Chetna Ameta

Mohan Lal Sukhadia University · Department of Chemistry

Titanium dioxide or titania has profoundly attracted the academia and industries due to its unique physical and chemical characteristics and diverse applications from solar cells to photocatalysts. The titania thin films have different roles in CdTe, perovskite, dye sensitized and organic solar cells as window/buffer layer, electron transport layer...

The sustainable management of wastewater and the production of clean fuel with a reduced carbon footprint require innovative methods, including photocatalytic degradation of pollutants and hydrogen generation. To achieve this, biosynthesized photocatalysts are necessary, with carbon quantum dots (CQDs) being a promising candidate for achieving this...

The preparation of polyaniline (PANI) and its copolymer with indole involved a chemical oxidative polymerization method, with benzene sulfonic acid (BSA, C6H6O3S) used as a dopant and potassium persulfate (PPS, K2S2O8) as an oxidant. The synthesized compounds underwent characterization using FTIR, 1H-NMR, TGA, and GPC techniques, which allowed the...

This book informs readers about recent advances in graphene carbocatalysis encapsulating the current developments in the syntheses, properties, characterizations, functionalization and catalytic applications of graphene, its derivatives and composites. It serves as a comprehensive primary reference book for chemistry and engineering students who ar...

The study aimed to develop an efficient catalyst, biochar/Fe3O4@SiO2-Ag magnetic nanocomposite, to synthesize bioactive benzylpyrazolyl coumarin derivatives through a one-pot multicomponent reaction. The catalyst was prepared using Ag nanoparticles synthesized with Lawsonia inermis leaf extract and carbon-based biochar obtained through pyrolysis of...

Quantum dots (QDs) are tiny nanometer-sized (2–10 nm) hybrid or pure materials with outstanding novel properties, making them fascinating and emergent candidates for novel and special applications in numerous research fields. As developing members of QDs, carbon (especially, graphene and carbon QDs) and semiconductor QDs have fascinated due to thei...

The sol–gel method was employed for the preparation of both undoped and 1% W + (0.6%, 1%, and 1.4%) S co-doped ZnO nanoparticles using zinc acetate dihydrate (Zn(Ac)2.2H2O), sodium tungstate (Na2WO4.2H2O), and sodium sulfide flakes (Na2S.9H2O) as a precursor of zinc, tungsten, and sulfur. The formation of a hexagonal wurtzite structure was observed...

In this study, a low‐cost and simple Sol‐gel technique has been used for the synthesis of W/Co co‐doped ZnO nanoparticles. XRD examinations demonstrate the hexagonal wurtzite structure. To investigate the morphology of ZnO nanoparticles was demonstrated by using SEM and TEM. EDS and FTIR spectra verify the triumphant doping of the W and Co into the...

Fenton reagent is known for over a hundred years and the role of homogeneous and heterogeneous Fenton degradation in wastewater treatment in removing recalcitrant organic contaminants is well appreciated and extensively explored. Limitations and shortcomings of homogeneous and heterogeneous Fenton degradation hinder the large-scale application of h...

Quantum dots (QDs) or nanocrystals are luminous semiconductors with dimension in the range from 2 to 20 nm. Owing to the unmatched electronic and optical properties, quantum dots notice applications in various domains such as optoelectronics, sensors, photodetection, transistors, LEDs (light‐emitting devices), quantum computing, solar cells, cataly...

A Highly efficient and environmentally friendly route for the one-pot multi-component construction of biologically active pyrazolopyranopyramidine derivatives by the reaction of aromatic aldehydes, hydrazine hydrate, ethyl acetoacetate, and barbituric acid under ultrasound has been evolved. The reaction is promoted by starch@Fe3O4 at room temperatu...

The novel naturally based magnetic biochar/Fe3O4–TiO2 nanocatalyst was developed, characterised, and used to manufacture biologically active dihydropyrano-[2,3-c]-pyrazole [DHPP] derivatives. The one-pot four-component reaction between hydrazine hydrate, malononitrile, ethyl acetoacetate, and various aromatic aldehydes was carried out to synthesize...

