Synthesis Of Triazine Zirconium Carboxylate Mesoporous Materials And Its Study The Adsorption Performance Of Organic Molecules

With the development of agriculture and industry, water pollution has become more and more serious. Rhodamine B (RhB) is one of the most important water-soluble synthetic dye, which has been widely used as food additives, but now it can only be used for dyeing industry, since it has been identified as carcinogenicity.2-Secbutyl-4,6-dinitrophenol (DNBP) is a typical example of nitro-substituted phenols, it is widely used as an insecticide in agriculture and an high temperature inhibitor in the petrochemical industry, it also has the very strong biological toxicity. A mass of highly toxic and poor biodegradability organic wastewater are produced in the process of above two kinds of compound production and use. The waste water has serious harm to public health and hindered futher development of social. Therefore, find effective method to remove organic pollutants from wastewater become the focus of attention. At present a lot of methods about removing pollutants from wastewater was reported, but only adsorption method has universal applicability, no secondary pollution, low energy consumption and high utilization rate of repeat. Mesoporous material has been widely used as a carrier, adsorption and storage, due to its unique physical properties, such as large surface area, the highly uniform channel and easy to modify the hole wall.In the paper, by using cyanuric chloride, toluene, zirconium tetrachloride, SDS and other raw materials synthesis of triazine zirconium carboxylate mesoporous materials has rich pore structure and large surface area. This synthesis methods provides the reference for new carboxylate mesoporous material preparation. The adsorption behavior of Rhodamine B and DNBP in aqueous solution on triazine zirconium carboxylate mesoporous materials has been investigated by static adsorption technique. This research provides the potential application of triazine zirconium carboxylate mesoporous materials as an adsorbent for the treatment of organic wastewater. The research in this paper includes the fellowing three parts.(1) Firstly,2,4,6-Tri-p-tolyl-1,3,5-triazine(TPTA) intermediates was obtained by using cyanuric chloride, toluene and alumina friedel-crafts reaction. Then 2,4,6-tris (4-carboxyphenyl)-1,3,5-triazine (H3TATB) ligand was synthesized by chemical oxidation method. Molecular structure was identified with H NMS, HRMS and FT-IR. Triazine zirconium carboxylate mesoporous materials(ZrTATB) were synthesized by one-pot hydrothermal reaction of H3TATB organic ligands and zirconium tetrachloride with SDS as the template agent. The structure and morphology of the synthesized materials were characterized by SEM, TEM, N2 sorption, and FT-IR. At the same time the material physical properties were determined by TG and Zeta potentiometer.(2) The effects of various factors, such as the dosage of the adsorbent, adsorption temperature, initial concentration of Rhodamine B and DNBP, adsorption time and pH value on the adsorption capability of triazine zirconium carboxylate mesoporous materia1s(ZrTATB) have been studied throughly, then obtained the best adsorption conditions. The test results show that the ZrTATB mesoporous material has pH sensitivity, the best adsorption effect of Rhodamine B at isoelectric point and low pH adsorption DNBP best. The material no adsorption capacity of DNBP after solution become weakly alkaline, but can take advantage of this feature regeneration of mesoporous materials. Combination with the Zeta potential of mesoporous materials and the influence of pH on the adsorption process, It can be speculated that Van der Waals forces, electrostatic effect and the function of the π-π between aromatic ring maybe exist in the adsorption of Rhodamine B and DNBP on ZrTATB mesoporous material.(3) The thermodynamics and kinetics in the process of adsorption of Rhodamine B and DNBP on triazine zirconium carboxylate mesoporous materials(ZrTATB) was study. The results show that the adsorption isotherms of ZrTATB mesoporous materials adsorption of Rhodamine B and DNBP can be fitted by both Langmuir and Freundlich models. The Freundlich data indicate the favorable case of the adsorption of Rhodamine B on ZrTATB mesoporous materials. The pseudo-second-order kinetic model can describe the adsorption of Rhodamine B and DNBP on ZrTATB mesoporous materials very well and the process of adsorption of Rhodamine B and DNBP on ZrTATB mesoporous materials are controlled by membrane diffusion and internal diffusion. The adsorption of Rhodamine B and DNBP on ZrTATB mesoporous materials are endothermic process accompanying the increase of disorder of the system and can be occurred spontaneously.