Pectin microgel particles as high adsorption rate material for methylene blue: Performance, equilibrium, kinetic, mechanism and regeneration studies

Yu, Lili; Jiang, Lina; Wang, Shuya; Sun, Manman; Li, Deqiang; Du, Guangming

doi:10.1016/j.ijbiomac.2018.01.193

Cited by 38 publications

(14 citation statements)

References 38 publications

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“…The values of Q m (mmol/g) listed in Table 1 reveal that pectin has the greatest MB uptake capacity, which concurs with its abundant -OH and -COOH active sites. As well, pectin is very soluble in water with highly accessible carboxylate groups since pH > pK a , which is in contrast to heterogeneous adsorbents that are water-insoluble with lesser surface accessibility [35]. The formation of pectin-chitosan composites with covalent amide bonding show promising dye uptake performance such as PC51 S DMSO, since such CBF-based systems are more amenable to phase separation and recovery after the dye adsorption process.…”

Section: Sorption Isotherm Resultsmentioning

confidence: 99%

Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites

Kong

Wilson

2020

J. Compos. Sci.

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To address the need to develop improved hybrid biopolymer composites, we report on the preparation of composites that contain chitosan and pectin biopolymers with tunable adsorption properties. Binary biopolymer composites were prepared at variable pectin–chitosan composition in a solvent directed synthesis, dimethyl sulfoxide (DMSO) versus water. The materials were characterized using complementary methods (infrared spectroscopy, thermal gravimetric analysis, pH at the point-of-zero charge, and dye-based adsorption isotherms). Pectin and chitosan composites prepared in DMSO yielded a covalent biopolymer framework (CBF), whereas a polyelectrolyte complex (PEC) was formed in water. The materials characterization provided support that cross-linking occurs between amine groups of chitosan and the –COOH groups of pectin. CBF-based composites had a greater uptake of methylene blue (MB) dye over the PEC-based composites. Composites prepared in DMSO were inferred to have secondary adsorption sites for enhanced MB uptake, as evidenced by a monolayer uptake capacity that exceeded the pectin–chitosan PECs by 1.5-fold. This work provides insight on the role of solvent-dependent cross-linking of pectin and chitosan biopolymers. Sonication-assisted reactions in DMSO favor CBFs, while cross-linking in water yields PECs. Herein, composites with tunable structures and variable physicochemical properties are demonstrated by their unique dye adsorption properties in aqueous media.

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Section: Sorption Isotherm Resultsmentioning

confidence: 99%

Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites

Kong

Wilson

2020

J. Compos. Sci.

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“…The Q m values of MB were generally high on calcium alginate membrane [64], activated carbon [65], calcium alginate beads [65], graphene oxide-sodium alginate composite [66], reduced graphene oxide-TiO 2 NPs composites [67], microwave modified nano-silica beads [68], and agar-graphene oxide composites [63]. The Q m values of MB on PAT composites in this study were lower than those adsorbents, but they were at least comparable with those on nano-silica beads [68] and were superior compared to most reported biopolymers and their composites (such as pectin gel microsphere [69], cellulose composite [73], chitosan-sepiolite composite [77], magnetite-pectin composite [71], and magnetite-silica-pectin composite [71]), clays-based materials (clay-biochar [77], zeolite [78], red kaolin [70], kaolin [78], chitosan modified zeolite [77]), and agro-wastes (modified rice husk [68] and date palm leaves [76]). (0) 435 This work PAT (0.005) 571 This work PAT (0.05) 637 This work PAT (0.25) 601 This work…”

Section: The Effect Of Tio 2 Nps Loading Contentmentioning

confidence: 60%

Insight into the adsorption kinetics, mechanism, and thermodynamics of methylene blue from aqueous solution onto pectin-alginate-titania composite microparticles

