Synthesis and Characterization of Chitosan-PVA hydrogels for pesticide release

MRS Advances ◽  
2019 ◽  
Vol 4 (59-60) ◽  
pp. 3269-3279
Author(s):  
Rafael Nuñez-Reyes ◽  
José Luis García-Rivas ◽  
Beatriz Garcia-Gaitan ◽  
Beatriz Magdalena Millan-Olvera ◽  
Marithza Guadalupe Ramírez-Gerardo
Keyword(s):  
Polymer Matrix ◽  
Sodium Tripolyphosphate ◽  
Maximum Load ◽  
Synthesis And Characterization ◽  
Visible Spectroscopy ◽  
Hydrogel Beads ◽  
Long Time ◽  
Uv Visible ◽  
Bet Technique

ABSTRACTChitosan (Ch)-Polyvinyl (alcohol) (PVA) hydrogels cross-linked with sodium tripolyphosphate were synthetized to obtain a polymer matrix encapsulating an insecticide (active ingredient: imidacloprid). Imidacloprid release tests were performed separately with moist and lyophilized hydrogel beads with a diameter of 3.47 and 3.30 mm respectively. The concentration of the insecticide released in the medium was determined by UV-Visible spectroscopy, reaching equilibrium for wet hydrogels at 72h at a concentration of 330 mg L-1 and 281 mg L-1 in 48h for lyophilized hydrogels, comparing it with a maximum load of 330.18 mg L-1of imidacloprid contained in the hydrogels. The characterization of hydrogels was performed by Fourier transform infrarred spectroscopy (FTIR) to determine the functional groups. The morphology of the polymer matrix of the hydrogels was carried out in a scanning electron microscope (SEM). The size distribution and diameter of bead samples were observed through a stereomicroscope. The percentage of humidity of the hydrogels was determined obtaining 94.8% once the imidacloprid was released. the pore size of the samples was determined by the Brunauer-Emmet-Teller (BET) technique. The techniques used indicated that controlled release of imidacloprid could be more efficient with wet hydrogels in relation to the maximum load of imidacloprid contained, for protection of crops is necessary for a long time because of insecticide disponible in the soil.

Synthesis and Characterization of Gold Nanoparticles Synthesized in Gel and Paper by Electrolysis

2019 ◽  
Vol 824 ◽  
pp. 163-167
Author(s):  
Pema Dechen ◽  
Ekasith Somsook
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Gold Nanoparticles ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
Visible Spectroscopy ◽  
Gold Leaf ◽  
Uv Visible ◽  
Scanning Electron

In this report, synthesis and characterization of gold nanoparticles (AuNPs) from gold leaf by electrolysis in two different media (gel and paper) in presence of sodium chloride (NaCl), glucose (C6H12O6) and polyvinyl pyrrolidone (PVP) at room temperature were investigated. Graphite was used as two electrodes, NaCl was used as an electrolyte, C6H12O6 was used as reducing agent and PVP was used as stabilizer to control the aggregation of the nanoparticles. UV-Visible spectroscopy (UV-Vis) and scanning electron microscopy (SEM) were used to confirm the characteristics and morphologies of the synthesized AuNPs.

scholarly journals Synthesis and characterization of Fe(III) complex with thiosemicarbazide-based ligand

2020 ◽  
Keyword(s):  
Mass Spectrometry ◽  
Condensation Reaction ◽  
Azomethine Nitrogen ◽  
Synthesis And Characterization ◽  
Stoichiometric Ratio ◽  
Significant Activity ◽  
Visible Spectroscopy ◽  
Thiol Form ◽  
Uv Visible

Complex iron(III) salicylaldehyde thiosemicarbazone with a formula Na[Fe(STSC)2] have been synthesized. Ligand, salicylaldehyde thiosemicarbazone (SCT) was prepared through the condensation reaction of salycilaldehide with thiosemicarbazide. Na[Fe(STSC)2] has been synthesized by reacting FeCl3 with thiosemicarbazide based ligand bearing ONS donor atoms. Complex has been formulated and characterized by mass spectrometry, infrared and UV/visible spectroscopy. The facts showed the formation of a complex in metal:ligand stoichiometric ratio 1:2. The ligand is coordinated as an ONS tridentate dianion via oxygen atom after the deprotonation of the phenolic OH-group, azomethine nitrogen and sulphur in thiol form of the deprotonated thiosemicarbazide residue. Antioxidant activity was determined, where ligand showed significant activity, while complex, at low concentration, exhibited almost no activity.

scholarly journals Preparation and Characterization of the Schiff Base Ligand (E)- N-(3-nitrobenzylidene) isonicotinohydrazide and its Silver (I) Complex [Ag(NNBIH)2]+

