Adsorption of cationic dyes on poly(acrylic acid-co-sodium acrylate-co-acrylamide) superabsorbents

2011 ◽  
Vol 124 (5) ◽  
pp. 3892-3899 ◽  
Author(s):  
Neelesh Bharti Shukla ◽  
Giridhar Madras
Keyword(s):  
Acrylic Acid ◽  
Cationic Dyes ◽  
Sodium Acrylate ◽  
Poly Acrylic Acid

scholarly journals Removal of Water from Water-in-crude Oil Emulsions with Poly[(acrylic acid)-co-(sodium acrylate)] as Water-absorptive-polymers

2018 ◽  
Vol 61 (2) ◽  
pp. 59-71
Author(s):  
Chiyu Nakano ◽  
Yuta Takada ◽  
Yutaro Chida ◽  
Sumio Kato ◽  
Masataka Ogasawara ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Crude Oil ◽  
Sodium Acrylate ◽  
Oil Emulsions ◽  
Poly Acrylic Acid

Adsorption of Dyes onto Sodium Alginate Graft Poly(Acrylic Acid-co-2-Acrylamide-2-Methyl Propane Sulfonic Acid)/ Kaolin Hydrogel Composite

2017 ◽  
Vol 25 (8) ◽  
pp. 627-634 ◽  
Author(s):  
Linhui Zhu ◽  
Chengdong Guan ◽  
Bin Zhou ◽  
Zhentao Zhang ◽  
Rui Yang ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Sodium Alginate ◽  
Xylenol Orange ◽  
Methyl Violet ◽  
Cationic Dyes ◽  
Anionic Dyes ◽  
Hydrogel Composite ◽  
Adsorption Capacities ◽  
Initial Ph ◽  
Poly Acrylic Acid

Adsorption of four dyes, namely methyl violet (MV), rhodamine 6G (R6G), acid chrome blue K (AK) and xylenol orange (XO) onto sodium alginate graft poly(acrylic acid-co-2-acrylamide-2-methyl-1-propanesulfonicacid)/kaolin (SA-g-P(AA-co-AMPS)/KL) hydrogel composite is studied. The factors influencing the adsorption capacities, including the initial concentrations of dye solutions, contact time, initial pH values and dosage of the adsorbent as well as ionic strength of the solution are discussed. It is more effective for the composite to adsorb cationic dyes such as MV and R6G rather than anionic dyes AK and XO. The maximum adsorption capacities of MV, R6G, AK and XO are 1361.1, 1627.8, 563.5 and 312.4 mg/g, respectively. The adsorption thermodynamics for the four dyes are in accordance with both the Freudlich and Redlich-Peterson equations. It is shown that adsorption of the cationic dyes R6G and MV is spontaneous, while that of anionic dyes AK and XO is not. The kinetics studies show that the adsorption of the four dyes fitted a pseudo-second-order equation.

Degree of branching in poly(acrylic acid) prepared by controlled and conventional radical polymerization

2019 ◽  
Vol 10 (19) ◽  
pp. 2469-2476 ◽  
Author(s):  
Alison R. Maniego ◽  
Adam T. Sutton ◽  
Yohann Guillaneuf ◽  
Catherine Lefay ◽  
Mathias Destarac ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Radical Polymerization ◽  
Sodium Acrylate ◽  
Degree Of Branching ◽  
Poly Acrylic Acid

Poly(acrylic acid)s, PAAs and poly(sodium acrylate)s, PNaAs were characterized in detail.

Nanoscale Elastic and Tribological Properties of Poly(Acrylic Acid) Superabsorbent Gels

2008 ◽  
Vol 1085 ◽  
Author(s):  
Beatriz Talavera ◽  
Juan J. Martínez ◽  
Francisca Santiago ◽  
M. Teresa Cuberes
Keyword(s):  
Acrylic Acid ◽  
Sodium Hydroxide ◽  
Sodium Acrylate ◽  
Water Molecules ◽  
Friction Force Microscopy ◽  
Ambient Conditions ◽  
Force Microscopy ◽  
Topographic High ◽  
Poly Acrylic Acid

ABSTRACTUltrasonic Force Microscopy and Friction Force Microscopy have been applied to the characterization of the elastic and tribological responses of poly(acrylic acid) hydrogels at ambient conditions. The gels were prepared by free radical polymerization of acrylic acid monomers partially neutralized by sodium hydroxide, using N, N'-methylen-bis-acrylamide as a crosslinker. Nanoscale domains with different stiffness and friction are observed. Increasing the amount of crosslinker leads to the formation of smaller, more densely packed domains. The domains with higher stiffness also exhibit higher friction and lower topographic high. The results can be understood by assuming that (i) neutralization by sodium hydroxide leads to the formation of both acrylic acid and sodium acrylate polymeric strands (ii) the observed domains differ in their acrylic acid / sodium acrylate content. In the acrylic acid rich domains, hydrogen bonding among the polymeric strands explains a higher stiffness and lower topography. In the sodium acrylate rich domains, lubrication by water molecules linked by solvation to the sodium counterions accounts for a lower friction.

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