scholarly journals Preparation and Applications of Salt-Resistant Superabsorbent Poly (Acrylic Acid-Acrylamide/Fly Ash) Composite

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 596 ◽  
Author(s):  
Wenjuan Zhu ◽  
Yagang Zhang ◽  
Penglei Wang ◽  
Zhiyong Yang ◽  
Akram Yasin ◽  
...  
Keyword(s):  
Fly Ash ◽  
Acrylic Acid ◽  
Pure Water ◽  
Polymerization Temperature ◽  
Mass Ratio ◽  
Nacl Solution ◽  
Absorption Performance ◽  
Ft Ir ◽  
Optimized Conditions ◽  
Poly Acrylic Acid

Solution polymerization synthesized alt-resistant superabsorbent poly (acrylic acid-acrylamide/fly ash) composites. The mass ratio of acrylic acid (AA) to acrylamide (AM), the concentration of crosslinker, the neutralization degree (ND) of AA, and the polymerization temperature were investigated by single-factor method. Optimized conditions for the synthesis of poly (acrylic acid-acrylamide/fly ash) (PAA-AM/FA) are, as following: m (AA)/m (AM) is 1.5, the content of crosslinker N, N-methylenebisacrylamide. (MBA) is 0.7%, neutralization degree of AA is 70%, polymerization temperature is 70 °C, and fly ash (FA) content is 50%. The prepared PAA-AM/FA demonstrated superior water absorption performance. The absorption capacities of PAA-AM/FA for pure water and 0.9% NaCl solution were found to be 976 g·g−1 and 81 g·g−1, respectively. Furthermore, PAA-AM/FA was found to have excellent adsorption capacity (148 mg·g−1) for Rhodamine B in water. Fourier Transform-Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis (TGA), and Scanning Electron Microscopy (SEM) characterized the prepared materials. Results showed that fly ash was incorporated into the macromolecular polymer matrix and played a key role in improving the performance of the polymer composites.

Immobilization of urease in poly(1-vinyl imidazole)/poly(acrylic acid) network

2010 ◽  
Vol 64 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Mehmet Şenel ◽  
Agah Coşkun ◽  
M. Fatih Abasıyanık ◽  
Ayhan Bozkurt
Keyword(s):  
Acrylic Acid ◽  
Enzyme Immobilization ◽  
Storage Stability ◽  
Polymer Network ◽  
Ft Ir ◽  
Basic Characteristics ◽  
And Storage ◽  
Menten Constant ◽  
Ft Ir Spectroscopy ◽  
Poly Acrylic Acid

AbstractIn this study, urease was immobilized in a polymer network obtained by complexation of poly(1-vinyl imidazole) (PVI) with poly(acrylic acid) (PAA). Preparation of the polymer network was monitored by FT-IR spectroscopy. Scanning electron microscopy (SEM) revealed that enzyme immobilization had a strong effect on film morphology. Proton conductivity of the PVI/PAA network was measured via impedance spectroscopy under humidified conditions. Values of the Michaelis-Menten constant (K M) for immobilized urease were higher than for the free enzyme, indicating a decreased affinity of the enzyme to its substrate. The basic characteristics (pHopt, pHstability, T opt, T stability, reusability, and storage stability) of immobilized urease were determined. The results show that the PAA/PVI polymer network is suitable for enzyme immobilization.

Dual-Charge Nanofiber Mats Made of Chitosan(CS)/Poly(Vinyl Alcohol) (PVA) and Poly-(Acrylic Acid-Co-Maleic Acid) (PAMA)/PVA

2019 ◽  
Vol 819 ◽  
pp. 145-150
Author(s):  
Thapakorn Chareonying ◽  
Junnasir M. Sakilan ◽  
Theerasak Rojanarata ◽  
Prasopchai Patrojanasophon ◽  
Prasert Akkaramongkolporn ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Maleic Acid ◽  
Vinyl Alcohol ◽  
Electrospinning Process ◽  
Poly Vinyl Alcohol ◽  
Water Capacity ◽  
Ft Ir ◽  
Nanofiber Mats ◽  
Positively Charged ◽  
Poly Acrylic Acid

