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材料研究学报  2014, Vol. 28 Issue (12): 925-933    DOI: 10.11901/1005.3093.2014.185
  本期目录 | 过刊浏览 |
新型双子表面活性剂改性膨润土对苯酚的吸附特性
薛广海1,*,高芒来2,罗忠新2
1. 北京矿冶研究总院 北京 100160
2. 中国石油大学(北京)重质油国家重点实验室 理学院 北京 102249
Phenol Adsorption Characteristics of Two Novel Gemini Surfactants Modified Organ-bentonites
Guanghai XUE1,*,Manglai GAO2,Zhongxin LUO2
1. Beijing General Research Institute of Mining and Metallurgy, Beijing 100160
2. State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum, Beijing 102249
引用本文:

薛广海,高芒来,罗忠新. 新型双子表面活性剂改性膨润土对苯酚的吸附特性[J]. 材料研究学报, 2014, 28(12): 925-933.
Guanghai XUE, Manglai GAO, Zhongxin LUO. Phenol Adsorption Characteristics of Two Novel Gemini Surfactants Modified Organ-bentonites[J]. Chinese Journal of Materials Research, 2014, 28(12): 925-933.

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摘要: 

使用新型Gemini表面活性剂C12-3-C122Br(BDP)和C12-3(OH)-C122Cl(BDHP)制备了两种有机膨润土BDP-Bt和BDHP-Bt, 并通过FT-IR、XRD表征了其微观结构, 探究了两种有机膨润土对苯酚的吸附特性。结果表明: 随着pH值的增大, 两种有机膨润土对苯酚的吸附效果提高; 两者对苯酚的吸附符合拟二级动力学模型; 吸附曲线符合Langumir吸附; 有机膨润土BDHP-Bt对苯酚的吸附效果优于BDP-Bt, 从分子设计角度提出了一种制备有机膨润土新思路; BDP-Bt和BDHP-Bt对苯酚的吸附热和吉布斯自由能都为负值, 表明这两种有机膨润土对苯酚的吸附为自发的放热过程。
关键词 ： 无机非金属材料,  膨润土,  改性,  双子表面活性剂,  苯酚,  吸附    
Abstract：

Bentonite was modified by means of ion exchange with two Gemini surfactants (1, 3-bis(dodecyldimethylammonio)-propane dibromide (BDP) and 1, 3-bis(dodecyldimethylammonio)-2-hydroxypropane dichloride (BDHP)) respectively to prepare two organ- bentonites BDP-B and BDHP-Bt. The organ-bentonites were characterized by X-ray diffraction (XRD) and FT-IR spectroscopy. Then their adsorption ability of phenol from aqueous solutions was examined in terms of the pH value and contact time. The results show that the adsorption of phenol increases with of the increasing pH value. The adsorption kinetics was found to follow the pseudo-second-order kinetic model and the equilibrium data fitted the Langmuir and Temkin equations better than Freundlich equation for both BDP modified bentonite (BDP-Bt) and BDHP modified bentonite (BDHP-Bt). The results also show that BDHP-Bt containing one hydroxyl in the Gemini surfactant molecule was more effective than BDP-Bt for the sorption of phenol from aqueous solutions. Thus, a new idea was put forward for the selection of high efficient modified agent, i.e., hydroxyl-containing Gemini surfactants. The negative values of ΔG° and ΔH° obtained from thermodynamic study of adsorption process indicated the spontaneous and exothermic nature for the two organ- bentonites.
Key words： inorganic non-metallic materials    bentonite    modification    gemini surfactant    phenol    adsorption
收稿日期: 2014-04-12     
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https://www.cjmr.org/CN/10.11901/1005.3093.2014.185      或      https://www.cjmr.org/CN/Y2014/V28/I12/925

图1  原土、有机膨润土BDP-Bt和BDHP-Bt的红外谱图
图2  原土、有机膨润土BDP-Bt和BDHP-Bt的XRD谱图
图3  改性剂用量对苯酚吸附效果的影响
图4  反应时间和溶液pH对苯酚吸附效果的影响
Parameter Pseudo-second-order Pseudo-second-order Intraparticle diffusion
pH qe,exp k1 qe,cal R2 k2 qe,cal h R2 Kdif C R2
BDP-Bt
2 5.34 0.0126 1.55 0.4068 0.192 5.35 5.50 0.9997 0.270 3.86 0.9554
4 20.48 0.0269 6.78 0.7631 0.020 20.41 8.24 0.9993 0.891 13.86 0.9590
6 35.53 0.0288 7.68 0.7151 0.023 35.34 28.90 0.9999 1.169 27.60 0.9450
10 39.53 0.0283 7.25 0.6821 0.026 39.37 40.98 0.9999 1.028 32.46 0.9530
BDHP-Bt
2 5.80 0.0329 2.82 0.7022 0.031 8.91 1.11 0.9944 0.576 2.01 0.9984
4 20.89 0.0329 13.91 0.9379 0.006 21.79 2.74 0.9930 3.071 5.40 0.9981
6 39.38 0.0350 23.18 0.9525 0.004 40.65 6.86 0.9968 5.034 6.97 0.9740
10 43.77 0.0359 18.69 0.8909 0.007 44.64 13.07 0.9989 4.427 16.70 0.9788
  
Isotherms Parameters
BDP-Bt BDHP-Bt
Langmuir Qm=52.91 mg/g Qm=58.82 mg/g
Ka=0.067 L/mg Ka=0.078 L/mg
R2=0.9995 R2=0.9992
Freundlich 1/n=0.3171 1/n=0.3155
KF=10.03 mg/g KF=11.64 mg/g
R2=0.8738 R2=0.8321
Temkin α=1.2732 L/g α=1.5812 L/g
β=9.089 mg/L β=9.9905 mg/L
b=272.61 J/mol b=250.14 J/mol
R2=0.9673 R2=0.9536
表2  有机膨润土对苯酚的吸附等温线参数
图5  有机膨润土对苯酚吸附的拟二级动力学模型曲线
T/K BDP/BDHP-Bt
ΔG °/kJmol-1 ΔH°/kJmol-1 ΔS°/J(molK)-1
298 -23.81/-23.43 -5.50/-4.62 61.41/63.12
308 -24.42/-24.07
318 -25.02/-24.70
328 -25.65/-25.32
表3  有机膨润土对苯酚的吸附热力学参数
图6  有机膨润土对苯酚的吸附平衡曲线
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