复合有机膨润土的制备及其对苯酚吸附性能的研究  

Preparation of Organic Bentonite Composite and Its Adsorption Property for Phenol

作　　者：李静[1] 谢鲜梅[1] 段炼[1] 吴旭[1] 高晋云[1] 

机构地区：[1]太原理工大学化学化工学院,山西太原030024

出　　处：《非金属矿》2013年第2期79-83,共5页Non-Metallic Mines

基　　金：太原市科学技术项目(120238);山西省青年科技研究基金(2012021006-3);太原理工大学2012年校青年基金(2012L022)

摘　　要：以钙基膨润土为原料,在一定条件下合成了十六烷基三甲基溴化铵(CTMAB)和聚二甲基硅氧烷(PDMS)共同改性的复合有机膨润土(C-P-Bent),借助XRD、FTIR等手段对其物化性能进行表征,并将其应用于苯酚的吸附研究。结果表明,单一PDMS无法进入到膨润土层间,但一定量PDMS可插层到CTMAB改性土(C-Bent)层内,在层间与CTMAB及层板以范德华力相结合。当苯酚初始质量浓度为300mg/L,CTMAB用量分别为0.5、0.6倍膨润土阳离子交换容量(CEC),PDMS用量均为0.2mL时,C-P-Bent与C-Bent相比,对苯酚去除率分别从55.64%、63.22%提高到64.35%、74.55%。热力学研究表明,改性土对苯酚的吸附过程符合Freundlich和Langmuir方程,ΔG绝对值数值约为3kJ/mol,苯酚吸附主要由层间有机相的分配作用产生。Organic bentonite composites（C-P-Bent） were prepared by cetyltrimethylammonium bromide（CTMAB） and polydimethysiloxane （PDMS） using Ca-montmorillonite as raw materials under a certain condition. The composites were characterized by X-ray diffraction （XRD）, fourier transform infrared （FTIR） and used in the adsorption of phenol. The results showed that PDMS alone could not enter the layer of bentonite, but a certain amount of PDMS can be successfully intercalated to CTMAB modified bentonite layer（C-Bent）, PDMS are combined with CTMAB and layer board through Vander Waals force in the layer. In the same condition and initial concentration of phenol is 300 rag/L, the amount of CTMAB is 0.5 times and 0.6 times cation exchange capacity of bentonite, compared with C-Bent, the removal rate of phenol by C-P-Bent increased from 55.64% and 63.22% to 64.35% and 74.55%. Thermodynamics research showed that the adsorption process of phenol to modified bentonite was in accord with both Freundlich and Langmuir equations, the Gibbs free energy was about 3 kJ/mol which indicated that the adsorption of phenol was mainly the result of organic phase distribution in layer.

关 键 词：膨润土 十六烷基三甲基溴化铵 聚二甲基硅氧烷 苯酚 吸附 

分 类 号：O614.121[理学—无机化学] X703[理学—化学]