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
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.
范春辉1，高雅琳1，张颖超2，常 敏1 . 外加阴离子吸附剂对复合污染黄土淋洗过程养分淋失的减缓机制(Ⅱ) [J]. 光谱学与光谱分析, 2016, 36(04): 1205-1210.
FAN Chun-hui1, GAO Ya-lin1, ZHANG Ying-chao2, CHANG Min1 . 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) . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(04): 1205-1210.
[1] Krumins J A, Goodey N M, Gallagher F. Soil Biology & Biochemistry, 2015, 80: 224. [2] Niu L L, Xu Y, Xu C, et al. Environmental Pollution, 2014, 195: 16. [3] Yeung A T, Gu Y Y. Journal of Hazardous Materials, 2011, 195: 11. [4] Dermont G, Bergeron M, Mercier G, et al. Journal of Hazardous Materials, 2008, 152: 1. [5] FAN Chun-hui, ZHANG Ying-chao, MA Hong-rui, et al(范春辉, 张颖超, 马宏瑞, 等). Journal of Analytical Science(分析科学学报), 2014, 30: 5. [6] FAN Chun-hui, ZHANG Ying-chao, CAI Shao-yuan, et al(范春辉, 张颖超, 蔡少渊, 等). Journal of Safety & Environment(安全与环境学报), 2013, 13: 63. [7] FAN Chun-hui, ZHANG Ying-chao, WANG Xiao-na, et al(范春辉, 张颖超, 王晓娜, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2014, 34(4): 1035. [8] BAO Shi-dan(鲍士旦). Analysis on Soil & Agricultural Chemistry(土壤农化分析). 3rd Edition(第3版). Beijing: China Agriculture Press(北京: 中国农业出版社), 2000. [9] Noroozifar M, Khorasani-Motlagh M, Naderpour H. Microporous & Mesoporous Materials, 2014, 197: 101. [10] Bera A, Kumar T, Ojha K, et al. Applied Surface Science, 2013, 284: 87. [11] Rudzinski W, Borowiecki T, Panczyk T, et al. Advances in Colloid & Interface Science, 2000, 84: 1. [12] Fainerman V B, Lucassen-Reynders E H. Advances in Colloid & Interface Science, 2002, 96: 295. [13] Moradi O, Fakhri A, Adami S, et al. Journal of Colloid & Interface Science, 2013, 395: 224. [14] Arai Y, Sparks D L. Journal of Colloid & Interface Science, 2001, 241: 317.
