Pub Date : 2022-06-13DOI: 10.1080/02773813.2022.2085746
Nazife Isik Haykir, Bensu Unal, Nazligul Simsek, Şamil Ercan Özcan
Abstract In this article, protic ionic liquids (PILs) and deep eutectic solvent (DESs) were explored to enrich the cellulose content of a paper mill sludge (PMS) received from a sanitary paper manufacturing plant. Compositional, morphological, physico-chemical, and thermal decomposition features of PMS were monitored using XRF, SEM, FTIR, XRD, and TGA. Triethylammonium hydrogen sulfate (TEAHSO4), which functioned selectively for the elimination of mineralogical content and cellulose enrichment of PMS, enhanced the cellulose content of the material from 45% to 74% following the pretreatment at 150 °C. Though DESs such as choline chloride-urea behaved poorly toward demineralization relative to PILs, they preserved cellulose effectively in the structure and gave satisfactory saccharification yields that reached over 90%. In addition to integrating the sustainable benefits of PILs and DESs into the valorization of PMS for the first time in literature, this work highlighted the competency of PMS as a cellulose-rich feedstock for biorefinery applications.
{"title":"Valorization of paper mill sludge using protic ionic liquids and deep eutectic solvents as a potential feedstock for biorefineries","authors":"Nazife Isik Haykir, Bensu Unal, Nazligul Simsek, Şamil Ercan Özcan","doi":"10.1080/02773813.2022.2085746","DOIUrl":"https://doi.org/10.1080/02773813.2022.2085746","url":null,"abstract":"Abstract In this article, protic ionic liquids (PILs) and deep eutectic solvent (DESs) were explored to enrich the cellulose content of a paper mill sludge (PMS) received from a sanitary paper manufacturing plant. Compositional, morphological, physico-chemical, and thermal decomposition features of PMS were monitored using XRF, SEM, FTIR, XRD, and TGA. Triethylammonium hydrogen sulfate (TEAHSO4), which functioned selectively for the elimination of mineralogical content and cellulose enrichment of PMS, enhanced the cellulose content of the material from 45% to 74% following the pretreatment at 150 °C. Though DESs such as choline chloride-urea behaved poorly toward demineralization relative to PILs, they preserved cellulose effectively in the structure and gave satisfactory saccharification yields that reached over 90%. In addition to integrating the sustainable benefits of PILs and DESs into the valorization of PMS for the first time in literature, this work highlighted the competency of PMS as a cellulose-rich feedstock for biorefinery applications.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"42 1","pages":"274 - 285"},"PeriodicalIF":2.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42719075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-13DOI: 10.1080/02773813.2022.2085745
Tzu-Cheng Chang, Shang-Tzen Chang, Sen-Sung Cheng
Abstract Reactive oxygen species- (ROS) induced oxidation stress is a key cause of human health problems. Studies have shown that many diseases, such as Alzheimer’s disease, Parkinson’s disease, diabetes, carcinogenesis and inflammatory diseases, are associated with ROS. Plant polyphenols have the ability to remove these ROS in the human body, indicating their potential to improve human health. Zelkova serrata is a traditional medicinal plant in Taiwan and all of its plant parts have various health applications and even antioxidant activities. This study aimed to understand the antioxidant activities of bark polyphenols from Z. serrata and their active components. Results showed that the ethanolic extract of bark had free-radical scavenging abilities and reducing power. Although the extract barely had any flavonoids or condensed tannins, it comprised polar polyphenols with antioxidant activities. Furthermore, antioxidant activities in the extract originated mainly from lyoniresinol via hydrogen atom and electron transfer. These findings suggest that the bark extract of Z. serrata is also a potential resource for health improvement.
