tailieunhanh - Báo cáo hóa học: " Synthesis and highly visible-induced photocatalytic activity of CNT-CdSe composite for methylene blue solution"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis and highly visible-induced photocatalytic activity of CNT-CdSe composite for methylene blue solution | Chen and Oh Nanoscale Research Letters 2011 6 398 http content 6 1 398 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Synthesis and highly visible-induced photocatalytic activity of CNT-CdSe composite for methylene blue solution Ming-Liang Chen and Won-Chun Oh Abstract Carbon nanotube-cadmium selenide CNT-CdSe composite was synthesized by a facile hydrothermal method derived from multi-walled carbon nanotubes as a stating material. The as-prepared products were characterized by X-ray diffraction scanning electron microscopy with energy dispersive X-ray analysis transmission electron microscopy TEM and UV-vis diffuse reflectance spectrophotometer. The as-synthesized CNT-CdSe composite efficiently catalyzed the photodegradation of methylene blue in aqueous solutions under visible-light irradiation exhibiting higher photocatalytic activity. Introduction Environmental problems such as toxic organic pollutants provide the impetus for fundamental and applied research into environmental areas. Semiconductor photocatalysts have attracted considerable attention for a long time in the fields of photochemistry 1-5 because of their usefulness with regard to solving environmental problems. Over the last few years considerable efforts have been made in the controlled synthesis of various nanoscaled materials to improve their properties for photocatalysis. Cadmium selenide CdSe is an n-type semiconductor. Its bandgap energy was reported to be in the range from to eV 6-9 . CdSe was found to be suitable for various optoelectronic applications such as light-emitting diodes laser diodes 10-13 catalysis 14 solar cells 15 and biological labeling 16 . More recently many groups have synthesized CdSe nanomaterials with high photocatalytic activity in the degradation of organic pollutants under UV light irradiation such as CdSe-Pt nanorods and nanonets 16 hybrid CdSe-Au nanodumbbells 17 CdSe ZnS-photo-sensitized nano-TiO2 film