高浓度盐对光催化降解有机废水的影响

[目的]研究高浓度盐对光催化降解有机废水的影响。[方法]以罗丹明B为降解对象,采用电化学阳极氧化法制备Fe掺杂TiO2纳米管阵列,以此为光催化剂降解罗丹明B模拟废水,并分别考察了NaCl、Na2SO4、KCl和K2SO4这4种常见的盐在较高浓度下对光催化降解有机废水的影响,确定盐促进或抑制光催化降解有机废水的极限浓度。[结果]根据不掺盐10 mg/L罗丹明B溶液的光催化效率与时间关系图可知,该溶液在180 min时的降解率接近于100%。在试验涉及的浓度范围内,同一种盐均有对废水降解速率最大的最适浓度,就浓度为8%的4种盐而言,这4种盐均对光催化降解有机废水起到了促进作用,但促进程度不一,以8%的Na2SO4的促进作用最为明显。[结论]4种高浓度的盐均对光催化降解有机废水起到了促进作用。

Effects of High Concentration Salts on Photocatalytic Degradation of Organic Wastewater

[Objective] The study aimed to research the effects of high concentration salts on the photocatalytic degradation of the organic wastewater.[Method] With the rhodamine B as the degradation object,the Fe-doped TiO2 nanotube arrays were prepared by using the electrochemical anodic oxidation method and it was taken as the photocatalytic agent to degrade the rhodamine B so as to simulate the waste water.The effects of 4 kinds of common salt including NaCl,Na2SO4,KCl and K2SO4 with higher concn.on degrading the organic wastewater by the light catalytic degradation were examined resp.and the limit concentration of the salts that could improve or suppress the photocatalytic degradation of the organic wastewater was confirmed.[Result] According to relationship chart of the photocatalytic efficiency and time for the 10 mg/L rhodamine B solution without adding the salt,it was found that the solution had the degradation rates close to 100% at 180 min.In the the concentration range involved by the experiment,the same kind of salt all had the biggest optimal concentration for the degradation rate of the waste water.As for 4 kinds of the salt with the concn.of 8%,the 4 kinds of the salts could play a improvement action on the photocatalytic degradation of the organic wastewater,their improving degree was different,in which the improvement action of 8% Na2SO4 was most obvious.[Conclusion] 4 kinds of the high concentration salts all play an improvement action on the photocatalytic degradation of the organic wastewater.