三种活性炭对低浓度Cu^(2+)、Zn^(2+)的吸附性能  

The Adsorption of Three Kinds of Active Carbon to Low Concentration Cu^(2+) and Zn^(2+)

作　　者：李松[1] 雷冬飞[1] 黎国兰[1] 李志蓉[1] 刘荷[1] 余翔[1] 

机构地区：[1]绵阳师范学院化学与化学工程学院,四川绵阳621000

出　　处：《绵阳师范学院学报》2010年第5期45-49,共5页Journal of Mianyang Teachers＇ College

摘　　要：用竹炭、煤质活性炭及过二硫酸铵氧化处理的煤质活性炭作为吸附剂,研究了三种活性炭对低浓度的铜、锌离子的吸附性能,采用N2吸附等温线、Boemh滴定及零电荷点测定等对活性炭进行表征。经氧化处理后,煤质活性炭的表面含氧官能团增多,尤其是羧基的含量显著增加,pHPZC值降低,较未氧化的煤质活性炭有更高的Cu2+、Zn2+的吸附容量。竹炭对Cu2+、Zn2+的吸附表现出较好的性能,对浓度为8mg.L-1的Cu2+、Zn2+溶液,吸附量分别达到1.87 mg.g-1及2.2 mg.g-1,与氧化后的煤质活性炭较为接近,作为对水中微量金属元素的吸附剂具有良好的开发前景。Bamboo-carbon made in our laboratory,coal-based active carbon and its derivative obtained by oxidization of ammonium persulphate are employed as adsorbent to study the adsorption of three kinds of active carbon to low concentration copper and zinc ions.The influence of surface oxygen-containing functional groups on the adsorption behavior of Zn2＋ and Cu2＋ has been investigated.These carbon samples are characterized by nitrogen adsorption,Boemh＇s titration and point of zero charge（pHPZC）.Characterization results show that the surface oxygen content of coal active carbon increased after oxidization treatment,and especially carboxyl and carbonyl groups increased significantly with a decrease of zero point of charge（pHPZC）.The bamboo carbon exhibited the highest adsorption capacity among three kinds of active carbon,the adsorption capacity of which to the solution of Cu2＋ and Zn2＋ with a concentration of 8mg·L-18mg·L-1 is 1.87mg·g-1 and 2.2 mg·g-1 respectively.Compared with coal active carbon,bamboo-carbon shows a satisfactory adsorption capacity,so it is promising for industrial application to adsorb metal ion in water treatment.

关 键 词：活性炭 吸附 铜 锌 竹炭 

分 类 号：O647.3[理学—物理化学]