Characterization of dissolved organic matter in biochar derived from various macroalgae (Phaeophyta, Rhodophyta, and Chlorophyta): Effects of pyrolysis temperature and extraction solution pH

文献类型： 外文期刊

第一作者： Zhou, Shanshan

作者： Zhou, Shanshan;Fu, Yu;Sun, Xiumei;Li, Tiejun;Yang, Chenghu;Zhou, Shanshan;Fu, Yu;Sun, Xiumei;Li, Tiejun;Yang, Chenghu;Liu, Yangzhi;Yang, Chenghu;Yang, Chenghu

作者机构：

关键词： Biochar; Macroalgae; Dissolved organic matter (DOM); Fluorescence; Parallel factor (PARAFAC)

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 869 卷

页码：

收录情况： SCI

摘要： Characterization of biochar-derived dissolved organic matter (DOM) can provide deep insight into potential applica-tions of biochar. Herein, biochar from six macroalgae (Phaeophyta-Sargassum fusiforme, Sargassum thunbergii, and Sargassum vachellianum; Rhodophyta-Grateloupia turuturu and Chondria crassicaulis; and Chlorophyta-Ulva pertusa) were subjected to pyrolysis at different temperatures (200 degrees C-500 degrees C). The effects of pyrolysis temperature and extrac-tion solution pH on the characteristics of the macroalgal biochar-derived DOM (MBDOM) were investigated via fluo-rescence excitation-emission matrix spectroscopy with parallel factor (PARAFAC) analysis. Five humic-like substances and one protein-like substance were identified. The distributions of the six PARAFAC components depended on the macroalgae species, pyrolysis temperature, and extraction solution pH. The proportion of the protein-like substance (0 %-46.77 %) was less than that of the humic-like substances (100 %-53.23 %) in a given MBDOM regardless of the extraction solution pH values. Fluorescence spectral indicators show that DOM from macroalgal biochar is more autochthonous and humified than that from the corresponding biomass. Hierarchical cluster analysis and redundancy analysis results further show that the macroalgae species, pyrolysis temperature, and extraction solution pH jointly affect DOM characteristics with varying contribution levels.

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