Abstract:A new method that can increase the exposure of siloxane surface was developed in this work. First the inorganic cations on bentonite were exchanged with Li+, and then a part of the Li+ were further exchanged with tetramethylammonium cation (TMA), i.e., 20% or 60% of the bentonite's cation exchange capacity. After that the samples were heated under 180℃ for 10h to make sure that most of the Li+ were transferred to bentonite sheets. By this way, the layer charge of bentonites can be effectively reduced while the layers of bentonite can be preserved by pre-exchanged TMA. The resulting organic bentonite showed larger specific surface areas and better adsorption capacity than those synthesized using traditional method (i.e., first reducing the charge density and then exchanging TMA). For example, in the case of organic bentonite with 20% CEC TMA, the one synthesized using new method has almost twice the specific surface areas as the one synthesized using traditional method (236 vs 131m2/g), and the adsorption capacity of nitrobenzene also significantly increased.