Faisal Aimon Hossain, Rahman Khan Mohammad Mizanur, Jeong Jae-Ho
Department of Chemistry, Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh.
Department of Mechanical, Smart and Industrial Engineering, Gachon University-1342, Seongnam-Daero, Sujeong-Gu, Seongnam-Si, Gyeonggi-Do, 13120, Republic of Korea.
Sci Rep. 2025 Jul 1;15(1):21843. doi: 10.1038/s41598-025-05208-5.
L-Serine-ZnS composites were synthesized via a simple solvent casting approach by altering the quantity of added ZnS within a range of 1-5 wt%. The functions of the prepared L-Serine-ZnS composites as photocatalysts with superior performance were evaluated together with the outcomes of morphology, photoluminescence (PL) and thermal properties. The FTIR, UV-visible,HNMR, PL, EDX, and XRD data confirmed the viable integration of ZnS into the L-Serine in L-Serine-ZnS composites. Distinct luminescence properties, thermal stability, and morphological features of the L-Serine-ZnS composites were identified than L-Serine. FESEM micrographs exhibited irregular, nonuniform with different-shaped including sheet-like structures and spherical-shaped morphology for the composites obtained with lower loading of ZnS, while the composite morphology is changed showing a dominating spherical shape structure for higher addition. Nonetheless, for all the composite samples, the diameter remains in the range of 30-600 nm. The XRD analysis demonstrated the average crystallite size of 4.34 nm for the composite sample. TGA data revealed the enhanced thermal stability of composites than L-Serine. The developed composites exhibited exceptional photocatalytic activity against ciprofloxacin (CIP) than L-Serine. Comparative analysis of CIP degradation by L-Serine, ZnS, and composites with detailed kinetic study has been discussed in this work. CIP quantification by HPLC technique also confirmed the consistency of the photocatalytic degradation behavior of composites. Further, the degradation intermediates were recognized utilizing LC-MS technique provided insights into the structural changes during CIP breakdown process. These results may provide a novel understanding regarding the production of L-Serine-ZnS composites utilized as photocatalysts for the remediation of antibiotics from wastewater.
通过简单的溶剂浇铸法，在1-5 wt%的范围内改变ZnS的添加量，合成了L-丝氨酸-ZnS复合材料。评估了所制备的具有优异性能的L-丝氨酸-ZnS复合材料作为光催化剂的功能，以及其形态、光致发光（PL）和热性能的结果。傅里叶变换红外光谱（FTIR）、紫外可见光谱、核磁共振氢谱（HNMR）、PL、能谱分析（EDX）和X射线衍射（XRD）数据证实了ZnS在L-丝氨酸-ZnS复合材料中与L-丝氨酸的有效整合。与L-丝氨酸相比，L-丝氨酸-ZnS复合材料具有独特的发光性能、热稳定性和形态特征。场发射扫描电子显微镜（FESEM）显微照片显示，对于低负载ZnS的复合材料，其形态不规则、不均匀，具有不同形状，包括片状结构和球形形态，而对于较高添加量的复合材料，其形态发生变化，呈现出主要的球形结构。尽管如此，对于所有复合样品，直径仍保持在30-600 nm的范围内。XRD分析表明复合样品的平均微晶尺寸为4.34 nm。热重分析（TGA）数据显示复合材料的热稳定性比L-丝氨酸有所提高。所制备的复合材料对环丙沙星（CIP）表现出比L-丝氨酸更高的光催化活性。本工作讨论了L-丝氨酸、ZnS和复合材料对CIP降解的比较分析以及详细的动力学研究。通过高效液相色谱（HPLC）技术对CIP进行定量分析，也证实了复合材料光催化降解行为的一致性。此外，利用液相色谱-质谱联用（LC-MS）技术识别降解中间体，为CIP分解过程中的结构变化提供了见解。这些结果可能为L-丝氨酸-ZnS复合材料作为光催化剂用于从废水中去除抗生素的生产提供新的认识。
