FUEL
·
2022
·
IF 8.035
Haitao Yu,Yang Xu,Meng Zhang,Li Zhang,Wenjin Wu,Kun Huang
The creation of non-noble metal magnetically-separable heterogeneous catalysts for the hydrodeoxygenation of biomass to value-added products has received substantial attention. Herein, we report a facile synthesis of magnetically-separable cobalt catalyst embedded in hierarchically porous N-doped carbon nanospheres (Co@N C) by in situ non-noble metal nitrate-promoted pyrolysis reduction strategy using nitrogen/oxygen co-doped resin polymer spheres as precursors. The facile H 2 O 2 post-treatment process increased surface oxygen-containing groups and improved hydrophilicity to disperse catalysts in aqueous solutions. Moreover, owing to the non-noble metal nanoparticles coated with a graphitic nitrogen-doped carbon layer, the as-prepared Co@N C H 2 O 2 catalyst exhibits excellent catalytic activity and stability of vanillin hydrodeoxygenation in aqueous solutions. This strategy can be extended to other non-noble metal nitrates like M@N C H 2 O 2 (M = Co, Ni) within good recyclability, magnetically-separable ability, and general applicability for a broad substrate scope, further highlighting the superiority of our active catalysts.
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Xiaohui Guo,Yingjuan Fu,Fawei Miao,Quanshui Yu,Na Liu,Fengshan Zhang
Thermal acetic acid/sodium acetate hydrolysis (ASH) on poplar wood chips were carried out to obtain functional xylooligosaccharide, then the hydrolyzed wood chips were subjected to kraft pulping (KP) to fractionate cellulose and lignin. The separated three fractions were extensively characterized for further utilization in view of the integral biorefinery concept. The extraction efficiency of hemicelluloses by ASH strongly depends on the buffer ratio of the acetic acid/sodium acetate buffer solution. The ASH facilitated producing a high ratio of xylooligosaccharides with high molecular weight, while prevented further degradation of the saccharides, and simultaneously inhibited the condensation of lignin facilitating the subsequent kraft delignification. The obtained cellulose pulps had higher intrinsic viscosities as compared with the traditional autohydrolysis-KP process. Moreover, the ASH-KP process delivered a high purity of lignin with relatively high molecular weight. Therefore, the proposed integrated fractionation strategy is conducive to convert the lignocellulosic components into bio-based functional materials.
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DOI
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 3
·597-605
·
IF 9.405
Shaoqi Yang,Xingmei Lu,Haoyu Yao,Jiayu Xin,Junli Xu,Ying Kang,Yongqing Yang,Guangming Cai,Suojiang Zhang
Selective catalytic hydrotreatment of lignin-derived phenols and dimeric ethers into alkanes is crucial for utilization of lignin and its fragments. Herein, we developed an efficient catalytic system with well-dispersed metal nanoparticles supported on SBA-15 synergistic with an ionic liquid. The catalytic system could catalyze the hydrodeoxygenation (HDO) of various monomeric and dimeric lignin-derived phenols into the corresponding alkanes under acid free conditions. The synergistic [Bmim]PF6-Ru/SBA-15 (1-butyl-3-methylimidazolium hexafluorophosphate) catalysis exhibited the best HDO activity for lignin-derived phenols and dimeric ethers with >99.0% conversion and maximum >98.0% selectivity of the corresponding alkanes. The yield of cyclohexane from diphenyl ether was 97.7% with 100% conversion under 2 MPa H2 at 130 °C for 6 h. The mechanism investigation confirmed that the Ru/SBA-15 catalyst and the anion of [Bmim]PF6 played crucial roles in the hydrogenation process and deoxidization process, respectively. The catalytic system was reused six times for HDO of diphenyl ether to test its stability.
