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| Stabilization remediation of cadmium contaminated soil by using heat-modified palygorskite |
| Received:September 23, 2020 |
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| KeyWord:palygorskite;heat-modified;stabilization;cadmium(Cd) ;soil |
| Author Name | Affiliation | E-mail | | TAO Ling | Institute of Environmental Ecology, School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Gansu Hanxing Environmental Protection Co., Ltd., Lanzhou 730070, China
Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730070, China | | | GUAN Tian-cheng | Institute of Environmental Ecology, School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | LIU Rui-zhen | Service Center of Yantai Forest Resources Monitoring and Protection Center, Shandong Province, Yantai 264000, China | | | HE Jing | Institute of Environmental Ecology, School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | SHANG Qian-qian | Institute of Environmental Ecology, School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | REN Jun | Institute of Environmental Ecology, School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Gansu Hanxing Environmental Protection Co., Ltd., Lanzhou 730070, China
Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730070, China | renjun@mail.lzjtu.cn |
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| Abstract: |
| In order to investigate the stabilization effect of palygorskite at different pyrolysis temperatures on cadmium(Cd) in soil, palygorskite particles were pyrolyzed at 250, 300, 350, 400℃, and 450℃ for 2.5 h. The stabilization effect of Cd contaminated soil was evaluated by a stabilization experiment and pot experiment. The results showed that the pH, electrical conductivity, and cation exchange capacity of the soil were increased by adding palygorskite at different temperatures, and the concentration of extractable Cd in DTPA and TCLP decreased significantly, When the heat-modified palygorskite at 350℃ was added to stabilize the soil, the concentration of Cd in the two extraction states decreased the most, by 39.7% and 32.6%, respectively. The addition of 350℃ heat-modified palygorskite could promote the transformation of Cd from an acid soluble state with high activity to a residual state with low activity, thus effectively reducing the mobility of Cd. Palygorskite enhanced the growth of corn plants. Compared with the control, the root length, plant height, fresh weight, and dry weight of corn plants significantly increased, and the accumulation of Cd from soil to aboveground parts and the transportation of Cd from underground to aboveground parts were significantly reduced. Therefore, heat-modified palygorskite can be used as an environmental protection material for the stabilization and remediation of heavy metal contaminated soil. |
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