Study On The Synthesis Of CNTs-SnWO₄ Photocatalysts And Its Photocatalytic Activity Under Visible Light Irradiation

Photocatalytic technology is one of the most promising technology in green and renewable energy project, has a very prominent advantages:Its energy is derived from the rich solar in nature;Photocatalytic reaction is mild and can happened at room temperature;Photocatalytic reaction product in the process is non-toxic or recycled, won’t produce secondary pollution;Solid catalyst is easier to collect, circulation and reuse, low prices, has the popularity.This thesis mainly covers the following aspects:(1) The visible-light photocatalyst CNTs-SnWO4 has been successfully synthesized by CNTs, SnCl2·2H2O and Na2WO4·2H2O through hydrothermal process. The prepared photocatalysts were characterized by XRD, SEM, UV-vis DRS and BET surface area analysis.Through the degradation of methyl orange,the results showed that CNTs-SnWO4 prepared under the condition of pH=1.7,heated at 100 ℃ for 2 h possessed the best photocatalytic activity.(2) Photocatalytic degradations of Methyl Orange were performed to investigate the influence of different conditions. The results showed that:The optimum composite dosage was 2.0 g/L when the initial strength of Methyl Orange aqueous was 40 mg/L.Under the condition of acidic,the degradation rate of methyl orange was fastest. NaCl lowered the degradation of methyl orange.(3) Choosing rhodamine b and p-nitrophenol as test substrates further demonstrated the photocatalytic activity of CNTs-SnWO4.Similar with the results of methyl orange,the decolourization ratio of rhodamine b rose fell as the initial strength increased. NaCl lowered the degradation of rhodamine b.