低温水解制备TiO2/ACF复合光催化剂及其对茜素红S的降解应用

以四氯化钛为原料,利用低温直接水解法制备了纳米二氧化钛,同时将其负载于活性碳纤维表面得到TiO2/ACF复合光催化剂.SEM照片显示二氧化钛在ACF上以纳米团簇的形式均匀附着;XRD结果表明所得TiO2/ACF中TiO2的晶型为金红石相,微晶尺寸为7.02 nm,350℃下煅烧后金红石相TiO2结晶更好,微晶尺寸为9.88 nm; XPS分析表明Ti元素以Ti4+的形式存在.将350 ℃煅烧得到的TiO2/ACF复合光催化剂应用于对茜素红S的光催化降解,实验表明其光催化性能良好.

Preparation of TiO2/ACF compound photocatalyst at low temperatures by hydrolyzation method and its photocatalytic degradation ability to alizarine red S

The TiO₂/ACF combined photocatalyst was obtained by synthesizing the nano-sized titania powders at low temperatures with the direct hydrolyzation method utilizing TiCl₄ as a raw material and loading it on ACF simultaneously.SEM photos showed that the particles of TiO₂ aggregated into clusters and were fixed on the surface of ACF.From the XRD results we can found that the crystalline patterns of immobilized TiO₂ were of rutile phase and their microcrystalline size was 7.02 nm.After calcination at 350℃,the crystallization of rutile phase was better than that before calcinations and the microcrystalline size was 9.88 nm.XPS results suggested that titanium really existed in the form of Ti⁴⁺.The TiO₂/ACF combined photocatalyst after calcination at 350℃photocatalytic degradation alizarin red S（ARS） indicated that the combined photocatalyst had good photocatalytic characteristics.