scholarly journals Fabrication of Conifer Gum Based Metal Nano Particles for Pollution Control Applications

2021 ◽  
Author(s):  
RATHIKA GOVINDASAMY ◽  
SUBA VELU ◽  
SANTHANA LAKSHMI DURAIKKANNU ◽  
ROOPALA RANI SEKAR
Keyword(s):  
Copper Oxide ◽  
Cobalt Oxide ◽  
Nano Particles ◽  
Synthetic Dyes ◽  
Order Kinetic ◽  
Cobalt Oxide Nanoparticles ◽  
Degradation Of Dyes ◽  
High Resolution Tem ◽  
Order Kinetic Model ◽  
Antibacterial And Antifungal

Abstract In recent decades, the analysis of nanoparticles is of greater importance for their applications in various fields. This present work also focuses the novel biological green material to synthesize the copper and cobalt oxide nanoparticles. The copper oxide (CuO) and cobalt oxide (Co3O4) nanoparticles (nps)have been synthesized by biological strategy utilizing AH (Araucaria heterophylla) gum extract. The characterization techniques, i.e. UV, GC-MS, FT-IR, XRD, SEM, HR-TEM provide concrete information about the morphology, crystalline nature and structure of the synthesized nanoparticles. The high resolution TEM and SAED images confirm the formation of spherical shaped (Co3O4) and oval shaped (CuO) isolated nanoparticles. The catalytic adequacy of the developed catalyst, copper oxide (CuO) and cobalt oxide (Co3O4) nanoparticles was analyzed for the degradation of dyes: Methylene Blue (MB), Congo Red (CR), Acid Violet (AV).The kinetic investigations for the reduction of synthetic dyes by the nanoparticles were assessed and the reduction contemplates are very much fitted with the pseudo second order kinetic model with less time.The antibacterial and antifungal activity of the prepared nanoparticles have been evaluated against Escherichiacoli, Staphylococcus aureus, Bacillus subtilis, Aspergillusniger and Candida albicans.

scholarly journals Photocatalytic Degradation of Organic Dyes by H4SiW6Mo6O40/SiO2Sensitized by H2O2

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Li Yu ◽  
Yongkui Huang ◽  
Yun Yang ◽  
Yulin Xu ◽  
Guohong Wang ◽  
...  
Keyword(s):  
Degradation Rate ◽  
Organic Dyes ◽  
Irradiation Time ◽  
Order Kinetic ◽  
Optimal Conditions ◽  
Basic Fuchsin ◽  
First Order ◽  
Degradation Of Dyes ◽  
Order Kinetic Model ◽  
Catalyst Dosage

H4SiW6Mo6O40/SiO2was sensitized by H2O2solution that significantly improved its catalytic activity under simulated natural light. Degradation of basic fuchsin was used as a probe reaction to explore the influencing factors on the photodegradation reaction. The results showed that the optimal conditions were as follows: initial concentration of basic fuchsin 8 mg/L, pH 2.5, catalyst dosage 4 g/L, and light irradiation time 4 h. Under these conditions, the degradation rate of basic fuchsin is 98%. The reaction of photocatalysis for basic fuchsin can be expressed as the first-order kinetic model. After being used continuously for four times, the catalyst kept the inherent photocatalytic activity for degradation of dyes. The photodegradation of malachite green, methyl orange, methylene blue, and rhodamine B were also tested, and the degradation rate of dyes can reach 90%–98%.

Characterization of Durian Seed Starch/PVOH Composite Hydrogel as a Potential Adsorbent for Removal of Hazardous Dyes

2014 ◽  
Vol 931-932 ◽  
pp. 286-290 ◽  
Author(s):  
W. Pimpa ◽  
C. Pimpa
Keyword(s):  
Adsorption Capacity ◽  
Synthetic Dyes ◽  
Order Kinetic ◽  
Solution Ph ◽  
Environment Friendly ◽  
Composite Hydrogels ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Durian Seed

The intention of this study was to prepare the environment friendly durian seed starch/polyvinyl alcohol (DSS/PVOH) composite hydrogels modified by chemical cross-linking with glutaraldehyde and to assess the adsorption potential of the DSS/PVOH composite hydrogels for the removal of the synthetic dyes from aqueous solution. The hydrogels were characterized by swelling behavior and scanning electron microscope (SEM). The effect of DSS content and initial dye solution pH on the adsorption capacity was studied conducting batch experiment system. The DSS/PVOH composite hydrogels consisting 3% DSS has optimum adsorption capacity of 3.411 mg/g (for methylene blue under the condition of pH 7) and 3.274 mg/g (for acid orange 8 under the condition of pH 2.5) at 24 h of contact time. The adsorptions were well fitted by the pseudo-second order kinetic model. It was indicated that the mechanism of removal predominant is effective for low dye concentrations, below 10 mg/l.

