Abstract:This study mainly focused on the adsorption properties and adsorption mechanism of 2,4-D on two different humic acids. After the extraction of humic acid from the two different types of soil, the black soil and chestnut soil, adsorption experiments were carried out using the batch equilibrium techniques. Then FTIR and ESR spectral analysis methods were employed to explain the functional mechanism between 2,4-D and humic acid. The results showed the relationship between the amount of 2,4-D sorbed by the two humic acids and the reaction time, with the adsorption process for both acids being very fast at the beginning, then becoming slower and finally reaching equilibrium. The adsorption capacity of 2,4-D on black soil humic acid and chestnut soil humic acid were 0.39 and 0.42 mg·kg-1 respectively. More carboxylic acid structure made the initial adsorption rate of 2,4-D on black soil humic acid much faster than on chestnut soil humic acid. Adsorption isotherm of 2,4-D on the two humic acids was both in accordance with the linear model and the Freundlich model. The interactions between humic acid and 2,4-D are mostly weak forces, such as the H-bond, proton transfer, charge transfer, van der Waals force and so on. In addition, ESR analysis found that covalent bond exists between humic acid and 2,4-D or its degradation product during the process of adsorption.
常春英,吕贻忠*. 两种胡敏酸对2,4-D的吸附特性及机理研究[J]. 光谱学与光谱分析, 2009, 29(11): 2926-2929.
CHANG Chun-ying,Lü Yi-zhong*. Adsorption Characteristics and Mechanism of 2,4-D on Two Types of Humic Acid. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(11): 2926-2929.
[1] Stevenson F J. Humus Chemistry(腐殖质化学). Translated by XIA Rong-ji(夏荣基,译). Beijing: Beijing Agricultural University Press(北京: 北京农业大学出版社), 1994. [2] XU Xiao-bai(徐晓白). Environmental Behavior of Toxic Organic and Eco-Toxicity Theory Collection(有毒有机物环境行为和生态毒理论文集). Beijing: Science and Technology of China Press(北京: 中国科学技术出版社), 1990. 103. [3] Benoit P, Barriuso E, Calvet R. Chemosphere,1998, 37(7): 1271. [4] CAO Gang, MO Han-hong, et al(曹 罡, 莫汉宏, 等). Acta Scientiae Circumstantiae(环境科学学报),2002, 22(1): 120. [5] Senesi N. Science of the Total Environment,1992, 123-124: 63. [6] Boivin A, Amellal S, Schiavon M, et al. Environmental Pollution, 2005, 138(1): 92. [7] Khan S U. Humic Substances in the Environment(环境中的腐殖物质). Translated by WU Qi-hu(吴奇虎,译). Beijing: Science Press(北京: 科学出版社), 1979. [8] LIU Wei-ping(刘维屏). Pesticide Environmental Chemistry(农药环境化学). Beijing: Chemical Industry Press(北京: 化学工业出版社), 2006. 134. [9] ZHAO Zhen-guo(赵振国). Principle of Adsorption Application(吸附作用应用原理). Beijing: Chemical Industry Press(北京: 化学工业出版社), 2005. 190. [10] LIU Wei-ping, LI Ke-bin(刘维屏, 李克斌). China Environmental Science(中国环境科学), 1998, 18(2): 102. [11] FANG Zhao-lun(方肇伦). Instrument Analysis in Soil Science and Biology(仪器分析在土壤学和生物学中的应用). Beijing: Science Press(北京: 科学出版社), 1983. 61. [12] WANG Hai-zhen, XU Jian-min, XIE Zheng-miao(汪海珍, 徐建民, 谢正苗). Ecology and Environment(生态环境), 2003, 12(2): 208. [13] GU Zhi-mang, HU Cheng(顾志忙, 胡 澄). Chinese Journal of Analytical Chemistry(分析化学), 2000, 28(3): 314. [14] Senesi N, Testini C,Miano T M. Organic Geochemistry, 1987, 11(1): 25. [15] Senesi N,Testini C. Pestic Sci., 1983, 14: 79. [16] Tan K H. Humic Matter in Soil and the Environment. New York: Marcel Dekker, Inc., 2003. 180. [17] Senesi N. Science of the total Environment,1992, 123-124: 63. [18] Senesi N, Testini C. Soil Science,1980, 130(6): 314. [19] Arkhipova M B, Tereshchenko L K, Arkhipov Y M. Russ. J. Appl. Chem., 1997, 70: 1930.