胺固化环氧酚醛树脂对Hg~(2+)的吸附性能

螯合树脂能与金属离子形成稳定的配合物,在无机、冶金、分析药物、催化、海洋化学、放射化学、环境保护各领域都有非常重要的应用[1-3]。我们曾以酚醛树脂为大分子骨架与多胺反应制备了一系列螯合树脂并对其结构及对多种金属离子的吸附性能进行了探讨[4,5]。本文则以线型环氧酚醛树脂为大分子骨架、多乙烯多胺为固化剂,制备了五种不同氮含量的氨基环氧酚醛螯合树脂,并考察其对金属离子Ｈｇ2+的吸附性能。1　实验部分1.1　仪器与试剂ＮｉｃｏｌｅｔＭＡＧＮＡ ＩＲ550(ＳｅｒｉｅｓＩＩ)红外分光光度计,ＳＨＡ-Ｃ水浴恒温振荡器,ＰＥ2000…     

含硫弱酸性酚醛树脂对Ag+的吸附性能

含硫配位原子的螯合树脂对过渡金属离子尤其是贵金属离子具有良好的吸附性能[1]。螯合树脂的母体交联聚苯乙烯、聚甲基丙烯酸甲酯[2]具有疏水性,即使引入螯合基团其疏水性仍很强,对在水溶液中的吸附很不利。而含有酚醛骨架的螯合树脂具有亲水性[3]。本文以酚醛树脂为大分子骨架,通过化学反应连接上具有强配位原子硫的巯基羧酸,研究了该巯基弱酸性酚醛树脂对Ag+在各种条件下的吸附性能。1　实验部分1 1　仪器与试剂NicoletMAGNA550(SeriesⅡ)红外光谱仪,SHA C水浴恒温振荡器,3200原子吸收分光光度计,JSM 5600LV扫描电镜,Quest.le…     

磁性功能化酚醛树脂的合成及对金属离子的吸附性能

磁性功能化酚醛树脂的合成及对金属离子的吸附性能;环氧酚醛树脂;螯合;金属离子;溶胀;吸附容量;吸附动力学     

胺修饰酚醛树脂对酸性橙Ⅱ的吸附性能研究

研究了自制胺修饰酚醛树脂(AMPF)对水溶性染料酸性橙II的吸附性能,探讨了pH值、温度、浓度等因素对酸性橙吸附性能的影响。结果表明,AMPF与市售大孔树脂D296和D301相似,对酸性橙均具有较强的吸附能力。温度升高有利于AMPF对酸性橙的吸附;酸性橙浓度升高,吸附量增大。AMPF对酸性橙的吸附符合Boyd液膜扩散控制。各种树脂对酸性橙的平衡吸附数据符合Langmuir方程和Freundlich等温式,其相关系数大于0.98,n均大于1,表明为优惠吸附。     

明胶-环氧聚醚胺交联膜的合成及其对重金属离子的吸附性能

首先利用聚乙二醇二缩水甘油醚(PEO-DE)、聚二甲基硅氧烷二缩水甘油醚(PDMSDE)与无水哌嗪以1∶1∶1的物质的量之比反应合成环氧封端的聚醚胺(ePEA),然后将ePEA分散在水相中与明胶混合,浇铸固化成膜。利用红外光谱(FT-IR)、X射线衍射(XRD)、示差扫描量热法(DSC)和原子吸收光谱(AAS)等手段研究了明胶-环氧聚醚胺交联膜的结构和离子吸附性能。结果表明,与纯明胶膜相比,交联膜中的环氧聚醚胺与明胶之间出现了新的化学交联结构,在水溶液中的稳定性提高;交联膜对Cu2+、Pb2+、Cd2+均有一定的吸附作用,并且吸附能力随着ePEA含量的增加而增加;吸附过程符合二级动力学模型和Langmuir等温模型。     

一种PAN基偕胺肟螯合纤维对重金属离子的吸附性能

利用有限浴技术对一种PAN基偕胺肟螯合纤维的吸附性能进行了系统研究。结果表明:由于该功能纤维材料含胺肟及多烯多胺双重功能基,因此对Cu2+、Ni2+、Co2+、Hg2+等重金属离子具有很好吸附性能。交联型偕胺肟螯合纤维物理化学性能良好,洗脱再生简便,可望用于湿法冶金及重金属离子工业废水的资源化治理等领域。     

胺化木质素对水中硝基苯吸附性能的研究

含硝基苯的工业废水对环境造成了严重的污染.本文用环氧氯丙烷、乙二胺对碱木质素进行改性制备胺化木质素,详细研究了溶液pH、接触时间、温度、浓度等因素对胺化木质素吸附水溶液中硝基苯性能的影响.结果表明:溶液pH对吸附有较大的影响,吸附的最佳pH为8,胺化木质素对硝基苯吸附3h后达到平衡,与准一级吸附动力学模型有较好的拟合;...     

多胺型螯合树脂对Au（Ⅲ）的吸附性能

研究了含有多胺型螯合树脂FQ－34对Au(Ⅲ）的吸附性能。结果表明，该树脂可在Cu^2 ,Ni^2 ,Zn^2 ,Pb^2 等共存离子存在下选择吸附Au( Ⅲ），其吸附选择系数可达98％以上。     

聚苯乙烯负载聚酰胺-胺型螯合树脂对Hg2+的吸附分离性能

以聚苯乙烯负载聚酰胺-胺型螯合树脂为吸附剂,确定了金属离子溶液的pH值及流速;洗脱液的流速.浓度及酸度等最佳柱实验条件,测定了以Na 、Mg2 、Ca2 、Ba2 、Ni2 、Cd2 ,Pb2 、Cu2 、Zn2 等金属离子作为干扰离子时谊吸附荆对Hg2 的回收率.实验结果表明,该树脂对Hg2 具有较高的吸附选择性,从二元金属离子混合液中对Hg2 的回收率达到85.3%以上.     

