The Fe–N–C oxidase-like nanozyme used for catalytic oxidation of NOM in surface water
| Autor: | Hankun Yang, Lei Su, Xue Wu, Wenzheng Yu, Yiming Ma, Nigel Graham |
|---|---|
| Přispěvatelé: | Commission of the European Communities |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences 01 natural sciences Catalysis Water Purification Humic acid Waste Management and Disposal Humic Substances 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering chemistry.chemical_classification Chemistry Ecological Modeling Mineralization (soil science) Pollution 020801 environmental engineering Chemical engineering Catalytic oxidation Water treatment Cyclic voltammetry Aeration Oxidoreductases Surface water Water Pollutants Chemical |
| Popis: | The removal of natural organic matter (NOM), particularly humic substances (HS) from surface waters during drinking water treatment is necessary to avoid various water quality problems in supply, such as the formation of disinfection by-products. As an alternative to conventional processes (e.g. coagulation), and in the light of the rapidly increasing applications of nanozyme in bio-catalysis, a novel Fe–N–C oxidase-like nanozyme (FeNZ) has been prepared and used to catalyze the oxidative degradation of NOM during simple aeration. Using humic acid (HA) as a model NOM it was found that the HA removal (as TOC) was increased by a factor of 6 with a low dose (10 mg/L) of FeNZ compared to an aerated solution without FeNZ. A variety of analytical methods was used to investigate the oxygen reduction reaction, including cyclic voltammetry, electron spin resonance, and density functional theory (DFT) simulation. Based on these studies, a catalytic oxidation mechanism described as “adsorption-activation-oxidation” was proposed. The enhanced NOM removal performance of FeNZ catalytic oxidation was confirmed with samples of natural surface water in terms of organic mineralization and conversion of hydrophobic to hydrophilic components. The results show great potential for the use of oxidase-like nano catalytic materials in the field of water treatment. |
| Databáze: | OpenAIRE |
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