Department of Conservative Dentistry and Endodontics, Saveetha Dental College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai, 600 077, India.
Department of Physics, KSR College of Engineering, Thiruchengode, 637 215, Tamilnadu, India.
Chemosphere. 2023 Jul;330:138708. doi: 10.1016/j.chemosphere.2023.138708. Epub 2023 Apr 16.
Photocatalytic degradation of azo dyes is seen as a viable technique for addressing environmental and energy concerns simultaneously. Therefore, the primary requirement is the creation of a better catalyst with adequate product selectivity for removal efficiency under solar light. Herein, pure ZnO and Cu (0.10 M) doped cotton stalk activated carbons with ZnO (Cu-doped ZnO/CSAC) were produced, and these are labelled as CZ1, CZ2, CZ3, and CZ3/CSAC, respectively. The optoelectronic and photodegradation efficiencies were examined regarding the impact of doping and loading samples. The XRD patterns confirmed that the CZ3/CSAC sample exhibited a hexagonal wurtzite structure. The XPS survey confirmed that Cu ions were incorporated into the ZnO lattice in a Cu oxidation state. The band gap value (CZ3/CSAC) was reduced (2.38 eV) compared to pure ZnO and CZ3. Moreover, PL and EIS analysis proved more efficient at separating photoinduced charged carriers for CZ3/CSAC than all other samples. The CZ3/CSAC sample showed improved photocatalytic degradation efficiency (93.09%) compared to the pure ZnO and CZ3 samples using brilliant green (BG) dye under sunlight irradiation.
光催化降解偶氮染料被认为是一种可行的技术，可以同时解决环境和能源问题。因此，首要要求是开发出一种更好的催化剂，具有足够的产品选择性，以实现太阳能下的去除效率。在此，制备了纯 ZnO 和 Cu（0.10M）掺杂棉花秸秆活性炭负载 ZnO（Cu 掺杂 ZnO/CSAC），分别标记为 CZ1、CZ2、CZ3 和 CZ3/CSAC。研究了掺杂和负载样品对光电和光降解效率的影响。XRD 图谱证实 CZ3/CSAC 样品具有六方纤锌矿结构。XPS 全谱分析证实 Cu 离子以 Cu 氧化态掺入 ZnO 晶格。与纯 ZnO 和 CZ3 相比，带隙值（CZ3/CSAC）降低（2.38eV）。此外，PL 和 EIS 分析表明，与其他所有样品相比，CZ3/CSAC 更有利于光生载流子的有效分离。与纯 ZnO 和 CZ3 相比，在阳光照射下，使用亮绿（BG）染料时，CZ3/CSAC 样品的光催化降解效率（93.09%）得到提高。
