Thermodynamic characteristics and mechanisms of heavy metals adsorbed onto urban soil

Abstract

The thermodynamic characteristics of heavy metals adsorbed onto urban soil and the relative adsorption mechanisms were studied by the batch experiment. The results show that there existed dynamic adsorption-desorption equilibrium processes of cationic and anionic ions of heavy metals onto urban soil, which may have an impact on the pH of the adsorption system. The amounts of heavy metals adsorbed onto urban soil increased with the increase of the equilibrium concentration, but their adsorption amounts were not the maximum adsorption amounts. The higher the pH was, the greater the adsorption capacity of the urban soil at the same equilibrium concentration was, and the adsorption amounts of heavy metals onto urban soil followed the order of Pb>Cu>Cd>Zn>Ni. There were coordination reaction, hydrolysis reaction, exchange reaction in the adsorption processes of heavy metals onto urban soil. With the increase of pH, the influencing degree of pH on the different reactions of heavy metals in the soil increased, meanwhile the effects of other physicochemical properties of soil on the adsorption of heavy metals were weakened.

Keywords

Urban soil / Heavy metal / Adsorption / pH

References

[1] Bockheim J. G., Nature and Properties of Highly-disturbed Urban Soil, Annual Meeting of the Soil Society of America, Chicago, 1974

[2] Zhang G. L., Zhu Y. G., Fu B. J. Acta Ecologica. Sinica, 2003, 2(3): 539.

[3] Zhang J. E., Xu Q. Soil, 1997, 4: 189.

[4] Zhang G. L., Zhao Y. G., Yang J. L., Zhao W. J., Gong Z. T. Acta Pedologica. Sinica, 2007, 44(5): 925.

[5] Díaz R. O., Hernández M. M., Echeverrá C. F., Arado L. J. O. Bul. Environ. Contam. Tox., 2011, 87(4): 414.

[6] Zhang J. M., Chi F. Q., Su Q. R., Kuang E. J. Journal of Northeast Agricultural University, 2010, 41(7): 56.

[7] Khan S., Khan M. A., Rehman S. Pedosphere, 2011, 21(3): 351.

[8] Luo X. S., Yu S., Li X. D. Environ. Pollut., 2011, 159(5): 1317.

[9] Iqbal J., Shah M. H. J. Hazard. Mater., 2011, 192(2): 887.

[10] Wang Y. Y., Qian Y., Zhu J. W., Wang L. Journal of Anhui Agricultural Science, 2008, 36(11): 4680.

[11] Nanjing Soil Research Institute of Chinese Academy of Sciences. Soil Physical and Chemical Analysis, 1983, Shanghai: Shanghai Science and Technology Press.

[12] Hua X. Y., Dong D. M., Jiang X., Hu J. R., Guo Z. Y., Liang D. P. Chem. J. Chinese Universities, 2012, 33(9): 2005.

[13] Liu X. L., Zhang S. Z., Wu W. Y., Liu H. L. J. Hazard. Mater., 2007, 149(2): 399.

[14] Ottosen L. M., Hansen H. K., Jensen P. E. Water, Air and Soil Pollution, 2009, 201(l): 295.

[15] Malandrino M., Abollino O., Giaeomino A., Aeeto M. J. Colloid. Interf. Sci., 2006, 299(2): 537.

[16] Mustafa G., Singh B., Kookana R. S. Chemosphere, 2004, 57(10): 1325.

[17] Karathanasis A. D., Pils J. Soil and Sediment Contamination, 2005, 14(4): 293.

[18] Guo P. R., Wang C., Fang J., Mou D. H., Qiu R. L., Wang Z. H. J. Insturn. Anal, 2009, 28(12): 1384.

[19] Brümmer G. W. Bernhard M., Brinckman F. E., Sadler P. J. The Importance of Chemical Speciation in Environmental Processes, 1986, Berlin: Springer-verlag 169.

[20] Stumm W., Morgan J. J. Aquatic Chemistry, 1981, New York: John Wiley & Son. Inc. 789.

[21] Temminghoff E. J. M., vander Zee S. E. A. T. M., de Haan F. A. M. Eur. J. Soil. Sci., 1995, 46: 649.

[22] Anderson M. A., Morel M. M. Limnol. Oceanogr., 1982, 27: 789.

[23] Tiller K. G., Gerth J., Brummer G. Geoderma, 1984, 34: 17.

[24] He H. P., Guo J. G., Xie X. D., Pen J. L. Acta Mineralogica Sinica, 1999, 19(2): 231.

[25] Xiong L. M. Research of Environmental Science., 1994, 7(1): 35.

[26] Xu M. G. Soil and Fertilizer, 1997, 5: 3.

[27] Santillan-Medrano M. J., Jurina J. J. Soil. Sci. Soc. Am. Pro, 1975, 39: 851.