采用TiO2光催化剂对河水中污染物进行光催化降解

用光催化剂TiO2对西清河废水进行了废水处理研究.实验结果表明,随着催化剂用量的增加,COD、色度的去除率逐渐增大, 但当其用量超过0.5g时,COD、色度的去除率增加缓慢,超过0.6g时开始下降;当pH<6.5时,随着pH值降低,当pH>6.5时,随着pH值升高,COD、色度去除率均降低;随着光照时间延长,COD、色度去除率逐渐升高,但当光照时间超过 10h 后, COD、色度去除率升高幅度非常缓慢.当催化剂用量为0.6g、 pH =6.5、光照12 h时,西清河废水的COD、色度去除率分别达到75.0%、78.5%.

Photocatalytic Degradat of Pollutant From River by TiO2 as Photocatalyst

In this article,waste water from Xiqing river was treated by TiO 2 as photocatalyst. The experimental results indicate :(1)the removal rate of COD and colority of waste water rose gradually along with quantity of catalyst,but increased slowly with the quantity over 0.5g ,and started to cut down with the quantity over 0.6g ;(2)the removal rate of COD and colority of waste water lowered as pH<6.5 in pace with pH cuting down,and pH>6.5,along with pH rising;(3) the removal rate of COD and colority of waste water rose gradually along with prolonging of illumination time,but increased much slowly with illumination time over 10h. The removal rate of COD and colority of waste water can reach 75.0% and 78.5% respectivesly with 0.6g photocatalyst, pH=6.5,illumination time 12h.