Fern Dicranopteris linearis-derived biochars: Adjusting surface properties by direct processing of the silica phase
Fern Dicranopteris linearis-derived biochars: Adjusting surface properties by direct processing of the silica phase
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DOI：
10.1016/j.colsurfa.2019.123937
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发表时间：
2019-12-20
影响因子：
5.2
通讯作者：
Minh N Nguyen
中科院分区：
文献类型：
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作者：
Nga T Mai;Nam H Nguyen;Minh N Nguyen
这项工作特别强调了蕨类植物芒萁中所含的二氧化硅相的作用。linearis），一种在热带和亚热带地区广泛存在的普通灌木，对生物炭表面性质的影响。在400 - 900 ℃的温度范围内在各种环境反应条件下进行缓慢热解，即，非生物炭定向条件（开放热解）和生物炭定向条件（封闭热解和N2负载热解）。在微观形态和不同的表面性质，比表面积和表面电荷，由此产生的变化进行了阐述。开放式热解导致生物质的过度分解和二氧化硅的缩合，而封闭和N2-负载热解方法显示出显着的生物质炭产率的提高。二氧化硅作为蕨类植物的内部嵌入部分的存在D. Linearis和衍生的生物炭可能支持碳-二氧化硅结构模型，其中这两种组分可能在热解期间整合或分解。一般来说，有机碳和二氧化硅的联合处理大大改变了表面性质。在较低的温度下，在N-2支持的热解，有机化合物的缩合限制了高表面电荷密度的发展。在较高的温度和开放热解过程中，二氧化硅相的强化伴随着越来越多的带电表面位点，从而增加了表面电荷密度。基于多孔结构、大的比表面积（高达701 m2·g-1）和高的表面电荷密度（高达0.5 μ mol·（-）·m-2），D. Linearis衍生的生物炭可作为潜在的农业环境材料。
This work specifically emphasizes the effect of the silica phase contained in the fern Dicranopteris linearis (D. linearis), a common shrub occurring widely throughout tropical and subtropical regions, on biochar surface properties. Slow pyrolysis was performed in the temperature range from 400 to 900 degrees C under various ambient reaction conditions, i.e., non-biochar-oriented conditions (open pyrolysis) and biochar-oriented conditions (closed and N-2-supported pyrolysis). The resulting changes in micromorphology and different surface properties, specific surface area and surface charge, were elucidated. Open pyrolysis resulted in excessive decomposition of biomass and condensation of silica, while the closed and N-2-supported pyrolysis methods showed notable enhancement of biochar yield. The presence of silica as an inter-embedded part of the fern D. linearis and the derived biochars likely supported a carbon-silica structural model in which these two components might be integrated or decomposed during pyrolysis. In general, joint processing of organic carbon and silica greatly altered the surface properties. At lower temperatures and during N-2-supported pyrolysis, condensation of organic compounds limited the development of high surface charge densities. At higher temperatures and during open pyrolysis, intensification of the silica phase was accompanied with an increasing number of charged surface sites, thereby increasing the surface charge density. Based on the porous structure, large surface area (up to 701 m(2)g(-1)) and high surface charge density (up to 0.5 mu mol((-))m(-2)), D. linearis-derived biochars can be highlighted as potential agro-environmental materials.