In this research surface modified zeolites, Linde Type A and clinoptilolite, were used for the chromate ions uptake from aqueous solutions as well as its encapsulation through a vitrification process. The surface chemistry of zeolites was modified using a cationic surfactant hexadecyltrimethylammonium (HDTMA) to promote the capability of anions uptake. The results of characterization by X-ray diffraction showed unique crystalline phases for each zeolite which remain unchanged after the incorporation of the surfactant. Evidence from Fourier-transform infrared spectroscopy studies revealed the effective bond of the HDTMA on the clinoptilolite surface. Results suggested that the presence of CH₂⁻ groups after the modification play a key role for the anion attraction. Kinetic studies revealed that surfactant-modified clinoptilolite was able to adsorb 9.83 mg/g of chromate and better fitted pseudo-second order model (R² = 0.957). The equilibrium was better represented by Freundlich model (R² = 0.993). Finally, the proposed vitrification process the spent zeolitic adsorbent was successful, avoiding leaching of chromate ions after two months at different pH values.

在这项研究中，表面改性的沸石（A型Linde和斜发沸石）用于从水溶液中吸收铬酸根离子以及通过玻璃化过程对其进行封装。使用阳离子表面活性剂十六烷基三甲基铵（HDTMA）改性沸石的表面化学，以提高阴离子的吸收能力。通过X-射线衍射表征的结果显示出每种沸石的独特晶相，这些晶相在掺入表面活性剂后保持不变。傅里叶变换红外光谱研究的证据表明，HDTMA在斜发沸石表面上有效结合。结果表明，CH的存在₂ ^-修饰后的基团对阴离子吸引力起关键作用。动力学研究表明，表面活性剂修饰的斜发沸石能够吸附9.83 mg / g铬酸盐，并且拟合效果更好，拟二级模型（R ² = 0.957）。Freundlich模型更好地表示了平衡（R ² = 0.993）。最后，建议的玻璃化废沸石吸附剂的玻璃化工艺是成功的，避免了在不同pH值下两个月后铬酸盐离子的浸出。