炉渣与小麦秸秆共热解生物炭吸附污染物性能

Adsorption Performance of Pollutants by Biochar from Co-Pyrolysis of Slag and Wheat Straw

摘要: 为实现固废资源化，以生物质电厂废弃物和小麦秸秆为原材料，分别在600℃、900℃下共热解制备了一系列生物炭。通过孔径与比表面积分析仪对生物炭理化性质进行了表征，研究了共热解生物炭对CO₂、甲基橙、亚甲基蓝的吸附性能。结果表明：由于含有相对较少的无机灰分，炉渣较飞灰有更大的比表面积。共热解生物炭的制备温度和炉渣与秸秆的质量比均会影响其理化性质，秸秆含量和热解温度越高，生物炭孔隙越发达；生物炭比表面积与CO₂吸附量存在线性相关，比表面积越大CO₂吸附量也越大。然而，在亚甲基蓝和甲基橙的吸附中，炉渣所含的大量无机物发挥了重要吸附作用，炉渣含量越高所吸附的染料越多。

Abstract: In order to recycle the solid waste, a series of biochar was prepared by co-pyrolysis of wheat straw and waste from biomass power plant at 600˚C and 900˚C, respectively. The physical and chemical properties of biochars were characterized by pore size and specific surface area analyzer, and the adsorption properties of CO₂, methyl orange and methylene blue on co-pyrolytic biochars were studied. The results show that slag had a larger specific surface area than fly ash for its less inorganic ash content. The preparation temperature of co-pyrolytic biochar and the mass ratio of slag to straw affected the biochar’s physical and chemical properties, and the higher of straw content and pyrolysis temperature, the more developed pores of biochar. There was a linear correlation between the specific surface area and CO₂ adsorption capacity of biochar, and the larger the specific surface area the greater the CO₂ adsorption capacity. However, it was on the contrary for the methylene blue and methyl orange adsorption, the higher the slag content the more dyes would be adsorbed for the inorganic ash of slag plays an important role in the adsorption.