铁负载纤维素/单宁吸附剂的制备及其对氟硅诺酮类抗生素的吸附性能  

Preparation of Adsorbent Fe-loaded Cellulose/Tannin and Its Adsorption Characteristics for Fluoroquinolones Antibiotics

作　　者：翁鑫 李琦琪 杨桂芳 吕源财[1] 刘以凡[1] 刘明华[1,2] WENG Xin;LI Qiqi;YANG Guifang;LV Yuancai;LIU Yifan;LIU Minghua(College of Environment and Safety Engineering,Fuzhou University,Fuzhou 350116,China;College of Environmental and Biological Engineering,Putian University,Putian 351100,China)

机构地区：[1]福州大学环境与安全工程学院,福州350116 [2]莆田学院环境与生物工程学院,莆田351100

出　　处：《材料研究学报》2024年第2期92-104,共13页Chinese Journal of Materials Research

基　　金：国家自然科学基金(22278082)。

摘　　要：采用纤维素/杨梅单宁复合气凝胶(CBT)为载体,用浸渍和原位还原法制备铁负载纤维素/单宁吸附剂(Fe-CBT),使用扫描电镜、傅里叶红外光谱和X射线能谱等手段对其表征,研究了三种典型氟喹诺酮类(FQs)抗生素诺氟沙星(NOR)、盐酸洛美沙星(LOM)和盐酸左氧氟沙星(LVX)的静态吸附性能。结果表明:共存阳离子Na^(+)、K^(+)、Mg^(2+)和Ca^(2+)都对吸附过程有明显的干扰。吸附过程是自发进行的放热反应,主要为单分子层吸附,而化学吸附是主要的限速步骤。准二级和Langmuir模型能很好地拟合这种吸附行为。这种吸附剂在298 K对NOR、LOM和LVX的最大理论吸附量分别达到99.07、74.17和40.14 mg/g。NaOH和NaCl对Fe-CBT都表现出较优的洗脱效果,用NaOH和NaCl溶液4次再生后Fe-CBT对NOR的吸附能力仍高于70%。Fe-CBT对FQs的去除,主要是静电引力、表面络合、氢键和π-π堆积间的协同作用造成的。The absorbent of Fe-loaded cellulose/bayberry tannin(Fe-CBT)was prepared via impregnation and in-situ reduction process,with cellulose/tannin composite aerogel(CBT)as the carrier,which then was characterized by means of scanning electron microscopy,Fourier infrared spectroscopy and Xray energy dispersive spectroscopy.Afterwards,the adsorption characteristic of the Fe-CBT was comparatively assessed for three typical fluoroquinolones(FQs)antibiotics,i.e.,norfloxacin(NOR),lomefloxacin hydrochloride(LOM)and levofloxacin hydrochloride(LVX).The results show that the coexistence of cations Na^(+),K^(+),Mg^(2+)and Ca^(2+)all interferes significantly with the adsorption process.Moreover,the adsorption process is an exothermic reaction that proceeds spontaneously,mainly as single-molecule layer adsorption,of which chemisorption is the main rate-limiting step.The quasi-secondary and Langmuir models are demonstrated to fit this adsorption behavior,and the maximum theoretical adsorption capacity of 99.07,74.17 and 40.14 mg/g can be achieved for NOR,LOM and LVX at 298 K,respectively.Both NaOH and NaCl show superior elution effect on Fe-CBT,namely,after re-generation for four times with NaOH and NaCl solutions,the adsorption capacity of Fe-CBT on NOR could even be maintained>70%.In addition,it is found that the removal of FQs by Fe-CBT is caused by the synergy between electrostatic gravitation,surface complexation,hydrogen bonding and π-π stacking.

关 键 词：有机高分子材料 铁负载 纤维素复合气凝胶 氟硅诺酮类抗生素 单宁 吸附 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]