氨化松香基交联聚合树脂对水中诺氟沙星的吸附性能

Evaluation of Performance of an Aminated Rosin-based Resin for Adsorption of Norfloxacin from Aqueous Solutions

将松香基功能高分子进行胺基化得到氨化松香基交联聚合树脂(aminated rosin-based resin,ARBR),采用扫描电镜(SEM)、红外光谱(FTIR)和比表面分析(BET)对ARBR进行了表征.利用ARBR树脂对水中诺氟沙星(NOR)吸附去除,系统研究了树脂投加量、pH值、接触时间、离子强度和温度等因素对NOR吸附性能的影响.结果表明,pH在2.0~6.0范围内,ABRA对NOR的去除效果随着溶液pH值的增加而升高,在8~10之间则呈现下降趋势;共存离子溶液的存在对ARBR去除NOR的行为总体上表现为促进作用.ARBR对水中诺氟沙星的吸附动力学过程符合准二级动力学模型.Langmuir等温吸附模型可较好地描述ARBR对水中NOR的吸附过程,理论最大吸附量为30.29 mg·g^(-1)(pH 6.0、20℃).吸附热力学分析表明,ARBR对水中诺氟沙星的吸附是自发吸热的过程,属于物理吸附,其吸附机制主要为氢键与静电作用.脱附再生实验发现,0.1 mol·L^(-1)HCl溶液效果明显优于其它脱附液,进一步确证了氢键在吸附中的主导作用;经过5次吸附-脱附循环后,对NOR仍具有稳定的吸附性能,可再生循环使用.对比了不同类型商品化树脂,ARBR具有较好的吸附效果.该研究结果拓展了松香高值化的应用研究领域,对开发松香在环境微污染控制中的应用具有理论指导意义.

An aminated rosin-based resin（ARBR） was synthesized as a novel environmentally-friendly adsorbent for removal of Norfloxacin（NOR） from aqueous solutions.Its features were characterized by scanning electron microscopy（SEM）,Fourier transform infrared spectroscopy（FTIR）,and surface area measurements（BET）.The effects of resin dosage,pH,and ionic strength on the ARBR adsorption properties of NOR were investigated by batch experiments.Results showed that the NOR adsorption amounts increased with pH in the range from 2.0 to 6.0,but decreased at higher pH（8-10）.The adsorption process of NOR followed a pseudo-second rate model and could be fitted to the Langmuir isotherm,with calculated maximum monolayer adsorption capacity of 30.29 mg·g^-1 at pH 6.0 and 20℃.Thermodynamic calculations showed that the adsorption of NOR was a spontaneous and endothermic process and could be attributed to a combination of electrostatic interactions and hydrogen bonding.Furthermore,the adsorbed NOR on ARBR could be efficiently desorbed by 0.1 mol·L^-1 HCl to regenerate the resin.After five adsorption-desorption recycles,ARBR had a stable adsorption performance and could be recycled.The adsorption performance is better than that of various commercial resins,and these research results contribute to the development of applications of rosin derivatives and their utilization in the environmental control of micro pollutants.