{"title":"Antioxidant activities of ethanolic extract and lyoniresinol from bark of Zelkova serrata","authors":"Tzu-Cheng Chang, Shang-Tzen Chang, Sen-Sung Cheng","doi":"10.1080/02773813.2022.2085745","DOIUrl":"https://doi.org/10.1080/02773813.2022.2085745","url":null,"abstract":"Abstract Reactive oxygen species- (ROS) induced oxidation stress is a key cause of human health problems. Studies have shown that many diseases, such as Alzheimer’s disease, Parkinson’s disease, diabetes, carcinogenesis and inflammatory diseases, are associated with ROS. Plant polyphenols have the ability to remove these ROS in the human body, indicating their potential to improve human health. Zelkova serrata is a traditional medicinal plant in Taiwan and all of its plant parts have various health applications and even antioxidant activities. This study aimed to understand the antioxidant activities of bark polyphenols from Z. serrata and their active components. Results showed that the ethanolic extract of bark had free-radical scavenging abilities and reducing power. Although the extract barely had any flavonoids or condensed tannins, it comprised polar polyphenols with antioxidant activities. Furthermore, antioxidant activities in the extract originated mainly from lyoniresinol via hydrogen atom and electron transfer. These findings suggest that the bark extract of Z. serrata is also a potential resource for health improvement.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"42 1","pages":"265 - 273"},"PeriodicalIF":2.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46314933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-09DOI: 10.1080/02773813.2022.2085747
M. Ermeydan, Merve Cambazoğlu, Eylem D. Tomak
Abstract Due to increasing environmental awareness, in recent years the research on classical wood preservation by hazardous impregnation chemicals has been shifted to more environmentally friendly chemical modification methods with organic molecules/polymers. The chemical modification processes rely on the replacement or blockage of wood hydroxyl groups with generally hydrophobic molecules, thereby improving the dimensional stability, water repellency and biological resistance of the wood. This study investigates in situ polymerization of ε-caprolactone to form poly(ε-caprolactone) (PCL), a biodegradable polymer, which was grafted to the wood cell walls of both Scots pine (Pinus sylvestris L.) and spruce wood (Picea orientalis L.). Wood modification by in situ polymerization of ε-caprolactone has been studied so far in order to be an alternative modification approach to obtain improved wood properties, such as good dimensional stability and improved water resistance without reducing mechanical properties considerably. In the light of previous studies, the current work proposes a methodological approach to ε-caprolactone modification in two aspects: (i) the effect of catalyst (tin(II) 2-ethylhexanoate) amount on wood properties (i.e., swelling (S), anti-swelling efficiency (ASE), water uptake (WU), mass loss (ML)) (ii) the effect of oven or solvent curing of ε-caprolactone on wood properties (i.e., S, ASE, WU, ML, compressive strength parallel to the grain, and chemical components). By these approaches, an optimum catalyst amount was determined, and an alternative method (oven-curing) which may be more economic by enabling the re-use of the waste chemical was evaluated in comparison to the method of ε-caprolactone modification in prior publications (solvent-curing).
摘要随着人们环保意识的增强，近年来对传统木材的有害浸渍剂防腐研究已转向更环保的有机分子/聚合物化学改性方法。化学改性过程依赖于用一般疏水分子取代或堵塞木材羟基，从而提高木材的尺寸稳定性、拒水性和生物抗性。本研究研究了ε-己内酯原位聚合形成聚(ε-己内酯)(PCL)，这是一种可生物降解的聚合物，并将其嫁接到松木(Pinus sylvestris L.)和云杉(Picea orientalis L.)的木材细胞壁上。ε-己内酯原位聚合改性木材是目前研究的一种替代改性方法，目的是在不显著降低机械性能的情况下，获得更好的木材性能，如良好的尺寸稳定性和更好的耐水性。在前人研究的基础上，本工作从两个方面提出了ε-己内酯改性的方法学方法:(i)催化剂(锡(II) 2-乙基己酸酯)用量对木材性能(即溶胀率(S)、抗溶胀率(ASE)、吸水率(WU)、质量损失(ML)的影响;(II)炉子或溶剂固化ε-己内酯对木材性能(即S、ASE、WU、ML、平行晶粒抗压强度和化学成分)的影响。通过这些方法，确定了最佳催化剂用量，并与先前发表的ε-己内酯改性方法(溶剂固化)进行了比较，评价了一种可替代的方法(烘箱固化)，该方法可以通过重复利用废弃化学品来获得更经济的效果。
{"title":"A methodological approach to ε-caprolactone modification of wood","authors":"M. Ermeydan, Merve Cambazoğlu, Eylem D. Tomak","doi":"10.1080/02773813.2022.2085747","DOIUrl":"https://doi.org/10.1080/02773813.2022.2085747","url":null,"abstract":"Abstract Due to increasing environmental awareness, in recent years the research on classical wood preservation by hazardous impregnation chemicals has been shifted to more environmentally friendly chemical modification methods with organic molecules/polymers. The chemical modification processes rely on the replacement or blockage of wood hydroxyl groups with generally hydrophobic molecules, thereby improving the dimensional stability, water repellency and biological resistance of the wood. This study investigates in situ polymerization of ε-caprolactone to form poly(ε-caprolactone) (PCL), a biodegradable polymer, which was grafted to the wood cell walls of both Scots pine (Pinus sylvestris L.) and spruce wood (Picea orientalis L.). Wood modification by in situ polymerization