Study on the Change of Minerals and Molecular Structure during Biomass Washing Process

The typical aquatic plant in Poyang Lake,Reed,was uesd as the object in this experiment,and the samples were prepared by washing with water and acid. Low-temperature ashing and X-ray fluorescence( XRF) were used to analyze the ash compositions,and molecular structure was analyzed by Fourier infrared spectrum( FTIR). The results show that inorganic minerals in Reed almost is 99. 8%,in which the water-soluble salt is 12. 74%,water-indissolvable or water-insoluble salts87. 06%,and organic minerals is 0. 2%. The main minerals are Si in Reed,followed by S,K,Al,Ca,P,Mn and Fe. It is obviously that most of S,K and Ca are removed by water-washed. There are association absorption peaks in the characteristic peak area and the fingerprint area of the infrared spectrum of Reed,and there are more linear chain and single-bond branched chain. There are more oxygen-containing groups,mainly including carbonyl groups carboxyl groups,and anhydride groups,etc. N-H groups and Si-O groups are washed out during Acid washing,but acid washing is little effective to organic sulfur groups.