有机硅修饰的剥层水滑石及其对废水中金属离子的吸附(英文)  

Exfoliated LDHs Modified with Organic Silicon Regent and Their Adsorption to Metal Ions from Wastewater

作　　者：赵秀巧[1] 董丽君[1] 操越[1] 莫士净[1] 义建军[2] 徐庆红[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029 [2]中国石油天然气集团公司石油化学研究院,北京100083

出　　处：《无机化学学报》2013年第4期817-825,共9页Chinese Journal of Inorganic Chemistry

基　　金：the financial support from Project of National Natural Science Foundation of China(Project No.50602004);the financial support from Opening Project of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry of Jilin University~~

摘　　要：对剥层的镁铝硝酸根水滑石(Mg2Al-NO3-LDHs)片表面进行了有机硅化合物(N-(2-Aminoethyl)-3-aminopropyl)tris-(2-ethoxy)silane(KH-791)修饰,并研究了修饰后的水滑石片对废水中Pb2+,Cu2+和Zn2+离子的吸附行为。结果表明:在相同的温度和金属离子浓度条件下,被修饰的水滑石片对Pb2+吸附容量最大,达到378.0 mg.g-1;在以上几种金属离子的混合溶液中,修饰主体材料表现出对Pb2+高度的选择性吸附,对Pb2+吸附容量为85 mg.g-1,而对Zn2+和Cu2+的吸附容量只有30 mg.g-1左右。This work studies modified exfoliated layered double hydroxides （Mg2A1-NO3-LDHs） with N-（2-aminoethyl）-3-aminopropyhriethoxysilane [（CH3CH2O）3Si（CH2）3NH（CH2）2NH2, KH-791] by covalent bonding, and its selective adsorption to Pb^2＋, Cu^2＋, and Zn^2＋ ions from aqueous solutions. The adsorption capacity for Pb%2＋, Cu^2＋, and Zn^2＋ was monitored by atomic absorption technique at different metal concentrations and temperatures. Results indicate that Pb^2＋ ion has larger absorption capacity on the modified exfoliated Mg2Al-NO3-LDHs （EM-LDHs） than that of Cu^2＋ and Zn^2＋ ions under the same initial concentration and temperature. Compared with Pb^2＋ ion, the adsorption for Cu^2＋ or Zn^2＋ ion is less when the initial concentration is 500 μg·mL^-1. The influence of temperature on adsorption to Pb^2＋ ion by EM-LDHs is more significant than that of Cu^2＋ and Zn^2＋ ions.

关 键 词：吸附 表面及内表面 化学动力学平衡 剥层水滑石 

分 类 号：O614[理学—无机化学]