Journal of Biomedical Nanotechnology
·
2018
·Vol. 14
·期 9
·1543-1555
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IF 5.068
Li Yanpeng,Ren Junli,Sun Runcang,Wang Xiaohui
A sensitive and reversible sensing platform based on fluorescent carbon dots (CDs) allowing capture and detection of metal ions is of significance for developing diagnostic probes and in-situ environmental-monitoring. Here, a simple and effective method for converting biomass
lignin into fluorescent CDs is developed. The obtained CDs, with stable fluorescence and excellent water solubility, are fabricated as unique model biosensors to access the metal-induced quenching mechanism. It is demonstrated that selective fluorescence quenching behaviors of lignin CDs are
firstly found related to the valence-state of metal ions. Moreover, a reversible control of CDs fluorescence is realized by introducing reducing agents. This novel biosensor and the approach to quenching mechanism may evoke new insight in designing ions-sensor and monitoring biologic redox
signal.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Huiqi Jin,Haiqiang Shi,Wenchao Jia,Yanning Sun,Xueru Sheng,Yanzhu Guo,Haiming Li,Haidong Sun
The molecular weight is one of the most important factors influencing the utilization of industrial lignin obtained from chemical pulping process. In this paper, a facile operative green solvent system was successfully developed for molecular weight-controllable fractionation of industrial alkali lignin (IAL) at room temperature. The results showed that through adjusting the ratio of water, ethanol and γ-Valerolactone (GVL), the industrial lignin was fractionated into six levels with molecular weight stepwise controllable from low to high. The fractionation is a physical process according to FTIR and 2D-HSQC NMR analysis, and the chemical structure of lignin has not changed. Additionally, the polydispersity of fractionated lignin with higher molecular weight tends to be narrower. The content of hydroxyl and carboxyl group is higher for the fractionated lignin with lower molecular weight, which would be beneficial for the chemical reactivity in the down-stream application.
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ACS Sustainable Chemistry & Engineering
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2015
·
IF 4.642
Ruihua Li,Baoyu Gao,Shenglei Sun,Qinyan Yue,Meng Li,Xudan Yang,Wuchang Song,Ruibao Jia
In this study, a lignin-based flocculant (LNF) was synthesized by grafting amine groups into alkali lignin containing papermaking sludge. Characterization of LNF, such as FTIR, zeta potential, cationic degree, viscosity, and molecular weight, showed that the product was a cationic polymer with high solubility. LNF was used with aluminum sulfate (AS) and polyaluminum chloride (PAC) in humic acid coagulation to demonstrate its efficiency. Coagulation behavior and floc properties of LNF+PAC and LNF+AS dual-coagulant were comparatively evaluated. Results showed that the coagulation aid effect of LNF was independent of aluminum species. Addition of LNF could enhance humic acid removal efficiency and floc properties including size, strength, and fractal dimension significantly. The effect of solution pH on coagulation processes was also studied. Dual-coagulants showed the same variation trend as that of aluminum-based coagulants but enhanced coagulation performance during the investigative pH range. Flocs formed at pH 9 and pH 5 achieved maximum floc size in AS and PAC coagulation systems, respectively. Fractal dimension was relatively high at pH 7–9 due to the sweeping effect of aluminum hydrolysates. Overall, LNF brought in charge neutralization and absorption bridging effect and played a positive role in coagulation processes.
