Jyothi M.s.

Chulalongkorn University · Faculty of Science

The geometric stability and electronic properties of cubic silicane (c-Si12) nanosheet (hydrogenated silicene) are studied based on the first-principles studies. The c-Si12 monolayer nanosheet possesses an energy band gap of 2.259 eV. We deployed the semiconductor c-Si12 nanosheet as a sensing base material for 2,2-dimethylbutane, 2-methylhexane mo...

Quantum dots (QDs) are potential agents for solar energy conversion due to their size-dependent optoelectronic properties. QD-sensitized solar cells (QDSSCs) are potential candidates to meet the growing demand for clean energy due to facile and low-cost fabrication techniques. High performance is expected in this type of solar cell architecture due...

Recently-two-dimensional (2D) materials are used for various applications due to their fascinating properties. One among 2D materials is θ-arsenene nanosheet (θ-AsNS). The stability of θ-AsNS is confirmed and the energy band gap of 1.422 eV is observed indicating semiconductor nature. θ-AsNS is used to adsorb aniline and chlorobenzene vapours. The...

The monitoring of toxic vapours such as M-cymene and m-xylene from industries is a significant task using a solid-state chemical sensor. We report the structurally stable hex-star arsenene sheets (hex-star AsNS) as a base material to perceive the presence of M-cymene and m-xylene molecules. Initially, we examined the formation energy of hex-star As...

Two halomethanes, chloromethane and bromomethane are selected as target molecules to adsorb on hex-star phosphorene nanoribbons (hex-star PNR). The target contaminants are widely used in several industrial applications, which are hazardous too. The current work explores the effectiveness of hex-star PNR for the detection of halomethanes via density...

The current work explores the adsorptive efficiency of carbon nanospheres (CNSs) derived from oil palm leaves (OPL) that are a source of biowaste. CNSs were synthesized at 400, 600, 800 and 1000 °C, and those obtained at 1000 °C demonstrated maximum removal efficiency of ~91% for malachite green (MG). Physicochemical and microscopic characteristics...

Biowaste-derived carbon biomaterial scaffolds are being used for wound healing and are the focus of interest. Carbon nanospheres derived from oil palm leaves without any catalysts via pyrolysis were loaded with a traditional drug curcumin. The wound healing scaffolds were fabricated on the PP non-woven fabric support using chitosan as the biopolyme...

The structural stability of novel ζ-arsenene nanotubes (ζ-AsNT) is studied based on the density functional theory framework and is used as a base material for the detection of trichloroethylene and tetrachloroethylene vapours. The formation energy of ζ-AsNT is found to be −4.321 eV/atom and the energy band gap is 0.304 eV. Besides, the changes in t...

Biowaste derived carbon and the biomaterial scaffolds are being used for wound healing are the focus of interest. Carbon nanospheres derived from oil palm leaves without any catalysts via pyrolysis were loaded with a traditional drug curcumin. The wound healing scaffolds were fabricated on the polypropylene non-woven fabric support using chitosan a...

The allotrope of phosphorous, namely violet phosphorene (violet PNS) is investigated for the possible application as a chemical nanosensor. Initially, the stability of violet PNS is studied from the formation energy, which is observed to be -5.311 eV/atom confirming the stable geometry of violet PNS. The violet PNS is used as a base material to ads...

The pnictogen monolayers are the emerging field in this decade towards environmental remediation. Concerning the same, γ-arsenene nanosheets (γ-AsNS) are studied for their structural stability, electronic properties via density functional theory framework. The adsorption of herbicides, such as atrazine, and diuron on γ-AsNS under aqueous conditions...

This chapter presents the background and contemporary research accomplishments dealing with smart architectural devices, photovoltaics. The evolution of photovoltaic devices, developments with open challenges, and future opportunities are analyzed and elaborated along with their response characteristic models and variations in graphical analysis. T...

Of all the quantum dots, CsPbBr3 perovskite quantum dots (CPQDs) have been extensively studied for sensing and photocatalysis because of their desired photophysical properties such as optical absorption, high quantum yield and narrow emission bands. However their photo, thermal and aqueous instability has limited their use in real time applications...

Building compatible surface on perovskite quantum dots (PQDs) for applications like sensing analytes in aqueous medium is highly challenging and if achieved by simple means can revolutionize disease diagnostics. In this context, this work reports the surface engineering of CsPbBr3 QDs via “simple ligand exchange process” to achieve water-compatible...

The potential of filter paper as a substrate material and 4-aminophenyl sulfone (APS) as a novel monomer for TFC fabrication is explored for the first time. A novel polyamide selective layer was developed using APS and trimesoyl chloride by interfacial polymerization, whereas the control TFC was prepared by replacing APS with m-phenylenediamine. Fo...

Use of biomaterial scaffolds as drug carriers for infected wounds treatment is of wide scope. A series of curcumin/TiO2 complex loaded chitosan scaffolds are fabricated for the same. Synthesized wound dressing material is screened for their morphology, water absorption capacity; in vitro drug release patterns, in vitro antibacterial studies against...

The study demonstrates the preparation of MnFe2O4 impregnated chitosan-microspheres (CMMS) as adsorbents for efficient removal of cationic thiazine dye, methylene blue. A facile approach with great economic and technical advantages to obtain highly crystalline manganese ferrite nanoparticles by solution combustion method is accounted. CMMS were cha...

A novel polymer poly(4,4′‐biphenylene sulfonyl succinamide) (PBSS) was synthesized via polycondensation reaction. Succinyl chloride and 4‐aminophenyl sulfone were used as reactive monomers and anhydrous AlCl3 was used as a catalyst. Both polysulfone (PSf) and PBSS were dissolved in N‐methyl‐2‐pyrrolidone (NMP) at different compositions to obtain a...

