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| 热解温度对生物炭表面性质及释放氮磷的影响 |
| Effects of Biochar Pyrolysis Temperature on Its Surface Characteristics and Nitrogen and Phosphorus Release |
| 投稿时间：2015-10-27 |
| DOI：10.13254/j.jare.2015.0256 |
| 中文关键词: 生物炭 解热温度 表面性质 氮磷释放 |
| 英文关键词: biochar pyrolysis temperature surface characteristics nitrogen and phosphorus release |
| 基金项目:湖北汉库汇水流域水质安全保障关键技术研究与示范项目(2012ZX07205002-02-02) |
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| 中文摘要: |
| 热解温度是影响生物炭表面性质的重要因素。在250~450℃范围内制备玉米秸秆生物炭(CB)和杨木生物炭(PB)。采用X-射线光电子能谱仪对生物炭的表面元素进行分析,发现各元素含量随热解温度而变化,2种生物炭的变化规律不同。傅里叶变换红外分析表明,热解温度升高造成生物炭基团的变化,C=O基团增多,芳香性增强。研究生物炭在水中的氮磷释放行为发现,随着热解温度的升高,NH4+-N和NO3--N的释放呈现先增加后减少的趋势;CB的总磷释放有所增加,PB的总磷释放先增加后降低。不同热解温度的生物炭,其营养元素的释放速率在初期存在一定差别,释放过程在48 h内基本完成。生物炭的表面性质及氮磷释放行为与热解温度及生物质来源密切相关。 |
| 英文摘要: |
| To investigate the effects of biochar pyrolysis temperature on its surface characteristics and nitrogen and phosphorus release, cornstalk-based biochar(CB) and poplar-based biochar(PB) were produced at a temperature range of 250~450℃. The surface elemental and group composition of biochars were analyzed using X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectrometer(FTIR). The results showed that the contents of various elements varied with the pyrolysis temperature, but the trends were different for the two biochars. The groups of biochar changed with a rise in pyrolysis temperature. The C=O groups were increased and the aromaticity was enhanced. With the rise of pyrolysis temperature, the release of NH4+-N and NO3--N firstly increased and then decreased. The release of total phosphorus increased to some extent for CB, while it increased firstly and then decreased for PB. The release kinetics of nutrient elements varied to some extent for biochars pyrolyzed at various temperatures. The release process was almost completed in 48 h. The surface characteristics and nitrogen and phosphorus release behavior of biochars were closely related to the pyrolysis temperature and biomass source. |
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