Thermal analysis of the prepared lignin/graphene oxide/polyurethane composite

El‐Shafie, M.; Taha, Mohamed; El-Hamamsy, S.; Moustafa, Yasser; El-Azab, Waleed I. M.

doi:10.1016/j.ejpe.2020.04.001

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…In good agreement with the former GO-related TGA studies, it showed similar results upon increasing temperature. The first weight variation at 100 °C is ascribed to the removal of the moisture, 51–55 the second drop from 150 °C to 220 °C is attributed to the removal of oxygen functional groups, 51–56 and the last region above 550 °C is assigned to the removal of stable oxygen groups or combustion of remaining materials. 52–56…”

Section: Resultsmentioning

confidence: 99%

Study on graphene oxide as a hole extraction layer for stable organic solar cells

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Study on graphene oxide as a hole extraction layer for stable organic solar cells

et al. 2021

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“…Table 1 shows the characteristic bands of the infrared spectra of the obtained lignins. According to the NMR results shown in Figure 6, the lignin spectra show the appearance of signals in the region of 6.7 ppm, which characterize the presence of aromatic protons in the structures of syringylpropane and guaiacylpropane fragments of lignin [34]. The intensity of the proton signals in the region of 6.7-6.8 ppm indicates a higher content of syringyl (S) links compared to guaiacyl (G) in the studied lignin [35].…”

Section: Physical and Chemical Characteristics Of Lignins Obtained Fr...mentioning

confidence: 92%

Synthesis of Lignin/PAN Fibers from Sawdust

Nazhipkyzy,

Maltay,

Lesbayev

et al. 2024

Fibers

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Carbon nanofibers based on lignin from wood waste have a promising potential for the ability to produce electrodes that can modernize existing energy storage technology. The most important detail is that the low cost, as well as the availability of the initial products for the production of lignin, will reduce the cost of energy storage devices and contribute to improving the environment. In this study, pine sawdust and elm sawdust were used as raw materials for the production of lignin, which accumulate in large quantities in metal workshops in Almaty. Lignin extraction was carried out using an organosolvent method, which is environmentally friendly, low-cost, uses minimal amounts of strong acids and metal catalysts, does not pollute water, and does not emit sulfur dioxide (SO2). A comprehensive study of the characteristics of the obtained lignins from wood waste was carried out. Infrared spectroscopy (IR) revealed that the obtained lignin contains aromatic, phenolic, hydroxyl, methyl, and methoxyl groups. The results of nuclear magnetic resonance (NMR) spectroscopy showed the presence of a high number of syringyl (S) links compared to guaiacyl (G), which contribute to increased efficiency in the thermal processing of lignin. Also, this study investigated the use of the obtained lignins to produce continuous fibers by electrospinning. The effect of lignin mass on the viscosity of the lignin/polyacrylonitrile (PAN) solution and the effect of the carbonization temperature on the physico-chemical characteristics of the lignin/PAN solution were investigated. The following research methods were used for this purpose: Raman spectroscopy, thermogravimetric analysis (TGA), electron scanning microscopy, energy dispersion analysis, IR, NMR, and optical microscopy. The conditions for the production of lignin-containing carbon fibers at temperatures of 800, 900, and the carbonation heating rate, is an important parameter in the production of carbon fibers as it strongly affects the characteristics of the resulting carbon fibers. The heating rate affects were studied, and it was found that, at a heating rate of 5 °C/min and a carbonation temperature of 800 °C, porous carbon nanofibers with a diameter of 47 nm are formed in a nitrogen medium for 60 min.

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“…41 Além de ser um método promissor quando se considera a recuperação de grande parte do licor branco utilizados na polpação, aproximadamente 90 %, apresenta um controle maior sob a precipitação da lignina extraída, devido ao processo ocorrer em meio aquoso, enquanto em outros processos sua precipitação é feita através da acidificação do meio. 31 Se comparado com o processo Kraft, este último também recupera uma grande parte dos insumos iniciais. Porém os gastos energéticos envolvidos nas caldeiras de recuperação superam e muito os gastos para recuperação do licor branco acetossolve.…”

Section: Rendimento Da Extração Da Ligninaunclassified

Isolation and Characterization of Acetosolv Lignin Present in Sugarcane Bagasse

Rodrigues¹,

Carmo²,

Freitas³

et al. 2020

Rev. Virtual Quim.

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The lignin present in the vegetal tissues of the sugarcane bagasse is an interesting material due to its aromatic characteristics. Particularly in Brazil, studies involving the extraction of lignin from sugarcane bagasse have been widely researched due to the high volume of bagasse generated in our country. Recent studies have shown that after isolation, lignin is a raw material that can be used as a pesticide, solution stabilizer and particularly for the production of phenolic resin partially replacing phenol. The present study aimed to isolate and characterize the lignin present in sugarcane bagasse by the acetosolv pulping method. The sugarcane bagasse was pre-treated to remove organic and hot water-soluble extracts, and then acetic (solvent) and hydrochloric (catalyst) acids and water at the temperature were used. boiling point for the isolation of lignin by the acetossolve process. The obtained lignin was characterized by chemical performance analysis, Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC) and thermogravimetry (TGA). The extraction yield of lignin acetosolv was 19.95 % under total sugarcane bagasse. In the lignin FTIR spectrum the stretch range between 1594 and 1511 cm-1 confirm the preservation of the aromatic structure. GPC analysis demonstrated a low polydispersity of lignin acetosolv. TGA analysis showed no residues above 600°C, indicating high content of organic material, confirming the purity of the extracted sample. It is concluded, therefore, that the acetossolve pulping method for lignin extraction may be an efficient alternative, in view of the processes traditionally employed if fibers, not wood (sugarcane bagasse) are used. The fact that it is a process that does not use pressure combined with the possibility of recovering inputs by simple evaporation, makes the acetosolv competitive and with less environmental damage than other traditional processes. A lignina presente nos tecidos vegetais do bagaço da cana é um material interessante devido às suas características aromáticas. Particularmente no Brasil, estudos envolvendo a extração de lignina do bagaço de cana têm sido amplamente pesquisados devido ao alto volume de bagaço gerado em nosso país. Estudos recentes demonstraram que, após o isolamento, a lignina é uma matéria-prima que pode ser usada como pesticida, estabilizador de solução e particularmente para a produção de resina fenólica, substituindo parcialmente o fenol. O presente estudo teve como objetivo isolar e caracterizar a lignina presente no bagaço de cana-de-açúcar pelo método de polpação acetossolve. O bagaço de cana-de-açúcar foi submetido a um pré-tratamento para a remoção de extrativos orgânicos e extrativos solúveis em água quente, e posteriormente, utilizaram-se os ácidos acético (solvente) e clorídrico (catalisador), e água na temperatura de ebulição, para o isolamento da lignina, pelo processo acetossolve. A lignina obtida foi caracterizada por análise química de rendimento, espectroscopia na região do infravermelho com transforma...

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Thermal analysis of the prepared lignin/graphene oxide/polyurethane composite

Cited by 5 publications

References 16 publications

Study on graphene oxide as a hole extraction layer for stable organic solar cells

Study on graphene oxide as a hole extraction layer for stable organic solar cells

Synthesis of Lignin/PAN Fibers from Sawdust

Isolation and Characterization of Acetosolv Lignin Present in Sugarcane Bagasse

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