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不同来源腐殖酸在纳米四氧化三铁上的吸附及对其沉降性的影响
The interaction between Fe_3O_4 nanoparticle and different source humic acid, and the influence on nanoparticle suspension

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汤智 1   赵晓丽 2 *   吴丰昌 2   谭一新 2   赵天慧 2   秦宁 2   钟燕平 2  
文摘 对3种不同来源腐殖酸Suwannee、Elliott Soil、Leonardite在纳米四氧化三铁表面的吸附行为进行了对比研究并评估了其对纳米四氧化三铁悬浮/沉降性能的影响.结果显示,3种腐殖酸Suwannee、Elliott Soil、Leonardite在Fe_3O_4NP表面的吸附都能迅速达到平衡,符合Langmuir和Freundlich吸附等温线模型,且吸附量随溶液PH的上升逐渐减弱;相同条件下含有更多羧基、脂肪族的腐殖酸Suwannee在Fe_3O_4 NP表面的吸附量更大,腐殖酸 Suwannee、Elliott Soil、Leonardite 在25℃、pH=7.0条件下最大吸附量分别为91.41、66.11、52.57 mg·g~(-1);悬浮/沉降实验表明Fe_3O_4 NP在水体中聚集程度与溶液的pH有关,溶液PH偏离Fe_3O_4等电点时,Fe_3O_4 NP表面电位越高,越不容易聚集而沉降;水体中广泛存在的溶解性有机质可使Fe_3O_4 NP在水中的悬浮性增强,尤其是靠近等电点时效果更明显,与腐殖酸对Fe_3O_4 NP空间位阻作用相关;通过对不同来源腐殖酸的结构和官能团进行分析发现,腐殖酸中含有的芳香性和羧酸结构对颗粒悬浮性的影响大于脂肪族结构,因此,腐殖酸Elliott Soil、Leonardite吸附到Fe_3O_4 NP表面后,Fe_3O_4 NP更容易在溶液中悬浮.因此,在富含腐殖酸的水体中,Fe_3O_4 NP可以悬浮并不易沉降,其对水生生态系统的影响不容忽视.
其他语种文摘 Adsorption behaviors of humic acids from three different sources (Suwannee, Elliott Soil) and Leonardite on Fe_3O_4 nanoparticles (NPs) were comparatively studied and the influence on Fe_3O_4 NPs settleability was evaluated. The results revealed that, the humic acids adsorption on the Fe_3O_4 NPs reached equilibrium rapidly, which coincided with Langmuir and Freundlich adsorption isotherm models. The adsorption capacity gradually decreased with increasing solution pH.Under the same condition, the humic acid from Suwannee with more carboxyl and aliphatic functional groups was more easily adsorbed on Fe_3O_4 NPs surface. Under the condition of 25℃ and sulution pH=7.0, the maximum adsorption amount of humic acid from Suwannee,Elliott Soil and Leonardite on Fe_3O_4 NPs surface was 91.41,66.11,52.57 mg·g~(-1), respectively.The stability study showed that pH was an important factor accounting for the aggregations of Fe_3O_4 NPs. When the pH deviated from the isoelectric point of Fe_3O_4 NPs, higher surface potential resulted in less aggregated particles. Humic acid enhance the stability of Fe_3O_4 NPs in aqueous solutions, which might be related to the change of steric stabilization of Fe_3O_4 NPs. According to the research on structure and functional groups of humid acids with different sources, aromaticity and carboxylic acid could render Fe_3O_4 NPs higher stability than aliphatic structure, so the Fe_3O_4 NPs adsorbed with humic acids from Elliott Soil and Leonardite are more stable than the partable adsorpted with humic acid from Suwannee. Therefore, Fe_3O_4 NPs tend to suspend rather than settle down in aquatic system rich in humic acid, which brings in a which impact on aquatic ecosystems that should not be ignored.
来源 环境化学 ,2015,34(8):1520-1528 【核心库】
DOI 10.7524/j.issn.0254-6108.2015.08.2015013005
关键词 四氧化三铁 ; 纳米颗粒 ; 腐殖酸 ; 吸附 ; 悬浮/沉降性 ; 官能团
地址

1. 中国科学院广州地球化学研究所, 环境基准与风险评估国家重点实验室, 广州, 510640  

2. 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京, 100012

语种 中文
文献类型 研究性论文
ISSN 0254-6108
基金 国家自然科学基金
文献收藏号 CSCD:5494774

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引证文献 6

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