球形TiSAPO-34分子筛的合成、表征及其对亚甲基蓝的吸附性能
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摘要
利用水热法合成了Ti SAPO-34分子筛,通过扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、N2吸附-脱附、紫外-可见漫反射吸收光谱(UV-Vis DRS)、热重(TG)等方法对其形貌、物相组成、孔径等进行表征。以亚甲基蓝的水溶液模拟污染物评价Ti SAPO-34分子筛吸附性能,考察了钛的掺杂量及样品再生后对亚甲基蓝吸附性能的影响。结果表明:样品形貌为球形,是一种微孔分子筛,具有较好的热稳定性。样品中部分Ti原子成功进入骨架,仍保持了SAPO-34分子筛的骨架结构。在190℃晶化24 h得到的样品吸附性能较好,0.3 g样品吸附1 h对0.01 g·L~(-1)亚甲基蓝的水溶液模拟污染物吸附率达到80%。
The TiSAPO-34 molecular sieves have been successfully synthesized via a facile hydrothermal method.Scanning electron microscopy(SEM), powder X-ray diffraction(XRD), Fourier transform infrared(FT-IR), N2 adsorption-desorption, UV-Vis diffuse reflectance spectra(UV-Vis DRS) and thermogravimetric(TG) have been employed to determine the properties of the samples. The TiSAPO-34 molecular sieves could be served as efficient adsorbents for adsorbing a typical contaminants, methylene blue(MB) from water. Moreover, the doped amount of titanium, the stability and recyclability of the catalysts have been investigated in detail. The results revealed that the resulting samples were the spherical microporous molecular sieve, which with good thermal stability. Interestingly, a certain amount of Ti atoms could embed the matrix of SAPO-34 molecular sieves successfully, and the skeleton structure of SAPO-34 molecular sieves still maintained. Importantly, the samples synthetic after crystallization at 190 ℃ for 24 h exhibited the optimal adsorption performance for the adsorption of MB, giving an adsorption rate of 80% after 1 hour.
The TiSAPO-34 molecular sieves have been successfully synthesized via a facile hydrothermal method.Scanning electron microscopy(SEM), powder X-ray diffraction(XRD), Fourier transform infrared(FT-IR), N2 adsorption-desorption, UV-Vis diffuse reflectance spectra(UV-Vis DRS) and thermogravimetric(TG) have been employed to determine the properties of the samples. The TiSAPO-34 molecular sieves could be served as efficient adsorbents for adsorbing a typical contaminants, methylene blue(MB) from water. Moreover, the doped amount of titanium, the stability and recyclability of the catalysts have been investigated in detail. The results revealed that the resulting samples were the spherical microporous molecular sieve, which with good thermal stability. Interestingly, a certain amount of Ti atoms could embed the matrix of SAPO-34 molecular sieves successfully, and the skeleton structure of SAPO-34 molecular sieves still maintained. Importantly, the samples synthetic after crystallization at 190 ℃ for 24 h exhibited the optimal adsorption performance for the adsorption of MB, giving an adsorption rate of 80% after 1 hour.
引文
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