引用本文:
范素兵, 吕俊敏, 马玉龙, 杨小风. Cu修饰成型13X分子筛对水中四环素的吸附行为[J]. 环境化学, 2018, 37(12): 2721-2729
FAN Subing, LV Junmin, MA Yulong, YANG Xiaofeng. Adsorption behavior of modified shaped 13X zeolite for removing tetracycline in aqueous solution[J]. Environmental Chemistry, 2018, 37(12): 2721-2729

Cu修饰成型13X分子筛对水中四环素的吸附行为
范素兵, 吕俊敏, 马玉龙, 杨小风
宁夏大学省部共建煤炭高效利用与绿色化工国家重点实验室, 宁夏大学化学化工学院, 银川, 750021
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.
关键词:    13X成型分子筛    四环素    吸附行为    再生   
Adsorption behavior of modified shaped 13X zeolite for removing tetracycline in aqueous solution
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
Abstract:
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.
Key words:    shaped 13X zeolite    tetracycline    adsorption behavior    regenerability   
收稿日期: 2018-08-23
基金项目: 国家自然科学基金(21467023)和宁夏高校科学研究项目(NGY2016005,NGY2017001)资助.
马玉龙,Tel:15209607945,E-mail:nxylma@163.com
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