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1.
将TiO2 光催化剂用于染料废水脱色处理的工作近几年研究的较多。在可作为光催化剂的N 型半导体中 ,TiO2 性质最优。曹曼等人[1] 用TiO2 作催化剂 ,研究了水中活性艳红K 2G的光催化氧化机理 ,Mattews[2 ] 将TiO2 粉末固定于某一载体上 ,其催化活性比粉末状高 ,YuZhigong等[3]对TiO2 的催化机理进行了研究。有学者指出 ,由于电子 空穴对产生的时间短 ,为防止其自发合并 ,可在半导体中加入导体物质 ,有利于电子与空穴转移并延长分离时间 ,TiO2 的催化活性有明显提高。但在这些研究中都使用了紫外光作为… 相似文献
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阳离子淀粉吸附脱色性能的研究 总被引:5,自引:0,他引:5
本文对阳离子淀粉(CST)的吸附性能进行了系统的研究。实验表明阳离子淀粉对各种阴离子染料的吸附,主要是化学吸附。在pH为2~8范围内和室温下,对不同结构的阴离子染料均有一定吸附脱色效果。 相似文献
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纳米TiO2/碳化树脂复合催化剂的合成及其光催化性能研究 总被引:10,自引:0,他引:10
利用一种简单、快速的方法合成了纳米TiO2/碳化树脂(B)复合催化剂,对其组成、结构、尺寸及其光催化性能进行了表征.结果表明,该复合材料为由碳、氢、氧和钛等4种元素组成的纳米材料,尺寸约30nm,其中Ti和O的堆积结构为锐钛矿型;在该复合材料中,B为具有活性基团和不同长度碳-碳共轭链的大分子,且与TiO2之间存在着某种化学作用,复合材料所具有的特殊电子结构不仅使其能吸收紫外-可见区的全程光波,而且对光生电荷具有很高的分离能力,从而表现出较高的光催化活性. 相似文献
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多级流化床吸附的味精脱色除铁研究 总被引:1,自引:0,他引:1
本文提出并研究了中和液与结晶母液混合进料,TPCIX柱多级流化混合床吸附的味精脱色除铁新工艺。研究了K15+122混合吸附剂脱色除铁的适宜工艺条件并考察了TPCIX(Tipping Plate Continuous Ion Exchange Contractor)柱的工艺运转。新工艺对提高99%味精产率和总收率,改善技术经济指标具有建设性的意义。 相似文献
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本文证实了茶叶经化学处理后,可以吸附水中阳离子型染料。三种染料的脱色率均在90%以上。吸附后的茶叶可以再生处理,循环使用。 相似文献
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表面键联型TiO2/SiO2固定催化剂的结构及催化性能 总被引:9,自引:1,他引:8
采用浸渍法制备了表面键联型TiO2/SiO2固定化光催化剂。XRD,FT-IR,XPS和BET比表面积测定结果表明,TiO2通过Ti-O-Si联结负载于多孔硅胶的表面,由此提出TiO2/SiO2的结构模型,考察了多孔硅胶的粒度及氧化钛负载量对催化剂活性的影响,对活性艳红K-2G(R15)的光催化脱色反应,最佳的光催化剂30%TiO2/SiO2(Ims30)比B-TiO2粉末的催化速率快3倍,随着载体粒度的减小,催化剂的比表面积增大,催化活性升高;多孔硅胶不仅起着支持体的作用,而且具有分散的作用;多孔硅胶具有很好的透光性,经ζ-电位测定,所制备催化剂的等电点为3.0pH单位,表明催化剂表面呈酸性。 相似文献
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phase diagrams of KCl-KBO2-K2CO3, K2MoO4-KBO2-K2CO3, and K2WO4-KBO2-K2CO3 ternary systems were studied by a calculation-experimental method and differential thermal analysis (DTA). The coordinates
of ternary eutectics were determined to be E
1: 622°C, 8.5 mol % KBO2, 56.5 mol % KCl, and 35 mol % K2CO3; E
2: 710°C, 23 mol % KBO2, 43 mol % K2CO3, and 34 mol % K2MoO4; E
3: 710°C, 23 mol % KBO2, 43 mol % K2CO3, and 34 mol % K2WO4. The specific heats of melting of the eutectics were determined. 相似文献
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S. F. Kudryashov O. S. Kudryashova L. P. Filippova 《Russian Journal of Inorganic Chemistry》2010,55(4):594-601
Solubility in the Na2Cr2O7-(NH4)2Cr2O7-K2Cr2O7-H2O four-component water-salt system at 25, 50, and 75°C was studied for the first time. Phase field boundaries for individual
salts and potassium and ammonium dichromate solid solutions, monovariant lines, and invariant points were determined. Experimental
data were used to optimize the looped isohydric process of potassium dichromate preparation involving additional salts. 相似文献
