巯基修饰的钛酸纳米管吸附汞
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摘要
采用碱性水热法制备钛酸纳米管,再通过硅烷化反应在其表面修饰巯基.透射电镜和元素分析的表征结果表明巯基被成功的修饰到了钛酸纳米管的表面.基于巯基和Hg2+之间的"软—软"相亲作用,巯基修饰的钛酸纳米管(TNTs-SH)可用于水体中Hg2+的去除.在溶液p H为3~7的范围内,TNTs-SH对Hg2+的吸附没有明显的变化,表明该材料可以在酸性条件下有效的去除Hg2+.由Langmuir吸附等温模型拟合出Hg2+在TNTs-SH上的最大吸附量为134.23 mg/g,并且在较高的离子强度下,仍然保持了较高的吸附量.动力学研究表明Hg2+在TNTs-SH上的吸附过程符合二级反应动力学方程,吸附速率较快.
The titanate nanotubes( TNTs) were prepared by alkaline hydrothermal method,and the surface of TNTs were modified by thiol groups through silanization reaction. Characterization with transmission electron microscope and elemental analysis proved that thiol groups were successfully grafted on TNTs. Based on the strong interaction between Hg2 +and thiol groups,thiol groups modified TNTs( TNTs- SH) were applied for removal of Hg2 +from solution. When the solution p H ranged from 3 to 7,the adsorption capacity showed no obvious variation,indicating that TNTs- SH could remove Hg2 +effectively under acid condition. The maximum adsorption capacity calculated by Langmuir equation was 134. 23 mg / g at p H 6. 5,and TNTs- SH still maintained good adsorption capability in high salinity solution. The kinetic study showed that the adsorption of Hg2 +on TNTs- SH fitted well with pseudo-second order kinetic equation,and adsorption rate was quite fast.
The titanate nanotubes( TNTs) were prepared by alkaline hydrothermal method,and the surface of TNTs were modified by thiol groups through silanization reaction. Characterization with transmission electron microscope and elemental analysis proved that thiol groups were successfully grafted on TNTs. Based on the strong interaction between Hg2 +and thiol groups,thiol groups modified TNTs( TNTs- SH) were applied for removal of Hg2 +from solution. When the solution p H ranged from 3 to 7,the adsorption capacity showed no obvious variation,indicating that TNTs- SH could remove Hg2 +effectively under acid condition. The maximum adsorption capacity calculated by Langmuir equation was 134. 23 mg / g at p H 6. 5,and TNTs- SH still maintained good adsorption capability in high salinity solution. The kinetic study showed that the adsorption of Hg2 +on TNTs- SH fitted well with pseudo-second order kinetic equation,and adsorption rate was quite fast.
引文
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[2]Zhu J,Deng B,Yang J,et al.Modifying activated carbon with hybrid ligands for enhancing aqueous mercury removal[J].Carbon,2009,47:2014-2025.
[3]Zhu J,Yang J,Deng B.Enhanced mercury ion adsorption by amine-modified activated carbon[J].J Hazard Mater,2009,166:866-872.
[4]张新艳,王起超,张少庆,等.巯基功能化沸石吸附Hg2+特征及固化/稳定化含汞废物研究[J].环境科学学报,2009,29(10):2134-2140
[5]Labidi N S.Removal of mercury from aqueous solutions by waste brick[J].Int J Environ Res,2008,2:275-278.
[6]Anirudhan T S,Divya L,Ramachandran M.Mercury(II)removal from aqueous solutions and wastewaters using a novel cation exchanger derived from coconut coir pith and its recovery[J].J Hazard Mater,2008,157:620-627.
[7]Sari A,Tuzen M.Removal of mercury(II)from aqueous solution using moss(Drepanocladus revolvens)biomass:Equilibrium,thermodynamic and kinetic studies[J].J Hazard Mater,2009,171:500-507.
[8]Shawky H A,El-Aassar A H M,Abo-Zeid D E.Chitosan/carbon nanotube composite beads:Preparation,characterization,and cost evaluation for mercury removal from wastewater of some industrial cities in Egypt[J].J Appl Polym Sci,2012,125:E93-E101.
[9]Pan S,Shen H,Xu Q.et al.Surface mercapto engineered magnetic Fe3O4nanoadsorbent for the removal of mercury from aqueous solutions[J].J Colloid Interface Sci,2012,365:204-212.
[10]Niu Hongyun,Cai Yaqi,Shi Yali,et al.Cetyltrimethylammonium bromide-coated titanate nanotubes for solidphase extraction of phthalate esters from natural waters prior to high-performance liquid chromatography analysis[J].J Chromatogr A,2007,1172:113-120.
[11]韩云飞,刘文,王婷,等.Cd(II)、Zn(II)、Cu(II)和Cr(III)在钛酸纳米管上的吸附行为[J].环境化学,2013,32(11):2007-2015.
[12]安会琴,朱宝林,吴红艳,等.钛酸盐纳米管与二硫化碳修饰钛酸盐纳米管的合成、表征及其去除重金属离子性能[J].高等学校化学学报,2008,29(3):439-444.
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