Functionalization Of Cucurbita[6] Uril And Application Of Its Nanocomposites

Cucurbit[n]uril is a supramolecular amphiphilic compound with ultra-high mechanical stability and thermal stability.The cucurbituril is composed of an even number of glycoluril units,which are non-polar as a whole,insoluble in water and most organic solvents,so the most basic research direction in this field is to functionalize it.The three methods that have been mastered at present:the first one is to use a cavity of cucurbituril to encapsulate a guest molecule of a suitable size or matched with a pro-and hydrophobic interaction to form a host-guest compound;The second is to form a complex by ion-dipole interaction between a negatively charged carbonyl port and a metal cation or an organic cation;The third is to prepare a cucurbit[n]uril derivative by direct substitution or indirect substitution?substitution on the glycoluril unit before synthesis,followed by polymerization?,and the meaning of the derivative is not limited to the functionalization of CB[n]itself.The expansion,more importantly,can continue to derivatize and aggregate development based on this.In this paper,the following three parts of experiments are carried out around the three functional modes:?1?We have successfully inserted the"casing"type host-guest organic complex cucurbit[6]uril-butylamine salt?CB[6]-BA?into the interbeds of two clay materials by hydrophobic interaction and ion exchange.The material is synthetic Laponite?LN?and calcium-montmorillonite?Ca-MMT?,The modified LN material in the two materials has obvious adsorption effect on the methylene blue?MB?dye solution.The characterization results show that the adsorption process is chemical monolayer adsorption,and the adsorption efficiency is high in the environment of low ionic strength and high pH.The highest and modified adsorbent can be reused,which has practical application value for the treatment of organic dye wastewater.?2?We have prepared a CB[6]-Ce³⁺complex by utilizing the special nature of the ionic-dipole interaction between the carbonyl port of CB[6]and the metal ion.The characterization results indicate that the complex is in a layered film-like structure in water.And two kinds of cylindrical holes having a diameter of about 0.7?m and 4 to 5?m are uniformly distributed on the film.The material was applied to the adsorption degradation process of azocarmine B?AZ-B?dye,showing obvious effects.The adsorption process is a process in which the dye molecules diffuse into the monolayer structure of the adsorbent material and are captured by the cylindrical pores in the sheet.The adsorption efficiency is highest in an environment with low ionic strength and neutral pH.Based on the interaction between CB[6]and Ce,CB[6]was used as a structure directing agent.CeO₂ was prepared by two methods,namely precipitation method and hydrothermal method,and the conditions in the preparation process were changed.The best product formation conditions were determined by TEM and SEM.The results show that CB[6]can effectively regulate the structure and morphology of CeO₂ materials.?3?We successfully prepared the oxidized hydroxyl group CB[6]and the oxidized hydroxyl group CB[7]at the waist by the"Fenton oxidation method".The characterization results show that with the increase of the dosage of H₂O₂,the increase of Fe²⁺dosage,the prolongation of reaction time and the increase of reaction temperature increase the oxidation degree of CB[n]-?OH?n.Solubility experiments showed that all samples were dissolved in NaCl solution,and the solubility of the sample in water gradually decreased with the increase of the oxidation degree of the product CB[n]-?OH?n?it is different from CB[6]which CB[7]has water solubility?,and the solubility in DMSO is gradually increased.Summarize the experimental conditions CB[6]:H₂O₂=1:8 ratio:0.25 times Fe²⁺and 1 times HCl dosage can be prepared to prepare high purity CB[6]-?OH?₁;CB[6]:H₂O₂=1:8 ratio,high purity CB[6]-?OH?₂ can be prepared under the conditions of 0.25 times Fe²⁺and 1 times HCl dosage;At a ratio of CB[6]:H₂O₂=1:8,high purity CB[6]-?OH?₆ can be prepared by superimposing 3 times under the conditions of 0.25 times Fe²⁺and 1 times HCl dosage;At a ratio of CB[7]:H₂O₂=1:14,high purity CB[7]-?OH?₁ can be prepared under the conditions of 0.28 times Fe²⁺and 1 times HCl.