STXM-NEXAFS研究铁(Ⅲ)离子诱发柠檬酸在高岭石表面的固定机制
文献类型: 中文期刊
作者: 刘瑾;杨建军;曾希柏;Wang, Jian;Donald Sparks
作者机构:
关键词: 土壤碳固定;多价阳离子;X射线扫描透射显微术;X射线近边吸收精细结构谱;水铁矿
期刊名称:化学学报
ISSN: 0567-7351
年卷期: 2017 年 6 期
页码: 617-620
收录情况: JCR(2021版) ; 北大核心(2020版) ; CSCD(2020-2021年度) ; 科技核心(2020版)
摘要: 热带地区土壤有机碳的稳定性受有机碳与高岭石、三价铁离子[Fe(Ⅲ)]交互作用的强烈影响.低分子量有机酸(LMWOAs)是土壤有机碳中最易被微生物降解的组分,研究LMWOAs在高岭石-Fe(Ⅲ)-LMWOAs三相系统中的固定机制对于理解热带地区土壤有机碳循环具有重要意义;然而LMWOAs在该三相系统中固定机制仍不清楚,并缺乏分子水平上的直接证据.本研究以柠檬酸(CA)为LMWOAs的典型代表,通过采集Fe/CA初始物质的量比2.0条件下获取的吸附样品,利用同步辐射X射线扫描透射显微术(STXM)在亚微米尺度上表征C,Fe和Si的分布特征,发现C-Fe分布的相关性与C-Si分布相当;并在高C,Fe微区中利用C的K边和Fe的L3边X射线近边吸收精细结构谱(NEXAFS)在分子水平上揭示了Fe在不同富集微区分别以水铁矿和高岭石-Fe(Ⅲ)-CA三元配合体形式存在,从而表明水铁矿诱发的吸附/共沉淀以及以Fe(Ⅲ)为架桥形成高岭石-Fe(Ⅲ)-CA三元配合作用是CA固定的重要机制.本研究成果对于理解热带地区土壤中CA稳定性和低分子量有机酸的碳固定和循环机制提供了重要科学依据.
分类号: O647.3`S153
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