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Selective Removal of ZnO Nanoparticles from Water Using 3-aminopropyltriethoxysilane (APTES) and Monitoring by Meso-tetra(carboxyphenyl)porphyrin (TCPP).
- Source :
- SILICON (1876990X); Aug2022, Vol. 14 Issue 12, p7353-7362, 10p
- Publication Year :
- 2022
-
Abstract
- Metal oxide nanoparticles (MONPs) such as TiO<subscript>2</subscript> and ZnO have been engineered for various industrial manufacturing processes. Among MONPs, environmental exposure to ZnO nanoparticles may cause health concerns about their significant toxicity. This leads to a desire of efficient methods for their removal in the aqueous environment with facile detection. In this work, 3-aminopropyltriethoxysilane (APTES) was chosen to treat aqueous suspensions containing ZnO and other metal oxide nanoparticles. APTES first formed a thin surface layer on ZnO nanoparticles and continued in branching polymerization to link up with adjacent APTES-ZnO nanoparticles. Eventually, a web-like sediment settled down onto the bottom and was confirmed to be APTES-ZnO conjugation by FT-IR. A high removal efficiency over 99 % w of ZnO nanoparticles in aqueous suspension was attained using 2.0 % by volume of APTES. The sedimentation was selective towards ZnO nanoparticles due to electrostatic interaction with ZnO to form a sturdy condensation coagulate. Other MONPs (Al<subscript>2</subscript>O<subscript>3</subscript>, CaO, CeO<subscript>2</subscript>, CuO and TiO<subscript>2</subscript>) did not form any web-like sediment with APTES but could co-precipitate with the ZnO nanoparticles. Meso-tetra(carboxyphenyl)porphyrin (TCPP) could be added as an indicator to co-precipitate with the sediment, with its color changing from red purple to bright green during the formation of APTES-TCPP-ZnO sediment. A filter paper or membrane placed at the bottom greatly facilitated the disposal of all sediments at a low cost. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1876990X
- Volume :
- 14
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- SILICON (1876990X)
- Publication Type :
- Academic Journal
- Accession number :
- 158814320
- Full Text :
- https://doi.org/10.1007/s12633-021-01490-w