Search

• CoP embedded in N, P co-doped carbon nanocomposite was fabricated successfully. • The fabricated CoP-NPC is highly porous with surface area about to 812 m2g−1. • The fabricated catalyst exhibited an excellent bifunctional electrocatalytic activity. • The fabricated catalyst exhibited show excellent stability. In this study, cobalt phosphide nanoparticles embedded with N/P doped carbon matrix was fabricated using hydrothermal and post calcination method of cobalt polymeric complex. The fabricated nanocomposite [CoP-NPC] was characterized using several analytical techniques and used as a bi-functional catalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The results revealed that the CoP nanoparticles were fabricated successfully and embedded in N/P doped carbon. The BET surface area of the nanocomposite was found to be 812.2 m2g−1 and the pore width was found 9 nm. The overpotential for HER and OER were found to 318 mV and 414 mV at 10 mA cm−2 respectively in 1.0 M KOH solution. The CoP-NPC shows superb catalytic activity and excellent stability. In addition, this study providing a new low cost route for the fabrication of CoP into N/P doped carbon as efficient catalysts for water splitting. [ABSTRACT FROM AUTHOR]

• CuO/CuS embedded into N/S-doped was fabricated successfully. • The CuO/CuS @NSC nanocomposite showed the high porosity. • The CuO/CuS @NSC nanocomposite show excellent sensing behavior against NH 3 at room temperature. • Stability performance of the CuO/CuS @NSC sensor over six cycles. A novel nanocomposite based sensor was fabricated for NH 3 gas sensing in using hydrothermal and post calcination method. The composition, morphological, crystallinity and electrochemical properties of the nanocomposites were carried out using corresponding analytical technique. The sensing performances were carried out with several sensing parameters such as sensor response, repeatability, stability, resistance variation and selectivity. The sensor exhibited the excellent sensitivity and its response to 100 ppm NH 3 was 206.15, and it has relatively short response and recovery time of 24 s and 22 s for 100 ppm NH 3 , respectively. The sensor also exhibited excellent selectivity, good reproducibility and perfect response-concentration linearity to NH 3 at room temperature. [ABSTRACT FROM AUTHOR]

• AgNPs embedded into N/S-doped was fabricated using polymer complex. • The AgNPs@NSC nanocomposite showed the high porosity. • The AgNPs@NSC nanocomposite showed the catalytic reduction of 4-nitrophenol. • Stable performance of the AgNPs@NSC catalysts over five cycles. In the present study, silver nanoparticles embedded N/S doped carbon (AgNPs@NSC) was synthesized by hydrothermal treatment of silver polymer complex. The formation of Ag nanoparticles in the N/S doped carbon (NSC) was confirmed via UV–Visible, FTIR, XRD, BET, XPS, and TEM analysis. The synthesized AgNPs@NSC nanocomposite exhibits excellent catalytic activity for the reduction of 4-nitrophenol (4-NP) into 4-nitrophenol (4-AP) in the presence of NaBH 4. The fabricated catalyst show excellent catalytic activities and take only 6 min for the reduction of 4-NP. Furthermore, the highly porosity of carbon retained good activity and stability after five cycles. The foregoing study clearly suggests that synthesis of AgNPs@NSC nanocomposite by this method is efficient towards the development of a newer and a novel catalyst. [ABSTRACT FROM AUTHOR]

• MoS 2 /ZnS embedded into N/S-doped was fabricated using polymer complex. • The MoS 2 /ZnS@NSC nanocomposite showed the high porosity. • The MoS 2 /ZnS@NSC nanocomposite showed the photocatalytic degradation of dicofol pesticide. • The scavenger traping as well as EPR experiments show the role of active species used in degradation. A highly efficient, recyclable mesoporous catalyst has been prepared via hydrothermal and post-calcination methods. The prepared nanocomposite (MoS 2 /ZnS@NSC) was characterized via several analytical techniques and used as a photocatalyst for the degradation of dicofol pesticide under visible irradiation. The results reveal that the fabricated nanocomposite show excellent catalytic activity due to the formation of active photogenerated species such as ●OH, O 2 − and e− which was supported by scavenger traping as well as EPR experiments and show excellent reusability for the treatment of pesticide in aqueous solution. [ABSTRACT FROM AUTHOR]