of ε-caprolactone has been studied so far in order to be an alternative modification approach to obtain improved wood properties, such as good dimensional stability and improved water resistance without reducing mechanical properties considerably. In the light of previous studies, the current work proposes a methodological approach to ε-caprolactone modification in two aspects: (i) the effect of catalyst (tin(II) 2-ethylhexanoate) amount on wood properties (i.e., swelling (S), anti-swelling efficiency (ASE), water uptake (WU), mass loss (ML)) (ii) the effect of oven or solvent curing of ε-caprolactone on wood properties (i.e., S, ASE, WU, ML, compressive strength parallel to the grain, and chemical components). By these approaches, an optimum catalyst amount was determined, and an alternative method (oven-curing) which may be more economic by enabling the re-use of the waste chemical was evaluated in comparison to the method of ε-caprolactone modification in prior publications (solvent-curing).","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"42 1","pages":"286 - 296"},"PeriodicalIF":2.0,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43580097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-09DOI: 10.1080/02773813.2022.2077966
Inês S. F. Mendes, Teresa Caldeira, A. Prates, D. Evtuguin
Abstract In this study, the sulphur oxide anions profile at all stages of the Mg acid sulphite pulping process was evaluated by Ion Chromatography (IC). The concentration of bisulphite anions decreased almost two-third along the cooking, while the sulphate concentration increased progressively. Of the bisulphite consumed, only a third was converted to sulfates. Unexpectedly, the maximum thiosulphate concentration was found in the pulping acid filling step, being further decreased along the cooking. The chloride ions rise progressively during the cooking being extracted essentially from the wood, although a noticeable part of the phosphate anions belongs to pulping reagents and inlet water. The low molecular weight fraction of lignosulphonates (LS) appeared in the cooking liquor in the residual delignification step and, together with xylonic acid, contributed to an overestimation of the fluoride concentration determined by the IC due to the same retention time in the chromatographic column during the analysis.
{"title":"Study of the anions profile throughout the sulphite pulp line","authors":"Inês S. F. Mendes, Teresa Caldeira, A. Prates, D. Evtuguin","doi":"10.1080/02773813.2022.2077966","DOIUrl":"https://doi.org/10.1080/02773813.2022.2077966","url":null,"abstract":"Abstract In this study, the sulphur oxide anions profile at all stages of the Mg acid sulphite pulping process was evaluated by Ion Chromatography (IC). The concentration of bisulphite anions decreased almost two-third along the cooking, while the sulphate concentration increased progressively. Of the bisulphite consumed, only a third was converted to sulfates. Unexpectedly, the maximum thiosulphate concentration was found in the pulping acid filling step, being further decreased along the cooking. The chloride ions rise progressively during the cooking being extracted essentially from the wood, although a noticeable part of the phosphate anions belongs to pulping reagents and inlet water. The low molecular weight fraction of lignosulphonates (LS) appeared in the cooking liquor in the residual delignification step and, together with xylonic acid, contributed to an overestimation of the fluoride concentration determined by the IC due to the same retention time in the chromatographic column during the analysis.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"42 1","pages":"244 - 252"},"PeriodicalIF":2.0,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49109144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-01DOI: 10.1080/02773813.2022.2080224
N. Gorshkova, I. Palamarchuk, O. Brovko, A. Volkov, A. Malkov, N. Bogdanovich, A. Ivakhnov, D. Chukhchin
Abstract This article was aimed at synthesizing new carbon-nitrogen nanomaterial from lignosulfonate/ chitosan (LS/CT) system via carbonization. The effect of LS molecular weight on the amount of nitrogen in the carbonizates, textural characteristics of carbon-nitrogen nanomaterials and their electrical properties was established by a variety of methods (SEM, AFM, BET, X-ray, IR, and dielectric spectroscopy). Structure of carbon-nitrogen nanomaterial is fractal with a high specific surface area (378–460 m2/g) and a significant pore volume (0.33–0.48 cm3). The electrical conductivity increases with an increase in the degree of disorder in the structure of carbon-nitrogen nanomaterial and correlates with the quantitative nitrogen content in the sample. The maximum electrical conductivity value was obtained for the sample with molecular weight of LS 67 kDa and is 0.71•10−7 S/cm. This study provides a novel method for the development of highly conductive carbon-nitrogen nanomaterials based on low-cost biopolymers that hold promise for a variety of practical applications.
