牛粪源蚓粪及其生物炭对PbCd吸附特性研究

摘要随着现在科技发展越来越迅速，对环境的污染也日益严重。尤其是重金属对环境的污染，重金属具有富集性，很难在环境中降解，很容易危害到人类的身体健康。因此，去除水和土壤中的重金属污染是当下最重要的任务。本篇研究的课题是牛粪源蚓粪及其生物炭对Pb、Cd吸附特性的研究。选用的是牛粪源蚓粪，在三种不同温度下(0℃、350℃、700℃)制备的生物炭作为吸附剂，以CV、CVC350、CVC700表示，就蚓粪生物炭对Pb2+、Cd2+的吸附性能来进行研究，等温吸附对吸附量和解吸量的影响及时间动力学。76528

实验结果表明：在一定的浓度范围下，三种不同温度的蚓粪生物炭对Pb2+、Cd2+的吸附量随着Pb2+、Cd2+浓度的增加而增大，对Pb2+、Cd2+的吸附等温线的以Langmuir方程的拟合最优。从Langmuir方程拟合来看，3种温度的生物炭对Pb的吸附，最好的是CV（R2=0。9928）；对Cd的吸附，最好也是CV（R2=0。9980）从时间动力学来看，一开始随着时间的增加，蚓粪生物炭对Pb、Cd的吸附量不断上升，到了一定的时间，吸附量不再随着时间的增加而上升，而是趋于平缓状态。叶洛维奇（Elovich）动力学方程较一级动力学方程、二级动力学方程和两个常量方程来说，是描述Pb2+、Cd2+在牛粪源蚓粪中的吸附动力过程的最优模型。

Abstract With the rapid development of science and technology ,meanwhile, environmental pollution is increasingly getting worse ,especially the heavy metal pollution to the environment。 Because heavy metals themselves have the enrichment property , they are hard to be degraded in the environment。 Consequently , they are easy to put human health in danger。 Therefore, the most important task nowadays is to remove the heavy metals in the water and soil pollution。 The topic of this paper mainly focuses on researching the absorption properties of Pb/Cd onto vermicompost and its biochar。 Choosing vermicompost as materials and biochar prepared under three various temperatures conditions(0℃、350℃、700℃) as absorbent, then we carry out the research about absorption properties of Pb2+/Cd2+ onto vermicompost and its biochar，and the effect that isothermal absorption on absorption quantity and desorption quantity ,and time dynamics。

The experimental results show that within certain concentration range, the absorption quantity of Pb2+/Cd2+ onto vermicompost and its biochar under three various temperatures increases with the increase of the Pb2+ and Cd2+’s concentration。 For Pb2+ and Cd2+’s absorption isotherm ,Langmuir equation is proposed and the optimal。 Seen from the Langmuir equation fitting, the absorption of Pb onto biochar under three various temperatures, the best is CV (R2=0。9928),and the same result to Cd as well (R2=0。9980)。From the point of time dynamics, with the increase of time, the absorption quantity of Pb、Cd onto vermicompost and its biochar keeps rising at first, afterwards, to a certain time , absorption quantity keeps unchanged then , about keeping a steady state。Compared to the first-order dynamics equation, the secondary dynamics equation and two constant equations, Elovich dynamics equation is the optimal model to describe the absorption dynamics process of Pb2+ /Cd2+’s being in vermicompost。

毕业论文关键词：蚓粪；重金属；生物炭；Cd；Pb；吸附；解吸；时间动力学；

Key words: vermicompost;heavy metal;biochar;Cd;Pb;adsorption;desorption;Time dynamics

目录 3

1。引言 4

2。材料与方法 6

2。1蚓粪生物炭样品的制备 6

2。2吸附实验 6

2。2。1铅、镉储备溶液（100g·L-1）的配制：牛粪源蚓粪及其生物炭对PbCd吸附特性研究:http://www.youerw.com/huaxue/lunwen_87796.html