摘   要:随着全球经济化的迅速发展，造成土壤污染的途径愈发增加，其中重金属污染是造成土壤环境破坏的重要方式之一，各类含有重金属的污染物通过物理、化学以及生物等方式进入土壤，破坏了土壤原有的功能和生态。土壤重金属污染将会极大地影响农作物产量和质量的下降，并通过食物链被富集到人类以及各类生物体体内，对各种生物的生长发育有极大的威胁，也会导致大气和水环境质量的进一步恶化。本篇文章研究的课题是有机无机阻控剂对Zn2+吸附特性的影响，采用蚓粪和纳米三氧化二铁（n-Fe2O3）以三种不同的比例混合（100%蚓粪，95%蚓粪+5%n-Fe2O3，90%蚓粪+10%n-Fe2O3，以V，VF1，VF2表示）以制备阻控剂，以这三种不同比例的有机无机混合材料对Zn2+的吸附性能研究，通过控制不同的因素研究重金属Zn2+被阻控剂吸附的等温吸附对吸附量和解吸量的影响及时间动力学。实验结果表明：在固定的浓度范围内，以五种不同的温度下有机无机阻控剂对Zn2+的吸附量随着温度的上升而增加，对Zn2+的吸附等温线的以Freundlich方程的拟合最优。从Freundlich方程拟合图表来看，三种不同配比的阻控剂对Zn2+的吸附效果最好是V；若以时间动力学的图表来看随着时间的增加，三种配比的阻控剂对Zn2+的吸附量没有太大的改变，整体趋于平稳。从时间动力学方程中的准二级动力学方程相较来说是最优的模型。

 关键词：蚓粪；纳米三氧化二铁；Zn；重金属；时间动力学；吸附；解吸

Abstract:With the rapid development of global economic development, the ways to cause soil pollution have increased. Among them, heavy metal pollution is one of the important ways to cause environmental damage to the soil. All types of pollutants containing heavy metals enter the soil through physical, chemical and biological means. Destroyed the original function and ecology of the soil. Soil heavy metal pollution will greatly affect the decline of crop yield and quality, and will be enriched in humans and various organisms through the food chain. It will greatly threaten the growth and development of various organisms and will also lead to the quality of atmospheric and water environment deteriorated further. The research topic in this article is the effect of organic and inorganic inhibitors on the adsorption characteristics of Zn2+, using vermicompost and nano-ferric oxide in three different proportions(100% vermicompost, 95% vermicompost + 5% nano-iron trioxide, 90% vermicompost + 10% nano-iron trioxide, expressed as V, VF1, VF2) to prepare a controlling agent. The adsorption performance of these three different proportions of organic-inorganic hybrid materials on Zn2+ was studied by controlling different factors to study the influence of soot adsorption on adsorption and desorption amounts of heavy metal Zn2+ -inhibitors and the time kinetics.

Experimental results show: In a fixed concentration range, the adsorption of Zn2+ by organic-inorganic inhibitors at five different temperatures increases with increasing temperature. The fitting of Freundlich equation to the adsorption isotherms of Zn2+. From the Freundlich equation fitting chart, the best adsorption effect of Zn2+ with three different ratios of the control agent is V; If the time dynamics diagram is used, the absorption of Zn2+ by the three proportioning agents does not change much, and the overall trend is stable. The pseudo-second-order kinetic equations in the time-dynamic equation are relatively optimal models.

 Key words: vermicompost; Nano-iron trioxide; heavy metal; Zn; Time dynamics; adsorption; desorption

目录

1. 引言 1

2. 材料与方法 3

2.1蚓粪以及蚓粪-n-Fe2O3复合阻控剂样品的制备 3

2.2吸附实验 4

2.2.1 Zn2+储备溶液（10g·L-1）的配制 4

2.2.2 Zn2+的吸附实验 4

2.2.3解吸实验 5