{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,24]],"date-time":"2026-10-24T01:40:17Z","timestamp":1792806017602,"version":"4.5.0"},"reference-count":37,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2023,9,23]],"date-time":"2023-09-23T00:00:00Z","timestamp":1695427200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["21766025"],"award-info":[{"award-number":["21766025"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Inner Mongolia University of Science &amp; Technology","award":["21766025"],"award-info":[{"award-number":["21766025"]}],"id":[{"id":"https:\/\/ror.org\/044rgx723","id-type":"ROR","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Humic acid is a type of polymeric, organic weak acid mixture with a core aromatic structure and main-component oxygen-containing functional group. Fulvic acid is a type of humic substance that can be dissolved in acid, alkali, or water. This study discusses the influence of different peptides on the molecular structure of fulvic acid, which was extracted from herbaceous, woody, and mossy peats using alkaline dissolution and acid precipitation methods. Analyses using infrared, UV-Vis, 13C-NMR, and X-ray photoelectron spectroscopies, as well as X-ray diffraction (XRD), were conducted to compare the effects of different peat types on the content and molecular structure of fulvic acid. The woody peat fulvic acid content was the highest among all peat fulvic acids (0.38%). However, the yield of fulvic acid from herbaceous peat was the highest (2.53%). Herbaceous peat fulvic acid contains significant quantities of carbonyl, amino, methylene, carboxyl, and phenolic hydroxyl groups and ether bonds. Woody peat fulvic acid contains carbonyl and methoxy groups, benzenes, aromatic carbons, aromatic ethers, and phenols. The degree of aromatization of woody peat fulvic acid was the highest. Mossy peat fulvic acid contains high levels of hydroxy, methyl, methylene, and phenol groups and aromatic ethers. The structural differences in fulvic acids in the different types of peat were primarily manifested in the content of functional groups, with little influence from the types of functional groups. XRD analysis of the different peats revealed that their structures all comprised benzene rings. However, mossy peat contained more C=O and \u2013COOH groups, whereas herbaceous peat contained more C\u2013O groups.<\/jats:p>","DOI":"10.3390\/molecules28196780","type":"journal-article","created":{"date-parts":[[2023,9,24]],"date-time":"2023-09-24T10:48:31Z","timestamp":1695552511000},"page":"6780","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Preparation and Molecular Structural Characterization of Fulvic Acid Extracted from Different Types of Peat"],"prefix":"10.3390","volume":"28","author":[{"given":"Di","family":"Wu","sequence":"first","affiliation":[{"name":"School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanan","family":"Lu","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Litong","family":"Ma","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China"},{"name":"Inner Mongolia Engineering Research Center of Comprehensive Utilization of Bio-Coal Chemical Industry, Baotou 014010, China"},{"name":"Laboratory of Low Rank Coal Carbon Neutralization, Inner Mongolia University of Science and Technology, Baotou 014010, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianguo","family":"Cheng","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China"},{"name":"Inner Mongolia Engineering Research Center of Comprehensive Utilization of Bio-Coal Chemical Industry, Baotou 014010, China"},{"name":"Laboratory of Low Rank Coal Carbon Neutralization, Inner Mongolia University of Science and Technology, Baotou 014010, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoxia","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China"},{"name":"Inner Mongolia Engineering Research Center of Comprehensive Utilization of Bio-Coal Chemical Industry, Baotou 014010, China"},{"name":"Laboratory of Low Rank Coal Carbon Neutralization, Inner Mongolia University of Science and Technology, Baotou 014010, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,9,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"103383","DOI":"10.1016\/j.coal.2019.103383","article-title":"Recognition of peat depositional environments in coal","volume":"219","author":"Dai","year":"2020","journal-title":"Int. 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