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| Influence of non-dissolved organic matter on the adsorption and aging of copper in riverbank soil |
| Received:November 19, 2020 |
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| KeyWord:non-dissolved organic matter;riverbank soil;copper;adsorption amount;aging |
| Author Name | Affiliation | E-mail | | CHEN Lingyuan | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | | | HE Haixia | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | | | ZHAO Youlin | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | | | HE Hongqing | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | | | CHEN Shuangli | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | | | LI Wenbin | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | lwb062@163.com | | DENG Hongyan | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | | | REN Zhaogang | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | |
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| Abstract: |
| Riverbank soil is the last barrier blocking runoff pollution into the river water body. To explore the effect of non-dissolved organic matter(NDOM) on copper adsorption and aging in watershed soils, soils along Guangyuan, Nanbu, Nanchong, and Hechuan from the Jialing River(Sichuan-Chongqing section) were chosen as the research object. Alternanthera philoxeroides, lemon pomace, and sludge NDOM were added to the riverbank soils in a 10% ratio to study the isotherm adsorption of copper(Cu2+) by NDOM-amended soil under different environmental conditions. The aging characteristics of Cu2+ in the different NDOM-amended soil treatments were analyzed. The results showed that:compared with lemon pomace and A. philoxeroides, the sludge NDOM-amended soil exhibited a better adsorption effect on Cu2+. The Cu2+ adsorption amount on different NDOM-amended soil samples was proportional to the cation exchange capacity and specific surface area of the soil. The Langmuir model was better suited to describing the Cu2+ adsorption process on the NDOM-amended soil than the Freundlich model. An increase in temperature promoted Cu2+ adsorption, which is a spontaneous, endothermic, and entropyadding process. The amount of Cu2+ adsorbed by each NDOM-amended soil sample first increased and then decreased with an increase in ionic strength(maximum at 0.1 mol·L-1), and continued to increase with an increase in pH. With the increased aging time, the exchangeable and carbonate form Cu2+ content in the NDOM-amended soil decreased, whereas the iron-manganese oxide bound form and organic bound form Cu2+ content increased. Overall, Cu2+ mobility in each NDOM-amended soil sample was lower than that of the original soil. Sludge NDOM enhanced Cu2+ adsorption in the riverbank soil. The higher the soil temperature and pH, the longer the Cu2+ aging time, and the better the Cu2+ adsorption and blocking effect on the NDOM-amended soil. |
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