PDF(Pubmed)
Abstract：
Fly ash was used as raw material to prepare zeolites through silicate gels, assisted by the hydrothermal method. The silicate gels could be effectively formed in a few minutes in a molten alkali environment. The zeolites could be prepared by using these silicate gels through the hydrothermal method, which realizes the transformation from useless materials to highly valuable materials. The obtained zeolites were applied to the removal of ammonium in water, achieving the highvalue utilization of fly ash. The synthesized zeolites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrum (EDS), thermogravimetric (TG), and Fourier transform infrared (FTIR) spectroscopy. The study on the adsorption and removal of ammonium in water shows that the adsorption of ammonium is more in line with pseudo first-order kinetics, and the adsorption mainly occurs in the first 20 min. The adsorption can reach equilibrium in 30 min, and the maximum adsorption capacity can reach 49.1 mg/g. The adsorption capacity of ammonium has the best performance at pH = 5. Furthermore, within a certain range, an increase in temperature is beneficial for the removal of ammonium.
摘要：
以粉煤灰为原料，通过硅酸盐凝胶制备沸石，在水热法的辅助下。硅酸盐凝胶可以在熔融碱环境中在几分钟内有效地形成。沸石可以通过水热法使用这些硅酸盐凝胶来制备，实现了从无用材料到高价值材料的转变。将获得的沸石用于去除水中的铵，实现了粉煤灰的高值化利用。用X射线衍射(XRD)对合成的沸石进行了表征,扫描电子显微镜（SEM），能量色散谱(EDS)，热重（TG），和傅里叶变换红外(FTIR)光谱。对水中铵的吸附和去除研究表明，铵的吸附更符合拟一级动力学，吸附主要发生在前20min。吸附可在30min内达到平衡,最大吸附量可达49.1mg/g。在pH=5时，铵的吸附容量最好。此外，在一定范围内,温度的升高有利于铵的去除。
