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| Adsorption-desorption of Pb(Ⅱ) on natural soil nanoparticles:Effects of pH and ionic strength |
| Received:October 26, 2015 |
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| KeyWord:pH;ionic strength;natural soil nanoparticle;adsorption;desorption |
| Author Name | Affiliation | E-mail | | AN Wei-qiang | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | SUN Hui-min | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | LÜ Jia-long | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | ljlll@nwsuaf.edu.cn; | | YIN Xian-qiang | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | xianqiangyin@yahoo.com; | | WEI Ge-hong | College of Life Science, Northwest A & F University, Yangling 712100, China | | | LI Jun | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | |
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| 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 different 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 desorption 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. |
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