Abstract
In this study, the natural pure rectorite (REC) with regular interlayer structure and cation-exchange character was successfully modified by cationic surfactant cetyl trimethyl ammonium bromide (CTAB), the obtained the organic-modified rectorite (M-RCE) was used to remove anionic dye acid orange (AO) from water. The results showed that CTAB was intercalated into the interlayer of pure REC, and the interlayer distance of M-REC was enlarged from 2.57 nm to 2.93 nm. Zeta potential analysis showed that the surface charge of M-RCE was changed from negative to positive after modification. The uptake of AO increased along with increased the dosage of M-REC, while solution pH was not affected the removal efficiency of AO. The adsorption isotherm was well-described by Langmuir model, the calculated AO adsorption capacity was 98.59 mg/g, and the adsorption kinetic data fitted a pseudo-second order model. The adsorption mechanism analysis confirmed that electrostatic attraction between the positively charged M-REC surface and the negatively charged AO played a key role in the high uptake of AO from water.
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