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通过矿化接枝技术将溶胶-凝胶法制备的纳米TiO2负载在聚苯乙烯微珠裁体上,制成负载型纳米TiO2光催化剂.利用导电聚苯胺对负载型纳米TiO2光催化剂进行可见光改性,通过XRD、SEM等方法对改性纳米TiO2先催化剂进行表征,并用改性催化剂在太阳光照射下对3种工业含氰废水进行降解处理.结果表明,导电聚苯胺对负载型纳米TiO2光催化剂的涂膜改性,显著改善了负载型纳米TiO2光催化剂在可见光条件下的光催化性能,可有效降解废水中的大部分有毒氰根(CN-),使其含量远低于国家排放标准. 相似文献
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以多孔泡沫镍为载体,采用水热合成法制备了Sr改性和Sr、F共掺杂改性多孔光催化材料,采用XRD、TEM、SEM、FT-IR、UV-vis、XPS对样品进行了表征,并以样品对水中罗丹明B的降解性能为评价指标,对样品的光催化性能进行了评价.样品对水中罗丹明B的光催化降解反应为零级反应.Sr改性样品中生成SrTiO3晶体,TiO2以非晶态存在,光催化性能提高,最佳掺杂量为1.25%.煅烧处理后样品的光催化性能提高,最佳掺杂量为0.25%.0.25%Sr、2.0%F共掺杂改性样品中催化剂主体为锐钛矿型纳米TiO2,其光催化性能优于单一Sr改性样品,500℃煅烧处理使其光催化性能略有提高. 相似文献
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本文采用无机和有机两种改性方法对钠基膨润土进行改性,在超声辅助下采用溶胶-凝胶法制备了TiO2/改性膨润土复合光催化材料。用X射线衍射(XRD)和红外光谱(IR)等测试技术对复合材料进行了表征,以TNT的吸附和降解为模型反应,考察了膨润土的改性对复合材料的吸附和光催化性能的影响。实验结果表明:无机改性的膨润土层间距减小,而有机改性膨润土的层间距增大;膨润土的改性提高了其对水中有机物的吸附性能,且能有效地抑制复合材料中TiO2晶粒尺寸,提高复合材料的光催化性能。 相似文献
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采用晶胶模板法制备了有序多孔TiO2材料,在微波辐照条件下对其掺硫改性,利用SEM、XRD、XPS分析等方法对掺硫TiO2材料进行表征,并研究掺硫前后TiO2材料光催化性能。实验结果显示,通过晶胶模板法制备的有序多孔TiO2材料整体比较致密,但局部有孔洞的塌陷。微波辐照前后有序多孔TiO2材料的晶型没有改变,仍为锐钛型。XPS分析发现微波辐照制备掺硫有序多孔TiO2材料是可行的,且有序多孔TiO2材料中含有硫元素约为1.44%。掺硫有序多孔TiO2材料的光催化性能好于未掺硫TiO2光催化性能。 相似文献
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金红石型纳米TiO2改性ABS工程塑料抗老化应用研究 总被引:1,自引:0,他引:1
GUO Gang CAO Jianjun DUAN Xiaoping HUANG Wanxia TU Mingjing 《材料导报》2004,18(Z3):88-90
采用TEM和UV-Vis表征了金红石型纳米TiO2的性能特征;利用金红石型纳米TiO2优异的紫外线屏蔽性能,通过熔融共混法制备了金红石型纳米TiO2改性ABS复合材料,采用氙灯气候试验机和荧光紫外灯曝露箱对改性ABS材料进行了人工加速老化,并对采用氙灯老化前后的测试样条进行了悬臂梁冲击强度测试,对采用荧光紫外灯老化前后的光泽度变化进行了测试,结果表明,纳米TiO2对ABS材料有一定的增韌作用,并能赋予改性ABS材料优异的抗老化性能,延长ABS制品的使用寿命.实验最后借助SEM对纳米TiO2在ABS中的分散性进行了研究. 相似文献
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L. K. Neudachina A. Ya. Golub Yu. G. Yatluk V. A. Osipova Yu. A. Berdyugin E. M. Gorbunova L. V. Adamova O. V. Koryakova M. V. Kuznetsov 《Inorganic Materials》2011,47(4):435-441
Organic-inorganic hybrid sorbents based on a polysiloxane modified with amino and thiourea groups have been synthesized for
the first time by a sol-gel process. The structure of the sorbents has been determined by X-ray photoelectron spectroscopy
and IR spectroscopy. Their thermal stability has been assessed and the mechanism of their degradation has been elucidated.
