Organobentonites were prepared by modifying calcium bentonite using hexadecyltrimethyl-ammonium chloride(HTMAC) and silane coupling agent(KH550) as intercalation agents. The characteristics of swelling volume,colloid valence,and ethylene blue adsorbed were measured. Organobentonites were characterized with fourier transform infrared(FTIR),X-ray powder diffraction(XRD),scanning electron microscope(SEM) and brunauer-emmett-teller(BET). Results showed that the ability of dispersion and adsorption of organics increase with the increase of colloid valence and ethylene blue adsorbed. Under the
co-modification of HTMAC and KH550,the modified reagents has been intercalated to the layer of bentonite,and the
d001 values increase from 1.53nm to 2.89nm. The N
2 adsorption-desorption isotherm exhibited that organobentonite has type Ⅳ isotherm with a clear H3 hysteresis loop,which indicated that HTMAC/KH550/bentonite was a mixed microporous/mesoporous
material. Organobentonites were used to treat methyl orange wastewater. The effects of dosage,flocculation time,adsorption temperature and pH were investigated. Result showed that the highest removal rate of methyl orange wastewater was 89.8%. The optimum operationcondition were dosage of organobentonite 2g/L,flocculation time 30min,pH7-8 and adsorption temperature 20℃. Adsorption equilibrium studies showed that methyl orange adsorption follows the Langmuir model. In addition,the maximum adsorption capacity of the organobentonite was determined to be 71.53mg/g. HTMAC/KH550/bentonite is a kind of high adsorption capability adsorbent. It can provide a new method for dye removal.