Rapid gram-scale synthesis of Au/chitosan nanoparticles catalysts using solid mortar grinding

2021 ◽  
Vol 45 (1) ◽  
pp. 438-446
Author(s):  
K. Paul Reddy ◽  
R. S. Meerakrishna ◽  
P. Shanmugam ◽  
Biswarup Satpati ◽  
A. Murugadoss
Keyword(s):  
Functional Groups ◽  
Chitosan Nanoparticles ◽  
High Density ◽  
Gold Particles ◽  
Chitosan Powder

Owing to the abundant functional groups present in the chitosan polymer, high density catalytic tiny gold particles with greater dispersion can be anchored on the chitosan powder using simple mortar and pestle.

Sustainably closed loop recycling of hierarchically porous polymer microbeads for efficient removal of cationic dyes

2022 ◽  
Author(s):  
Jikang Li ◽  
Qin Yang ◽  
Sheng Chen ◽  
Kerry McPhedran ◽  
Yingchun Gu ◽  
...  
Keyword(s):  
Functional Groups ◽  
Closed Loop ◽  
Selective Adsorption ◽  
High Density ◽  
Porous Polymer ◽  
Cationic Dyes ◽  
Efficient Removal ◽  
Hierarchically Porous

Abstract: Herein, we designed and fabricated a hierarchically porous crosslinked polymeric microbead (PCP) with high density of functional groups for selective adsorption of cationic dyes from water. On account of...

scholarly journals Humic Acid Isolation from Batujai Dam Lombok Tengah-NTB and its Potential as Reductive–Biosorbent Au(III) in The Batch System

2020 ◽  
Vol 21 (1) ◽  
pp. 43
Author(s):  
Nurul Ismillayli ◽  
Dhony Hermanto
Keyword(s):  
Humic Acid ◽  
Ftir Spectroscopy ◽  
Functional Groups ◽  
Aromatic Ring ◽  
Adsorption Process ◽  
Aliphatic Hydrocarbon ◽  
Gold Particles ◽  
Batch System ◽  
Sem Analyses

The Study of Au(III) ions adsorption by humic acid in batch system has been done. Humic acid was isolated from Batujai Dam Lombok Tengah 0.1 M NaOH and continued with 0.1 M HCl/0.3 M HF washing to dissolve silica. Functional groups of isolated humic acid was investigated by FTIR Spectroscopy and the adsorption process was studied by XRD and SEM analyses. It has been found that humic acid contained carboxylic, phenols, alcoholic, ether, amines functional groups, aliphatic hydrocarbon and aromatic ring. XRD and SEM data showed that humic acid did not only adsorp Au(III) ions but also reduce them to gold particles. Therefore, humic acid has the potential as reductive-biosorbent for Au(III) in batch system. Keywords: humic acid, reductive-biosorbent, Au(III) ions.

scholarly journals Arthropod Diversity of Pomegranate Crop under High Density Planting in Tamil Nadu

2020 ◽  
Vol 107 ◽  
pp. 1-4
Author(s):  
Elango K ◽  
◽  
Sridharan S ◽  
Keyword(s):  
Functional Groups ◽  
Natural Enemies ◽  
Tamil Nadu ◽  
Punica Granatum ◽  
High Density ◽  
Arthropod Diversity ◽  
Punica Granatum L

Insects associated with pomegranate (Punica granatum L.), was observed from 2015 to 2016 in four major pomegranate growing districts of Tamil Nadu viz., Coimbatore, Erode, Tiruppur and Karurat monthly intervals. A total of 31 species under two genera and sixteen families of six orders was documented. In addition, seven natural enemies in association with pomegranate pests were also recorded. Among the different functional groups, phytophagous groups were dominated, followed by predators and parasitoids.

scholarly journals Stabilising Potential of Sawdust Lignin based Extracts in Compressed Lateritic Bricks

2018 ◽  
Vol 20 (1) ◽  
pp. 16 ◽  
Author(s):  
Fadele, O.A ◽  
Ata, O.J.
Keyword(s):  
Compressive Strength ◽  
Human Health ◽  
Functional Groups ◽  
Strength Properties ◽  
High Density ◽  
Lignocellulosic Materials ◽  
Binding Ability ◽  
Soil Particles ◽  
Beneficial Uses

Lignocellulosic materials are abundant in nature, rich in some functional groups, considered less harmful to human health and the environment.The resulting waste may be recycled for other beneficial uses. Lignin is known to be a natural binder in lignocellulosic materials and several studies have confirmed it has binding ability with soil particles. This paper studied its stabilising potential in compressed lateritic bricks, especially its effects on density and compressive strength properties of the bricks. Lignin additives extracted from sawdust were used to stabilise laterite, while the bricks were moulded with the UNIFE ram, a type of the CINVA ram. The laterite was stabilised at 4%, 8% and 12%, while cement stabilised samples and 0% (unstabilised laterite) samples prepared accordingly were used as controls. The results showed that the LBAs contributed to the strength gained by the bricks at 3, 7, 14 and 28 days air curing, while the bricks samples were categorised as high density.

