磁性卤氧化铋耦合过硫酸盐催化光降解AO7

Persulfate-assisted photocatalytic degradation of AO7 by magnetic bismuth oxyhalide compounds

采用溶剂热-沉积法制备了新型可见光催化磁性纳米Bi OI/Fe3O4复合材料,通过傅里叶红外光谱仪(FT-IR)、紫外-可见漫反射光谱(DRS)对其进行表征。首次提出了BiOI/Fe_3O_4耦合过硫酸盐(PS)催化光降解工艺,并以偶氮染料AO7模拟天然水体,考察了黄腐酸(FAs)以及水中常见的阴离子HCO_3^-和Cl^-等因素对AO7降解的影响。结果表明,持续可见光照射60 min,AO7在Bi OI/Fe_3O_4耦合PS体系中的降解率为98.3%;但加入HCO_3^-、黄腐酸(FAs)和Cl^-后,由于·OH和SO_4^-·被淬灭捕获,AO7的降解受到明显抑制,而Cl-的抑制作用小于前两者。经过3次材料重复回收利用,AO7降解率均能达到90%以上,表明材料具有良好的稳定性。

Composite material BiOI/Fe3O4 was successfully synthesized through a hydrothermal-precipitation method, and characterized by Fourier infrared spectroscopy （FF -IR） and UV -Vis diffuse reflec- tance spectroscopy （UVDRS）. It was the first time that photoeatalytie degradation process of BiOI/Fe304 coupled persulfate（PS） was proposed, and azo dye AO7 was used to simulate natural water. The effects of fulvic acid and common anions in water, C1- and HCO3 - were investigated. The results showed that the removal efficiency of BiOI/Fe3O＊ combined with PS reached 98.3% after 60 rain under visible light irradiation. However, with addition of HCO3 - , FAs and C1- , degradation of AO7 was significantly inhibited due to quenching of · OH and SO4- . However, the inhibiting effect of C1- was less than that of HCO3- and FAs. Finally, after 3 cycles, the composite photocatalyst still retained a high catalytic ability, i. e. , was able to remove 90% of AO7.