激光微织构泡沫铜的氧化铜纳米线制备及其光催化性能研究

Fabrication and photocalytic performance of CuO nanowires on copper foam based on laser texturing

本文采用激光织构与热氧化法相结合,以泡沫铜为基底制备具有微阵列结构的氧化铜纳米线(CuO NWs).采用扫描电子显微镜(SEM)、X射线能谱仪(EDS)和X射线衍射仪(XRD)对样品表面形貌及成分进行表征,讨论激光织构表面微结构对氧化铜纳米线生长的促进作用,设计不同的加工参数研究激光织构对氧化铜纳米线生长的影响,并通过光催化降解甲基橙溶液考察了CuO NWs的光催化性能.实验结果表明,经过激光织构的泡沫铜能增大纳米线的生长面积,提高样品表面氧元素的含量,有效地促进生长过程中氧化铜纳米线长度和密度的提高.不同的激光参数对纳米线的生长产生一定影响,具有良好的调控作用.CuO NWs光催化降解甲基橙的降解率可达97%,循环测试5次后的降解率仍可保持在96%,可见其稳定性良好,而且其片状结构更易回收,重复利用率高,具有优异的光催化性能.

Nanostructure CuO has attracted considerable research attention in the field of photocatalysis with excellent physical and chemical properties.However,most CuO photocatalytic nanomaterials prepared by chemical methods have problems such as low recycling rate and secondary pollution due to their morphological characteristics.In this paper,CuO nanowires(CuO NWs)grown based on copper foam were successfully prepared by laser texturing combined with subsequent thermal oxidation and used as photocatalyst for photocatalytic degradation of methyl orange(MO)solution.The effect of laser texturing parameters on the growth of copper oxide nanowires was investigated,such as scan spacing and scan times.After optimization,the appropriate laser processing parameters are chosen to form the micro-patterned grids on the copper foam.Subsequently,CuO NWs are synthesized by thermal oxidation.The structure morphology and chemical composition of samples were characterized by scanning electron microscopy(SEM),energy dispersive spectrometer(EDS)and X-ray diffraction(XRD).The photocatalytic performance of CuO nanowires based on copper foam was evaluated by degradation of methyl orange(MO)solution under ultraviolet light irradiation.The experimental results show that laser texturing of copper foam can not only increase the growth area of nanowires but also improve the content of thermally activated oxygen on the substrate.Therefore,the growth of CuO NWs is effectively promoted in terms of length and density.The photocatalytic degradation rate of MO solution by CuO NWs is up to 97% after 120 min.After five cycles’measurement,the degradation rate can still remain 96%.It demonstrates the good-performance stability and high recyclability of CuO NWs based on copper foam as photocatalysts.This study provides a feasible approach to synthesize CuO NWs on the copper foam and effectively extend the potential application of CuO nanomaterials in the industrial wastewater treatment.