RSC Advances
·
2017
·Vol. 7
·期 79
·50027-50034
·
IF 3.108
Huizhen Wang,Wenzhi Li,Jindong Wang,Hou-min Chang,Hasan Jameel,Qi Zhang,Song Li,Lele Jin
The solid, super, acid catalyst S2O82−/ZrO2–TiO2–SiO2, which has both a strong Brønsted acid and Lewis acid, was prepared and applied in lignin depolymerization. The results indicate that S2O82−/ZrO2–TiO2–SiO2 is an effective catalyst for lignin depolymerisation since the liquid product was almost completely dissolved in ethyl acetate, indicating that it was comprised of mostly oligomeric lignin degradation products. The effect of hydrogenation co-catalysts (Pd/C, Pt/C and Ru/C, Rh/C) were also studied and found to improve the yield of aromatic compounds and the petroleum ether soluble fraction, which are mostly monomeric and dimeric products. The resulting yields of aromatic compounds and petroleum ether soluble products were 14.8% and 46%, respectively, when S2O82−/ZrO2–TiO2–SiO2 and Pt/C mixed catalyst was used at 310 °C for 24 hours. These results show that the use of a combination Brønsted and Lewis acid catalyst in combination with a hydrogenation catalyst (S2O82−/ZrO2–TiO2–SiO2 together with a noble metal catalyst) opens a practical route for efficient lignin depolymerization.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Haitao Yang,Mengzhen Chai,Chang Geun Yoo,Jie Yuan,Xianzhi Meng,Lan Yao
A novel efficient pretreatment system containing alkaline deep eutectic solvent (DES) and tetrahydrofuran (THF) was developed in the present study. Under pretreatment conditions of 160 ℃ and 1 h, DES-THF pretreatment was more efficient (81.61%) in cellulose digestibility improvement than DES (choline chloride/monoethanolamine, 67.54%). To further explore lignin structural transformation and lignin-cellulase interaction after pretreatment, milled wood lignin (MWL) was extracted and characterized. Compared with DES-MWL, DES-THF-MWL showed an increased carboxyl group content (24.0%) and decreased condensed phenolic hydroxyl content (9.1%). In DES-MWL, β-O-4 content was 21.79%, while in DES-THF-MWL, β-O-4 accounted for 45.45%, indicating that the addition of THF alleviated cleavage of β-O-4 alkyl ether bonds. Fluorescence emission spectroscopy results showed that quenching mechanism of DES-THF-MWL and cellulase was dynamic, which was different from other lignin. Compared with DES-MWL, decreased K a between DES-THF-MWL and cellulase indicated decreasing interaction between them. DES-THF pretreatment provides a novel pretreatment method for bioenergy.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Wenxuan Wu,Peiwen Zhu,Liping Luo,Hongyan Lin,Yuheng Tao,Lingyu Ruan,Liqun Wang,Qing Qing
Deep eutectic solvent (DES) is a newly-emerged green solvent for efficient pretreatment of lignocellulosic feedstock. To improve the component fractionation performance of neutral DES , p- toluenesulfonic acid ( p- TsOH) was employed as catalyst to form a novel ternary DES with benzyltriethylammonium chloride (TEBAC) and glycerol (Gly) for pretreatment of soybean straw. Under the optimum reaction conditions (TEBAC:Gly = 1:12, 1.6 wt% p- TsOH and reacted at 90 °C for 160 min), the lignin and hemicellulose removal from soybean straw were amounted to 92.0 % and 88.2 %, respectively. The pretreated substrate showed satisfactory enzymatic hydrolysis performance, as the glucose and reducing sugar concentrations reached 37.3 g/L and 42.3 g/L, respectively, after 72 h saccharification under the action of cellulase with a relatively low enzyme loading of 10 FPU/g cellulose. This method provides an efficient and mild route for utilization of agricultural waste and production of platform monosaccharides.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Quanzhou Xu,Xing Fei,Xueqing Qiu,Xiaofei Wang,Tiejun Wang,Xuliang Lin,Sha Li,Yanlin Qin
The selective conversion of biomass-derived ethanol into higher alcohols is a desirable but challenging process for the efficient production of value-added chemicals from alternative carbon sources. However, the current catalysts used in ethanol coupling exhibit low conversion rates and yields towards the formation of higher alcohols, necessitating significant improvements in their efficiency for practical applications. In this work, a lignin-derived N-doped carbon- supported Ni catalyst for ethanol coupling was designed and synthesized. The Ni@NC catalyst, synthesized using diethylenetriamine as the nitrogen source with a mass ratio of nitrogen source to lignin of 2:1 and a molar ratio of metal to lignin of 20:1, demonstrated excellent performance, with an ethanol conversion rate of 81.1% and a yield of C 4+ alcohols reaching 35.3%. Experimental results and density functional theory (DFT) calculations suggest that nitrogen-doped lignin, in appropriate quantities, along with the metal active component, forms a Ni-N-C structure that controls charge redistribution between the support and the Ni catalyst. This structure hinders the interaction of reaction intermediates and inhibits the production of by-products in the decomposition reaction, resulting in a higher yield of C 4+ alcohols. This study presents a more cost-effective and efficient approach for developing ethanol-coupling catalysts and holds promise for expanding the utility of lignin-derived catalysts.
