Synthesis of nano anatase for titanosilicate ETS-10 synthesis .

摘要

Functionalized textiles present a vast and growing niche in the global textile market at US ;ETS-10 synthesis was investigated using two methods adopted from literature [6, 7]. The method of Yoon and co-workers [7], with nano anatase in a molar composition of 5.5TEOS: TiO2: 8.4NaOH: 1.43KF: 350H2O: 2.2H2SO4 produced unknown phase(s) with some ETS-10 and quartz. Using colloidal anatase with molar composition 5.5TEOS:1.0TiO 2:8.4NaOH:1.43KF:400H2O:2.2H2SO4 also produced unknown phase(s). The method of Anderson and co-workers [6] with nano anatase powder in a molar composition of 5.5SiO2: TiO 2: 5.2Na2O: 0.5K2O: 113H2O produced quartz with ETS-10 impurity. When colloidal anatase was used, with molar composition TiO2:5.5SiO2:5.2Na2O:0.5K2O:332H 2O, unreacted anatase and quartz were formed. It was hypothesized that the very low reaction mixture pH of ∼4.1 was responsible for the absence of ETS-10. Therefore, pH of this mixture was modified between ∼6.55-12.75.At low pH of ∼6.55 unreacted anatase was present, while, pH higher than ∼11.24 formed ETS-4 crystals. At an "optimum" pH of ∼11.24 nearly phase-pure ETS-10 crystals were formed. However, these ETS-10 crystals were not small but ∼10-20 mum. This is the first time, that colloidal anatase has been utilized for ETS-10 synthesis.