摘要
针对水中四环素有机污染物去除,选择Cu(Ⅱ)表面修饰的成型分子筛Cu-13X(s)为吸附剂,系统研究了吸附行为,考察了吸附剂的再生使用性能.结果表明:Cu-13X(s)分子筛晶型、形貌及硅铝比与交换前基本一致.吸附动力学研究表明该过程符合准二级动力学模型;对于高浓度四环素水溶液,颗粒内扩散为吸附的速控步,但不是唯一的速控步.四环素在Cu-13X(s)分子筛上的吸附均符合Langmuir单分子层吸附模型,是自发且混乱度降低的放热过程.Cu-13X(s)再生4次后,去除率稳定,具有良好的再生使用性能.
To remove of organic pollutant tetracycline (TC) in water, Cu(Ⅱ) modified shaped zeolite (Cu-13X(s)) as an adsorbent was prepared and investigated to understand its adsorption behaviour for TC and regenerability. Results showed that the crystal topology, morphology and Si/Al ratio of Cu-13X(s) almost remained unchanged in comparison to 13X. The adsorption kinetics fitted pseudo-second-order model. For high concentrations of tetracycline, intra-particle diffusion was the rate-determining step, but not the only one. The adsorption isotherms were described well by the Langmuir model, and the process was exothermic and entropically unfavorable. After repeated adsorption-regeneration for 4 times, Cu-13X(s) still possessed constant removal efficiency, indicating excellent regenerability.
作者
范素兵
吕俊敏
马玉龙
杨小风
FAN Subing;LV Junmin;MA Yulong;YANG Xiaofeng(State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering,College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, 750021, China)
出处
《环境化学》
CAS
CSCD
北大核心
2018年第12期2721-2729,共9页
Environmental Chemistry
基金
国家自然科学基金(21467023)
宁夏高校科学研究项目(NGY2016005,NGY2017001)资助.
关键词
13X成型分子筛
四环素
吸附行为
再生
shaped 13X zeolite
tetracycline
adsorption behavior
regenerability
