Rambutan seed waste-derived nitrogen-doped carbon dots with l-aspartic acid for the sensing of Congo red dye

Abstract

In this study, new nitrogen-doped carbon dots (N-CDs) were prepared by utilizing rambutan seed waste and l-aspartic acid as dual precursors (carbon and nitrogen sources) through a hydrothermal treatment method and applied as a fluorescent sensor toward Congo red.

Economically viable N-doped graphene aerogel for the photodegradation of structurally different dyes and a plant-model-based environmental assessment

“…1 Residual dyes and waste in industrial effluent discharge are a major contributor to water pollution due to their highly toxic and hazardous nature even at low concentrations. 2,3 More seriously, most organic dyes are resistant to aerobic digestion, recalcitrant, 4 and stable toward oxidizing agents, 5 which create serious threats to human health, including carcinogenic 6 and mutagenic effects. 7 From an environmental view, they can potentially damage aquatic biota by blocking natural sunlight and can dissolve oxygen in water bodies due to their complex chemical nature.…”

Simple fluorescence “turn-off” assay for Congo red using commercial 2-aminophthalic acid

“…CR is commonly utilized as a pigment and dye in food, pharmaceutical, cosmetic, paper, plastic, printing, dyestuff, leather and textile industries, producing plenty of wastewater containing CR. [1][2][3][4][5] CR is resistant to photodegradation and biodegradation in nature because of its highly stable aromatic structure. 1 And CR is highly toxic to human health and the environment.…”

“…[1][2][3][4][5] CR is resistant to photodegradation and biodegradation in nature because of its highly stable aromatic structure. 1 And CR is highly toxic to human health and the environment. Once entering the human body, its metabolite, benzidine, is a notorious carcinogen and mutagen.…”

“…[2][3][4][5][6] Moreover, CR can lead to nausea, vomiting, diarrhea, and allergic problems. 1,4,5 Consequently, sensitive detection of CR is of considerable signicance.…”

“…In the past few years, some techniques have been developed for the determination of CR, such as ultraviolet-visible (UV-vis) absorption spectrometry, 2 uorescent methods, 1,4,5,7 electrochemical methods, 3,6,8 surface-enhanced Raman scattering (SERS), 9 high-performance liquid chromatography (HPLC) 10 and so on. The UV-vis absorption spectrometry is a commonly used method for quantifying CR.…”