Preparation of Fe3O4-chitosan hybrid nano-particles used for humic acid adsorption

2016 ◽  
Vol 6 ◽  
pp. 64-75 ◽  
Author(s):  
Muhammad Ali Zulfikar ◽  
Sonita Afrita ◽  
Deana Wahyuningrum ◽  
Mia Ledyastuti
Keyword(s):  
Humic Acid ◽  
Nano Particles

scholarly journals Relative toxicity of two natural compounds compared to abamectin against some soybean pests under period rates

OCL ◽  
2021 ◽  
Vol 28 ◽  
pp. 32
Author(s):  
Hala Hussien Alakhdar ◽  
Zeinab Elsayed Ghareeb
Keyword(s):  
Humic Acid ◽  
Integrated Management ◽  
Natural Compounds ◽  
Nano Particles ◽  
Sustainable Pest Management ◽  
Relative Toxicity ◽  
Phenacoccus Solenopsis ◽  
Control Target ◽  
Experimental Treatments ◽  
Plot Design

A sustainable pest management in agro-ecosystems requires parallel assessments of pesticide and natural compounds to control target pests. In the present study, a semi-field experiment was conducted to evaluate the relative toxicity of abamectin (Abamax), humic acid, and Chitosan Nano-Particles (C.N.Ps) against four soybean pests: Tetranychus urticae, Eutetranychus orientalis, Bemisia tabaci, and Phenacoccus solenopsis. The experimental treatments were arranged in a split-plot design with three replicates, where treatments were assigned to main plots and pest populations under different periods in the subplots. The obtained results and graphs demonstrated that there were considerable differences between the total numbers of pests after different periods of treatment. Generally, E. orientalis recorded the minimum pest number at all. Different tested compounds demonstrated a considerable correlation between the densities of the pests. T. urticae exhibited a significant correlation with the other three pests (E. orientalis, B. tabaci, and P. solenopsis). E. orientalis did not correlate with B. tabaci and P. solenopsis. The humic acid recorded the best effect on T. urticae after 3 days with a reduction of 85.45% and E. orientalis after 7 days 65.55%. However, Chitosan Nano-Particles (C.N.Ps) was the best for E. orientalis after 14 days (mortality 74.36%). In contrast, abamectin (Abamax) had a general mean of reduction of 91.17% against T. urticae, whenever, these compounds are promising for controlling T. urticae, E. orientalis, B. tabaci, and P. solenopsis. These results may be a supporting method to overcome some soybean pests. The findings are discussed within the context of integrated management of soybean pests under semi-field conditions.

scholarly journals Humic Acid Adsorption Onto Iron Oxide Magnetic Nano Particles in Aquious Solution

2013 ◽  
Vol 1 (1) ◽  
pp. 44-55
Author(s):  
Maryam Foroghi ◽  
Afshin Ebrahimi ◽  
Hamze Esmaili ◽  
Mahdi Saeidi ◽  
◽  
...  
Keyword(s):  
Iron Oxide ◽  
Humic Acid ◽  
Nano Particles ◽  
Magnetic Nano Particles

Removal of Cd, Pb and Cu from Water Using Thiol and Humic Acid Functionalized Fe2O3 Nanoparticles

2012 ◽  
Vol 518-523 ◽  
pp. 1956-1963 ◽  
Author(s):  
Meng Wang ◽  
Shi Bao Chen
Keyword(s):  
Humic Acid ◽  
Metal Ions ◽  
Langmuir Isotherm ◽  
Nano Particles ◽  
Contaminated Water ◽  
Adsorption Ability ◽  
Sorption Ability ◽  
Cu Ions ◽  
Potential Use