{"title":"Semiconductor carbon-nitrogen nanomaterials based on interpolyelectrolyte complex sodium lignosulfonate-chitosan","authors":"N. Gorshkova, I. Palamarchuk, O. Brovko, A. Volkov, A. Malkov, N. Bogdanovich, A. Ivakhnov, D. Chukhchin","doi":"10.1080/02773813.2022.2080224","DOIUrl":"https://doi.org/10.1080/02773813.2022.2080224","url":null,"abstract":"Abstract This article was aimed at synthesizing new carbon-nitrogen nanomaterial from lignosulfonate/ chitosan (LS/CT) system via carbonization. The effect of LS molecular weight on the amount of nitrogen in the carbonizates, textural characteristics of carbon-nitrogen nanomaterials and their electrical properties was established by a variety of methods (SEM, AFM, BET, X-ray, IR, and dielectric spectroscopy). Structure of carbon-nitrogen nanomaterial is fractal with a high specific surface area (378–460 m2/g) and a significant pore volume (0.33–0.48 cm3). The electrical conductivity increases with an increase in the degree of disorder in the structure of carbon-nitrogen nanomaterial and correlates with the quantitative nitrogen content in the sample. The maximum electrical conductivity value was obtained for the sample with molecular weight of LS 67 kDa and is 0.71•10−7 S/cm. This study provides a novel method for the development of highly conductive carbon-nitrogen nanomaterials based on low-cost biopolymers that hold promise for a variety of practical applications.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"42 1","pages":"253 - 264"},"PeriodicalIF":2.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48485032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-14DOI: 10.1080/02773813.2022.2072892
Alina Meindl, J. Grzybek, A. Petutschnigg, T. Schnabel
Abstract Increasing concerns toward climate change and fossil fuel-based products have opened the race toward viable alternative feedstocks, which could be utilized as alternatives for omnipresent chemicals such as fuels and polymers. Lignin is among one of the most promising candidates. Besides its promising chemical characteristics, it has also been put in the spotlight due to its economic potential for biorefinery profitability and waste reduction. As the timber industry has to fight a constantly growing larch bark by-product stream we decided to investigate its potential capacity as valuable source of biopolymers. Deep eutectic solvents due to their biodegradability, reusability and efficiency have been chosen as the extraction method of choice. The reaction parameters were optimized resulting in a very high lignin yield of 93%. Furthermore, the work-up process was investigated with a focus on quantitative chemical recycling and potential for upscaling to industrial scale. Graphical Abstract
{"title":"High purity lignin from untreated larch bark: an efficient green methodology for lignin valorization and low-value by-product mitigation","authors":"Alina Meindl, J. Grzybek, A. Petutschnigg, T. Schnabel","doi":"10.1080/02773813.2022.2072892","DOIUrl":"https://doi.org/10.1080/02773813.2022.2072892","url":null,"abstract":"Abstract Increasing concerns toward climate change and fossil fuel-based products have opened the race toward viable alternative feedstocks, which could be utilized as alternatives for omnipresent chemicals such as fuels and polymers. Lignin is among one of the most promising candidates. Besides its promising chemical characteristics, it has also been put in the spotlight due to its economic potential for biorefinery profitability and waste reduction. As the timber industry has to fight a constantly growing larch bark by-product stream we decided to investigate its potential capacity as valuable source of biopolymers. Deep eutectic solvents due to their biodegradability, reusability and efficiency have been chosen as the extraction method of choice. The reaction parameters were optimized resulting in a very high lignin yield of 93%. Furthermore, the work-up process was investigated with a focus on quantitative chemical recycling and potential for upscaling to industrial scale. Graphical Abstract","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"42 1","pages":"235 - 243"},"PeriodicalIF":2.0,"publicationDate":"2022-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45526697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-14DOI: 10.1080/02773813.2022.2070646
Yang Qiu, Zhen Zhang, Shuai-Bo Liang, Yaning Miao, Chunli Yao
Abstract Wrapping paper has an irreplaceable role in the food industry, but the high hydrophilicity of cellulose-based wrapping paper limits its application. Here, we aim to develop a fluorine-free and stable method for preparing the superhydrophobic cellulose-based paper using KH570-modified-n-TiO2 and ε-polylysine (ε-PL) to construct a superhydrophobic surface by layer-by-layer self-assembly. The paper modified by (ε-PL/KH570-modified-n-TiO2)4 multilayers has superhydrophobic and self-cleaning properties after heat treatment. The water contact angle reaches up to 152.8° and the antibacterial rate is close to 100%. The high barrier properties to water vapor better prolong the shelf life of cherries. Therefore, the (ε-PL/KH570-modified-n-TiO2)4 multilayers modified paper can provide a new idea for food preservation. The advantage of the double-layer assembly is that even if the superhydrophobic layer of the wrapper is worn away and lost, the remaining ε-PL is still able to act as a bacterial inhibitor, ensuring that the food is not perishable.
