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科技导报  2015 

炭化温度对沙蒿生物炭K、Ca、Mg含量和pH值的影响

DOI: 10.3981/j.issn.1000-7857.2015.05.014, PP. 88-92

Keywords: 沙蒿,生物炭,炭化温度

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Abstract:

以沙蒿(Artemisiaarenaria)为材料,通过无氧炭化法制取生物炭,研究炭化温度对沙蒿生物炭全K、全Ca、全Mg元素含量及富集效应和pH值的影响。结果表明,生物炭中K、Ca、Mg元素含量均随着炭化温度的升高而升高,K含量的升高幅度最大,K、Ca、Mg元素含量在900℃较300℃分别提高了52.47%、25.76%和86.32%,元素含量的提高与沙蒿生物质中可挥发和分解的组分在不同的炭化温度下逐渐去除有关;升温炭化过程中对K、Ca、Mg等元素均得到了不同程度的富集(相对富集系数RE>1),低温有利于K元素和Ca元素的富集,中温有利于Mg元素的富集,K、Ca、Mg等元素的RE值分别在300、300、500℃时取得最大值,分别为1.17、1.15和1.22;pH值随炭化温度的升高而增大,生物炭的碱性与K、Ca、Mg元素的富集及生物炭表面含氧官能团的种类和数量均有关,与生物炭表面的总碱性官能团有较好的相关性(相关系数为0.8665)。

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