Diatomite is mined in Phu Yen province, Vietnam and the Fe2O3-diatomite materials are synthesized by a simple process for photo-Fenton reaction of rhodamine B (RhB) degradation. The pure diatomite have large pore structures representing high adsorption ability efficient photocatalysis. Characterizations diatomite-Fe2O3 were determined X-ray diffraction (XRD), FT-IR analysis, field emission scanning electron microscopy (FE-SEM) images, dynamic light scattering (DLS), inductively coupled...

Oligochitosan (OC) is effective biostimulant on growth promotion and elicitation against disease infection for plants. However, the range of OC molecular weight that exhibits most activity not fully understood requires further investigation. In this study, OCs with different average (Mw) were prepared by gamma Co-60 irradiation degradation chitosan in solution effect enhancement fruit yield chili plant (Capsicum frutescens L.) foliar application particularly Mw 7.8, 5.0, 2.5 kDa was...

Abstract This paper presents a green synthesis method for growing carbon quantum dots (CQDs) from turmeric starch. The CQDs were then used as reducing agents and stabilizers to synthesize dual-shaped gold nanoparticles (AuNPs) with spherical triangular shapes. In addition the advantages of in catalysis, such large surface area, many functional groups, excellent electron transfer ability, obtained AuNPs/CQDs nanocomposite material benefits plasmonic properties AuNPs, which enhance light...

Radiation-induced synthesis of colloidal silver nanoparticles (Ag-NPs) using chitosan (CTS) as a stabiliser and free radical scavenger is feasible satisfiable to green method. The conversion dose (Ag+ into Ag0) was determined by UV-Vis spectroscopy Ag-NPs size characterised transmission electron microscopy. average diameter smaller than 10 nm with narrow distribution the have good stability for long time storage. effect several parameters, such pH, Ag+ CTS concentration molecular weight on...

Cuprous oxide (Cu 2 O) nanoparticles in zeolite A were synthesized by two steps: (i) ion-exchange of copper ions into the and (ii) reduction cages hydrazine hydrate base medium. The Cu O nanoparticles/zeolite product was characterized X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDX). particle size 40 nm. antibacterial activity as-synthesized against Escherichia coli also investigated. NPs/zeolite can be favorably produced on large scale...

Abstract Colloidal solutions of silver nanoparticles (AgNPs) were synthesized by gamma Co-60 irradiation using different stabilizers, namely polyvinyl pyrrolidone (PVP), alcohol (PVA), alginate, and sericin. The particle size measured from TEM images was 4.3, 6.1, 7.6, 10.2 nm for AgNPs/PVP, AgNPs/PVA, AgNPs/alginate, AgNPs/sericin, respectively. influence stabilizers on the antibacterial activity AgNPs investigated. Results showed that AgNPs/alginate exhibited highest against Escherichia...

This work presented the results of study on synthesis and characterization nanosilica from rice husk ash (RHA). Nanosilica was obtained by calcination HCl treated RHA at 700 oC for 2 h. X-ray diffraction (XRD) pattern showed only one peak 2q ~22o confirming amorphous structure nanosilica. The chemical composition assessed energy dispersive spectroscopy (EDX) that high purity. TEM image measured transmission electron microscopy (TEM) revealed in spherical morphology with average diameter...

Alginate with a weight-average molecular mass (Mw) of approx. 9.04 x 10(5) Da was irradiated at 10-200 kGy in 4% (w/v) aqueous solution. The degraded alginate product used to study its effectiveness as growth promoter for plants tissue culture. 75 an Mw 1.43 10(4) had the highest positive effect flower plants, namely limonium, lisianthus and chrysanthemum. Treatment concentrations 30-200 mg/l increased shoot multiplication rate from 17.5 40.5% compared control. In plantlet culture, 100...

Colloidal silver nanoparticles were prepared by γ-irradiating Ag+ in aqueous solution the presence of 2% polyvinyl pyrrolidone (PVP) as stabilising agent and ethyl alcohol free radical (OH•) scavenger. The saturated conversion dose into Ag was determined UV–Vis spectroscopy size characterised transmission electron microscopy. influence concentration (1–50 mM) on average diameter investigated. Results showed that from 8 to 48 kGy particles range 6–21 nm for 1 50 mM. effect PVP molecular...

Abstract The preparation of oligochitosan through the heterogeneous degradation chitosan/H 2 O combined with homogeneous reaction chitosan H under gamma radiation was studied. Oligochitosan weight-average molecular weight (M w ) less than 10 kDa could be efficiently prepared by Co 60 irradiation solution (4%) and hydrogen peroxide (0.5%) at doses ranging from 8 to 24 kGy. M , chemical structure, crystallinity were characterized GPC, FT-IR, XRD. solubility antioxidant activity different...

Oligochitosan with weight average molecular (Mw) of 5000 g/mol was prepared by gamma Co-60 radiation degradation 4% chitosan solution containing 0.5% H2O2 at 21 kGy.Nanosilica size 10 -30 nm synthesized calcination acid treated rice husk 700 o C for 2 h.The mixture 2% oligo-chitosan2% nanosilica dispersion in oligochitosan solution.Oligochitosan, and their were characterized gel permeation chromatography (GPC), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy...

Nanomaterials hold great promise of improved plant disease resistance, controlled release agro-chemicals, enhanced growth, etc. In this study, the effect nanosilica (10 – 30 nm) prepared from rice husk on growth promotion chili in green house was carried out. The experiment treatment by foliar spraying arranged a factorial design with 3 replications at various concentrations 0, 40, 60 and 100 ppm. Plant characteristics chlorophyll content were assessed. Results showed that fresh weight, dry...

Abstract Cu 2 O‐Cu nanoparticles (Cu NPs) stabilized by alginate have been developed for using as a plant fungicide. The antifungal effect of NPs against Neoscytalidium dimidiatum fungus causing brown spot disease in dragon fruit plants was investigated. Transmission electron microscopy (TEM) used to assess the morphology and size O‐CuNPs. average diameter spherical NPswas determined be 5.4 ± 0.4 nm. Furthermore, O‐CuNPs were also characterized Fourier transform infrared (FT‐IR) X‐ray...