水稻秸秆生物炭对水中Pb^(2+)的吸附性能和机理研究  

Adsorption characteristic and mechanism of Lead(Ⅱ)by rice straw derived biochar

作　　者：彭莹[1] 张晓文[1] 张宇[1] 郑超文 吴苏煌 向杨 

机构地区：[1]南华大学环境与安全工程学院,湖南衡阳421001

出　　处：《环保科技》2017年第6期1-5,共5页Environmental Protection and Technology

基　　金：2015年衡阳市科学技术发展计划项目(2015KS04);南华大学大学生研究性学习和创新性实验计划项目(2016NH027XJXZ)

摘　　要：利用比表面积分析仪(BET)、X射线光电子能谱仪(XPS)研究了水稻秸秆生物炭的结构与性质,考察了吸附时间、固液比、pH等因素对生物炭吸附性能的影响,并探讨了生物炭材料对Pb^(2+)的吸附机理。结果表明:水溶液的pH值是影响生物炭吸附能力的关键因素;吸附过程符合准二次动力学方程,等温吸附过程符合Langmuir方程式,并且通过Langmuir方程式求出其最大吸附量高达60.57 mg/g;水稻秸秆生物炭对Pb^(2+)吸附是以化学吸附为主。T h e structure and properties of rice straw biochar were studied by B E T and X P S . Theeffects of adsorption time,solid - liquid ratio and p H on the adsorption properties of biochar were in-vestigated and the adsorption m e c h a n i s m of lead by biochar materials was also discussed through theadsorption isotherms and kinetics. The results showed that the p H value of aqueous solution had acrucial influence on the adsorption capacity of rice straw biochar. T h e adsorption process accords with the pseudo - second - order kinetics and the isothermal adsorption process conforms to muir equation, which can calculate the m a x i m u m adsorption a m o u n t, as high as 60. 57 m g/g. It canbe inferred that the adsorption of P b2 ＋ on rice straw biochar is mainly chemisorption.

关 键 词：生物炭 铅 水稻秸秆 热力学 化学吸附 

分 类 号：X703.1[环境科学与工程—环境工程]