2012 ◽  
Vol 9 (2) ◽  
pp. 191-195
Author(s):  
SHAHRIAR GHAMMAMY ◽  
SAJJAD SEDAGHAT
Keyword(s):  
Thermal Decomposition ◽  
Schiff Base ◽  
Schiff Base Ligand ◽  
Synthesis And Characterization ◽  
Nitrate Salt ◽  
Visible Spectroscopy ◽  
Multistage Processes ◽  
Ft Ir ◽  
Uv Visible

We describe the synthesis and characterization of a new silver (I) complex of the Schiff base ligand (E) - N-(3-nitrobenzylidene) is onicotinohydrazide that abbreviated as NNBIH was synthesized and characterized. Ag (I) Metal complex of this Schiff base ligand prepared by reaction of nitrate salt of Ag (I) with NNBIH. Characterization of the ligand was made by microanalyses, FT-IR, UV–Visible spectroscopy and its complex was made by microanalyses, FT-IR and UV–Visible spectroscopy. TG- DTA and other analytical methods have been applied to the investigation of the thermal behavior and Structure of the compound [Ag(NNBIH)2]+. Thermal decomposition of these compounds is multistage processes.

scholarly journals Synthesis and characterization of heterocyclic substituted fluoran compounds

2007 ◽  
Vol 72 (11) ◽  
pp. 1039-1044
Author(s):  
Sachin Patel ◽  
Manish Patel ◽  
Ranjan Patel
Keyword(s):  
Sulphuric Acid ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Synthesis And Characterization ◽  
Spectroscopic Methods ◽  
Keto Acid ◽  
Visible Spectroscopy ◽  
Uv Visible ◽  
Quinazolinone Derivatives

New quinazolinone-substituted fluoran compounds were synthesized by reaction of keto acid, 2?-carboxy-2-hydroxy-4-N-pyrrolidinylbenzophenone with different quinazolinone derivatives in the presence of conc. sulphuric acid. All the synthesized fluoran compounds were characterized by spectroscopic methods (IR, 1H-NMR and UV-visible spectroscopy) and elemental analysis. The fluoran compounds are colorless or nearly colorless and develop color on contact with electron-accepting compounds.

scholarly journals Synthesis and characterization of ether linkage containing bis-fluoran compounds

2003 ◽  
Vol 68 (8-9) ◽  
pp. 607-613 ◽  
Author(s):  
Ritesh Patel ◽  
Jignesh Patel ◽  
Manish Patel ◽  
Rawan Patel
Keyword(s):  
Acetic Acid ◽  
Organic Solvent ◽  
Potassium Carbonate ◽  
Synthesis And Characterization ◽  
Dimethyl Formamide ◽  
Visible Spectroscopy ◽  
Acidic Media ◽  
Ether Linkage ◽  
Uv Visible

2?-chloro-6?-diethylaminofluoran and 2?-chloro-3?-methyl-6?-diethylaminofluoran were reacted with various diphenols in dimethyl formamide in the presence of potassium carbonate to give the related bisfluoran compounds. All the synthesized derivatives were identified by conventional methods (IR, 1H-NMR), elemental analysis and UV-visible spectroscopy in organic solvent and 95 % acetic acid. All the fluoran compounds change their color in acidic media.

scholarly journals Synthesis and characterization of erbium trioxide nanoparticles as photocatalyzers for degradation of methyl orange dye

2019 ◽  
Vol 12 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Rifat Mohammed Dakhil ◽  
Tayser Sumer Gaaz ◽  
Ahmed Al-Amiery ◽  
Mohd S. Takriff ◽  
Abdul Amir H. Kadhum
Keyword(s):  
Methyl Orange ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Uv Visible ◽  
Methyl Orange Dye ◽  
Microscopy Techniques ◽  
Degradation Of Methyl Orange

Abstract. The present work focuses on the photocatalytic degradation of methyl orange (MO) on erbium trioxide nanoparticles (Er2O3 NPs). In this study, Er2O3 nanoparticles were synthesized and fully characterized via various techniques, including X-ray diffraction, UV–visible spectroscopy and scanning electron microscopy techniques. The results revealed that the photocatalytic activity of the prepared Er2O3 NPs was manifested in MO photodegradation. The optimum efficiency obtained was 16 %.

scholarly journals Synthesis, Spectroscopic Properties of Nickel (II) Complex of the new Bis amide Ligand N, N’- alkanelid bis amide [Ni(NABA)]+

2012 ◽  
Vol 9 (1) ◽  
pp. 129-132
Author(s):  
Shahriar Ghammamy
Keyword(s):  
Metal Complex ◽  
Spectroscopic Properties ◽  
Synthesis And Characterization ◽  
Chloride Salt ◽  
Visible Spectroscopy ◽  
Ft Ir ◽  
Uv Visible

We describe the synthesis and characterization of a new Nickel (II) complex of the bis amide ligand N, N’- alkanelid bis amide that abbreviated as NABA was synthesized and characterized. Ni (II) Metal complex of this bis amide ligand was prepared by reaction of chloride salt of Ni (II) with NABA. Characterization of the ligand was made by microanalyses, FT-IR,1HNMR and its complex was made by microanalyses, FT-IR and UV–Visible spectroscopy.

