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The enhanced photocatalytic process of GMNT NCs was achieved by wet impregnation. The resulting sample was examined using numerous analytical techniques to determine its composition, morphology, structure, and optical properties. GMNT photocatalyst showed impressive photocatalytic degradation efficiency (91.75%) over RhB dye in 100 min, when exposed by visible illumination. The photoreaction rate constant of GMNT ternary PCs (0.0233 min−1) was 6.2 times faster than bare GCN (0.0037 min−1), GMS (0.0055 min−1), and GCNT (0.0124 min−1) against RhB dye. Besides, they have considerable stability against RhB dye degradation after five cycles. A trapping experiment with a variety of scavengers also reveals that photogenerated charge carriers hole pair and ⋅O2− radicals play a prominent role in the photodegradation process. GMNT nanocomposite has been shown to enhance photocatalytic performance by suppressing e−–h+ pair separation and recombination efficiency. Hence, GMNT PCs have shown high potential for various environmental applications, including wastewater treatment. [ABSTRACT FROM AUTHOR]

The perovskite CaSnO 3 /g-C 3 N 4 heterostructure nanocomposite was successfully prepared via facile solid-state route. The properties of morphology, structural, optical, functional, elemental, surface, electrochemical and photocatalytic performances were investigated. The synthesised CaSnO 3 (CS) nanoparticles were grafted on the g-C 3 N 4 nanosheets and their photocatalytic performance were determined. The introduction of g-C 3 N 4 possesses solid-solid intimately contacted interfaces with CS that provides more transport paths and effectively improve the separation of photogenerated electrons and holes (e−/h+). Thus, the formation of CaSnO 3 /g-C 3 N 4 (CGN) heterostructures exhibits with tunable optical bandgap and suppresses the charge recombination process that leads to improve the photocatalytic efficiency. Compared with bare CS the CGN photocatalyst achieves 95% of degradation efficiency over methylene blue (MB) dye in 120 min of UV–visible light irradiation. The possible photocatalytic degradation mechanism was discussed. Furthermore, the CGN photocatalyst has been utilized for 4 repeated runs of experiments which shows good stability and reusability after the degradation experiments. [Display omitted] • Perovskite CaSnO 3 /g-C 3 N 4 photocatalyst was successfully prepared via facile method. • Maximum degradation efficiency was attained up to 95% after 120 min of irradiation. • Superoxide radicals are the key active species in the MB dye degradation process. • CGN photocatalyst has been highly stable and reusability after 4 recycles. [ABSTRACT FROM AUTHOR]

Effective improvement of an easily recoverable photocatalyst is equally vital to its photocatalytic performance from a practical application view. The magnetically recoverable process is one of the easiest ways, provided the photocatalyst is magnetically strong enough to respond to an external magnetic field. Herein, we prepared graphitic carbon nitride nanosheet (g-C 3 N 4), and ZnS quantum dots (QDs) supported ferromagnetic CoFe 2 O 4 nanoparticles (NPs) as the gC 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid photocatalyst by a wet-impregnation method. The loading of CoFe 2 O 4 NPs in the g-C 3 N 4 /ZnS nanohybrid resulted in extended visible light absorption. The ferromagnetic g-C 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid exhibited better visible-light-active photocatalytic performance (97.11%) against methylene blue (MB) dye, and it was easily separable from the aqueous solution by an external bar magnet. The g-C 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid displayed excellent photostability and reusability after five consecutive cycles. The favourable band alignment and availability of a large number of active sites affected the better charge separation and enhanced photocatalytic response. The role of active species involved in the degradation of MB dye during photocatalyst by g-C 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid was also investigated. Overall, this study provides a facile method for design eco-friendly and promising g-C 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid photocatalyst as applicable in the eco-friendly dye degradation process. [Display omitted] • g-C 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid exhibited better photocatalytic performance, compared to bare samples. • g-C 3 N 4 /ZnS/CoFe 2 O 4 nanohybrid was easily separable from the aqueous solution by an external bar magnet. • g-C 3 N 4 -ZnS-CoFe 2 O 4 nanohybrid displayed excellent photostability after five consecutive cycles. [ABSTRACT FROM AUTHOR]

A dual Z-scheme g-C 3 N 4 -Co 3 O 4 -V 2 O 5 nanocomposite was synthesized through a simple wet impregnation technique. The phase purity and optical behavior of the synthesized samples were characterized by various analytical techniques. The morphology consequences indicated that Co 3 O 4 nanorods and V 2 O 5 nanoparticles were effectively embedded on the exterior of g-C 3 N 4 nanosheets. The emission properties and energy band gap measurement of g-C 3 N 4 -Co 3 O 4 -V 2 O 5 nanocomposite reveal suppression of e−-h+ recombination and the optical absorption are redshifted to the visible region. The photodegradation capability of the prepared samples was assessed against mixed organic dyes (methylene blue (MB) and methyl yellow (MY)) under visible light illumination. The g-C 3 N 4 -Co 3 O 4 -V 2 O 5 nanocomposite established that the enhanced photocatalytic properties in the photodegradation of mixed dyes compared to bare and hybrid samples. The as-prepared g-C 3 N 4 -Co 3 O 4 -V 2 O 5 nanocomposite shows the enhanced degradation efficiency for 93.8 and 93.2% over the MY and MB aqueous dyes under the visible light irradiation. Notably, the g-C 3 N 4 -Co 3 O 4 -V 2 O 5 photocatalyst was recycled in four consecutive runs with no noticeable loss of catalytic performance. A synergistic dual Z-scheme g-C 3 N 4 -Co 3 O 4 -V 2 O 5 photocatalyst could be constructed based on the energy band matching within g-C 3 N 4 , Co 3 O 4 and V 2 O 5 NPs. [Display omitted] • g-C 3 N 4 -Co 3 O 4 -V 2 O 5 nanocomposite was prepared through wet impregnation method. • It exhibits excellent photocatalytic performance of mixed organic dyes (MB + MO). • The g-C 3 N 4 -Co 3 O 4 -V 2 O 5 nanocomposite exhibits outstanding reusability after 4 cycles. [ABSTRACT FROM AUTHOR]

