Cao Enjuan, Duan Wenzhen, Wang Aiqin, Zheng Yian
Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China.
Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
Chemosphere. 2017 Mar;171:223-230. doi: 10.1016/j.chemosphere.2016.12.087. Epub 2016 Dec 19.
A facile polymerization of m-phenylenediamine (mPD) in methanol/water (50:50, v/v) was performed via conventional chemical oxidative method by using Calotropis gigantea fiber (CGF) as the natural biotemplate. The as-prepared CGF oriented poly(m-phenylenediamine) (PmPD), i.e. CGF-O-PmPD, exhibits a well defined fiber-oriented morphology. The presence of PmPD layer enables CGF-O-PmPD to present roughen surface with N-rich functional groups that can show high performance for the adsorption of ciprofloxacin. The variables affecting the adsorption capacity were systematically investigated, including contact time, initial concentration, initial pH, ion strength, and so forth. The experimental data reveal that with increasing the amount of mPD from 0.2, 0.5 to 2.0 g, the adsorption capacity for ciprofloxacin shows a monotonic decrease, while the adsorption kinetics show a monotonic increase, with the adsorption percentage from >50%, >60% to >70% within 10 s, demonstrating its superfast adsorption kinetics for ciprofloxacin. In addition, an increasing adsorption capacity is observed over the pH range studied, with the adsorption capacity from 0.73 to 6.7 mg g at pH 2.0 to 64.9-77.3 mg g at pH 10.0. After five adsorption-desorption cycles, the adsorption capacity of CGF-O-PmPD for ciprofloxacin shows no significant decrease, indicating its excellent reusability and potential application in treating antibiotic-containing wastewater.
通过传统化学氧化法，以牛角瓜纤维（CGF）作为天然生物模板，在甲醇/水（50:50，v/v）中进行间苯二胺（mPD）的简便聚合反应。所制备的CGF取向聚间苯二胺（PmPD），即CGF-O-PmPD，呈现出明确的纤维取向形态。PmPD层的存在使CGF-O-PmPD具有富含氮官能团的粗糙表面，对环丙沙星具有高性能的吸附能力。系统研究了影响吸附容量的变量，包括接触时间、初始浓度、初始pH值、离子强度等。实验数据表明，随着mPD用量从0.2、0.5增加到2.0 g，环丙沙星的吸附容量单调下降，而吸附动力学单调增加，在10 s内吸附百分比从>50%、>60%增加到>70%，表明其对环丙沙星具有超快的吸附动力学。此外，在所研究的pH范围内观察到吸附容量增加，在pH 2.0时吸附容量为0.73至6.7 mg/g，在pH 10.0时为64.9 - 77.3 mg/g。经过五次吸附-解吸循环后，CGF-O-PmPD对环丙沙星的吸附容量没有显著下降，表明其具有优异的可重复使用性以及在处理含抗生素废水方面的潜在应用价值。
