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| Sorption of Silver Nanoparticles on Four Soils with Different Characteristics |
| Received:December 31, 2014 |
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| KeyWord:silver nanoparticles;soil;adsorption isotherm;aggregation |
| Author Name | Affiliation | E-mail | | DU Huan | College of Resources and Environmental Sciences, Anhui Agricultural University, Hefei 230036, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Yu-jun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | yjwang@issas.ac.cn | | LI Cheng-cheng | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | FAN Ting-ting | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | SI You-bin | College of Resources and Environmental Sciences, Anhui Agricultural University, Hefei 230036, China | ybsi2002@aliyun.com |
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| Abstract: |
| Large amount of silver nanoparticles(AgNPs) are being used in a wide range of aspects, which exhibited great risk to soil environment. The environmental fates of AgNPs in soil are markedly affected by AgNP stability and soil physicochemical properties. In this study,isothermal sorption of AgNPs on four types of soils with different physicochemical properties was investigated in the presence and the absence of Ca2+. The sorption isotherms of AgNPs on soils were well described with Freundlich isotherm equation. Soil pH and organic matter significantly affected the sorption of AgNPs by soils. The sorption amount of AgNPs on the acid soils was higher than that on the neutral soils. At the same soil pH,soil organic matter increased the AgNPs sorption capacity. The presence of Ca2+ generally increased the sorption capacity of AgNPs on these soils, but such effect showed slight difference between neutral and acid soils. In neutral soil, AgNPs sorption capacity increased with increasing Ca2+ concentrations from 0.1 mmol·L-1 to 10 mmol·L-1, whereas in acidic soil the sorption capacity showed "first increase and then decrease" over Ca concentrations. These results would be beneficial for environmental risk assessment of AgNPs. |
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