烟气中多环芳烃吸附脱除的研究

针对热电厂烟气中排放的多环芳烃（PAHs）污染物，在实验室规模上研究了六种吸附剂对烟气中典型的PAHs, 如萘（Nap）、芴（Flu）、菲（Phe）的吸附脱除行为。考察了吸附剂结构特征与Nap，Flu，Phe高温脱除的相关性，并对煤质活性炭（AC-1）在160 ℃～200 ℃下的吸附等温线进行了研究。结果表明，吸附剂对PAHs的吸附能力与其结构参数中BET表面积和微孔体积具有紧密相关性，而与中孔体积没有明显关系；活性炭表现出很好的脱除烟气中PAHs的作用；吸附剂对PAHs的吸附能力随着PAHs的质量分数增大而增大，随吸附温度的增加而减小；随着PAHs的碳原子数和芳环数增加，其在吸附剂上的吸附能力也增强。     

Structural and electrical changes in NdSrNiO4−δ by substitute nickel with copper

A novel series of the formula NdSrNi_1−xCu_xO_4−δ were synthesized for various values of x ranging from 0 to 1 in 1 atm of O₂ gas flow using conventional solid-state methods and were characterized by powder X-ray diffraction and electrical resistivity measurements. The compounds have been shown to adopt the K₂NiF₄-type structure. The oxygen stoichiometry of the compounds was determined from thermo-gravimetric analysis (TGA). An analysis of the micro-structure of the neodymium strontium nickel copper oxide is described. All the samples were semi-conducting from room temperature down to 77 K. The effect of Cu²⁺ incorporation on the structural and electrical properties of NdSrNi_1−xCu_xO_4−δ, 0?x?1, are discussed in terms of Jahn-Teller distortion of the (Ni/Cu)O₆ octahedra and mixed valence character of copper.     

CeAgAs2 — a New Derivative of the HfCuSi2 Type of Structure: Synthesis,Crystal Structure and Magnetic Properties

Single crystals of CeAgAs₂ have been obtained by chemical transport reactions starting from a pre‐reacted powder sample. The crystal structure was solved using X‐ray diffraction (space group Pmca, No. 57, a = 5.7586(4) Å, b = 5.7852(4) Å, c = 21.066(3) Å, Z = 8) and refined to a residual of R(F) = 0.029 for 46 refined parameters and 1020 reflections. The structure of CeAgAs₂ represents a new distorted and ordered variant of the HfCuSi₂ type. The characteristic feature of this structure are infinite cis‐trans chains of As atoms with As—As distances of 2.563(1) Å and 2.601(1) Å. CeAgAs₂ is paramagnetic (μ_eff = 2.37 μ_B, θ = —10.5(2) K), with antiferromagnetic ordering at 5.5(2) K and exhibits a metamagnetic transition starting at 4.6 kOe and T = 1.8 K.     

Solvent intercalation in cobalt dimethylglyoximato complexes: A miniature host-guest system

When crystallized from appropriate solvents, the complex aqua-bis(dimethylglyoximato)nitrocobalt (III) may incorporate solvent molecules, thus forming a variety of mixed crystals. In the resulting host-guest crystals, the space groupP2_l/m and the packing motif of the pure host compound are retained. Lattice constantsa andb remain essentially unaltered upon intercalation, whereasc and the monoclinic angle depend largely on the clathrated guest. Space filling and intermolecular contacts are discussed.Dedicated to Professor Peter Paetzold at the occasion of his 60th birthday. A preliminary account of this work has been given at the Spring Meeting of the British Crystallographic Association, Newcastle upon Tyne, 1994.     

New Mixed-Valent Molybdenum Monophosphates with the KMo3P2O14 structure

New mixed valent molybdenum monophosphates AMo₃P₂O₁₄ have been synthesized for A = Ag, Rb, Na, Sr. The single crystal X-ray diffraction study of two of them (A = Ag, Sr) shows that they belong to the layer structure type KMo₃P₂O₁₄. Their structure consists of [Mo₃P₂O₁₄]_∞ layers involving MoO₆ octahedra and MoO₅ bipyramids, interleaved with A cations forming bicapped trigonal prisms AO₈. Bond valence calculations show a localisation of the Mo^V and Mo^VI species according to the formula A¹Mo^V_oct1Mo^VI_oct2Mo^VI_bipyP₂O₁₄ for A = Ag, Na and SrMo^V_oct1Mo^V_oct2Mo^VI_bipyP₂O₁₄. A comparison between the different Mo^V? Mo^VI phosphates is made.     

