农业土壤铁锰结核对铅的吸附特性  

Adsorption characteristics of Pb on ferromanganese nodules derived from agricultural soil

作　　者：范春辉 沈建辛 荣嘉欣 FAN Chunhui;SHEN Jianxin;RONG Jiaxin(College of Life Science,Shenyang Normal University,Shenyang 110034,China)

机构地区：[1]沈阳师范大学生命科学学院,沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2023年第6期510-514,共5页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(21407103)。

摘　　要：铁锰结核是土壤环境的重要成分,能够影响土壤组分的迁移转化,对土壤重金属有很强的结合能力。目前,对土壤铁锰结核吸附重金属的相关研究尚不完善。以农业土壤铁锰结核为研究样本,通过单因素和正交试验分析其对铅(Pb)的吸附行为。结果表明:铁锰结核对Pb的单位吸附量随反应时间的延长快速增加,60 min时的吸附量为5.84 mg·g^(-1),之后增幅变缓;温度和溶液初始pH对反应过程影响很小,但升高Pb溶液浓度、减小铁锰结核粒径都能促进Pb的吸附去除;增加铁锰结核量对Pb的单位吸附量影响不大;不考虑各因素交互作用时,铁锰结核吸附Pb的影响因素主次顺序依次为铁锰结核粒径、反应时间、Pb溶液浓度和溶液初始pH。As an important soil component,ferromanganese nodules affect greatly the transportation and transformation of soil elements,and always appear strong ability to adsorb metals in soil.Currently,the research of Pb adsorption on ferromanganese nodules needs to be improved comprehensively.Ferromanganese nodules derived from agricultural soil were selected in the experiment,and the single factor and orthogonal experiments were used to study the adsorption behavior.The results show that the adsorption capacity increases with longer reaction time,which reaches to 5.84 mg·g-1 at 60 min and then slows down.The process is affected little by temperature and initial pH of the solution,while the higher Pb concentration and lower ferromanganese nodules size might accelerate the reaction.The adsorption capacities of Pb are similar at different dosages of ferromanganese nodules.The most important factor for the adsorption process is ferromanganese nodules size,followed by the reaction time,Pb concentration and solution pH,respectively,without considering the multiple interactions among different experimental factors.

关 键 词：铁锰结核 吸附 铅 正交试验 农业土壤 

分 类 号：O647.3[理学—物理化学]