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DOI
高影响因子
Biochar
·
2021
·Vol. 3
·期 3
·391-405
·
IF 0
Li Chao,Sun Yifan,Zhang Lijun,Wang Changxu,Zhang Shu,Li Qiaoling,Xu Leilei,Hu Xun
Biomass and pig manure have distinct compositions and the co-pyrolysis of them has gained much attention. However, the influence of volatiles interaction on the properties of the char was still unclear. In this study, lignin was selected as the model component of biomass with pig manure for co-pyrolysis at 600 °C. The results indicate that volatiles from co-pyrolysis promoted re-condensation reaction, resulting in the higher char yield (48.0% in co-pyrolysis versus 31.0% in pyrolysis of single manure) and the formation of more aromatics in bio-oil. The co-pyrolysis also facilitated the dehydrogenation and dehydration reactions, which accounted for the elimination of oxygen and nitrogen contents and thus a higher carbon content (64.7% in the co-pyrolysis versus the averaged value of 46.4% from the pyrolysis of single feedstock), higher crystallinity and thermal stability of the char. The in-situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) characterization results demonstrated that the functionalities abundances of char with temperature was influenced by volatiles interaction via accelerating the carbonization reaction. In addition, the high heating value (HHV) of char was obviously improved by cross-interaction of volatiles during co-pyrolysis (24.4 MJ/Kg in co-pyrolysis versus averaged value of 15.1 MJ/Kg from single pyrolysis), implying that the co-pyrolysis enhanced the energy density of the resulting char. Graphic abstract
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DOI
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Siyu Zhao,Xinrui Chen,Caixia Zhang,Peitao Zhao,Arthur J. Ragauskas,Xueping Song
Black liquor is an important pollutant in the pulp industry, but it also has the potential for high-value utilization. In this study, lignin extracted from black liquor was hydrothermally prepared into lignin-based carbon quantum dots (L-CQDs) using a one-pot method. Physicochemical characterization suggested that the L-CQDs exhibited a lamellar core–shell multilayered graphene structure surrounded by oxygen-containing functional groups. The fluorescence intensity of the L-CQDs was strengthened depending on their own concentration dependence and the doping of external groups. The fluorescence intensity of L-CQDs varied between 89.09 and 183.66 under different concentrations, and the most intense fluorescence (183.66) was obtained at 0.1 mg mL–1. At hydroxyl and amino adsorption capacities of 11.08 and 0.98 mmol g–1, the hydroxylated RL-CQDs-5 and aminated NL-CQDs-3 exhibited the highest fluorescence intensities at 689.22 and 605.39, respectively. Moreover, when pristine L-CQDs were sequentially aminated and hydroxylated, the NRL-CQDs’ fluorescence intensity reached 1224.92. Cell imaging experiments proved that cells cultivated with NRL-CQDs have brighter fluorescence compared with L-CQDs. The results will render L-CQDs more suitable for practical applications.
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DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Jing Yang,Liang Zhao,Chunze Liu,Yuanyuan Wang,Liyi Dai
Efficient catalytic ethanolysis and gasification of kraft lignin were conducted over a versatile supported catalyst Rh/La 2 O 3 /CeO 2 –ZrO 2 to give high-value aromatic alcohols and H 2 -rich gas. The removal of phenolic hydroxyl group was the most prevalent reaction, and importantly, almost no phenols, undesired char and saturating the aromatic ring were detected. Meanwhile, the feedstock and solvent both played key roles in H 2 generation that contributed to the hydrodeoxygenation of liquid components and made the whole catalytic process out of H 2 supply. Reusability tests of catalyst indicated that the crystalline phase transition and agglomeration of support, the loss of noble metal Rh and carbon deposition were the possible reasons for its deactivation in supercritical ethanol. Comparing with water, methanol and isopropanol system, ethanol was the only effective solvent for the depolymerization process.
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Yingying Yang,Jingyu Xu,Yanzhu Guo,Xing Wang,Ling-Ping Xiao,Jinghui Zhou
Laccase is a highly versatile multicopper oxidase for lignin biodegradation. Using nanomaterials to realize functional laccase simulations is attractive for applications and fundamental research. Herein, this study reports a facile strategy to fabricate a Cu metal–organic framework (MOF) by using copper as a metal center with guanosine 5′-monophosphate (GMP) as organic ligands (Cu/GMP). This obtained catalyst exhibits excellent chemoselectivity for lignin depolymerization into oligomers with low molecular weights at room temperature and atmospheric pressure. It was found that Cu/GMP shows superior laccase-like activity, which is beneficial for the C–O bond cleavage within lignin, thus affording oligomers in a high yield (81.7 wt %). Furthermore, the effects of the obtained lignin oligomers on the oxidative stability of canola oil biodiesel were evaluated. They were novel, renewable, and of low cost, which as biodiesel additives exhibited high potential in replacing expensive merchand biodiesel antioxidants commonly used to date.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Zhuang Liu,Yi Hou,Lirong Lei,Song-Qing Hu
This study presents a rapid and easy method for preparing a multifunctional hydrogel composed of lignin obtained by deep eutectic solvent pretreatment (DESL), Al3+ and polyacrylic acid (PAA) in aqueous system. DESL with high purity proves to be an exceptional raw material for the production of hydrogel-based moisture-induced electricity generators (HMEG), surpassing alkali lignin in availability and lignosulfonates in versatility. The resulting hydrogel exhibits exceptional self-adhesive, flexible, plastic, and self-healing characteristics with a tensile strength of 1.57 MPa and a tensile rate of 1580%. A single HMEG generated impressive voltage of 2.78 V/cm-3 and current of 22 μA/cm-3, which can function as a motion-sensor without an external power supply. This study presents a novel approach aimed at maximizing the DESL value and expediting the development of a hydrogel moisture power generation device that is both cost-effective and efficient, while also considering ecological considerations.
