摘要
用十六烷基三甲基铵(CTMA)阳离子对钠基膨润土通过离子交换进行插层改性,采用X射线衍射(XRD)和红外光谱(IR)对CTMA改性膨润土结构表征,在100%的离子交换下,其d001比钠基膨润土增大7.54,红外光谱显示CTMA改性膨润土的-OH伸缩与弯曲二振动强度明显低于钠基膨润土。用甲基橙水溶液为染料废水模型物,考察了CTMA改性膨润土对甲基橙的吸附特性,对吸附实验数据运用相关数学模型拟合,得出该等温吸附平衡符合Langmuir与Freundlich二吸附模型,整个吸附过程更适合准二级动力学;通过计算不同温度各热力学参数ΔG0、ΔH0和ΔS0,证实该吸附过程为一自发的放热物理吸附。
The paper prepares the intercalated CTMA-bentonite by Na-bentonite cation exchanged with cetyltrimethylammonium and characterizes the product by XRD and IR techniques. The d_ 001 spacing value of CTMA-bentonite is 7.54 larger than that of Na-bentonite at 100% of the cation exchange capacity. The IR spectrum shows that the intensities of OH stretching and bending vibrations of CTMA-bentonite decrease greatly compared with the untreated Na-bentonite. Batch experiments are carried out at 303 K, 323 K and 343 K to obtain the sorption isotherms of methyl orange on CTMA-bentonite. The results show that the sorption isothermal data can be well described by Langmuir and Freundlich model accurately. The dynamical data fit well with pseudo-second-order kinetic model. Thermodynamic parameters such as changes in the free energy （ΔG0）, the enthalpy （ΔH0） and the entropy （ΔS0） are also evaluated. The overall adsorption process of methyl orange on CTMA-bentonite is spontaneous, exothermic physisorption. The CTMA-bentonite can be employed as low-cost alternatives to activated carbon in wastewater treatment for the removal of corlor which comes from textile dyes.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第5期120-125,共6页
Journal of Chongqing University
基金
重庆市教委资助项目(KJ090707)
关键词
膨润土
CTMA
表征
吸附
甲基橙
bentonite
CTMA
characterization
adsorption
methyl orange
作者简介
任建敏（1964-，男，重庆工商大学教授，硕士生导师，主要从事功能材料与环境工程方向的研究，（Tel）13936107945；（E—mail）renjianmin123@shou．com。
