scholarly journals Study of Synthesis and Flocculation Properties of New Modified Hydrophobic Organic Polymer P(AM-DM-DMC12)

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Wei Guo ◽  
Huanzhen Zhang ◽  
Zhuohui Ma
Keyword(s):  
Mass Fraction ◽  
Removal Rate ◽  
Organic Polymer ◽  
Molar Ratio ◽  
Application Range ◽  
H Nmr ◽  
Redox Initiator ◽  
Initiator System ◽  
Ft Ir ◽  
Cod Removal Rate

A new modified hydrophobic organic polymer P(AM-DM-DMC12) is synthesized by free radical polymerization of three monomers in aqueous solution using a REDOX initiator system. Its structure is characterized by FT-IR and 1H-NMR, the effect of reaction conditions on the product is studied, and the flocculation performance and mechanism are discussed with the aim of wastewater turbidity and COD removal rate. The results showed that the synthesized compounds accorded with the target structure, and the optimum synthetic conditions are as follows: the molar ratio of AM, DM, and DMC12 is 4 : 1 : 1, total mass fraction of monomer is 35%, the mass fraction of redox initiator is 0.06%, and the molecular weight of P(AM-DM-DMC12) is 1.02×107. Moreover, the flocculation effect of P(AM-DM-DMC12) is obviously better than that of PAM, and it has the advantages of short flocculation time, low dosage, and wide application range of pH and has a good industrial application value and prospect.

Reaction of 2-[(2-aminoethyl)amino]ethanol with pyridine-2-carbaldehyde and complexation of the products with CuII and CdII along with docking studies

2019 ◽  
Vol 75 (7) ◽  
pp. 951-959 ◽  
Author(s):  
Zahra Mardani ◽  
Mohammad Hakimi ◽  
Keyvan Moeini ◽  
Fabian Mohr
Keyword(s):  
Crystal Packing ◽  
Docking Studies ◽  
Molar Ratio ◽  
Distorted Octahedral Geometry ◽  
X Ray Diffraction ◽  
Donor Ligand ◽  
X Ray ◽  
H Nmr ◽  
Distorted Octahedral ◽  
Ft Ir

The reaction between 2-[2-(aminoethyl)amino]ethanol and pyridine-2-carbaldehyde in a 1:2 molar ratio affords a mixture containing 2-({2-[(pyridin-2-ylmethylidene)amino]ethyl}amino)ethanol (PMAE) and 2-[2-(pyridin-2-yl)oxazolidin-3-yl]-N-(pyridin-2-ylmethylidene)ethanamine (POPME). Treatment of this mixture with copper(II) chloride or cadmium(II) chloride gave trichlorido[(2-hydroxyethyl)({2-[(pyridin-2-ylmethylidene)amino]ethyl})azanium]copper(II) monohydrate, [Cu(C10H16N3O)Cl3]·H2O or [Cu(HPMAE)Cl3]·H2O, 1, and dichlorido{2-[2-(pyridin-2-yl)oxazolidin-3-yl]-N-(pyridin-2-ylmethylidene)ethanamine}cadmium(II), [CdCl2(C16H18N4O)] or [CdCl2(POPME)], 2, which were characterized by elemental analysis, FT–IR, Raman and 1H NMR spectroscopy and single-crystal X-ray diffraction. PMAE is potentially a tetradentate N3O-donor ligand but coordinates to copper here as an N2 donor. In the structure of 1, the geometry around the Cu atom is distorted square pyramidal. In 2, the Cd atom has a distorted octahedral geometry. In addition to the hydrogen bonds, there are π–π stacking interactions between the pyridine rings in the crystal packing of 1 and 2. The ability of PMAE, POPME and 1 to interact with ten selected biomolecules (BRAF kinase, CatB, DNA gyrase, HDAC7, rHA, RNR, TrxR, TS, Top II and B-DNA) was investigated by docking studies and compared with doxorubicin.

scholarly journals Synthesis of a Cationic Polyacrylamide under UV Initiation and Its Flocculation in Estrone Removal

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Jiaoxia Sun ◽  
Xiqin Ma ◽  
Xiang Li ◽  
Jianxin Fan ◽  
Qingkong Chen ◽  
...  
Keyword(s):  
Ammonium Chloride ◽  
Removal Rate ◽  
Phenyl Group ◽  
Resonance Spectroscopy ◽  
Scanning Calorimetry ◽  
Floc Size ◽  
Cationic Polyacrylamide ◽  
H Nmr ◽  
Ft Ir ◽  
Dsc Analyses

