水环境中阴离子对表面活性剂光催化降解的影响

EFFECTS OF ANIONS ON RATES OF PHOTOCATALYTIC DEGRADATION FOR SURFACTANT

研究了存在于水环境中的若干重要阴离子对表面活性剂十二烷基苯磺酸钠 (DBS)光催化降解速率的影响 .通过投加各种阴离子的钠盐进行实验 ,结果表明 :Cl- ,SO4 2 - ,NO- 3,HCO- 3有减低其光催化降解速率的作用 ;H2 PO- 4有加速作用 ;PO3- 4在低浓度时使光催化降解速率增加 ,而在高浓度时使其减缓 .在实验研究基础上 。

Experiments are carried out to study the effects of several anions on the photocatalytic degradation rates of sodium dodecyl\ benzene sulphonate (DBS).Na 2SO 4,NaNO 3,NaCl,NaHCO 3,NaH 2PO 4 and Na 3PO 4 are used to conduct the research. The results reveal that: (1) Cl -,SO 2- 4,NO - 3 and HCO - 3 all retard the rates of DBS degradation at different degrees; (2) H 2PO - 4 accelerates the rate of DBS degradation under the experimental conditions; (3) PO 3- 4 has positive effect at lower concentration and negative effect at higher concentration. Also the influence mechanism of anions on DBS degradation is studied.