酒石酸铁改性废旧棉织物Fenton反应催化剂的制备及其应用性能研究

Fabrication and Application Performance of Ferric-tartrate-modified Waste Cotton Fabric Serving as Fenton Catalyst

为了促进废旧棉织物的综合利用,使用酒石酸通过轧—烘—焙工艺对废旧棉织物进行改性反应以在其表面引入羧酸基,然后将改性后的废旧棉织物与Fe^(3+)反应制备酒石酸铁改性废旧棉织物,重点考察了酒石酸和NaH_2PO_4浓度以及焙烘温度对废旧棉织物表面羧酸基和Fe^(3+)含量的影响,并使用SEM和FTIR等对其进行表征。最后将酒石酸铁改性废旧棉织物作为非均相Fenton反应光催化剂对偶氮染料酸性红88进行氧化降解反应并评价其催化活性。结果表明,酒石酸与棉纤维表面羟基通过酯化反应而引入的羧酸基,能进一步与Fe^(3+)发生配位反应,由此可以制备酒石酸铁改性废旧棉织物。酒石酸和NaH_2PO_4浓度的增加以及焙烘温度的升高均能够显著增加酒石酸铁改性废旧棉织物表面Fe^(3+)含量。当酒石酸浓度为10%(质量分数)、NaH_2PO_4浓度为5%(质量分数)和焙烘温度为180℃时,废旧棉织物的改性效果最好。酒石酸铁改性废旧棉织物在光辐射条件下能够加速染料降解反应,其表面Fe^(3+)含量的增加能够提高其催化活性。此外,H_2O_2浓度为4.5mmol·L^(-1)、pH值为6及较高温度时染料降解效果最佳。棉纤维表面的染料对酒石酸铁改性废旧棉织物的光催化活性略有影响。

In order to enhance the integrated utilization of waste cotton fabric,tartaric acid was used to modify the waste cotton fabric through pad-dry-cure process for introducing surface hydroxyl groups,which coordinated with Fe 3+ions to produce the ferric tartrate-modified cotton fabric.Effect of concentrations of tartaric acid and NaH 2PO 4,as well as curing temperature on hydroxyl groups and Fe content on the surface of ferric tartrate-modified cotton fabric was studied.After characterization by SEM and FTIR,ferric tartrate-modified cotton fabric was evaluated as heterogeneous photo-Fenton catalysts for the oxidative degradation of Acid Red 88.The results indicated that carboxyl groups produced from esterfication between tartaric acid and cotton fiber coordinated with Fe 3+ions to prepare the ferric tartrate-modified cotton fabric.Increasing concentrations of tartaric acid and NaH 2PO 4 as well as elevation of curing temperature enhanced Fe content on the surface of ferric tartrate-modified cotton fabric.The best modification of cotton fabric was obtained at the condition of 10 wt%tartaric acid and 5 wt%NaH 2PO 4 as well as curing temperature of 180℃.The ferric tartrate-modified cotton fabric could accelerate the dye degradation under light irradiation.Higher Fe content could increase its catalytic activity.Besides,increasing H 2O 2 concentration favored the dye degradation.The highest degradation efficiency of the dye was obtained when 4.5 mmol·L-1 H 2O 2 was used at pH=6 with higher temperature.The colorants dyed on the ferric tartrate-mo-dified cotton fabric showed a slight effect on its catalytic performance.