陈化处理对稻壳生物炭理化性质的影响
发布时间:2018-09-01 06:39
【摘要】:生物炭性质虽然稳定,却也并非一成不变,其理化性质会随着时间推移而发生缓慢变化,进而对其功能产生影响。为明确陈化对生物炭理化性质的影响,探明生物炭陈化机制。以稻壳生物炭为试验材料,利用PVC圆柱,在人工气候箱中通过25个周期冻融循环(30℃/10d,-25℃/10d)和淋溶模拟生物炭陈化过程,分析生物炭表观结构、元素组成、氧化程度、吸附能力、pH值、碳酸盐含量等理化性质变化。结果表明:陈化处理破坏稻壳生物炭的表观结构、增加表面孔隙且随处理周期延长破坏程度加剧。C元素含量和C/H比值在25个周期中没有显著变化,C/N比值、速效P和N含量呈先下降后平稳趋势,速效K含量由7917mg·kg~(-1)下降到917mg·kg~(-1),达极显著水平。陈化处理初期生物炭表面O/C比值迅速上升,到第7个周期后开始下降,到15个周期后趋于平稳,说明陈化处理初期稻壳生物炭表面氧化迅速,后期则趋于平稳。陈化处理到25个周期时,生物炭对对苯二酚的吸附量由初始的5.93mg·g~(-1)增加到11.73mg·g~(-1),说明陈化处理增加了稻壳生物炭的吸附能力。陈化处理对pH值的影响呈先下降后上升,最后趋于平稳,且与原始生物炭pH值无显著差异。碳酸盐含量则呈现下降趋势至20个周期后趋于平稳。综合分析表明陈化处理对稻壳生物炭理化性质有一定影响,对其速效养分和吸附能力影响较显著。
[Abstract]:Although the properties of biochar are stable, they are not fixed, and their physicochemical properties will change slowly with time, which will have an effect on their functions. In order to clarify the effect of aging on the physicochemical properties of biochar, the aging mechanism of biochar was investigated. Using rice husk biochar as experimental material, 25 cycles of freeze-thaw cycle (30 鈩,
本文编号:2216414
[Abstract]:Although the properties of biochar are stable, they are not fixed, and their physicochemical properties will change slowly with time, which will have an effect on their functions. In order to clarify the effect of aging on the physicochemical properties of biochar, the aging mechanism of biochar was investigated. Using rice husk biochar as experimental material, 25 cycles of freeze-thaw cycle (30 鈩,
本文编号:2216414
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