scholarly journals Extraction of Cellulose Nanofibers via Eco-friendly Supercritical Carbon Dioxide Treatment Followed by Mild Acid Hydrolysis and the Fabrication of Cellulose Nanopapers

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1813 ◽  
Author(s):  
M. S. Nurul Atiqah ◽  
Deepu A. Gopakumar ◽  
Owolabi F. A. T. ◽  
Yasir Beeran Pottathara ◽  
Samsul Rizal ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Acid Hydrolysis ◽  
Plant Biomass ◽  
Cellulose Nanofibers ◽  
High Energy ◽  
Mild Acid Hydrolysis ◽  
Kenaf Fiber ◽  
Mild Acid ◽  
Supercritical Carbon

The conventional isolation of cellulose nanofibers (CNFs) process involves high energy input which leads to compromising the pulp fiber’s physical and chemical properties, in addition to the issue of elemental chlorine-based bleaching, which is associated with serious environmental issues. This study investigates the characteristic functional properties of CNFs extracted via total chlorine-free (TCF) bleached kenaf fiber followed by an eco-friendly supercritical carbon dioxide (SC-CO2) treatment process. The Fourier transmission infra-red FTIR spectra result gave remarkable effective delignification of the kenaf fiber as the treatment progressed. TEM images showed that the extracted CNFs have a diameter in the range of 10–15 nm and length of up to several micrometers, and thereby proved that the supercritical carbon dioxide pretreatment followed by mild acid hydrolysis is an efficient technique to extract CNFs from the plant biomass. XRD analysis revealed that crystallinity of the fiber was enhanced after each treatment and the obtained crystallinity index of the raw fiber, alkali treated fiber, bleached fiber, and cellulose nanofiber were 33.2%, 54.6%, 88.4%, and 92.8% respectively. SEM images showed that amorphous portions like hemicellulose and lignin were removed completely after the alkali and bleaching treatment, respectively. Moreover, we fabricated a series of cellulose nanopapers using the extracted CNFs suspension via a simple vacuum filtration technique. The fabricated cellulose nanopaper exhibited a good tensile strength of 75.7 MPa at 2.45% strain.

Influence of cellulose nanofibers on the morphology and physical properties of poly(lactic acid) foaming by supercritical carbon dioxide

2012 ◽  
Vol 21 (5) ◽  
pp. 529-533 ◽  
Author(s):  
Se Youn Cho ◽  
Hyun Ho Park ◽  
Young Soo Yun ◽  
Hyoung-Joon Jin
Keyword(s):  
Carbon Dioxide ◽  
Lactic Acid ◽  
Supercritical Carbon Dioxide ◽  
Physical Properties ◽  
Cellulose Nanofibers ◽  
Poly Lactic Acid ◽  
Supercritical Carbon

High energy ball milling and supercritical carbon dioxide impregnation as co-processing methods to improve dissolution of tadalafil

2016 ◽  
Vol 95 ◽  
pp. 130-137 ◽  
Author(s):  
Anna Krupa ◽  
Marc Descamps ◽  
Jean-François Willart ◽  
Renata Jachowicz ◽  
Florence Danède
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Processing Methods ◽  
Energy Ball ◽  
Supercritical Carbon

Response Surface Optimized Dyeing of Kenaf Fiber in Supercritical Carbon Dioxide

2014 ◽  
Vol 1048 ◽  
pp. 109-112 ◽  
Author(s):  
Jing Lu Guo ◽  
Shi Hui Gao ◽  
Chong Wen Yu ◽  
Lai Jiu Zheng ◽  
Bing Du
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Response Surface ◽  
Optimum Conditions ◽  
Kenaf Fiber ◽  
Temperature And Pressure ◽  
Kenaf Fibers ◽  
Central Composite ◽  
Carbon Dioxide Response ◽  
Supercritical Carbon

Kenaf fibers were dyed with capsanthin using supercritical carbon dioxide. Response surface methodology, based on a three level and three variable small central composite design, was employed to obtain the best possible combination of dyeing time, temperature and pressure for maximum K/S value.The optimum conditions were as follows: dyeing time of 60 min, temperature of 119.99 °C and pressure of 30 MPa. Under these conditions, the K/S value was 17.54, which was similar to the value predicted by the model.

scholarly journals Entangled cellulose nanofibers produced from sugarcane bagasse via alkaline treatment, mild acid hydrolysis assisted with ultrasonication

2021 ◽  
Author(s):  
Maimunah Asem ◽  
Dzun Noraini Jimat ◽  
Nur Huda Syazwani Jafri ◽  
Wan Mohd Fazli Wan Nawawi ◽  
Nor Fadhillah Mohamed Azmin ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Sugarcane Bagasse ◽  
Cellulose Nanofibers ◽  
Alkaline Treatment ◽  
Mild Acid Hydrolysis ◽  
Mild Acid

scholarly journals Utilization of supercritical carbon dioxide (SC-CO2) in lipids extraction from sewage sludge cake: A preliminary study

