Centro de Investigación y Desarrollo en Ciencias Aplicadas Dr. J.J. Ronco, CONICET-CIC-UNLP 47 No. 257, B1900 AJK, La Plata, Argentina.
J Colloid Interface Sci. 2013 Oct 15;408:21-4. doi: 10.1016/j.jcis.2013.06.055. Epub 2013 Jul 16.
A spent FCC catalyst was converted into a zeolitic mixture, and the product obtained was afterward used as trapping material for Cr(III) species frequently found in aqueous solutions. Eventual changes in the sorbent structure produced by Cr incorporation were studied by different characterization techniques such as point of zero charge determinations (PZC), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and infrared absorption (FTIR). The XRD and FTIR analyses indicated that chromium incorporation produces an amorphization of the material, and PZC measurements show no surface adsorption of charged chromium species. SEM and EDX analyses clearly show that after chromium sorption, the initial microspheroidal catalyst morphology was maintained, and the presence of chromium species was mainly detected in the outer microsphere surface, where the zeolite crystals were hydrothermally grown.
废 FCC 催化剂被转化为沸石混合物，所得产物随后被用作经常存在于水溶液中的 Cr(III)物种的捕获材料。通过不同的表征技术研究了 Cr 掺入对吸附剂结构的最终变化，例如零电荷点测定 (PZC)、X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、能量色散 X 射线分析 (EDX) 和红外吸收 (FTIR)。XRD 和 FTIR 分析表明，铬的掺入导致材料非晶化，而 PZC 测量表明没有带电荷的铬物种的表面吸附。SEM 和 EDX 分析清楚地表明，在铬吸附后，初始的微球形催化剂形态得以保持，铬物种主要存在于沸石晶体水热生长的外微球表面。