The structural and adsorption parameters of the sorbents have been evaluated. The results demonstrate that the introduction
of amino groups into the structure of the polysiloxane yields an effective sorbent for Pb(II) extraction and enables Cu(II)
and Zn(II) separation from Co(II) and Ni(II). The thiourea-modified polysiloxane selectively sorbs Bi(III) (0.1–2 M HCl),
Pt(IV) (pH 2), and Pb(II) (pH > 3). Divalent Co, Ni, Cu, and Zn can be sorbed from alkaline solutions. 相似文献
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V. ŠvorčíK K. Ročková B. Dvořánková L. Brož V. Hnatowicz R. Ochsner H. Ryssel 《Journal of Materials Science》2002,37(6):1183-1188
Polyethylene (PE) was irradiated with 10 and 63 keV Ar+ ions to fluences of 1 × 1017 to 3 × 1019 m–2 and then it was grafted with aminoacid (alanine). The changes of surface polarity, electrical conductivity, and oxygen concentration were examined on pristine, as-irradiated, and irradiated-grafted PE. The in vitro adhesion of mice fibroblasts on the modified PE was evaluated 24 hours after inoculation. It was proved that for the PE irradiated at 10 keV ion energy, the presence of chemically bound alanine increases cell adhesion and its homogenity. For PE irradiated with 63 keV ions, however, the alanine grafting leads to a reduction of the number of adhering cells. It was found that a rising surface polarity increases cell adhesion, but when its value is too high the cell adhesion starts to decrease. No correlation between electrical conductivity and cell adhesion was observed. In general, higher cell adhesion is observed on modified PE in comparison with pristine one. 相似文献
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Ronald Rousseau 《Scientometrics》2011,87(1):171-174
It is shown that the observations made in a recent contribution by Savanur and Srikanth (Scientometrics 84:365–371, 2010) are not new. On the contrary much more refined collaboration measures have been proposed already in 1991 by Egghe. 相似文献
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ur Rahman Z Dong YL Ren C Zhang ZY Chen X 《Journal of nanoscience and nanotechnology》2012,12(3):2598-2606
Magnetic iron oxide nanoparticles were prepared by chemical co-precipitation method and then modified with sodium citrate. These iron oxide nanoparticles were characterized by transmission electron microscopy (TEM), X-ray diffractometer (XRD), and vibrating sample magnetometer (VSM). BSA was adsorbed on these citrate modified nanoparticles using two types of buffers (acetate buffer, pH 4.0, 4.7 and phosphate buffer, pH 7.4). The results showed that the maximum adsorption of BSA was 83 mg/g at its isoelectric point (pH 4.7). Fourier-transform infrared spectroscopy (FTIR) was used to confirm the attachment of citrate groups and BSA on the prepared magnetic nanoparticles. BSA was desorbed from nanoparticles under alkaline conditions, which was confirmed by SDS-PAGE electrophoresis, UV-vis and fluorescence spectra. The desorbed BSA showed small changes in its structure. The adsorption results indicated that BSA adsorption on citrate modified iron oxide nanoparticles occurred mainly by electrostatic mechanism. 相似文献
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《中国粉体技术》2017,(1):42-47
采用十六烷基三甲基溴化铵(CTAB)作为有机改性剂对阜新钙基膨润土进行有机改性;将膨润土原土(CaY-Bt)、精矿(CaJ-Bt)和有机改性膨润土(CTAB-Bt)分别与絮凝剂配合使用,通过XRD、FTIR、激光粒度分析及接触角测定,研究其对煤泥脱水作用的影响及机理。结果表明:CTAB进入蒙脱石层间,增大蒙脱石的层间距;Ca Y-Bt与絮凝剂配合使用后,煤泥脱水速率增加2.32 m L/s,滤饼水分减少1.84%,CaJ-Bt脱水速率增加0.62 m L/s,滤饼水分减少2.22%,CTAB-Bt脱水速率增加1.51 m L/s,滤饼水分减少4.95%;综合考虑脱水速率和滤饼水分,CTAB-Bt与絮凝剂配合使用为最佳方案。改性膨润土作用于煤泥表面,能增大煤泥疏水性,促进煤粒疏水聚团。 相似文献