The investigation on the degradation of water-soluble dye Brilliant green was done by using [email protected] Water-dissolvable, green incandescent CQDs (carbon quantum dots) were fabricated with a high yield by carbonization of water hyacinth (Eichhornia crassipes) weed for the first time at a mild temperature without using any surface activating...

In this era the requirement for energy is enhancing, therefore, many energy resources are developed among them the emerging third-generation dye-sensitized solar cell is one of the environment-friendly solar cell-based technology. Generally, dye-sensitized solar cells consist of a nanomaterial-based photoanode, dye molecules as an absorber, electro...

Green fluorescent water‐soluble carbon quantum dots (CQDs) of size 6 nm were fabricated by carbonization of pomegranate (Punica granatum) peels at a mild temperature of 160 °C for 12 h. The CuO NRs were prepared by the precipitation method. The formation of CQDs and CuO nanorods (NRs) was confirmed. The chemical composition and morphological featur...

They are sometime identified as zero-dimensional (0D) nanoparticles. These particles have gained much attention in water splitting into hydrogen and oxygen through photocatalytic conversion. CQDs act as semiconductor few nm sizes, due to very small size; their optical and electronic properties (s) differ than larger particles. CQDs particle have hi...

Medicinal herbs are plants utilized for remedial purposes or antecedents of another type of supposed chemo pharmaceutical semi-synthetic. The two types of chemical compounds received from plant sources are primary and secondary metabolites. Although secondary substances assume a significant role in plant protection against microscopic organisms, gr...

The present article carefully reports the influence of post deposition annealing on photophysical properties of titania (TiO2) thin films, which are developed employing the electron-beam deposition technique. The pristine films are annealed at 100 °C, 200 °C, 300 °C in air and vacuum conditions followed by the investigation of photophysical propert...

An efficient, green and rapid protocol for one pot synthesis of substituted imidazoles from isatin, aryl/hetero-aryl aldehydes and ammonium acetate in presence of CuO-TiO2-GO nanocomposite as catalyst under microwave irradiation has been reported in this article. The CuO-TiO2-GO nanocomposite was synthesized by hydrothermal method and characterized...

Graphene oxide (GO) and GO/CuO nanocomposites were synthesized by modified Hummer’s and hydrothermal methods, respectively, and characterized using standard techniques such as TEM, TGA-DTA, UV–Vis DRS, EDS and mapping, FESEM, FTIR, Raman, XRD, BET surface area and PL spectra. The photocatalytic degradation of Azure-B dye was carried to evaluate the...

The notion of click chemistry was introduced in 2001 by Barry Sharpless as a tool for designing new molecular entities. Click chemistry comprises of a class of extremely efficient, selective, and authentic reactions which involve ligation of two or more diversely functionalized moieties under benign reaction conditions for the expeditious synthesis...

The titania films have potential to work as an electron transport layer in perovskite and optical window layer in Cd-based solar cells, therefore in this letter, we vigilantly report the influence of different vacuum annealing levels on properties of titania thin films. The titania films are developed by e-beam evaporation and post-annealed at 200°...

Titanium dioxide (TiO2) based thin films are very promising due to their potential applications in thin film based dye-sensitized, perovskite and Cd-based solar-cells, therefore, air and vacuum annealing evolution to physical properties of compact TiO2 films is undertaken. Thin films of thickness 50 nm were grown employing electron-beam deposition...

In the present paper, a novel and benign protocol for microwave enhanced one pot syntheses of 2,3‐dihydro‐1,5 benzodiazepine derivatives from substituted acetophenones, aryl‐aldehydes and o‐phenylene diamine using heterogeneous calcium ferrite/graphene oxide (CF/GO) nanocomposite has been reported. The catalyst was prepared by ultrasonication metho...

As the textile industries use aqueous method for dyeing processes, the color that is released in the environment is associated with the incomplete absorption of dyes on fibres. So, there is a strong need to reduce the amount of residual dye in textile effluent. Large amounts of liquid wastes are produced from textile industries that contain both or...

