Analysis of Decayed Wood by Fungi with X-Ray Diffractometry and Fourier Transform Infrared Spectroscopy
LIN Jian,ZHAO Guang-jie*,MENG Ling-xuan, LI Zhi-ping
College of Material Science and Technology, Engineering Research Centre of Forestry Biomass Materials & Energy of Ministry of Education, Beijing Forestry University, Beijing 100083, China
Abstract：In order to make clear the changes in the micro crystal structures of celluloses and the functional group of main components including cellulose, hemicelluloses and lignin in wood decayed by fungi, the crystallinity, layer spacing d in crystalline unit cell, width of crystallite and functional group of main components of Populus tomentosa Carr wood, which was decayed by Phanerochaete Chysosporium (white-rot) and Postia Placenta (brown-rot) with various durations，for two weeks, four weeks, six weeks, eight weeks and ten weeks, respectively, were investigated by means of X-ray diffraction and FTIR spectroscopy methods. It was concluded that the lattice structures of crystallite in wood cellulose were not destroyed by PC and PP, and the two theta angles and layer spacing d in crystallite were constant, although the decaying treatment times were different for each other when decayed by the same fungi. However, the crystallinity and width of crystallite decreased with the decaying treatment times increasing, and the decaying effects by PP were more significantly than those by PC, which showed that the damage extent of celluloses decayed by PP was greater than that by PC. It was estimated that the xylan in hemicelluloses had been degraded to various extents with the process of decaying in wood, resulting in the carbonyl content increasing, and the effects of degradation on hemicelluloses and celluloses by PC and PP were almost the same. Furthermore, benzene rings in lignin, which had no remarkable changes by PP, were oxidized into chain hydrocarbon after decaying by PC.
[1] Kiguchi M, Yamamoto K. Mokuzai Gakkaishi, 1992, 38(2): 150. [2] Dahlgren S E, Hartford W H. Holzforschung, 1975, 29(3): 84. [3] Kumar S. Wood and Fiber Science, 1994, 26(2): 270. [4] Welzbacher C R, Rapp A O. Cardiff, Wales, UK, Doc. No: IRG/WP02-40229. [5] Torgovnikov G, Vinden P. Kona, Hawaii, U.S.A., Doc. No: IRG/WP00-40181. [6] CAO Jin-zhen(曹金珍), Pascal Kamdem D. Journal of Beijing Forestry University(北京林业大学学报), 2006, 28(4): 1. [7] LI Jian, YANG Dong-mei, SU Wen-qiang(李 坚，杨冬梅，苏文强). Chemistry and Industry of Forest Products(林产化学与工业), 2007, 27(5): 49. [8] YANG Zhong, REN Hai-qing, JIANG Ze-hui(杨 忠，任海青，江泽慧). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2008, 28(4): 793. [9] Hodge G R, Woodbridge W C. Journal of Near Infrared Spectroscopy, 2004, 12(6): 381. [10] Yamada T, YEH T F, CHANG H M, et al. Holzforschung, 2006, 60(1): 24. [11] Hoffmeyer P, Pedersen J G. Holz als Roh-und Werkstoff, 1995, 53: 165. [12] State Bureau of Technical Supervision(国家技术监督局). Method of Sample Tree Collection for Physical and Mechanical Tests of Wood(木材物理力学试材采集方法)(GB 1927—91). Beijing: Standards Press of China(北京: 中国标准出版社), 1992. [13] FU Yun-lin, ZHAO Guang-jie, et al(符韵林，赵广杰，等). Acta Materiae Compositae Sinica(复合材料学报), 2006, 23(4): 52. [14] LIU Yue-hui, LIU Ping-an(刘粤惠，刘平安). Theory and Application of X-Day Diffraction Analysis(X射线衍射分析原理与应用). Beijing: Chemical Industry Press(北京: 化学工业出版社), 2003. [15] LIU Gang, LU Ke, LIANG Zhi-de(刘 刚，卢 柯，梁志德). Acta Physica Sinica(物理学报), 2000, 49(8): 1520. [16] LI Yu-dong, CAO Jin-zhen, TIAN Zhen-kun(李玉栋，曹金珍，田振昆). A Guide to the Uses of Treated Wood(防腐木材应用指南). Beijing: China Building Industry Press(北京: 中国建筑工业出版社), 2007.