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Carbon Capture Science & Technology
·
2024
·
IF 10.4
Zhiqiang Chen,Mingwei Xia,Ying Gao,Wanli Ma,Yingquan Chen,Xianhua Wang,Hanping Chen,Haiping Yang
Hydrothermal reactions can convert lignin into carbon dots, and the process often uses acids as additives, but the mechanism of action is not clear. In this study, lignin-based carbon dots were successfully prepared by HNO 3 -assisted one-pot hydrothermal method. The mechanism of the influence of the acidic environment on the structure and optical properties of lignin-based carbon dots was also investigated by changing the addition amount of HNO 3 . It was found that the particle size distribution of carbon dots collected was 1-5 nm, and they could emit bright blue fluorescence under violet light irradiation with the highest fluorescence quantum yield of 10.17%. HNO 3 acts on the branched chains and ether bonds of alkali lignin, prompting the depolymerization of lignin and re-cross-linking and condensation to form lignin-based carbon dots. With the increase of HNO 3 addition, the carbon core of lignin-based carbon dots gradually transformed from amorphous structure to complete graphene-like structure, and the emission wavelength of lignin-based carbon dots shifted from 517 nm to 499 nm, and the fluorescence quantum yield was increased from 2.61% to 10.17% by the effect of integrated N doping, which is of great significance for the analysis of the conformational relationship of lignin-based carbon dots, and for the guidance of the high-efficiency synthesis of lignin-based carbon dots.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Yushan Liu,Xiongxiong Cao,Jingya Mao,Li Niu
Phase change materials (PCMs) have been recently introduced as key thermal energy storage medium in several thermal applications, specifically in solar thermal energy. However, the feasibility of their application in solar thermal storage has been limited by leakiness during solid-liquid phase conversion, low thermal conductivity, and low energy conversion rate. Herein, the poly (ethylene glycol) (PEG)-based PCMs (LNCAs/PEG/E51) were constructed via vacuum impregnation technology, employing the electrospinning lignin nanofiber carbon aerogels (LNCAs) as the supporting materials , heat conduction path and photothermal agent. And the in situ cross-linking epoxy resin (E51) was used to further prevent leakage and enrich the thermal conductive network. The thermal conductivity of LNCAs/PEG/E51 was 0.67 W·m −1 ·K −1 , which was about 3 times higher than that sample without the LNCAs. It also exhibited a high latent heat of fusion (87.95 J·g −1 ), favorable stability over 100 heating-cooling cycles, and thermal stability below 224.78 ℃. The solar-thermal energy conversion and storage efficiency of LNCAs/PEG/E51was higher to 81.72 % owning to efficient non-radiative transition of electrons. For the first time, we used LNCAs as support, thermal conductive and photothermal matrix for PCMs. The study established a channel for simultaneous high-value utilization of lignin and solar energy, which has reference value to some extent.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Haitao Ren,Yuqing Chen,Abdelkader Labidi,Ke Zhao,Xiaoqian Xu,Sarah I. Othman,Ahmed A. Allam,Hassan Ahmad Rudayni,Chuanyi Wang
Developing carbon quantum dots (CQDs) from bio-waste lignin for effectively detecting Cu 2+ is of great significance for promoting the value-added utilization of lignin resources. However, the limited amount of surface-active groups and low quantum yield of lignin-based CQDs hinder their application in this regard. Herein, bio-waste lignin was converted into value-added amine functionalized CQDs using a facile two-step hydrothermal approach. The as-synthesized CQDs modified with amino groups exhibit bright green fluorescence, abundant surface functional groups, high water solubility and uniform particle size (3.9 nm). Systematic analysis demonstrates that the rich NH 2 groups (~12.3 %) on the CQDs backbone improve their fluorescence properties (quantum yield increased from 3.4 % to 21.1 %) and specific detection ability for Cu 2+ . The developed NH 2 -CQDs serve as an efficient fluorescent probe , displaying high sensitivity and selectivity towards Cu 2+ in aqueous system, with a detection limit of 2.42 μmol/L, which is lower than the maximum permitted amount of Cu 2+ in drinking water (20 μmol/L). The detection mechanism of NH 2 -CQDs for Cu 2+ is attributed to the synergy of static quenching and photo-induced electron transfer . This study provides a valuable reference for the synthesis of high-quality fluorescent CQDs from lignin resources and the effective detection of trace Cu 2+ in aquatic environments.
