有机粘土基多孔颗粒材料的制备及其特性研究

PREPARATIONS AND CHARACTERISTICS OF ORGANOCLAY-BASED POROUS PARTICLE MATERIALS

研究了海藻酸钠(SA)与HDTMA改性的蒙脱土(HDTMAmodifiedmontmorillonite,HMM)的颗粒化制备及其与石油烃降解菌的复合,并研究了SA∶HMM不同质量比及不同SA浓度、不同CaCl2浓度下HMM颗粒的水稳性和吸油性、降解菌活性等性质。结果表明,在SA浓度为1%～2%,CaCl2浓度为2%～4%,SA∶HMM=1∶10时,获得的HMM颗粒粒径为2.5～4.0mm,对HMM表面结构影响不大,吸油率可达原始HMM的80%;将HMM颗粒与石油烃降解菌复合可形成稳定的生物膜,膜厚度为300μm左右,生物量为40～50mg·g-1。HMM颗粒复合生物膜为油污染地下水化学吸附生物降解提供了一种尝试。

HDTMA-modified montmorillonite （HMM） was immobilized by SA-CaCl2 to form granulated organoclay. Moreover, the granulated HMM was incubated with oil-depredated microorganisms and the stable biofilm was formed on the surface. The HMM composed with calcium alginate in solution at SA concentration of 1% -2%, at CaCl2 concentration of 2% 4%, and ratio of SA ： HMM at 1 ： 10. The granulated HMM could exist 30 d to 150 d steadily under 200 r/min vibration in water and its oil-adsorbed capability maintained 80% of original HMM. After finishing incubation oil-depredated microorganisms with granulated HMM, a stabile biofilm formed at 40-50 mg · g ^-1 of biomass and 300 μm of thickness, and also showed high enzyme activity.