摘要
用共沉淀法、溶胶 凝胶法及室温固相反应法分别合成了镍镧复合氧化物。通过TG DTA、XRD和TEM技术对其热稳定性、结构及形貌等进行了分析。研究了不同制备方法、光照时间、催化剂用量和老化时间对其光催化降解活性染料性能的影响 ,并对氧化物间的有效协同作用机理进行了初步讨论。结果表明 ,对于难降解的活性翠蓝KGL( 2 0mg/L) ,3种方法制备的 1 5 0mg复合氧化物均可在 1 2 0min内将其光催化降解90 0 %以上 ,无光照时也可催化降解 79 6%以上 ;对于活性艳兰KNR、活性黑GR和活性艳红K2G这 3种染料 ,在 2 0min内 ,用共沉淀法和室温固相反应法所得 1 0 0mg复合氧化物可将其光催化降解 83 1 %以上 ,无光照时 ,也可将其催化降解 3 8 1 %以上 ;而溶胶 凝胶法所得复合氧化物仅能将其光催化降解 3 8 1 %以上 ,无光照时 ,无催化降解能力。老化 1个月时间可以提高催化剂的光催化效果。
The lanthanum-nickel mixed oxides were prepared by chemical coprecipitation, sol-gel method and solid state reaction method. Their thermal stability and microstructure were analyzed by TG-DTA, XRD and TEM. The effects of preparation method, illumination, aging time and dosage of photocatalyst on the efficiency of photo degradation of reactive dyes were investigated. The results revealed that 90.0% reactive turquoise KGL(20 mg/L) could be degraded with 150 mg mixed oxides prepared by three methods after illumination for 120 min, and it was above 79.6% without illumination; above 83.1% reactive brilliant blue KNR(reactive dark GR and reactive brilliant red K2G) could be degraded with 100 mg mixed oxides prepared by chemical coprecipitation and solid state reaction methods after illumination for 20 min, and it was above 38.1% without illumination; the degradation degrees of KNR, GR, K2G were above 38.1% with 100 mg mixed oxides prepared by sol-gel method after illumination. The dyes didn′t degradate by mixed oxides without illumination. The aged photocatalyst showed a higher photocatalytic activity.
出处
《应用化学》
CAS
CSCD
北大核心
2004年第2期144-149,共6页
Chinese Journal of Applied Chemistry
基金
河南省自然科学基金资助项目 ( 0 2 110 62 5 0 0 )
关键词
镍镧复合氧化物
制备
活性染料
光催化
La-Ni mixed oxide,preparation,reactive dye,photocatalytic property
