No abstract

Semiconductor materials have been shown to have good photocatalytic behavior and can be utilized for the photodegradation of organic pollutants. In this work, three-dimensional flower-like SnS2 (tin sulfide) was synthesized by a facile hydrothermal method. Core-shell structured SiO2@α-Fe2O3 nanocomposites were then deposited on the top of the SnS2 flowers. The as-synthesized nanocomposites were characterized by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–Vis Spectroscopy, Brunauer–Emmett–Teller (BET) surface area analysis, and photoluminescence (PL) spectroscopy. The photocatalytic behavior of the SnS2-SiO2@α-Fe2O3 nanocomposites was investigated by observing the degradation of methylene blue (MB). The results show an effective enhancement of photocatalytic activity for the degradation of MB especially for the 15 wt % SiO2@α-Fe2O3 nanocomposites on SnS2 flowers.

2019)Novel electrochemical synthesis of cellulose microfiber entrapped reduced graphene oxide: A sensitive electrochemical assay for detection of fenitrothion organophosphorus pesticide. Talanta, Downloaded from: http://e-space.mmu.ac.uk/622103/ Publisher: Elsevier AbstractOver the past decades, synthesis of carbohydrate polymers incorporated graphene or reduced graphene oxide has received greater attention in different disciplines owing to their unique physicochemical properties.In this context, we report a facile electrochemical synthesis of cellulose microfibers supported reduced graphene oxide and its application towards enhanced and lower potential electrochemical detection of fenitrothion. The synthesized cellulose microfibers supported reduced graphene oxide composite was further characterized using Fourier-transform infrared spectroscopy, Raman spectroscopy and high resolution scanning electron microscopy. Cyclic voltammetry studies reveal that cellulose microfibers supported reduced graphene oxide composite modified screen-printed carbon electrode exhibits a superior electroreduction ability and lower reduction potential towards fenitrothion compared to screen-printed carbon electrodes modified with graphene oxide, graphene oxide-cellulose microfibers, and reduced graphene oxide.Furthermore, cellulose microfibers supported reduced graphene oxide composite modified electrode showed 141 mV lower reduction potential towards fenitrothion than the chemically reduced graphene oxide-cellulose microfibers composite modified screen-printed carbon electrode. The effect of accumulation time, catalyst loading, scan rate and pH for the detection of fenitrothion has been studied and discussed. Differential pulse voltammetric studies show that the fabricated composite electrode can detect the fenitrothion in a wider linear response range up to 1.134 mM with a detection limit of 8 nM. To validate the proof of concept, the fabricated sensor was successfully applied for the detection of fenitrothion in different water samples.

Craig E (2019)Facile synthesis of cellulose microfibers supported palladium nanospindles on graphene oxide for selective detection of dopamine in pharmaceutical and biological samples. Materials Science and Engineering: C, 98. pp. 256-265.

No abstract

No abstract

Zinc and sulfur codoped iron oxide nanocubes on functionalized multiwalled carbon nanotubes (Zn@S-FeNC/f-CNTs) were synthesized by a conventional hydrothermal (HT) route followed by ultrasonication, and the synthesized nanocomposites were used for the sensitive and selective detection of isoniazid (INZ). The morphological, structural, and electrochemical properties of the composite were well characterized. The application of the screen-printed carbon electrode modified with Zn@S-FeNC/f-CNT for the detection of antibiotic drug INZ (for the treatment of tuberculosis, TB) by employing voltammetric and amperometric techniques. The composite served as an outstanding electron (e − )-transfer mediator for INZ oxidation. Under optimum conditions, the modified electrode showed a distinct response for voltammetric and amperometric analyses toward INZ detection, yielding low detection limits of 5.01 and 8.54 nM, respectively. The calculated charge-transfer rate constant (k s ) was 1.6 × 10 −6 cm s −1 , while the electrochemical active surface area was estimated to be 0.157 cm 2 . The fabricated sensor exhibited good selectivity, long-term stability, and high reproducibility. The sensor has been further used to examine human serum and urine samples with good recovery.

No abstract