Electrical double-layer effects on the deposition of zeolite A on surfaces.
Zeolite particles formed from an aluminosilicate solution possess a negative surface charge due to the substitution of aluminum atoms into a SiO4 tetrahedral structure making it difficult to form a continuous layer in solution. The particle interactions with surfaces and each other can be studied using the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The interaction energy between zeolite-zeolite and zeolite-substrate on various materials can be estimated in this fashion. The zeolite LTA particles show a stronger repulsion interaction on all substrates and on the each other as compared to the ZSM-5 particles. This repulsive energy also increases as the particles size increases. This results in the formation of conglomerate in the solution rather than forming an adhered layer on the substrate.
Oonkhanond
Bovornlak
B
Chemical Engineering Department, Mahidol University, 25/25 Buddhamonthon 4 Rd., Nakornprathom 73170, Thailand.
Mullins
Michael E
ME