磷掺杂TiO_2/改性滑石粉光催化涂层降解亚甲基蓝的研究  

Study on degradation of methylene blue catalyzed by P-doped TiO_2/modified talcum photocatalytic coating

作　　者：刘文磊 

机构地区：[1]中国石油工程建设公司华东设计分公司,山东青岛266071

出　　处：《电镀与涂饰》2016年第2期111-115,共5页Electroplating & Finishing

摘　　要：以硝酸改性天然滑石粉作载体,非金属元素P(来自磷酸)掺杂二氧化钛(P-TiO_2)为活性组分,采用溶胶-凝胶法获得了可对阳光响应的具备吸附-降解集成处理效果的光催化剂P-TiO_2/改性滑石粉。在相同条件下将未改性滑石粉、改性滑石粉、纯TiO_2、P-TiO_2和P-TiO_2/改性滑石粉分别与丙烯酸清漆通过研磨和超声分散制备了可用于降解水中亚甲基蓝的可见光催化涂层。用X射线衍射仪、能谱仪、扫描电镜表征了催化剂,并比较了它们制备的涂层对亚甲基蓝的光催化降解作用和吸附作用。结果显示,P-TiO_2涂层性能好于纯TiO_2涂层,吸附率和降解脱色率分别提高了4.0和25.0个百分点。改性滑石粉涂层的吸附率比未改性滑石粉涂层高17.8个百分点,但二者均没有降解脱色效果。P-TiO_2/改性滑石粉涂层的光催化性能最优,其降解脱色率是P-TiO_2涂层的1.3倍,吸附率也高出38.0个百分点。A P-TiO2/modified talcum photocatalyst, which could be active under sunlight and have combined adsorption-degradation function, was prepared via sol-gel method by using nitric acid-modified natural talcum powder as supporter and phosphorus （a nonmetallic element from phosphoric acid） doped titanium dioxide （P-TiO2） as functional component. The visible-light photocatalytic coatings used for degradation of methylene blue in water were made by mixing unmodified talcum, modified talcum, pure TiO2, P-TiO2 and P-TiOz/modified talcum respectively with acrylic varnish through ultrasonic dispersion and grinding under the same conditions. These catalysts were characterized by X-ray diffraction, energy- dispersive spectroscopy and scanning electron microscopy. The photocatalytic degradation and adsorption of methylene blue by the coatings made with these catalysts were compared. The results indicated that the coating made with P-TiO2 has better performance than pure TiO2. The former＇s adsorption rate and degradation/decolorization rate are increased by 4.0 and 25.0 percentage points respectively as compared with the latter＇s. Both of the coatings made with modified and unmodified talcum have no degradation/decolorization effect, and the former＇s adsorption rate is 17.8 percentage points higher than the latter. The coating made with P-TiOz/modified talcum has the best photocatalytic performance with a 30% increase in degradation/ decolorization rate and 38.0 percentage points higher in adsorption rate as compared with the coating made with only P-TiO2.

关 键 词：二氧化钛 掺杂 滑石 改性 丙烯酸清漆 光催化涂层 亚甲基蓝 降解 

分 类 号：TQ630.7[化学工程—精细化工]