Role of humic acid in enhancing dissolved air flotation for the removal of TiO2 nanoparticles
| Autor: | Jean-Luc Trompette, Ming Zhang, Pascal Guiraud |
|---|---|
| Přispěvatelé: | Laboratoire d'Ingénierie des Systèmes Biologiques et des Procédés (LISBP), Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Recherche Agronomique (INRA), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, China Scholarship Council (CSC), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut National de la Recherche Agronomique (INRA)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Génie Chimique (LGC), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Institut National Polytechnique de Toulouse - INPT (FRANCE) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
General Chemical Engineering
Dissolved air flotation Inorganic chemistry carbone organique dissous Nanoparticle séparation par précipitation 02 engineering and technology 010501 environmental sciences 01 natural sciences complex mixtures nanoparticule Industrial and Manufacturing Engineering Suspension (chemistry) Colloid [CHIM.GENI]Chemical Sciences/Chemical engineering Dissolved organic carbon flottation process Humic acid Génie chimique [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering Génie des procédés Effluent 0105 earth and related environmental sciences chemistry.chemical_classification Chemistry nanoparticle flottation General Chemistry doc 021001 nanoscience & nanotechnology acide humique Air flotation 13. Climate action TI02 nanoparticles 0210 nano-technology effluent Stock solution |
| Zdroj: | Industrial and engineering chemistry research Industrial and engineering chemistry research, American Chemical Society, 2017, 56 (8), pp.2212-2220. ⟨10.1021/acs.iecr.6b04572⟩ Industrial and engineering chemistry research, 2017, 56 (8), pp.2212-2220. ⟨10.1021/acs.iecr.6b04572⟩ |
| ISSN: | 0888-5885 1520-5045 |
| DOI: | 10.1021/acs.iecr.6b04572⟩ |
| Popis: | Adresse actuelle de Zhang Ming : State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, Institute of Biofilm Technology, College of Environmental Science and Engineering, Tongji University,Shanghai Chine; International audience; The particle separation efficiency by flotation sharply decreases or even completely fails when the diameter of dispersed particles falls into the nanoscale. In the present laboratory work, humic acid was used to enhance the removal of TiO2 nanoparticles from suspension in a chemical coagulant-free dissolved air flotation process. Without humic acid, merely 63.8% of TiO2 nanoparticles were removed. For the humic acid-assisted dissolved air flotation, the pH of humic acid solution significantly influenced the removal efficiency: more than 90% of nanoparticles could be separated when the pH of the humic acid stock solution was acidic; however, the basic solutions resulted in rather poor performance. In the acidic solution, the fiberlike humic acid might form colloids through the attraction between hydrophobic moieties. They possibly acted as a fishnet and trapped nanoparticles, leading to the great measured bubble–particle attachment efficiency. In all the effluents, a low residual dissolved organic carbon was observed, revealing a good participation of humic acid in flotation. Moreover, a higher air-to-solid ratio could improve the nanoparticle elimination by offering a larger surface area of air bubbles. The fractal dimension of flotation flocs demonstrated that the aggregates with compact structure took greater advantage in the flotation separation of nanoparticles. |
| Databáze: | OpenAIRE |
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