Preparation of regenerable granular carbon nanotubes by a simple heating-filtration method for efficient removal of typical pharmaceuticals
Preparation of regenerable granular carbon nanotubes by a simple heating-filtration method for efficient removal of typical pharmaceuticals
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通过简单的加热过滤方法制备可再生颗粒碳纳米管以有效去除典型药物
DOI：
10.1016/j.cej.2016.02.118
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发表时间：
2016-06
影响因子：
15.1
通讯作者：
Wiesner Mark R.
中科院分区：
文献类型：
--
作者：
Shan Danna;Deng Shubo;Zhao Tianning;Yu Gang;Winglee Judith;Wiesner Mark R.
采用一种简单方便的方法制备了新型颗粒状碳纳米管（CNTs），用于增强药物的吸附。将CNTs粉末在空气中450℃加热，然后过滤，得到的颗粒状吸附剂具有较高的比表面积和孔体积，因为加热过程在CNT表面产生了一些含氧官能团，使CNTs在颗粒饼的形成过程中更具分散性。多孔颗粒状碳纳米管不仅具有更多的吸附表面，而且比原始碳纳米管（p-CNTs）粉末更容易从溶液中分离。该吸附剂对卡马西平（CBZ）、四环素（TC）和双氯芬酸钠（DS）具有较快的吸附能力，根据Langmuir拟合，其在CNTs颗粒上的最大吸附量分别为：CBZ 369.5 μmol/g、TC 284.2 μmol/g和DS 203.1 μmol/g，比原始CNTs粉末分别提高了42.4%、37.8%和38.0%。此外，在空气中400°C条件下，经过5次再生循环，废颗粒碳纳米管的吸附能力均未降低。吸附的CBZ和DS被完全降解，而吸附的TC被部分氧化，残留有利于后续吸附。本研究开发了一种简单的方法来制备和再生颗粒碳纳米管吸附剂，以增强对水或废水中有机污染物的去除。
A simple and convenient method was used to prepare novel granular carbon nanotubes (CNTs) for enhanced adsorption of pharmaceuticals. By heating CNTs powder at 450 °C in air, followed by filtration, the obtained granular adsorbent exhibited high surface area and pore volume since the heating process produced some oxygen-containing functional groups on CNT surface, making CNTs more dispersible in the formation of granular cake. The porous granular CNTs not only had more available surfaces for adsorption but also were more easily separated from solution than pristine CNTs (p-CNTs) powder. This adsorbent exhibited relatively fast adsorption for carbamazepine (CBZ), tetracycline (TC) and diclofenac sodium (DS), and the maximum adsorption capacity on the granular CNTs was 369.5 μmol/g for CBZ, 284.2 μmol/g for TC and 203.1 μmol/g for DS according to the Langmuir fitting, increasing by 42.4%, 37.8% and 38.0% in comparison with the pristine CNTs powder. Moreover, the spent granular CNTs were successfully regenerated at 400 °C in air without decreasing the adsorption capacity in five regeneration cycles. The adsorbed CBZ and DS were completely degraded, while the adsorbed TC was partially oxidized and the residual was favorable for the subsequent adsorption. This research develops an easy method to prepare and regenerate granular CNT adsorbent for the enhanced removal of organic pollutants from water or wastewater.
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影响因子：
64.8
作者：
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通讯作者：
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