铁改性腈纶纤维催化剂在偶氮染料降解反应中的应用

Application of Fe modified PAN fibrous catalyst to degradation of azo dyes

使用水合肼和盐酸羟胺对腈纶纤维进行表面改性,然后将其与铁离子反应制得铁改性腈纶纤维催化剂(PAN-Fe)。在过氧化氢存在条件下将PAN-Fe催化剂应用于2种水溶性阴离子偶氮染料的光催化氧化降解反应中,考察催化剂添加量、催化剂表面铁离子含量、染料浓度和pH值对染料降解反应的影响。结果表明:尽管PAN-Fe催化剂在暗态能催化染料降解反应,但是光辐射可促进其催化作用的提高;催化剂添加量及其表面铁离子含量的增加能够明显提高染料的脱色率;在PAN-Fe催化剂存在下染料降解反应可在碱性条件下进行,但是染料浓度的增加会使其脱色率降低。

Polyacrylonitrile （PAN） fiber was modified by hydrazine and hydroxylamine to enable ligation of ferric ions to the fiber surface so as to produce a Fe-modified PAN fibrous catalyst （PAN-Fe） for the oxidative degradation of two soluble anionic azo dyes in the presence of H2O2 . The dosage of catalysts, ferric ion content loading on catalyst, dye concentration and pH values on the photocatalytic decoloration of two azo dyes in water were investigated in this paper. The results indicated that PAN-Fe catalyst has a significant catalytic property on Oxidative degradation of two azo dyes, especially under light irradiation. Increasing the dosage of catalysts and enhancing ferric ion content lead to high decoloration level. Moreover, the decoloration of two azo dyes is developed in the presence of the catalysts under alkaline condition, but increasing concentration of dyes in solution causes the low decoloration percentage.