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Effect of pH or Metal Ions on the Oil/Water Interfacial Behavior of Humic Acid Based Surfactant.
Langmuir ( IF 3.7 ) Pub Date : 2020-08-22 , DOI: 10.1021/acs.langmuir.0c01874
Xiaodong Lian 1 , Shenglong Liao 1 , Yipan Yang 1 , Xiaogang Zhang 1 , Yapei Wang 1
Affiliation  

Humic acid, a kind of widespread organic macromolecule on earth, is naturally formed through the microbial biodegradation of plant, animal, and microorganism residues. Because of the large number of active functional groups (phenolic hydroxyl and carboxyl), humic acid has been considered as a biocompatible, green, and low-cost biosurfactant recently. In this work, based on the sensitivity of humic acid to the external chemical environment, the oil/water interfacial behavior of sodium humate at different pH or in the presence of metal ions is closely investigated. Sodium humate is significantly enriched toward the oil/water interface at either low pH or high metal-ion concentration to adjust the properties of the prepared emulsion, but the mechanisms are proved to be different when considering the influence of pH and metal ions. Besides, to the best of our knowledge, humic acid based surfactant is proposed as a Pickering emulsifier for the first time, known as solid surfactant. This work promises the great potential of humic acid as a natural environment-responsive surfactant and has important implications for the application of humic acid based surfactant in industry and understanding of the role of humic acid in the natural environment.

中文翻译:

pH或金属离子对腐殖酸基表面活性剂油/水界面行为的影响。

腐殖酸是地球上一种分布广泛的有机大分子,是通过植物,动物和微生物残留物的微生物生物降解而自然形成的。由于大量的活性官能团(酚羟基和羧基),腐殖酸最近被认为是一种生物相容的,绿色的,低成本的生物表面活性剂。在这项工作中,基于腐殖酸对外部化学环境的敏感性,密切研究了腐殖酸钠在不同pH值或金属离子存在下的油/水界面行为。在低pH或高金属离子浓度下,腐殖酸钠明显富集到油/水界面,以调节制得的乳液的性能,但在考虑pH和金属离子的影响时,机理被证明是不同的。除了,据我们所知,腐殖酸基表面活性剂首次被提出作为Pickering乳化剂,被称为固体表面活性剂。这项工作预示着腐殖酸作为天然的对环境敏感的表面活性剂的巨大潜力,并对基于腐殖酸的表面活性剂在工业中的应用以及对腐殖酸在自然环境中的作用的理解具有重要意义。
更新日期:2020-09-15
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