吉林大学学报（理学版）Issue(4)：802-808,7.DOI:10.13413/j.cnki.jdxblxb.2015.04.37
不同碳化温度下玉米秸秆生物炭的结构性质及其对氮磷的吸附特性
Structural Properties of Corn Straw Biochar and Characteristics of Its Adsorption for Nitrogen and Phosphate at Different Carbonization Temperature
摘要
Abstract
Corn straw biochar may be of an important role in improving soil fertility and controlling non-point source pollution of nitrogen and phosphate.Three biochars named B250,B350 and B450 were produced from corn straw biomass materials at temperatures 250,350 and 450 ℃,respectively. The characteristics of structure and surface of the biochars were measured by SEM (scanning electron microscopy)and FTIR (Fourier Transform infrared spectroscopy),and the adsorption characteristics of the biochars for nitrogen and phosphate were also investigated by laboratory simulation.The results from SEM and FTIR show that the pore deformation and the stalk roughness increased as the carbonization temperature rose,furthermore making the pore canal effect easier and the adsorption properties more excellent.Meanwhile,the biochars were of a higher degree of stability enhancement with temperature rising. The results from nitrogen and phosphate adsorption kinetics and thermodynamics on biochars show that B250 released some phosphate from itself during the adsorption process,so adsorption results of B250 is negative,while the adsorption kinetic processes of B350 and B450 were consistent with the Lagergren pseudo-second order kinetic model,and the adsorption isotherms of three biochars agreed well with the Langmuir formulae.The shortest time to reach the adsorption equilibrium is 5 h for B450,and the longest time to reach the adsorption equilibrium is 12h for B350,while adsorption capacity is in descending order of B450 >B350 >B250. In addition,the adsorption kinetic process for nitrogen is consistent with the Lagergren pseudo-second order kinetic model,the adsorption isotherms agree well with the model of Langmuir.Adsorption rate of nitrogen on the biochars is in descending order of B450 > B350 > B250,while adsorption capacity is in descending order of B450>B350>B250.关键词
吸附特性/结构特征/氮/磷/玉米秸秆生物炭Key words
adsorption characteristic/structure characteristic/nitrogen/phosphate/corn straw biochar分类
资源环境引用本文复制引用
张璐,贾丽,陆文龙,徐聪珑,张文卿,谢忠雷..不同碳化温度下玉米秸秆生物炭的结构性质及其对氮磷的吸附特性[J].吉林大学学报（理学版）,2015,(4):802-808,7.基金项目
国家水体污染控制与治理科技重大专项基金(批准号:2012ZX07208-011) （批准号:2012ZX07208-011）
