Fast mineralization of acetaminophen by highly dispersed Ag-g-C3N4 hybrid assisted photocatalytic ozonation
| Autor: | Yu Ling, Peng Xu, Laisheng Li, Gaozu Liao |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Filtration and Separation 02 engineering and technology Mineralization (soil science) Electron acceptor 021001 nanoscience & nanotechnology Analytical Chemistry Catalysis law.invention Metal Reaction rate constant 020401 chemical engineering chemistry law visual_art Photocatalysis visual_art.visual_art_medium Calcination 0204 chemical engineering 0210 nano-technology Nanosheet Nuclear chemistry |
| Zdroj: | Separation and Purification Technology. 216:1-8 |
| ISSN: | 1383-5866 |
| DOI: | 10.1016/j.seppur.2019.01.057 |
| Popis: | Highly dispersed Ag-g-C3N4 hybrid was synthesized successfully by a simple calcination method in present study. The samples were characterized by TEM, XRD, XPS, BET and UV–vis DRS. The results indicate that Ag element are existent as metallic silver and highly dispersed in the matrix of g-C3N4 nanosheet. It was used as active catalyst for photocatalytic ozonation of acetaminophen (ACE) (solar light/Ag-g-C3N4/O3). The results showed that the apparent rate constant of mineralize ACE by solar light/4% Ag-g-C3N4/O3 during 120 min is almost 2 times as large as that with solar light/g-C3N4/O3. The mechanism of photocatalytic ozonation with 4% Ag-g-C3N4 was further confirmed. In this system, Ag acts as not only a good photo-generated electron acceptor for photocatalysis but also a beneficial decomposition center for ozone. Subsequently, holes and hydroxyl radicals both make contribution to the mineralization of ACE in solar light/4% Ag-g-C3N4/O3 process. A superior synergistic effect was observed in mineralization of ACE according to the synergy index of 5.3. Furthermore, Effects of various pH values and silver contents on the ACE mineralization were evaluated. The pathway of ACE degradation in photocatalytic ozonation system with 4% Ag-g-C3N4 was also proposed. |
| Databáze: | OpenAIRE |
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