和未加热老化样品的磁性。对于新制备的、加热的和未加热老化的样品，分别观察到铁磁行为，其饱和磁化强度分别为5.56×10、2.88×10和2.78×10 emu/g。2%铜掺杂的样品对磺胺降解表现出最高效率，为92.3%。由于2% Cu-ZnO具有更高的效率，我们应进一步降低掺杂百分比，并检查未来是否能获得更高的效率。三元ZnO化合物（共掺杂ZnO）的光催化降解效率也应进行评估，这是另一个未来的研究方向。
