Chloromethylated Activated Carbon: A Useful New Synthon for Making a Novel Class of Sorbents for Heavy Metal Separations
Chloromethylated Activated Carbon: A Useful New Synthon for Making a Novel Class of Sorbents for Heavy Metal Separations
复制标题
DOI：
10.1080/01496390903423550
复制
发表时间：
2010-01-01
影响因子：
2.8
通讯作者：
Fryxell, Glen E.
中科院分区：
文献类型：
--
作者：
Samuels, William D.;LaFemina, Nikki H.;Fryxell, Glen E.
介绍了活性炭的氯甲基化反应。发现氯甲基化产生的碳衍生物的比表面积为1310 m2/g，孔结构没有显着变化。发现产物含有类似于1.5毫摩尔-CH 2Cl基团/g材料，类似于在原始梅里菲尔德树脂合成中报道的官能密度。用过量的硫代硫酸钠在无水甲醇中处理该物质，实现苄氯的置换。然后通过用温的3 M HCl处理水解所得的本特盐，干净地且以高产率得到相应的硫醇（“AC-CH 2-SH”）。AC-CH 2-SH被认为是一种有效的重金属吸附剂，有效地捕获Hg，Pb，Ag和Cu。吸附动力学是快速的，在不到30分钟内达到平衡。
The chloromethylation of activated carbon is described. Chloromethylation was found to produce a carbon derivative with a surface area of 1310 m(2)/g and no significant change in the pore structure. The product was found to contain similar to 1.5 mmole of -CH2Cl groups per g of material, similar to the functional density reported in the original Merrifield resin synthesis. Displacement of the benzylic chloride was achieved by treating this material with an excess of sodium thiosulfate in refluxing aqueous methanol. The resulting Bunte salt was then hydrolyzed by treatment with warm 3M HCl to afford the corresponding thiol ("AC-CH2-SH'') cleanly and in high yield. AC-CH2-SH was found to be an effective heavy metal sorbent, efficiently capturing Hg, Pb, Ag, and Cu. Sorption kinetics were rapid, with equilibrium achieved in less than 30 minutes.