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一些具有NASICON型网格结构的固体电解质具有高的电导率和好的稳定性,NASICON的意思是Na Super Ionic Conductor[1]。当NaZr2(PO4)3中P5 被Si4 部分取代时便可以得到具有NASICON结构的Na1 xZr2SixP3-xO12体系,其具有高的钠离子电导率。然而有相同结构的Li1 xZr2SixP3-xO12体系的离子电导率却很低,这是因为Li 半径太小,而NASICON三维网格结构的离子通道太大,两者不匹配而使电导率下降[2]。但当LiZr2(PO4)3中Zr4 被离子半径小些的Ti4 取代,所得LiTi2(PO4)3的通道就与Li 半径相匹配,适合于锂离子的迁移,从而使其电导率… 相似文献
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Richard R. Schrock 《Journal of organometallic chemistry》1976,121(3):373-379
MMe5(dmpe) (M = Nb or Ta, dmpe = Me2PCH2CH2PMe2) reacts with H2 (500 atm) and dmpe in THF at 60°C to give MH5(dmpe)2? NbH5(dmpe)2 readily reacts with two mol of CO or ethylene (L) to give NbHL2(dmpe)2. The exchange of the hydride ligand with the ethylene protons in NbH(C2H4)2(dmpe)2 is not rapid on the 1H NMR time scale (60 MHz) at 95°C. 相似文献
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Zh. A. Kochkarov M. V. Khubaeva I. A. Shogenov Z. L. Khakulov 《Russian Journal of Inorganic Chemistry》2011,56(6):946-953
The phase diagrams of the NaBO2-NaCl-Na2CO3, NaBO2-Na2CO3-Na2MoO4, NaBO2- Na2CO3-Na2WO4, and NaBO2-NaCl-Na2WO4 ternary systems were studied by a calculation-experimental method and differential thermal analysis. The coordinates of ternary
eutectics were determined: E
1: 612°C, 16 mol % NaBO2, 42 mol % NaCl, and 42 mol % Na2CO3; E
2: 568°C, 12 mol % NaBO2, 28 mol % Na2CO3, and 60 mol % Na2MoO4; E
3: 575°C, 12 mol % NaBO2, 32 mol % Na2CO3, and 56 mol % Na2WO4; E
4: 628°C, 8 mol % NaBO2, 20 mol % NaCl, and 72 mol % Na2WO4; and E
5: 655°C, 9 mol % NaBO2, 53 mol % NaCl, and 38 mol % Na2WO4. 相似文献
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本文用高精度数字式振荡管密度计测定了288K至318K温度范围内Li2SO4 + Na2SO4 + H2O和 Li2SO4 + K2SO4 + H2O三元体系的密度。混合溶液的离子强度范围从0.1到4.5 mol.kg–1,混合溶液中Na2SO4和K2SO4的离子强度分数为0.2,0.4,0.6和0.8。用密度实验值拟合得到了不同温度下Pitzer离子相互作用模型混合参数θV和 ψV,模型的计算值与实验值的偏差在±0.002 g.cm–3以内。用Pitzer模型计算了不同离子强度下三元体系的混合体积。 相似文献
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The novel, 1D semiconductor (H2NC4H8NCH2CH2NH2)(HNCH2CH2NH2)3Zn2Ge2Se8 has been synthesized under solvothermal conditions using N-(2-aminoethyl)piperazine as solvent and templating agent at 200 °C. The material was characterized by single crystal and powder X-ray diffraction, IR and Raman spectroscopy and thermogravimetric analysis. The compound consists of 1D anionic [Zn2Ge2Se8]4− chains made of alternating edge-shared [ZnSe4] and [GeSe4] tetrahedra that charged balanced by one N-(2-aminoethyl)piperazinium and three piperazinium cations. The optical properties were investigated with solid state UV–Vis/near IR spectroscopy and the results show that the solid is a medium gap semiconductor with an absorption edge at 1.8 eV. 相似文献
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Alberto Escudero 《Journal of solid state chemistry》2007,180(4):1436-1445
