scholarly journals Dual Functional S-Doped g-C3N4 Pinhole Porous Nanosheets for Selective Fluorescence Sensing of Ag+ and Visible-Light Photocatalysis of Dyes

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 450 ◽  
Author(s):  
Abhijit Kadam ◽  
Md. Moniruzzaman ◽  
Sang-Wha Lee
Keyword(s):  
Visible Light ◽  
Porous Structure ◽  
Active Sites ◽  
Limit Of Detection ◽  
Low Cost ◽  
Environmental Safety ◽  
Cationic Dyes ◽  
Visible Light Photocatalysis ◽  
Fluorescence Sensing ◽  
Vis Spectroscopy

This study explores the facile, template-free synthesis of S-doped g-C3N4 pinhole nanosheets (SCNPNS) with porous structure for fluorescence sensing of Ag+ ions and visible-light photocatalysis of dyes. As-synthesized SCNPNS samples were characterized by various analytical tools such as XRD, FT-IR, TEM, BET, XPS, and UV–vis spectroscopy. At optimal conditions, the detection linear range for Ag+ was found to be from 0 to 1000 nM, showing the limit of detection (LOD) of 57 nM. The SCNPNS exhibited highly sensitive and selective detection of Ag+ due to a significant fluorescence quenching via photo-induced electron transfer through Ag+–SCNPNS complex. Moreover, the SCNPNS exhibited 90% degradation for cationic methylene blue (MB) dye within 180 min under visible light. The enhanced photocatalytic activity of the SCNPNS was attributed to its negative zeta potential for electrostatic interaction with cationic dyes, and the pinhole porous structure can provide more active sites which can induce faster transport of the charge carrier over the surface. Our SCNPNS is proposed as an environmental safety tool due to several advantages, such as low cost, facile preparation, selective recognition of Ag+ ions, and efficient photocatalytic degradation of cationic dyes under visible light.

scholarly journals Visible-Light Photocatalysis: A Low-Cost Metal-Free Photocatalyst Based on Black Phosphorus (Adv. Sci. 1/2019)

2019 ◽  
Vol 6 (1) ◽  
pp. 1970007
Author(s):  
Min Wen ◽  
Jiahong Wang ◽  
Ruifeng Tong ◽  
Danni Liu ◽  
Hao Huang ◽  
...  
Keyword(s):  
Visible Light ◽  
Low Cost ◽  
Black Phosphorus ◽  
Visible Light Photocatalysis ◽  
Metal Free

scholarly journals Synthesis, Characterization, and Photocatalytic Activity of g-C3N4/GaN-ZnO Composite

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Nguyen Ha Trang ◽  
Tran Thi Viet Ha ◽  
Nguyen Minh Viet ◽  
Nguyen Minh Phuong
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Recombination Rate ◽  
Active Sites ◽  
High Stability ◽  
Low Cost ◽  
Charge Carriers ◽  
Strong Reduction ◽  
Ft Ir ◽  
Antibiotic Residue

Recently, photocatalysis process has shown great potential as a low-cost, environmentally friendly, and sustainable method for the water/wastewater treatment. Among that, g-C3N4 is one of the most promising photocatalyst and widely used for a variety of applications. In spite of some unique features such as strong reduction ability, active under visible light, nontoxic, and high stability, g-C3N4 photocatalytic capability under visible light is limited due to fast recombination rate of reactive charges. To deal with this issue, in this study, g-C3N4 is combined with GaN-ZnO for reducing the recombination rate of charge carriers and increasing the active sites. The g-C3N4/GaN-ZnO composite was characterized by several methods such as SEM, EDX, XRD, FT-IR, UV-Vis, and BET. It is also observed that the composite with outstanding features can work effectively under visible light; thus, it is likely to be widely applied in environment treatment, especially in antibiotic residue with more than 90% of tetracycline was decomposed after 3 hours.

scholarly journals Surface-modified Colloid CdTe/CdS Quantum Dots by a Biocompatible Thiazolidine Derivative as Promising Platform for Immobilization of Glucose Oxidase: Application to Fluorescence Sensing of Glucose

2021 ◽  
Author(s):  
Rahman Hallaj ◽  
Zahra Hosseinchi
Keyword(s):  
Quantum Dots ◽  
Glucose Oxidase ◽  
Limit Of Detection ◽  
Low Cost ◽  
Fluorescence Emission ◽  
Cds Quantum Dots ◽  
Fluorescence Sensing ◽  
Experimental Conditions ◽  
Glucose Determination ◽  
Cds Qds

Abstract This work focuses on the synthesis of novel modified core-shell CdTe/CdS quantum dots (QDs) and develops as a fluorescence sensor for glucose determination. The (E)-2,2'-(4,4'-dioxo-2,2'-dithioxo-2H,2'H-[5,5'-bithiazolylidene]-3,3'(4H,4'H)-diyl)bis(3- mercaptopropanoic acid) (DTM) as a new derivative of thiazolidine was synthesized and characterized and used to surface-modification of CdTe/CdS QDs. DTM-capped CdTe/CdS QDs used to immobilization of glucose oxidase (GOD). The intensity fluorescence emission of the CdSe/CdS-DTM/GOD is highly sensitive to the concentration of H2O2 as a byproduct of the catalytic oxidation of glucose. The experimental results showed that the quenched fluorescence was proportional to the glucose concentration within the range of 10 nM − 0.32 µM under optimized experimental conditions. The limit of detection of this system was found to be 4.3 nM. Compared with most of the existing methods, this newly developed system possesses many advantages, including simplicity, low cost, and good sensitivity.

