A study on structural evolution of hybrid humic Acids-SiO2 nanostructures in pure water: Effects on physico-chemical and functional properties

被引：26

作者：

Venezia, Virginia ^{[1
]}

Pota, Giulio ^{[1
]}

Silvestri, Brigida ^{[1
]}

Vitiello, Giuseppe ^{[1
,2
]}

Di Donato, Paola ^{[3
]}

Landi, Gianluca ^{[4
]}

Mollo, Valentina ^{[5
]}

Verrillo, Mariavittoria ^{[6
]}

Cangemi, Silvana ^{[6
]}

Piccolo, Alessandro ^{[6
]}

Luciani, Giuseppina ^{[1
]}

机构：

[1] Univ Naples Federico II, Dept Chem Mat & Prod Engn, Ple V Tecchio 80, I-80125 Naples, Italy

[2] Ctr Colloids & Surface Sci, CSGI, Via Lastruccia 3, I-50019 Florence, Italy

[3] Univ Naples Parthenope, Dept Sci & Technol, Ctr Direz Isola C4, I-80143 Naples, Italy

[4] CNR, Inst Sci & Technol Sustainable Energy & Mobil, Ple V Tecchio 80, I-80125 Naples, Italy

[5] Ist Italiano Tecnol CABHC, Ctr Adv Biomat Hlth Care, Largo Barsanti & Matteucci 53, I-80125 Naples, Italy

[6] Univ Naples Federico II, Ctr Interdipartimentale Ric Risonanza Magnet Nucl, Via Univ 100, I-80055 Portici, Italy

来源：

CHEMOSPHERE | 2022年 / 287卷

关键词：

Humic acids (HA); Biowastes; Antioxidant properties; Hybrid nanoparticles; Aging; Supramolecular reorganization; SUPRAMOLECULAR STRUCTURE; ANTIOXIDANT ACTIVITY; MOLECULAR-STRUCTURE; AQUEOUS-SOLUTIONS; FULVIC-ACIDS; NANOPARTICLES; SUBSTANCES; SOIL; STABILITY; HUMUS;

D O I：

10.1016/j.chemosphere.2021.131985

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Humic acids (HA) are considered a promising and inexpensive source for novel multifunctional materials for a huge range of applications. However, aggregation and degradation phenomena in aqueous environment prevent from their full exploitation. A valid strategy to address these issues relies on combining HA moieties at the molecular scale with an inorganic nanostructured component, leading to more stable hybrid nanomaterials with tunable functionalities. Indeed, chemical composition of HA can determine their interactions with the inorganic constituent in the hybrid nanoparticles and consequently affect their overall physico-chemical properties, including their stability and functional properties in aqueous environment. As a fundamental contribution to HA materials-based technology, this study aims at unveiling this aspect. To this purpose, SiO2 nanoparticles have been chosen as a model platform and three different HAs extracted from composted biomasses, manure (HA_Man), artichoke residues (HA_Art) and coffee grounds (HA_Cof), were employed to synthetize hybrid HA-SiO2 nanoparticles through in-situ sol-gel synthesis. Prepared samples were submitted to aging in water to assess their stability. Furthermore, antioxidant properties and physico-chemical properties of both as prepared and aged samples in aqueous environment were assessed through Scanning Electron Microscopy (SEM), N2 physisorption, Simulta-neous Thermogravimetric (TGA) and Differential Scanning Calorimetric (DSC) Analysis, Fourier Transform Infrared (FT-IR), Nuclear Magnetic Resonance (NMR), Electron Paramagnetic Resonance (EPR) spectroscopies. The experimental results highlighted that hybrid HA-SiO2 nanostructures acted as dynamic systems which exhibit structural supramolecular reorganization during aging in aqueous environment with marked effects on physico-chemical and functional properties, including improved antioxidant activity. Obtained results enlighten a unique aspect of interactions between HA and inorganic nanoparticles that could be useful to predict their behavior in aqueous environment. Furthermore, the proposed approach traces a technological route for the exploitation of organic biowaste in the design of hybrid nanomaterials, providing a significant contribution to the development of waste to wealth strategies based on humic substances.

引用

页数：13