| 宁永星,周佳豪,刘凯,刘高源,段稀朝,郭家文,李芳芳.蒙脱石和赤铁矿对老化生物炭衍生溶解性有机质的优先吸附机制[J].农业环境科学学报,2025,44(6):1563-1570. |
| 蒙脱石和赤铁矿对老化生物炭衍生溶解性有机质的优先吸附机制 |
| Preferential adsorption mechanism of montmorillonite and hematite on aging biochar-derived dissolved organic matter |
| 投稿时间：2024-08-04 |
| DOI：10.11654/jaes.2024-0653 |
| 中文关键词: 生物炭 矿物 吸附 溶解性有机质 老化 |
| 英文关键词: biochar mineral adsorption dissolved organic matter aging |
| 基金项目:国家自然科学基金地区项目（42267028，42167030）；云南省重大科技项目（202202AG050019） |
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| 中文摘要: |
| 为研究蒙脱石和赤铁矿对老化前后生物炭衍生溶解性有机质（BDOM/ABDOM）的优先吸附机制，玉米秸秆生物炭经30%过氧化氢处理制得老化生物炭，并用石英砂（对照组）、蒙脱石和赤铁矿与BDOM/ABDOM进行程序吸附实验。结果表明：由于ABDOM与矿物之间的静电斥力降低，生物炭的老化增加了石英砂对BDOM的吸附，而蒙脱石/赤铁矿添加组则相反。3种矿物对于BDOM首次的吸附效率均最高，矿物结合态有机质（MAOM）形成效率的排序为蒙脱石>赤铁矿>石英砂，MAOM形成效率主要取决于原始矿物本身性质，蒙脱石对BDOM具有较高的吸附量主要是因为更大的比表面积提供了更多吸附位点以及更为显著的阳离子桥接作用。赤铁矿与BDOM中的酪氨酸/色氨酸类蛋白以及富里酸组分具有较高的亲和力，能够优先发生配体交换而吸附。而对于ABDOM，蒙脱石和赤铁矿则优先吸附其中的富里酸及类胡敏酸组分。 |
| 英文摘要: |
| In order to study the preferential adsorption mechanism of minerals on biochar derived dissolved organic matter（BDOM/ABDOM）before and after aging, Aging biochar was prepared from corn straw biochar by 30 % hydrogen peroxide treatment., The program adsorption experiments were carried out using quartz sand（control group）, montmorillonite and hematite with BDOM/ABDOM. The results showed that due to the decrease of electrostatic repulsion between ABDOM and minerals, the aging of biochar increased the adsorption of BDOM by quartz sand, while the montmorillonite/hematite addition group was the opposite. The three minerals have the highest adsorption efficiency for BDOM for the first time. The order of formation efficiency of mineral-associated organic matter（MAOM）is montmorillonite> hematite>quartz sand. The formation efficiency of MAOM depended mainly on the properties of the minerals themselves. Montmorillonite has a higher adsorption of BDOM mainly because of the larger specific surface area. Providing more adsorption sites and more significant cation bridging. Hematite has preferential sorption for tyrosine/tryptophan proteins and fulvic acid components in BDOM through ligand exchange. For ABDOM, montmorillonite and hematite preferentially adsorb fulvic acid and humic acid components. |
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