摘要
为了研究柠檬渣微波改性后的吸附性能,测量了改性柠檬渣对pb^(2+)的吸附率、柠檬渣的比表面积(BET)、灰分、碘吸附值和孔结构;并利用红外光谱(IR)、紫外光谱(UV)、差热分析(TG-DTA)、扫描电镜(SEM)和能谱(EDS)对柠檬渣进行了表征。微波改性的柠檬渣对pb^(2+)吸附率比化学改性和预处理后的柠檬渣都有明显增加。与化学改性相比,柠檬渣经微波改性后比表面积有所减小,灰分率增大近5倍,碘吸附值增大近1.5倍;产生羧基和内酯基的量相对较多,酚羟基产生的量相对较少。改性柠檬渣吸附pb^(2+)后,总体骨架没有改变。微波改性柠檬渣在206 nm左右处有最大紫外吸收峰,吸附pb^(2+)后在192 nm左右处出现最大吸收峰。微波改性的柠檬渣和吸附pb^(2+)后的柠檬渣都有三个失重过程,主要由碳组成,pb^(2+)能被改性柠檬渣有效吸附,但pb^(2+)的重量和原子百分比都不高。改性后的柠檬渣表面变得疏松,孔数量明显增加。
In order to study the adsorption properties of lemon residues modified by microwave,the adsorption rates for pb^2＋,specific surface area（BET）,ash rate,iodine adsorption value and pore structure of the modified lemon residue were detected,and the structures of lemon residue were characterized by IR,UV,TGDTA,SEM/EDS. Compared to the lemon residue that was treated chemically and pre-treated,the adsorption rates of lemon residue modified by microwave,increased significantly. Compared to chemical treatment,for the lemon residue modified by microwave,the specific surface area decreased,the ash rate increased by nearly 5 times,and the iodine adsorption value increased by nearly 1.5 times,the amount of carboxyl group and lactones group was relatively large,and the amount of lactones group was relatively small. After the modified lemon residue absorbed pb^2＋,the overall framework did not change. Before and after absorbing pb^2＋,the maximum UV absorption peak of the modified lemon residues was about 206 nm and 192 nm,the lemon residue modified by microwave had three weight loss processes,and were mainly composed of carbon. The pb^2＋ can be adsorbed by the modified lemon residues effectively,but the weight and atomic percentage of pb^2＋ were not high. The surface of the modified lemon residues became loose,and the number of holes increased obviously.
出处
《天然产物研究与开发》
CAS
CSCD
北大核心
2017年第5期826-830,872,共6页
Natural Product Research and Development
基金
2014年四川省教育厅重点项目(14ZA0247)
内江师范学院大学生创新创业训练计划项目(X201526)
关键词
柠檬渣
微波
改性
吸附
lemon residues
microwave
modification
adsorption
作者简介
通信作者,E-mail：sqw7418@163．com
