文章基本信息

标题：Preparation and characterization of natural and synthetic humic acids by thermogravimetry analysis
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作者：Nelson Consolin Filho ; Marcilene Ferrari Barriquello Consolin ; Patrícia Valderrama 等
期刊名称：Revista Ibero-Americana de Ciências Ambientais
电子版ISSN：2179-6858
出版年度：2020
卷号：11
期号：5
页码：12-20
DOI：10.6008/CBPC2179-6858.2020.005.0002
出版社：Escola Superior de Sustentabilidade
摘要：In this study, a polymer with characteristics analogous to that of the humic acid was obtained through oxidative polymerization in alkaline medium using para-benzoquinone as precursor, and compared to natural humic acid (HA) extracted from a soil. Complexes of as-prepared synthetic humic acid (SHA) with the Cu2 , Fe3 and Mn2 ions were also prepared. Elemental analysis and thermogravimetry were used for comparing the SHA characteristics with those of HA and for evaluating the effect of the metal-type for complexing with SH and SHA. Element analysis showed that SHA presented almost the same atomic constitution of HA, except for or sulfur and nitrogen contents, fact that is expected due to the precursor compounds. TGA curves of HA and SHA are quite similar in spite the thermogravimetic index (TGI) indicates higher aromatic portion in SHA. SHA-metallic ions (SHA-Cu2 , SHA-Fe3 and SHA-Mn2 ) complexes presented different thermal stability as compared among them and with the precursor SHA. The data indicate that the complexation is dependent of metallic ion-type and provokes different rearrangements in the SHA matrix.
关键词：Ácido húmico; Ácido húmico sintético; Cátions metálicos; Estabilidade térmica por curvas de TGA