CAJ | 학술논문

以聚乙烯醇(PEG)为结构导向剂,利用水热法合成了形貌可控的Ta2O5纳米柱.采用X射线衍射、扫描电镜、透射电镜、漫反射紫外-可见光谱和光致发光光谱对所制备样品进行了表征.考察了结晶时间和Ta2O5/Sr(OH)2摩尔比等合成参数对样品形貌的影响,并在此基础上对Ta2O5纳米粒可能的生长机理进行了推测.结果表明,在PEG和Sr(OH)2存在条件下可以合成形貌可控的Ta2O5纳米柱.研究了紫外光下Ta2O5纳米柱降解罗丹明B的光催化性能,发现Ta2O5的形貌对光催化性能有很大影响, Ta2O5纳米柱的光催化性能与其长度和直径比成线性关系.催化降解反应的表观速率常数最高可达0.156 min–1,且经多次循环使用后,样品仍然保持较高的催化性能.
이취을희순(PEG)위결구도향제,이용수열법합성료형모가공적Ta2O5납미주.채용X사선연사、소묘전경、투사전경、만반사자외-가견광보화광치발광광보대소제비양품진행료표정.고찰료결정시간화Ta2O5/Sr(OH)2마이비등합성삼수대양품형모적영향,병재차기출상대Ta2O5납미립가능적생장궤리진행료추측.결과표명,재PEG화Sr(OH)2존재조건하가이합성형모가공적Ta2O5납미주.연구료자외광하Ta2O5납미주강해라단명B적광최화성능,발현Ta2O5적형모대광최화성능유흔대영향, Ta2O5납미주적광최화성능여기장도화직경비성선성관계.최화강해반응적표관속솔상수최고가체0.156 min–1,차경다차순배사용후,양품잉연보지교고적최화성능.
Tantalum pentoxide (Ta2O5) nanorods were hydrothermally synthesized using polyethylene glycol (PEG) as a guiding agent. The nanorods were characterized by X‐ray diffraction, scanning and transmission electron microscopies, and diffuse reflectance ultraviolet‐visible and photolumines‐cence spectroscopies. The effects of crystallization duration and Ta2O5/Sr(OH)2 ratio on the product morphology were investigated, and a growth mechanism was proposed. Phase‐pure Ta2O5 nano‐rods with controlled morphology were formed in the presence of PEG and Sr(OH)2, which was nec‐essary to form the nanorods. Sr(OH)2 induced the surface dissolution and re‐growth of Ta2O5. PEG induced the anisotropic growth of Ta2O5 by acting as a capping agent. The products were used to photocatalytically degrade rhodamine B under ultraviolet irradiation. The catalytic activity directly correlated with the length‐diameter ratio of the Ta2O5 nanorods. A maximum apparent reaction rate constant of 0.156 min–1 was obtained. The Ta2O5 nanorods were stable during photocatalytic reac‐tion and could be recycled several times without loss of activity.