scholarly journals Green synthesis of Copper oxide and Cobalt oxide nanoparticles using Spinacia Oleracea leaf extract

2020 ◽  
Author(s):  
Yameen Ahmed ◽  
Jamshaid Hussain ◽  
Sohaib Asif
Keyword(s):  
Copper Oxide ◽  
Cobalt Oxide ◽  
Leaf Extract ◽  
Spinacia Oleracea ◽  
Average Crystallite Size ◽  
Morphological Properties ◽  
Oxide Nanoparticles ◽  
Salt Solutions ◽  
Cobalt Oxide Nanoparticles ◽  
Chloride Hexahydrate

The investigation aims at the synthesis of copper oxide and cobalt oxide nanoparticles using Spinacia Oleracea leaf extract. The Spinacia Oleracea leaf extract behaves as a reducing agent in the nanoparticle synthesis. Plant extract was first prepared and then treated with copper and cobalt salt solutions to get the precipitate. The salt solutions used for this purpose are copper sulphate pentahydrate (CuSO4.5H2O) and cobalt chloride hexahydrate (CoCl2.6H2O). The UV-Vis, XRD, EDX and SEM techniques are used to find optical, structural and morphological properties of copper oxide and cobalt oxide nanoparticles. The average crystallite size of copper oxide nanoparticles is 44 nm and have a hexapod structure. The UV absorption peaks are at 326 nm and 506 nm for copper oxide and cobalt oxide nanoparticles.

scholarly journals Enhanced photocatalytic degradation of doxycycline using a magnetic polymer-ZnO composite

2018 ◽  
Vol 2017 (3) ◽  
pp. 791-801 ◽  
Author(s):  
Ali Mohammadi ◽  
Shabnam Pourmoslemi
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Degradation ◽  
Extraction Efficiency ◽  
Nano Particles ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Order ◽  
Polymer Precipitation ◽  
Order Kinetic Model

Abstract A novel magnetic polymer-ZnO composite was prepared by incorporating Fe3O4 and ZnO nano-particles in the structure of an adsorbent polymer. Precipitation polymerization was used for synthesizing the adsorbent polymer and its efficiency for extracting doxycycline from aqueous solution was optimized according to several parameters including time, pH and amount of polymer. Results showed the highest extraction efficiency at neutral pH of the doxycycline solution in 20 min, and the capacity of the polymer was about 20 mg/g. The magnetic property of a material is important for fast and facile separation of composite particles after each use. Magnetic polymer-ZnO composite was synthesized by adding Fe3O4 and ZnO nano-particles to the polymerization mixture in order to take advantage of both sorption and photocatalytic degradation mechanisms. The obtained composite was characterized using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy equipped with wavelength dispersive X-ray spectroscopy and used for enhanced photocatalytic degradation of doxycycline in aqueous solution. Results showed 76.5% degradation of doxycycline in 6 hours which was significantly higher than the degradation observed by an equivalent amount of ZnO nano-particles. Photocatalytic degradation of doxycycline fitted the pseudo first order kinetic model with a rate constant of 4 × 10−3 μg mL−1 min−1.

scholarly journals Role of edta capped cobalt oxide nanomaterial in photocatalytic degradation of dyes

2020 ◽  
pp. 74-74
Author(s):  
Meena Singh ◽  
Dipti Vaya ◽  
Ravi Kumar ◽  
Bijoy Das
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Degradation ◽  
Cobalt Oxide ◽  
Ultra Violet ◽  
Environmental Damage ◽  
Light Illumination ◽  
Order Kinetic ◽  
Effective Electron ◽  
Pure Cobalt ◽  
Degradation Of Dyes

Dyes released from textile, paint, and various other industries in wastewater have posed long term environmental damage. Functional nano-materials provide a hope and opportunities to treat these effluent wastes in a rapid and efficient way due to their large surface area to volume ratios. Synthesis of 2,2',2'',2'''-(Ethane-1,2-diyldinitrilo)tetraacetic acid (EDTA) cap-ped cobalt oxide nanomaterial as a photocatalyst has been investigated and utilized for the rapid and efficient removal of malachite green (MG) and crystal violet (CV) dyes. The morphological, structural, optical, chemical and thermal properties of the synthesized nanomaterial were investigated using different characterization tools such as Scanning electron microscopy(SEM), Transmis-sion electron microscopy (TEM), X-ray diffraction (XRD), Ultra violet visible (UV-Vis), Fourier transform infrared (FT-IR) spectroscopy and Thermogra-vimetric analysis (TGA) etc. The prepared EDTA capped Cobalt oxide nanomaterials display better photocatalytic degradation, 56.3 % for MG and 37.9 % for CV in comparison to the pure Cobalt oxide, 47.7 and 27.6 %, respectively under visible light illumination. The kinetics study followed the pseudo-first order kinetic model and Freundlich adsorption isotherm model. The incremental photodegradation of these two dyes was attributed by mor-phology of the nanomaterial which favour effective electron/hole separation.

