摘要
为从有机废水中选择性吸附四环素(TC),在水系条件下采取简便快速的方法制备了金属有机骨架材料ZIF-67。采用多种手段对合成得到的ZIF-67进行了表征,研究了制备材料在TC与亚甲基蓝(MB)混合体系中的选择吸附性能,并考察了混合体系pH、污染底物配比、吸附体系中共存离子等因素对吸附过程的影响。结果表明,在温度为298 K,pH=6.5,MB和TC初始质量浓度分别为30、40 mg/L的条件下,ZIF-67对TC的吸附选择性能够达到93.5%。ZIF-67在混合体系中对TC的选择性吸附符合拟二级动力学模型和Langmuir模型,对TC的最大理论吸附量达735.3 mg/g。ZIF-67在有机废水中能够选择性吸附TC的主要机理推测为ZIF-67对阳离子染料MB具有静电排斥,而TC与ZIF-67则存在静电吸引及π-π相互作用,并且两者之间可能形成氢键,因此其对TC的吸附量远高于对MB的吸附量。与其他吸附剂相比,ZIF-67对TC具有更高的吸附量和较短的吸附平衡时间。
Metal organic frameworks ZIF-67 was prepared by a simple and rapid method in water system to selectively adsorb tetracycline(TC)from organic wastewater,and various methods were used to characterize synthesized ZIF-67. The adsorption selectivity of ZIF-67 in the mixed system of TC and methylene blue(MB)was studied,and the effects of pH,the ratio of contaminated substrate and coexisting ion in the mixed system on the adsorption process were investigated. The results showed that the adsorption selectivity of ZIF-67 for TC could reach 93.5% at298 K,pH=6.5,when the initial mass concentrations of MB and TC were 30 and 40 mg/L. The selective adsorption of TC by ZIF-67 in the mixed system conformed to the pseudo-second-order kinetic model and Langmuir model,and the maximum theoretical adsorption capacity of TC was 735.3 mg/g. The main mechanism of selective adsorption of TC in organic wastewater is deduced that the electropositive ZIF-67 had electrostatic repulsion to cationic dye MB,while TC had electrostatic interaction and π-π interaction with ZIF-67,and might form hydrogen bond with ZIF-67. Therefore,the adsorption amount of TC was much higher than that of MB. Compared with other adsorbents,ZIF-67 had higher adsorption capacity and shorter adsorption equilibrium time for TC.
作者
陈慕华
魏尚
李京润
武嘉奕
胡淇翔
陈浩鹏
付博
CHEN Muhua;WEI Shang;LI Jingrun;WU Jiayi;HU Qixiang;CHEN Haopeng;FU Bo(College of Chemical Engineering,Nanjing Forestry University,Nanjing 210037,China;Co-innovation Center for Efficient Processing and Utilization of Forest Products,Nanjing 210037,China;Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals,Nanjing 210037,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2022年第3期76-81,共6页
Industrial Water Treatment
基金
国家自然科学基金青年科学基金项目(21606133)
江苏省自然科学基金青年项目(BK20160922)。
