摘要
为了增加多壁碳纳米管(multiwall carbon nanotubers,MWNTs)对水中Cd2+的吸附量,使用混酸对多壁碳纳米管进行氧化处理,采用红外光谱进行结果表征,并探讨了吸附时间、pH值和MWNTs的使用量、Cd2+的浓度及干扰离子对镉离子吸附的影响。结果表明,吸附时间为1.5 h、pH为5.3、吸附效果最佳,随MWNTs量的增加Cd2+去除量增加,共存的阳离子会降低对Cd2+的吸附效果,对Cd2+的吸附符合Longmuir吸附定律。研究同时表明,pH小于2时Cd2+能容易从碳纳米管上解吸。初步探讨了Cd2+吸附机制。
In order to increase the adsorption amount of Cd2＋ in water,the multiwall carbon nanotubers were treated by mixed acid,and the result was characterized by IR.The treated MWNTs were used to adsorb the Cd2＋ in simulating water.The effect of adsorption time,pH,the amount of MWNTs,the concentration of Cd2＋ and interfering ion on the adsorption of Cd2＋ were discussed.The results indicated that optimal conditions of Cd2＋ adsorption on treated MWNTs were time of 1.5 h and pH of 5.3.The amount of Cd2＋ adsorption increased with increase of the amount of MWNTs,and effect of adsorption was depressed by existence of cation,the adsorption data fit the langmiur model and its linearized form well.Results of a desorption study showed that Cd2＋ adsorbed onto MWCNTs could be easily desorbed at pH 2.The mechanism of Cd2＋ adsorption was also discussed.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第5期1609-1612,共4页
Chinese Journal of Environmental Engineering
关键词
多壁碳纳米管
吸附
解吸
Cd2+
水处理
muiltiwall carbon nanotubers
adsorption
desorption
Cd2＋ ions
water treatment
