Degradation of cellulose in NaOH and NaOH/urea aqueous solutions by ultrasonic irradiation

Kojima, Yoshihiro; Takayasu, Miyako; Toma, Maricela; Koda, Shinobu

doi:10.1016/j.ultsonch.2018.07.030

Cited by 23 publications

(10 citation statements)

References 24 publications

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“…The ratio of urea to NaOH to distilled water prepared is 7:12:81. The solution was pre-cooled at 268 K prior to dissolving the cellulose [18]. A calculated amount that corresponded to 2 % (w/v) of cellulose fiber was added to the solution and shaken vigorously by hand, since according to the literature this dissolution is regarded as the most optimum one, since with the increases of cellulose concentration in the hydrogel more -COOH groups become available for the absorption of cadmium ions.…”

Section: Dissolution Of Cellulosementioning

confidence: 99%

Superabsorbent Hydrogel from Extracted Oil Palm Frond Waste Cellulose Using Microwave Irradioation for Cadmium Ion Removal from Aqueous Solution

Selvakumaran¹,

Lazim²

2019

ChChT

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This research report facile approach on dispersion of cellulose fiber extracted from oil palm frond waste in a "green-solution" prepared by using urea and sodium hydroxide while the polymerization is carried out using microwave to form hydrogels. Effects of adding cellulose was determined by comparing the swelling degree between 0% and 2% cellulose hydrogel. Results showed that swelling ratio enhanced by the presence of cellulose. SEM images exposed that hydrogel with cellulose has rough surface compared to the hydrogels without cellulose. The XRD demonstrated that cellulose hydrogel lost its crystallinity upon polymerization. The DSC analysis showed that upon polymerization the hydrogel has better heat stability compared to the raw oil palm frond cellulose fiber. The FTIR shows successful polymerization has occurred between polyacrylamide and cellulose with a reference to band at 1657.99 cm-1 , which indicated the N-H bond. The capacity of cellulose hydrogel at different ratios to adsorb cadmium as a function of pH has also been carried out. Results showed that hydrogel made of 2% cellulose at pH 4 adsorbed the most cadmium. Therefore, this sorbent can potentially be used as Cd ion remover in aqueous solution.

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Section: Dissolution Of Cellulosementioning

confidence: 99%

Superabsorbent Hydrogel from Extracted Oil Palm Frond Waste Cellulose Using Microwave Irradioation for Cadmium Ion Removal from Aqueous Solution

Selvakumaran¹,

Lazim²

2019

ChChT

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“…However, pyrolysis involves high electricity consumption because it needs to be carried out at high temperatures of up to 900 °C. The third method is ultrasonication [ 38 ] which degrades the material by using ultrasonic waves at a frequency higher than 20 kHz combined with a liquid medium such as a solvent or polymer melt [ 5 ]. The last and most frequently utilized method is hydrothermal synthesis [ 39 , 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

The Production of Carbon Nanofiber on Rubber Fruit Shell-Derived Activated Carbon by Chemical Activation and Hydrothermal Process with Low Temperature

Suhdi

Wang

2021

Nanomaterials

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Recently, the conversion of biomass into carbon nanofibers has been extensively studied. In this study, carbon nanofibers (CNFs) were prepared from rubber fruit shell (RFS) by chemical activation with H3PO4, followed by a simple hydrothermal process at low temperature and without a vacuum and gas catalyst. XRD and Raman studies show that the structure formed is an amorphous graphite formation. From the thermal analysis, it is shown that CNFs have a high thermal stability. Furthermore, an SEM/TEM analysis showed that CNFs’ morphology varied in size and thickness. The obtained results reveal that by converting RFS into an amorphous carbon through chemical activation and hydrothermal processes, RFS is considered a potential biomass source material to produce carbon nanofibers.

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“…Therefore, pretreatments of corn stalks have a vital influence on utilization process, which can remove the lignin and hemicellulose and reduce the crystallinity of cellulose. Numerous pretreatments methods of corn stalk have been reported ， but few people pay attention to the crystallinity of crystalline cellulose (Behera et al, 2014;Rastogi et al, 2017;Hassan et al,2018;Huang et al,2018;Kojima et al,2019;Ponnusamy et al,2019;Xu et al,2019) The study compared of four pretreatments methods that is oven drying, steaming, complex enzymolysis and fermentation by Candida utilis and Pachysolen tannophilus, evaluating the crystallinity of crystalline cellulose after treated with the aid of X-ray diffraction, scanning electron microscopy and infrared spectroscopy. At the same time, the corn stalks's utilization rate of reducing sugar and the output of protein feed have been increased (Chen and Zhang, 2008;Luo et al, 2009;Chen et al, 2009;Yang et al, 2015;Wu et al, 2016;Chen et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Crystalline Cellulose of Corn Straw through Different Pretreatments Via X-Ray Diffraction, Scanning Electron Microscopy and Infrared Spectroscopy

Chen

Yin

Shangguan

et al. 2021

Acta Universitatis Cibiniensis. Series E: Food Technology

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Waste recycling is beneficial not only for the environment but also for the economy and the society at large. Corn stalks, the most abundant crop waste, are processed with oven drying, steaming, complex enzymatic hydrolysis (cellulase, xylanase, β-glucanase and pectinase), and fermentation (by Candida utilis and Pachysolen tannophilus), were analyzed via X-ray diffraction, Scanning Electron Microscopy (SEM) and Infrared Spectroscopy (IR). The results indicated that thermophilic digestion destroyed glycosidic bonds and fibrous crystal have a significant effect on the degradation of the corn stalks, while complex enzyme hydrolysis only slightly degraded fibrous crystal. Fermentation did not significantly reduce fibrous crystal. Therefore, our research suggested that thermophilic digestion is the appropriate way to increase the saccharification rate and feed yield of corn stalks.

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Degradation of cellulose in NaOH and NaOH/urea aqueous solutions by ultrasonic irradiation

Cited by 23 publications

References 24 publications

Superabsorbent Hydrogel from Extracted Oil Palm Frond Waste Cellulose Using Microwave Irradioation for Cadmium Ion Removal from Aqueous Solution

Superabsorbent Hydrogel from Extracted Oil Palm Frond Waste Cellulose Using Microwave Irradioation for Cadmium Ion Removal from Aqueous Solution

The Production of Carbon Nanofiber on Rubber Fruit Shell-Derived Activated Carbon by Chemical Activation and Hydrothermal Process with Low Temperature

Evaluation of Crystalline Cellulose of Corn Straw through Different Pretreatments Via X-Ray Diffraction, Scanning Electron Microscopy and Infrared Spectroscopy

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