Cationization of <i>Eucalyptus</i> wood waste pulps with diverse lignin contents for potential application in colored wastewater treatment

Grenda, Kinga; Gamelas, José A. F.; Arnold, Julien; Cayre, Olivier J.; Rasteiro, Maria G.

doi:10.1039/c9ra05757a

Cited by 14 publications

(25 citation statements)

References 28 publications

(42 reference statements)

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“…The obtained cationic and anionic cellulose-based PELs were characterized by FTIR spectroscopy to confirm the presence of the new functional groups introduced in the polysaccharide's backbone (Grenda et al, 2019) and by elemental analysis in order to determine the cationicity or anionicity index of the products. The nitrogen content assessed by elemental analysis was used to obtain the degree of cationization while the sulfur content was used to determine the degree of anionization of cellulose in the ADAC samples.…”

Section: Characterization Of Water-soluble Cationic and Anionic Cellumentioning

confidence: 99%

“…Similarly, zeta potential values were taken as an average of 5 repeated measurements. Details of the sample's preparations can be found elsewhere (Grenda et al, 2019).…”

Section: Characterization Of Water-soluble Cationic and Anionic Cellumentioning

confidence: 99%

“…The high biodegradability, and low or non-toxicity, as well as wide availability make cellulose-based PELs a more environmentally friendly option. Moreover, valorization of cellulosic wastes itself to provide end products with higher added value is also an important aspect (Grenda et al, 2019). Due to the low water solubility of cellulose it is essential to introduce charged groups, either cationic or anionic, in the cellulose backbone, and modification possibilities are limited.…”

Section: Introductionmentioning

confidence: 99%

“…This treatment allows the end material to be highly charged (high degree of substitution) making it easy to solubilize in water at room temperature. Sirviö et al (2011b) and Liimatainen et al (2011) reported the modification of bleached pulp from birch wood, using the aforementioned procedure, and Grenda et al (2019Grenda et al ( , 2020 reported the modification of bleached and unbleached Eucalyptus globulus pulp using the same strategy.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Anionic and Cationic Pulp-Based Flocculants With Diverse Lignin Contents for Application in Effluent Treatment From the Textile Industry: Flocculation Monitoring

Grenda

Gamelas

Arnold³

et al. 2020

Front. Chem.

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In wastewater treatment, flocculation is a widely used solid/liquid separation technique, which typically employs a charged polymer, a polyelectrolyte (PEL). Polyelectrolytes features, such as charge type, charge density and molecular weight, are essential parameters affecting the mechanism of flocculation and subsequent floc sedimentation. The effectiveness of the process is also influenced by the characteristics of the system (e.g., type, size, and available surface area of suspended particles, pH of the medium, charge of suspended particles). Thus, a good understanding of the flocculation kinetics, involved mechanisms and flocs structure is essential in identifying the most adequate treatment conditions, having also into consideration possible subsequent treatments. In this study, Eucalyptus bleached pulp and a cellulosic pulp with high lignin content (∼4.5 wt%) obtained from Eucalyptus wood waste were used for bio-PELs production. Firstly, a pre-treatment with sodium periodate increased the pulps reactivity. To produce cationic cellulose the oxidation step was followed by the introduction of cationic groups in the cellulose chains, through reaction with Girard's reagent T. Applying different molar ratios (0.975 and 3.9) of Girard's reagent T to aldehyde groups led to cationic PELs with diverse charge density. On the other hand, to obtain anionic cellulose a sulfonation reaction with sodium metabisulfite was applied to the intermediate dialdehyde cellulose-based products, during 24 or 72 h, and anionic-PELs with diverse features were obtained. The developed water soluble, anionic and cationic bio-PELs were characterized and tested as flocculation agents for a textile industry effluent treatment. Initially, jar-tests were used to tune the most effective flocculation procedure (pH, flocculant dosage, etc.). Flocculation using these conditions was then monitored continuously, over time, using laser diffraction spectroscopy (LDS). Due to the small size of the dyes molecules, a dual system with an inorganic complexation agent (bentonite) was essential for effective decolouration of the effluent. Performance in the treatment was monitored first by turbidity removal evaluation (75-88% with cationic-PELs, 75-81% with anionic-PELs) and COD reduction evaluation (79-81% with cationic-PELs, 63-77% with anionic-PELs) Grenda et al.Evaluation of Anionic and Cationic Pulp-Based Flocculants in the jar tests. Additionally, the evolution of flocs characteristics (structure and size) during their growth and the flocculation kinetics, were studied using the LDS technique, applying the different PELs produced and for a range of PEL concentration. The results obtained through this monitoring procedure allowed to discuss the possible flocculation mechanisms involved in the process. The results obtained with the bio-PELs were compared with those obtained using synthetic PELs, commonly applied in effluents treatment, polyacrylamides. The developed bio-PELs can be competitive, eco-friendly flocculation agents for effluents treatment fro...