The current research focuses on the photocatalytic, sonocatalytic and sonophotocatalytic degradation of nigrosine dye with nitrogen-doped and undoped zinc oxide powders. The sonophotocatalytic degradation of dye was found to occur at a higher rate than during photo or sonocatalytic processes. Nitrogen-doped and undoped zinc oxide powders were synth...

Life of living or non-living being depends on water; in short, water is life. But these days, with the growing industrialization, it is spoiling a lot. Wastewater contains contaminants like acids, bases, toxic organic and inorganic dissolved solids, and colors. Out of them, the most undesirable are colors caused mainly by dyes. Color and other comp...

Abstract: Aim and Objective: Benzodiazepines and indole fused heterocycles are pharmacologically significant scaffolds. Trivial work on indole fused benzodiazepine compounds is reported in the literature. Hence, it is imperative to explore the synthesis of indole-fused benzodiazepines that may act as a template for biological studies in the future....

Pyrazolopyrimidines constitute a medicinally important class of heterocyclic compounds. Herein, we report an efficient and environmentally benign method for the synthesis of pyrazolo[3,4‐d]pyrimidin‐3‐ones from 2,4‐dinitrophenylhydrazine and diethyl malonate under microwave irradiation in 1,3‐dibutylimidazolium bromide ionic liquid. The synthesized...

Graphene-based carbocatalysts owing to numerous amazing properties such as large specific surface area, high intrinsic mobility, excellent thermal and electrical conductivities, chemical stability, ease of functionalization, simple method of preparation, effortless recovery and recyclability have gained a superior position amongst the conventional...

Oligoaniline (OANI) was prepared using chemical oxidative method using ascorbic acid as a dopant and ammonium persulfate as an oxidant. As-synthesized OANI was subjected for the preparation of various drug composites. All the synthesized compounds were characterized by FTIR, ¹HNMR, TGA, GPC, etc. The thermal stability of the compounds was determine...

Polyaniline (PANI) and its drug composites with some drugs like Neomycin (NM), Trimethoprim (TMP) and Streptomycin (ST) have been prepared by oxidative polymerization of aniline using hydrochloric acid (HA) and ammonium persulfate (APS) as a dopant and as an oxidant, respectively. The structures of PANI and PANI-drug composites were elucidated by F...

Nano rods like N-doped ZnO structures have been prepared using microwave-assisted method. Synthesized nanoparticles have been characterized by Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX), Fourier-transform Infrared Spectroscopy (FTTR) and ultravi...

The Schiff base ligands 1-(2-furanyl) ethanone isonicotinoylhydrazone (L ⁵ H), 1-(2-thienyl)ethanone isonicotinoylhydrazone (L ⁶ H), 1-(2-pyridyl)ethanone isonicotinoylhydrazone (L ⁷ H), 1-(2-naphthyl)ethanone isonicotinoylhydrazone (L ⁸ H), were prepared by the condensation reaction of isonicotinic acid hydrazide with corresponding ethanons in 1:1...

Carbamazepine is an anticonvulsant is used to treat partial seizures, tonic-clonic seizures, pain of neurologic origin such as trigeminal neuralgia, and psychiatric disorders including manic-depressive illness and aggression due to dementia. Validation of stability indicating Simple, Specific, Precise, Accurate, Linear, Rugged, Robust High Performa...

Conducting polymers offer certain advantages over nonconductive biopolymers in that their physical characteristics and conductive properties can be manipulated either chemically or electrochemically. Many cells (cardiac) functions as cell attachment, proliferation, and migration may be modulated by electrical stimulation. The most widely studied co...

The emerging importance of sonochemistry as "green" process and ionic liquids (ILs) as "green" materials with their wide applications are rapidly increasing. Imidazolium-based ionic liquid derivatives are synthesized using a facile and green ultrasound-assisted procedure. Their structures were characterized by IR, 1H-NMR, 13C-NMR and Mass spectrosc...

Revolution in organic compound synthesis has been promoted by microwave-assisted organic syntheses (MAOS) by which small molecules are built up into large polymers in a fraction of time. Ionic liquids (ILs), considered being a relatively recent magical chemical due to their unique properties, have a large variety of applications in all areas of the...

