Synthesis Of Dehydroabietic Based Amphoteric Surfactant And Its Application As Template Of Porous Titanium Dioxide Preparation

Tiannium dioxide porous materials have the broad application prospects in some areas such as catalytic, adsorption, separation, biological materials, energy and environment, and so on. The templates with the pore size adjustment function have aroused the wide concern for the synthesis of porous materials. Especially there is more study about the preparation of porous materials using the surfactants as templates. Dehydroabietic acid is cheap, renewable, and natural chemical raw materials and the annual output of dehydroabietic acid is hundreds of thousands of tons. However, there is little study for the preparation of porous materials using the dehydroabietic acid as templates.Firstly, N-(3-dehydroabietyloxy-2-hydroxy) propyl-N, N-dimethyl (2-hydroxy) phospsate betain was synthesized through the 3-dehydroabietyloxy-2-hydroxypropyl chloride and tertiary amine intermediate by using dehydroabietic acid as raw materials. The structure of the target product was confirmed by identification of gender-ion experiments, FT-IR,1H NMR and determination of nitrogen. The surface-active property was investigated by surface tension experiment and measurement of foaming power, foam stability and emulsifying power. The surface activity of the mixed system of the product and sodium dodecyl sulphate (SDS) was determined. The results showed that the nitrogen content was 2.52%. Critical micelle concentration (CMC) of the product is 0.806 mmol·L-1, and the foaming ability is 280 mm, with a strong emulsification ability. Strong synergism in product is observed combining with SDS, and the optimum synergism is obtained at the molar ratio of 1∶1. The products have typical betaine structure with properties of amphoteric compounds.Secondly, tiannium dioxide porous material that has typical mesoporous structure was prepared by the way of acid catalytic hydrolysis and using the TiCl4 as the titanium source and dehydroabietic-based phosphate betaine type amphoteric surfactants as the template. The pore size of the synthesized tiannium dioxide porous material that is 11.46 nm has the IV type adsorption isotherm. The XRD results show that the anatase crystal size of the sample by calculated is 11.6 nm. The FT-IR spectras of the sample indicates that the template in the samples is completely removed by calcinations at 500℃and TiO2 is produced. The photocatalytic activity of samples is tested by using the phenol solution as model reactants. The results show that the degradation rate of samples for the phenol is 73.06% after 220 min, when the usage amount of the template are 1 g and the sample was calcined at 200℃for 2 h and 500℃for 4 h. The adsorption performance of tiannium dioxide is increased by porous structure.Lastly, Porous titanium dioxide was prepared by using the trimethyl-dehydroabietic quaternary ammonium salt as a template via acid hydrolysis of titanium tetrachloride. The synthesized porous TiO2 were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, Fourier transform infrared spectra (FT-IR), thermogravimetric analysis and N2 adsorption-desorption techniques, respectively. The crystal structure, structure, thermal stability, pore size distribution and specific surface area are analysed. The photocatalytic property of the synthesized porous TiO2 was tested by using phenol decomposition as a model reaction. The experimental results showed that the synthesized tiannium dioxide porous material has typical mesoporous structure. The pore size of the synthesized tiannium dioxide porous material is 12.38 nm and it has theⅣtype adsorption isotherm. The XRD results show that the sample calcined at 200℃for 2 h and 500℃for 4 h has anatase phase structure and the anatase crystal size is 12.6 nm. The N2 adsorption-desorption results show that the specific surface area of the porous TiO2 was 93.18 m2/g. The FT-IR spectras of the sample indicates that the template in the samples is completely removed by calcinations at 500℃and the tiannium dioxide porous material is produced. The photocatalytic activity of samples is tested by using the phenol solution as model reactants. The results show that the degradation rate of samples for the phenol is 74.21% after 220 min, when the usage amount of the template are 1 g and the sample was calcined at 200℃for 2 h and 500℃for 4 h. The adsorption performance of tiannium dioxide is increased by Porous structure.