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DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 7
·976-989
·
IF 4.5
Yan Bowen,Lu Geng,Wang Rong,Kang Shixiong,Huang Caoxing,Wu Hao,Yong Qiang
Lignin exhibits antioxidative and various other biological properties. However, its neuroprotection capability has rarely been studied. In this study, three types of lignin with different structures were prepared from grape seeds by using different isolation techniques. The antioxidative and neuroprotective effects of the lignin fractions were evaluated with the apoptosis model of murine neuroectodermal (NE-4C) neural stem cells stimulated with bisphenol AF. The results demonstrated that the half maximal inhibitory concentration for scavenging 2,2-diphenyl-1-picrylhydrazyl with water-soluble lignin (L-W, 58.19 µg·mL −1 ) was lower than those of lignin in the autohydrolyzed residue of grape seeds (84.27 µg·mL −1 ) and original lignin in grape seeds (99.44 µg·mL −1 ). BPAF exposure had negative effects on the reactive oxygen species, malondialdehyde content, and superoxide dismutase and glutathione peroxidase activities in NE-4C cells, which can be reversed by using the prepared lignin to reduce oxidative stress. An immunofluorescence assay demonstrated that grape seed lignin induced protective effects on BPAF-injured NE-4C cells via the nuclear factor erythroid 2-related Factor 2 pathway. In addition, correlational analyses showed that lignin (L-W) with lower molecular weights and noncondensed phenolic hydroxyl group content and higher contents of COOH groups effectively prevented cell apoptosis, scavenged reactive oxygen species, and ensured protection from nerve injury. This study demonstrated that grape seed lignin can be used as a neuroprotective agent and serves as a demonstration of active lignin production from grape seed waste.
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DOI
高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 17
·期 11
·4968-4973
·
IF 8.02
Yangyang Ma,Zhongtian Du,Junxia Liu,Fei Xia,Jie Xu
Selective transformation of lignin into value-added aromatics is highly attractive and rather challenging. Catalytic oxidative degradation provides a promising approach to obtain aromatics from lignin while preserving the benzene units. In this study, vanadium-catalyzed aerobic oxidation of 2-phenoxy-1-phenylethanol was studied as a lignin model compound. The solvent played a significant role in the distribution of oxidation products. In the presence of acetic acid, oxidative C–C bond cleavage was preferred, while oxidation products via C–H bond cleavage were rather limited. A one-electron transfer process was involved in the oxidation reaction. The occurrence of vanadium(V) was detected, and the carboxylic group could coordinate to vanadium(V) through exchange with the acetylacetonato ligand during oxidation in the presence of acetic acid.
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Tao Ding,Yishuang Wu,Xun Zhu,Guiying Lin,Xun Hu,Hongqi Sun,Yong Huang,Shu Zhang,Hong Zhang
Co-doping of heteroatoms into the support of metal-supported catalysts is a prevalent method to improve the catalytic performance by adjusting metal–support interactions. This paper investigated the catalytic performances of Ru supported on biomass-derived char (Ru@Char), N-doped char (Ru@N-Char), and N,P-co-doped char (Ru@NP-Char) in the emerging lignin-first depolymerization for both poplar (hardwood) and pine (softwood) samples, with an emphasis on the production of phenolic monomers. Various characterizations of the prepared catalysts showed that the codoping of N,P not only facilitated the formation of micropores in the char but also introduced weak and moderate acid sites. Furthermore, the sizes of Ru nanoparticles on the codoped char became smaller, and the proportion of metallic Ru species was increased, resulting from electron transfer from Ru to the codoped char. The yields of the phenolic monomers from poplar and pine over Ru@NP-Char were as high as 57.98 and 17.53 wt % Klason lignin, respectively, which were improved by factors of 1.4–2.5 in comparison to Ru@Char and Ru@N-Char. Full delignification during the depolymerization of both poplar and pine was also achieved over Ru@NP-Char.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Honghong Deng,Xi Liang,Ziyang Zhang,Chao Peng,Xueying Wang,Liumin Li,Binqi Li,Qiang Yang,Junwei Liu,Muhammad Moaaz Ali,Sheng-Yen Wu,Faxing Chen
Plums are economically important stone fruits, valued for their nutritional quality and health-promoting properties. However, their quality and marketability are often compromised by a physiological disorder called fruit hollowness and browning (HB). This study employed an integrated physiological, biochemical, and proteomic approach to investigate the molecular mechanisms underlying HB in Huangguan plum. Huangguan plum fruit samples from seven developmental stages were analyzed for lignin content, key enzyme activities, and expression patterns of genes involved in lignin biosynthesis. The results demonstrated that HB-affected fruit accumulated significantly higher lignin levels, particularly during post-veraison stages, accompanied by elevated activities of lignin biosynthesis-related enzymes like phenylalanine ammonia-lyase and laccase. Expression analysis of lignin pathway genes revealed distinct transcriptional dynamics, with notable upregulation of PsPAL1 and PsLAC7 in HB fruit at critical developmental stages. Proteomic profiling identified 941 and 1249 differentially expressed proteins between HB and non-HB fruit at the veraison and ripe stages, respectively. KEGG enrichment analysis highlighted significant alterations in the phenylpropanoid biosynthesis pathway (map00940), which is central to lignification. These findings provide new insights into the physiological and molecular basis of HB in plum fruit and a scientific foundation for developing effective strategies to mitigate or address this disorder and improve fruit quality.
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DOI
PubMed
高影响因子
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