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ChemistryOpen
·
2019
·Vol. 8
·期 5
·643-649
·
IF 2.205
Boyu Du,Bingyang Liu,Xing Wang,Jinghui Zhou
Graphical Lignin explained : Phosphotungstic acid polyoxometalate catalyst showed high activity in the selective depolymerization of three types of lignin samples to phenolic monomers, and the impact of the structure differences on the distribution of phenolic monomers were well studied. Emphasis was placed on changing the types of lignin samples to control the secondary depolymerization of methoxy groups and greatly improving the selectivity of phenolic monomers. Herein we studied the chemical structure of different types of lignin samples and the potential to prepare phenolic monomers was illustrated by phosphotungstic acid catalysts. Different types of H/G/S lignin components had different structures. The lignin extracted from poplar had the highest molecular weight and β-O-4 aryl ether contents, followed by pine and straw lignin samples. After depolymerization by PTA catalyst, the yields of phenolic monomers detected was 8.06 wt % (poplar), 5.44 wt % (pine) and 4.52 wt % (straw), respectively. Further, the ratios of H/G/S in the phenol monomers were also different, indicating that the S, G and H types structural units were continuously transformed with each other during the reaction. In our study, the change in the types of lignin samples resulted into an improvement of the distribution of phenolic products, and also the selectivity of phenolic monomers significantly.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Afroza Akter Liza,Shihao Wang,Yanchen Zhu,Hao Wu,Lukuan Guo,Yungeng Qi,Fengshan Zhang,Junlong Song,Hao Ren,Jiaqi Guo
This study aimed to explore the synergistic mechanism of lignin chromophore modifications via UV treatment and to analyze the effects of mechanical treatments on LCNF properties for future uses. The procedure involved two steps: first, lignin's chromophore modification via UV illumination, and then the ball milling process was proceeded for 1 h, followed by high-intensity ultrasonic for 15–135 min. Characterization included preserved lignin content percentage, FTIR, UV–vis NMR, and color analysis for UV-modified samples, and to access the influence of mechanical treatment on LCNF samples further yield, zeta potential analysis, XRD, thermogravimetric analysis, atomic force microscopy, and scanning electron microscopy were performed. LCNFs S-120 demonstrated a zeta potential of −21.7 mV, indicating enhanced stability compared to the S-135 sample (−10.95 mV). The S-120 sample also showed the highest yield (74.02 %) and TGA at 391 °C. In XRD analysis, the S-120 sample demonstrated the highest CrI 64.3 %, than the S-15 sample (48.2 %). Preserved lignin in the LCNFs led to a slight reduction in crystallinity across all samples but improved thermal stability for all the prepared LCNFs samples. The UV and ultrasonication improved the homogeneity and durability of the LCNF samples, enabling a process that may be used to industries.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Rui Lou,Taoyuan Niu,Fengyu Zhao,Long He,Yuejin Yuan,Guodong Wei,Gaojin Lyu
Lignin as a natural biopolymer is becoming increasingly in demand due to its eco-friendly properties, while lignin-based electrolyte with high conductivity and reliable durability for applications in supercapacitors is still challenging. Herein, a facile method to prepare lignin nanoparticles (LNPs)-based solid electrolyte thin film (LF) was proposed through chemical cross-linking reaction. The fabricated LF exhibited a distinctive spongy porous structure with the ionic conductivity of 3.26 mS cm −1 , demonstrating the exceptional flexibility and favorable mechanical properties. Moreover, the assembly of all-LNPs-based symmetric supercapacitor (SSC) devices was achieved using LF electrolyte and LCA electrodes for the first time, confirming the LF3 electrolyte superior to commercial cellulose separator in capacitive behaviour. This SSC device exhibited a specific capacitance of 122.7 F g −1 at 0.5 A g −1 and the maximum energy density of 17.04 W h kg −1 . Furthermore, the incorporation of sodium alginate (SA) significantly enhanced the ionic conductivity of SA/LF3 electrolyte, and the resulting SSC device delivered a higher specific capacitance of 174.5 F g −1 at 0.5 A g −1 and the maximum energy and power densities of 24.24 W h kg −1 and 5023 W kg −1 , respectively. This study proposes a promising approach for sustainable utilization of lignin in energy storage applications.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Xueqian Li,Junying Li,Xiaoying Shen,Mengyao Cao,Yu Wang,Wansong Zhang,Yanglei Xu,Zhe Ling,Sheng Chen,Feng Xu
