期刊
MOLECULES
卷 24, 期 20, 页码 -出版社
MDPI
DOI: 10.3390/molecules24203701
关键词
silica aerogels; amine modification; volatile organic compounds; heavy metals; textile dyes; adsorption
资金
- National Council for Scientific and Technological Development (CNPq-Brazil) [234184/2014-0/GDE]
- project AerogelDustFree-Aerogel for Space applications ISO8 without dust release [17815]
- European Regional Development Fund (ERDF) through the Operational Program for Competitiveness and Internationalization
- Regional Operational Program of the Center of Portugal (Centro2020) of PT2020
- Fundacao para a Ciencia e a Tecnologia (FCT), the Portuguese Agency for Scientific Research [SFRH/BD/131280/2017]
- national funds (OE), through FCT, Portugal
- FCT (Portugal)
- ERDF (EU) under the PT2020 Partnership Agreement: CIEPQPF -Chemical Process Engineering and Forest Products Research Centre [POCI-01-0145-FEDER-006910, UID/EQU/00102/2019]
- CICECO-Aveiro Institute of Materials [POCI-01-0145-FEDER-007679, UID/CTM/50011/2019]
- CQC -Coimbra Chemistry Centre [UID/QUI/00313/2019]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/131280/2017] Funding Source: FCT
Serious environmental and health problems arise from the everyday release of industrial wastewater effluents. A wide range of pollutants, such as volatile organic compounds, heavy metals or textile dyes, may be efficiently removed by silica materials advanced solutions such as aerogels. This option is related to their exceptional characteristics that favors the adsorption of different contaminants. The aerogels performance can be selectively tuned by an appropriate chemical or physical modification of the aerogel's surface. Therefore, the introduction of amine groups enhances the affinity between different organic and inorganic contaminants and the silica aerogels. In this work, different case studies are reported to investigate and better understand the role of these functional groups in the adsorption process, since the properties of the synthesized aerogels were significantly affected, regarding their microstructure and surface area. In general, an improvement of the removal efficiency after functionalization of aerogels with amine groups was found, with removal efficiencies higher than 90% for lead and Rubi Levafix CA. To explain the adsorption mechanism, both Langmuir and Freundlich models were applied; chemisorption is most likely the sorption type taking place in the studied cases.
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