以纯水、磷酸、柠檬酸、乙酸和硫酸溶液为水热介质,研究酸介质下秸秆微波水热炭的理化和吸附性能。结果表明,酸介质的加入可降低秸秆水热炭产率,且磷酸介质下的水热炭产率最高,为44.25%~47.24%。酸介质水热炭的C、灰分和固定碳增加,H/C和O/C降低,而其C==O、C==C和芳香C—H键能增强。磷酸介质下水热炭的孔隙发达和碳微球较多,其次是柠檬酸介质。磷酸介质下水热炭的比表面积和总孔体积最高,分别为10.669~15.506 m2/g和0.070~0.116 cm3/g。酸介质水热炭的氨氮吸附量明显增加,磷酸介质水热炭的氨氮吸附量最高,达到5.26 mg/g,水热炭的灰分、固定碳、C含量、N含量、O含量、比表面积、总孔体积和孔径对氨氮吸附具有正向的特征贡献。
Abstract
The physicochemicaland adsorption characteristics of themicrowave hydrocharswere discussed by using pure water,phosphoric acid,citric acid,acetic acid and sulfuric acid solutions as the hydrothermal reaction media.The results showed that the addition ofacid media reduced the yield of hydrochar. The addition of phosphoric acid solution medium resulted in the highest yield of hydrochar,which was 44.25%-47.24%. Compared to that preparedin pure water medium, the C, ash and fixed carbon of hydrochar prepared in acid media were higher,while the H/C and O/C were lower. The application of acid mediaenhanced the C==O,C==C and aromatic C—H bonds in the hydrochar. The hydrochars prepared in the phosphoric acid medium had the most abundant pore structures and carbon microspheres, followed by those prepared in the citric acid medium. The phosphoric acid medium resulted in the largest specific surface area of 10.669-15.506 m2/g and the largest total pore volume of 0.070-0.116 cm3/g of the hydrochar.The hydrochars prepared in acid media had a significant increase in the adsorption amount of ammonia nitrogen,and those prepared in phosphoric acid medium had the highest adsorption amount of ammonia nitrogen of 5.26 mg/g. The contents of ash,fixed carbon, C,N and O of hydrochars had a positive impact on the adsorption of ammonia nitrogen, meanwhile,the adsorption of ammonia nitrogen were also positively correlated with the specific surface area, total pore volumeand aperture size of the hydrochar.
关键词
生物质能 /
酸 /
水热炭 /
吸附 /
理化特性 /
秸秆 /
微波水热炭化
Key words
biomass energy /
acid /
hydrochar /
adsorption /
physicochemical properties /
straw /
microwave hydrothermal carbonization
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基金
湖北省自然科学基金面上项目（2021CFB611）; 中央高校基本科研业务费专项（2662020GXPY013）
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