TiO_2-ACF对甲醛的吸附与降解性能研究

Adsorption and degradation properties of TiO_2-ACF for formaldehyde

采用纳米TiO_2对活性炭纤维(ACF)进行改性,制备出具有光催化作用的TiO_2-ACF材料,并对其结构和性能进行了表征;讨论了光照条件、初始甲醛浓度对TiO_2-ACF降解甲醛活性的影响,并研究了TiO_2-ACF的再生性能,结果表明:纳米TiO_2以颗粒的形式分散负载在ACF的表面,ACF负载TiO_2后,基本结构没有发生改变,但是自旋数增大了4个数量级,表面自由基含量大大提高;光照强度越大,初始甲醛浓度越低,TiO_2-ACF对甲醛的吸附及降解性能越好;TiO_2-ACF的重复性和再生性较好,重复使用4次后,105 min内对甲醛的降解率仍达80%。

Active carbon fiber（ACF） was modified with nano-TiO_2 to prepare TiO_2-ACF composite material with photocatalysis capability.The structure and properties of the composite material were characterized.The effects of the illumination condition and initial formaldehyde concentration on the degradation activity of TiO_2-ACF for formaldehyde were discussed.The regeneration property of TiO_2-ACF was studied.The results showed that nano-TiO_2 particles were dispersed and loaded on the surface of ACF; the basic structure of ACF loaded with TiO_2 did not change,but the number of spins increased by four orders of magnitude and the surface free radical content greatly increased;the higher the illumination and the lower the initial concentration of formaldehyde was,the better the adsorption and degradation property of TiO_2-ACF was for formaldehyde;TiO_2-ACF had fairly good repeatability and regeneration capability,which was able to provide the formaldehyde degradation rate of 80%within 105 min even after repeatedly using 4 times.