A ternary cationic polyacrylamide (CPAM) with the hydrophobic characteristic was prepared through ultraviolet- (UV-) initiated polymerization technique for the estrone (E1) environmental estrogen separation and removal. The monomers of acrylamide (AM), acryloyloxyethyl-trimethyl ammonium chloride (DAC), and acryloyloxyethyl dimethylbenzyl ammonium chloride (AODBAC) were used to synthesize the ternary copolymer (PADA). Fourier transform infrared spectroscopy (FT-IR), 1H nuclear magnetic resonance spectroscopy (1H NMR), thermogravimetry/differential scanning calorimetry (TG/DSC), and scanning electron microscopy (SEM) were employed to characterize the structure, thermal decomposition property, and morphology of the polymers, respectively. FT-IR and 1H NMR results indicated the successful formation of the polymers. Besides, with the introduction of hydrophobic groups (phenyl group), an irregular and porous surface morphology and a favorable thermal stability of the PADA were observed by SEM and TG/DSC analyses, respectively. At the optimal condition (pH = 7, flocculant dosage = 4.0 mg/L and E1 concentration = 0.75 mg/L), an excellent E1 flocculation performance (E1 removal rate: 90.1%, floc size: 18.3 μm, and flocculation kinetics: 22.69×10-4 s−1) was acquired by using the efficient flocculant PADA-3 (cationic degree = 40%, and intrinsic viscosity = 6.30 dL·g−1). The zeta potential and floc size analyses were used to analyze the possible flocculation mechanism for the E1 removal. Results indicated that the charge neutralization, adsorption, and birding effects were dominant in the E1 removal progress.

scholarly journals Functionalization and Chemical Modification of 2-Hydroxyethyl Methacrylate with Carboxylic Acid

2012 ◽  
Vol 9 (3) ◽  
pp. 1135-1144 ◽  
Author(s):  
Mohammad Hossein Nasirtabrizi ◽  
L. Zargin ◽  
S. Khodabandlou ◽  
S. Rostamzadeh Mansour
Keyword(s):  
Thermal Analysis ◽  
Free Radical ◽  
Carboxylic Acid ◽  
Addition Reaction ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Hydroxyethyl Methacrylate ◽  
H Nmr ◽  
Temperature Ranges ◽  
Ft Ir

Free radical polymerization of the resulting monomers methyl methacrylate (MMA), ethyl methacrylate (EMA), methylacrylate (MA) and ethylacrylate (EA) with 2-hydroxyethyl methacrylate (HEMA) (in 1:1 mole ratio) were carried out using azobis(isoboutyronitrile) (AIBN) as initiator at the temperature ranges 60-70°C. The modification of polymers were carried out by 9-anthracenecarboxylic acid (9-ACA) via the esterification reaction between —OH of poly(HEMA) and —COOH of 9-ACA, in presence of N,N′-dicyclohexyl-carbodiimide (DCC), 4-(dimethylamino) pyridine (DMAP) and N,N-dimethyl formamid (DMF). It was found that the molar ratio acid/alcohol/catalysts= 0.02: 0.02: 0.02 and 0.002, optimal for preparation of the ester. As demonstrated by FT-IR,1H-NMR and dynamic mechanical thermal analysis (DMTA). The Tg value of methacrylate and acrylate copolymers containing 9-ACA groups was found to increase with incorporation of 9-ACA groups in polymer structures. The presence of 9-ACA groups in the polymer side chains created new polymers with novel modified properties that find some applications in polymer industry. These anthracenic factors could take part in cyclo addition reaction with other factors such as anhydrides and kinons.

Quantitative Analysis of Polyacrylamide Grafted on Polylactide Film Surfaces Employing Spectroscopic Techniques

2017 ◽  
Vol 71 (11) ◽  
pp. 2457-2468
Author(s):  
Mijanur Rahman ◽  
Pakorn Opaprakasit
Keyword(s):  
Quantitative Analysis ◽  
Proton Nuclear Magnetic Resonance ◽  
Spectroscopic Techniques ◽  
H Nmr ◽  
Initiator System ◽  
Ft Ir ◽  
Time Ease ◽  
Standard Techniques ◽  
Good Agreement ◽  
Ft Ir Spectroscopy

