Study on Channel Features and Mechanism of Clinoptilolite Modified by LaCl_3

摘要

Natural clinoptilolite was modified by LaCl_3 at different ion concentrations, particularly focusing on the effects of LaCl_3 on surface area, average pore width and pore volume distribution. And the structure was characterized by analyzing the X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and Energy Dispersive Spectroscopy (EDS). The results showed that the surface area, total pore volume and micropore area decreased after modified by LaCl_3, while the average pore width increased, among which the micropore area most significantly changed. The result of IR indicated that LaCl_3 did not enter into silico-oxygen tetrahedron skeleton to participate in skeleton vibration. The result of XRD showed that the crystallinity of the modified clinoptilolite was slightly reduced, and the diffraction peak deviated to small angle, but the crystal structure kept invariant. The result of EDS, FT-IR and XRD demonstrated that LaCl_3 can be loaded on the surface and channels of clinoptilolite, which led to degradation in absorption performance of clinoptilolite to ammonia nitrogen while for phosphorus increases.