胺化处理的纳米孔炭材料上汞(II)离子吸附性能

Adsorption Performance of Hg(II) Ions on Amine-Modified Nanoporous Carbon Materials

研究了纳米孔炭(NC)及乙二胺修饰的NC材料(NC-EDA)对水溶液中汞离子的吸附性能.结果表明:NC材料对汞离子具有吸附能力;经乙二胺修饰后,材料的吸附性能显著提高;并且NC-EDA材料经高温(873K)处理后依然能够保持良好的吸附性能.结合各种表征结果,可以认为NC材料表面所富含的-COOH、-OH等基团有利于有机胺配体的引入,使材料表面存在大量的碱性含氮物种.这类碱性物种能够与汞离子发生较强的相互作用,从而使材料表现出良好的汞离子吸附性能.

The adsorption performance of nanoporous carbon （NC） and ethylenediamine-modified nanoporous carbon （NC-EDA） toward Hg2＋ ions was investigated in an aqueous solution. The NC material exhibited a relatively high adsorption capacity for Hg2＋ ions, and the adsorption capacity was improved significantly by ethylenediamine modification. After thermal-treatment at 873 K, the adsorption capacity of the NC-EDA material was still relatively high. Based on various characterization results, we propose that the presence of abundant functional groups （i.e.,-COOH,-OH） on the surface of the NC materials is beneficial for the introduction of a large number of amino functional groups resulting in the presence of abundant basic N-containing species on the surface of the NC materials. These basic species can interact with mercury ions and thus significantly improve the adsorption capacity of the carbon material.