Dr. T. Peter Amaladhas

• Ph.D.
• Professor (Associate) at V.O.Chidambaram College, Tuticorin

A R T I C L E I N F O Keywords: CeO2-CePO4 nanocomposites Penaeus semisulcatus Sensing of heavy metals Sun protection factor Cytotoxicity A B S T R A C T CeO2-CePO4 and Ag@CeO2-CePO4 nanocomposites (NCs) were prepared using Penaeus semisulcatus and characterized by various analytical techniques. The NCs exhibited spherical morphology, with average...

Carbon dots are quasi-spherical and zero dimensional nanomaterials with unique optical and electronic properties. In this work, a facile and sustainable strategy was employed to synthesise nitrogen doped carbon dots from Terminalia chebula via hydrothermal treatment with a quantum yield of 19.9%. The structural and optical properties of nitrogen do...

In the present work, a green synthetic method for the preparation of extremely stable silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) using Sargassum ilicifolium has been demonstrated. Thus produced nanoparticles were characterized by UV–Visible (UV–Vis) spectroscopy, Fourier Transform InfraRed spectroscopy (FT-IR), Energy Dispersive X-...

The focus of this work is to use fly ash, a waste generated by thermal power plants, to synthesize an economical and efficient heterogeneous catalyst for the fine chemicals industry. To achieve this goal, fly ash zeolite (FAZ) was prepared from fly ash and Cu(II), Ni(II) and Co(II) complexes of 4-hydroxy-3-methoxybenzaldehyde [M(VAN)-FAZ] were load...

The catalytic activity of CeO2 and palladium nanoparticles supported fly ash zeolite (CeO2/Pd@FAZ) for Csp2−Csp2 bond formation was studied. CeO2/Pd@FAZ was characterized by FTIR, XRD, EDAX and TEM studies. In the Suzuki-Miyaura cross-coupling reaction, biphenyl derivatives with excellent yields were obtained, and the reaction conditions were optim...

A one-step biosynthetic pathway for the fabrication of La2O3–LaPO4 nanocomposites (NCs) was developed, employing Charybdis natator. The structure and phase changes of the NCs were confirmed, and their diverse applications were explored. The peaks at 206, 332, and 442 nm in UV-DRS studies confirmed the formation of La2O3–LaPO4 NCs. Fourier transform...

The current work primarily deals with the synthesis of nitrogen rich carbon dots from Delonix regia along with characterisation using several analytical techniques for fluorescent sensing of Fe(III) and cysteine, electrochemical sensing of hydrogen peroxide and DNA binding. The average particle size of the spherical N-CDs is calculated to be 2.23 n...

Tunable optical and electronic properties of the fluorescent carbon dots have drawn significant research interests over the years mainly owing to their sensing and photocatalytic applications. In this work, highly fluorescent nitrogen doped carbon dots [N−CDs] have been synthesised from Quercus infectoria via hydrothermal treatment. The structural,...

Research on plasmonics and their applications in diverse fields has increased significantly over the last decade. The present work primarily aimed to bio‐fabricate silver and gold plasmonic nanoparticles and to study their potential as photocatalysts and as DNA binders. To achieve this, Ag and Au NPs were derived employing Peristrophe paniculata an...

The deployment of biological resources for the synthesis of nanoparticles of metals and metal oxides is the latest addition to green chemistry. The present work describes the use of aqueous stem extracts of Aristolochia indica and Indigofera tinctoria for the synthesis of silver and gold nanoparticles (Ag and Au NPs). The synthesized NPs were chara...

In this study, the bark of an important medicinal plant, Indigofera aspalathoides is utilized as a bioreductant for the synthesis of silver and gold nanoparticles (Ag and Au NPs). The formation of nanoparticles was monitored and the reaction parameters were optimized by UV-Vis spectroscopy. The attachment of bio-components as stabilizer was proved...

A unique Schiff base ligand 4 applications of the synthesized complexes were carried out by Cytotoxic screening analysis, DNA binding ability by using electronic spectra, and Anti-Tumor activity by MTT assay. The results established that the synthesized transition metal complexes can act as good anti-tumor and anti-dengue agents.

NiO nanoparticles were synthesized by a facile and green biological method using Pisonia alba leaf extract. The biomolecules present in the extract acts as complexing as well as capping agent. The morphological, structural, and optical properties of this catalyst were analyzed using XRD, EDAX, TEM and UV–vis spectroscopy. The photocatalytic degrada...

A neoteric Schiff base ligand, 4-(4-chlorobenzylideneamino)-N-(4-(4-chloro benzylidene amino) phenyl)benzamide (L1), and its Co(II), Ni(II) and Cu(II) complexes were synthesized. The structure of ligand L1 and its complexes were confirmed by NMR, FT-IR, UV-Vis., EPR and EI- mass techniques. The synthesized complexes were docked with human DNA topoi...

