Effect of Pyrolysis Temperature on PhysicoChemical Properties and Acoustic-Based Amination of Biochar for Efficient CO2 Adsorption
Effect of Pyrolysis Temperature on PhysicoChemical Properties and Acoustic-Based Amination of Biochar for Efficient CO2 Adsorption
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DOI：
10.3389/fenrg.2020.00085
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发表时间：
2020-05-28
影响因子：
3.4
通讯作者：
Dorris, Austin
中科院分区：
文献类型：
--
作者：
Chatterjee, Riya;Sajjadi, Baharak;Dorris, Austin
本研究考察了热解温度对生物炭的物理化学性质、活化过程和碳捕获的影响。以草本植物(芒草和柳枝草)和农用工业原料(玉米秸秆和甘蔗渣)为原料，在500℃、600℃、700℃和800℃四种不同的热解温度下合成了两种不同类型的生物炭。合成的生物炭经过了声胺化活化，包括低频声学处理和胺官能化，以制备用于CO(2)捕获的吸附剂。600℃和700℃下制备的声胺化样品的CO2捕集能力提高幅度最大(200%)(对芒属植物的改善最大)，而500℃和800℃下合成的生物炭的吸附容量增幅相对较小，分别为115-151%和127-159%，而600℃和700℃的热解温度升高，导致%C和%灰分含量增加，%N含量降低，微比表面积和孔容增加。因此，芒草在600℃和700℃时具有较好的吸附能力是由于其大的比表面积(303-325m(2)/g)、高的碳含量(82-84%)和低的灰分含量(4-5%)，以及声胺化后的%N含量是生焦的两倍。
The present study examined the effect of pyrolysis temperature on the physicochemical properties of biochar, activation process and carbon capture. Two different categories of biochars were synthesized from herbaceous (miscanthus and switchgrass) and agro-industrial (corn stover and sugarcane bagasse) feedstock under four different pyrolysis temperatures -500, 600, 700, and 800 degrees C. The synthesized biochars underwent sono-amination activation comprising low-frequency acoustic treatment followed by amine functionalization to prepare adsorbents for CO(2)capture. The highest increment (200%) of CO(2)capture capacity was observed for sono-aminated samples prepared at 600 and 700 degrees C (maximum improvement for miscanthus), while biochars synthesized at 500 and 800 degrees C demonstrated comparatively lesser increment in adsorption capacities that falls in the range of 115-151 and 127-159%, respectively compared to 600 and 700 degrees C. The elevated pyrolysis temperature (particularly 600 and 700 degrees C) resulted in increased %C and %ash contents and reduced %N contents with enhancement of micro surface area and pore volume. Thus, the superior adsorption capacity of miscanthus (at 600 and 700 degrees C) can be attributed to their large surface areas (303-325 m(2)/g), high carbon contents (82-84%), and low ash contents (4-5%), as well as %N contents after sono-amination that was twice that of raw char.