甲醛吸附用载铜活性炭孔结构和表面化学性质研究  

Influences of Pore Structure and Surface Chemical Properties on Removal Performance of Formaldehyde by the Copper Loaded Activated Carbon

作　　者：张双双[1] 李伟[1] 赵鑫[1] 刘丽华[1] 吴艳姣[1] 刘守新[1] 

机构地区：[1]东北林业大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《林产化学与工业》2015年第3期1-7,共7页Chemistry and Industry of Forest Products

基　　金：'十二五'国家科技支撑计划资助(2012BAD32B04);国家自然科学基金资助项目(31170545);中央高校基本科研业务费专项资金资助(2572014EB01)

摘　　要：采用CuC l2溶液对椰壳活性炭进行改性,制备高容量甲醛吸附活性炭。以扫描电镜(SEM)观测改性前后活性炭的表面形貌;用低温液氮吸附(N2/77K)来表征铜盐浓度的改变对活性炭孔隙结构的影响;用X射线光电子能谱(XPS)分析活性炭表面元素组成及存在形式;用X射线衍射(XRD)研究载铜活性炭的晶形结构;以常温动态吸附评价活性炭对甲醛的吸附性能。研究结果表明:改性活性炭中铜以Cu、CuC l及CuC l23种形式存在,改性活性炭微孔数量减少,介孔比例提高;同时,随铜盐浓度增加,活性炭的比表面积和孔容减少,平均孔径变大;改性后活性炭表面含氧官能团数量增加。当CuC l2浓度为0.5 mol/L时,制备的改性活性炭对甲醛的吸附容量(4.28 mg/g)是原料活性炭(1.38 mg/g)的3.1倍,甲醛在改性活性炭上的吸附行为符合Freundlich吸附模型。The impregnation of Cu Cl2 on coconut shell based activated carbon was investigated for efficient formaldehyde removals. Scanning electron microscopy（ SEM） was used for morphology structure observation. Nitrogen adsorption isotherm was employed for pore structure analysis. The surface elements of activated carbon were tested by XPS. XRD was used for analyzing the crystal forms of cupric salt. Dynamic studies of formaldehyde adsorption at room temperature was carried out by adsorption performance test. The results showed that cupric salt existed in three forms,i. e.,Cu,Cu Cl and Cu Cl2. The increment of Cu loading leads to the decreasing of surface area and pore volume of activated carbon,and the increasing of average pore diameter.After modification,the surface oxygenated groups on the surface of activated carbon increased. When Cu Cl2 concentration was0. 5 mol / L,formaldehyde adsorption capacity（ 4. 28 mg / g） of the modified activated carbon was 3. 1 times than that of the original one（ 1. 38 mg / g）. Adsorption behavior of formaldehyde on modified activated carbons fitted Freundlich adsorption isotherm well.

关 键 词：活性炭 铜盐 改性活性炭 吸附 甲醛 

分 类 号：TQ424.1[化学工程]