2021 ◽  
Vol 1195 (1) ◽  
pp. 012054
Author(s):  
N A Khalil ◽  
H A Hamid ◽  
A N S Fizal ◽  
M Zulkifli ◽  
M S Hossain ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Sewage Sludge ◽  
Supercritical Carbon Dioxide ◽  
Soxhlet Extraction ◽  
High Energy ◽  
Raw Material ◽  
Extraction Time ◽  
Solvent Ratio ◽  
Additional Time ◽  
Supercritical Carbon

Abstract Sewage sludge containing a large number of lipids that can be recovered and utilised as a promising raw material in the production of biodiesel. Studies have been conducted to extract lipids from sludge using conventional solvent methods. However, all these conventional methods have some limitations such as extensive product separation and long extraction time (between 4 to 8 hours), which lead to high energy consumption. Supercritical carbon dioxide extraction (SFE) which utilises carbon dioxide (CO2) gas at its critical condition as solvent has been studied extensively in various fields for oil extraction especially for plant and vegetative. This is due to the shorter extraction time and the lipids can be easily separated from the extraction system. The present research has undertaken a comparison study of supercritical carbon dioxide (SC-CO2) utilisation in the extraction of lipids from sewage sludge against conventional soxhlet extraction of methanol and ethanol as solvent. The extraction of lipids from sewage sludge utilising SC-CO2 extraction was successfully being conducted with lipids yield of 0.69 % within 0.5 hours at the operating temperature of 50 °C and pressure of 20 MPa. The lipids were easily separated subsequently from the SFE system when CO2 is being released in gas form through the outlet valve during lipids collection. Whilst soxhlet extraction using methanol and ethanol as solvent (sludge: solvent ratio of 1:10) managed to extract 1.95 % and 2.81 % within 4 hours of extraction time at 60 °C, with the additional time needed to separate the lipids from solvent by evaporation.

scholarly journals Extraction and Isolation of Cellulose Nanofibers from Carpet Wastes Using Supercritical Carbon Dioxide Approach

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 326
Author(s):  
Halimatuddahliana Nasution ◽  
Esam Bashir Yahya ◽  
H. P. S. Abdul Khalil ◽  
Marwan Abdulhakim Shaah ◽  
A. B. Suriani ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Fiber Length ◽  
Cellulose Nanofibers ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Composition Analysis ◽  
Band Frequency ◽  
Electron Microscopes ◽  
Supercritical Carbon

Cellulose nanofibers (CNFs) are the most advanced bio-nanomaterial utilized in various applications due to their unique physical and structural properties, renewability, biodegradability, and biocompatibility. It has been isolated from diverse sources including plants as well as textile wastes using different isolation techniques, such as acid hydrolysis, high-intensity ultrasonication, and steam explosion process. Here, we planned to extract and isolate CNFs from carpet wastes using a supercritical carbon dioxide (Sc.CO2) treatment approach. The mechanism of defibrillation and defragmentation caused by Sc.CO2 treatment was also explained. The morphological analysis of bleached fibers showed that Sc.CO2 treatment induced several longitudinal fractions along with each fiber due to the supercritical condition of temperature and pressure. Such conditions removed th fiber’s impurities and produced more fragile fibers compared to untreated samples. The particle size analysis and Transmission Electron Microscopes (TEM) confirm the effect of Sc.CO2 treatment. The average fiber length and diameter of Sc.CO2 treated CNFs were 53.72 and 7.14 nm, respectively. In comparison, untreated samples had longer fiber length and diameter (302.87 and 97.93 nm). The Sc.CO2-treated CNFs also had significantly higher thermal stability by more than 27% and zeta potential value of −38.9± 5.1 mV, compared to untreated CNFs (−33.1 ± 3.0 mV). The vibrational band frequency and chemical composition analysis data confirm the presence of cellulose function groups without any contamination with lignin and hemicellulose. The Sc.CO2 treatment method is a green approach for enhancing the isolation yield of CNFs from carpet wastes and produce better quality nanocellulose for advanced applications.

Furfural production by acid hydrolysis and supercritical carbon dioxide extraction from rice husk

2007 ◽  
Vol 24 (6) ◽  
pp. 936-941 ◽  
Author(s):  
Wirungrong Sangarunlert ◽  
Pornpote Piumsomboon ◽  
Somkiat Ngamprasertsith
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Acid Hydrolysis ◽  
Rice Husk ◽  
Supercritical Carbon Dioxide Extraction ◽  
Carbon Dioxide Extraction ◽  
Furfural Production ◽  
Supercritical Carbon
Sign in / Sign up

Export Citation Format

Share Document