摘要
本文主要研究了改性对活性炭的表面物理化学特性和对其吸附金属离子性能的影响．研究发现,硝酸氧化可显著增加活性炭表面酸性基团的含量,提高活性炭的表面亲水性,降低ｐＨｐｚｃ值,并造成活性炭的结构塌陷和比表面积的减少,因而对活性炭吸附性能产生明显影响,可明显提高对附Ｐｂ２＋等金属离子的吸附容量．
The surface chemistry properties of activated carbos have significant induence on its adsorptionperformance.The purpose of studies on the surface modification of activated carbon lies in makingclear the effect of chemical factors in order to provide the basis for carbo choosing and the directionof carbon activation and modification.The influence of surface modification on the physical andchemistry properties of activated carbons and the adsorption performance was demonstrated in thispaper.The results showed that the acid surface functional groups of activated carbon increased con-siderably after oxidation with nitric acid. The carbon surface was structuraly destroyed and becamemore hydrophilic with low pHpzc value and low surface area. Therefore,the adsorption performanceof modified carbon was seriously affected,while the adsorption capacities of heavy metal ions likePb2+ increased considerably.
出处
《环境化学》
CAS
CSCD
北大核心
2001年第5期437-443,共7页
Environmental Chemistry
基金
国家九五攻关课题:96-909-03-03-02
活性炭的表面改性I.