In the present work, photocatalytic degradation of methylene blue has been carried out using naïve titanium dioxide, nano-sized titanium dioxide and H2O2 under visible light. The catalysts, naïve and nano-sized titanium dioxide were prepared by sol-gel method. Characterization of synthesized catalysts has been done by scanning electron microscopy (...

Aurones [2-benzylidenebenzofuran-3(2H)-ones] are natural as well as synthetic compounds, belonging to the flavonoid family. They are isomeric to flavones and provide a bright yellow colour to the plants in which they occur. Flavonoids have been studied not only for their physiological properties and effects on nature, but also for their therapeutic...

An efficient and mild synthesis of some diverse iminosaccharides of pyrazole has been carried out. Compounds (8a-b) have been synthesized by the treatment of isoniazide with chalcones (6a-b) using [bbim][BF4] ionic liquid as a solvent under microwave irradiation. Compounds (8a-b) on reaction with various aldoses afforded corresponding iminosacchari...

Methyl violet–substituted polyaniline is prepared by oxidative polymerization of aniline in an aqueous acidic media using tosic acid as dopant and ammonium persulphate as oxidant. Substitution of methyl violet (dye moieties) on polyaniline backbone takes place in the presence of butyl lithium. The structures of methyl violet–substituted polyaniline...

Water is the nature's solvent and all biological syntheses are being carried in aqueous medium. It is an essential element of life on our planet. Water possesses unique structural form, which bestows distinguished physical and chemical properties. It exhibits powerful hydrogen bonding, large dielectric constant, high heat capacity, as well as a bro...

Heterogeneous catalysis refers to the form of catalysis where the phase of the catalyst differs from that of the reactants. '‘Phase’’ here refers not only to solid, liquid, and gas, but also immiscible liquids, for example, oil and water. The great majority of practical heterogeneous catalysts are solids and the great majority of reactants are gase...

MW assisted synthesis of pyrazoles containing benzotriazole moieties 4a-n has been achieved by cyclocondensation of substituted chalcones 3a-n with hydrazide of benzotriazole 2 in presence of glacial acetic acid (GAA). Thus, synthesized compounds 4a-n have been characterized by their spectral data and evaluated for their antibacterial and antifunga...

The large-scale production of chemicals to meet various societal needs has created environmental pollution, including pollution from byproducts and improper disposal of waste. With the world facing adverse consequences due to this pollution, green chemistry is increasingly being viewed as a means to address this concern. Since most organic synthese...

An environmentally benign, efficient and facile route is developed for the preparation of phthalimidc derivatives by using LiBr as a catalyst under solvent free condition and microwave exposure. In comparison to conventional synthesis involving tedious workup, excessive use of solvent and extra labour for separation and purification of compounds, t...

An efficient, fast and eco-friendly method for synthesis of some derivatives of 2-mercaptobenzothiazole under MW induced solvent free condition has been reported. LiBr acts as a catalyst for the condensation reactions. The structures of all the synthesized compounds have been elucidated on the basis of elemental analyses and spectral data. Some of...

Synthesis of triazole derivatives from 2-mercaptobenzothiazole has been achieved in four steps under microwave irradiation. LiBr potentially replace solvents and corrosive acids in this reaction scheme. The products of triazole derivatives have shown antimicrobial activity.

Two rapid and efficient methods for the preparation of fused thiazoloquinazoline derivatives by the reaction of chalcones with hydroxylamine, urea and hydrazine hydrate under solvent free condition and microwave exposure are reported. The aim of present work is to substitute toxic, dangerous, highly reactive chemicals with less reactive, less harmf...

The charge transfer (CT) complex of p-toluidine - chloranil (CA) was prepared by solution growth and microwave techniques and characterized by elemental analysis, UV-Vis, IR and 'H NMR spectroscopic data. The data obtained indicated the formation of the CT complex having 1:1 stoichiometry. It indicates that the charge transfer interaction is associ...