Publications

Novel polybenzoxazine-based arylidene moiety modified cellulose acetate for enhanced antifouling properties

Abstract Marine fouling is a widespread problem in the maritime industry, causing significant damage to equipment and vessels. Polybenzoxazine (PBz) is a resin that is both remarkable and captivating, and it has a wide range of sophisticated uses. Due to their distinctive characteristics, benzoxazines have sparked the interest of scholars globally. However, most benzoxazine resin production and processing depend on petroleum resources, particularly those based on bisphenol A. This study aimed to create new benzoxazine monomers using bio-based raw materials, primarily motivated by the environmental ramifications. The main goal of this study is to synthesize a benzoxazine molecule, specifically (2E,6E)-2,6-bis(3-(2-hydroxyethyl)-3,4-dihydro-2H-benzo[e][1,3]oxazin-6-yl)methylene) cyclohexane-1-one, abbreviated as (CHPE), by employing an arylidene base. Later, the chemical was used as a modifier for the cellulose acetate (CA) matrix to create film samples. The primary objective is to evaluate the effectiveness of these film samples in preventing fouling. The CHPE molecule was produced using a bis(arylidene) cyclohexanone diol and analyzed using Fourier transform infrared (FTIR) and Nuclear magnetic resonance (NMR) spectroscopic techniques, respectively. The films were fabricated by blending various weight proportions. The composition of the (CHPE-CA) films was determined by FTIR analysis, while their morphology was examined using scanning electron microscopy (SEM). The thermal stability of the films was studied using Thermal Gravimetric Analysis (TGA). This study investigated the antifouling properties of polymer sheet compositions containing varying amounts of CA at two different processing temperatures, 180 °C and 200 °C and without curing. The results demonstrated the potential of incorporating CA into the polymer matrix to enhance antifouling performance. Among the polymer compositions tested, the 20% CA composition exhibited the highest percentage reduction in fouling at both processing temperatures, suggesting that a small amount of CA can contribute to effective antifouling properties.

Extraction and characterization of natural lignocellulosic fibres from Typha angustata grass

Development of Hg²⁺ sensor based on N′-[1-(pyridin-2-yl)ethylidene]benzenesulfono-hydrazide (PEBSH) fabricated silver electrode for environmental remediation

<italic>N</italic>′-[1-(Pyridin-2-yl)ethylidene]benzenesulfonohydrazide (PEBSH) was synthesized <italic>via</italic> a simple condensation of 2-acetyl pyridine and benzene sulfonyl hydrazide in very good yield and crystallized, and then used in the formation of a Hg²⁺ sensor.

Photophysical parameters and laser activity of 3(4-dimethylamino-phenyl)-1-(2, 5-dimethyl-thiophen-3-yl)-propenone (DDTP): A new potential laser dye

N-[(9-Ethyl-9H-carbazol-3-yl)methylene]-3,4-dimethylisoxazol-5-amine

The title compound, N-[(9-ethyl-9H-carbazol-3-yl)methylene]-3,4-dimethylisoxazol-5-amine has been synthesized by reaction of 9-ethyl-9H-carbazole-3-carbaldehyde with 5-amino-3,4-dimethylisoxazole in the presence of acetic acid in ethanol. The structure of this new compound was confirmed by elemental analysis, IR, 1H-NMR, 13C-NMR and EI-MS spectral analysis.

Selective extraction and detection of noble metal based on ionic liquid immobilized silica gel surface using ICP-OES

The synthesis and application of (<i>E</i>)-<i>N</i>′-(benzo[<i>d</i>]dioxol-5-ylmethylene)-4-methyl-benzenesulfonohydrazide for the detection of carcinogenic lead

In this study, noble ligands of (<i>E</i>)-<i>N</i>'-(benzo[<i>d</i>]dioxol-5-ylmethylene)-4-methyl-benzenesulfonohydrazide (BDMMBSH) were prepared <i>via</i> a simple condensation method using benzo-[<i>d</i>][1,3]-dioxole carbaldehyde, benzenesulfonylhydrazine (BSH), and 4-methyl-benzenesulphonylhydrazine (4-MBSH) in good yield, which were crystallized in acetone, EtOAc, and EtOH. The BDMMBSH derivatives were characterized using different spectroscopic techniques, such as ¹H-NMR, ¹³C-NMR, FTIR, and UV-Vis spectroscopy, and their crystal structures were analyzed using the single crystal X-ray diffraction method (SCXRDM). Subsequently, the BDMMBSH compounds were used for the significant detection of the carcinogenic heavy metal ion, lead (Pb²⁺), <i>via</i> a reliable electrochemical approach. A sensitive and selective Pb²⁺ sensor was developed <i>via</i> the deposition of a thin layer of BDMMBSH on a GCE with the conducting polymer matrix Nafion (NF). The sensitivity, LOQ, and LOD of the proposed sensor towards Pb²⁺ were calculated from the calibration curves to be 2220.0 pA μM^-1 cm^-2, 320.0 mM, and 96.0 pM, respectively. The validation of the BDMMBSH/GCE/NF sensor probe was performed <i>via</i> the selective determination of Pb²⁺ in spiked natural samples with a satisfactory and rational outcome.