Hexamethylenetetramine (HMT)-mediated rutile and polycrystalline TiO 2 films are directly grown on a glass substrate by a simple chemical wet deposition method at ambient temperature. After confirming the crystallinity, phase-purity and surface morphology, as-grown TiO 2 films were explored for a variety of target gases including nitrogen dioxide, methanol, ethanol and ammonia at different temperatures for confirming the sensor application potential. The TiO 2 film shows a maximum response of 43% to 100 ppm NO 2 @180 °C with fast response time of 16 s. In addition, the TiO 2 sensor film has potential to detect concentration of NO 2 as low as 10 ppm. [ABSTRACT FROM AUTHOR]

• Novel Mg 0.5-x Cu x Zn 0.5 Fe 2 O 4 spinel ferrite prepared. • Dopant induced shifts in conduction bands-high potential. • High performance removal of carbamazepine under visible light. • ●O 2 – as active species. • High charge separation via metal redox cycle and dopants. Environmental friendly and robust Mg 0.5-x Cu x Zn 0.5 Fe 2 O 4 (x = 0, 0.01 & 0.02) nano-photocatalyst was prepared by facile solution combustion method for high performance photocatalytic removal of carbamazepine (CBZ). Mg 0.3 Cu 0.2 Zn 0.5 Fe 2 O 4 catalyst shows 94.3% degradation in 90 min visible exposure and 78.2% total organic carbon (TOC) removal. The Cu dopant driven conduction band shifting to more negative side leads to improved ●O 2 – formation supported by electron spin resonance (ESR) probe. The dopants and metal redox cycles lead to higher visible absorption and reduced recombination boosting the CBZ removal. The degradation pathway and photocatalytic mechanism is also predicted. [ABSTRACT FROM AUTHOR]

• Novel Fe 3 O 4 -BiVO 4 /Cr 2 V 4 O 13 heterojunction fabricated. • High charge separation and interfacial charge transfer. • High performance removal of fluoxetine under visible light. • ●OH as active species -high potential band protection. • Fe 3 O 4 and Cr redox mediated Z-scheme mechanism. Hybrid heterojunction photocatalysts dramatically improve the pharmaceutical wastewater treatment potential. In this work, we report construction of novel Fe 3 O 4 -BiVO 4 /Cr 2 V 4 O 13 (FBC) with high interfacial transfer for visible and solar photo-degradation of fluoxetine (FX). Within 60 min of visible exposure, FBC removes 99.2% of FX and rate is ~ 8 times BiVO 4. The strongly coupled heterojunction leads high charge separation, interfacial charge transfer which attributes to the exceptional performance. Scavenging experiments and electron spin Resonance (ESR) probe suggest ●OH and ●O 2 – radicals as dominant species. The band structure and other experiments reveal a Z-scheme effective charge transfer is in action mediated by Fe 3 O 4. [ABSTRACT FROM AUTHOR]

• Nanocomposite based photocatalyst is designed. • Nanocomposite demonstrated high degradation activity under visible light. • Photodegradation of dyes with degradation rate of 90–96%. • High reusability. Highly visible light efficient photocatalyst; ferric oxide/zinc oxide/silicon nitride (Fe 3 O 4 /ZnO/Si 3 N 4) nanocomposite has been designed. Its photocatalytic activity has been studied for the degradation of two dyes; sunset yellow and methyl orange from aqueous solution. Results showed high degradation rate of 90 and 96% for sunset yellow and methyl orange, respectively. Scavenging studies indicated the major involvement of OH radicals in the degradation process. Reusability study has been conducted for 6 consecutive cycles indicating its appreciable activity even after repetitive cycles. Antimicrobial activity studied against E. Coli and Pseudomonas strains showed an appreciable inhibition zone. [ABSTRACT FROM AUTHOR]

• Ag0-Ag 2 O@nanocomposite hydrogel: microwave-assisted green reduction process. • Adsorption-coupled-photocatalytic remediation of triclosan. • Excellent performance of 89% remediation was achieved for tricolosan. • The effect of scavengers and reusability were also investigated. A simple microwave-assisted green reduction process has been used for fabricating Ag0-Ag 2 O-embedded nanocomposite hydrogel. The Ag0-Ag 2 O/nanocomposite hydrogel was applied for adsorption-coupled-photocatalytic removal of triclosan, and the excellent performance of 89% removal was achieved. The enhanced removal activity of Ag0-Ag 2 O/nanocomposite hydrogel could be explained by synergism effect taking place between nanocomposite hydrogel part acting as adsorbent and Ag0-Ag 2 O as photocatalyst. The chemical oxygen demand, effect of scavengers and reusability were also investigated. [ABSTRACT FROM AUTHOR]