Light-management films that can control solar transmission through themselves, especially those based on renewable and biodegradable materials, are significant for diverse photon-related applications such as energy-efficient buildings, photovoltaics, and optoelectronic devices. Herein, composite transparent films with adjustable haze and UV-blocking capabilities are developed based on the main components of lignocellulosic biomass (cellulose and lignin), and their promising applications in light management are also demonstrated. Carboxymethyl cellulose (CMC) with a good film-forming property is used as the substrate matrix, and cellulose nanocrystals (CNC) with a nanoscale rod-like shape are used as functional fillers. The obtained CMC–CNC composite films exhibit adjustable optical properties (high transparency of >90% and haze of 3.17–13%) and surprisingly enhanced mechanical strength and thermal stability when compared with pure CMC films. Furthermore, lignosulfonates (LS), as industrial lignin products, are combined to endow the CMC–CNC–LS composite films with excellent UV-shielding performance (98.17% UVB and 89.38% UVA), but they well maintain the high transparency and haze. We demonstrate that the composite films are able to avoid color changes of UV test cards by shielding UV light and that they achieve uniform illumination when light transmits through, indicating their promising potential for practical applications in light management. In addition, the effect of CNC and LS contents on the morphological, chemical, mechanical, and thermal properties of composite films is investigated. Our work provides novel insights into the fabrication of sustainable light-management films based on lignocellulose-derived materials by tuning their light-scattering and light-absorbing properties.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Nian Chen,Weifeng Liu,Jinhao Huang,Xueqing Qiu
High efficiency lignin-grafted cationic polyacrylamide (L-CPA) flocculant was synthesized via “grafting to” method using acrylamide (AM), methylacryloyloxyethyltrimethyl ammonium chloride (DMC) and enzymatic hydrolysis lignin (EHL) as raw materials. The linear pre-polymer of cationic polyacrylamide (CPA) terminated with chlorine was first synthesized and then grafted onto EHL via reactions of chlorine with phenolic hydroxyl groups in lignin molecules. The synthesized L-CPA could self-assemble into octopus-like nanospheres with CPA segments dissolved in water and hydrophobic lignin skeletons concentrated in the core, which endowed the L-CPA with excellent flocculation efficiency for kaolin suspension under faintly acid, neutral or alkalescent conditions (pH = 5–9). Only a small dosage between 4.0–4.5 mg/L of L-CPA was needed for flocculation of the kaolin suspension. The charge neutralization and bridging effect was proposed for the flocculation mechanism of the lignin-grafted cationic polyacrylamide. The octopus-like L-CPA was cheap, environmentally friendly and technically feasible, showing a great prospect in wastewater treatment.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xu Fu,Ling-Ping Xiao,Bo-Wen Meng,Wen-Jie Li,Run-Cang Sun
Utilizing industrial lignin, which has the features of high yield and low added value, as a raw material for dye dispersants can produce significant environmental benefits and promote the sustainable development of resources. Ingeniously, we investigated the mechanochemical method to enhance effect in microwave-assisted sulfonation and the preparation of lignin-based dye dispersant using epichlorohydrin cross-linking. The results showed that lignin ball milling with Na 2 SO 3 could significantly increase the amount of C–O active structures and enhance its sulfonation reactivity. Under a lignin/Na 2 SO 3 ratio of 1:1, the charge density of the sulfonated lignin (milled lignosulfonate, MLS) achieved through microwave-assisted sulfomethylation up to 1.87 meq/g. Notably, the charge density of lignosulfonate (milled epichlorohydrin-cross-linked lignosulfonate, MELS) obtained by cross-linking with epichlorohydrin reached 1.91 meq/g with a degree of substitution of 1.45 mmol/g and molecular weight of 10530 g/mol. As compared with two commercial lignosulfonates and MLS, MELS displayed the greatest dispersion stability, increased the dyeing rate and K/S λmax value of dyed fiber while reducing staining. This work paved a new avenue for lignin valorization and provided new insights into the fabrication of lignin-derived dye dispersant.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhiqiang Qi,Hongzhen Cai,Xiangsheng Han,Zhihao Duan,Jingting Jin,Shunyi Zhang,Keyan Yang,Jiankang Zhang,Wenzhi Li