Synthesis and characterization of 1,4-diazophenylenebridged Cu-phthalocyanine polymer

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
Cemil Alkan ◽  
Leyla Aras ◽  
Güngör Gündüz
Keyword(s):  
Electrical Conductivity ◽  
Diazonium Salt ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Uv Visible ◽  
Soluble Part

Abstract A novel type of phthalocyanine polymer, 1,4-diazophenylene-bridged Cuphthalocyanine, was prepared from the diazonium salt of diaminobenzene and Cu(II) 1,8,15,22-tetraaminophthalocyanine. The polymer is partially soluble in tetrahydrofuran, dichloromethane, and dimethylformamide. Characterization of the polymer was performed by IR and UV-visible spectroscopy, X-ray diffraction, ash analysis, viscometry, differential scanning calorimetry and thermogravimetric analysis. The molecular weight of the soluble part of the polymer was determined by ebullioscopy. Electrical conductivity of the polymer and its doped samples were determined by the 4-probe technique. It was found that the electrical conductivity increased up to 10-4 S/cm after doping. The redox behaviour of the polymer was investigated utilizing cyclic voltammetry.

scholarly journals Synthesis and Characterization of some Mixed Ligand Complexes Containing (8-hydroxyquinoline) and (2 - picoline) with some Metal Ions

2013 ◽  
Vol 10 (2) ◽  
pp. 396-404
Author(s):  
Baghdad Science Journal
Keyword(s):  
Magnetic Susceptibility ◽  
Metal Ions ◽  
Molar Conductivity ◽  
Mixed Ligand ◽  
Synthesis And Characterization ◽  
Conductivity Measurements ◽  
Visible Spectroscopy ◽  
Ft Ir ◽  
Uv Visible

Complexes of some metal ions ( Mn(I? ) , Co(??) , Ni(??) ,Cu (??) , Zn(I?) , Cd (??) , and Hg(??) ) with 8-hydroxyquinoline (Oxine) and 2- Picoline (2-pic ) have been synthesized and characterized on the basis of their FT-IR. and Uv-visible spectroscopy ,atomic absorption molar conductivity measurements and magnetic susceptibility ,from the results obtained the following general formula has been given for prepared complexes [M (oxine)2 (2-pic)2]where M = M(??) = Mn , Co , Ni , Cu , Zn , Cd , Hg(oxine)- = ionic ligand 8-hydroxyquinolin (oxinato)(2- pic) = 2- picoline

scholarly journals Synthesis and Characterization of Zinc Oxide Nanoparticles Using Acacia caesia Bark Extract and Its Photocatalytic and Antimicrobial Activities

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1507
Author(s):  
Jayachandran Ashwini ◽  
T. R. Aswathy ◽  
Anil Babu Rahul ◽  
Gautham M. Thara ◽  
Achuthsankar S. Nair
Keyword(s):  
Green Synthesis ◽  
Zno Nanoparticles ◽  
Methyl Blue ◽  
Synthesis And Characterization ◽  
Bark Extract ◽  
Average Crystalline Size ◽  
Visible Spectroscopy ◽  
Characteristic Peak ◽  
Uv Visible

This paper presents the green synthesis and characterization of ZnO nanoparticles and their microbial and photocatalytic application. The green synthesis of ZnO nanoparticles was carried out using Zinc nitrate hexahydrate and the bark extract of Acacia caesia (L.) Willd. The nanoparticles were synthesized at an optimum temperature of 65 °C followed by calcination at 400 °C. The samples were characterized using UV-visible spectroscopy, SEM, XRD, FTIR and EDX analysis. UV-visible spectroscopy showed a characteristic peak at 338 nm and the bandgap energy was found to be 3 eV which is specific for ZnO. SEM confirmed the presence of ZnO on its nanoscale. EDX gave the elemental details of Zinc constituting to 37.77% and Oxygen comprising 20.77% of its atomic weight. XRD analysis gave the diffractogram indexed at various angles corresponding to ZnO nanoparticles. It also revealed the average crystalline size to be 32.32 nm and the shape was found to be hexagonal. The functional group present in the nanoparticles was characterized using FTIR, which gave a characteristic peak at 485 cm−1. The synthesized nanoparticles exhibited significant photocatalytic (methyl blue under UV irradiation). The presence of nanoparticles induces changes in its kinetics, whose rate constants and correlation coefficients were analyzed during the photocatalytic degradation of the model pollutant Methyl Blue. Studies on antibacterial (Escherichia coli, Staphylococcus aureus), antifungal (Aspergillus niger, Candida albicans) and anti-inflammatory (COX assay) properties were also carried out. The nanoparticles were synthesized in an eco-friendly and cost-effective method. The study opens new horizons in the field of water treatment, biosensors and nanotechnology.

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