复合型胺基吸附纤维及其对二氧化碳的吸附性能

将聚乙撑亚胺固化在玻璃纤维上,制得胺基吸附纤维.系统考察了不同原料比例下该吸附纤维的化学结构性能、热稳定性能及交换容量,测定了该吸附纤维的吸水率,在饱和水蒸汽和干燥条件下对CO2的吸附性能,以及作为CO2气体吸附材料的重复使用及再生性能.研究表明,适当的交联剂用量可使该吸附纤维250℃左右仍保持热稳定.该吸附纤维具有较高的交换容量,最高可达到3mmol/g以上;在饱和水蒸汽环境中,该吸附纤维对二氧化碳的吸附量可达20wt%以上,但吸附量随着交联程度的提高而减低.该吸附纤维具有良好的重复使用及再生性能,经再生使用后,吸附纤维对湿态CO2的吸附量变化不大.     

FFC-1离子交换纤维物理化学性能的研究

利用扫描电镜、热失重-红外、元素分析、低温氮吸附等技术和化学手段对聚羧酸基FFC-1离子交换纤维的结构与性能特点等进行了系统研究．结果表明：FFC-1离子交换纤维为含适量酰肼类交联键的聚羧酸(钠)型离子交换材料，外比表面积大和传质距离短是其反应动力学性能优异的主要原因，FFC-1纤维具有良好的化学与热稳定性。在5mol/L硫酸、硝酸、盐酸和2mol／L氢氧化钠溶液中浸泡，交换容量未见明显降低。但过氧化氢溶液对其功能基有明显破坏，CO2为FFC-1纤维在高温区间(300℃～350℃)的主要分解产物。     

PPS基叔胺离子交换纤维对Cr(Ⅵ)选择性吸附研究

首次报道通过氯甲基化聚苯硫醚纤维的胺化反应制得一种叔胺型离子交换纤维,研究了Cr2O72-和SO42-共存体系中该纤维对Cr(Ⅵ)的选择性吸附性能。结果表明,该离子交换纤维具有很高吸附容量,SO42-的存在并不影响该纤维对Cr(Ⅵ)的选择性吸附。在溶液pH值为2,Cr(Ⅵ)和SO42-浓度分别为65mg/L和480mg/L条件下,OH-型和SO42-型叔胺离子交换纤维对Cr(Ⅵ)的吸附容量分别为308.09mg/g和335.56mg/g。NaOH溶液可将CrO42-有效洗脱,纤维经过5次吸附-再生循环后,其吸附性能基本保持不变。     

离子交换纤维对含铬废水的资源化治理研究

对PAN基弱碱离子交换纤维在含铬废水资源化治理中的应用及多柱串联工艺条件进行了系统研究。实验结果表明,弱碱离子交换纤维对Cr(VI)的饱和吸附容量高达300mg/g以上,洗脱回收液中Cr(VI)浓度可达36.87~48.03g/L,其综合吸附性能明显优于结构与之相似的离子交换树脂;弱碱离子交换纤维具有很好的选择性富集性能,在多离子共存工业废水中,其对Cr2O72-、SO42-与Cl-的选择性系数分别为14.8和299.4;经多次吸附、再生循环后,弱碱离子交换纤维吸附容量基本不变,具有很好的实际应用前景。     

FFA—1离子交换纤维的物理与化学性能的研究

利用IR谱，热分析及SEM技术对FFA-1离子交换纤维的物理与化学性能进行了表征，测定了它的pH滴定曲线，吸水率，机械强度，对SO2的动态吸附以及气体阻力性能，为这种功能纤维在吸附净化有害气体等方面的实际应用提供了必要的性能参数。     