Constructing lignin-based nano-adsorbents with modulated surface polarity demonstrates promising efficiency, sustainability and biocompatibility in the application of Pb 2+ removal, nevertheless, which is hard to achieve. Here, a delicately designed assembly process of amphiphilic lignin was performed on the surfaces of aramid nanofibers (ANF), and a fibrous nano-hybrid (ANF@L x ) with uniform sheet-like lignin aggregations on ANF was obtained. Ascribing to the dominated π-π stacking between benzene rings on ANF and lignin, the H-bond between them weakened relatively, and more oxygen containing polar groups on lignin were exposed. Combining the advantages of fibrous morphology and active surfaces, the ANF@L x exhibited favorable processibility that can be molded into membranes and aerogels with different scales and shapes, and conducive adsorption capacity (∼587.8 mg/g), kinetic (achieve equilibrium within 1 min) and selectivity toward Pb 2+ in contaminated water resources. Thus, this work paved a green, simple and energy efficient way to modulate the assembly of lignin in micro-nano interfaces, and construct lignin-based nano-adsorbents with both of high Pb 2+ removal efficiency and promising industrial application potential.
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AQUATIC TOXICOLOGY
·
2015
·
IF 3.451
Dan Li,Qin Chen,Jinling Cao,Hongxing Chen,Lixia Li,Nina Cedergreen,Haibo Xie,Lingtian Xie
One of the ultimate goals of green chemistry is to produce greener and more environmentally friendly chemicals to replace the existing toxic chemicals. In this study, Japanese medaka were exposed to 1.5 mg/L of bisphenol A or lignin-derived bisphenol for 60 days, and the expressions of various biochemical markers, effects on reproduction, and histopathology were evaluated. The results showed that concentrations of liver vitellogenin of LD-BP exposed males were approximately 125% higher compared to the control males. Total number of eggs from the BPA and LD-BP exposed fish was approximately 47% ( p < 0.001) and 25% ( p < 0.05) less than the control fish, respectively. Total number of brood was lower from the BPA (46%, p < 0.05) and LD-BP (17%, p < 0.05) exposed fish than that of the control fish. Relative to the control fish, catalase and glutathione- S -transferase were significantly affected by the two chemicals in all tested tissues. BPA and LD-BP caused lipid peroxidation in all the tested tissues. Furthermore, acetylcholinesterase and α-glucosidase activity were significantly inhibited. Histopathological analysis showed that both the testis and ovary were mildly damaged by both chemicals. LD-BP affected medaka slightly more severe than BPA except on the reproduction, which was most likely due to different uptake, translocation, binding to targets and metabolism. Our results demonstrated that chronic exposure to both chemicals caused several adverse effects to medaka. Further research on the toxicity of LD-BP to other aquatic organisms is needed before substitution of traditional BPA with LD-BP can be recommended.
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COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Yufei Liu,Shan Liu,Zhentao Liu,Yang Lei,Siyuan Jiang,Kai Zhang,Wei Yan,Jun Qin,Min He,Shuhao Qin,Jie Yu
Biodegradable polymers , including polybutylene adipate-co-terephthalate (PBAT), can replace traditional plastics to effectively target microplastic pollution; however, their high cost limits their application. In this study, vinyltrimethoxysilane (VTMS)-grafted lignin (VL) was prepared and incorporated into PBAT to reduce its cost and improve its mechanical properties while maintaining its biodegradability. Results show that the tensile strength , Young's modulus , and biodegradation efficiency of a PBAT/VL-30% composite increased by 200%, 151%, and 96%, respectively, compared with neat PBAT. VTMS grafting onto lignin thus improves the dispersion of lignin in PBAT; a network structure of PBAT and VL is formed via reactive extrusion . This work provides a theoretical basis for the design and development of low-cost, highly biodegradable PBAT composites.
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