交换液酸碱度对OTAC在蒙脱石中吸附及复合物凝胶粘度影响
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摘要
在蒙脱石有机改性体系中,交换液酸碱度对蒙脱石荷电性以及十八烷基三甲基氯化铵(OTAC)的电离度影响很大,进而影响OTAC在蒙脱石中的吸附以及制备复合物的凝胶粘度。研究发现,在pH=3的强酸性交换体系中,蒙脱石端面可变电荷为正电荷,OTAC阳离子和蒙脱石之间静电斥力的存在不利于OTAC在蒙脱石上的吸附,吸附量和吸附率分别是0.943 CEC和85.7%,制备复合物的凝胶粘度最低,分别是μ_(0min)为45.67 Pa·s,μ_(30min)为16.52 Pa·s;在pH=10的弱碱性交换体系中,由于蒙脱石层面和端面均带有负电荷,静电引力更有利于OTAC阳离子在蒙脱石层间交换及表面吸附,其吸附量和吸附率最高,分别为1.097 CEC和99.71%,制备复合物的凝胶粘度也较高,分别是μ_(0min)为95.93 Pa·s,μ_(30min)为37.67 Pa·s;在强碱性交换体系中,当pH=11和13时,蒙脱石对OTAC的吸附量和吸附率降低明显,吸附量分别为1.08 CEC和1.058 CEC,吸附率分别降到98.20%和96.18%,对应复合物的μ_(0min)分别为96.52 Pa·s和93.52 Pa·s,μ_(30min)分别为36.57 Pa·s和36.53 Pa·s,究其原因由于交换液中OTAC阳离子和高浓度的钠离子在蒙脱石层间和表面存在竞争吸附导致蒙脱石层间钠离子的交换难度加大。
In the organic modification system of montmorillonite,the acidity of the exchange solution has a great influence on the charge of montmorillonite and the ionization of octadecyl trimethylammonium chloride,which further affects the adsorption of octadecyl trimethylammonium chloride in montmorillonite and the gel viscosity of the prepared complex.The results indicate the variable charge on the end face of montmorillonite is positive charge in the strongly acidic exchange system with a pH of 3,which is not conducive to the adsorption of OTAC on montmorillonite because of the electrostatic repulsion,the adsorption capacity and adsorption efficiency in montmorillonite are 0.943 CEC and 85.7% respectively,the gel viscosity of the prepared complex are μ_(0 min) 45.67 Pa·s and μ_(30 min )16.52 Pa·s respectively.In the weakly basic exchange system with a pH=10,because of the layers and faces of montmorillonite are both negatively charged,electrostatic attraction is more advantageous to the exchange of organic cation on montmorillonite interlayer and surface adsorption,the adsorption capacity and adsorption efficiency are 1.097 CEC and 99.71% respectively,the gel viscosity of the prepared composite are μ_(0 min) 95.93 Pa·s and μ_(30 min) 37.67 Pa·s respectively;In the strong alkaline exchange system with pH value11 and 13,due to the competitive adsorption of organic cations and sodium ions in layers and surfaces of montmorillonite,and coupled with the difficulty of the exchange of sodium ions in interlayer is increased,the adsorption capacity and adsorption efficiency of OTAC are decreased obviously,the adsorption capacity 1.08 CEC and 1.058 CEC respectively,the adsorption efficiency are 98.20% and 96.18% respectively.the gel viscosity μ_(0 min )and_(μ30 min )of the prepared complex are 96.52 Pa·s,93.52 Pa·s and 36.57 Pa·s,36.53 Pa·s respectively.
In the organic modification system of montmorillonite,the acidity of the exchange solution has a great influence on the charge of montmorillonite and the ionization of octadecyl trimethylammonium chloride,which further affects the adsorption of octadecyl trimethylammonium chloride in montmorillonite and the gel viscosity of the prepared complex.The results indicate the variable charge on the end face of montmorillonite is positive charge in the strongly acidic exchange system with a pH of 3,which is not conducive to the adsorption of OTAC on montmorillonite because of the electrostatic repulsion,the adsorption capacity and adsorption efficiency in montmorillonite are 0.943 CEC and 85.7% respectively,the gel viscosity of the prepared complex are μ_(0 min) 45.67 Pa·s and μ_(30 min )16.52 Pa·s respectively.In the weakly basic exchange system with a pH=10,because of the layers and faces of montmorillonite are both negatively charged,electrostatic attraction is more advantageous to the exchange of organic cation on montmorillonite interlayer and surface adsorption,the adsorption capacity and adsorption efficiency are 1.097 CEC and 99.71% respectively,the gel viscosity of the prepared composite are μ_(0 min) 95.93 Pa·s and μ_(30 min) 37.67 Pa·s respectively;In the strong alkaline exchange system with pH value11 and 13,due to the competitive adsorption of organic cations and sodium ions in layers and surfaces of montmorillonite,and coupled with the difficulty of the exchange of sodium ions in interlayer is increased,the adsorption capacity and adsorption efficiency of OTAC are decreased obviously,the adsorption capacity 1.08 CEC and 1.058 CEC respectively,the adsorption efficiency are 98.20% and 96.18% respectively.the gel viscosity μ_(0 min )and_(μ30 min )of the prepared complex are 96.52 Pa·s,93.52 Pa·s and 36.57 Pa·s,36.53 Pa·s respectively.
引文
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[3] 蒋明俊,张东浩,郭小川,等.膨润土的改性及膨润土润滑脂制备的实验研究[J].润滑与密封,2017,42(5):58-65.
[4] 霍锦华,张瑞,杨磊.CTAB诱导膨润土乳液转相机理及其在可逆乳化油基钻井液中的应用[J].石油学报,2018,39(1):122-128.
[5] 陈晓蕾.有机改性膨润土对选矿废水中丁铵黑药的吸附性能研究[D].山东大学,2018.
[6] Jemima W S,Magesan P,Chiranjeevi P,et al.Sorption Properties of Organo Modified Montmorillonite Clay for the Reclamation of Chromium (VI) from Waste Water[J].Silicon,2018(1-3):1-9.
[7] 张秀英.PVA/MMT纳米复合材料的制备与表征[J].山东理工大学学报(自然科学版),2017,31(1):60-63.
[8] 邱俊,陈平,张言贵,等.蒙脱石层电荷与有机改性蒙脱石凝胶性能关系研究[J].矿物岩石,2007,27(1):36-39.
[9] 邱俊,吕宪俊.十八烷基三甲基铵改性蒙脱石的结构和凝胶性能关系研究[J].矿物岩石,2007,27(4):17-21.
[10] 邱俊,王浩,陈平,等.不同类型烷基铵在蒙脱石中的吸附动力学特性[J].矿物岩石,2014,34(2):1-7.
[11] 吕宪俊,陈平.长碳链烷基铵在蒙脱石层间的吸附热力学[J].硅酸盐学报,2011,39(10):1553-1558.
[12] 谢广元.选矿学[M].徐州:中国矿业大学出版社,2016.
[13] 吴美芝,刘亚利,曾明.溴百里酚蓝标记分光光度法测定废水中季铵盐型表面活性剂[J].精细化工中间体,2002,32(6):55-57.
[14] Yariv S.Wettability of Clay Minerals[M].Modern Approaches to Wettability.Springer US,1992,85-94.
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