天然有机质(NOM)在全球碳循环中扮演重要角色,而无机矿物对有机碳稳定具有重要作用.本实验以Fe2O3(纳米和微米颗粒)和高岭土为吸附剂,探讨复杂多组分NOM模型化合物(单宁酸、没食子酸、富马酸钠和油酸钠)在无机矿物表面的吸附稳定机理.结果表明,4种不同性质的模型化合物在矿物表面均呈现明显的非线性吸附.纳米氧化铁较大的比表面积能够提供更多的吸附位点,有利于其对模型化合物的吸附,但是其比表面积的有效性最低,显示其极大的吸附潜力.不管是芳香性还是脂肪性化学物质,大分子模型化合物的吸附显著高于小分子模型化合物,说明NOM的模型化合物中大分子组分更倾向于吸附在无机矿物表面,这一现象提示NOM在无机矿物表面发生选择性吸附时,有可能优先吸附大分子组分.
Natural organic matters (NOM) play an essential role in global carbon cycles.Their interactions with inorganic minerals are a very important process for carbon stabilization.This study used iron oxide particles (nano and micron ferric oxide) and kaolinite as model adsorbents to investigate the adsorption mechanisms of NOM model compounds with different properties (tannin acid,gallic acid,fumaric acid sodium and sodium oleate) on inorganic minerals.The results showed that the four model compounds exhibited obvious non-linear adsorption on the surface of the minerals.The larger surface area of nano-Fe2O3 may provide more sorption sites,which is beneficial to its adsorption to the model compounds,but the lowest effectiveness of surface area,showing its great potential for adsorption.The sorption of the compounds with high molecular weight was significantly higher than that of the small molecular compounds,indicating their preferential adsorption when the selective adsorption of NOM occurs on inorganic mineral surface.
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