Cheng Zhi-Lin, Sun Wei
College of Chemistry and Chemical Engineering, Yangzhou University, 225002, China E-mail:
Water Sci Technol. 2015;72(10):1817-23. doi: 10.2166/wst.2015.403.
N-doped ZnO nanoparticles were successfully assembled into hollow halloysite nanotubes (HNTs) by using the impregnation method. The catalysts based on N-doped ZnO-loaded HNTs nanocomposites (N-doped ZnO/HNTs) were characterized by X-ray diffraction (XRD), transmission electron microscopy-energy dispersive X-ray (TEM-EDX), scanning electron microscopy-energy dispersive X-ray (SEM-EDX), UV-vis and Fourier transform infrared spectroscopy (FT-IR) techniques. The XRD pattern showed ZnO nanoparticles with hexagonal structure loaded on HNTs. The TEM-EDX analysis indicated ZnO particles with the crystal size of ca.10 nm scattered in hollow structure of HNTs, and furthermore the concentration of N atom in nanocomposites was up to 2.31%. The SEM-EDX verified most of N-ZnO nanoparticles existing in hollow nanotubes of HNTs. Besides containing an obvious ultraviolet absorbance band, the UV-vis spectra of the N-doped ZnO/HNTs catalysts showed an available visible absorbance band by comparing to HNTs and non-doped ZnO/HNTs. The photocatalytic activity of the N-doped ZnO/HNTs catalysts was evaluated by the degradation of methyl orange (MO) solution with the concentration of 20 mg/L under the simulated solar-light irradiation. The result showed that the N-doped ZnO/HNTs catalyst exhibited a desirable solar-light photocatalytic activity.
采用浸渍法成功地将氮掺杂的氧化锌纳米颗粒组装到中空埃洛石纳米管（HNTs）中。基于负载氮掺杂氧化锌的HNTs纳米复合材料（氮掺杂氧化锌/HNTs）的催化剂通过X射线衍射（XRD）、透射电子显微镜-能量色散X射线（TEM-EDX）、扫描电子显微镜-能量色散X射线（SEM-EDX）、紫外可见光谱和傅里叶变换红外光谱（FT-IR）技术进行了表征。XRD图谱显示在HNTs上负载有六方结构的氧化锌纳米颗粒。TEM-EDX分析表明，晶体尺寸约为10nm的氧化锌颗粒分散在HNTs的中空结构中，此外，纳米复合材料中氮原子的浓度高达2.31%。SEM-EDX证实了大多数氮掺杂氧化锌纳米颗粒存在于HNTs的中空纳米管中。除了含有明显的紫外吸收带外，与HNTs和未掺杂的氧化锌/HNTs相比，氮掺杂氧化锌/HNTs催化剂的紫外可见光谱还显示出一个可用的可见光吸收带。通过在模拟太阳光照射下对浓度为20mg/L的甲基橙（MO）溶液进行降解，评估了氮掺杂氧化锌/HNTs催化剂的光催化活性。结果表明，氮掺杂氧化锌/HNTs催化剂表现出理想的太阳光光催化活性。
