摘要
为研究柠檬渣对Cu^(2+)、Pb^(2+)和Cr^(6+)的吸附性能,利用10%的H3BO3对柠檬渣进行了改性,比较了改性前后柠檬渣对Cu^(2+)、Pb^(2+)和Cr^(6+)的吸附效果,并利用差热分析(TG-DTA)、红外光谱(IR)、紫外光谱(UV)、X射线衍射仪(XRD)、扫描电镜(SEM)和能谱(EDS)对柠檬渣进行了表征.结果表明:改性后的柠檬渣对Cu^(2+)、Pb^(2+)和Cr^(6+)的吸附率分别为预处理后柠檬渣的5.89、2.07和1.38倍;改性后柠檬渣的孔径为中孔,孔容增大了3.0倍,孔径和碘吸附值变化不大,灰分率减小了近4倍,比表面积增大超过了2倍.改性后的柠檬渣在近紫外区有最大吸收波长;改性和吸附Cu^(2+)、Pb^(2+)和Cr^(6+)样品的TG和DTA曲线不完全相同;柠檬渣为非晶型结构,主要由C组成;吸附Cu^(2+)、Pb^(2+)、Cr^(6+)后的改性柠檬渣均各自含有Cu、Pb、Cr元素,但形成的能谱(EDS)峰不高.研究显示,柠檬渣经10%的H3BO3改性后能显著提高对Cu^(2+)和Pb^(2+)的吸附性能,而对Cr^(6+)的吸附性能影响不大.
In order to investigate the adsorption properties of lemon residues for Cu^2＋,Pb^2＋and Cr^6＋,lemon residues were modified by chemical methods with 10% H_3BO_3. The effects of lemon residues on Cu^2＋,Pb^2＋and Cr^6＋adsorption were measured before and after modification. The lemon residues were further characterized by TG-DTA,IR,UV,XRD and SEM/EDS. The adsorption efficiencies for Cu^2＋,Pb^2＋and Cr^6＋of the modified lemon residue were increased about 5. 89,2. 07 and 1. 38 times higher than lemon residue after pretreatment,respectively. The modified lemon residue shared a lot of mesopores. The pore volume increased about three times compared with an unmodified sample. The change of the pore size and absorption capacity of iodine was not much observed,and the ash content decreased about four times,while the specific surface areas increased over two times. The maximum absorption band for the modified lemon residues was located at the near ultraviolet region. The TG and DTA curves of the modified and adsorped samples for Cu^2＋,Pb^2＋and Cr^6＋were not exactly the same. The structure of the lemon residues were the amorphous structure,which was mainly composed of C.The modified lemon residue that absorbed Cu^2＋,Pb^2＋and Cr^6＋contained Cu,Pb and Cr elements respectively,but the formation peak of the EDS was not high. The modified residues could effectively remove Cu2 ＋and Pb2 ＋. In contrast,the adsorption capacity of Cr6 ＋had little effect.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2017年第1期152-158,共7页
Research of Environmental Sciences
基金
2013年四川省教育厅重点项目(13ZA0002)
关键词
柠檬渣
吸附
改性
lemon residues
adsorption
modification
作者简介
沈王庆（1974-），男，安徽望江人，副教授，主要从事化工工艺研究，383734063@qq．com．