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JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Bohan Liu,Jiayue Chen,Zhou Zhou,Wanli Cheng,Qinglin Wu,Yiying Yue
A highly flexible lignin-based carbon nanofibrous membrane functionalized with SnO 2 /BiOBr core-shell heterostructure (CNFs@SnO 2 /BiOBr) was fabricated via coaxial electrospinning and solvothermal synthesis. By positioning the SnO 2 precursor in the shell layer during electrospinning, rapid and stable stabilization of the lignin nanofiber at a rate of 1°C/min was achieved, significantly reducing the high-energy consumption constraints of traditional preparation processes. Experimental results demonstrated that the CNFs not only enhance light absorption capacity and promote electron transfer but also effectively suppress the recombination of electron-hole pairs at the SnO 2 /BiOBr heterojunction, thereby improving charge separation efficiency. Under LED light irradiation, the CNFs@SnO 2 /BiOBr membrane exhibited a degradation efficiency of 87.3% for Rhodamine B within 100 min with optimal performance at natural pH (6.2), increasing to 93.0% at pH 3.5. Additionally, the composite membrane maintained a stable efficiency of 84.5% after five cycles at pH 6.2, owing to its outstanding photocatalytic performance and self-supporting structure (tensile strength of 0.601 MPa and elongation at break of 6.10%). This research offers a sustainable approach to designing flexible photocatalytic membranes for wastewater treatment, emphasizing environmental and green significance while enhancing biomass resource efficiency. By improving heterojunction catalytic efficiency and addressing the challenge of recovering traditional powders, it demonstrates promising applications in advancing sustainable wastewater treatment solutions.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jinlong Zhang,Shiyu Fu,Hao Liu,Boshi Feng,Xuedi Yang,Busheng Zhang
Developing MXene-based electromagnetic interference (EMI) shielding composite films with exceptional wet mechanical properties is crucial to address the limitation of conventional MXene-based EMI shielding composite films in humid environments. Herein, we present a fabrication strategy for Janus-structured MXene-based EMI shielding composite films with exceptional wet mechanical and Joule heating performances. Through depositing tannic acid-modified MXene (TM) on maleic anhydride-modified lignin-containing cellulose nanofibril (MLCNF) film using a scalable vacuum filtration and hot-pressing strategy. The Janus-structured MLCNF/TM composite film (J-MLCNF/TM) was fabricated. With the synergistic contribution of the introduced Janus structure, TM, and MLCNF substrate with high wet mechanical properties and extensive hydrogen bonding interactions, J-MLCNF/TM achieved an optimal balance between mechanical and EMI shielding properties. The optimized J-MLCNF-50 %/TM 10 (50 wt% MLCNF) exhibits excellent wet tensile strength (72.69 MPa), remarkable wet toughness (15.43 MJ m −3 ), and high EMI shielding efficiency of 36.22 dB. Furthermore, J-MLCNF-50 %/TM 10 showed outstanding Joule heating performance at low voltages, featuring excellent heating stability, deicing capability, and reliable performance in humid environments. In summary, this study offers a facile and efficient approach for the application of MXene-based EMI shielding materials in humid environments.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chenguang Zhang,Zilu Zhang,Chuancheng Dongye,Xiaofei Xu,Zhihe Li,Weiming Yi,Xiaobo Chen,Shaoqing Wang
Spent bleaching clay (SBC) and lignin wastes are generated from oil refining and paper industries, respectively. The complementary properties of these two types of waste enable synergistic effects in co-pyrolysis, thereby mitigating limitations characteristic of single-component pyrolysis. In this study, the co-pyrolysis behavior of the two wastes was explored at the microscopic molecular level using simultaneous TG-FTIR technology, coupled with fixed-bed pyrolysis experiments. The co-pyrolysis behavior was systematically investigated at the mass ratio of lignin and SBC (0 %L, 30 %L, 50 %L, 70 %L, and 100 %L) and different reaction temperatures (450, 500, 550, 600, and 650 °C). The results showed that the activation energy required for co-pyrolysis decreased at 50 %L and 70 %L ratios, as determined using FWO and KAS methods. The Ea required for co-pyrolysis decreased at 50 %L and 70 %L ratios. Specifically, the addition of 30 % SBC reduced the activation energy of lignin from 141.67 kJ/mol (KAS) and 146.41 kJ/mol (FWO) to 120.25 kJ/mol (KAS) and 126.04 kJ/mol (FWO), respectively. Furthermore, the 50 %L radio infrared absorbance of CH 4 and CO 2 was relatively strong due to the enhanced decarboxylation and demethoxylation reactions. Meanwhile, the fixed-bed co-pyrolysis experiment showed that the relative content of non-methoxy phenolics increased from 7.0 % to 10.6 % with bio-oil yield increasing from 27 % to 40 %, after adding 50 % SBC. Additionally, the interaction mechanism was proposed based on the TG-FTIR and fixed-bed pyrolysis experimental results. SBC served as a hydrogen donor to promote the thermal decomposition of lignin and improved the yields of phenol and alkylphenols. This work offers guidance for the synergistic conversion of renewable carbon sources with oily solid wastes.
