排序方式: 共有26条查询结果,搜索用时 15 毫秒
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纳米SnO2@TiO2包覆催化剂的制备及表征 总被引:6,自引:0,他引:6
采用活性层包覆法在自制超细SnO 相似文献
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醋酸和丙三醇对制备SrTiO3的影响 总被引:5,自引:0,他引:5
醋酸和丙三醇对制备SrTiO_3的影响颜秀茹,霍明亮,王建萍,王菲,曾淑兰(天津大学化学系天津300072)关键词 冰醋酸,溶胶-凝胶过程,丙三醇,SrTiO_3SrTiO3是电子材料中使用最广的材料之一,有关它的制备已有不少报道。一般可以通过SrCO... 相似文献
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TiO2/SnO2复合光催化剂的制备及光催化降解敌敌畏 总被引:7,自引:0,他引:7
合成了直链醚-组氨酸Schiff碱(四甘醇醛缩双组氨酸Schiff碱)及其稀土配合物,以元素分析、红外光谱、热重、磁化率等确定配合物组成为Ln3(H2L)2(NO3)9(Ln=La,Nd,Gd,Er,Yb;L=C20H26N6O7),采用交叉极化结合魔角旋转技术(CP/MAS)和消除旋转边带技术(TOSS),获得固体高分辨^13C NMR谱,见到-COO^-的^13C谱峰分裂等新信息。结合液体^1H NMR谱等,对L-组氨酸中咪唑基的配位进行了研究,以EPR波谱探讨了配合物的晶体场强等特性。观察到Er配合物对超氧阴离自由基的清除有一定效果。 相似文献
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TiO_2/SnO_2复合光催化剂的制备及光催化降解敌敌畏 总被引:5,自引:0,他引:5
以 Sn Cl4· Ti( OBu) 4、氨水、乙醇为原料 ,采用活性层包覆法 ,制备出 Ti O2 / Sn O2 复合光催化剂 ,并用IR、XRD、TEM和 BET等手段对样品进行了表征 .研究其对有机磷农药敌敌畏的光催化降解效果 ,与单一半导体催化剂 Sn O2 、Ti O2 做了简单对比 .结果表明 :所制 Ti O2 / Sn O2 样品为包覆型结构 ,由锐钛矿型 Ti O2 金红石型 Sn O2 组成 ,与 Sn O2 及 Ti O2 晶体粉末相比所制 Ti O2 / Sn O2 包覆粒子光催化活性得到明显提高 . 相似文献
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镧系元素掺杂Mn-Zn铁氧体的制备和研究 总被引:6,自引:0,他引:6
本文以Fe2(SO4)3、ZnSO4·7H2O、MnSO4·H2O和Ln(NO3)3(Ln=La、Ce、Nd)为原料,通过水热合成法制备出了镧系元素(Ln=La、Ce、Nd)掺杂Mn-Zn铁氧体(Mn0.6Zn0.4LnxFe2-xO4)超细粉末,并利用XRD、TEM和VSM等手段对样品进行了表征,讨论了Ln掺杂量与掺杂种类对Mn-Zn铁氧体样品的影响。结果表明:要得到单相尖晶石型Mn0.6Zn0.4LnxFe2-xO4,Ln掺杂量(x)应小于0.1;适量Ln的掺杂可以大大改善Mn-Zn铁氧体的磁性能。 相似文献
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纳米Mn-Zn铁氧体的制备和研究 总被引:10,自引:0,他引:10
Nanosize manganese zinc ferrites were fabricated by hydrothermal precipitation route using Fe2(SO4)3, ZnSO4·7H2O, MnSO4·H2O as material, then some calcinated at 500 ℃ and studied by XRD, TEM, IR and VSM. The results showed that the products were spinel crystal structure and uniformly sized nanoparticles (15~25 nm) with little aggregation. The analysis of IR showed that the superficial water can be eliminated, but that was embedded in crystal lattice can not be removed by calcinating. The effect Zn content x on the lattice (a) of nanosize Mn1-xZnxFe2O4 was also discussed. The lattice of nanosize Mn1-xZnxFe2O4 decreases with x increasing; and its value deviated the standard lattice (a0) of normal size manganese zinc ferrites. A lot of water was absorbed during the hydrothermal process owing to the large surface of nanosize particles. The change of magnetic properties of MnxZn1-xFe2O4 with x increasing was studied: nanosize MnxZn1-xFe2O4 particles synthesized by us exhibited peculiar magnetic properties curve with Zn content (x) increasing, Superparamagnetic behaviors of the synthesized ZnFe2O4 samples were confirmed by magnetic characterization, which can be explained by the difference between the distribution of the metal ions (Mn2+, Zn2+ and Fe3+) among the tetrahedral (A) and the octahedral (B) sites of nanosize ferrite and that of bulk ferrite. 相似文献
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