Anitha A, Ponmurugan P, Arunkumar D, Sumathi C S, Sathishkumar M, Purushothaman T
Department of Botany, Bharathiar University, Coimbatore, Tamil Nadu, India.
Department of Biotechnology, Shri Nehru MahaVidyalaya College of Arts & Science, Coimbatore, Tamil Nadu, India.
Biometals. 2025 Apr;38(2):505-527. doi: 10.1007/s10534-024-00658-2. Epub 2024 Dec 30.
A novel biosynthesis approach was used to develop zinc selenite (ZnSeO) catalysts from the plant extracts of Nephrolepis cordifolia (ZnSeO:NC) and Ziziphus jujube (ZnSeO:ZJ) using hydrothermal method. This study investigates the structural, morphological, and optical properties of pure and biosynthesized ZnSeO catalysts. X-ray diffraction (XRD) analysis confirms the presence of an orthorhombic phase in both catalyst types. Fourier transform infrared spectroscopy (FTIR) reveals the incorporation of secondary metabolites in the biosynthesized ZnSeO catalysts, indicating successful green synthesis. Field-emission scanning electron microscopy (FESEM) demonstrates the formation of needle-shaped nanorod morphology in the prepared catalysts. UV-visible spectroscopy shows a red shift in the optical band gap, with values ranging from 2.40 to 1.60 eV for the biosynthesized ZnSeO catalysts, suggesting enhanced light absorption properties. Barrett-Joyner-Halenda (BJH) analysis highlights the significant influence of plant extract on the surface area of the biosynthesized catalysts. The synthesized ZnSeO catalysts were analyzed for the degradation of Oxytetracycline (OTC) and Rhodamine B (RhB) dyes as well as for their antibacterial activity. Notably, ZnSeO:ZJ catalysts demonstrated enhanced OTC degradation (99%) within 100 min. and RhB dye degradation (99%) within 120 min. The improved kinetic energy, effect of pH, catalysis dosage concentration and scavenger performance for ZnSeO:ZJ catalysts against OTC and RhB dyes compared to pure and ZnSeO:NC photocatalysts. ZnSeO:ZJ exhibits improved growth of inhibition zone against bacterial pathogen B. subtilis (3.30 ± 0.00) followed by E. coli (2.73 ± 0.06). This enhanced degradation efficiency is attributed to the presence of secondary metabolites in the Ziziphus jujube plant extract. These results suggest these catalysts could effectively eliminate wastewater contaminants and innovative antibacterial medications, benefiting the pharmaceutical sector.
采用一种新型生物合成方法，利用水热法从肾蕨（ZnSeO:NC）和枣（ZnSeO:ZJ）的植物提取物中制备亚硒酸锌（ZnSeO）催化剂。本研究考察了纯态及生物合成的ZnSeO催化剂的结构、形态和光学性质。X射线衍射（XRD）分析证实两种催化剂类型均存在正交相。傅里叶变换红外光谱（FTIR）显示生物合成的ZnSeO催化剂中掺入了次生代谢物，表明成功实现了绿色合成。场发射扫描电子显微镜（FESEM）表明所制备的催化剂形成了针状纳米棒形态。紫外可见光谱显示光学带隙发生红移，生物合成的ZnSeO催化剂的值范围为2.40至1.60 eV，表明光吸收性能增强。巴雷特-乔伊纳-哈伦达（BJH）分析突出了植物提取物对生物合成催化剂表面积的显著影响。对合成的ZnSeO催化剂进行了土霉素（OTC）和罗丹明B（RhB）染料降解以及抗菌活性分析。值得注意的是，ZnSeO:ZJ催化剂在100分钟内实现了99%的OTC降解，在120分钟内实现了99%的RhB染料降解。与纯态及ZnSeO:NC光催化剂相比，ZnSeO:ZJ催化剂对OTC和RhB染料的动能、pH值影响、催化剂量浓度和清除剂性能有所改善。ZnSeO:ZJ对细菌病原体枯草芽孢杆菌（3.30±0.00）的抑菌圈生长改善，其次是大肠杆菌（2.73±0.06）。这种提高的降解效率归因于枣植物提取物中次生代谢物的存在。这些结果表明这些催化剂可有效消除废水污染物并开发创新抗菌药物，对制药行业有益。