离子改性Y沸石吸附脱除二氧化碳中的乙醛

对比了纳米ZSM-5分子筛,5A分子筛,NaY分子筛,活性炭对二氧化碳中乙醛气体的吸附穿透性能,其中NaY穿透时间最长,与其较强的孔内极性和孔径大小有关。采用碱金属及碱土金属离子交换Y分子筛阳离子的方法改变其静电场强度,同时运用XRF、ICP手段对阳离子交换的Y分子筛进行了表征。结果表明,MgY的静电场最强,其乙醛穿透吸附量最大;程序升温脱附和再生实验表明,在150℃时,氮气吹扫4次再生后,MgY的乙醛穿透吸附量保持在550mg/g以上。     

FFA—1离子交换纤维对不同酸性气体吸附性能的研究

FFA－1离子交换纤维是一种弱碱性离子交换材料，本文对这种材料在波相和气相中对HF、SO2、HCl的静态和动态吸附与再生，水分与CO2对吸附的影响，以及它的耐酸、碱、氧化等性能进行了考查，对FFA－1纤维吸附HF分子的机理进行了初步探讨。实验表明：这种功能纤维在劳动保护以及有害气体吸附与净化等领域有着十分良好的应用前景。     

聚丙烯纤维预辐照接枝制备弱碱性离子交换纤维及其对链霉素的吸附

以γ-射线预辐照,在聚丙烯(PP)纤维上接枝丙烯酰胺(AAm),再经过Hofmarm降解反应制备弱碱性离子交换纤维(PP-g-YAm)交换容量达到5.47mmol/g干纤维.研究了PP-g-VAm纤维对链霉素的吸附和解吸性能.其吸附等温曲线符合Langmiur吸附等温式.静态吸附试验表明,PP-g-AAm纤维对链霉素的吸附量可以达到446.96mg/g千纤维,脱附率达到98.9%.     

聚羟基丁酸酯/碳纳米管复合纳米纤维膜的制备及其对重金属离子吸附分离性能的研究

以聚羟基丁酸酯和碳纳米管为原料,采用三氯甲烷/二甲基甲酰胺混合溶液为溶剂,利用静电纺丝技术制备了聚羟基丁酸酯/碳纳米管复合纳米纤维膜.研究了碳纳米管的含量对纳米纤维膜形貌和力学性能的影响,探讨了复合纳米纤维膜对重金属Cu(II)、Cd(II)和Pb(II)的吸附特性.实验结果表明:加入1 wt%碳纳米管能够将纳米纤维的平均直径从(728±146)nm降低至(468±89)nm,纳米纤维膜的比表面积从27.24 m~2/g提高至43.45 m~2/g;碳纳米管的复合能够有效增强聚羟基丁酸酯纳米纤维,当碳纳米管含量1 wt%为最佳,拉伸强度可达5.85 MPa,较纯聚羟基丁酸酯纳米纤维提升了115%.复合纳米纤维膜对重金属离子具有良好的吸附特性,其对Cu(II)、Cd(II)和Pb(II)的最佳吸附pH值为5,此时最大吸附容量分别为91.04、171.05和197.03mg/g,平衡吸附时间分别约为50、60和60 min,吸附率分别为1.79、2.83和3.28 mg/g/min;热力学和动力学分析表明,复合纳米纤维膜对重金属Cu(II)、Cd(II)和Pb(II)的吸附行为更符合Freundlich模型,吸附过程更符合Pseudo-second order模型;循环使用实验表明,重复使用5次后,其吸附容量可保持在初始值的87%以上,具有较好的使用寿命.     

漆酚镨高聚物吸附有害气体的性能研究

由漆酚和PrCl3在热溶液中合成的漆酚镨高聚物(PUPr),中心原子Pr(Ⅲ)的配位数并未达到饱和,具有进一步接受电子的能力.本文研究了Pr(Ⅲ)接受带孤对电子的有害气体SO2、HCHO、H2S和NH3作为配体的能力及其选择性.结果表明,PUPr对于电负性较大的硬碱配位体SO2的吸附性能较佳,且吸附速率较快,1h吸附量就达到4.05mmol/g.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.