新型层柱材料ZnAl─CuW11In的合成、表征及催化活性

本文用水热离子交换法首次将中心原子为铜的钨系取代型杂多阴离子［ＣｕＷ１１Ｏ３９Ｉｎ（Ｈ２Ｏ）］＾７－嵌入ＺｎＡｌ型阴离子粘土层间，通过ＸＲＤ、ＩＲ及ＥＳＲ等对柱撑产物进行了表征。ＸＲＤ研究表明柱撑产物的底面间距为１．７５ｎｍ，通道高度达１．２８ｎｍ。ＥＳＲ结果显示杂多阴离子进入粘土层间后ＣｕＯ４四面体中Ｃｕ－Ｏ键的共价性减弱。催化实验表明柱撑产物对邻苯二甲酸二辛酯（ＤＯＰ）的合成反应有较好的催化活     

氟钒锰共掺对TiO2柱撑膨润土光催化脱硝性能的影响

采用溶胶-凝胶法制备氟钒锰共掺改性的TiO₂柱撑膨润土，使用XRD、氮吸附、UV-vis光谱和SEM等手段对其进行了表征测试，并对其室温下的可见光催化脱硝性能进行了评价研究。结果表明，对于NO质量浓度为661 μg/m³的气体，F-V-Mn共掺TiO₂柱撑膨润土的光催化脱除效率近似达到100%，而NO质量浓度提升至1657 μg/m³时，光催化效率为81.9%，与未柱撑的F-V-Mn共掺TiO₂相比提高了33.8%。F-V-Mn共掺TiO₂柱撑膨润土上光催化脱反应速率常数最大，是V-Mn共掺TiO₂柱撑膨润土的2倍，且前者的抗水和抗SO₂中毒能力也更强。TiO₂柱撑不仅保留了膨润土的片状晶体结构，而且使膨润土层间距由0.667 nm增大至0.710 nm，吸附能力增强；同时，掺杂元素能抑制TiO₂金红石相生长，降低TiO₂禁带宽度，提高可见光响应，延长使用寿命，拓宽应用范围。     

Photodegradation of dye pollutants on TiO_2 pillared bentonites under UV light irradiation

TiO2 pillared bentonite samples dried under different conditions are used to degrade 2,4-dichlorophenol and orange II under UV light irradiation. The supercritical dried sample exhibits a high activity for the photodegradation of 2,4-dichlorophenol and orange II due to its structural features. TOC and COD are measured during the degradation of 2,4-dichlorophenol under UV light irradiation using P25 and TiO2 pillared bentonite samples dried under different conditions. The clay-based catalysts can be readily separated by filtration or sedimentation.     

Order Parameters of β-Substituted Anthraquinone Dyes I: 1-Amino-4-Hydroxyanthraquinone Derivatives

A study is presented of the optical order parameters and spectroscopic properties of I-amino-4-hydroxyanthraquinone derivatives containing various substituents in the 2-position in a nematic liquid crystalline mixture composed of cyanophenylcyclohexane derivatives. The results are discussed in terms of the effects of the dye structure on the order parameters. By introducing a-SCH₂-group into the 2-position, magenta dyes have been obtained which show high order parameters and solubilities. In addition, preliminary data on the solubility and photostability of the dyes are reported.     

TiO2柱撑膨润土对染料茜素红的吸附行为

TiO2柱撑膨润土对染料茜素红的吸附行为;柱撑膨润土;吸附;茜素红;动力学;热力学     

Construction of visible-light-responsive metal–organic framework with pillared structure for dye degradation and Cr(VI) reduction

A water-stable mixed-linker metal–organic framework (MOF) was rationally synthesized using a controllable pillared-layer method. The prepared Co(II)–MOF shows wide-range absorption in the visible light region due to the incorporation of highly conjugated anthracene-based bipyridine ligand. Experiments suggest that the MOF is highly efficient for the photoreduction of toxic Cr(VI) ions in water under visible light. Important issues affecting photocatalytic performance, such as the influence of pH and the control of electron–hole separation by scavenger, were carefully examined. Beyond Cr(VI) ions, we also explored the photocatalytic degradation performance of the MOF using a persistent azo dye as a model substrate, where H₂O₂-involved advanced oxidation process was applied. Control experiments suggest that the introduction of environmentally benign H₂O₂ significantly enhances the degradation performance due to the generation of reactive hydroxyl radicals. The study not only demonstrates the great feasibility of the preparation of a new MOF photocatalyst through a controllable pillared-layer method, but also reveals that rational functionalization of ligand in the MOF is convenient for achieving desirable applications.     

