Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 46
·25356-25367
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IF 11.9
Ganggang Zhang,Chenchen Tian,Heying Chu,Jun Liu,Baochun Guo,Liqun Zhang
Reinforcement and cross-linking are two critical issues in the rubber industry. However, carbon black (CB) as the most dominant reinforcing filler is derived from fossil resource-derived chemicals. And currently adopted cross-linking strategies would result in difficulties in the recycling of end-of-life rubbers. Herein, lignin, the most abundant renewable aromatic polymer, was developed as an effective reinforcing filler of rubber. The butadiene–styrene–vinylpyridine rubber (VPR) was selected as the rubber matrix, and a facile and cost-effective strategy was provided to improve the compatibility and interfacial interaction between lignin and the non-polar rubber matrix. Based on the Zn2+–pyridine coordination between the pyridine groups in the VPR chains and phenoxy groups in the lignin molecules, the lignin particles could obtain fine dispersion in the rubber matrix, exhibiting an excellent reinforcing effect. Moreover, the pyridine groups in the VPR chains were developed as cross-linking points, and the VPR could be effectively cross-linked based on the chemical reaction between the pyridine group and alkyl halide, producing quaternized pyridine groups. Due to the existence of the exchange reaction via the C–N transalkylation of the quaternized pyridine groups, the lignin/VPR composites could show vitrimer-like properties and are endowed with good reprocessability at high temperatures. Additionally, due to the photothermal conversion capability of lignin, the lignin/VPR composites could exhibit good photothermal performance triggered by 808 nm near-infrared light, and further possess light-driven shape memory properties. Hence, we envisage that this work can provide an avenue to design and fabricate green, sustainable, and recyclable elastomer materials with lignin as a renewable bio-filler.
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Environmental Science-Nano
·
2023
·
IF 7.3
Hanchen Lin,Shanshan Li,Like Ning,Ning Ma,Peng Xu,Mei Hong,Fei Wang,Chaoqun You
The development of novel intelligent systems for controlling pesticide release has emerged as a crucial strategy in contemporary agriculture, aimed at enhancing the efficacy of pesticide application and mitigating environmental hazards. To address the technical bottleneck of low drug utilization rate in large-area spraying, a novel pesticide-controlled release system (NES@LCMs) with high adhesion and low-temperature responsiveness was developed by utilizing chitosan (CS) and methylcellulose (MC) as substrates, which were subsequently coated with lignin (LGN) to enhance the stability of the microspheres. The results showed that the drug-carrying microspheres based on natural polysaccharides can maintain a high deposition rate and avoid the degradation of pesticide molecules by sunlight. Meanwhile, the results of the release experiments demonstrated that NES@LCMs exhibited enhanced inhibitory effects under acidic and low-temperature conditions. The antifungal activity experiments demonstrated that the NES@LCMs exhibited a remarkable efficacy of 82.7% against Gibberella zeae (G. zeae), thereby enabling intelligent controlled release and extended control duration. The biosafety experiments demonstrated that the NES@LCMs nanoparticles significantly reduced the toxicity of NES towards organisms. Therefore, the pH and temperature dual-responsive NES@LCMs nanoparticles show promising potential for enhanced targeting efficacy and environmental safety.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yang Zhang,Zhenglei Li,Dongqing Yan,Hongxia Chen,Meng Zhang,Jun Wang,Guang Yang
In this work, Fe(II)/Peroxymonosulfate (PMS) treatment with dual functionality of pre-oxidation and coagulation was applied to enhance the removal of alkali lignin in water. The removal efficiency of alkali lignin (2 g/L) could reach ∼ 99% at an optimal dosage of [Fe(II)] = 2.4 mM and [PMS] = 7.8 mM, which was efficiently superior than that using ferric and polymeric coagulant individually. Pre-oxidation, involving hydroxyl radical (•OH) and sulfate radical (SO 4 •− ), has been demonstrated to play a crucial role in both oxidative degradation (∼30%) and reducing the molecular weight and hydrophilicity of lignin. Meanwhile, the formation of polynuclear Fe-hydroxide complexes was also fostered, which in turn greatly contribute to the removal of lignin through an enhanced coagulation mechanism. The reductive units present in alkali lignin was demonstrated to initiate a dynamic transition between Fe(III) and Fe(II) by donating electrons. This redox activity is anticipated to continuously promote the formation of electro-neutral and loose flocs, thereby resulting in an enhanced coagulation performance. Furthermore, ultrafiltration (UF) was also demonstrated as a viable liquid/solid separation method following Fe(II)/PMS treatment, effectively promoting membrane flux recovery rate to ∼90%. This highlights the remarkable potential of this method when combined with other treatment processes. This study aims to offer a complementary strategy for remediating alkali lignin wastewater while advancing the fundamental understanding of redox-reaction enhanced in-situ coagulation in water treatment applications.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Deyu Niu,Wenhao Yu,Weijun Yang,Pengwu Xu,Tianxi Liu,Zhenyu Wang,Xiuping Yan,Piming Ma
