期刊
NEW JOURNAL OF CHEMISTRY
卷 46, 期 1, 页码 263-275出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nj04761b
关键词
-
资金
- Brazilian National Research Council (CNPq) [200697/2017-0/GDE]
Wastewater pollution, particularly from dyestuff industries, poses a serious threat to the ecosystem. This study successfully utilized iron and nitrogen-containing carbon dots as catalysts to degrade the commercial dye methylene blue, demonstrating their effectiveness in treating wastewater pollution and reducing toxicity levels.
Wastewater pollution is an existing and serious environmental issue. One of the main wastewater pollution sources is from the dyestuff industries and its discharge poses a serious threat to the ecosystem due to its adverse effects on human and environmental health. Conventional wastewater treatments are limited in terms of effectively treating such non-biodegradable contaminants; thus, this work aimed to investigate the degradation of the commercial dye methylene blue (MB) via advanced oxidation processes (AOPs) using carbon dots as Fenton-like catalysts. Iron and nitrogen-containing carbon dots (Fe, N-CDs) were synthesised through a hydrothermal reaction and utilised as catalysts in the degradation of MB. Multiple characterisation techniques were employed to describe the dot properties including FTIR, XPS, TEM, zeta-potential, PL and UV-Vis analyses. Characterisation revealed the synthesis of 7 nm diameter, spherical negatively charged dots rich in iron and nitrogen surface functionalities. Methylene blue was degraded under mild conditions using an innovative green remediation technology which removed nearly 100% of the dye (20 mg L-1) under optimised conditions (at 50 degrees C, pH 8, H2O2 147 mM, and a catalyst concentration of 0.5 mg mL(-1)) in only 60 minutes. The active mechanism of the Fe, N-CDs was deduced suggesting the participation of free radicals such as hydroxyl radicals, singlet oxygens and holes. Importantly, the effluent toxicity assessed using Microtox (R) confirmed the generation of a non-toxic effluent. This investigation showed that using Fe, N-CDs is an effective way to degrade wastewater pollution whilst significantly minimising its toxicity.
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