Standard techniques for quantitative measurement of polyacrylamide (PAm) contents grafted on polylactide (PLA) film substrates, P(LA- g-Am- co-MBAm), which are commonly used as cell culture substrates or scaffolds, and pH-sensitive absorbents have been developed with X-ray photoelectron (XPS), proton-nuclear magnetic resonance (1H-NMR), and Fourier transform infrared (FT-IR) spectroscopy. The techniques are then applied to examine P(LA- g-Am- co-MBAm) samples prepared from two separate photo-initiator/co-initiator systems. Efficiency and accuracy of the techniques are compared. The results from all techniques are in good agreement, indicating high analysis precisions, although FT-IR technique provides additional advantages, in terms of short analysis time, ease of sample preparation, and accessibility of a machine. The results indicate that the riboflavin (RF) initiator system has higher grafting efficiency than its camphorquinone (CQ) counterpart. These standard techniques can be applied in the analysis of these materials and further modified for quantitative analysis of other grafting systems.

Experimental Study on the Supercritical Water Co-Oxidation of Municiple Sludge with Methanol

2014 ◽  
Vol 651-653 ◽  
pp. 1341-1344
Author(s):  
Sheng Wen ◽  
Shu Zhong Wang ◽  
Yan Hui Li ◽  
Yu Zhen Wang
Keyword(s):  
Experimental Study ◽  
Acetic Acid ◽  
Co Oxidation ◽  
Ring Opening ◽  
Mass Fraction ◽  
Oxidation Process ◽  
Removal Rate ◽  
Methanol Solution ◽  
Cod Removal ◽  
Cod Removal Rate

The influence of methanol on the sludge removal rate of COD was investigated and the mechanism was obtained. The results show that the adding of methanol solution can improve the sludge COD removal rate, when the mass fraction of methanol is 5%, COD removal rate can be highly 99.98% compared 98.26% of that without methanol. The mechanism of co-oxidation is that methanol oxidation process can produce free radicals HO· and HO2·, they attack intermediate phenol and acetic acid, promote acetic acid to C-C bond fracture and ring-opening of phenol.

A Study on the Preparation and Flocculation Properties of Boracic Poly-Aluminum-Ferric-Silicate

2013 ◽  
Vol 726-731 ◽  
pp. 3025-3029 ◽  
Author(s):  
Xiao Wei Tian ◽  
Chun Ying Han ◽  
Li Dan Zhang ◽  
Wei Zhao Du ◽  
Zeng He Li
Keyword(s):  
Removal Rate ◽  
Water Solution ◽  
Molar Ratio ◽  
Sodium Borate ◽  
Rapid Coagulation ◽  
Ft Ir ◽  
High Removal Rate ◽  
Micro Morphology ◽  
Polymerization Method ◽  
Electronic Microscope

The boracic poly-aluminum-ferric-silicate (B-PSAF) coagulant was prepared by water solution co-polymerization method, which was synthesized from sodium silicate, aluminum sulfate, ferric chloride and sodium borate. In addition, the best molar ratio of boron and silicon was determined by single factor process. The micro-morphology and structure of B-PSAF were studied by scanning electronic microscope (SEM) and Fourier transform infrared spectrum (FT-IR). It has been studied the operation of B-PSAF as the flocculating agent, the dosage and its effects on the flocculability. Experiments show that B-PSAF is a good effective flocculant, which can be used to treat alkaline dyeing wastewater and it has the features of less consumption, rapid coagulation and high removal rate of CODCr.

Preparation of Polycarboxylate Terpolymer High Performance Water Reducer of MA-AA-F108

2012 ◽  
Vol 581-582 ◽  
pp. 246-251
Author(s):  
Jia Le Song ◽  
Hong Ping Wen ◽  
Chang Liang Lv ◽  
Zhi Mi Zhou ◽  
Wei Guang Li
Keyword(s):  
Aqueous Solution ◽  
Mass Fraction ◽  
High Performance ◽  
Raw Materials ◽  
Molar Ratio ◽  
Optimum Conditions ◽  
Oxidation Reduction ◽  
Initiator System ◽  
Dispersing Ability ◽  
Polymerization Conditions

In aqueous solution, the modified polyether (F108), maleic anhydride (MA), acrylic acid (AA) as raw materials, a novel polycarboxylate high performance water reducer of MA-AA-F108 was synthesised from free radical copolymerized through oxidation-reduction initiator system. Additionally, the polymerization conditions were optimized. The results indicate that the copolymer can be prepared under such optimum conditions, i.e., 3:3:2 molar ratio of MA, AA and F108, 0.5% of the mass fraction of oxidation initiator, 0.6% of the mass fraction of reduced initiator and 0.3% of the mass fraction of regulator, the results showed that the polyether-type polycarboxylic water reducer has excellent dispersing ability.

