Study on the Co-Adsorption Mechanism of Pb(Ⅱ) and Chlorpyrifos on Arid Loess in Northwestern China
FAN Chun-hui1, ZHANG Ying-chao2, WANG Jia-hong1
1. College of Resource and Environment, Shaanxi University of Science & Technology, Xi’an 710021, China 2. College of Environment, Tsinghua University, Beijing 100084, China
Abstract：The co-adsorption characteristics of Pb(Ⅱ) and chlorpyrifos on arid loess were investigated with batch adsorption procedures, and the co-adsorption mechanism was studied with approaches of SEM, FT-IR, XRD and theoretical analysis. The experimental results indicated that the adsorption process of Pb(Ⅱ) and chlorpyrifos on loess fit better the Langmuir isotherm, the maximum adsorption capacity of qm is 12.5 and 0.64 mg·g-1 for Pb(Ⅱ) and chlorpyrifos on loess, respectively, and the reaction could be illustrated with pseudo-second order kinetic equation. The SEM micrograph of loess surface varies little after the adsorption process of Pb(Ⅱ) and chlorpyrifos, and certain wave peaks of FTIR spectra red-shift, disappears or intensity-decrease, with the XRD pattern and theoretical analysis, the adsorption mechanism is described as follows: the adsorption of Pb(Ⅱ) on arid loess is the chemical-effect of coordination-complexation and Van der Waals force; the physical-adsorption on chlorpyrifos involves the interception function, hydrogen bonds and Van der Waals force, and chemical adsorption effect to some extent. The organic matter in arid loess plays an important role in Pb(Ⅱ) and chlorpyrifos adsorption.
范春辉1，张颖超2，王家宏1 . 西北旱田黄土对Pb(Ⅱ)和氯吡硫磷复合污染的共吸附机制研究 [J]. 光谱学与光谱分析, 2013, 33(08): 2137-2142.
FAN Chun-hui1, ZHANG Ying-chao2, WANG Jia-hong1 . Study on the Co-Adsorption Mechanism of Pb(Ⅱ) and Chlorpyrifos on Arid Loess in Northwestern China . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(08): 2137-2142.
[1] James B, Martin H, David T J, et al. Environ. Sci. Technol.，2011, 45(1): 104. [2] Chiou C T, Paul E P, David W S. Environ. Sci. Technol.，1983, 17(4): 227. [3] WU Ping-xiao, LIAO Zong-wen(吴平霄, 廖宗文). Adv. Environ. Sci.(环境科学进展)，1999, 7(3), 701. [4] WANG Jin-gui, Lü Jia-long, ZHANG Rui-long, et al(王金贵, 吕家珑, 张瑞龙, 等). Journal of Agro-Environment Science(农业环境科学学报)，2012, 31(6), 1118. [5] LIU Wei-ping, WANG Qi-quan, LI Ke-bin (刘维屏, 王琪全, 李克斌). China Environ. Sci.(中国环境科学)，1998, 18(2), 102. [6] National Standard of the People’s Republic of China(中华人民共和国国家标准), GB/T17141—1997. [7] LI Jie-qiu, LI Xiao-feng, SHEN Wan-ke, et al(李界秋, 黎晓峰, 沈万科, 等). Chinese Agr. Sci. Bull.(中国农学通报)，2007, 23(1), 168. [8] YANG Zhi-qun(杨志群). Master Dissertation, Lanzhou University, Lanzhou(硕士论文, 兰州大学, 兰州), 2010. [9] Ho Y S. J. Hazard. Mater.，2006, B136(3): 681. [10] Akhtar M, Bhanger M I, Iqbal S, et al. J. Hazard. Mater.，2006, 128(1/2/3): 44. [11] Xing B S, Pignatello J. Environ. Sci. Technol.，1997, 31(2)：792. [12] Pingnatello J J, Xing B S. Environ. Sci. Technol.，1996, 30(1): 1. [13] Xu D, Wang X K, Chen C L, et al. Radiochim. Acta，2006, 94(8)：429. [14] Chiou J R, Weber W J, Huang W L. Environ. Sci. Technol.，1996, 31(3)：881. [15] Senesi N, D’Orazio V, Ricca G. Geoderma, 2003, 116(3-4)：325. [16] Baes A U, Bloom P R. Soil Sci. Soc. Am. J，1989, 53(3)：695. [17] TAN Wen-feng, LIU Yong-hong, LI Xue-yuan, et al(谭文峰, 刘永红, 李学垣, 等). Acta Pedologica Sin.(土壤学报)，2004, 41(6)：976. [18] ZHAO Li-yan, WANG Xue-kai, GUO Yu-guo, et al(赵立艳, 王学恺, 郭玉国, 等). Acta Phys. -Chim. Sin.(物理化学学报)，2003, 19(10)：896. [19] Chiou C T, Thomas D S. Environ. Sci. Technol.，1985, 19(12)：1196. [20] Khan S U, Can J. Soil Sci.，1973, 53(2)：199. [21] Pei Z G, Shan X Q, Wen B, et al. Environ. Pollut.，2006, 139(3)：541.
