科研之友
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摘要
A facile approach was developed to prepare boron nitride nanosheets (BNNSs) by directly exfoliating hexagonal boron nitride (h-BN) intercalated with concentrated H2SO4, subsequently the rapid heating effect of H2SO4 mixing with water. The obtained BNNSs were characterized. It was demonstrated that bulk h-BN powder was successfully exfoliated by this new method. Transmission electron microscopy and atomic force microscopy confirmed that the obtained BNNSs mainly consisted of few-layer sheets with a thickness range 1-2 nm, corresponding to 3-6 layers. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy revealed that the oxidation did not occur in BNNSs during the concentrated H2SO4-intercalated exfoliation process. It was directly observed that the resultant BNNSs could be well dispersed in water. The adsorption performance of the BNNSs for Rhodamine B were then studied. Compared with the bulk BN, BNNSs showed superiority in adsorption ability. And the adsorption capacity of BNNSs was about 2 times that of h-BN.