• Biomolecule-capped CdTe nanoparticles were prepared through simple hydrothermal method. • L-arginine capped CdTe nanoparticles showed enhanced photoactivity under visible-light. • The hydroxyl and superoxide radical play a chief role in the degradation of methyl orange dye. In this study, L-arginine-capped cadmium telluride (CdTe) nanoparticles (NPs) were successfully prepared using the hydrothermal process. The formation, morphology, and physicochemical properties of the prepared samples were successfully characterized using different analytical techniques, such as X-ray diffraction (XRD), Fourier transforms infrared (FTIR), High-resolution transmission electron microscopy (HRTEM), Ultraviolet–visible spectroscopy (UV–Visible) and Photoluminescence spectroscopy (PL). The photocatalytic activity of the prepared samples was evaluated by the degradation of methyl orange (MO) dye under visible-light. It was observed that 86.3% MO dye removal efficiency was achieved over L-arginine-capped CdTe NPs, which was 1.6 times higher than that of the bare CdTe NPs. Interestingly, the L-arginine-capped CdTe photocatalyst was recycled in four consecutive runs without significant activity loss. [ABSTRACT FROM AUTHOR]

[Display omitted] • Preparation of different weight percentages of CQD and MWCNT supported MnO 2 hybrid nanoparticles. • Photocatalytic degradation of MB dye under UV–Visible light with an efficiency of 89.83 %. • Study on anticancer activity of prepared hybrid samples against HeP2 Cell line. • The optimized weight percentage of MWCNT /CQDs/MnO 2 shows improved photocatalytic degradation and anticancer activity. The multiwall carbon nanotubes (MWCNT) and carbon quantum dots (CQDs) supported MnO 2 hybrid nanoparticles were prepared by simple hydrothermal approach. Photocatalytic degradation and anticancer activity of the as-prepared hybrid samples were investigated against the methylene blue (MB) dye and HeP2 cell respectively. The hybrid nanoparticles show improved photocatalytic degradation against MB dye due to its fast charge carrier generation and improved charge carrier mobility. Similarly, the photocatalytic degradation ability of the 0.1 weight percentage of MWCNT loaded MnO 2 /CQDs hybrid samples show improved photocatalytic activity compared to other samples. In addition, the as-prepared MWCNT/CQD/MnO 2 -1, and MWCNT/CQD/MnO 2 -2 hybrid nanocomposites were assessed for their scavenging anti-cancer ability against HeLa cell lines in the different doses at various incubation intervals. In anticancer activity against HeLa cell lines, the high weight percentage of chitosan derived CQDs supported MWCNT/MnO 2 hybrid samples shows a high inhibition rate at minimal concentration due to their good synergy through effective molecular bindings. Also, the observed effective IC50 concentration of the MWCNT/CQD/MnO 2 -2 exhibits 15.6 μg/mL. All these results affirm that CQDs derived from chitosan play a significant role in comparison with MWCNT in achieving 50 % cell viability at minimum IC50 concentration. [ABSTRACT FROM AUTHOR]

Water pollution is a serious problem that threatens both developed and developing countries. Several methods have been used to purify contaminated water, among which the photocatalytic decomposition approach is widely used to purify contaminated water from organic pollutants. In this work, biomass derived SiO 2 nanoparticles composite with TiO 2 semiconductors used as an efficient photocatalyst for degradation of RhB dye molecules under UV−visible light irradiation is proclaimed. The different weight percentages of Arundo donax L. ash-derived SiO 2 nanoparticles combined with TiO 2 nanoparticles were prepared through the wet impregnation method. The photocatalytic degradation ability of the as-prepared samples has been scrutinized against the degradation of Rh B dye in which the pronounced photocatalytic degradation efficiency 93.7% is successfully achieved on 50 wt % SiO 2 -50 wt % TiO 2 nanocomposite photocatalyst. The catalytic performance of the nanocomposite decreases with an increase of 50%–75% in SiO 2 nanoparticles. There could have been a decrease in degradation efficiency due to an excess amount of SiO 2 covering TiO 2 nanoparticles, which prevented photons from reaching the nanoparticles. The efficiency of cyclic decomposition of the 50 wt% SiO 2 -50 wt% TiO 2 composite showed only a slight change in photocatalytic capacity compared to the first cycle, which ensures the durability of the sample. However, the hydroxyl radical species play the main role in the degradation process, which has been confirmed by the scavenger test. The probable reaction mechanism is also deliberated in detail. The high photocatalytic performance of novel eco-friendly SiO 2 -TiO 2 photocatalyst make it ideal for water purification applications. [Display omitted] • To prepare efficient different weight percentage SiO 2 /TiO 2 nanocomposites. • SiO 2 /TiO 2 nanocomposite exhibited higher photocatalytic performance. • To study the role of different radicals in degrading the dye pollutants. [ABSTRACT FROM AUTHOR]