Humic acid (HA) and 3-Mercaptopropyltriethoxysilane (MPTES) were successfully coated onto the surface of Fe2O3 (α and γ) nano-particles as characterized using IR and BET-N2 analysis, the potential use of the naked and functionalized nano-Fe2O3 particles as novel nano-sorbents for removal of Cd, Pb and Cu ions in solution was investigated in this study. The result indicated that the sorption of Cd, Pb and Cu ions by the nano-particles can be fitted well using langmuir isotherm; all the adsorbents exhibited definitely adsorption ability to Cd, Pb and Cu ions in solution. The sorption maximum and sorption affinity on the nano-particles for Pb (aq) were always higher than Cu (aq) and Cd (aq), the sorption maxima for the Pb, Cd and Cu followed the order Pb>Cu>Cd. Among the nano-sorbents, the Fe2O3 (α and γ) nano-particles coated with HA exhibited higher sorption ability to metal ions than the naked and thiolated Fe2O3 nano-particles, the sorption maxima of α-Fe2O3/HA for Pb(aq) reached 151.5 mg/g, which was significantly higher than the values of 116.3 and 84.0 mg/g observed for the α-Fe2O3 and α- Fe2O3/MPTES particles. However, no increased sorption maxima was observed for the thiolated Fe2O3 nano-particles (Fe2O3/MPTES) for the metal ions compared with the naked Fe2O3 nano-particles in this study. The greater capability of Fe2O3/HA to adsorb Cd(aq), Pb(aq), Cu(aq) indicates its potential use as another promising way to remediate metals-contaminated water.

Electron holography of catalysts

1995 ◽  
Vol 53 ◽  
pp. 416-417
Author(s):  
A. K. Datye ◽  
D. S. Kalakkad ◽  
L. F. Allard ◽  
E. Völkl
Keyword(s):  
Heterogeneous Catalysts ◽  
High Surface ◽  
High Surface Area ◽  
Atomic Scale ◽  
Nano Particles ◽  
Phase Image ◽  
Electron Holography ◽  
Specimen Thickness ◽  
Phase Information ◽  
Particle Structure

The active phase in heterogeneous catalysts consists of nanometer-sized metal or oxide particles dispersed within the tortuous pore structure of a high surface area matrix. Such catalysts are extensively used for controlling emissions from automobile exhausts or in industrial processes such as the refining of crude oil to produce gasoline. The morphology of these nano-particles is of great interest to catalytic chemists since it affects the activity and selectivity for a class of reactions known as structure-sensitive reactions. In this paper, we describe some of the challenges in the study of heterogeneous catalysts, and provide examples of how electron holography can help in extracting details of particle structure and morphology on an atomic scale.Conventional high-resolution TEM imaging methods permit the image intensity to be recorded, but the phase information in the complex image wave is lost. However, it is the phase information which is sensitive at the atomic scale to changes in specimen thickness and composition, and thus analysis of the phase image can yield important information on morphological details at the nanometer level.

Coherent electron nanodiffraction from clean silver nano particles in a UHV STEM

1993 ◽  
Vol 51 ◽  
pp. 1058-1059
Author(s):  
J. Liu ◽  
M. Pan ◽  
G. E. Spinnler
Keyword(s):  
Supported Catalysts ◽  
Imaging Techniques ◽  
Nano Particles ◽  
Metal Particles ◽  
Shape Structure ◽  
Dynamical Simulations ◽  
Small Metal Particles ◽  
Extract Information

Small metal particles have peculiar chemical and physical properties as compared to bulk materials. They are especially important in catalysis since metal particles are common constituents of supported catalysts. The structural characterization of small particles is of primary importance for the understanding of structure-catalytic activity relationships. The shape and size of metal particles larger than approximately 5 nm in diameter can be determined by several imaging techniques. It is difficult, however, to deduce the shape of smaller metal particles. Coherent electron nanodiffraction (CEND) patterns from nano particles contain information about the particle size, shape, structure and defects etc. As part of an on-going program of STEM characterization of supported catalysts we report some preliminary results of CEND study of Ag nano particles, deposited in situ in a UHV STEM instrument, and compare the experimental results with full dynamical simulations in order to extract information about the shape of Ag nano particles.

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