牛粪蚓粪及其生物炭对Zn的吸附特性的差异研究

摘要本文以牛粪、蚓粪为原料，并在马弗炉中于350℃和700℃下烧制其生物炭。通过对牛粪、蚓粪及其生物炭对Zn2+的等温吸附解吸特性、不同pH的背景溶液对生物炭吸附Zn的影响、吸附动力学、吸附机制实验用原子吸收分光光度计测量Zn2+吸附解吸量。等温曲线通过Henry、Langmuir和Freundlichd等温方程对其拟合结果进行分析，从而为水中重金属离子的经济、有效去除提供理论依据。结果表明，随着Zn2+的浓度上升，牛粪、蚓粪及其生物炭的吸附量逐渐上升，蚓粪对Zn2+吸附能力大于牛粪的吸附能力。Langmuir方程能更好的拟合牛粪、蚓粪及其生物炭对水溶液中的Zn2+的等温吸附。牛粪、蚓粪及其生物炭对Zn2+的解吸率随吸附率的下降而增加,蚓粪中吸附的Zn2+更容易被解吸。牛粪和蚓粪的吸附速率均较快，30min内可以快速的进行反应，随着吸附时间的增加，反应较为平缓。牛粪、蚓粪及其生物炭吸附水中的Zn2+可以用准二级动力学方程很好的进行描述。随着pH的增加，吸附量逐渐变大。当pH=7时，生物炭对Zn2+的吸附量Qe最大，吸附能力最强.48363
Abstract: The paper with cow dung,vermicompost as raw material and in the muffle furnace under 350℃ and 700℃ fire the biochar.Through of cow dung,vermicompost and biochar isothermal adsorption desorption characteristics of Zn2+ ,the backgroung of the differences pH solution for biochar Zinc adsorption,adsorption kinetic,adsorption mechanism of experimental measured with atomic absorption spectrophotometer Zn2+ adsorption desorption quantitly.Isothermal curve by Herry,Langmuir and Freundlichd isothermal equation to analyze the fitting result,research and for economic and effective removal of heavy metal ion in water.The results showed that Zn2+ adsorption was increased with the increasing intial concentration within the range of Zn2+ concentrtions used in the experiment,and vericompost had a much higher Zn2+ adsorption capacity than cow dung.The adsorption isotherm of Zn2+ by the absorbent could signifcantly conform to Landmuir equtions.Cow dung,vermicompost and biochar of Zn2+ desorption rate increases with the adsorption rate of decline.Cow dung is easier for Zn2+ to release from vermicompost.The Zn2+adsorption rate of cow dung,vermicompost and biochar are faster,can quickly respond within 30 minutes.With adsorption time elongating,Zn2+ adsorption by is relatively flat.Cow dung,vermicompost and biochar of Zn2+ could be fitted by the puasi-second order equation.With the increase of pH,adsorption increase gradually.When pH=7,the adsorption quantity of biochar is the largest strongest.
毕业论文关键词：牛粪；蚓粪；吸附；解吸；动力学；Zn
Keyword: cow dung；vermicompost；adsorption；desorption；dynamics；Zn
目    录
摘要•2
Abstract•2
引言•4
    1.材料与方法5
1.1供试材料5
1.2研究方法5
    1.2.1溶液的制备方法5
    1.2.2吸附特性研究5
    1.2.3计算方法6
2.结果与分析 •      6
   2.1牛粪、蚓粪及其生物炭对Zn2+的吸附特性6•
        2.1.1牛粪及其生物炭对Zn2+的吸附特性6
        2.1.2蚓粪及其生物炭对Zn2+的吸附特性7
2.2牛粪、蚓粪及其生物炭对Zn2+的解吸特性8
    2.2.1牛粪及其生物炭对Zn2+的解吸特性8
    2.2.1蚓粪及其生物炭对Zn2+的解吸特性9
      2.3不同振荡时间下，牛粪蚓粪及其生物炭对Zn2+的吸附动力学9
    2.3.1牛粪及其生物炭对Zn2+的吸附动力学9
    2.3.2蚓粪及其生物炭对Zn2+的吸附动力学9 牛粪蚓粪及其生物炭对Zn的吸附特性的差异研究:http://www.youerw.com/shengwu/lunwen_50939.html