Intercalation of rigid molecules between carbon nanotubes for adsorption enhancement of typical pharmaceuticals
Intercalation of rigid molecules between carbon nanotubes for adsorption enhancement of typical pharmaceuticals
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DOI：
10.1016/j.cej.2017.09.054
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发表时间：
2018-01
影响因子：
15.1
通讯作者：
Danna Shan;S. Deng;Conghui He;Jin Li;Hubian Wang;Chengxu Jiang;Gang Yu;M. Wiesner
中科院分区：
文献类型：
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作者：
Danna Shan;S. Deng;Conghui He;Jin Li;Hubian Wang;Chengxu Jiang;Gang Yu;M. Wiesner
为了避免多孔碳纳米管在溶液中聚集，提出了亲核芳香取代反应来合成多孔碳纳米管。将羟基化碳纳米管（CNTs-OH）与不同浓度的刚性癸基联苯（DFB）反应，制备了不同的碳纳米管基吸附剂（CNT-DFB 0.9、CNT-DFB 1.8、CNT-DFB 2.7和CNT-DFB 3.6）。其中CNT-DFB 1.8对卡马西平（CBZ）和四环素（TC）的吸附能力最强，这是由于其比表面积和孔体积均高于粉末状CNTs。验证了所提出的反应，并表征了CNT-DFB吸附剂的织构性质。CNT-DFB 1.8吸附剂对CBZ的吸附速度快于TC，最大吸附量分别为403.0和456.5 μmol/g。随着溶液pH的升高，CNT-DFB 1.8对TC的吸附量降低，而CBZ对TC的吸附量增加。此外，采用简单的热法在400 °C空气中加热再生废CNT-DFB 1.8，在5个吸附循环中吸附容量变化不大。该研究为提高碳纳米管在吸附剂中的分散性提供了一种新的方法，显示出在水或废水处理中去除药物的潜在应用。
A nucleophilic aromatic substitution reaction was proposed to synthesize porous carbon nanotubes (CNTs) to avoid their aggregation in solution. Hydroxylated carbon nanotubes (CNTs-OH) were reacted with different concentrations of rigid decafluorobiphenyl (DFB) to form the different CNTs-based adsorbents (CNT-DFB0.9, CNT-DFB1.8, CNT-DFB2.7 and CNT-DFB3.6). Among them, CNT-DFB1.8 exhibited the highest adsorption capacity for carbamazepine (CBZ) and tetracycline (TC) due to its higher specific surface area and pore volume than powdered CNTs. The proposed reaction was verified and the textural properties of the CNT-DFB adsorbent were characterized. The CNT-DFB1.8 adsorbent exhibited faster adsorption for CBZ than TC, and the maximum adsorption capacities for CBZ and TC were 403.0 and 456.5 μmol/g respectively, according to the Langmuir fitting. With the increase of solution pH, TC adsorption on CNT-DFB1.8 decreased while CBZ adsorption increased. In addition, a simple thermal method was applied to regenerate the spent CNT-DFB1.8 by heating in air at 400 °C, and the adsorption capacity changed little in the five adsorption cycles. This study provided a novel method to increase the dispersion of CNTs in the prepared adsorbent, showing the potential application for the removal of pharmaceuticals in water or wastewater treatment.