Three-Dimensional Structures of MoS₂@Ni Core/Shell Nanosheets Array toward Synergetic Electrocatalytic Water Splitting

Hydrogen evolution reaction (HER) in alkaline media using non-noble metal catalysts with great efficiency represents a critical challenge in current water-alkaline and chlor-alkali electrolyzers. Herein, we demonstrate that the MoS2@Ni core/shell nanosheets array vertically aligned on carbon cloth (MoS2@Ni/CC) is a highly active electrocatalyst for HER. In alkaline solutions, MoS2@Ni/CC needs overpotentials of 91, 118, and 196 mV to approach current densities of 10, 20, and 100 mA cm(-2), respectively, exceeding behavior of commercial Pt/C catalyst at high current densities. Additionally, this catalyst also exhibits excellent electrocatalytic activity toward HER in neutral electrolytes. Such high hydrogen evolution activities are due to synergistic electrocatalytic effects between MoS2 core and Ni shell.

Sulfur-Doped Carbon Nitride Polymers for Photocatalytic Degradation of Organic Pollutant and Reduction of Cr(VI)

As a promising conjugated polymer, binary carbon nitride has attracted extensive attention as a metal-free and visible-light-responsive photocatalyst in the area of photon-involving purification of water and air. Herein, we report sulfur-doped polymeric carbon nitride microrods that are synthesized through thermal polymerization based on trithiocyanuric acid and melamine (TM) supramolecular aggregates. By tuning the polymerization temperature, a series of sulfur-doped carbon nitride microrods are prepared. The degradation of Rhodamine B (RhB) and the reduction of hexavalent chromium Cr(VI) are selected as probe reactions to evaluate the photocatalytic activities. Results show that increasing pyrolysis temperature leads to a large specific surface area, strong visible-light absorption, and accelerated electron-hole separation. Compared to bulk carbon nitride, the highly porous sulfur-doped carbon nitride microrods fabricated at 650 °C exhibit remarkably higher photocatalytic activity for degradation of RhB and reduction of Cr(VI). This work highlights the importance of self-assembly approach and temperature-control strategy in the synthesis of photoactive materials for environmental remediation.

CCDC 889915: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

CCDC 889888: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

(<i>E</i>)-4-(2,5-Dimethoxybenzylidene)-2-phenyl-1,3-oxazol-5(4<i>H</i>)-one

The central aza-lactone ring in the title compound, C(18)H(15)NO(4), is planar (r.m.s. deviation 0.05, 0.12 Å) in both independent mol-ecules comprising the asymmetric unit. The benzyl-idene substituent is coplanar with this ring [dihedral angle between the planes = 1.8 (1)° in the first mol-ecule and 2.8 (1)° in the second], as is the phenyl substitutent [dihedral angle between rings = 4.6 (1) and 9.7 (1)°, respectively].

Nanoparticles Addition in Coir‐Basalt‐Innegra Fibers Reinforced Bio-synthetic Epoxy Composites

A Ce²⁺ sensor based on napthalen-1-yl-methylene-benzenesulfonohydrazide (NMBSH) molecules: ecological sample analysis

A sensitive and selective Ce²⁺ sensor was developed based on napthalen-1-yl-methylene-benzenesulfonohydrazide (NMBSH) derivatives <italic>via</italic> an electrochemical approach.

Synthesis of Some Vanillin Derivatives and their Use as an Optical Sensor for the Detection of Volatile Organic Compounds

Abstract. Six new dyes derived from vanillin and active methylene have been prepared and characterized using H-NMR, FT-IR spectral data. These dyes were tested for use as sensors for volatile organic compounds (VOCs namely Triethyl amine and diethyl amine). The electronic spectra of these dyes was examined and gave color depending on the acceptor groups. The compounds were tested to sense organic amines such as diethyl amine and triethyl amine, all the compounds tested gave color change from less color to deep color which can be seen by naked eye, rendering these materials to be easy, inexpensive sensor for volatile organic compounds which are basic in nature.

In-situ phenylhydrazine chemical detection based on facile Zr-doped MoS2 nanocomposites (NCs) for environmental safety

Green chemistry methods: Synthesis of bioactive molecules-based quinazoline, quinoline, quinoxaline, benzimidazole and imidazole

The destruction of the ecosystem caused by chemicals such as pesticides, fertilizers, plastics, and greenhouse gases has provoked the conscience of the public and regulators to control the use of chemicals. There is a growing concern and awareness about preserving the environment against the danger of toxic substances. Sustainable industrial development as a means of cutting pollution from industry and developing renewable raw materials for industry has been a challenge in the twenty-first century. This review outlines the basics and ideas of green chemistry with examples and emphasis on the synthesis of bioactive molecules—based quinazoline, quinoline, quinoxaline, benzimidazole and imidazole from 2012 to 2025 to illustrate different fronts for developmental improvement in achieving sustainable procedures.

CCDC 1956019: Experimental Crystal Structure Determination