Poly(lactic acid) (PLA) is one of the most promising sustainable bioplastics for its superior processibility and mechanical strength. However, the inherent flammability and poor UV shielding severely inhibit its widespread application. Traditional solutions usually require a high content of additives, which results in the sacrifice of mechanical properties. In this work, we propose an efficient strategy to overcome these challenges by incorporating epoxy-functionalized hexa -cyclotriphosphazene (HCCP-HEP) and diphenylphosphinyl chloride modified lignin (Lignin(P)) into PLA. The synergistic effect of HCCP-HEP and Lignin(P) through free radical quenching, non-flammable gas dilution and charring promotion significantly impedes combustion and enhances the flame retardance of PLA/HCCP-HEP/Lignin(P) (PLA/H/L) composites. Consequently, the PLA/H/L composite with 1 wt% HCCP-HEP and 1 wt% Lignin(P) loading exhibits a limiting oxygen index of 28.3 % and achieves UL-94 V-0 rating. Moreover, the composite provides over 97 % shielding against UV-A and UV-B radiation with an increased ultraviolet protection factor (UPF) from 1 to 700, while maintaining superior tensile strength (59 MPa). This work presents a new approach to prepare high-performance and multi-functional PLA composites, which is expected to broaden the application of PLA.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Wenhao Yuan,Jie Zhou,Mingyue Jiang,Qingfeng Sun,Gaoyuan Ye,Xiaochun Zhang,Hongjie Bi
The development and comparison of latent fingerprint (LFP) are crucial for the detection and identification of LFP. However, research on stable, clear, and no background interference’s fluorescent materials for LFP recognition are scarce. In this study, lignin-derived carbon dots (CDs) with orange red emission were synthesized and combined with polyvinyl alcohol (PVA) matrix for identification of LFP and ink-free printing. The physicochemical and microstructure of the CDs and CDs/PVA nanocomposite have been precisely elucidated by TEM , FT-IR, XPS , SEM , and TGA to verify the reaction of CDs with PVA forming hydrogen bonds. The effect of CDs on the mechanical properties of PVA nanocomposite was studied. The tensile strength and elongation at break of PVA nanocomposite were increased by 113.01 % and 175.26 %, respectively. The shape memory and fluorescence properties of CDs/PVA nanocomposite were studied under different conditions such as water, acid, alkali and heat. The fluorescence intensity of CDs/PVA nanocomposites was enhanced due to the deprotonation of CDs surface under alkaline conditions. By coating CDs/PVA solution on LFP, a stable fluorescent fingerprint with clear ridge details was formed on the composite film, and it is applied to letterpress printing and gravure printing, enabling personal identification and ink-free printing. Obviously, the nanocomposite film prepared herein has multiple functions, providing potential for the design and manufacture of advanced all-round personal information identification and encryption applications in extremely harsh high temperature and strong alkaline environments.
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JOURNAL OF THE ENERGY INSTITUTE
·
2023
·
IF 5.7
Han-Bing Gao,Yun-Peng Zhao,Bing-Hu Xie,Le-Le Qiu,Jian Xiao,Jing Liang,Jian Li,Fang-Jing Liu,Yue-Lun Wang,Jing-Pei Cao
Selective hydrogenolysis of C–O bonds in lignin is regarded as an important process to produce high value-added chemicals and biofuels. Herein, high-performance Ru-based catalysts (Ru/AC) supported on activated carbon (AC) derived from corncob waste were prepared by a simple impregnation method. The optimal 5%Ru/AC possessed enormous specific surface area, well-developed porosity, high metal dispersion, small Ru particle size and strong metal-support interaction, showing a marvelous catalytic performance in the hydrogenolysis of diphenyl ether, benzyl phenyl ether and phenylethyl phenyl ether with different kinds of C–O bonds under mild conditions. Besides, various phenolic compounds were selectively hydrogenated into cycloalkanols and cycloalkanes over 5%Ru/AC, indicating the excellent catalytic activity in aromatic ring hydrogenation of this catalyst. In addition, high conversion of diphenyl ether and high selectivity of monomeric products were well maintained after employing this catalyst at least three times. The construction and application of the ingenious 5%Ru/AC catalyst highlighted a promising approach to the value-added utilization of lignin-derived aromatic compounds.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Hong Guo,Yaohua Liu,Yuancai Lv,Yifan Liu,Yunzhi Lin,Minghua Liu
A new nitrogen doped sinocalamus oldhami lignin-based activated biochar (denoted as N-BGAC) with a notably high adsorption efficiency was prepared for the removal of malachite green (MG). The properties and structure of N-BGAC were thoroughly characterized, alongside an investigation into the MG adsorption process . The findings revealed that N-BGAC possessed a substantial specific surface area of 2238 m 2 g −1 , nearly double that of the activated biochar lacking nitrogen doping (BGAC). Additionally, N-BGAC exhibited exceptional adsorption efficiency for MG, boasting a maximum adsorption capacity of 1372.5 mg g −1 , marking an enhancement of nearly 2.5 times compared to BGAC. By exploring the adsorption mechanism, it could be found that the adsorption process was a spontaneous exothermic reaction , and mainly controlled by pore-filling effect, electrostatic interactions, hydrogen bonding, hydrophobic interactions and π-π bonding interactions. Crucially, in the regeneration experiments, the removal percentage of MG could still reach 81.5% after four cycles of regeneration, making it promising in the contaminant removal .
