NOPR Collection:

Kinetics and in vitro release studies of drug loaded silver nanoparticles from Indigofera tinctoria extract

2022-09-01T00:00:00Z

Title: Kinetics and in vitro release studies of drug loaded silver nanoparticles from Indigofera tinctoria extract Authors: Khambhaty, Yasmin; Bondada, Suryakiran; Mandal, Sujata Abstract: Silver nanoparticles (AgNP’s) have been successfully fabricated via bio-reduction of Indigofera tinctoria plant extract as the reducing and capping agent. The effects of pH and temperature on the formation of the AgNP’s have been studied. The synthesized AgNP’s have been characterized using UV-Visible spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy, Zeta potential analysis, Scanning Electron Microscope (SEM) and Atomic Force Microscopy (AFM). Antimicrobial activities of the synthesized AgNP’s have been tested against both bacterial and fungal strains by agar well diffusion method. The biomass-capped AgNP’s imparted antimicrobial activity by inhibiting the growth of Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus cereus, Aspergillus niger and Penicillium chrysogenum. The antioxidant activities of the synthesized AgNP’s exhibit low IC50 value of ~55.72 μg/mL. Studies on drug loading and kinetics of drug release reveal that I. tinctoria AgNP’s follow the zero-order kinetics at pH 4.6 and pH 7.4. The gradient value of 0.568 (pH 4.6) and 0.6 (pH 7.4) falls between 0.42 < n < 0.85 when fitted into Peppa’s plot indicating that the drug release follow an anomalous transport or non-Fickian diffusion transport, indicating that the diffusion is time dependent. Page(s): 473-484

Influence of non-metal dopants (O, S, N) and dimension of carbon nano materials on the fluorescence and photocatalytic degradation of organic pollutants

2022-09-01T00:00:00Z

Title: Influence of non-metal dopants (O, S, N) and dimension of carbon nano materials on the fluorescence and photocatalytic degradation of organic pollutants Authors: R, Usha; R, Fairlin Jenitha; S, Sudhaparimala Abstract: The usage of sanitizers and disinfectants results in the dumping of toxic organic residues in water. There is a global need for effective agents which can adsorb and degrade hazardous chemicals effectively and convert into much safer constituents. In this study, the influence of non-metal dopants (O, S, N) and dimensionality on the catalytic ability of carbon nanomaterials (CNs) such as 0-D (Nitrogen-doped Carbon quantum dots (N-CQDs) synthesized from the seed kernel of Caesalpinia bonducella) and 2-D (Graphene oxide (GO), Sulphur doped graphene oxide (S-GO), Nitrogen-doped graphene oxide (N-GO) synthesized from glucose) have been compared and correlated. The microstructure, surface morphology, elemental composition, fluorescence emission and catalytic ability of the 0-D and 2-D materials are determined and compared. The defect density and the sub defect band gap states influenced by different electronegative non-metal dopants and the dimensions are discussed. The Micro strain increases with increases in dimension. The percentage of Nitrogen as dopant in N-GO is relatively less compared with N-CQDs which led to less fluorescence intensity observed in N-GO. On comparison of the results, it is evident that greater electro negativity of the dopants and reduction in dimension will increase the photo catalytic activity. Also, in comparison with 2-D structures, the large surface area and greater quantum confinement of 0-D structure enhance the degradation of organic pollutants. This observation is well correlated with PL emission intensities of the compared CNs. The results provide a better correlation between dimensionality and functionality of CNs and their impact on catalytic (adsorption and photo) applications in experimentally possible ways. Page(s): 485-494

Adsorption technology and mechanism of As(III) and As(V) in wastewater by iron modified rice husk biochar

2022-09-01T00:00:00Z

Title: Adsorption technology and mechanism of As(III) and As(V) in wastewater by iron modified rice husk biochar Authors: Zang, Shuyan; Shao, Jinghan; Sun, Congting; Wang, Juan; Zhou, Huafeng Page(s): 492-502

Study of corrosion, crystal structure and magnetic properties on OL52 and OL52.4 steels in different seawaters

2022-09-01T00:00:00Z

Title: Study of corrosion, crystal structure and magnetic properties on OL52 and OL52.4 steels in different seawaters Authors: Popescu, Ana Maria; Demidenko, Olga; Donath, Cristina; Yanushkevich, Kazimir; Neacsu, Elena Ionela; Zhivulka, Aliona; Constantin, Virgil Abstract: The corrosion of OL 52 and OL52.4 steels exposed to seawaters (Black, Aegean and Mediterranean Sea) has been investigated by weight loss method and the corresponding corrosion rates in the three sea waters are calculated. Before and after immersion in the corrosive medium micrographic images are obtained. XRD and ponderomotive methods have been used to determine the influence of the seawaters corrosion processes on the structure and magnetization of the studied steels. Obtained results show that both OL52 and OL52.4 steels have good corrosion resistance in the studied seawaters. Page(s): 503-510