This work evaluated the use of Dialium guineense seed waste (DGS) and its sodium hydroxide modified form (NH-DGS) as biosorbent for ciprofloxacin (CPF) from synthetic solution as well as the desorption potentials. Central composite design (CCD) was applied for optimization of the alkaline treated biosorbent by response surface methodology using design expert. Both biosorbents were characterized by FTIR, SEM, EDX, and BET analysis. The CCD showed NaOH concentration of 0.46 M and temperature of 96 °C to be effective for optimized modification of NH-DGS. Optimum removal of CPF was obtained at pH 6.0, contact time 120 min, temperature 300 K, and dosage of 0.1 g. The Freundlich model gave the best fit compared to the other isotherms tested with R² values >0.97951. NH-DGS exhibited a maximum uptake capacity of 120.34 mg/g higher than some reported adsorbents for CPF. The pseudo-second-order model was suitable in the fitting of the kinetic data. A non-spontaneous process was obtained for CPF biosorption on DGS which became spontaneous after alkaline treatment. Over 84% desorption of CPF was achieved on both biosorbents using 0.3 M HCl which envisaged the use of NH-DGS as an efficient material for treatment of waters contaminated with CPF.

这项工作评估了用杜鹃花种子废料（DGS）及其氢氧化钠修饰形式（NH-DGS）作为合成溶液中环丙沙星（CPF）的生物吸附剂以及解吸潜力的方法。使用设计专家，通过响应表面方法将中央复合设计（CCD）用于优化碱处理的生物吸附剂。两种生物吸附剂均通过FTIR，SEM，EDX和BET分析表征。CCD显示NaOH浓度为0.46 M，温度为96°C，对于优化NH-DGS的改性有效。在pH 6.0，接触时间120分钟，温度300 K和剂量0.1 g的条件下，CPF的去除效果最佳。与使用R ²测试的其他等温线相比，Freundlich模型提供了最佳拟合值> 0.97951。NH-DGS的最大吸收能力比某些报道的CPF吸附剂高120.34 mg / g。拟二阶模型适合动力学数据的拟合。对于CPF在DGS上的生物吸附，获得了非自发过程，该过程在碱处理后自发地发生。使用0.3 M HCl在两种生物吸附剂上均实现了超过84％的CPF解吸，这设想使用NH-DGS作为处理受CPF污染的水的有效材料。