Nanofibers have been widely used for tissue engineering. Using charged polymers for the preparation of nanofibers can be useful for the loading of substances or macromolecules. Dual charge nanofiber mats are expected to be able to immobilize both positively charged and negatively charged substances in one versatile nanofiber mat. The purpose of this study was to prepare and characterize dual-charge nanofibers generated from poly (vinyl alcohol) (PVA)/poly-(acrylic acid-co-maleic acid) (PAMA) and chitosan (CS)/PVA. The polymer solutions of PAMA/PVA (1:1.63 w/w) and CS/PVA (1:2.33 w/w) were electrospun to form the nanofibers using dual-jet electrospinning process. The obtained dual-charge nanofibers were thermally crosslinked by leaving the nanofibers in the oven at 110-130 °C for 0.5, 1, 3, 5 h. The appearance of the nanofiber mat was characterized by a scanning electron microscope (SEM), and the diameter of nanofibers were determined by an image analysis software (J-micro vision®). The percentage water insolubilization and FT-IR spectra were also determined. The dual-size nanofiber mats with smooth and bead-free fibers were obtained. The diameter of the PAMA/PVA and CS/PVA fibers was 574.54 ± 142.98 nm and 225.69 ± 41.92 nm, respectively. The desirable temperature and time for the crosslink of the dual-charge nanofiber mats was 130 °C for 1 h which could provide a high insolubilization with water capacity of 93.22 ± 2.23%.

scholarly journals Mechanical Properties, Microstructure, and Chloride Content of Alkali-Activated Fly Ash Paste Made with Sea Water

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1467
Author(s):  
Salman Siddique ◽  
Jeong Gook Jang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Sea Water ◽  
Tap Water ◽  
Pure Water ◽  
Degree Of Polymerization ◽  
29Si Nmr ◽  
Water Based ◽  
Ft Ir ◽  
Alkali Activated

The aim of the present study is to investigate the potential of sea water as a feasible alternative to produce alkali-activated fly ash material. The alkali-activated fly ash binder was fabricated by employing conventional pure water, tap water, and sea water based alkali activating solution. The characteristics of alkali-activated materials were examined by employing compressive strength, mercury intrusion porosimetry, XRD, FT-IR, and 29Si NMR along with ion chromatography for chloride immobilization. The results provided new insights demonstrating that sea water can be effectively used to produce alkali activated fly ash material. The presence of chloride in sea water contributed to increase compressive strength, refine microstructure, and mineralogical characteristics. Furthermore, a higher degree of polymerization on the sea water-based sample was observed by FT-IR and 29Si NMR analysis. However, the higher amount of free chloride ion even after immobilization in sea water-based alkali-activated material, should be considered before application in reinforced structural elements.

scholarly journals Structural analysis of microbial poly(ɛ-L-lysine)/poly(acrylic acid) complex by FT-IR, DSC, and solid-state 13C and 15N NMR

2011 ◽  
Vol 44 (2) ◽  
pp. 200-203 ◽  
Author(s):  
Shiro Maeda ◽  
Yasuhiro Fujiwara ◽  
Chizuru Sasaki ◽  
Ko-Ki Kunimoto
Keyword(s):  
Solid State ◽  
Structural Analysis ◽  
Acrylic Acid ◽  
15N Nmr ◽  
Acid Complex ◽  
Ft Ir ◽  
Poly Acrylic Acid

Synthesis and Characteristics of Interpenetrating Polymer Network Hydrogels Based on Konjac Glucomannan with Different Molecular Weights and Poly(acrylic acid)

2011 ◽  
Vol 393-395 ◽  
pp. 1004-1007
Author(s):  
Xue Yao ◽  
Xue Gang Luo ◽  
Ben Chao Han
Keyword(s):  
Acrylic Acid ◽  
Enzymatic Degradation ◽  
Drug Carrier ◽  
Polymer Network ◽  
Konjac Glucomannan ◽  
Interpenetrating Polymer Network ◽  
Swelling Ratio ◽  
Molecular Weights ◽  
Ft Ir ◽  
Poly Acrylic Acid

