{"title":"Graphene quantum dots/persulfate boosted electro-oxidation for leachate degradation, carbon quantum dots extraction for anti-counterfeiting applications - a sustainable approach","authors":"R. Priyadarshini Rajesh, M.P. Saravanakumar","doi":"10.1016/j.diamond.2024.111693","DOIUrl":null,"url":null,"abstract":"<div><div>Leachate management in an efficient way is still a challenge as it contains many emerging pollutants. This work activates the persulfate by defatted <em>Moringa oleifera</em> seeds waste-derived graphene quantum dots (M-GQDs) catalyst to degrade the matured leachate pollutants by electro-oxidation with scrap stainless steel as electrodes. At the optimized conditions with pH of 3, 4.5 V, 1 g/L of persulfate, 0.07 g/L of M-GQDs, 3 h of reaction time, the removal of UV<sub>254</sub>, chemical oxygen demand (COD), total organic carbon (TOC), and NH<sub>3</sub>-N is found to be 99 %, 97 %, 84 %, and 90 % respectively with less energy consumption of 0.44 kWh/kg COD. The 3D fluorescence excitation-emission spectrophotometer (3D EEM) and the Gas chromatography-mass spectroscopy (GC–MS) analysis results attune the degradation of dissolved organic matter and micropollutants in the leachate. From the above-mentioned electro-oxidation treatment generated sludge, the quantum dots (S-CQDs), have been synthesized and characterized. Both the M-GQDs and S-CQDs are green emissive, spherical, and hydrophilic, with an average particle size of 2 to 4 nm, a band gap of 4 eV, and a quantum yield of 3.91 %, & 6.73 % respectively. Both have shown good suitability for information encryption and anti-counterfeiting fingerprint enhancement without changing the latent shape. The work is innovative because it broadens the application of quantum dots to the purification of highly contaminated wastewater and the development of materials for industry from generated waste for a closed-loop sustainability system.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111693"},"PeriodicalIF":4.3000,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Diamond and Related Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0925963524009063","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, COATINGS & FILMS","Score":null,"Total":0}
引用次数: 0
Abstract
Leachate management in an efficient way is still a challenge as it contains many emerging pollutants. This work activates the persulfate by defatted Moringa oleifera seeds waste-derived graphene quantum dots (M-GQDs) catalyst to degrade the matured leachate pollutants by electro-oxidation with scrap stainless steel as electrodes. At the optimized conditions with pH of 3, 4.5 V, 1 g/L of persulfate, 0.07 g/L of M-GQDs, 3 h of reaction time, the removal of UV254, chemical oxygen demand (COD), total organic carbon (TOC), and NH3-N is found to be 99 %, 97 %, 84 %, and 90 % respectively with less energy consumption of 0.44 kWh/kg COD. The 3D fluorescence excitation-emission spectrophotometer (3D EEM) and the Gas chromatography-mass spectroscopy (GC–MS) analysis results attune the degradation of dissolved organic matter and micropollutants in the leachate. From the above-mentioned electro-oxidation treatment generated sludge, the quantum dots (S-CQDs), have been synthesized and characterized. Both the M-GQDs and S-CQDs are green emissive, spherical, and hydrophilic, with an average particle size of 2 to 4 nm, a band gap of 4 eV, and a quantum yield of 3.91 %, & 6.73 % respectively. Both have shown good suitability for information encryption and anti-counterfeiting fingerprint enhancement without changing the latent shape. The work is innovative because it broadens the application of quantum dots to the purification of highly contaminated wastewater and the development of materials for industry from generated waste for a closed-loop sustainability system.
期刊介绍：
DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices.
The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.
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