共查询到20条相似文献，搜索用时 62 毫秒
1.
以介孔氧化钛为钛源,草酸为碳源,在N2气氛中500℃时进行固相热解,制备介孔碳-氧化钛（C/TiO2）纳米材料,采用溶胶-凝胶方法在C/TiO2上负载Pt纳米颗粒,制成了P/tC/TiO2纳米复合材料,并且在导电玻璃（ITO）上涂膜,制备C/TiO2和P/tC/TiO2电极;用X射线衍射对C/TiO2和P/tC/TiO2的结构进行表征,测定电极的光电化学性能。结果表明：C/TiO2和P/tC/TiO2呈现锐钛晶型,薄膜在0.1mo/lLNa2SO4溶液中具有典型的光电化学活性,P/tC/TiO2和C/TiO2比溶胶-凝胶法制备的TiO2薄膜具有更强的光激发和更稳定的光电流响应性能。 相似文献
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负载纳米TiO_2活性炭催化降解甲基橙的实验探究 总被引：1，自引：0，他引：1
文中以活性炭作为载体,用溶胶-凝胶法制备TiO2/活性炭催化剂,利用超声强化TiO2催化降解染料废水中甲基橙.实验结果表明：在实验范围内,二氧化钛在活性炭上的负载率40%～60%、TiO2/活性炭焙烧温度500℃、焙烧时间2.5h、催化剂加入量为0.75-1.0g/L时降解效果最好,随着甲基橙初始浓度增加,降解效率降低. 相似文献
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报道了一种以硅钨酸为电活性物质,用溶胶凝胶法制备的扑尔敏电极.该电极对扑尔敏响应的线性范围是1.0×10-1～4.0×10-5mol l,平均斜率为55mV dec,检测下限为2.5×10-5mol l,适宜的PH范围为5～8. 相似文献
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采用溶胶-凝胶法制备了膨胀石墨负载TiO2和负载氮掺杂TiO2（N-TiO2）光催化剂,用XRD和SEM对样品进行表征,并以甲基橙溶液为目标降解物进行光催化性能的评价。结果表明：纳米TiO2可牢固地负载在膨胀石墨表面和层间,当达到吸附平衡后,煅烧温度为500℃条件下制备的膨胀石墨负载N-TiO2光催化剂在加入量为10 g/L、反应时间60 min的条件下,对初始浓度为15 mg/L的甲基橙溶液的降解率达到95.2%。 相似文献
5.
竹炭负载二氧化钛吸附甲醛的研究 总被引：1，自引：0，他引：1
采用溶胶-凝胶法制备TiO2溶胶,采用浸渍-过滤法将TiO2负载于载体颗粒竹炭(BC)的表面,制成竹炭负载二氧化钛的复合物TiO2/BC,并对甲醛进行吸附实验。结果表明:BC和TiO2/BC对甲醛都具有较强的吸附,但是达到饱和吸附时,TiO2/BC的吸附量较大,单位时间内TiO2/BC的吸附甲醛的质量比BC多,且经过多次负载的TiO2/BC其对甲醛的吸附量增加,以负载3次为佳。 相似文献
6.
通过溶胶-凝胶法制备纳米TiO2,并将其负载在凹土上,制备出不同TiO2负载量的TiO2/凹土光催化剂,用XRD、SEM对光催化剂进行表征。用制备的光催化剂处理直接深蓝模拟印染废水,通过改变TiO2/凹土光催化剂投加量、pH值,考察TiO2/凹土光催化剂对直接深蓝模拟印染废水的脱色情况,同时考察了TiO2/凹土光催化剂的重复使用能力。结果表明:负载量25%,催化剂用量8 g/L,pH=3时处理效果最佳;重复使用7次,其脱色率仍高达91.30%。 相似文献
7.
采用溶胶-凝胶法制备TiO2溶胶,采用浸渍-过滤法将TiO2负载于载体颗粒竹炭(BC)的表面,制成竹炭负载二氧化钛的TiO2/BC复合材料,并对竹炭和TiO2/BC复合材料进行电镜扫描和甲醛吸附性能对比实验.结果表明:竹炭负载上TiO2后,TiO2在载体竹炭上的分布较均匀,主要集中在竹炭大孔和表面的凹陷处,没有将孔隙阻塞,所以TiO2的负载造成的竹炭比表面积减小的幅度并不很大;竹炭本身极性较弱,属于弱极性的材料,负载上强极性的TiO2后,极性增加;竹炭负载TiO2后,其对甲醛的吸附性能大大增加. 相似文献
8.
以钛酸丁酯和无水乙醇为反应物,采用溶胶-凝胶法制备CuO负载TiO2.以亚甲基蓝为模型反应物,实验结果表明,Cu/Ti元素质量比为30%,焙烧温度为500℃,产品光催化降解亚甲基蓝的反应性能最好.日光灯照射10 h后,亚甲基蓝的降解率可达58.4%.XRD表征结果显示,二氧化钛晶相为锐钛矿和金红石混晶结构,在Cu/TiO2中Cu以CuO晶体形式存在. 相似文献
9.
以钛酸正丁酯为先驱体,乙醇为溶剂,盐酸为催化剂,以溶胶凝胶法制备TiO2溶胶,并将其负载于经纯化处理的碳纳米管上,再经不同温度煅烧获得TiO2复合光催化剂。用红外光谱对TiO2煅烧及负载前后进行结构表征,考察了光照条件下溴酚蓝的降解率。采用溶胶-凝胶及负载方法获得CNT-TiO2光催化剂并且明显提高了TiO2光催化效果。加入光催化剂的溴酚蓝容易在20min时降解率达到89%,远高于未负载前的46%的降解率。经比较,400℃煅烧的CNT-TiO2光催化剂的光降解效果相对较好。 相似文献
10.
采用溶胶一凝胶法在玻璃基片上制备了TiO：多孔薄膜,主要研究了pH值、模板剂以及乙醇添加量对溶胶和多孔膜性能的影响．研究结果表明：溶胶一凝胶制备过程中,pH一3时和以聚乙二醇～1000为模板剂可得到稳定的溶胶,且n（PEO-1000）／n（Ti）为0．050时所得到的溶胶颗粒最小,团聚最轻,由其可制备出结构均一性好、无开裂的多孔膜;n（CH3CH2OH）／n（Ti）为24：1时,溶胶可在玻璃基体上形成完整的膜,烧结过程中随着聚乙二醇分解的CO2和H2O的逸出形成了许多微孔,得到完整的有序多孔TiO2薄膜。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
14.
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献
18.
正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
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《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
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《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献