One-dimensional periodic mesoporous organosilica helical nanotubes with amphiphilic properties for the removal of contaminants from water
One-dimensional periodic mesoporous organosilica helical nanotubes with amphiphilic properties for the removal of contaminants from water
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DOI：
10.1039/c6ta00708b
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发表时间：
2016-03
影响因子：
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通讯作者：
Houbing Zou;Runwei Wang;Zhiqiang Shi;J. Dai;Zongtao Zhang;S. Qiu
中科院分区：
文献类型：
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作者：
Houbing Zou;Runwei Wang;Zhiqiang Shi;J. Dai;Zongtao Zhang;S. Qiu
在这项工作中，我们报告了一类新的一维高度均匀的周期性介孔有机硅（PMO）螺旋纳米管具有独特的两亲性框架和垂直的介孔通道的墙壁通过一个简单的，有效的和可控的一步策略。以手性介孔二氧化硅（CMS）纳米棒为硬模板。纳米管结构的演变涉及有机硅烷定向生长诱导蚀刻的过程，其中外部PMO壁的生长促进内部CMS纳米棒的溶解，并且溶解的硅酸盐物种通过与水解的有机硅烷低聚物共缩合转化为外部PMO壁。在结构演化过程中，螺旋形态得到了完整的保留。此外，通过这种方法可以容易地制备具有不同长径比、壁厚和曲率以及化学组成的PMO螺旋纳米管。此外，PMO螺旋纳米管表现出良好的两亲性，可以作为粒子乳化剂，在各种体系中制备不同形貌的Pickering乳液。最重要的是，PMO螺旋纳米管在去除水中疏水污染物方面表现出出色的性能，其吸附能力（1800-3000 mg g−1）远高于介孔二氧化硅纳米管和传统MCM-41，甚至与某些海绵相当。
In this work, we report one new class of one-dimensional highly uniform periodic mesoporous organosilica (PMO) helical nanotubes with a unique amphiphilic framework and perpendicular mesochannels in walls through a simple, efficient and controllable one-step strategy. The chiral mesoporous silica (CMS) nanorods were used as hard templates. The evolution of the nanotube structure involved a process of organosilane-directed growth-induced etching, in which the growth of the external PMO wall promoted the dissolution of internal CMS nanorods, and the dissolved silicate species transformed into the external PMO wall by co-condensation with hydrolyzed organosilane oligomers. Moreover, the helical morphology was retained completely in the process of structural evolution. In addition, PMO helical nanotubes with different aspect ratios, wall thicknesses and curvatures as well as chemical compositions could be easily prepared via this strategy. Furthermore, the PMO helical nanotubes exhibited good amphiphilicity and can be used as a particle emulsifier for fabricating Pickering emulsions with different morphologies in various systems. Most importantly, the PMO helical nanotubes showed outstanding performance in the removal of hydrophobic contaminants from water, whose sorption capacity (1800–3000 mg g−1) was much higher than those of mesosilica nanotubes and conventional MCM-41, and even comparable to those of some sponges.