et al. 2021

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In the present study, pectin-alginate-titania (PAT) composites were synthesized and the adsorptive removal behavior of methylene blue (MB) from aqueous solution, as a model of synthetic organic effluents, onto the prepared PAT composites were investigated by monitoring the effect of contact time, initial MB concentration, and temperature. The adsorption isotherm data were fitted well with the Freundlich isotherm model, suggesting the surface heterogeneity of the PAT composites and that the MB adsorption occurred on the active sites on multilayer surface of the composites. The adsorption kinetics of MB was demonstrated to be pseudo-second order, governed by two intraparticle diffusion rates, and the adsorption process was exothermic, spontaneous, and more disorder. The Langmuir isotherm model suggested that the maximum adsorption capacity of MB on the PAT composites was in the range of 435–637 mg g–1. In general, it increased with the TiO2 NPs content in the PAT composites, due most likely to the increase in surface area exposing more functional groups of the pectin and alginate to interact with the synthetic dye. The adsorptive removal of MB by the PAT composites was found to be more efficient compared with many other reported adsorbents, such as graphene oxide hybrids, pectin microspheres, magnetite-silica-pectin composites, clay-based materials, chemically treated minerals, and agricultural waste. The present study therefore demonstrated for the first time that PAT composites are not only promising to be utilized as an adsorbent in wastewater treatment, but also provide an insight into the adsorption mechanism of the synthetic dyes onto the biopolymers-titania composites. Graphic abstract Insight into the adsorption kinetics, mechanism, and thermodynamics of methylene blue from aqueous solution onto pectin-alginate-titania composite microparticles.

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“…The effect of the initial concentration of MB and temperature on adsorption performances is shown in Figure a. The Q e of the microgels increased from 489.0 to 2708.0 mg/g as the initial concentration of MB varied from 100 to 700 mg/L at 30 °C . When the initial concentration of MB was lower than 400 mg/L, the Q e increased linearly with the increase in the concentration.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption isotherms were used to study the adsorption mechanism and surface properties of CMC/PAA microgels . The Langmuir and the Freundlich adsorption isotherm models are shown in eqs and , respectively. , where Q max and Q e (mg/L) are the maximum value and the equilibrium value of adsorption capacity; C e (mg/L) is the initial concentration of MB at adsorption equilibrium time; K L and K F (L·mg –1 ) are the Langmuir adsorption constant and the Freundlich adsorption constant, respectively; and n is the adsorption intensity of the adsorbent.…”

Section: Resultsmentioning

confidence: 99%

“…Many adsorbent materials have been used to remove dyes in wastewater, including activated carbon, clay, metal oxides, synthetic polymers, natural polymers, and their composites. − Considering the economic and technological requirements, polysaccharides are widely investigated and applied as excellent materials for the development of adsorbents, which are attributed to their environmentally friendly, renewable, and abundant reserves, , such as cellulose, chitosan, pectin, etc. − Bai et al synthesized a porous cellulose/activated carbon monolith by thermally induced phase separation to remove MB and rhodamine B, which exhibited good adsorption performance. The maximum adsorption capacity reached 159 and 33.4 mg/g at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Sodium Carboxymethyl Cellulose/Poly(acrylic acid) Microgels via Visible-Light-Triggered Polymerization as a Self-Sedimentary Cationic Basic Dye Adsorbent

Feng

Dong

et al. 2022

Langmuir

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In this study, sodium carboxymethyl cellulose/poly(acrylic acid) (CMC/PAA) microgels were successfully synthesized via visible-light-triggered free-radical polymerization to remove methylene blue (MB) from water. The microgels had a loose and porous 3-D network structure, exhibiting excellent adsorption performance. The equilibrium adsorption capacity and the removal efficiency of the microgels reached approximately 1479 mg/g and 97%, respectively, when the initial concentration of MB was 300 mg/L. The adsorption kinetics was well described by the pseudo-second-order model, and the adsorption isotherms followed the Langmuir isothermal model. Notably, CMC/PAA microgels could naturally settle and be separated from the MB solution. Furthermore, the recovery efficiency of the regenerated CMC/PAA microgels reached approximately 94% after five adsorption–desorption cycles. Therefore, the microgels could be used as promising adsorbents due to the advantages of high adsorption capacity, fast removal rate, and reusability.

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Pectin microgel particles as high adsorption rate material for methylene blue: Performance, equilibrium, kinetic, mechanism and regeneration studies

Cited by 38 publications

References 38 publications

Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites

Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites

Insight into the adsorption kinetics, mechanism, and thermodynamics of methylene blue from aqueous solution onto pectin-alginate-titania composite microparticles

Synthesis of Sodium Carboxymethyl Cellulose/Poly(acrylic acid) Microgels via Visible-Light-Triggered Polymerization as a Self-Sedimentary Cationic Basic Dye Adsorbent

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