Fly ash is a major residue generated from coal fired power plants. Owing to the environmental threats posed by fly ash, several attempts have been made for gainful utilization of fly ash. In this work, the possibility of synthesizing high value added products such as zeolites from fly ash has been explored. Fly ash based zeolite (FAZ) has been synt...

A series of six photo-crosslinkable thermotropic liquid crystalline copolyesters were prepared by polycondensation method at room temperature using tetra-n-butylammonium bromide as the phase transfer catalyst. The diacid chloride involved in this process was adipoyl chloride, the common diol (diol-1), also referred to as bischalcone diol, used was...

Synthesized silver and gold nanoparticles by biosynthesis method, characterized and applied as plasmonic catalyst

Utilization of bioresources for the synthesis of metal nanoparticles is the latest field in green chemistry. The present work reports the utilization of the aqueous bark extract of Plumbago zeylanica for the biosynthesis of Ag and Au NPs. The Ag and Au NPs thus obtained were characterized by UV–Vis, FT-IR, TEM, XRD, and EDAX analysis. The water-sol...

In this article, a new method for the utilization of fly ash has been proposed. X-type zeolite was prepared from fly ash by alkali fusion followed by hydrothermal method. The prepared fly ash based zeolite (FAZ) was characterised using FTIR, XRD, TGA and XRF and from BET analysis the surface area was found to be 172.83 m2/g and the pore volume was...

Solar light induced photo catalysis by plasmonic nanoparticles such as Au and Ag is an important field in green chemistry. In this study an environmental benign method was investigated for the rapid synthesis of colloidal Ag and AuNPs using the extract of Hydrocotyle asiatica, as a reducing and stabilizing agent under sunlight irradiation. The nano...

Sunlight induced strategy for the rapid green synthesis of silver nanoparticles (AgNPs) is reported for the first time using aqueous leaf extract of Achyranthes aspera. On exposing a mixture of silver nitrate solution and aqueous leaf extract of A. aspera to sunlight, stable silver nanoparticles were obtained within few seconds. The water soluble b...

A new route for the utilization of fly ash has been formulated. X-type zeolite has been synthesized from fly ash by alkali fusion followed by hydrothermal treatment. Ascorbic acid was used as a ligand for the synthesis of metal complexes of copper, nickel and vanadium encapsulated in the super cages of fly ash based zeolite (FAZ) by flexible ligand...

Coal fly ash has been used to synthesize X-type zeolite by alkali fusion followed by hydrothermal treatment. The synthesized fly ash based zeolite (FAZ) has been characterized by various analytical techniques. Copper(II), Nickel(II) and Zinc(II) complexes of N,N-ethylenebis (salicylamide) encapsulated in the supercages of FAZ have been prepared by...

In this study Cassia angustifolia (senna) is used for the environmentally friendly synthesis of silver nanoparticles. Stable silver nanoparticles having symmetric surface plasmon resonance (SPR) band centred at 420 nm were obtained within 10 min at room temperature by treating aqueous solutions of silver nitrate with C. angustifolia leaf extract. T...

A series of six copolyesters were synthesized by phase transfer catalyzed condensation of adipoyl chloride with 1, 3-bis(4-hydroxyphenyl)propenone as the common diol (diol-1) and arylidene diols as the varying diols (diol-2). The common diol and the six varying diols were prepared by acid catalyzed Claisen-Schmidt reaction. The synthesized copolyes...

The reaction of peroxomonophosphoric acid and hydrazinium ion in acid perchlorate solutions occurs as per stoichiometry (i), and the rate law (ii) at large [N2H5+], where K′d is the first acid dissociation constant of H3PO5 and k1 and k2 are rate constants found to be 2.6 × 10−4 s−1 and 5.0 × 10−2 M−1 s−1, respectively, at 35°. The reaction is gre...

Electroinitiated polymerization of urethane was carried out using electrolysis of MDI (methylene 4,4′-diphenyl diisocyanate) with polyoxypropylene glycol in dimethyl sulphoxide (DMSO) and dimethylformamide (DMF) in the presence of oxides and chlorides of Zn, Cd, Pb and Sn as supporting electrolytes. These salts also served as complexing agents. The...

The reaction between peroxodiphosphate and ascorbic acid (H2A) in acetate buffers is essentially catalysed by trace metal-ion impurities of CuII and FeIII present in the reagents. Copper(II) has an about ten times larger catalytic activity than FeIII, and the activity is so specific and precise that one can calculate the amount of CuII present in a...