秸秆生物质炭的制备及吸附性能研究

将麦秆、向日葵秆和玉米秆低温热解制备生物质炭。采用傅里叶红外光谱、X射线衍射等仪器对其结构进行了表征。研究了热解温度、溶液p H值、初始浓度、吸附时间以及吸附剂用量等因素对各生物质炭吸附亚甲基蓝效果的影响。实验结果表明,3种生物质炭均含有多孔的微晶炭,表面存在大量的活性-OH,-COOH等基团,对亚甲基蓝有较强的吸附作用;在最佳吸附条件下,玉米秆炭、向日葵秆炭以及麦秆炭对亚甲基蓝的吸附容量分别为26.6,26.2,14.7 mg/g。

Study on the Preparation and Adsorption Prosperities of Biochar From Crop Straws

Biochar is prepared from wheat -straw ,sunflower-straw and corn -straw with low temperature pyrolysis ,in which its structure is characterized by Fourier transform infrared and X -ray powder diffraction .Adsorption of methylene blue by these biochars is investigated under different experimental conditions ,such as temperature of pyrolysis ,pH ,time and the initial concentration of methylene blue .The results show that these biochars all contains porous microcrystalline car-bon ,there exist lots of active -OH and-COOH groups in the surface and they have high adsorption capacity for methylene blue .Under the optimum condition of adsorption ,the maximum adsorption capacity of methylene blue is 26 .6 ,26 .2 ,14 .7 mg/g for corn-straw char ,sunflower-straw char and wheat-straw char respectively .