农业环境科学学报2016，Vol.35Issue(3)：463-470,8.DOI:10.11654/jaes.2016.03.008
Pb（Ⅱ）在天然土壤纳米颗粒上的吸附-解吸：pH和离子强度的影响
Adsorption-desorption of Pb(Ⅱ)on natural soil nanoparticles:Effects of pH and ionic strength
摘要
Abstract
Nanoparticles may play an important role in adsorption-desorption of heavy metals because of small sizes and huge surface area. In this study, natural soil nanoparticles were extracted from four typical soils, and adsorption and desorption of Pb(II)by natural soil nanoparticles were investigated under different pH and ionic strengths(IS). Results showed that amount of adsorbed Pb(II)on four differ-ent soil nanoparticles increased along with increases of pH when pH was lower than 3. Amount of Pb adsorption by four soil nanoparticles was in order of loessal soil>lou soil>aeolian sandy soil>black loam soil nanoparticles. Under different IS, adsorption rates of Pb by four soil nanoparticles varied greatly. The adsorption amount of Pb(II)in 0.01 mol·L- 1 NaCl solution was highest, but lowest in 0.1 mol·L- 1 NaCl solution. The inner surface adsorption complex was formed at low IS, while the outer surface complex happened at high IS. The desorp-tion rates of Pb decreased as pH values increased, with the highest desorption found at pH 3. In different IS solutions, the Pb desorption rates increased with increasing IS. The Pb desorption rates in four soil nanoparticles decreased in order of aeolian sandy soil colloid>lou soil colloid>black loam soil colloid>loessal soil colloid.关键词
pH/离子强度/天然土壤纳米颗粒/吸附/解吸Key words
pH/ionic strength/natural soil nanoparticle/adsorption/desorption分类
资源环境引用本文复制引用
安伟强,孙慧敏,吕家珑,殷宪强,韦革宏,李俊..Pb（Ⅱ）在天然土壤纳米颗粒上的吸附-解吸：pH和离子强度的影响[J].农业环境科学学报,2016,35(3):463-470,8.基金项目
国家高技术研究发展计划（863计划，2012AA101402）；国家自然科学基金（21207106,21207107）；陕西省自然科学基础研究计划项目（2012JQ5012，2014JQ5184）；中央高校基本科研业务专项 （）
