华南师范大学学报(自然科学版)
華南師範大學學報(自然科學版)
화남사범대학학보(자연과학판)
JOURNAL OF SOUTH CHINA NORMAL UNIVERSITY (NATURAL SCIENCE EDITION)
2014年
5期
54-58
,共5页
棒状ZnO%管状ZnO合成%光致荧光%光催化降解
棒狀ZnO%管狀ZnO閤成%光緻熒光%光催化降解
봉상ZnO%관상ZnO합성%광치형광%광최화강해
rod ZnO%synthesis of tubular ZnO%photoluminescence%photocatalytic degradation
采用一种新颖、简单、环保的方法,在高浓度NaOH溶液中,n(Zn)∶n(NaOH)=1∶30,于92℃下对已合成的棒状ZnO原料进行碱溶反应,获得了管状结构的ZnO.探讨其形成机理,发现材料的不同晶面性质不同,在碱中的溶解情况不同,导致管状结构形成,该法适用于具有类似性质的管状材料的合成.形成管状ZnO后材料的长径比缩小,均匀性增加,荧光发射增强,同时在可见区(400~800 nm)出现一定程度的吸收,这些现象说明形成管状结构后ZnO的比表面增加,表面性质发生一定程度的变化,表面及内部的缺陷性质和数目都有所改变.该管状ZnO材料用于光催化降解亚甲基蓝(MB),其降解效率明显增强,经1 h光照,MB的降解率由83.1%(棒状ZnO)增加到93.9%(管状ZnO).
採用一種新穎、簡單、環保的方法,在高濃度NaOH溶液中,n(Zn)∶n(NaOH)=1∶30,于92℃下對已閤成的棒狀ZnO原料進行堿溶反應,穫得瞭管狀結構的ZnO.探討其形成機理,髮現材料的不同晶麵性質不同,在堿中的溶解情況不同,導緻管狀結構形成,該法適用于具有類似性質的管狀材料的閤成.形成管狀ZnO後材料的長徑比縮小,均勻性增加,熒光髮射增彊,同時在可見區(400~800 nm)齣現一定程度的吸收,這些現象說明形成管狀結構後ZnO的比錶麵增加,錶麵性質髮生一定程度的變化,錶麵及內部的缺陷性質和數目都有所改變.該管狀ZnO材料用于光催化降解亞甲基藍(MB),其降解效率明顯增彊,經1 h光照,MB的降解率由83.1%(棒狀ZnO)增加到93.9%(管狀ZnO).
채용일충신영、간단、배보적방법,재고농도NaOH용액중,n(Zn)∶n(NaOH)=1∶30,우92℃하대이합성적봉상ZnO원료진행감용반응,획득료관상결구적ZnO.탐토기형성궤리,발현재료적불동정면성질불동,재감중적용해정황불동,도치관상결구형성,해법괄용우구유유사성질적관상재료적합성.형성관상ZnO후재료적장경비축소,균균성증가,형광발사증강,동시재가견구(400~800 nm)출현일정정도적흡수,저사현상설명형성관상결구후ZnO적비표면증가,표면성질발생일정정도적변화,표면급내부적결함성질화수목도유소개변.해관상ZnO재료용우광최화강해아갑기람(MB),기강해효솔명현증강,경1 h광조,MB적강해솔유83.1%(봉상ZnO)증가도93.9%(관상ZnO).
Using a novel , simple and environmental method , the tubular ZnO was synthesized by the reaction of rod ZnO raw material with sodium hydroxide ( NaOH ) solution at 92 ℃ for 3 h.The formation mechanism of tubular ZnO was discussed and the result showed that the differences of surface atomic structures result in a distinct chemi -cal ability to react with NaOH to form tubular structure .The tubular ZnO exhibits a lower length to diameter ratio , higher homogenization , and stronger fluorescence emission than ZnO raw material .Specially , the tubular ZnO ex-hibits an absorption in the region of 400-800 nm.The tubular ZnO possesses increased surface area , variational surface character , and incremental defects on the surface and in the interior .The photodegradation rate of methyl-ene blue ( MB) was 93.9%in tubular ZnO system , higher than 83.1%in rod ZnO system under 1 h irradiation.