介孔活性炭表面改性对两种农用抗生素吸附性能的影响  

Effect of surface modification on mesoporous activated carbon's adsorption capacity to two agro-antibiotics

作　　者：孙长娇[1] 王琰[1] 崔海信[1] 姜建芳[1] 

机构地区：[1]中国农业科学院农业环境与可持续发展研究所,北京100081

出　　处：《农药学学报》2012年第1期89-94,共6页Chinese Journal of Pesticide Science

基　　金：国家高技术研究发展计划(863计划)重大项目(2011AA10A201)

摘　　要：研究了介孔活性炭通过用硝酸和氨水进行表面改性后对2种农用抗生素———阿维菌素和井冈霉素吸附性能的影响。结果表明:硝酸可增加介孔活性炭表面的酸性亲水基团,从而增加了对亲水性药物井冈霉素的吸附量,但却降低了对疏水性药物阿维菌素的吸附量;但当硝酸质量分数超过55%、温度超过60℃时,硝酸的强氧化作用会破坏活性炭的部分孔隙结构,使其对井冈霉素的吸附量有所下降。与之相反,氨水则因减少了介孔活性炭表面的酸性亲水基团而对阿维菌素的吸附量有所上升。利用SAS统计软件进行相关性分析,证实介孔活性炭表面酸性基团数量、尤其是羧基的数量与其对井冈霉素和阿维菌素的吸附量呈极显著相关,相关系数分别为0.560 2和-0.873 7。由此推断:增加介孔活性炭表面的酸性亲水基团,可以在一定程度上增加活性炭对亲水性药物的吸附量;而增加疏水性基团,则可以增加其对疏水性药物的吸附量。The effect of surface modification of mesoporous activated carbon by nitric acid and ammonia on its adsorption capacity to two kinds of agro-antibiotics—abamectin and validamycin was investigated.The results showed that mesoporous activated carbon modified by nitric acid increased the adsorption capacity to the hydrophilic,validamycin,while decreased the adsorption capacity to the hydrophobic,abamectin.This may be attributed to the increase of hydrophilic acidic groups of the surface after the modification.However,when the concentration of nitric acid increased to 55% and the temperature increased to 60 ℃,the strong oxidation of nitric acid might lead to the destruction of internal pore structure of activated carbon,and weakened the adsorption to valiadamycin.By contrast,the surface hydrophilic acidic groups were reduced after modification by ammonia,which leaded to the increased adsorption capacity to abamectin.SAS statistical analysis indicated that the amount of acidic groups,in particular,carboxyl had significant correlation with the adsorption of mesoporous activated carbon to abamectin and validamycin,and the correlation coefficient was 0.560 2 and-0.873 7 respectively.Therefore,it deduced that increasing surface acidic hydrophilic groups of mesoporous activated carbon would improve its adsorption to hydrophilic agro-antibiotics to some extent,while increasing surface hydrophobic groups of mesoporous activated carbon would improve its adsorption to hydrophobic agro-antibiotics.

关 键 词：介孔活性炭 农药载体 表面改性 阿维菌素 井冈霉素 吸附量 

分 类 号：TQ450.6[化学工程—农药化工]