NiO-TiO_2纳米纤维的制备及对模拟印染废水的太阳光催化降解

Fabrication of NiO-TiO_2 Nanofibers and Its Photocatalytic Activity to Simulated Dyeing Effluents under Sunshine

采用溶胶—凝胶法和静电纺丝法以钛酸四正丁酯（Ti（OC4H9）4）、硫酸镍和聚乙烯吡咯烷酮（PVP）等为主要原料制备了PVP/NiO-TiO2纤维和直径为100～300纳米的NiO-TiO2纳米纤维.以差热—热重分析（DSC-TGA）、傅里叶红外光谱（FT-IR）和扫描电镜（SEM）等对NiO-TiO2纳米纤维进行了表征,测定了其对模拟印染废水亚甲基蓝溶液的太阳光催化性能.结果表明,太阳光照射下,当NiO的掺杂摩尔分数为0.05％,制备NiO-TiO2纳米纤维的焙烧温度为500℃时,NiO-TiO2纳米纤维对亚甲基蓝的催化活性最高,6h降解率达到98.2％,重复使用13次后亚甲基蓝的降解率仍然在93％以上.

The sol-gel method and electrospinning method are adopted to prepare PVP/NiO-TiO2 composite nanofibers and NiO-TiO2 nanofibers with the diameter of 100 ~ 300 nm by using Ti（OCaH9）4 ,NiSO4 and polyv- inglpyrrolidone （ PVP ） as starting materials. The nanofibers are characterized by DSC - TGA,FF - IR and SEM. The degradation of simulated dyeing effuents with methylene blue by using NiO-TiO2 nanofiber as cata- lyst is investigated. Results show that the NiO-TiOz nanofiber has the highest photocatalytic activity to methy- lene blue when the dopped ratio of NiO is 0.05 % and the calcined temperature is 500 ~C ;the degradation rate of methylene blue solution reached 98.2 % under sunshine for 6 h, and still remains above 93 % after thirteen times reuse.