| 光谱学与光谱分析 |
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| Study on the Mechanism to Ease the Leaching Effect of Nutrient in the Multi-Contaminated Loess Washing Process with the Addition of Anion Adsorbent(Ⅱ) |
| FAN Chun-hui1, GAO Ya-lin1, ZHANG Ying-chao2, CHANG Min1 |
1. School of Resource & Environment, Shaanxi University of Science & Technology, Xi’an 710021, China
2. School of Environment, Tsinghua University, Beijing 100084, China |
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Abstract The soil washing technology is commonly used to remediate contaminated soils because of its advantages of low cost, ease handling and environmental-friendly. However, it should be noticed that the nutrient might leach simultaneously from soil in the washing process, and the technical solution of the issue will greatly accelerate the application process of washing technology in site remediation. This paper aims to reveal the regulating mechanism of synthesized anion adsorbent from straw on nutrient leaching potential through approaches of adsorption equilibrium models (isotherms and kinetics) and spectral analysis instruments (SEM and FTIR). The results showed: the Langmuir isotherm and pseudo second order kinetic equation fit better the adsorption behavior of nitrate and phosphate. The maximum adsorption capacity (qm), calculated with Langmuir isotherm, are 7.507 5 and 4.194 6 mg·g-1, respectively, and the reaction belongs to the monolayer and favorable adsorption with chemical adsorption the rate-determining step. The activation energy of adsorption for nitrate and phosphate at 298 K are 42.25 and 39.38 kJ·mol-1, respectively, and the reaction is spontaneous and endothermic. The purified water and KOH solution are effective for the regeneration of anion adsorbent, the desorption effect is better for the assistance of ultrasonic sound and longer desorption time. The surface of anion adsorbent after adsorption is covered with particles, while less spray-like component appears after desorption with purified water. The movement of vibration peaks in FTIR spectra indicates the effect of electrostatic interaction in the reaction. The adsorption of nitrate and phosphate on anion adsorbent involves simultaneously the effects of physical and chemical adsorption.
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Received: 2014-11-11
Accepted: 2015-02-26
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Corresponding Authors:
FAN Chun-hui
E-mail: frank_van391@163.com
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| [1] |
FAN Chun-hui1, ZHANG Ying-chao2, DU Bo1, HE Lei1, WANG Jia-hong1 . Spectrum Characteristics of Leaching Components from Co-Contaminated Loess in Ex-Situ Column Washing Reaction [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(02): 447-452. |
| [2] |
FAN Chun-hui1, ZHANG Ying-chao2, WANG Xiao-na1, WANG Jia-hong1 . Ex-Situ Remediation on Co-Contaminated Arid Loess in Column with Spectral Methods [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(04): 1035-1039. |
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