木质素基生物炭制备及对亚甲基蓝的吸附性能

研究温度对生物炭得率、吸附性能的影响.采用无氧慢速热解的方法,以酶解木质素为原料,制备不同温度下的生物质炭,测定热解得率、生物炭得率、挥发分、灰分及对亚甲基蓝的吸附值.热解试验结果表明:随着炭化温度从300℃逐渐升高到700℃,热解得率先降低后升高,挥发成分先升高后降低,生物炭得率先降低后升高.在500℃时,热解得率和生物炭得率分别为54.09%和50.77%,灰分含量为3.32%,挥发分含量为45.91%;热解温度为300℃时,木质素基生物炭对亚甲基蓝的吸附值最大,为37.31 mg/g;热解过程中,C—H、C=O键断裂.

Preparation of Lignin-Based Biochar and Adsorption Capability of Methylene Blue

In order to study the effect of temperature on the yield and adsorption performance of biochar, the Lignin-Based biochar at different temperatures were prepared by slow pyrolysis method. Biomass pyrolysis yield, carbon yield, volatiles, ash and methylene blue adsorption values of biochar were measured. The results of experiments showed that the pyrolysis yield and carbon yield decreased first and then increased, the volatile components first rose and then decreased with the carbonization temperature from 300℃ to 700℃. At 500℃,the yield of pyrolysis and carbon were 54. 09% and 50. 77% , respectively. Meanwhile, the ash content and the volatile content was 3. 32% and 45. 91% ,respectively. The adsorption experiments showed that the maximum adsorption of methylene blue by lignin-based biochar was 37. 31 mg/g at 300℃. The C—H and C＝O bonds had broken during the pyrolysis.