{"title":"Preparation of fluorine-free and stable superhydrophobic paper for packaging","authors":"Yang Qiu, Zhen Zhang, Shuai-Bo Liang, Yaning Miao, Chunli Yao","doi":"10.1080/02773813.2022.2070646","DOIUrl":"https://doi.org/10.1080/02773813.2022.2070646","url":null,"abstract":"Abstract Wrapping paper has an irreplaceable role in the food industry, but the high hydrophilicity of cellulose-based wrapping paper limits its application. Here, we aim to develop a fluorine-free and stable method for preparing the superhydrophobic cellulose-based paper using KH570-modified-n-TiO2 and ε-polylysine (ε-PL) to construct a superhydrophobic surface by layer-by-layer self-assembly. The paper modified by (ε-PL/KH570-modified-n-TiO2)4 multilayers has superhydrophobic and self-cleaning properties after heat treatment. The water contact angle reaches up to 152.8° and the antibacterial rate is close to 100%. The high barrier properties to water vapor better prolong the shelf life of cherries. Therefore, the (ε-PL/KH570-modified-n-TiO2)4 multilayers modified paper can provide a new idea for food preservation. The advantage of the double-layer assembly is that even if the superhydrophobic layer of the wrapper is worn away and lost, the remaining ε-PL is still able to act as a bacterial inhibitor, ensuring that the food is not perishable.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"42 1","pages":"222 - 234"},"PeriodicalIF":2.0,"publicationDate":"2022-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48600707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The dilemma of insufficient wood resources and poor properties of fast-growing wood necessitates a breakthrough in the expansion and efficient utilization of wood resources to meet the real needs. With the aim of enhancing the properties of fast-growing poplar wood, a combination of PVA and nano-silica sol impregnation treatment was carried out to develop a novel functional wood material with good dimensional stability, compressive strength and thermal stability, while fully exploiting the unique structural properties of the wood itself. In this work, PVA-nano-silica sol composite wood was prepared by in-situ impregnation of poplar fast-growing wood via ultrasound-assisted and vacuum impregnation methods. Firstly, the effects of different treatments on the impregnation effect and strengthening effect of modified wood were explored. The results showed that the PVA-nano-silica sol dispersion system had no negative effect on the impregnation modification, and the compressive strength of modified wood was obviously improved compared with natural wood. Among them, the most effective modification was achieved under the condition of vacuum-assisted impregnation. The effect of compound impregnation modification on the structure of poplar fast-growing wood was analyzed by FTIR, XRD, SEM, and EDS, in which PVA and nano-silica sol can form a certain cross-linking system and form chemical bonds such as Si-O-C and Si-O-Si, enabling them to enter the structure of wood and react with wood cell walls effectively. The compressive strength of modified poplar wood was increased by 72.29% compared with natural poplar wood. According to the thermogravimetric analysis, the thermal stability of the modified poplar wood was improved to some extent. In view of all the results, the method proposed in this study provides an opportunity for the high value utilization of low quality wood, and this modified wood can be considered as a candidate for new lightweight and high performance materials in the construction field.
