Synergistic removal of aniline by carbon nanotubes and the enzymes of Delftia sp. XYJ6

Synergistic removal of aniline by carbon nanotubes and the enzymes of Delftia sp. XYJ6, a newly isolated bacterial strain for biodegrading aniline, was investigated. It showed that biodegradation rate of aniline was increased with the augment of protein concentration in cell-free extract of Delftia sp. XYJ6. The adsorption amount of aniline by multi-walled carbon nanotubes （MWCNTs） was slightly higher than that by single-walled carbon nanotubes （SWCNTs）, however the adsorption amount of protein of Delftia sp. XYJ6 by MWCNTs was lower than that by SWCNTs. Much more amount of aniline could be removed by CE of Delftia sp. XYJ6 in the presence of SWCNTs than MWCNTs, which indicated that an efficient reaction between aniline and enzymes of Delftia sp. XYJ6 on the surface of SWCNTs played a key role in the rapid enzymatic biodegradation of aniline. This study is not previously reported and may be useful in basic research and the removal of aniline from wastewater.

Interactions to plasm protein and application potentials of carbon nanotubes in blood-contacting medical devices

Carbon nanotubes(CNTs)have been largely investigated in various biomedical fields on the basis of their excellent physical properties and drug delivery performance.However,application capacities of CNTs in blood-contacting medical devices are given due attention though there have been increasingly accumulated experimental data showing promising potentials.Herein,we collected and showed research evidence that strong interactions of CNTs to plasm proteins are attractive and valuable features holding great application potentials for medical devices and implants used in blood-contacting environments,while blood compatibility has been a big challenge faced by this kind of devices.This review introduces the strong and nonspecific plasm protein adsorptions of CNTs due to their high purity of carbon composition and nanostructures,followed by discussions on the implication of these interactions to blood coagulation and complement activation,aiming to sort out and provide insights into the application potentials of CNTs in blood-contacting medical devices and implants in the context of anti-thrombosis and blood purification.

碳纳米管对苯胺的吸附行为

The adsorption of aniline on the as-grown and purified carbon nanotubes has been investigated. The initial concentration of aniline solution, time, temperature and pH values of aniline solution have great influence on the adsorption capacity. The adsorption capacity of the as-grown carbon nanotubes towards aniline was 4.8 mg/g at pH=5. For that treated with nitric acid, it increased to 15.4 mg/g. The adsorption capacity decreased with increase of temperature in the range of 283 to 303 K. The adsorption isotherms can be described by Freundlich equation.

苯胺在碳纳米管上的吸附特征

Purification processing has a great effect on carbon nanotubes.On one hand it can remove impurities and increase the surface area of carbon nanotubes.On the other hand it can introduce functional groups such as hydroxyl,carboxyl and carbonyl on the surface of carbon nanotubes.Both improved the adsorption capability of carbon nanotubes.The adsorption processes can be well modeled by isothermic equation Freundlich and equation de Boer-Ziwkker.The results also showed that carbon nanotubes can be regenerated and have great potential applications in environmental protection.

碳纳米管吸附去除水溶液中锌离子的性能

研究了碳纳米管对水溶液中锌离子的吸附去除性能。结果表明:纯化的碳纳米管对锌离子的去除效果明显高于未纯化的碳纳米管,在25 mL、50 mg/L的锌离子溶液中当其用量为0.1 g时,纯化的碳纳米管锌离子的吸附去除率达94.8%;吸附60 min达到平衡;在中性和弱碱性溶液中的去除率大于酸性溶液。

碳纳米管的制备和吸附特性研究

采用CVD法制备了碳纳米管,并用TEM、BET吸附和129Xe NMR对碳纳米管的表面和内部结构进行了表征。通过BET吸附和129Xe NMR的结果对比分析,可以推断碳纳米管并非全部是中空的,而是被许多隔膜分隔成多个锥帽形空腔,这些隔膜一般为无定形碳,五元环或七元环。经过纯化后的碳纳米管具有优异的吸附性能,有望作为新一代的储氢材料。

碳纳米管对污水中镉离子的去除作用

镉离子是水体、土壤中的一类重要污染物,主要来源于采矿、冶金、电镀等工业排放的废水,必须经严格处理后才能排放。为此,研究了碳纳米管对水中镉离子的吸附去除性能,首先将碳纳米管在浓硝酸中于140℃回流1h进行纯化;然后在一组100mL碘量瓶中,分别加入25mL50mg/L的镉离子溶液,再分别加入一定量的碳纳米管,进行静态吸附试验,测定镉离子的去除率。结果表明:纯化的碳纳米管对水中镉离子的去除效果明显高于未纯化的碳纳米管,在25mL50mg/L的镉离子溶液中当其用量为4g/L时,纯化的碳纳米管对水中镉离子的吸附去除率达到93.6%;纯化的碳纳米管对水中镉离子的吸附在60min达到平衡;溶液pH值对水中镉离子的去除有一定的影响,在中性和弱碱性条件下的去除率大于酸性。平衡吸附量qe与平衡质量浓度ρe之间的关系符合Freundlich和Langmuir等温吸附方程所描述的规律。

一种阳离子交换磁性多壁碳纳米管复合材料及其蛋白质的吸附性能研究

本研究首先制备了磁性氨基化多壁碳纳米管,然后通过静电自组装的方法将聚丙烯酸修饰在其表面,得到了一种新型阳离子交换磁性吸附剂。通过红外光谱、透射电镜、X射线光电子能谱对该吸附剂进行了表征。以溶菌酶和细胞色素c为模型蛋白,采用静态吸附法研究了该吸附剂对蛋白质的吸附性能,并测定了静态吸附等温线。结果表明:吸附剂对蛋白质的最佳吸附时间为1 h,缓冲液的最佳pH值为6.0。在此条件下,对溶菌酶和细胞色素c的最大吸附容量分别为237.5、204.5μg/mg,而对牛血清白蛋白几乎不产生吸附。因此,吸附剂对碱性蛋白质具有较高的吸附容量和选择性。最后,将吸附剂用于鸡蛋清中溶菌酶的分离纯化,获得了较高的纯度。