Konjac glucomannan with different molecular weights/poly(acrylic acid) hydrogels were prepared in this paper. The structure of the IPN hydrogels was characterized by FT-IR and SEM. The swelling ratio of these hydrogels showed they had pH-sensitive properties and the enzymatic degradation tests showed the hydrogels retain the enzymatic degradation character of KGM. Furthermore, hydrogel composed of native KGM degraded sharply in enzymatic degradation test and it had bigger swelling ratio and weight loss ratio than those hydrogels which composed of lower molecular weights KGM. Therefore, hydrogels composed of lower molecular weight might release drug more stable when they were used as drug carrier.

Synthesis and Properties of Potassium-Containing Poly(Acrylic Acid Sodium-Co-Acrylamide)Fly Ash-Illite Superabsorbent Composite

2011 ◽  
Vol 239-242 ◽  
pp. 59-63
Author(s):  
Shang Yue Shen ◽  
Kai Sheng Xia ◽  
Hui Ling ◽  
Li Ren Fan
Keyword(s):  
Fly Ash ◽  
Acrylic Acid ◽  
Tap Water ◽  
Low Cost ◽  
Absorption Spectrometry ◽  
Soil Improvement ◽  
Good Effect ◽  
Republic Of China ◽  
Superabsorbent Composite ◽  
Poly Acrylic Acid

The fly ash with a loose and porous structure has definite absorbent ability, which has a good effect on soil improvement. Illite belongs to clay minerals, it has absorbent ability and higher potassium, which can improve the soil fertility. In this study, poly(acrylic acid sodium-co-acrylamide)(PAANa-AM)/fly ash-illite superabsorbent composite was firstly prepared by solution polymerization. The structures were characterized using scanning electron microscope, X-ray diffraction, and infrared spectrum. The results showed that the fly ash and illite dispersed well in the composite. The K+ in illite was replaced by Na+ in acrylic acid sodium and thus the illite structure turned into paragonite during the process of preparing composite, however, the structure of fly ash was maintained in the composite. Moreover, the hydroxide radical in illite reacted with the carbonyl group in acrylic acid during polymerization. The best absorbent capacities of the composite in distilled water, tap water and normal saline were 1695, 445 and 106 g/g, respectively, which exceeded the requirements of The National 863 Program and Ministry of Agriculture of People’s Republic of China. The potassium release was measured using atomic absorption spectrometry and the results indicated that the composite can release 12.80% of the potassium ion in fly ash and illite. The superabsorbent material has low cost and favors improvement of soil and potassium-deficiency.

Preparation and Characterization of Fly Ash and Aluminium Waste Geopolymer

2014 ◽  
Vol 608 ◽  
pp. 108-113
Author(s):  
Sujitra Onutai ◽  
Sirithan Jiemsirilers ◽  
Shigetaka Wada ◽  
Parjaree Thavorniti
Keyword(s):  
Fly Ash ◽  
Bending Strength ◽  
Three Dimensional ◽  
Mass Ratio ◽  
Amorphous Structures ◽  
Alumino Silicate ◽  
Ft Ir ◽  
Greenhouse Emission ◽  
Mae Moh

Geopolymeris an alumino-silicate material with three dimensional amorphous structures. The main compositions are silica and alumina which were decomposed by alkaline solution. Geopolymer materials not only have comparable or superior properties to portland cement, but also have lower greenhouse emission. In this study, Preparation and characterization of geopolymer were investigated. The main composition of fly ash from Mae Moh power plant is SiO2 and Al2O3. The major composition of Aluminium waste from aluminium frame industry is Al2O3.The geopolymer pastes were mixed at various proportions of FA:Al-waste of 100:0 80:20 60:40 and 40:60 by weight. Sodium hydroxide and sodium silicate were used as alkali activators.A mass ratio of 2.5 Na2SiO3/NaOH and three concentrations of NaOH (5 10 15 M) were used. Geopolymer were cured at ambient temperature for 7days. Properties of geopolymer specimens were measured for example compressive strength, bending strength, phase by XRD, and bonding by FT-IR.

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