Song Fei, Wang Peng, Chen Shangxing, Wang Zongde, Fan Guorong
College of Forestry, Jiangxi Agricultural University, Nanchang, P.R. China.
PLoS One. 2017 Jun 30;12(6):e0180178. doi: 10.1371/journal.pone.0180178. eCollection 2017.
By using dehydroabietyltrimethyl ammonium bromine (DTAB), a novel rosin-derived quaternary ammonium salt, as template and peroxotitanium acid as precursor, ordered lamellar supermicroporous titania has been synthesized via a hydrothermal process. The template agent:titanium source molar ratio in the synthesis system and the hydrothermal temperature have great impact on the microstructure characteristics of the samples. The increase of DTAB:TiO2 molar ratio from 0.04:1 to 0.10:1 is favorable to the increase of regularity of pore structures, but has no significant effects on the crystalline structures. The increase of the hydrothermal temperature from 343 to 393 K can induce an increase in crystallinity of the samples. However, the exorbitant hydrothermal temperature will reduce the regularity of pore structures. When the mole ratio of DTAB:TiO2 is 0.10:1 and the hydrothermal temperature is 373 K, the as-synthesized sample possesses pore structure with the highest level of long-range order, as well as pore wall with semicrystallized anatase phase. The pore size and the pore wall thickness are about 2.0 nm and 1.0 nm, respectively.
以新型松香衍生季铵盐脱氢枞基三甲基溴化铵（DTAB）为模板剂，过氧钛酸为前驱体，通过水热法合成了有序层状超微孔二氧化钛。合成体系中模板剂与钛源的摩尔比以及水热温度对样品的微观结构特征有很大影响。DTAB与TiO₂摩尔比从0.04:1增加到0.10:1有利于孔结构规整性的提高，但对晶体结构影响不显著。水热温度从343 K升高到393 K会导致样品结晶度增加。然而，过高的水热温度会降低孔结构的规整性。当DTAB与TiO₂的摩尔比为0.10:1且水热温度为373 K时，合成的样品具有长程有序程度最高的孔结构以及具有半结晶锐钛矿相的孔壁。孔径和孔壁厚度分别约为2.0 nm和1.0 nm。
