Journal of modern science 

About: Journal of modern science is an academic journal published by Alcide De Gasperi University of Euroregional Economy in Józefów. The journal publishes majorly in the area(s): Business & Psychology. It has an ISSN identifier of 1734-2031. It is also open access. Over the lifetime, 724 publications have been published receiving 3677 citations. The journal is also known as: JoMS & Zeszyty Naukowo-Dydaktyczne.

Critical of linear and nonlinear equations of pseudo-first order and pseudo-second order kinetic models

Abstract: The experimental adsorption equilibrium of Cd(II) onto chitosan (Cd(II)/CS) and methyl orange onto bentonite (MO/Bt) were studied in batch adsorption experiments at room temperature for an initial concentration of 236.5 mg/L for Cd (II) (pH = 5) and 33 mg/L for MO (pH = 3). The adsorption rate increases rapidly for t

Plant-mediated synthesis of silver nanoparticles using fruit extract of Cleome viscosa L.: Assessment of their antibacterial and anticancer activity

Abstract: Green synthesis of silver nanoparticles was successfully done using Cleome viscosa plant extract, simple, rapid, eco-friendly and a cheaper method. In this study, we used C. viscosa extract for synthesizing silver nanoparticles which reduces silver nitrate into silver ions. The obtained AgNPs were characterized by UV, FTIR, XRD, FESEM-EDAX and TEM analysis. They were also analyzed for their biological activities. The presence of biosynthesized AgNPs (410–430 nm) was confirmed by UV–visible spectroscopy and also crystal nature of AgNPs confirmed through XRD analysis; FT-IR spectrum was used to confirm the presence of different functional groups in the biomolecules which act as a capping agent for the nanoparticles. The morphology of AgNPs was analyzed using SEM and the presence of silver was confirmed through elemental analysis. The size of the nanoparticles was in the range of 20–50 nm determined by TEM. The green synthesized AgNPs exhibited a good antibacterial activity against both Gram negative and Gram positive bacteria. Furthermore, the green synthesized AgNPs showed reliable anticancer activity on the lung (A549) and ovarian (PA1) cancer cell lines.

Optimisation using central composite design (CCD) and the desirability function for sorption of methylene blue from aqueous solution onto Lemna major

Abstract: Water pollution due to contamination of dye containing effluents is a great threat to water body. A study on the biosorption of methylene blue (MB) onto low-cost Lemna major biomass was conducted and the process parameters were optimized by response surface methodology (RSM). A two-level, four-factor central composite design (CCD) has been employed to determine the effect of various process parameters namely initial concentration (600–1000 mg L−1), bioadsorbent dose (0.20–1.50 g/100 mL), pH (5–12) and stirring rate (250–800 rpm) on MB uptake from aqueous solution. By using this design a total of 30 biosorption experimental data were fitted. The regression analysis showed good fit of the experimental data to the second-order polynomial model with coefficient of determination (R2) value of 0.9978 and model F-value of 953.48. The optimum conditions of initial concentration (1000 mg L−1), adsorbent dose (0.2 g), pH (5) and stirring rate (251.51 rpm) were recorded from desirability function. The adsorption isotherm data were best described by both Freundlich and Langmuir models with a maximum adsorption capacity of 488 mg MB g−1 L. major biomass at 30 °C which is higher than that available with adsorbents used by past researchers. Finally the pseudo second order kinetic model described the MB biosorption process with a good fitting (R2 = 0.999). The adsorbent was characterised by scanning electron micrograph (SEM) and Fourier transform infrared spectroscopy (FTIR).

Biosynthesis of silver nanoparticles using Capparis spinosa L. leaf extract and their antibacterial activity

Abstract: Plant extracts have recently been used for nanoparticles green synthesis since they are rich in bioactive compounds. The potential of biomolecules present in plant extracts to reduce metal ions to NPs in a single–step green synthesis process is very important. In this study, we have reported the synthesis of silver nanoparticles by reducing the silver ions present in the solution of silver nitrate by the cell free aqueous extract of Capparis spinosa leaves. Silver nanoparticles (AgNPs) were successfully synthesized using C. spinosa extract and the nature of synthesized nanoparticles was analyzed by UV–Vis spectroscopy, transmission electron microscopy, X–ray diffraction and Fourier transform infrared spectroscopy. The antimicrobial effect of NPs produced C. spinosa was studied using different pathogenic bacteria such as Escherichia coli, Salmonella typhimurium, Staphylococcus aureus and Bacillus cereus. From the disc diffusion results, the synthesized silver nanoparticles showed an excellent antibacterial property and a high antimicrobial activity compared to the ionic silver.

Plant-mediated biosynthesis and characterization of silver nanoparticles by leaf extracts of Tragia involucrata, Cymbopogon citronella, Solanum verbascifolium and Tylophora ovata

Abstract: Evolution of an ecological and biogenic experimental process for synthesis of nanoparticles is evolving into a significant offshoot of nanotechnology. As an important metal, silver nanoparticles (AgNPs) have a number of applications in medical domain. Since these silver nanoparticles have been used for infection prevention in the medical study, it may be more relevant to reduce their size by using ancient Indian herbal plants. A green rapid biogenic synthesis of silver nanoparticles using Tragia involucrata, Cymbopogon citronella, Solanum verbascifolium and Tylophora ovata aqueous extracts was demonstrated in this present study. The pathway of nanoparticles formation is by means of reduction of AgNO3 by leaf extracts, which acts as both reducing and capping agents. The formation of the silver nanoparticles was observed within 15 min. The properties of prepared nanoparticles were characterized by visual examination (color change), UV absorption, Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM) and X-ray Diffraction (XRD). An intense surface plasmon resonance band at ∼454 nm, ∼452 nm, ∼458 nm and ∼447 nm in the UV–visible spectrum clearly reveals the formation of silver nanoparticles. FTIR spectrum confirms the existence of various functional groups of biomolecules capping the nanoparticles. XRD studies reveal a high degree of crystallinity and monophasic Ag nanoparticles of face-centered cubic structure. The morphology of the particles formed consists of varied shapes such as rod, flower-like, spherical and hexagonal pattern. The biosynthesis of nanoparticles has received increasing attention due to the growing demand to produce secure, cost-effective and environmentally friendly technologies for nanomaterials synthesis.