Mg-Ni-Al-EDTA柱撑LDHs层状材料的水热合成、结构及性能

以Mg(NO3)2.6H2O、Ni(NO3)2.6H2O、Al(NO3)3.9H2O和[CH2N(CH2COOH)2]2为原料,采用水热合成法,合成了Mg-Ni-Al三元EDTA柱撑LDHs层状材料。采用ICP、元素分析仪、XRD、FTIR、TG-DSC、SEM等手段对样品进行了表征。探讨了pH值、反应温度、反应时间和原料配比对EDTA柱撑LDHs材料合成的影响。结果表明,在pH=8、反应温度控制在140℃、反应时间为24 h时,可以合成出结构规整、晶形良好、各层间排列紧密有序的含不同比例金属阳离子的EDTA柱撑LDHs材料。Mg-Ni-Al三元EDTA柱撑LDHs层状材料通过层间EDTA对Co2+的螯合作用,可以在较短时间内吸附溶液中的Co2+,去除率在97%以上。pH值、吸附时间、吸附温度、固体投加量及初始Co2+浓度对去除率均有不同程度的影响。     

新型层柱化合物合成、表征及催化活性

将含过氧铌一、三取代钨硅、钨磷过氧杂多阴离子利用离子交换法嵌入Zn2Al类水滑石中制得层柱化合物,利用XRD,IR,UV等方法对产物的结构进行了表征。结果表明在层柱化合物中过氧杂多阴离子仍然保持Keggin结构,并且过氧键没被破坏。层柱化合物在酯化反应中显示优良的催化性能。     

CdS柱撑钛铌酸介孔复合材料的制备与光解水制氢活性

以钛铌酸纳米片层为主体,CdS纳米颗粒为客体,通过剥离-重堆积法合成了不同投料比的CdSTiNbO₅介孔复合材料,材料的层间距为1.19nm,比表面积约为93m₂·g^-1.CdSTiNbO₅复合材料表现出良好的光解水制氢活性,当投料比n_CdS/n_HTiNbO5=1:2时,复合材料在模拟太阳光和可见光下的产氢速率分别为231和184μmol·h^-1·g^-1,是CdS的8.6和9.7倍.复合材料光催化活性的提高归因于比表面积的增加和光生载流子的有效分离.     

Incorporation of Pure Fullerene into Organoclays: Towards C60‐Pillared Clay Structures

In this work, we demonstrate the successful incorporation of pure fullerene from solution into two‐dimensional layered aluminosilicate minerals. Pure fullerenes are insoluble in water and neutral in terms of charge, hence they cannot be introduced into the clay galleries by ion exchange or intercalation from water solution. To overcome this bottleneck, we organically modified the clay with quaternary amines by using well‐established reactions in clay science in order to expand the interlayer space and render the galleries organophilic. During the reaction with the fullerene solution, the organic solvent could enter into the clay galleries, thus transferring along the fullerene molecules. Furthermore, we demonstrate that the surfactant molecules, can be selectively removed by either simple ion‐exchange reaction (e.g., interaction with Al(NO₃)₃ solution to replace the surfactant molecules with Al³⁺ ions) or thermal treatment (heating at 350 °C) to obtain novel fullerene‐pillared clay structures exhibiting enhanced surface area. The synthesized hybrid materials were characterized in detail by a combination of experimental techniques including powder X‐ray diffraction, transmission electron microscopy, X‐ray photoemission, and UV/Vis spectroscopy as well as thermal analysis and nitrogen adsorption–desorption measurements. The reported fullerene‐pillared clay structures constitute a new hybrid system with very promising potential for the use in areas such as gas storage and/or gas separation due to their high surface area.