This paper examines the structural changes with temperature and composition in the Sc2Si2O7-Y2Si2O7 system; members of this system are expected to form in the intergranular region of Si3N4 and SiC structural ceramics when sintered with the aid of Y2O3 and Sc2O3 mixtures. A set of different compositions have been synthesized using the sol-gel method to obtain a xerogel, which has been calcined at temperatures between 1300 and 1750 °C during different times. The temperature-composition diagram of the system, obtained from powder XRD data, is dominated by the β-RE2Si2O7 polymorph, with γ-RE2Si2O7 and δ-RE2Si2O7 showing very reduced stability fields. Isotherms at 1300 and 1600 °C have been analysed in detail to evaluate the solid solubility of the components. Although, the XRD data show a complete solid solubility of β-Sc2Si2O7 in β-Y2Si2O7 at 1300 °C, the 29Si MAS-NMR spectra indicate a local structural change at x ca. 1.15 (Sc2−xYxSi2O7) related to the configuration of the Si tetrahedron, which does not affect the long-range order of the β-RE2Si2O7 structure. Finally, it is interesting to note that, although Sc2Si2O7 shows a unique stable polymorph (β), Sc3+ is able to replace Y3+ in γ-Y2Si2O7 in the compositional range 1.86?x?2 (where x is Sc2−xYxSi2O7) as well as in δ-Y2Si2O7 for compositions much closer to the pure Y2Si2O7. 相似文献
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W. Li M. Wang Z. H. Li X. F. Shang H. Wang Y. W. Wang Y. B. Xu 《Russian Journal of Electrochemistry》2007,43(11):1279-1283
The lithium-ion-conducting inorganic solid electrolytes in the oxide systems Li2O-SiO2-P2O5 and Li2O-TiO2-SiO2-P2O5 were prepared by the solid-state reaction, and the electrolyte pellet made by cold-pressing method had diameter of 13 mm
and was about 1 mm thick. Phase identification and surface morphology of the products were carried out by X-ray diffraction
and scanning electron microscopy. Ionic conductivity of the pellets was investigated through ac impedance. The results show
that the adding of other cations can improve the ionic conductivity of the solid electrolyte, and the sintering temperature
and duration can influence the ionic conductivity. The maximum ionic conductivity in the samples is 9.9 × 10−4 S/cm in the Li2O-TiO2-SiO2-P2O5 system.
Original Russian Text ? W. Li, M. Wang, Z.H. Li, X.F. Shang, H. Wang, Y.W. Wang, Y.B. Xu, 2007, published in Elektrokhimiya,
2007, Vol. 43, No. 11, pp. 1341–1345. 相似文献
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The Tl2S-Sb2S3-Bi2S3 quasi-ternary system (system A) was studied using DTA, X- ray powder diffraction, microstructure examination, and microhardness measurements. TlSbS2-Tl4Bi2S5(TlBiS2, Bi2S3), Sb2S3-TlBiS2, Tl3SbS3-TlBiS2(Bi2S3), and [TlSb0.5Bi0.5S2]-Tl2S isopleths; isothermal sections at 500 K; and liquidus surface projection of system A were constructed. Characteristic features of the title system are extensive fields of solid solutions extended along the
TlSbS2-TlBiS2 quasi-binary section and a continuous solubility belt 1–2 mol % wide extended along the Sb2S3-Bi2S3 binary subsystem. Primary separation fields of phases and the types and coordinates of invariant and monovariant equilibria
in system A were determined. 相似文献