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1

Effect of Ionic and Covalent Crosslinking of Hydrogel Chitosan Beads on the Adsorption Efficiency of Basic Violet 10 and Basic Green 4 Dyes From Aqueous Solutions

100%

Jóźwiak T., Filipkowska U., Filipkowska M.

Progress on Chemistry and Application of Chitin and its Derivatives

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2022

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vol. 27

116-134

EN

This work investigated the adsorption efficiency of Basic Violet 10 (BV10) and Basic Green 4 (BG4) dyes on ionically and covalently crosslinked chitosan hydrogel beads. The tested ionic crosslinkers were sodium citrate, sodium tripolyphosphate, and sulphosuccinic acid, while the covalent crosslinkers were glutaraldehyde, epichlorohydrin, and trimethylolpropane triglycidyl ether. The scope of the work included investigation of the effect of pH on the adsorption efficiency of dyes and the maximum adsorption capacity of crosslinked chitosan adsorbents. The maximum adsorption capacity of the non-crosslinked chitosan adsorbent was 2.94 mg/g and 44.32 mg/g for BV10 and BG4, respectively. Ionic crosslinking, regardless of the type of crosslinking agent, reduced the adsorption ability of hydrogel chitosan adsorbents in relation to cationic dyes (Qmax = 1.84-2.49 mg/g for BV10; 37.21-38.90 mg/g for BG4). Covalent crosslinking of chitosan slightly increased its adsorption capacity only for BV10 (Qmax = 3.59-3.81 mg/g for BV10; 39.15-40.62 mg/g for BG4).

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REMOVAL OF DYES FROM AQUEOUS SOLUTIONS BY GLAUCONITE IMMOBILISED ON CHITOSAN HYDROGEL BEADS

86%

Jóźwiak T., Filipkowska U., Szymczyk P., Kuczajowska-Zadrożna M., Mielcarek A.

Progress on Chemistry and Application of Chitin and its Derivatives

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2017

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vol. 22

54-65

EN

The sorption capacity of glauconite, glauconite immobilised on chitosan hydrogel beads and unmodified chitosan hydrogel beads against Reactive Black 5 and Basic Violet 10 was compared in this article. The effect of pH on the sorption effectiveness of dyes on the tested sorbents was investigated and the sorption capacity of sorbents after 24 and 72 h was determined. Langmuir sorption, double Langmuir and Freundlich isotherms were used to describe the experimental data. The adsorption efficiency of the dyes on sorbents containing chitosan was highest at pH 4. In the case of glauconite, Reactive Black 5 removal efficiency was the highest at pH 3, and Basic Violet 10 removal efficiency was highest at pH 2. The sorption capacity of glauconite immobilised on chitosan hydrogel spheres obtained after 72 h was -656.73 mg/g and -32.77 mg/g for Reactive Black 5 and Basic Violet 10, respectively.

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USE OF SAWDUST IMMOBILISED ON CHITOSAN FOR DISPOSAL OF DYES FROM WATER SOLUTIONS

86%

Szymczyk P., Filipkowska U., Jóźwiak T., Kuczajowska-Zadrożna M.

Progress on Chemistry and Application of Chitin and its Derivatives

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2017

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vol. 22

207 - 219

EN

In this article, the sorption properties of chitosan hydrogel beads, beech sawdust and sawdust immobilised on chitosan in relation to Reactive Black 5 (RB5) and Basic Violet 10 (BV10) dyes were compared. In the conducted research, the sorption capacities of the sorbents, sorption pH and the point of zero charge (pHZPC) were determined. For the description of the obtained results, the double Langmuir model has been used. The highest effectiveness of the cationic and anionic dye removal on chitosan hydrogel beads and sawdust immobilised on chitosan was obtained at pH 4, whereas on sawdust, the pH was 3. The best sorbent in relation to the RB5 dye was obtained using chitosan hydrogel beads, and in relation to BV10, it was sawdust. The maximum sorption capacity of chitosan in relation to RB5 was 875.66 mg/g, whereas the sorption capacity of sawdust in relation to BV10 was 30.15 mg/g. The research has shown that the sorbent in the form of sawdust immobilised on chitosan had a high sorption capacity in relation to anionic as well as cationic dyes. Immobilisation of sawdust on chitosan led to the creation of a universal sorbent in relation to cationic and anionic dyes.

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3 Progress on Chemistry and Application of Chitin and its Derivatives

1 2022

2 2017

3 Filipkowska U.

3 Jóźwiak T.

2 Kuczajowska-Zadrożna M.

2 Szymczyk P.

1 Filipkowska M.

1 Mielcarek A.

Effect of Ionic and Covalent Crosslinking of Hydrogel Chitosan Beads on the Adsorption Efficiency of Basic Violet 10 and Basic Green 4 Dyes From Aqueous Solutions

REMOVAL OF DYES FROM AQUEOUS SOLUTIONS BY GLAUCONITE IMMOBILISED ON CHITOSAN HYDROGEL BEADS

USE OF SAWDUST IMMOBILISED ON CHITOSAN FOR DISPOSAL OF DYES FROM WATER SOLUTIONS