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Journal of Cleaner Production
·
2022
·
IF 11.072
Minjie Hou,Leiming Wang,Yanning Sun,Yanzhu Guo,Xueru Sheng,Fengshan Zhang,Haidong Sun,Pedram Fatehi,Haiqiang Shi
Generally, lignin separation from prehydrolysis liquor (PHL) is accompanied by sugar removal, making the purification of PHL challenging. However, how sugar loss from PHL can be minimized in PHL purification is still unclear. In this work, a method for removing lignin from PHL was attested, which included treatments of PHL with poly aluminum chloride (PAC), activated carbon, and XAD-4 resin. The results exhibited that the PAC could form complexation with lignin facilitating lignin removal from PHL. At the PAC concentration of 15 mg/L, 10% of lignin was removed, while no significant sugar loss was observed. Subsequently, by treating PHL with activated carbon, 87% of the remaining lignin was removed from the PHL, while sugar loss was identified to be 14%. XAD-4 resin treatment could slightly improve the lignin removal from 87% to 92%. However, the XAD-4 was unselective in sugar removal and led to an increased sugar loss (from 14% to 37%). Interestingly, removing colloidal lignin by PAC benefited the subsequent activated carbon process for improving lignin removal. In other words, PAC removed not only colloidal lignin but also facilities lignin isolation (i.e., an increase from 81% to 87%) and prohibited sugar loss (a drop from 27% to 6%) in the subsequent activated carbon treatment.
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Food and Bioprocess Technology
·
2023
·Vol. 16
·期 7
·1525-1540
·
IF 5.6
Olonisakin Kehinde,Wen Aishi,He Suping,Lin Huiping,Tao Wen,Chen Shanwei,Lin Wensheng,Li Ran,Zhang Xin-xiang,Yang Wenbin
Poly (butylene adipate-co-terephthalate) (PBAT), a biodegradable polymer, is a promising material in the food packaging industry. Its high elongation at break, ease of processibility, and biodegradability make it a substitute for low-density polyethylene. But its use in food packaging is limited to its cost, low tensile strength, and barrier properties. Herein, using a green approach, we prepared PBAT composite film with epoxidized soya bean oil (ESO) and encapsulated lignin (Lig)/tannic acid (Ta) (ESO-Lig-Ta) as filler. Different amounts (1, 2, 3%) of ESO-Lig-Ta were added to the composite film, and the effect on the properties was studied. The result showed that the ESO-Lig-Ta improved the tensile strength by more than 100%, and scanning electron microscopy (SEM) revealed a homogenous dispersion of the encapsulated filler in the matrix. The ultraviolet (UV) transmission decreased with an increasing amount of ESO-Lig-Ta. There was a reduced water vapor and oxygen transmission rate due to ESO-Lig-Ta than the neat PBAT film. Food (fresh potato and onion) sealed with the composite film remained fresh for up to 12 days at room temperature. The biodegradation of the composite film resulted from hydrolysis C-O/C = O, as shown by attenuated total reflection–Fourier transform infrared spectra (ATR-FTIR). The composite film can be extensively applied in short-lived fresh food packaging and long-term preservation and packaging of dry food products. Graphical ESO-encapsulated lignin and tannic acid incorporated into PBAT film as a potential food packaging film for short-live fresh products and long-term storage of dry food products.
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