C@CdS/埃洛石纳米管复合光催化剂一步热解法的制备及光降解性能

通过一步热解法合成了一种新的复合光催化剂C@CdS/埃洛石纳米管(HNTs). 用扫描电镜(SEM)，X射线能谱(EDS)，透射电镜(TEM)，X 射线衍射(XRD)，紫外-可见漫反射光谱(UV-Vis DRS)，傅里叶变换红外(FT-IR)光谱，比表面积和拉曼光谱(RS)对材料进行表征. 利用可见光下降解四环素探究了C@CdS/HNTs 的光催化活性. 结果表明，所制备的不同热解温度的样品中，400 ℃热解温度下的样品降解四环素效果最好，可见光照射60 min 降解率能达到86%. 此外，得益于碳层、CdS和HNTs 的共同作用，光催化剂展示了很好的稳定性. 放置一年对催化活性没有任何影响，并且经过三次循环实验，光催化剂活性没有很大变化. 最后讨论了光催化剂的制备机理，并且对光催化降解过程的中间产物进行了分析.

Preparation of C@CdS/Halloysite Nanotube Composite Photocatalyst Using One-Step Pyrolytic Method and Its Photodegradation Properties

A novel photocatalyst, C@CdS/halloysite nanotubes (HNTs), was synthesized using a facile and effective pyrolytic method. The as-prepared photocatalyst was characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, specific surface area measurements, and X-ray energy dispersive, ultraviolet-visible diffuse reflectance, Fourier-transform infrared, specific surface area, and Raman spectroscopies. The photocatalytic activity of the sample was evaluated by the degradation of tetracycline (TC) under visible-light irradiation. The influence of different pyrolysis temperatures on the photocatalytic degradation of TC was investigated. The optimal pyrolysis temperature was found to be 400 ℃. The photodegradation rate reached 86% in 60 min under visible-light irradiation. In addition, benefiting from the common effects of carbon, CdS, and HNTs, the photocatalyst exhibited good chemical stability. After being laid aside for one year, the photocatalytic efficiency was unaffected and the photocatalyst retained its high catalytic activity after three catalytic cycles. Based on our experimental results, the preparation mechanism and degradation of the intermediate product of TC are discussed.