The dispersibility of vermiculite is the key factor that affects the application of vermiculite.In this paper,the milled natural vermiculite was pillared by organic quaternary ammonium salts.Then the pillared vermicul...The dispersibility of vermiculite is the key factor that affects the application of vermiculite.In this paper,the milled natural vermiculite was pillared by organic quaternary ammonium salts.Then the pillared vermiculite was ground and homogenized under the existence of dispersive agent to form a stable vermiculite hydrosol system.Small angle X-ray diffraction(SA-XRD),fourier transform infrared spectroscopy(FTIR),and thermogravimetric analyses(TGA)were used to characterize the structure and thermal property of the vermiculite.The results indicate that the exfoliated vermiculite is successfully obtained.The analyses of laser particle size analyzer,transmission electron microscope(TEM),and Tyndall phenomenon analyzer demonstrate that the vermiculite hydrosol prepared is a stable hydrosol system.展开更多
文摘以4A沸石和天然蛭石为载体,钛酸四丁酯为钛源,采用溶胶-凝胶法制备了TiO2/4A沸石和TiO2/天然蛭石光催化复合材料,研究了复合材料对偶氮染料甲基橙的暗态吸附规律和光降解性能。结果表明:复合材料对甲基橙的吸附规律都较好地符合Langmu ir和Freund lich吸附等温模型;在紫外光辐照30 m in条件下,TiO2/4A沸石和TiO2/天然蛭石光催化材料对6.11×10-5mol/L的甲基橙水溶液的脱色率分别达到78.5%和84.6%,比同种方法制备的纯TiO2(68%)高,而且对甲基橙光催化反应可用一级反应动力学方程进行描述。
基金National High Technology Research and Development Program(863 Program),China(No.2007AA03Z336)Program for New Century Excellent Talents in University,China(No.NCET-07-0174)
文摘The dispersibility of vermiculite is the key factor that affects the application of vermiculite.In this paper,the milled natural vermiculite was pillared by organic quaternary ammonium salts.Then the pillared vermiculite was ground and homogenized under the existence of dispersive agent to form a stable vermiculite hydrosol system.Small angle X-ray diffraction(SA-XRD),fourier transform infrared spectroscopy(FTIR),and thermogravimetric analyses(TGA)were used to characterize the structure and thermal property of the vermiculite.The results indicate that the exfoliated vermiculite is successfully obtained.The analyses of laser particle size analyzer,transmission electron microscope(TEM),and Tyndall phenomenon analyzer demonstrate that the vermiculite hydrosol prepared is a stable hydrosol system.