摘要
以黄姜皂素废渣为原料,制备成了生物炭,以硝酸铅水溶液作为模拟废水,采用降流式固定吸附床,模拟工业填充柱,分别考察了重金属铅离子溶液的吸附剂投加量、初始浓度、流速及初始pH值对生物炭动态吸附过程的影响.实验结果表明:生物炭能有效去除水中的重金属离子,随着重金属溶液初始浓度及流速的增大,穿透时间提前;增加生物炭的投加量,穿透时间延长;生物炭对水中铅离子动态吸附的穿透时间随pH值增大而延长.对实验数据进行了线性拟合,Thomas模型能较好地反映吸附过程特征,说明生物炭动态吸附铅离子是一个吸附位点一旦被吸附质占据后则吸附不再发生,而且没有轴向扩散.
Biochar made from the solid waste of diosgenin production was used as adsorbent.Effects of adsorbent dosage,initial concentration,flow rate and initial pH of lead ion solution on the adsorption process by biochar were investigated using down flow fixed bed with packed industrial column.The results show that biochar removes lead ion from aqueous solution efficiently as an adsorbent; the breakthrough time decreases with the increase of biochar dosage and pH value while increases with the increase of initial concentration and flow speed of lead ion solution.The data were analyzed using different mode1s.Linear fitting of experimental data reveal that Thomas model can reflect the characteristics of the adsorption process,which indicates that once a adsorption site occupied by a adsorbate,the adsorption can not occurred any more by the site,and there is no axial diffusion.
出处
《武汉工程大学学报》
CAS
2013年第10期32-35,共4页
Journal of Wuhan Institute of Technology
基金
武汉工程大学第四届研究生教育创新基金项目(编号CX201240)
关键词
动态吸附
穿透曲线
重金属
dynamic adsorption
breakthrough curve
heavy metal
