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Materials 2017, 10(7), 705; https://doi.org/10.3390/ma10070705

Reuse of Pillaring Agent in Sequential Bentonite Pillaring Processes

Laboratory of Molecular Sieves—LABPEMOL, Institute of Chemistry, Federal University of Rio Grande do Norte—UFRN. Av. Senador Salgado Filho, 3000, Lagoa Nova, University Campus, 59072-970 Natal-RN, Brazil
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Academic Editor: Antonio Gil
Received: 27 April 2017 / Revised: 29 May 2017 / Accepted: 30 May 2017 / Published: 27 June 2017
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Abstract

This work describes the synthesis and characterization of pillared clays using a new pillaring method: the reuse of the pillaring solution. First, an Al pillared clay (PILC) was synthesized, and after filtration, the pillaring agent was stored and reused for an additional three pillaring procedures (P1, P2, and P3). The filtered pillaring solution was stored for one year and then reused for one additional pillaring procedure (P4). The samples were analyzed using XRD, N2 physisorption measurements and chemical analysis (EDX). All of the samples exhibited basal spacings larger than 17 Å and BET surface areas greater than 160 m2/g. After the P4 pillaring, the pillaring agent was precipitated with a Na2SO4 solution, and the resulting solid was analyzed using XRD and SEM. The results indicated that even after a total of five pillaring procedures, Al13 ions were still present in solution. Therefore, it is possible to reuse the pillaring solution four times and to even store the solution for one year, which is important from an industrial perspective. View Full-Text
Keywords: pillaring solution; Keggin ion; reutilization pillaring solution; Keggin ion; reutilization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Bertella, F.; Pergher, S.B.C. Reuse of Pillaring Agent in Sequential Bentonite Pillaring Processes. Materials 2017, 10, 705.

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