Abstract

In the present study, the adsorption behavior of ciprofloxacin (CIP) from aqueous solution onto MWCNTs/Al₂O₃ was studied using batch experiments. Physical characterization of MWCNTs/Al₂O₃ was determined by SEM, XRD, and BET. The effective parameters investigated included: initial CIP concentration, contact time, MWCNTs/Al₂O₃ mass, and temperature. Based on experimental results and correlation coefficients, the rate of CIP adsorption followed the pseudo-second-model kinetics. Complete compatibility of the adsorption isotherm process was achieved with the Langmuir model, and the maximum adsorption capacity reached 41.73 mg/g under the optimized conditions (pH = 7, MWCNTs/Al₂O₃ dose = 1.2 g/L, contact time = 60 min, initial concentration = 10 mg/L, and temperature= 45 °C). The adsorption capacities based on the Langmuir model at different temperatures, 273, 288, 303, and 318 K, were equal to 72.18, 75.92, 79.65, and 83.47 mg/g, respectively. The determined parameters of the thermodynamic studies demonstrated the endothermic and spontaneous nature of the biosorption. The mean free energy was estimated from D–R isotherm model to be 0.316–0.707 KJ/mol, which clearly proved that the adsorption experiment followed a physical process. The data suggest that MWCNTs/Al₂O₃ could be used as a highly effective adsorbent material with a high capacity for the removal of antibiotics from water and wastewater.

抽象的

在本研究中，使用批处理实验研究了环丙沙星（CIP）从水溶液到MWCNTs / Al ₂ O ₃的吸附行为。MWCNTs / Al ₂ O _3的物理表征通过SEM，XRD和BET确定。研究的有效参数包括：初始CIP浓度，接触时间，MWCNT / Al ₂ O ₃质量和温度。根据实验结果和相关系数，CIP吸附速率遵循伪秒模型动力学。用Langmuir模型可以实现吸附等温线过程的完全相容性，在最佳条件下（pH = 7，MWCNTs / Al），最大吸附量达到41.73 mg / g。₂ O ₃剂量= 1.2 g / L，接触时间= 60分钟，初始浓度= 10 mg / L，温度= 45°C。基于Langmuir模型在273、288、303和318 K的不同温度下的吸附容量分别等于72.18、75.92、79.65和83.47 mg / g。热力学研究确定的参数证明了生物吸附的吸热和自发性质。根据D–R等温线模型估计的平均自由能为0.316–0.707 KJ / mol，这清楚地证明了吸附实验遵循物理过程。数据表明，MWCNTs / Al ₂ O ₃可以用作高效吸附材料，并且具有从水中和废水中去除抗生素的能力。