抗生素,作为新兴的持久性污染物,对人类健康构成重大威胁。高效、低成本地去除废水中的环丙沙星(CIP)已成为重要的研究热点。在这项研究中,以粉煤灰(FA)为原料,通过改变微波功率制备改性粉煤灰(MFA),碱浓度,和浸泡时间研究其对CIP的吸附特性结果表明,MFA的最佳制备条件对CIP的吸附最有效,使用Box-Behnken响应面方法,微波功率为480瓦,碱浓度为1.5mol/L,和3小时的改性时间。扫描电子显微镜,傅里叶变换红外光谱,和X射线衍射分析表明,改性后,FA的玻璃状结构被破坏,比表面积增加,并出现明显的羟基O-H吸收峰。FA和MFA均表现出符合拟二级动力学和Langmuir方程的CIP吸附过程。在pH=6时实现了CIP的最大吸附(9.61和12.67mg/g)。随着温度的升高,FA和MFA对CIP的吸附能力均下降,表示放热过程。ClP的吸附容量随离子浓度的增加而降低,离子的影响顺序为Al3+>Ca2+>Na+。结果表明,孔隙充填,静电相互作用,离子交换和络合是FA吸附CIP的主要途径。微波碱改性粉煤灰是一种经济高效的去除水中CIP的吸附剂,实现“用废物处理废物”的目的。本研究为控制CIP处理废水提供了科学依据。
Antibiotics, as emerging persistent pollutants, pose significant threats to human health. The effective and low-cost removal of ciprofloxacin (CIP) from wastewater has become an important research focus. In this study, fly ash (FA) was used as the raw material, and modified fly ash (MFA) was prepared by varying microwave power, alkali concentration, and immersion time to investigate its adsorption characteristics for CIP. Results showed that the optimal preparation conditions for MFA with the most effective adsorption of CIP, using the Box-Behnken response surface methodology, were a microwave power of 480 W, an alkali concentration of 1.5 mol/L, and a modification time of 3 h. Scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction analyses revealed that after modification, the glassy structure of FA is destroyed, the specific surface area is increased, and obvious hydroxyl O-H absorption peaks appear. Both FA and MFA exhibited adsorption processes for CIP that conformed to pseudo-second-order kinetics and the Langmuir equation. Maximum adsorption of CIP (9.61 and 12.67 mg/g) was achieved at pH = 6. With increasing temperature, the adsorption capacity of both FA and MFA for CIP decreased, indicating an exothermic process. The adsorption capacity of CIP decreased with increasing ion concentration, with the impact order of ions being Al3+ > Ca2+ > Na+. The results show that pore filling, electrostatic interaction, ion exchange and complexation are the main ways of CIP adsorption by FA. Microwave alkali modified fly ash is an economical and efficient adsorbent for CIP removal in water, realizing the purpose of \"treating waste with waste\". This study provides a scientific basis for controlling CIP treatment in wastewater.