1. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China 2. College of Environmental Sciences and Engineering, Yangzhou University, Yangzhou 225009, China
Abstract：In the present work, the iron oxyhydroxides were prepared by hydrolysis and neutralization of ferric ion from FeCl3, Fe(NO3)3 and Fe2(SO4)3 salts, under the conditions of various pH values and aging for about 6 days at 60 ℃. These iron minerals were identified and characterized using X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscopy (SEM). In addition, particle size distributions of FeOOH suspension were also determined by LS-230 model laser grainsize analyzer. Results showed that ferrihydrite formed in the ferric solutions containing Cl-, NO-3 and SO2-4 at pH values of 8 and 10. It was testified that the presence of Cl- was favorable for the formation of akaganéite. Meanwhile, the poor crystalline goethite phase was observed to be formed in FeCl3 or Fe(NO3)3 solution, but not be formed in Fe2(SO4)3 solution at pH 12. It indicated that the presence of SO2-4 obviously inhibited the formation of goethite. However, the goethite phase formed in Fe2(SO4)3 solution with addition of ferrous ion, indicating that ferrous ion could promote the formation of goethite in SO2-4-rich solution. In addition, it was usually easy for the crystalline goethite to be transformed from the above generated ferrihydrite precipitates by aging at 60 ℃. Furthermore, the phase of akaganéite also was obtained in the Cl--rich acid (pH≤5) solution by aging at 60 ℃. In conclusion, the prepared FeOOH samples show some differences in their properties such as the phase, surface properties, morphology structures and particle size.
[1] Sharma Y C. Colloids Surf. A-Physiochem. Eng. Aspects, 2003, 215: 155. [2] Kowalski Z. J. Hazard. Mater., 1994, 37: 137. [3] Lehmann M, Zouboulis A I, Matis K A. Chemosphere, 1999, 39(6): 881. [4] Tzou Y M, Wang M K, Loeppert R H. Arch. Environ. Contam. Toxicol., 2003, 44: 445. [5] Lazaridis N K, Charalambous C. Water Res., 2005, 39: 4385. [6] ZHU Chun-shui, SUN Zhen-ya, GONG Wen-qi, et al(祝春水, 孙振亚, 龚文琪, 等). Research of Environmental Science(环境科学研究), 2003, 16(6): 57. [7] PENG Shu-chuan, LI Hui-fu, CHEN Tian-hu, et al(彭书传, 李辉夫, 陈天虎, 等). Acta Mineralogica Sinica(矿物学报), 2007, 27(2): 103. [8] CHEN Fu-xing, ZHOU Li-xiang(陈福星, 周立祥). China Environmental Science(中国环境科学), 2006, 26(1): 11. [9] ZHOU Shun-gui, ZHOU Li-xiang, CHEN fu-xing(周顺桂, 周立祥, 陈福星). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2007, 27(2): 367. [10] Abdel-Samad H, Watson P R. Appl. Surf. Sci., 1997, 108: 371. [11] Taylor R W, Shen S Y, Bleam W F, et al. Clays Clay Minerals, 2000, 48(6): 648. [12] Cornell R M, Schwertmann U. Iron Oxides in the Laboratory. New York: VCH Publishers, 1991. [13] Lehmann M, Zouboulis A I, Matis K A. Environ. Pollut., 2001, 113: 121. [14] Lazaridis N K, Bakoyannakis D N, Deliyanni E A. Chemosphere, 2005, 58: 65. [15] Tzou Y M, Wang M K, Loeppert R H. Soil Sediment Contam., 2003, 12(1): 69. [16] SUN Zhen-ya, ZHU Chun-shui, CHEN He-sheng, et al(孙振亚, 祝春水, 陈和生, 等). Acta Petrologica et Mineralogica(岩石矿物学杂志), 2003, 22(4): 352. [17] WEI Jun-feng, WU Da-qing(魏俊峰, 吴大清). Advances in Earth Science(地球科学进展), 2000, 15(1): 90. [18] LIAO Li-bing(廖立兵), Dnal dG Fraser. Earth Science: Journal of China University of Geosciences(地球科学: 中国地质大学学报), 2002, 27(5): 584. [19] Chitrakar R, Tezuka S, Sonoda A, et al. Journal of Colloid Interface and Science, 2006, 298: 602. [20] Johnson B B. Environmental Science and Technology, 1990, 24(1): 112. [21] JCPDS (Joint Committee on Powder Diffraction Standards), Mineral Powder Diffraction Files. International Center for Diffraction Data, Swarthmore: Pennsyvania. 2002. [22] ZHOU Shun-gui, ZHOU Li-xiang(周顺桂, 周立祥). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2006, 26(15): 966. [23] Randall S R, Sherman D M, Ragnarsdottir K V, et al. Geochimica et Cosmochimica Acta, 1999, 63: 2971. [24] Murad E, Bishop J L. American Mineralogist, 2000, 85, 716.