{"title":"Preparation and properties of modified poplar impregnated with PVA-nano silica sol composite dispersion system","authors":"Hong Yang, Dongyue Wang, Yu Han, Peiran Tian, Chao Gao, Xinyu Yang, Hongbo Mu, Mingming Zhang","doi":"10.1080/02773813.2022.2064875","DOIUrl":"https://doi.org/10.1080/02773813.2022.2064875","url":null,"abstract":"Abstract The dilemma of insufficient wood resources and poor properties of fast-growing wood necessitates a breakthrough in the expansion and efficient utilization of wood resources to meet the real needs. With the aim of enhancing the properties of fast-growing poplar wood, a combination of PVA and nano-silica sol impregnation treatment was carried out to develop a novel functional wood material with good dimensional stability, compressive strength and thermal stability, while fully exploiting the unique structural properties of the wood itself. In this work, PVA-nano-silica sol composite wood was prepared by in-situ impregnation of poplar fast-growing wood via ultrasound-assisted and vacuum impregnation methods. Firstly, the effects of different treatments on the impregnation effect and strengthening effect of modified wood were explored. The results showed that the PVA-nano-silica sol dispersion system had no negative effect on the impregnation modification, and the compressive strength of modified wood was obviously improved compared with natural wood. Among them, the most effective modification was achieved under the condition of vacuum-assisted impregnation. The effect of compound impregnation modification on the structure of poplar fast-growing wood was analyzed by FTIR, XRD, SEM, and EDS, in which PVA and nano-silica sol can form a certain cross-linking system and form chemical bonds such as Si-O-C and Si-O-Si, enabling them to enter the structure of wood and react with wood cell walls effectively. The compressive strength of modified poplar wood was increased by 72.29% compared with natural poplar wood. According to the thermogravimetric analysis, the thermal stability of the modified poplar wood was improved to some extent. In view of all the results, the method proposed in this study provides an opportunity for the high value utilization of low quality wood, and this modified wood can be considered as a candidate for new lightweight and high performance materials in the construction field.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"42 1","pages":"211 - 221"},"PeriodicalIF":2.0,"publicationDate":"2022-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48984267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-28DOI: 10.1080/02773813.2022.2068603
S. Magina, Inês S. F. Mendes, A. Prates, D. Evtuguin
Abstract The re-profiling from paper-grade to dissolving pulp production is a common trend for acid sulfite cooking of wood. This provides substantial changes in the composition of the spent sulfite liquor (SSL) affecting its potentialities in subsequent processing within the biorefinery concept. In this work, a comparative analysis of the chemical composition of SSL was performed from the magnesium-based acid sulfite cooking of Eucalyptus globulus wood to produce the paper-grade and dissolving pulps. More severe pulping conditions required for dissolving pulp production led to a substantial increase in volatile compounds in SSL, such as acetic acid, methanol, and furfural. At the same time, the amounts of dissolved sugars and lignosulfonates (LS) were increased to a less extent. The main changes detected in LS were related to the increase of its molecular weight, degree of condensation, and sulfonation degree. The increased concentration of the sulfuric acid in SSL was one of the reasons for these changes.
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Pub Date : 2022-04-28DOI: 10.1080/02773813.2022.2067562
Gabriela Mijas, M. Lis, Sonia Pérez-Rentero, M. Riba-Moliner, M. Martí, D. Cayuela, A. Manich
Abstract Raw hemp (Cannabis sativa L.) was subjected to alkaline delignification with the application of NaOH ranging from [0.125M] to [1M] for times from 5 to 480 min. Lignin contents of the original and delignified samples were determined. The samples were subjected to thermogravimetric analysis (TGA) under a N2 atmosphere with temperatures ramped from 25 to 600 °C at 10 °C min-1. Lignosulfonates samples of low, medium and high molecular weight were subjected to the same TGA and showed that lignin decomposed over the entire temperature range. The contributions of lignin to the mass loss during thermal decomposition of hemp and kinetics of lignin content and the most relevant TGA results were determined. Regression models estimating the lignin content of the fibers based on TGA results were formulated. These models allow for the prediction of mean lignin content within ± 0.1% (based on dry weight of pulp) in the central range of the experimental field.
{"title":"Kinetics of alkaline delignification of hemp and determination of lignin content by thermogravimetry","authors":"Gabriela Mijas, M. Lis, Sonia Pérez-Rentero, M. Riba-Moliner, M. Martí, D. Cayuela, A. Manich","doi":"10.1080/02773813.2022.2067562","DOIUrl":"https://doi.org/10.1080/02773813.2022.2067562","url":null,"abstract":"Abstract Raw hemp (Cannabis sativa L.) was subjected to alkaline delignification with the application of NaOH ranging from [0.125M] to [1M] for times from 5 to 480 min. Lignin contents of the original and delignified samples were determined. The samples were subjected to thermogravimetric analysis (TGA) under a N2 atmosphere with temperatures ramped from 25 to 600 °C at 10 °C min-1. Lignosulfonates samples of low, medium and high molecular weight were subjected to the same TGA and showed that lignin decomposed over the entire temperature range. The contributions of lignin to the mass loss during thermal decomposition of hemp and kinetics of lignin content and the most relevant TGA results were determined. Regression models estimating the lignin content of the fibers based on TGA results were formulated. These models allow for the prediction of mean lignin content within ± 0.1% (based on dry weight of pulp) in the central range of the experimental field.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"42 1","pages":"181 - 192"},"PeriodicalIF":2.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44142357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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