无机离子对Ag_3PO_4可见光降解亚甲基蓝的影响

Influences of inorganic ions on the photocatalytic degeneration of methylene blue with Ag_3PO_4

以亚甲基蓝(MB)为模拟废水污染物,Ag3PO4为光催化剂,固定污染物初始浓度、催化剂用量、光照强度和照射时间等,探讨不同浓度的无机阴、阳离子(NO-3、Cl-、SO2-4、Na+、Ca2+、Mg2+、Al 3+)对Ag3PO4光催化降解偶氮染料MB的影响.结果表明,Na+和NO-3对Ag3PO4光催化降解MB没有明显的影响;Cl-在一定程度上对MB的降解具有促进作用;SO2-4、Ca2+、Mg2+、Al3+在不同程度上抑制了该光催化反应的进行,且抑制顺序为SO2-4<Ca2+<Mg2+<Al 3+.

The effects of inorganic ions （NO -3 ,Cl - ,SO2 -4 ,Na ＋ ,Ca2 ＋ ,Mg2 ＋ ,Al3 ＋ ） with differ‐ent concentrations on the photodegradation of azo dye methylene blue （MB） on Ag3 PO4 were investigated ,under the fixed conditions including the initial concentration of MB ,the dosage of the catalyst ,the light intensity and irradiation time .Experimental results show that Na ＋ and NO -3 exhibit negligible effects on the degradation .Cl - promotes the degradation to some ex‐tent .SO2 -4 ,Ca2 ＋ ,Mg2 ＋ and Al3 ＋ have negative effect ,and the inhibition effect of these ions on the photocatalytic degradation of MB was in the order of SO 2 -4 〈Ca2 ＋〈 Mg2 ＋ 〈Al3 ＋ .