Improvement of Carbon Nanotube Films on SiC formed by Surface Decomposition by Hydrogen Peroxide Purification

2009 ◽  
Vol 1204 ◽  
Author(s):  
Takahiro Maruyama ◽  
Fumiya Nakahama ◽  
Shigeya Naritsuka
Keyword(s):  
Electron Microscopy ◽  
Hydrogen Peroxide ◽  
Transmission Electron Microscopy ◽  
Carbon Nanotube ◽  
Functional Groups ◽  
High Density ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotube ◽  
Shoulder Peak ◽  
Surface Decomposition

AbstractWe studied the effects of annealing in H2O2 on the morphologies and structures of “as grown” high-density, well-aligned multi-walled carbon nanotube (MWNT) films formed by surface decomposition of SiC. After annealing in H2O2 solution at 100°C for 3 h, the G/D ratio increased from 1.44 to 2.33, the FWHM of the G band peak became narrower, and a D′ shoulder peak appeared. Transmission electron microscopy (TEM) revealed that the dispersion of MWNTs in dimethylformamide (DMF) solution was improved, suggesting that film impurities were reduced and that damage to the MWNTs was negligible. After annealing for 9 h, the G/D ratio decreased to 1.57, and exfoliation of some MWNTs was observed. In addition, several functional groups such as carboxylic (-COOH) and hydroxyl (-OH) were formed on the surface of the MWNTs. From these results, we conclude that annealing in H2O2 under proper conditions can effectively purify “as grown” MWNT films formed by surface decomposition of SiC.

scholarly journals Dispersion of chitosan nanoparticles stable over a wide pH range by adsorption of polyglycerol monostearate

2020 ◽  
Vol 10 ◽  
pp. 184798042091726 ◽  
Author(s):  
Hyo-Sun Kim ◽  
Song-Hee Lee ◽  
Chae-Jung Eun ◽  
Jeseung Yoo ◽  
Young-Soo Seo
Keyword(s):  
Drug Carrier ◽  
Chitosan Nanoparticles ◽  
Hydrodynamic Diameter ◽  
Real Image ◽  
Food Ingredients ◽  
Chitosan Nanoparticle ◽  
Wide Ph Range ◽  
Ph Range ◽  
Chitosan Chain ◽  
Chitosan Powder

We have developed stable chitosan colloids over a wide pH range without cross-linkers or gelling agents. The colloid was prepared using chitosan nanoparticle obtained from pulverization of bulk chitosan powder, followed by surface treatment using small amount of ascorbic acid (AA) and polyglycerol monostearate (PGMS) in water. Chitosan nanoparticles were well dispersed in a diluted AA solution due to the protonation of the chitosan chain on the surface. And then, the addition of PGMS led them to exhibit highly stable dispersion even in alkali conditions and 50 °C. The hydrodynamic diameter of the colloid was monitored using dynamic light scattering and the real image of the colloid was obtained using cryo-electron microscope measurement. This chitosan colloid will be useful for developing food ingredients or drug carrier templates that should be stable over a wide pH range.

Carbohydrates in diversity-oriented synthesis: challenges and opportunities

2016 ◽  
Vol 14 (3) ◽  
pp. 808-825 ◽  
Author(s):  
E. Lenci ◽  
G. Menchi ◽  
A. Trabocchi
Keyword(s):  
Functional Groups ◽  
Building Blocks ◽  
High Density ◽  
Diversity Oriented Synthesis ◽  
Challenges And Opportunities ◽  
Polar Functional Groups

Carbohydrates are attractive building blocks for diversity-oriented synthesis due to their stereochemical diversity and high density of polar functional groups.

Development of a γ-polyglutamic acid binder for cathodes with high mass fraction of sulfur

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102626-102633 ◽  
Author(s):  
Tingting Qiu ◽  
Hongyuan Shao ◽  
Weikun Wang ◽  
Hao Zhang ◽  
Anbang Wang ◽  
...  
Keyword(s):  
Functional Groups ◽  
Mass Fraction ◽  
High Density ◽  
High Mass ◽  
Polyglutamic Acid

PGA binder, with a high density of electron-rich functional groups on the molecule, could suppress diffusion of polysulfides.

scholarly journals Photocatalytic Degradation of High Density Polyethylene using CaO Nanocatalyst

2020 ◽  
Vol 32 (9) ◽  
pp. 2293-2297
Author(s):  
V.S. KUMAWAT ◽  
J.P. BHATT ◽  
D. SHARMA ◽  
S.C. AMETA ◽  
R. AMETA
Keyword(s):  
Functional Groups ◽  
High Density Polyethylene ◽  
Chain Scission ◽  
High Density ◽  
Degree Of Crystallinity ◽  
Infrared Spectrometry ◽  
Scanning Calorimetry ◽  
Fusion Enthalpy ◽  
Before And After ◽  
Scanning Electron

The photodegradation of high density polyethylene (HDPE) using CaO nanoparticles as a catalyst was carried out using 500 W lamp. After exposure, morphology as well as thermal properties of the HDPE was investigated by scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). SEM results showed that the HDPE is more prone to crack into small fragments, which indicated a rise in crystallinity with different amounts of catalyst i.e. CaO nanoparticles. The DSC results confirmed the remarkable influence of photodegradation on degree of crystallinity (XC%), fusion enthalpy (ΔH J g-1) and melting temperature (Tm) of HDPE. Infrared spectrometry (FTIR) demonstrated all functional groups of HDPE, present before and after photodegradation. Overall results showed that HDPE was photodegraded into small fragments successfully by using CaO nanopartilces, where different functional groups such as carbonyl, esters and vinyl were obtained during chain scission.

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