Amidoximated functionalized sodium alginate graft copolymer: An effective adsorbent for rapid removal of cationic dyes

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.

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Rapid removal of cationic dyes from water by coprecipitation with aluminum hydroxide and sodium dodecyl sulfate

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2013.11.015 ◽

2014 ◽

Vol 2 (1) ◽

pp. 752-758 ◽

Cited By ~ 18

Author(s):

Tohru Saitoh ◽

Makoto Saitoh ◽

Chisato Hattori ◽

Masataka Hiraide

Keyword(s):

Sodium Dodecyl Sulfate ◽

Aluminum Hydroxide ◽

Sodium Dodecyl ◽

Cationic Dyes ◽

Dodecyl Sulfate ◽

Rapid Removal

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A Study of Biodegradable Superabsorbent Materials Based on Acrylonitrile Grafted Sodium Alginate

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.277-279.450 ◽

2005 ◽

Vol 277-279 ◽

pp. 450-454 ◽

Cited By ~ 5

Author(s):

Young Hee Lee ◽

Jung Soo Kim ◽

Han Do Kim

Keyword(s):

Enzymatic Hydrolysis ◽

Sodium Alginate ◽

Graft Copolymer ◽

Graft Copolymerization ◽

Water Absorbency ◽

Grafted Copolymer ◽

Subsequent Hydrolysis ◽

Maximum Water ◽

Hydrolysis Conditions ◽

Hydrolysis Of

Biodegradable superabsorbents, hydrolyzed AN(acrylonitrile)-grafted-SA(sodium alginate) copolymers were prepared in this study by graft copolymerization of acrylonitrile on sodium alginate and the subsequent hydrolysis of the resulting grafted copolymer. The absorbency was found to significantly depend on the % add-on, graft copolymerization conditions and hydrolysis conditions. The optimum condition for graft copolymerization to obtain the maximum % add-on (64.5%) was 4g SA, 12g AN, and 8.42g H2O2 in 100ml water at 70 oC for 10hr., respectively. The optimum hydrolysis conditions for the graft copolymer (64.5 % add-on) to reach the maximum water absorbency (2518g/g), saline absorbency (1558g/g), and WRV (288g/g) is 1g graft copolymer in 10 ml aqueous NaOH (1.0N) at 110 oC for 1 hr. Furthermore, this hydrolyzed AN-graft-SA showed a good biodegradability in enzymatic hydrolysis tests when compared with commercial superabsorbent materials.

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