scholarly journals Cooligomers from morpholine-2,5-dione and para-dioxanone and catalyst complex SnOct2/2-hydroxyethyl sulfide

MRS Advances ◽  
2021 ◽  
Author(s):  
Xiao Liang ◽  
Marc Behl ◽  
Karola Luetzow ◽  
Andreas Lendlein
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Building Blocks ◽  
Ring Opening Polymerization ◽  
Molar Ratio ◽  
Feed Ratio ◽  
H Nmr ◽  
Catalyst Complex ◽  
Initiator System ◽  
Specific Number

Abstract Complexes from catalysts and initiator can be used to insert a specific number of additional chemical functional groups in (co)polymers prepared by ring-opening polymerization (ROP) of lactones. We report on the synthesis of cooligomers from sec-butyl-morpholine-2,5-dione (SBMD) and para-dioxanone (PDX) by ROP with varied feed ratios in the bulk using the catalyst complex SnOct2/2-hydroxyethyl sulfide. Mn of the cooligomers (determined by GPC) decreased with decreasing SBMD feed ratio from 4200 ± 420 to 800 ± 80 g mol−1. When the feed ratio was reduced from 80 to 50 mol% the molar ratio of SBMD of the cooligomers (determined by 1H-NMR) remained nearly unchanged between 81 and 86 mol% and was attributed to a higher reactivity of SBMD. This assumption was confirmed by fractionation of GPC, in which an increase of SBMD with increasing molecular weight was observed. The catalyst/initiator system provides a high potential to create orthogonal building blocks by cleavage of the sulfide bond. Graphic abstract

SYNTHESIS AND CHARACTERIZATION OF THE ANTIMICROBIAL 4-AMINO-DECYLPYRIDINIUM BROMIDE CATIONIC SURFACTANT

2008 ◽  
Vol 15 (05) ◽  
pp. 531-536 ◽  
Author(s):  
PARAG MADAAN ◽  
V. K. TYAGI
Keyword(s):  
Surface Active Agent ◽  
Maximum Yield ◽  
Active Agent ◽  
Analytical Techniques ◽  
Molar Ratio ◽  
E Coli ◽  
H Nmr ◽  
Concentration Method ◽  
Inhibition Concentration ◽  
Ft Ir

4-Amino-decylpyridinium bromide (ADPBr), an antimicrobial surface active agent, was synthesized by quaternization of 4-aminopyridine (AP) with decyl bromide (DBr). The reaction was carried out at 1:1.2 molar ratio of reactants (4-aminopyridine and decyl bromide, respectively) at 200°C for 10 min. The maximum yield of the product was 74.6%. The structure of the synthesized product was characterized by using modern analytical techniques, such as FT-IR, 1 H NMR, and 13 C NMR. The antimicrobial activity of the salt was evaluated with minimum inhibition concentration method and showed good activity against gram-negative bacteria. The MIC of the salt was found to be 600 ppm for 2 × 104 CFU/mL of E. coli.

scholarly journals Dehalogenation of chlorobromophenol by ozonation using heterogeneous catalyst

2016 ◽  
Vol 18 (2) ◽  
pp. 242-250 ◽  
Keyword(s):  
Oxalic Acid ◽  
Metal Oxides ◽  
Heterogeneous Catalyst ◽  
Aqueous System ◽  
Molar Ratio ◽  
Reaction Products ◽  
H Nmr ◽  
Titania Surface ◽  
Ft Ir ◽  
Ir Analysis

<div> <p>Ozone initiated oxidation of 2-chloro,4-bromophenol, (CBP) in aqueous system catalyzed by 1, 2.5 and 5% loadings of 1:1 molar ratio of Ce-Zr oxide on TiO<sub>2</sub> were studied. The synthesized catalysts were characterized via BET, ICP, PXRD, TPD, TEM, SEM, and FT-IR analysis. The powder XRD data revealed that Ce-Zr exists in three different phases on titania. SEM and SEM-EDX confirmed well dispersed metal oxides on titania surface. <sup>1</sup>H NMR, IR and GC-MS positively confirm hydroxyfumaric acid (HFA) and oxalic acid (OA) as reaction products. 5% Ce-Zr/TiO<sub>2</sub> showed best performance with100 % conversion in 4 h.&nbsp;</p> </div> <p>&nbsp;</p>

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