超声场辅助制备碳纳米管/氧化钨纳米棒高效光催化剂的研究

来源期刊：有色金属科学与工程2012年第5期

论文作者：尹艳红 吴子平 羊建高

文章页码：39 - 44

关键词：碳纳米管；氧化钨；纳米棒；光催化性

Key words：carbon nanotubes; tungsten oxide; nanorods; photocatalystic activity

摘    要：采用超声场辅助制备了碳纳米管/氧化钨纳米棒.采用扫描电子显微镜（SEM）、能谱分析仪（EDS）、高分辨透射电镜（HRTEM）等手段对样品进行了表征，结果表明：在超声波的作用下，碳纳米管分散均匀，钨酸较为均匀地负载在碳纳米管表面上，经过800 ℃焙烧3 h，可以生成纳米级的碳纳米管/氧化钨棒.以日光灯（11 W）为光源，考察了催化剂和双氧水对亚甲基蓝降解率的影响.采用紫外可见分光光度计测定了反应液的吸光度，结果表明：在分别单独添加催化剂和双氧水的情况下，亚甲基蓝几乎无降解，当加入30 mg催化剂和2.5 mL双氧水时，当光照时间为70 min 时，脱色率达到95.3 %.通过5次回收后重复实验，发现该催化剂稳定性较好，可重复使用.

Abstract: The carbon nantubes/tungsten oxide nanorobs was prepared assisted by ultrasonic field. The samples were characterized by scanning electron microscopy（SEM）, transmission electron microscopy （TEM）and energy spectrum analyzer（EDS）. The results showed that the carbon nantubes disperse uniformly. The tungsten acid attaches to the surface of the carbon nantubes. The carbon nantubes/tungsten oxide nanorobs can be produced after 3 hours sintering at 800 ℃. The photocatalystic activities of the as-prepared photocatalyst for methylene blue were studied with 11W fluorescent light as the light source. The influences of the catalyst and the aqua hydrogen dioxide on the degradation rate of the methylene blue by were studied. The absorbance of the reaction liquid was determined by UV-Vis spectrophotometer. The results showed that the methylene blue didn’t degrade with catalyst or aqua hydrogen dioxide. The degradation rate reaches 95.3 % for 70 min of light with 30 mg of catalyst and 2.5 mL of aqua hydrogen dioxide. The catalyst can be duplicated for its stability is good after five times of degradation.