Solid-supported [2+2+2] cyclotrimerizations

The transition-metal-catalyzed [2+2+2] cyclotrimerization of a diyne and an alkyne provides a convergent route to highly-substituted aromatic rings. This reaction possesses distinct drawbacks, especially low chemo- and regioselectivities, which hamper its application in combinatorial synthesis. These problems have been solved by the development of solid-supported [2+2+2]-cycloaddition reactions. If conducted on a solid-support, this reaction enables rapid combinatorial access to diverse sets of carbo- and heterocyclic small-molecule arrays. The scope of this methodology has been investigated by examining different immobilization strategies, different diyne precursors, and a variety of functionalized alkyne reaction partners. Overall, isoindoline, phthalan, and indan libraries were assembled in good to excellent yields and with high purities.     

A photoionization study of the charge transfer reactions: Xe+ + O2 → O+2 + Xe and O+2 + Xe → Xe+ + O2

Photoionization mass spectrometer techniques have been employed to study the charge transfer reactions: Xe⁺ + O₂ → O⁺₂ + Xe and O⁺₂ + Xe → Xe⁺ + O₂. The results show the reaction of Xe⁺(²P_{$\text{3}\text{2}$}) ions with O₂ molecules is much more efficient than the reaction of Xe⁺(²P_{$\text{1}\text{2}$}) ions with O₂ molecules. The charge transfer reaction of O⁺₂ ions with Xe atoms was detected for O⁺₂ ions in the a ⁴Π_u state.     

Intracellular Ruthenium-Promoted (2+2+2) Cycloadditions

Metal-mediated intracellular reactions are becoming invaluable tools in chemical and cell biology, and hold promise for strongly impacting the field of biomedicine. Most of the reactions reported so far involve either uncaging or redox processes. Demonstrated here for the first time is the viability of performing multicomponent alkyne cycloaromatizations inside live mammalian cells using ruthenium catalysts. Both fully intramolecular and intermolecular cycloadditions of diynes with alkynes are feasible, the latter providing an intracellular synthesis of appealing anthraquinones. The power of the approach is further demonstrated by generating anthraquinone AIEgens (AIE=aggregation induced emission) that otherwise do not go inside cells, and by modifying the intracellular distribution of the products by simply varying the type of ruthenium complex.     

Alkenes in [2+2+2] Cycloadditions

Participation of alkenes and allenes in [2+2+2] cycloaddition reactions has attracted much attention recently. This version of the well‐established alkyne cyclotrimerization renders interesting products, such as cyclohexadienes and other polycycles, through cascade processes. Many mechanistic variations are observed when using certain metal complexes as catalysts. The frequent generation of stereogenic centers has prompted the development of efficient asymmetric versions. This Minireview summarizes the efforts reported to date on the use of double bonds as partners in [2+2+2] cyclotrimerizations.     

Studies on Synthetic Inorganic Ion Exchangers-III Quantitative Separations of Mg2+ -Pb2+, Zn2+ - Pb2+ Cu2+ - Pb2+, Al3+ - Pb2+, Zn2+ - Cd2+, and Mg2+ - Cd2+ on Lead Antimonate Columns

Abstract

A new inorganic ion exchanger, lead antimonate has been synthesized having an Pb:Sb ratio of 1:5 and cation exchange capacity of 1.46 mequiv./g. It is fairly stable in water and dilute solutions of acids, bases and salts. Ion distribution studies on twenty metal ions have been determined on this gel at pH 1,2,3 and 5. The following mixtures have been separated: Mg²⁺ - Pb²⁺, Zn²⁺ - Pb²⁺, Zn²⁺ - Pb²⁺, Cu²⁺ - Pb²⁺, Al³⁺ - Pb²⁺, Zn²⁺ - Cd²⁺ and Mg²⁺ - Cd²⁺. Mg²⁺ and Al³⁺ were removed with 0.4 M ammonium nitrate, Cu²⁺ and Zn²⁺ with 0.4 M ammonium nitrate + 0.1M nitric acid (1:1), Pb²⁺ with 0.5M nitric acid and Cd²⁺ with 0.25M nitric acid. A tentative structure of this material is proposed on the basis of chemical analysis, pH titrations, thermogravimetry and IR spectrophotometry.     

Triptycenediols by rhodium-catalyzed [2+2+2] cycloaddition

An efficient, modular synthesis of triptycene derivatives is presented, in which the triptycene ring system is constructed from readily available anthraquinone and alkyne starting materials. A rhodium-catalyzed alkyne cyclotrimerization reaction serves as the key step in this new method for the preparation of these useful unnatural products.     

Formal [(2+2)+2] and [(2+2)+(2+2)] nonconjugated dienediyne cascade cycloadditions

[reaction: see text] Fluoranthene 2 and heptacycle 3 are easily accessible from the reaction of diyne 1 and norbornadiene (NBD) in the presence of the rhodium catalyst. The unusual [(2+2)+(2+2)] adduct 3 was confirmed by the X-ray crystal structure analysis.     

Pyridines via solid-supported [2 + 2 + 2] cyclotrimerization

The formation of pyridines via a crossed [2 + 2 + 2] cycloaddition has been achieved on a solid-support for the first time.     

Tethered 2 + 2 + 2 cycloaddition reactions of cobalt-cycloheptyne complexes

Cycloheptyne-dicobalt hexacarbonyl complexes, substituted by propargylic ether functions, undergo 2 + 2 + 2 cycloaddition reactions with alkynes to give tricyclic benzocycloheptanes; an all-intramolecular version of this transformation is also possible.