The X-ray diffraction patterns of raw bentonite and CTMAB-Bent were shown inFig. 1, exhibiting bentonite typical diffraction peak at 2θof about 5°. The 2θvalues of raw bentonite and CTMAB-Bent were 6.04 and 4.66, respectively. The peak shifts from the right side to the left side, indicating the expansion ofd001spacing and the completeness of crystal structure. The calculatedd001distance of 15.4 Å conformed to
the main compensating cations of calcium and magnesium. After being CTMAB modified, thed001value increased to 18.97 Å, suggesting that the surfactant CTMA+ ions entered into the interlayer space of the bentonite by ion exchange.