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首页> 外文期刊>Nanotechnology >Preparation of a MWCNT/ZnO nanocomposite and its photocatalytic activity for the removal of cyanide from water using a laser
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Preparation of a MWCNT/ZnO nanocomposite and its photocatalytic activity for the removal of cyanide from water using a laser

机译：MWCNT / ZnO纳米复合材料的制备及其光催化去除水中氰化物的活性

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Nano-zinc oxide (n-ZnO) was loaded onto multi-walled carbon nanotubes (MWCNTs) via a hydrothermal process. Here pure n-ZnO used for loading was synthesized by the pulsed-laser ablation technique while MWCNTs were used as received. The synthesized MWCNT/ZnO nanocomposites were characterized using x-ray diffraction, field emission scanning electron microscopy, high resolution transmission electron microscopy and Fourier transform infrared spectrometry. A model has been proposed for the structural nature of the alignment of ZnO on the surface of MWCNTs. The photocatalytic activity in the removal of highly toxic substances like cyanide (CN) was carried out in a special reactor using pulsed 355 nm UV generated by the third harmonic of an Nd:YAG laser. In order to understand the cyanide removal process, the study was carried out at different laser irradiation times, incident laser energies, pH of the solution and dosage of the MWCNT/ZnO nanocomposite. The study demonstrated that the CN removal process by MWCNT/ZnO composite has higher photocatalytic activity than pure n-ZnO and MWCNTs alone. The mechanism for the degradation using MWCNT/ZnO has been schematically explained. It was noticed that the oxidation process activity is affected by the pH of the solution, and after 20 min of UV laser irradiation, approximately 90% of CN had been degraded.
机译：通过水热工艺将纳米氧化锌（n-ZnO）加载到多壁碳纳米管（MWCNT）上。这里，通过脉冲激光烧蚀技术合成了用于装载的纯正n-ZnO，而直接使用了MWCNT。利用X射线衍射，场发射扫描电子显微镜，高分辨率透射电子显微镜和傅里叶变换红外光谱对合成的MWCNT / ZnO纳米复合材料进行了表征。已经提出了用于MWCNT表面上ZnO的取向的结构性质的模型。在特殊的反应器中，使用由Nd：YAG激光的三次谐波产生的脉冲355 nm紫外线，在去除高毒性物质（如氰化物（CN））中的光催化活性。为了了解氰化物的去除过程，在不同的激光照射时间，入射激光能量，溶液的pH值和MWCNT / ZnO纳米复合材料的剂量下进行了研究。研究表明，MWCNT / ZnO复合材料去除CN的过程具有比单独的纯n-ZnO和MWCNT更高的光催化活性。已经示意性地解释了使用MWCNT / ZnO进行降解的机理。注意到氧化过程的活性受溶液的pH值的影响，并且在UV激光照射20分钟后，大约90％的CN已被降解。

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