材料导报
材料導報
재료도보
MATERIALS REVIEW
2015年
16期
1-7
,共7页
盐助甘氨酸自蔓延燃烧法%Ln2Zr2O7纳米晶体%甲基橙%光催化
鹽助甘氨痠自蔓延燃燒法%Ln2Zr2O7納米晶體%甲基橙%光催化
염조감안산자만연연소법%Ln2Zr2O7납미정체%갑기등%광최화
salt-assistant glycline combustion method%nanocrystal Ln2 Zr2 O7%helianthin B%photocatalysis
以硝酸锆和硝酸稀土为原料,甘氨酸水溶液和无机盐作为溶剂和分散剂,通过盐助甘氨酸自蔓延燃烧法(Salt-assistant glycine combustion method,SGCM)得到的前驱体在700℃以下热处理,合成了系列 Ln2 Zr2 O7纳米晶。探讨了最佳反应条件,研究了反应历程,讨论了惰性盐助剂在反应过程中的作用,比较了使用盐助剂与否对产物的分散性差别等。结果表明,在盐助甘氨酸自蔓延燃烧法合成中通过改变 n Gly/n NO 3-的比率,调节盐助剂量 n Salt/n M来对反应温度进行控制,得到的产物的结晶度高,团聚少,粒子更均匀,尺寸在20 nm 左右,晶体形貌完整,光催化活性强；Ln2 Zr2 O7的光催化主要源于稀土离子；稀土离子的光催化与4f 电子结构的相关性,和稀土离子磁矩与4f 电子结构的相关性是同源的。
以硝痠鋯和硝痠稀土為原料,甘氨痠水溶液和無機鹽作為溶劑和分散劑,通過鹽助甘氨痠自蔓延燃燒法(Salt-assistant glycine combustion method,SGCM)得到的前驅體在700℃以下熱處理,閤成瞭繫列 Ln2 Zr2 O7納米晶。探討瞭最佳反應條件,研究瞭反應歷程,討論瞭惰性鹽助劑在反應過程中的作用,比較瞭使用鹽助劑與否對產物的分散性差彆等。結果錶明,在鹽助甘氨痠自蔓延燃燒法閤成中通過改變 n Gly/n NO 3-的比率,調節鹽助劑量 n Salt/n M來對反應溫度進行控製,得到的產物的結晶度高,糰聚少,粒子更均勻,呎吋在20 nm 左右,晶體形貌完整,光催化活性彊；Ln2 Zr2 O7的光催化主要源于稀土離子；稀土離子的光催化與4f 電子結構的相關性,和稀土離子磁矩與4f 電子結構的相關性是同源的。
이초산고화초산희토위원료,감안산수용액화무궤염작위용제화분산제,통과염조감안산자만연연소법(Salt-assistant glycine combustion method,SGCM)득도적전구체재700℃이하열처리,합성료계렬 Ln2 Zr2 O7납미정。탐토료최가반응조건,연구료반응역정,토론료타성염조제재반응과정중적작용,비교료사용염조제여부대산물적분산성차별등。결과표명,재염조감안산자만연연소법합성중통과개변 n Gly/n NO 3-적비솔,조절염조제량 n Salt/n M래대반응온도진행공제,득도적산물적결정도고,단취소,입자경균균,척촌재20 nm 좌우,정체형모완정,광최화활성강；Ln2 Zr2 O7적광최화주요원우희토리자；희토리자적광최화여4f 전자결구적상관성,화희토리자자구여4f 전자결구적상관성시동원적。
Ln2 Zr2 O7 nanocrystal series were prepared according the following procedure:first,the precursors were synthesized thrugh salt-assistant gylcine combustion method (SGCM)using zirconium nitrate and rare earth ni-trates as raw materials while glycine aqueous solution and inorganic salt as solvent and dispersant,respectively,fol-lowed by thermal treatment of the responding precursors under 700 ℃.The reaction conditions were optimized and the reaction process was investigated.Furthermore,the role of inert salt assistant in the reaction was discussed while the dispersion difference of the products synthesized with and without salt assistant was compared.The results demon-strated that the products about 20 nm in size with high crystallinity,less agglomeration and improved particles homo-geneity as well as complete crystal morphology and enhanced photocatalytic activity could be obtained through altering the ratio of n Gly/n NO- and adjusting the dose of salt assistant to control the reaction temperature during salt-assistant glycine combustion synthesis procedure.The photocatalytic activity of Ln2 Zr2 O7 mainly came from rare earth ions while the photocatalytic activity of rare earth ions had a correlation to the structure of 4f electronic shell and the corre-lation was homogenous with that between magnetic torque and 4f electronic shell of rare earth ions.