Heterogeneous Photocatalytic Degradation of Chlorophenols over Ag-TiO2 Nano Particles in an Aqueous Suspension

2007 ◽  
Vol 124-126 ◽  
pp. 1745-1748
Author(s):  
Selvaraj Rengaraj ◽  
Jei Won Yeon ◽  
Xiang Zhong Li ◽  
Yongju Jung ◽  
Won Ho Kim
Keyword(s):  
Photocatalytic Oxidation ◽  
Aqueous Suspension ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Nano Particles ◽  
Order Kinetic ◽  
Visible Absorption ◽  
Lorentz Oscillator ◽  
Ultrasonic Assisted ◽  
Order Kinetic Model

In the present work, TiO2 and Ag-TiO2 catalysts were prepared by an ultrasonic assisted sol-gel method. The physico-chemical characteristics studies of the newly synthesized catalysts were carried out by XRD, TEM, EDX, XPS, UV-Visible absorption spectra and an optical ellipsometry. In order to find out the optical absorption properties of the catalysts, theoretical simulations have been carried out by using the Tauc-Lorentz oscillator model. Photodegradation and mineralisation of the chlorophenols were confirmed by the HPLC and TOC measurements. The rate of a mineralisation trend was observed in the order of P < 2-CP < 2,4-DCP < 2,6-DCP < 4-CP < 2,4,6-TCP by using the Ag-TiO2 catalyst. The concentration of the main aromatic intermediate products was considerably lower for the Ag-TiO2 photocatalysts than for pure TiO2. This experiment demonstrated that the presence of Ag on TiO2 catalysts could enhance the photocatalytic oxidation of chlorophenols in an aqueous suspension. It was found that the degradation of the chlorphenols by these catalysts followed the pseudo- first order kinetic model.

scholarly journals Tandem structured spectrally selective coating layer of copper oxide nanowires combined with cobalt oxide nanoparticles

Nano Energy ◽  
2015 ◽  
Vol 11 ◽  
pp. 247-259 ◽  
Author(s):  
Tae Kyoung Kim ◽  
Bryan VanSaders ◽  
Jaeyun Moon ◽  
Taewoo Kim ◽  
Chin-Hung Liu ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Cobalt Oxide ◽  
Coating Layer ◽  
Oxide Nanoparticles ◽  
Oxide Nanowires ◽  
Cobalt Oxide Nanoparticles ◽  
Selective Coating ◽  
Spectrally Selective

Chitosan-based Magnetic Composites - Efficient Adsorbents for Removal of Pb(II) and Cu(II) from Aqueous Mono and Bicomponent Solutions

2018 ◽  
Vol 69 (9) ◽  
pp. 2323-2330 ◽  
Author(s):  
Daniela C. Culita ◽  
Claudia Maria Simonescu ◽  
Rodica Elena Patescu ◽  
Nicolae Stanica
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Chemical Properties ◽  
Order Kinetic ◽  
Mass Ratio ◽  
Magnetic Adsorbent ◽  
Magnetic Composites ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Physical And Chemical

A series of three chitosan-based magnetic composites was prepared through a simple coprecipitation method. It was investigated the influence of mass ratio between chitosan and magnetite on the physical and chemical properties of the composites in order to establish the optimum conditions for obtaining a composite with good adsorption capacity for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions. It was found that the microspheres prepared using mass ratio chitosan / magnetite 1.25/1, having a saturation magnetization of 15 emu g--1, are the best to be used as adsorbent for the metal ions. The influence of different parameters such as initial pH values, contact time, initial concentration of metal ions, on the adsorption of Pb(II) and Cu(II) onto the chitosan-based magnetic adsorbent was investigated in details. The adsorption process fits the pseudo-second-order kinetic model in both mono and bicomponent systems, and the maximum adsorption capacities calculated on the basis of the Langmuir model were 79.4 mg g--1 for Pb(II) and 48.5 mg g--1 for Cu(II) in monocomponent systems, while in bicomponent systems were 88.3 and 49.5 mg g--1, respectively. The results revealed that the as prepared chitosan-based magnetic adsorbent can be an effective and promising adsorbent for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions.

Sign in / Sign up

Export Citation Format

Share Document