Water-Soluble Graft Copolymer Synthesized from Collagenous Waste and Polyethylene Glycol (PEG) with Functional Carboxylic Chains: A Highly Efficient Adsorbent for Chromium(III) with Continuous Recycling and Molecular Docking Studies

A pragmatic pathway to zero emission is achieved by utilizing solid and liquid wastes completely by recycling and generating value-added auxiliaries from chrome shaving waste through process-intensified unit operations. Graft copolymer was synthesized from chrome shaving waste and poly­ethylene glycol (PEG), which is used as an adsorbent in the fresh chrome tanning process. The copolymer was characterized via thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), Fourier transform infrared (FT-IR) spectroscopy, and particle size analyses. FT-IR results have been characterized, confirming that the presence of free functional carboxylic acid is involved in chromium adsorption. The application of 6% copolymer in chrome tanning showed 95.95% optimal adsorption of chromium in the first cycle and 98.90% optimal adsorption of chromium in the second cycle. ¹H NMR investigation revealed a peak at 8.384 ppm (6% copolymer) in the experimental sample, confirming that the participation of free functional carboxylic acid groups plays a primary role in adsorbing chromium. Molecular modeling showed an increased adsorption of chromium and greater participation of ligand–copolymer with collagen, resulting in a docking energy of 3.9 kcal/mol through hydrogen bonding, establishing the spatial arrangement of the active functional groups. A mathematical model for the prediction of concentration of chromium adsorbed by the copolymer has been proposed. Scanning electron microscopy (SEM) and scanning electron microscopy coupled with energy-dispersive X-ray (SEM-EDX) studies confirmed an increase in the adsorption of Cr especially: 6.33 wt % of Cr (2.03 at. %) in samples containing 6% copolymer. Atomic force microscopy (AFM) studies from topography and deflection showed clear pictures of increased adsorption of chromium by the copolymer, indicated by the absence of chromium spots on the surface for the experimental samples

Functionalized electrospun nanofibers for high efficiency removal of particulate matter

In recent years, introducing electrospun airfilters to enhance the removal of PM2.5 and PM10-2.5 has received much interest. In this study, a novel poly-(vinyl) alcohol (PVA)/carbon nanopArticle (CNP)/tea leaf extract (TLE), functionalized nanofibrous air filter (FNA) was fabricated using an electrospinning method. Novelty of the unique work in the blending of CNP and TLE, first of its kind, for the preparation of FNA. Polysaccharide crosslinked FNA has a carbon complex with two monosaccharide units to produce the intrinsic properties of the PM2.5 and PM10-2.5 removal efficiency. The FNA had promising traits of UV protection. The prepared FNA was characterized using physicochemical, mechanical, antimicrobial activity, etc., in addition to its PM2.5 and PM10-2.5 removal efficiency. Pore size and distribution study using the capillary flow porometry method has proved the structure of FNA. FNA exhibited excellent low pressure drop (110 Pa), which are promising characteristics for air purification. FNA from PVA: CNP: TLE exhibited high PM2.5 and PM10-2.5 removal efficiencies of 99.25% and 99.29%, respectively. Hence, the study proved.2232-International Fellowship for Outstanding Researcher Program of TUBITAK (Project No: 118C350).TUBITAK [118C350

Electrospun nano-bio membrane for bone tissue engineering application-a new approach

WOS: 000540352000036The aim of this research study, develop electrospun nano-bio membrane (ENBM) from Poly (vinyl) alcohol (PVA), nano-Demineralized Bone Matrix (nano-DBM) and to impart additional strength, incorporation of carbon nanoparticles (CNP) by elctrospinning machine for their potential application in bone tissue regeneration. the effective of ENBM for biocompatibility properties were evaluated using MG 63 osteoblast cell line, which showed 100% biocompatibility and more viable cell present in the electrospun nano-biomembrane. in vitro biomineralization, more apatite formation was observed SEM images. Electrospun nanoscaffold prepared using PVA, nano-DBM and CNP (0.6%) possessed improved mechanical properties viz. 14.58 +/- 0.13 Mpa of tensile strength, 13.87 +/- 0.05% of elongation at break and 36.84 +/- 0.11% water absorption. This research study proved the bone formation of these ENBM in bone tissue regeneration and regenerative medicine.2232-International Fellowship for Outstanding Researcher Program of TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [118C350]Dr. Senthil Rethinam (Project Coordinator) acknowledges the funding support granted by the 2232-International Fellowship for Outstanding Researcher Program of TUBITAK (Project No: 118C350)

Graphene oxide reinforced nanocellulose/leather waste-based biopolymer nano compounds for possible bioenergy production

In this study, a blend of graphene oxide (GO), leather waste (leather sludge(LS)/leather fleshings (LF)), nano-cellulose (nano-C) (biopolymer), and glycerol (Gly) homogeneously in alkaline aqueous solution is used to produce biopolymer blended solution (BBS), by chemical polymerization, for use in bioenergy. The efficient and eco-friendly BBS was characterized by its physicochemical and electrical conductivity properties. The BBS achieved the highest current density energy value (0. 53 mA cm-2) at 1. 2 V. The results of the research show the significance of evaluating bioenergy technological environmental performance from comparable perspectives to examine and identify environmental exchange from existing bioenergy developments.TUBITAK 2232 -International Fellowship for Outstanding Researcher [118C350]The award of TUBITAK 2232 -International Fellowship for Outstanding Researcher (Project No: 118C350) to Dr. Rethinam Senthil is gratefully acknowledged

Differential Metal Ion Sensing by an Antipyrine Derivative in Aqueous and \u3b2-Cyclodextrin Media: Selectivity Tuning by \u3b2-Cyclodextrin

β-Cyclodextrin (β-CD) is a nontoxic cyclic oligosachcharide that can encapsulate all or part of organic molecules of appropriate size and specific shape through noncovalent interaction. Herein, we report the influence of β-CD complex formation of an antipyrine derivative on its metal ion sensing behavior. In aqueous solution, the antipyrine shows a turn-on fluorescence sensing of vanadyl ion, and in cyclodextrin medium it senses aluminum ion. The compound shows an unusual fluorescence quenching on binding with β-cyclodextrin (log KSV = 2.34 ± 0.02). The differential metal ion sensing is due to the partial blocking of the chelating moiety by the cyclodextrin molecule. The structure of the antipyrine–cyclodextrin complex is optimized by two-dimensional rotating-frame Overhauser effect spectroscopy. The binding constant is determined by isothermal titration calorimetry (log K = 2.09 ± 0.004). The metal ion binding site is optimized by quanutm mechanical calculations. The lower limit of detection of vanadyl and aluminum ions, respectively, are 5 × 10–8 and 5 × 10–7 mol dm–3. This is the first report of selectivity of two different cations by a chemosensor in water and in β-CD