Salah Heba, Shehata Nabila, Khedr Noha, Elsayed Khaled N M
Environmental Science and Industrial Development Department, Faculty of Postgraduate Studies for Advanced Sciences, Beni-Suef University, Beni-Suef, 62511, Egypt.
Renewable Energy Science and Engineering Department, Faculty of Postgraduate Studies for Advanced Sciences, Beni-Suef University, Beni-Suef, 62511, Egypt.
Microb Cell Fact. 2024 Dec 17;23(1):329. doi: 10.1186/s12934-024-02591-y.
Pharmaceutical residues, now recognized as a new category of environmental pollutants, have potentially risks to both ecosystems and human health effects. Recently, biosorption has emerged as one of the most promising strategies for managing these pharmaceutical wastes in water. Nevertheless, the environmental impact of the adsorbents presents a challenge to the advancement of this process. Therefore, the present study proposed two biosorbent: Chlorella vulgaris and Synechocystis sp. microalgae to manage Ciprofloxacin (CIP) in water. The experimental findings revealed that the optimal conditions for adsorption conditions are CIP initial concentration 4.0 mg/L and pH 5 and 3 for Synechocystissp. and C. vulgaris, respectively. The adsorption process followed the Pseudo-second-order kinetic model. The main mechanism of biosorption is the complexation of CIP with carboxyl, hydroxyl, carbonyl, and amido groups which was confirmed by Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDX) analyses. These analyses confirmed the presence of CIP on the surface of tested microalgal cells. These results indicated that the adsorption mechanism of CIP by Synechocystis sp. PCC6803 and C. vulgaris offers theoretical insights into the biosorption mechanisms of pharmaceutical residues.
药物残留如今被视为一类新型环境污染物，对生态系统和人类健康均存在潜在风险。近来，生物吸附已成为处理水中这些药物废弃物最具前景的策略之一。然而，吸附剂对环境的影响给这一工艺的发展带来了挑战。因此，本研究提出了两种生物吸附剂：普通小球藻和聚球藻微藻，用于处理水中的环丙沙星（CIP）。实验结果表明，吸附条件的最佳值分别为：聚球藻的CIP初始浓度4.0 mg/L，pH值5；普通小球藻的CIP初始浓度4.0 mg/L，pH值3。吸附过程遵循准二级动力学模型。生物吸附的主要机制是CIP与羧基、羟基、羰基和酰胺基的络合作用，傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和能量色散X射线光谱（EDX）分析证实了这一点。这些分析证实了CIP存在于受试微藻细胞表面。这些结果表明，聚球藻PCC6803和普通小球藻对CIP的吸附机制为药物残留的生物吸附机制提供了理论见解。
