Abstract:Iron oxyhydroxides (FeOOH), as an environmental mineral material, can adsorb and coprecipitate the contamination from the medium. The ability of removing contamination is decided by the morphology and structural characteristic and the synthesis methods of the obtained mineral. In the present, the used synthesis methods of iron oxyhydroxides (FeOOH) include ferric iron hydrolyzation and ferrous chemical oxidation. But the products of iron oxyhydroxides prepared by these two chemical methods are easily agglomerated and form bigger particles. Thus, in the present study, a novel gel-network precipitation method was developed to synthesize the nanoparticles of goethite (α-FeOOH) as environmental mineral material. During formation of α-FeOOH nanoparticles by this method, FeCl3 acted as the reaction material and glutin played a role of the reaction medium, which prevents the presence of agglomeration of precipitate particles. So the obtained α-FeOOH nanoparticles had smaller size, no aggregation and basic monodispersity, compared with that prepared by the coprecipitation method. At the same time, we introduced the spectrum analysis measures, and studied the effect of different concentration of glutin and FeCl3 solution on the crystallizability and morphology of products. The structure and morphology of α-FeOOH nanocrystallites were determined by means of XRD, FTIR and SEM. The results of the spectrum analysis showed that the particle sizes and shapes and crystallizability of the obtained α-FeOOH precipitate products were highly related to the network structure of gelatin. And the goethite particles with better monodispersity, prepared by the optimum concentrations of glutin (12%) and FeCl3 solution (0.6 mol·L-1), had a short rod-type shape approximately 110 nm in length with an average diameter of about 35 nm.
[1] Cornell R M, Schwetmann U. The Iron Oxides. VCH, Weinheim, 1996. [2] Prasad P S R, Prasad K S, Chaitanya V K, et al. J. Asian Earth Sci., 2006, 27: 503. [3] Karathanasis A D, Thompson Y L. Soil Sci. Soc. Am. J., 1995, 59: 1773. [4] Carlson L, Bigham J M, Schwertmann U, et al. Environ. Sci. Technol., 2002, 36: 1712. [5] 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(5): 966. [6] Villalobos M, Trotz M A, Leckie J O. Environ. Sci. Technol., 2001, 35: 3849. [7] Skovbjerg L L, Stipp S L S, Utsunomiya S, et al. Geochimica et Cosmochimica Acta, 2006, 70: 3582. [8] 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. [9] Fortin D, Langley S. Earth-Science Review, 2005, 72: 1. [10] Bakoyannakis D N, Deliyanni E A, Zouboulis A I, et al. Microporous and Mesoporous Mater., 2003, 59: 35. [11] Abdel-Samad H, Watson P R. Appl. Surf. Sci., 1997, 108: 371. [12] Taylor R W, Shen S Y, Bleam W F, et al. Clays and Clay Minerals, 2000, 48(6): 648. [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] Nesterova M, Moreau J, Banfield J F. Geochimicaet Cosmochimica Acta, 2003, 67(6): 1177. [18] Yuan Z Y, Su B L. Chem. Phys. Lett., 2003, 38(5-6): 710. [19] ZHANG Chao-ping, HU Lin, LUO Yu-ping, et al(张朝平, 胡 林, 罗玉萍, 等). Acta Materiae Compositae Sinica(复合材料学报), 2002, 19(2): 59. [20] HU Qiao-ling, CHEN Fu-ping, LI Bao-qiang, et al(胡巧玲, 陈福平, 李保强, 等). Chem. J. Chinese Univ.(高等学校化学学报), 2005, 26(10): 1960. [21] LIU Guo-guang, XIE You-hai, WANG Ying-ling, et al(刘国光, 谢友海, 汪应灵, 等). China Environ. Sci. (中国环境科学), 2006, 26(6): 713. [22] ZHOU Jian-guo, WANG Ying-ling, ZHAO Feng-ying, et al(周建国, 汪应灵, 赵凤英, 等). Chinese J. Inorg. Chem.(无机化学学报), 2005, 21(2): 221. [23] SHEN Zhong, WANG Guo-ting(沈 钟, 王果庭). Colloid and Surf. Chem.(胶体与表面化学). Beijing: Chemical Industry Press(北京: 化学工业出版社), 1997. [24] Ruan H D, Frost R L, Kloprogge J T. Spectrochimica Acta Part A, 2001, 57: 2575. [25] Randall S R, Sherman D M, Ragnarsdottir K V, et al. Geochimica et Cosmochimica Acta, 1999, 63: 2971. [26] Murad E, Bishop J L. Am. Mineralogist, 2000, 85: 716.