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	改性活性炭吸附重金属镉的技术与机理
	冯子妍 ; 王小 ; 杨宏伟 ; 杨少霞 ; Feng Ziyan ; Wang Xiaomao ; Yang Hongwei ; Yang Shaoxia
	2016-03-30 ; 2016-03-30
关键词	改性活性炭 镉吸附 混酸氧化 TU991.2
其他题名	Technological Process and Mechanics of Adsorption of Heavy Metal Cadmium by Modified Activated Carbon
中文摘要	镉污染对饮用水安全造成了严重的威胁。活性炭吸附是水处理中最重要的处理方法之一,但是对镉等重金属的吸附较弱,通过改性可以改变活性炭的表面特性,从而促进对重金属的吸附。该文对活性炭进行了混酸氧化改性,臭氧氧化改性和乙二胺氨基化的改性,零电荷点和表面官能团大大发生变化,混酸改性后的零电荷点最低。通过吸附动力学的研究发现混酸改性的活性炭(AC—O)对镉的吸附效果最好,且更加符合二级动力学的吸附模型。对AC-O活性炭进行了不同p H下吸附热力学的研究,结果表明吸附等温线用Freundlich的热力学模型拟合比较好,并且p H越大越有利于镉的吸附,p H对AC-O吸附镉效果的影响试验也表明,由于零电荷点的影响,在p H小于9的情况下,随着p H的升高静电吸引力越强。; The pollution caused by cadmium is seriously threatening people's health. Adsorption by activated carbon is one of the most important ways in water treatment,but has little effect in heavy metal removal,which can be improved by modifying the surface characteristics. Modified granular activated carbon by oxidation of mixed acid,oxidation by ozone and amination by ethylenediamine were carried out,which had great changes in the activated carbon's surface functional groups and p Hpzc. The activated carbon modified by mixed acid has the lowest p Hpzc. The results of adsorption kinetics show that the modified activated carbon oxidized by mixed acid has the best removal efficiency of cadmium,which can be described by second-order kinetic equation better. The results of adsorption thermodynamics at different p H conditions indicates that the higher p H is,the better the adsorption effect of cadmium is,which can be described by Freundlich model better. The results of effects of p H on adsorption of cadmium by AC—O also indicates that when p H <9,the electrostatic attraction grows with the increase of p H.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/144353]
专题	清华大学
推荐引用方式 GB/T 7714	冯子妍,王小,杨宏伟,等. 改性活性炭吸附重金属镉的技术与机理[J],2016, 2016.
APA	冯子妍.,王小.,杨宏伟.,杨少霞.,Feng Ziyan.,...&Yang Shaoxia.(2016).改性活性炭吸附重金属镉的技术与机理..
MLA	冯子妍,et al."改性活性炭吸附重金属镉的技术与机理".(2016).

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