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Section: Characterization Of Water-soluble Cationic and Anionic Cellumentioning

confidence: 99%

“…Similarly, zeta potential values were taken as an average of 5 repeated measurements. Details of the sample's preparations can be found elsewhere (Grenda et al, 2019).…”

Section: Characterization Of Water-soluble Cationic and Anionic Cellumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Anionic and Cationic Pulp-Based Flocculants With Diverse Lignin Contents for Application in Effluent Treatment From the Textile Industry: Flocculation Monitoring

Grenda

Gamelas

Arnold³

et al. 2020

Front. Chem.

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“…In cellulose, the reaction occurs on the hydroxyl groups of the beta-glucan units (Figure 11), thus allowing the potential grafting of new functional groups and extending the range of practical applications [74]. A different modification method was recently suggested by Grenda et al (2019) to introduce cationic charges along the cellulose chain [75][76][77]. The authors used a two-step reaction to produce cationic cellulose, based on a periodate oxidation followed by the reaction between the Girard's reagent and the aldehyde groups of the oxidised cellulose [77] (Figure 12).…”

Section: Bio-based Solutions For Microplastics Removal: Current Trendmentioning

confidence: 99%

Microplastics in Ecosystems: From Current Trends to Bio-Based Removal Strategies

et al. 2020

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Plastics are widely used due to their excellent properties, inexpensiveness and versatility leading to an exponential consumption growth during the last decades. However, most plastic does not biodegrade in any meaningful sense; it can exist for hundreds of years. Only a small percentage of plastic waste is recycled, the rest being dumped in landfills, incinerated or simply not collected. Waste-water treatment plants can only minimize the problem by trapping plastic particles of larger size and some smaller ones remain within oxidation ponds or sewage sludge, but a large amount of microplastics still contaminate water streams and marine systems. Thus, it is clear that in order to tackle this potential ecological disaster, new strategies are necessary. This review aims at briefly introducing the microplastics threat and critically discusses emerging technologies, which are capable to efficiently clean aqueous media. Special focus is given to novel greener approaches based on lignocellulose flocculants and other biomaterials. In the final part of the present review, it was given a proof of concept, using a bioflocculant to remove micronized plastic from aqueous medium. The obtained results demonstrate the huge potential of these biopolymers to clean waters from the microplastics threat, using flocculants with appropriate structure.

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Cationic dialdehyde cellulose microfibers for efficient removal of eriochrome black T from aqueous solution

Gomes

Leal

Tolosa

et al. 2023

Bioresource Technology

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Cationization of Eucalyptus wood waste pulps with diverse lignin contents for potential application in colored wastewater treatment

Abstract: Eucalyptus wood waste has been used to produce cationic lignocellulose-based polyelectrolytes (PELs) and the new PELs proved to be efficient flocculants in the decoloration of dye-containing waters with potential application in several industries.

Cited by 14 publications

References 28 publications

Evaluation of Anionic and Cationic Pulp-Based Flocculants With Diverse Lignin Contents for Application in Effluent Treatment From the Textile Industry: Flocculation Monitoring

Evaluation of Anionic and Cationic Pulp-Based Flocculants With Diverse Lignin Contents for Application in Effluent Treatment From the Textile Industry: Flocculation Monitoring

Microplastics in Ecosystems: From Current Trends to Bio-Based Removal Strategies

Cationic dialdehyde cellulose microfibers for efficient removal of eriochrome black T from aqueous solution

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