亚甲基蓝(MB)在天然水中是危险的,因为这种染料会导致严重的疾病,危害公众健康和生态系统。光催化降解是有效消除废水中染料污染物的重要技术,对生态和环境安全具有重要意义。在这里,合成了Cu2+取代的ZnFe2O4纳米材料(CuxZn1-xFe2O4;x=0,0.1,0.2,0.3,0.4,0.6),characterized,并应用于过氧化氢(H2O2)在可见光下光催化降解MB染料。通过XRD确定了光催化剂的特征,EDX,FTIR,DRS,BET,SEM,和TEM技术。Cu2+离子的掺入改变了晶相,颗粒大小,形态学,和表面积。对光催化条件进行了优化,主要考虑了以下几个因素,掺杂Cu2+离子的数量,H2O2浓度,吸附剂用量,和MB浓度。因此,Cu0.6Zn0.4Fe2O4催化剂在LED光(λ≥420nm)下90min内光催化降解MB的效率为99.83%,比纯ZnFe2O4高约4倍。光-Fenton动力学符合伪一级动力学模型(R2=0.981),给出的高速率常数为0.034min-1。它可以是,因此,结论是Cu2取代大大提高了CuxZn1-xFe2O4ZnFe2O4的光催化活性,表明Cu0.6Zn0.4Fe2O4作为光催化剂在染料废水处理中有广阔的前景。
Methylene blue (MB) is hazardous in natural water because this dye causes serious diseases that endangers public health and ecosystems. Photocatalytic degradation is a prominent technique for achieving the effective elimination of dye pollutants from wastewater and contribute vitally to ecology and environmental safety. Herein, Cu2+-substituted
ZnFe2O4 nanomaterials (CuxZn1-xFe2O4; x = 0, 0.1, 0.2, 0.3, 0.4, 0.6) were synthesized, characterized, and applied for the photocatalytic degradation of MB dye beneath visible light with the assistance of hydrogen peroxide (H2O2). The feature of the photo-catalysts was determined by XRD, EDX, FTIR, DRS, BET, SEM, and TEM techniques. Incorporation of Cu2+ ions changed the crystalline phase, particle size, morphology, and surface area. The photocatalysis condition was optimized with the following major factors, the amout of doping Cu2+ ions, H2O2 concentration, adsorbent dosage, and MB concentration. As a result, the photocatalytic MB degradation efficiency by Cu0.6Zn0.4Fe2O4 catalyst was 99.83% within 90 min under LED light (λ ≥ 420 nm), which was around 4 folds higher than that of pure
ZnFe2O4. The photo-Fenton kinetics were in accordance with the pseudo-first-order kinetic model (R2 = 0.981), giving the highes rate constant of 0.034 min-1. It can be, therefore, concluded that Cu2+ substitution considerably boosted the photocatalytic activity of CuxZn1-xFe2O4
ZnFe2O4, suggesting a bright prospect of Cu0.6Zn0.4Fe2O4 as a photo-catalyst in the dyes wastewater treatment.