Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Rapid large-scale preparation of ZnO nanowires for photocatalytic application | Ma et al. Nanoscale Research Letters 2011 6 536 http content 6 1 536 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Rapid large-scale preparation of ZnO nanowires for photocatalytic application 1 1 -71 1 2 1 Chunyu Ma Zhihua Zhou T Hao Wei Zhi Yang Zhiming Wang and Yafei Zhang T Abstract ZnO nanowires are a promising nanomaterial for applications in the fields of photocatalysis nano-optoelectronics and reinforced composite materials. However the challenge of producing large-scale ZnO nanowires has stunted the development and practical utilization of ZnO nanowires. In this study a modified carbothermal reduction method for preparing large-scale ZnO nanowires in less than 5 min is reported. The preparation was performed in a quartz tube furnace at atmospheric pressure without using any catalysts. A mixed gas of air and N2 with a volume ratio of 45 1 was used as the reactive and carrier gas. About g ZnO nanowires was obtained using 1 g ZnO and 1 g graphite powder as source materials. The obtained nanowires exhibited a hexagonal wurtzite crystal structure with an average diameter of about 33 nm. Good photocatalytic activity of the nanowires toward the photodegradation of methylene blue dye under UV irradiation was also demonstrated. Introduction Organic dyes widely used in rubber textiles and plastics industries are one of the largest groups of pollutants released into wastewaters 1 . They have caused severe environmental contamination because of potential toxicity of the dyes and their visibility in water bodies. Degradation and removal of them are a vital matter for protecting the environment. However the traditional techniques for treating organic dyes are usually nondestructive ineffective and costly or just transfer pollutions from water to another phase 2 . Recently it has been reported that ZnO can be an alternative to conventional treatments for removing dye pollutants from water 3 . ZnO with a .
