改性PAN纤维负载hemin催化剂的制备及应用

Preparation and Application of Modified PAN Fiber Loaded Hemin Catalyst

分别使用盐酸羟胺及其与水合肼的混合物对聚丙烯腈(PAN)纤维进行改性,得到偕胺肟改性PAN纤维(AO-PAN)和含有偕胺肟、氨基腙两种基团的混合改性PAN纤维(M-PAN)。然后分别将其与氯化血红素(hemin)进行反应制备了仿生催化剂hemin-AO-PAN、hemin-M-PAN,并应用于染料的氧化降解反应中,探讨了改性PAN纤维的增重率对hemin负载量及脱色率的影响,分析了纤维形态结构的变化及催化条件对催化剂降解染料的影响。结果表明,引入氨基腙基团会降低AO-PAN负载hemin的能力,但会明显改善其负载hemin后纤维的表面形貌和机械性能;hemin-AO-PAN、hemin-M-PAN都能够通过活化H2O2氧化降解罗丹明B染料,且相似条件下hemin-M-PAN比hemin-AO-PAN具有更高的催化活性,而且还具有较强的活化H2O2的能力以及较宽的p H适用范围。

In this paper, hydroxylamine hydrochloride and its mixture with hydrazine hydrate were used to modify polypropylene （PAN） fibers, it obtained amidoxime-modified PAN fibers （AO-PAN） and mixed modified PAN fibers （M-PAN） with amidoxime and amidrazone groups, respectively. Then these two obtained modified PAN fibers were employed as the supports for hemin to synthesize two biomimetic catalysts hemin-AO-PAN and hemin-M- PAN, and applied in the oxidative degradation of dyes. The effect of weight gain of AO-PAN and M-PAN on the catalyst loaded hemin, and decolorization rate were discussed, and analysised the change in fiber morphology and the effect of catalytic conditions on the degradation of dyes by the catalyst. The results show that compared with AO-PAN, the introduction of amidrazone group can reduce the capability of M-PAN to anchor hemin, which sig- nificantly improved the fibrous surface morphology and mechanieal properties. In addition, both hemin-AO-PAN and hemin-M-PAN can effectively degrade Rhodamine B through activate H2O2, under similar conditions, the hemin-M-PAN exhibited higher catalytic activity, stronger ability for H2O2 activation and better pH tolerance than the hemin-AO-PAN.