Removal of organic contaminants such as azo dyes is highly desirable because of their toxicity, stability, and mutagenic properties. Herein an efficient method for the photodegradation of two well-known model azo dyes, namely metanil yellow (MY) and methyl orange (MO), under sunlight by multiple-heteroatomdoped carbon dots (CD) (nitrogen-, sulfur-, and phosphorusdoped-CD (NSP-CD)) is presented. The photodegradation results favored sunlight as a sustainable light source, as its value of t 1/2 is significantly less than that of artificial light (100 W tungsten bulb). Various parameters, such as the concentrations of individual dyes (20−100 ppm), a mixture of both dyes, changes in pH, and foreign/interfering ions, were investigated to understand the photocatalytic activity of NSP-CD. Under sunlight, photodegradation of ∼20 ppm of dye was observed in ∼60 min (for MY) and ∼90 min (for MO), respectively. A comparative NMR investigation was performed to confirm the photodegradation of the complex structural framework of azo dyes by NSP-CD. Moreover, to explore the real-life utility of the process, sunlight-promoted photodegradation experiments were conducted by externally spiking four different types of industrial samples. Spiking of MY and MO dyes with concentrations in the range of ∼15−23 ppm showed similar results of photodegradation.

No abstract

No abstract

No abstract

No abstract

Herein, we provide a possible description for the isolation/fabrication of nanocarbons from freely available global pollutant waste as black-carbonaceous-soot particulates known as black carbon (BC). It is important to mention here that BC contains many different types of nanocarbons, which have routinely been formed during combustion and were further admixed with air, and therefore enhancing the possibility of global warming. Nevertheless, the different composition and burning condition of fuel results in the emission of different-sized−shaped soot particulates. BC particulates are generally divided into two categories, i.e., indoor and outdoor BC. A possibility has been discussed here to develop some more easily accessible isolation methodologies for the extraction of nanocarbons from BC, explicitly with the expectation to use them for fruitful purposes. Additionally, it will also contributing in improving the overall air quality. In particular, this review summarizes the spectroscopic and microscopic identifications of nanocarbons isolated from the different types of indoor and outdoor BC particulates. Further, in subsequent sections, we have discussed their possible applications, like sensing, bioimaging/biological activity, adsorption, photocatalysis, energy storage devices, agricultural uses, photonics, superamphiphobic material, etc.

No abstract

No abstract