Chlorine dioxide bleaching of nineteen non-wood plant pulps

Ferdous, Taslima; Quaiyyum, M. A.; Jahan, M. Sarwar

doi:10.1515/npprj-2020-0043

Cited by 11 publications

(4 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A bleaching process can remove lignin and other impurities. By removing those barriers, the cellulose becomes more accessible for carboxymethylation, leading to a higher yield of CMC during the subsequent processing steps [ 42 ]. The bleaching process can alter the properties of cellulose fibers by enhancing the reactive towards the carboxymethylation reaction.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Bleaching Processes on Physicochemical and Functional Properties of Cellulose and Carboxymethyl Cellulose from Young and Mature Coconut Coir

Klunklin,

Hinmo,

Thipchai

et al. 2023

Polymers

View full text Add to dashboard Cite

The objective of this study was to characterize the properties of cellulose and CMC synthesized from young and mature coconut coir with different bleaching times (bleaching for the first time; 1 BT, bleaching for a second time; 2 BT, and bleaching for the third time; 3 BT) using hydrogen peroxide (H2O2). The surface morphology, structural information, chemical compositions, and crystallinity of both cellulose and CMC were determined. H2O2 bleaching can support delignification by reducing hemicellulose and lignin, as evidenced by FTIR showing a sharp peak at wave number 1260 cm−1. The cellulose and CMC from coconut coir can be more dispersed and have greater functional characteristics with increasing bleaching times due to the change in accessibility of hydroxyl groups in the structure. The CMC diffraction patterns of coconut coir after the bleaching process showed the destruction of the crystalline region of the original cellulose. The SEM images showed that the surface of CMC was smoother than that of cellulose. The CMCy had a higher water holding capacity (WHC) compared to the CMCm as the bleaching can increase interaction between the polymer and water molecules. Therefore, the best quality of CMC corresponds to CMCy. Based on these findings, bleaching time has a strong effect on the functional properties of cellulose and CMC from coconut coir.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The highest decrease in kappa number occurred after chemical bleaching three times (3 BT). Ferdous, Quaiyyum, and Jahan [ 42 ] also reported that the kappa number of rice straw pulp was lower after delignification with chlorine dioxide. This could be related to the acid bleaching of the lignin as described by Ferdous et al [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Bleaching Processes on Physicochemical and Functional Properties of Cellulose and Carboxymethyl Cellulose from Young and Mature Coconut Coir

Klunklin,

Hinmo,

Thipchai

et al. 2023

Polymers

View full text Add to dashboard Cite

show abstract

“…During the last years, several promising approaches in all fields of established papermaking procedures have been investigated at a laboratory or pilot scale, to overcome the limitations and challenges of non-wood pulping. These methods have constituted nonwood plant fibers as a reasonable candidate to replace wood fibers, especially replacing hardwood as the pulp feedstock (El-Sayed et al 2020;Ferdous et al 2020;Sharma et al 2020a;Jahan et al 2021).…”

Section: Introductionmentioning

confidence: 99%

A comparative fiber morphological analysis of major agricultural residues (used or investigated) as feedstock in the pulp and paper industry

Tsalagkas

Börcsök

Pásztory

et al. 2021

BioRes

View full text Add to dashboard Cite

The suitabilities of major agricultural residues were assessed as papermaking feedstocks. All the examined agricultural residues were assumed as potential candidates for substituting hardwood fibers in mixed pulp blends from a fiber morphological perspective. Wheat, barley, rice, rapeseed, maize, sunflower, sugarcane bagasse, coconut husk, and two genotypes of miscanthus grass underwent identical maceration. The fiber length, fiber width, cell wall thickness, and lumen diameter were measured to calculate the slenderness ratio, flexibility coefficient, and Runkel ratio. The average fiber length ranged from 0.50 mm ± 0.32 mm (MG-S-02-V) to 1.15 mm mm ± 0.58 mm (sugarcane bagasse). The fiber width ranged from 10.77 μm ± 3.28 μm (rice straw) to 22.99 mm ± 5.20 mm (sunflower stalk). The lumen diameter ranged from 4.52 μm ± 2.52 μm (rice straw) to 13.23 μm ± 4.87 μm (sunflower stalk). The cell wall thickness ranged from 3.02 μm ± 0.95 μm (rice straw) to 4.80 μm ± 1.48 μm (sunflower stalk). The slenderness ratio, flexibility coefficient, and Runkel ratio values ranged between 28.08 to 58.11, 37.97 to 60.8, and 0.62 to 1.68, respectively. Wheat, maize, rapeseed, sugarcane bagasse, and coconut husk were found to be appropriate residue sources for papermaking feedstocks.

show abstract

“…The bleaching process is a necessary step to brighten pulp by treating it with chemicals composed of chlorine or oxygen, e.g., hypochlorite, chlorine, sodium hydroxide, chlorine dioxide, and hydrogen peroxide. The remaining lignin and other coloring matters such as tannin and gums are removed during this process [7]. Generally, the pulp is bleached in several stages and the bleaching sequence depends on chemical used, time, and temperature.…”

Section: Introductionmentioning

confidence: 99%

NH<sub>4</sub>OH- KOH Pulping and Single-Stage Bleaching Processes of Banana Pseudostem Waste: A Feasibility Study for Molded Pulp Packaging Use

Kunfong

Rattanawongkun

Tawichai

et al. 2021

MSF

View full text Add to dashboard Cite

The NH4OH-KOH pulping was a highly efficient process for extracting banana pseudostem waste (BNW) pulp. Besides, this greener pulping process allowed NH4OH recovery and KOH can be later used as fertilizer, reducing the environmental impact. It was found that the optimal BNW pulping condition was using 8.3 wt% NH4OH and 3.3 wt% KOH at a cooking temperature of 155°C for 1 h, and liquid to solid ratio 6:1. From the results, this process allowed low chemical usage and provided high pulp yield (44%) with a high delignification degree (80%) and low Kappa no. (22). After pulping, the single-stage bleaching of BNW pulp using 8 wt% H2O2 and 1.5 wt% NaOH at 90°C for 1 h was shown to improve the whiteness and brightness of the BNW molded pulp samples to 69.7% and 28.7%ISO (3-fold increase), respectively. As compared to commercial molded pulp food packaging, the present BNW molded pulp exhibited a superior tensile index of 54.3 Nm/g and Young’s modulus of 4.8 GPa.

show abstract

Chlorine dioxide bleaching of nineteen non-wood plant pulps

Cited by 11 publications

References 26 publications

Effect of Bleaching Processes on Physicochemical and Functional Properties of Cellulose and Carboxymethyl Cellulose from Young and Mature Coconut Coir

Effect of Bleaching Processes on Physicochemical and Functional Properties of Cellulose and Carboxymethyl Cellulose from Young and Mature Coconut Coir

A comparative fiber morphological analysis of major agricultural residues (used or investigated) as feedstock in the pulp and paper industry

NH<sub>4</sub>OH- KOH Pulping and Single-Stage Bleaching Processes of Banana Pseudostem Waste: A Feasibility Study for Molded Pulp Packaging Use

Contact Info

Product

Resources

About