双（取代环戊二烯基）二氯化锆的晶体结构分析

用Ｘ－射线晶体结构衍射法测定了双［１－苄基－１－乙基丙基环戊二烯基］二氯化锆［η５－Ｃ５Ｈ４Ｃ（Ｃ２Ｈ５）２ＣＨ２Ｃ６Ｈ５］２ＺｒＣｌ２（Ｉ）及（１，２－二异丁基－１，２－甲基－乙基桥联）双环戊二烯基二氯化锆［η５－Ｃ５Ｈ４Ｃ（ＣＨ３）（Ｃ４Ｈ９－ｉ）Ｃ（ＣＨ３）（Ｃ４Ｈ９－ｉ）Ｃ５Ｈ４－η５］ＺｒＣｌ２（Ⅱ）的结构。二者皆为单斜晶系，（Ｉ）的空间群为Ｐ２／ｎ，ａ＝１２．５８２（３），ｂ＝７．９９２（２），ｃ＝１４．９７９（３）Ａ，β＝１０１．６８（１）°，Ｖ＝１４７４．９（９）Ａ３，Ｍｒ＝６１２．８４，Ｚ＝２，Ｄｘ＝１．３８ｇ／ｃｍ３，μ＝５．６９ｃｍ（－１），Ｆ（０００）＝６４０，Ｒ＝０．０３３，Ｒω＝０．０３６。（Ⅱ）的空间群为Ｃｃ，ａ＝１３．３０９（３），ｂ＝９．５９１（１），ｃ＝１６．４４９（８）Ａ。β＝４．８３（３）°，Ｖ＝２０９．２（２）Ａ３，Ｍｒ＝４５８．６３，Ｚ＝４，Ｄｘ＝１．４５６ｇ／ｃｍ３，μ＝７．７７ｃｍ（－１），Ｆ（０００）＝９５２，Ｒ＝０．０５１，Ｒω＝０．０６１。化合物（Ｉ）以重叠式存在，两个苄基处于反式。晶体（Ⅱ）以交叉式存在，甲基、异丁基以反式构象存在。     

Quecksilberverbindungen mit Cyancarbanionen. II. Synthese und Kristallstruktur von Diquecksilber(I)-bis(1,1,3,3-tetracyanpropenid)

Mercury Compounds with Cyancarbanions. II Synthesis and Crystal Structure of Dimercury(I)-bis(1,1,3,3-tetracyanpropenide) The structure of dimercury(I)-bis(1,1,3,3-tetracyanpropenide), Hg₂(tcp)₂, has been determined by single-crystal X-ray diffraction methods. The crystals are monoclinic, space group P 2₁/n. The unit cell dimensions are: a = 9.9193(3) Å, b = 5.6912(6) Å, c = 13.3806(4), β = 92.544(4)° and Z = 2. The mercury atoms in the centrosymmetric cation are three-coordinate with Hg? Hg 2.503, Hg? N 2.207, 2.207, 2.560 Å. tcp behaves as a bidentate ligand forming infinite chains running parallel to the a-axis.     

Synthesis and Crystal Structure of a Tetranuclear Complex Zinc(Ⅱ) with Schiff Base- [Zn(O)C_6H_4CH = NCH_2CH_2 (O)]_4

1INTRoDUrnoNSomecomplexessynthesizedaccordingtotheideaof"combiningtheinorganicdistOrtedpoyhedronwithasymmetricconjugateorganicmo1ecules"areacategoryof,..promisingnonlinearopticalmaterialtl3.Thecomplexcrystalsareundoubtedlyanewimportantfieldfortheexplorationoffrequencydoublingandotherfunctionalmateri-alswhichwillbecomethefocusoftheworld'sattentiont2i.Inordertostudytherela-tionshipbetweenthestructure,synthesis,propertiesandapplicationsfurthermore,wereportthesynthesisandcrystalstructureofanewt…     

电感耦合等离子体原子发射光谱法测定镍基单晶高温合金中Mo、W、Ta、Re、Ru时元素之间相互干扰的消除与校正的研究

称取镍基单晶高温合金0.100 0g于聚四氟乙烯烧杯中,先令其与盐酸9mL和硝酸1mL加热反应,待反应缓慢时滴加氢氟酸2mL并继续加热使样品完全溶解。加入500g·L^-1酒石酸溶液2mL,冷却至室温,在塑料容量瓶中加水定容至100.0mL。按仪器工作条件采用电感耦合等离子体原子发射光谱法测定其中5种合金元素(Mo、W、Ta、Re、Ru)的含量,选择分析谱线依次为204.598,207.911,240.063,197.312,240.272nm。结果发现:除了Re外,其余4种元素的测定中均受共存元素的光谱干扰,严重影响了测定结果的准确性。为克服其干扰,除了采用基体匹配法消除镍的基体干扰外,试验采用混合校正系数矩阵法对测定结果进行校准。通过一系列试验计算得到混合校准系数矩阵K,并应用于模拟样品的分析。结果表明:经过矩阵K的校准,所测定的5种元素的准确度显著提高,达到了消除共存元素之间光谱干扰的目的。通过精密度试验,测得上述5种元素测定值的相对标准偏差(n=11)均在1.5%以下,并通过标准加入法进行回收试验,测得5种元素的回收率为97.0%~105%。     

溶剂浓度对PVDF相转换膜大孔结构的影响

提出决定大孔能否发展的初始分相点处溶剂浓度临界点的概念 ,认为初始分相点处较高的溶剂浓度有利于大孔的发展 ,溶剂浓度低于一定的界限后 ,大孔停止发展 ,转为海绵状结构 .实验考察了不同凝胶液组成下制得的PVDF中空膜的结构 ,建立了相应的传质模型 ,模拟不同制膜条件下初生态膜内的组成分布情况 ,根据初始分相点处溶剂浓度临界点的概念 ,预测膜的形态结构 .模拟结果与相应制膜条件下的电镜照片有很好的对应关系 ,证明了上述大孔形成机理的正确性 .