Upcycling of exhausted reverse osmosis membranes into value-added pyrolysis products and carbon dots
| Autor: | Grzegorz Lisak, Muhammad Zahin Bin Mohamed Amrad, Shane A. Snyder, Andrei Veksha, Lili Liang |
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| Přispěvatelé: | School of Civil and Environmental Engineering, Interdisciplinary Graduate School (IGS), Nanyang Environment and Water Research Institute, Residues and Resource Reclamation Centre |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Osmosis
Environmental Engineering Materials science Health Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Raw material 01 natural sciences Desalination Tap water Quantum Dots Environmental Chemistry Char Reverse osmosis Waste Management and Disposal 0105 earth and related environmental sciences 021110 strategic defence & security studies Hydrogen Peroxide Hydrothermal Method Pollution Carbon Environmental engineering [Engineering] Membrane Chemical engineering chemistry Pyrolysis Filtration |
| Popis: | Polymeric reverse osmosis (RO) membranes are widely used worldwide for production of fresh water from various sources, primarily ocean desalination. However, with limited service life, exhausted RO membrane modules often end up as plastic wastes disposed of predominantly by landfilling. It is imperative to find a feasible way to upcycle end-of-life RO membrane modules into valuable products. In this paper, the feasibility of RO membrane recycling via pyrolysis and subsequent conversion of resulting char into carbon dots (CDs) through H2O2-assisted hydrothermal method was investigated. RO membrane module pyrolysis at 600 °C produced oil (28 wt%), non-condensable gas (17 wt%), and char (22 wt%). While oil and gas can serve as fuel and chemical feedstock due to rich hydrocarbon content, char was found a suitable precursor for the synthesis of functional CDs. The resulting CDs doped with N (4.8%) and S (1.8%) exhibited excellent water dispersibility, narrow size distribution of 1.3-6.8 nm, high stability, and strong blue fluorescence with a quantum yield of 6.24%. CDs demonstrated high selectivity and sensitivity towards Fe3+ in the range of 0-100 μM with the limit of detection of 2.97 μM and were capable of determining Fe3+ in real water samples (tap water and pond water). Economic Development Board (EDB) Nanyang Technological University The authors would like to acknowledge the Nanyang Environment and Water Research Institute, Nanyang Technological University (Singapore), and the Economic Development Board (Singapore) for the financial support of this research. |
| Databáze: | OpenAIRE |
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