scholarly journals Green Method Synthesised Graphene-Silver Electrochemical Nanobiosensors for Ethambutol and Pyrazinamide

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 879
Author(s):  
Rachel Fanelwa AjayI ◽  
Siphokazi Tshoko ◽  
Yonela Mgwili ◽  
Siphamandla Nqunqa ◽  
Takalani Mulaudzi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Limit Of Detection ◽  
Low Cost ◽  
Ag Nps ◽  
Green Method ◽  
Tb Treatment ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
P450 2D6

A novel nanobiosensor was constructed with graphene oxide (GO) sheets coupled to pear extract-based green-synthesised silver nanoparticles (Ag-NPs) to which cytochrome P450-2D6 (CYP2D6) enzyme was attached. The biosensor was applied in the electrochemical detection of the tuberculosis (TB) treatment drugs, ethambutol (EMB) and pyrazinamide (PZA). The surface morphology of the green-synthesised nanocomposites was studied by performing High-Resolution Transmission Electron Microscopy (HR-TEM) and High-Resolution Scanning Electron Microscopy (HR-SEM). Fourier Transform Infrared Spectroscopy (FTIR) and Raman Spectroscopy were used for structural analysis, while Ultraviolet Visible (UV-Vis) Spectroscopy was used in the optical characterisation of the nanocomposite material. Electrochemical studies on glassy carbon electrode (GCE), which were done by Cyclic Voltammetry (CV), showed that the GO|Ag-NPs||GCE electrode was highly conductive, and thereby indicating its suitability as a platform for nanobiosensor development. The non-toxic and low-cost green GO|Ag-NPs|CYP2D6||GCE nanobiosensor was used to determine EMB and PZA. The very low limit of detection (LOD) values of the biosensor for EMB (0.2962 × 10−2 nM, S/N = 3) and PZA (0.897 × 10−2 nM, S/N = 3) demonstrate that the green nanobiosensor is more sensitive than other biosensors reported for EMB and PZA.

scholarly journals Band Gap Tuning of Photo Fenton-like Fe3O4/C Catalyst through Oxygen Vacancies for Advanced Visible Light Photocatalysis

2021 ◽  
Author(s):  
Muthaimanoj Periyasamy ◽  
Sumanta Sain ◽  
Moumi Mandal ◽  
Utsav Sengupta ◽  
Sudipta Mukhopadhyay ◽  
...  
Keyword(s):  
Visible Light ◽  
Band Gap ◽  
Iron Ore ◽  
Oxygen Vacancies ◽  
Reduction Method ◽  
Low Cost ◽  
Visible Light Photocatalysis ◽  
Iron Precursor ◽  
Band Gap Tuning ◽  
Hydrothermal Reduction

In this contribution, low-cost Fe3O4/C nanocomposites has been targeted by a simplistic single-pot D-glucose mediated hydrothermal reduction method using a single iron precursor (FeCl3. 6H2O) acquired from accumulated iron ore...

Bio-templated fabrication of metal-free boron carbonitride tubes for visible light photocatalysis

2017 ◽  
Vol 53 (88) ◽  
pp. 11988-11991 ◽  
Author(s):  
Liuyong Chen ◽  
Xinchen Wang
Keyword(s):  
Visible Light ◽  
Carbon Nitride ◽  
Low Cost ◽  
Light Illumination ◽  
Visible Light Photocatalysis ◽  
Boron Carbonitride ◽  
Visible Light Illumination ◽  
Kapok Fibers ◽  
Boron Carbon Nitride ◽  
Boron Carbon

A novel and facile biotemplating method has been presented to synthesize boron carbon nitride tubes (BCNTs) by using the low-cost kapok fibers (KFs). This pathway not only transplanted the structure of KFs into the h-BN lattice, but also introduced C simultaneously in a self-doping manner. The BCNT photocatalysts can catalyse hydrogen evolution from water under visible light illumination.

Silver Decorated Carbon Nanospheres as Effective Visible Light Photocatalyst

2013 ◽  
Vol 1509 ◽  
Author(s):  
W. Armstrong ◽  
B. Sapkota ◽  
S. R. Mishra
Keyword(s):  
Silver Nanoparticles ◽  
Visible Light ◽  
Amorphous Carbon ◽  
Uv Light ◽  
Low Cost ◽  
Hollow Spheres ◽  
Weight Ratio ◽  
Carbon Nanospheres ◽  
Visible Light Photocatalyst ◽  
Vis Spectroscopy

AbstractThe objective of this study was to assess usability of silver nanoparticles loaded on amorphous carbon (Ag-C) hollow nanospheres for the removal of Methylene Blue (MB) molecules from aqueous solutions. Using microwave technique, silver nanoparticles of different weight ratio was deposited onto amorphous carbon templates. The carbon hollow spheres were derived from glucose using hydrothermal technique. Interestingly crystallite size of Ag decreased with the silver loading on carbon nanospheres. Using UV-vis spectroscopy, the kinetics of MB removal from the solution was assessed. The degradation of MB followed pseudo-first-order kinetics. The obtained results showed that Ag-C particles are efficient MB degradation agent with the rate constant as high as 0.19 m-1 under visible light and 0.041 m -1 under UV light. Thus Ag-C particles are good alternative as low-cost scavenger of dye molecules in wastewater treatments.

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