SDS对焙烧沸石物化性质和除氨氮效果的影响

为了研究十二烷基硫酸钠(SDS)修饰对焙烧沸石物化性质和去除二级出水中氨氮效果的影响,对天然沸石进行了SDS修饰、焙烧改造处理.实验结果表明,SDS修饰可以大大提高焙烧沸石的脱氮效果.在SDS最佳修饰焙烧条件下,氨氮去除率可达98.79%,与不修饰相比,氨氮去除率提高近30%.通过对改性后沸石扫描电镜(SEM)和能谱图分析(EDS),X射线衍射分析(XRD)、比表面积与孔径分析、红外光谱图分析(IR)、离子交换容量(CEC)等表征手段分析发现,SDS的修饰使得焙烧沸石表面更加松散,出现了更多的孔道,沸石孔容积和孔径也有增加,Na离子含量增加,硅铝比减少,主衍射峰强度减弱,沸石内部化学基团发生变化,离子交换容量增加.

Effect of Modification by SDS on Roasting-assisted Clinoptilolite of Physicochemical Properties and Ammonia-nitrogen Removal Performance

To investigate the effect of modification by SDS on the roasting-assisted clinoptilolite of physic-chemical properties and ammonia nitrogen removal performance from secondary effluent, natural clinoptilolite was modified by SDS-firing. The results have shown that SDS decoration can greatly improve the denitrification performance of roasted zeolite. SDS modified roasted zeolite has a better removal rate of nearly 98.79%, an increase of about 30% over the roasted samples. By scanning electron microscopy (SEM) and energy spectrum analysis (EDS), X-ray diffraction (XRD), specific surface area and pore size analysis, infrared spectra analysis (IR), and cation exchange capacity (CEC), the characterizations of the zeolite before and after being modified were analyzed. SDS modification made the surface of the zeolite particles loosen, there were more channels, and pore volume and pore diameter were increased. The silica alumina ratio of zeolite decreased, the Na ion content of the composite zeolite increased, the diffraction peak intensity weakened, and the internal chemical groups changed, further enhancing the cation exchange capacity.