Discharge of antibiotics into the environment can cause problems like increase of the microorganisms’ resistance, disturbing the ecological balance and increasing the allergy in humans. In this research, an activated carbon was produced from filamentous algae and then magnetized with Fe 3 O 4 . The adsorbent size was nano-scale and its characteristics were studied using XRD, FT-IR, FE-SEM, BET and VSM techniques. The response surface method (RSM) was employed to optimize the operating parameters and determine the best conditions for cephalexin removal by novel composite of AC-Fe 3 O 4 . The various parameters in the process, such as reaction time, initial pH, adsorbent dose, initial concentration of cephalexin and effect of cations and anions that could interfere in the adsorption of cephalexin were evaluated in three levels. The proposed quadratic model was found to be best suggested model for the adsorption process (R 2 =0.99094 and $${\rm{R}}_{adj}^2=0.9991$$ R a d j 2 = 0.9991 ). According to results, the parameters such as cephalexin concentration, the adsorbent dose, the reaction time and the pH value were found to be 28.16 mg/L, 2 g/L, 30.04 and 3.02, respectively. Experimental results showed that the adsorption of cephalexin followed Langmuir isotherm (R 2 =0.9803). Also, the results showed cephalexin adsorption on the composite fitted pseudo-second-order kinetics. The study showed that the AC-Fe 3 O 4 adsorbent has high efficacy for eliminating cephalexin from aqueous solution.

中文翻译：

---

丝状藻类活性炭磁性纳米复合材料可有效去除水介质中的头孢氨苄

抗生素排放到环境中会引起微生物耐药性增加、生态平衡紊乱、增加人体过敏等问题。在这项研究中，活性炭由丝状藻类制成，然后用 Fe 3 O 4 磁化。吸附剂尺寸为纳米级，并使用 XRD、FT-IR、FE-SEM、BET 和 VSM 技术研究其特性。采用响应面法 (RSM) 优化操作参数并确定新型 AC-Fe 3 O 4 复合物去除头孢氨苄的最佳条件。对反应时间、初始pH值、吸附剂用量、头孢氨苄初始浓度以及可能干扰头孢氨苄吸附的阳离子和阴离子的影响等过程中的各种参数进行了三个水平的评价。发现提出的二次模型是吸附过程的最佳建议模型（R 2 =0.99094 和 $${\rm{R}}_{adj}^2=0.9991$$ R adj 2 = 0.9991 ）。结果表明，头孢氨苄浓度、吸附剂用量、反应时间和pH值等参数分别为28.16mg/L、2g/L、30.04和3.02。实验结果表明，头孢氨苄的吸附遵循Langmuir等温线(R 2 =0.9803)。此外，结果显示头孢氨苄对复合拟合准二级动力学的吸附。研究表明，AC-Fe 3 O 4 吸附剂对去除水溶液中的头孢氨苄具有高效能。发现头孢氨苄浓度、吸附剂剂量、反应时间和pH值等参数分别为28.16mg/L、2g/L、30.04和3.02。实验结果表明，头孢氨苄的吸附遵循Langmuir等温线(R 2 =0.9803)。此外，结果显示头孢氨苄对复合拟合准二级动力学的吸附。研究表明，AC-Fe 3 O 4 吸附剂对去除水溶液中的头孢氨苄具有高效能。发现头孢氨苄浓度、吸附剂剂量、反应时间和pH值等参数分别为28.16mg/L、2g/L、30.04和3.02。实验结果表明，头孢氨苄的吸附遵循Langmuir等温线(R 2 =0.9803)。此外，结果显示头孢氨苄对复合拟合准二级动力学的吸附。研究表明，AC-Fe 3 O 4 吸附剂对去除水溶液中的头孢氨苄具有高效能。