Organic contaminants (textile dyes, pesticides) in industrial wastewater have adverse effects on the environment and human health. Such environmental pollutants are resistant in the environment and are difficult to completely remove through treatment techniques. Therefore, titanium dioxide (TiO2) nanostructure-based photocatalytic processes have re...

Alcohols are the essential chemicals used in a variety of pharmaceutical and chemical industries. The extreme purity of alcohols in many of such industrial applications is essential. Though distillation is one of the methods used conventionally to purify alcohols, the method consumes more energy and requires carcinogenic entertainers , making the p...

The generation of hydrogen and oxygen from the photocatalytic water splitting reaction under visible light is a promisingly renewable and clean source for H 2 fuel. The transition metal oxide semiconductors (e.g. TiO 2 , WO 3, ZnO, and ZrO 2 ) are have been widely used as photocatalysts for the hydrogen generation. Because of safety, low cost, chem...

Inorganic metal oxide semiconductor-based photocatalyst plays key role in the photocatalytic process for applications such as environmental pollution (air and water) and hydrogen generation, due to their physico-chemical and photocatalytic properties. However, they are only active under ultraviolet irradiation, and it is a major drawback of oxide-b...

This study demonstrates the caramel as a hydrophilic additive material towards improving the performance and antifouling properties of Polysulfone (PSF) membranes. It is found that the functional molecules that formed upon the caramelization of sugar enhance the performance of the PSF membranes in terms of their permeability as well as the hydrophi...

The future of third generation Quantum dot sensitized solar cells (QDSSCs) can be optimistic if concerns of charge recombination and stability of cells can be worked upon. In this work, we report the role of Graphene materials in its different dimension in overcoming recombination and enhancing power conversion efficiency (PCE). Composite of Graphe...

A required progress in developing effective membranes for diffusion dialysis provides a platform to explore novel hybrid membranes for acid recovery. This novel study investigated a feasibility of egg shell membrane powder in enhancing proton permeability of polysulfone membrane, thereby promoting a sustainable development in acid recovery. Hybrid...

Current world faces alarming challenges of heavy metal contamination, which are hazardous to human and environment because of their toxicity even in trace concentration. Lead is one of the harmful heavy metal contaminant and has poisonous effect on human health. The present research investigation describes the adsorption of toxic Pb (II) on an immo...

The study reports the use of a novel membrane for heavy metal removal and salt rejection. Poly isobutylene alt maleic anhydride (PIAM) modified by sulfanilic acid is blended with polysulfone (PSf) in different concentrations. This induces surface charge and hydrophillicity in the otherwise hydrophobic PSf membranes. The so modified polymers and the...

Hydrophobic polysulphone (PSf) was reformed into a hydrophilic polymer by sulphonation (via electrophilic substitution) and was subsequently made into a composite by incorporating nano titania to reduce Cr (VI) in the concentrated feed to Cr (III), thus eliminating the hazards of Cr (VI). The modified polymer and its composites were characterized b...

The report aims to develop and use sunlight-active catalyst-membrane to reduce toxic Cr (VI) to less toxic Cr (III) and to reject Cr (III) from Cr contaminated water. Polysulfone and TiO2 nanoparticles were hybridized, to induce a bifunctional efficacy of metal ion reduction and separation. Reduction of Cr (VI) results in the formation of Cr (III),...

Herein, an attempt has been made to prepare a novel membrane with good efficiency for removal of heavy metal ions namely lead (Pb), cadmium (Cd) and chromium (Cr). 4-amino benzoic acid (ABA) was covalently grafted onto the poly vinyl chloride (PVC) backbone by C-N bond to enhance the hydrophilicity. ¹H NMR and ATR-IR spectroscopy analysis confirmed...

Near-complete removal of heavy metals, namely Cd(II), Cr(VI) and Pb(II), has been attempted by a membrane purification process using a blend of modified polyvinyl chloride (PVC) and polysulfone (PSf), prepared by the diffusion induced phase separation (DIPS) method. The prepared novel material was characterized by NMR, ATR-IR spectroscopy and DSC....

This study reports removal of oxybenzone from TiO2 nanoparticles and those incorporated mixed matrix membrane. Polysulfone and TiO2 nanoparticles mixed matrix membrane were prepared by Diffusion Induced Phase Separation (DIPS) method. The TiO2 nanoparticles and membranes were characterized by XRD, SEM, TEM, Raman spectroscopy and FESEM techniques;...

A hydrophobic, ultrafiltration (UF), polysulfone (PSf) was reformed into a hydrophilic polymer by introducing amine groups via chemical modification. The amination was achieved by nitration to PSf followed by reduction using Na2S2O4. The modified polymer (aPSf) was characterized by NMR spectroscopy, ATR-IR, DSC and TGA. aPSf was further made into a...

Herein we present a new approach for the complete removal of CrVI species, through reduction of CrVI to CrIII, followed by adsorption of CrIII. Reduction of chromium from water is an important challenge, as CrIV is one of the most toxic substances emitted from industrial processes. Chitosan (CS) thin films were developed on plain polysulfone (PSf)...

The study demonstrates the 100% repeated recyclability of hybrid membranes without any pretreatment. Composite membranes designed with titanium dioxide (TiO2) nanoparticles (NPs) and polysulfone (PSf) membranes were used for reduction of chromium (Cr) (VI) to Cr (III) under sunlight. Different concentrations of TiO2 NPs varying from 1.5% to 2.5% wi...

A photoactive float was fabricated with the modified titania to cause a feasible disinfection of water, contaminated with E.coli. The commercially available titania was doped with neodymium by pulverization technique to enhance its activity in sunlight and a multi approach technique was used to evaluate the extended efficiency of the doped sample....