Use of aminated hulls of sunflower seeds for the removal of anionic dyes from aqueous solutions

Jóźwiak, Tomasz; Filipkowska, Urszula; Brym, Szczepan; Kopec, Lukasz

doi:10.1007/s13762-019-02536-8

Cited by 30 publications

(16 citation statements)

References 38 publications

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“…The positive effect of low pH on the sorption of anionic dyes has also been observed in studies addressing the decolorization of aqueous solutions on other biomass-based unconventional sorbents, such as: the husk of sunflower seeds [ 34 ], pumpkin [ 35 ], cotton [ 36 ], and also activated carbons based on palm shells [ 37 ] or bamboo [ 38 ].…”

Section: Resultsmentioning

confidence: 81%

Aminated Rapeseed Husks (Brassica napus) as an Effective Sorbent for Removing Anionic Dyes from Aqueous Solutions

Jóźwiak,

Filipkowska

2024

Molecules

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The study investigated the effect of modifying rapeseed husks with ammonia and epichlorohydrin on their sorption capacity against anionic reactive dyes: Reactive Black 5 (RB5) and Reactive Yellow 84 (RY84). Its scope included sorbents characterization (FTIR, pHPZC), determination of pH influence on the sorption effectiveness of dyes, the adsorption kinetics of dyes, as well as the maximum sorption capacity. The study proved that the reaction of rapeseed husk biomass with ammonia can lead to its amination, namely to the introduction of amine functional groups into the material’s structure. The sorption effectiveness of RB5 and RY84 on the tested sorbents was the highest in the pH range of 2–3. The dye sorption kinetics was well described by the pseudo-second-order model. The sorption equilibrium time ranged from 90 to 180 min, and depended on the initial concentration of dyes and the number of amino groups on the sorbent’s surface. The most efficient of the sorbents tested were rapeseed husks pre-activated with epichlorohydrin and then aminated with ammonia. Their sorption capacity determined for RB5 and RY84 was 135.83 mg/g and 114.23 mg/g, respectively, which was 794% and 737% higher than that of the non-modified husks.

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Section: Resultsmentioning

confidence: 81%

Aminated Rapeseed Husks (Brassica napus) as an Effective Sorbent for Removing Anionic Dyes from Aqueous Solutions

Jóźwiak,

Filipkowska

2024

Molecules

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“…At high pH value, the functional groups of sorbents (-OH, -NH 2 ) can be deprotonated, as a result of which the sorbent gains a negative charge (Lindman et al 2017;Pan et al 2019) and this inhibits the binding process of anionic dyes. At high pH, very low sorption efficiency of anionic dyes on CFs and ACFs may also result from competition of dyes with OHions (Jóźwiak et al 2020).…”

Section: Influence Of Solution Ph On Dye Sorption Efficiencymentioning

confidence: 99%

The use of aminated cotton fibers as an unconventional sorbent to remove anionic dyes from aqueous solutions

et al. 2020

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This study aimed to investigate the sorption of anionic dyes (Reactive Black 5, Reactive Yellow 84, Acid Red 18, and Acid Yellow 23) by cotton fibers aminated with epichlorohydrin and ammonia water (ACFs) as well by unmodified cotton fibers (CFs). CFs and ACFs were characterized based on FTIR, elemental analysis (C/N content) and pH PZC . The effect of solution pH (pH 2-11) and contact time on the removal of dye was studied as well. The kinetic experimental data were fitted to pseudo-first order, pseudo-second order, and intraparticle diffusion model. Equilibrium isotherms were analyzed based on Langmuir and Freundlich isotherms. The efficiency of dye sorption on CFs was the most effective at pH 2, whereas on ACFs-at pH 3-4. ACFs and CFs changed the pH value of the sorption solution. The system tended to obtain a pH value close to the pH PZC value of the sorbent (pH PZC = 7.85 for CFs/pH PZC = 8.15 for ACFs). ACFs had a shorter dye sorption equilibrium time compared to the CFs. The sorption of dyes on cotton sorbents proceeded in 2 main phases. The best match to the experimental data was shown by the pseudo-secondary model. Having amine functional groups, the ACFs ensured far better sorption of anionic dyes than CFs did. The maximum Reactive Black 5 sorption capacity of ACFs was Q max = 36.77 mg/g, which was 1240% higher than that of CFs (Q max-= 2.74 mg/g).

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“…The positive effect of low pH on anionic dye sorption efficiency has been corroborated by studies on RB5 sorption onto purified chitin [27], feathers [28], and activated carbon [29], as well as RY84 sorption onto cotton fiber [30] and sunflower hulls [31].…”

Section: Influence Of Ph On the Dye Sorption Efficiency On Mes And Mmsmentioning

confidence: 79%

The Use of Exoskeletons and Molts of Farmed Mealworm (Tenebrio molitor) for the Removal of Reactive Dyes from Aqueous Solutions

2023

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The study aim was to test the applicability of exoskeletons and molts from mealworm (Tenebrio molitor) cultures as sorbents for anionic dyes: Reactive Black 5 (RB5) and Reactive Yellow (RY84). Factors investigated included: characteristics of sorbents (FTIR, pHPZC), the influence of pH on sorption efficiency, sorption kinetics (pseudo-first, pseudo-second-order, intraparticle diffusion models), and determination of the maximum sorption capacity (Langmuir 1, Langmuir 2, Freundlich, and Dubinin–Radushkevich models). The sorption efficiency of anionic dyes on the tested sorbents was the highest at pH 2. The time needed to reach the sorption equilibrium for both dyes was 120–150 min. The sorption kinetics of the dyes were best described by the pseudo-second-order model. Maximum sorption capacity data showed the best fit to Langmuir 2 isotherm, suggesting that at least two types of sorption centers played an important role in dye sorption. Presumably, for both of the tested sorbents, the active sites in question were protonated amine (-NH3+), acetamide (NH2COCH3+), and hydroxyl groups (-OH2+) of chitin and protein. The maximum RB5 and RY84 sorption capacity of the tested sorbents was 78.70 mg/g and 60.49 mg/g, respectively, for mealworm exoskeletons, as well as 55.72 mg/g and 44.25 mg/g, respectively, for mealworm molts.

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Use of aminated hulls of sunflower seeds for the removal of anionic dyes from aqueous solutions

Cited by 30 publications

References 38 publications

Aminated Rapeseed Husks (Brassica napus) as an Effective Sorbent for Removing Anionic Dyes from Aqueous Solutions

Aminated Rapeseed Husks (Brassica napus) as an Effective Sorbent for Removing Anionic Dyes from Aqueous Solutions

The use of aminated cotton fibers as an unconventional sorbent to remove anionic dyes from aqueous solutions

The Use of Exoskeletons and Molts of Farmed Mealworm (Tenebrio molitor) for the Removal of Reactive Dyes from Aqueous Solutions

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