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GREEN CHEMISTRY
·
2023
·Vol. 26
·期 3
·1488-1500
·
IF 9.8
Changzhou Chen,Xialin Ji,Yongzhi Xiong,Jianchun Jiang
Biomass appears to be a potential candidate for the preparation of porous carbon materials with wide applications for catalytic fields due to its low price, green sustainability and natural hierarchical porous structure. Here, we designed a novel NixCuy/BC catalyst with a unique hollow sphere structure derived from a biomass puffball, which exhibited a superior catalytic transfer hydrodeoxygenation of VAN to value-added MMP products with an ∼100% vanillin (VAN) conversion and over 88% selectivity of 2-methoxy-4-methylphenol (MMP) products in the absence of additional hydrogen. The good catalytic activity performance of the NixCuy/BC catalysts was attributed to the NiCu alloy with a unique hollow sphere structure, high dispersion and electron transfer. Density functional theory (DFT) calculation results also indicated NiCu alloy as the main catalytic sites. This work not only provided a cheap and efficient hydrodeoxygenation catalyst for VAN hydrodeoxygenation, but also offered new insights for designing novel and unique biomass-based carbon materials for biomass utilizations or other widespread applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Jing Tian,Jingqian Chen,Jiaqi Guo,Wenyuan Zhu,Mohammad Rizwan Khan,Qingquan Fu,Yongcan Jin,Huining Xiao,Junlong Song,Orlando J. Rojas
We introduce Kraft lignin colloids produced by destabilization of a kraft lignin solution by pH shift from 2 to 11. The system includes lignin particles and hydrocolloid aggregates in equilibrium (KLP), which are used to control the emulsifying energy and to stabilize oil-in-water emulsions under high energy at pH 11 and 7, yielding excellent stability (at least three months with no creaming). We investigate emulsify technology (ultrasonication and homogenization), energy input (high energy or low energy), particle desorption, drop size, and rheology on the stability of KLP-based Pickering emulsions according to the system’s pH. The ultrasonication leads to fine, stable and homogenous lignin emulsions without observing macroscopic creaming phenomenon, whereas homogenization only limits to alkaline condition. Regarding homogenization process, increasing the energy input helps to reduce the emulsion droplet size and consequently improves emulsion stability. In addition, the emulsion produced at acidic conditions always presented excellent stability, independent of the emulsify parameters. Considering the synergistic effects of emulsification protocol, surface activity, and particle interactions, the results indicate the possibility of extending the applications of kraft lignin as a Pickering stabilizer in neutral and alkaline conditions. It also creates a promising method to control the stability and emulsion microstructure in the industrial KLP based emulsion preparation process.
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Polymers
·
2023
·Vol. 15
·期 13
·2806
·
IF 5
Haichuan Ye,Yuan He,Haichao Li,Tingting You,Feng Xu
Three-dimensional (3D) printing is regarded as a novel technique to realize the customized production of films. However, the relative lack of printable materials with excellent mechanical properties and tailored functionalities seriously restricts its wide application. Herein, a promising multifunctional 3D printing filament was fabricated by incorporating lignin into the polylactic acid (PLA) matrix and firstly applied to film production. The results indicate that lignin was an excellent mechanical reinforcement of the PLA matrix, especially for toughening. Only 0.5% lignin doping improved the toughness by 81.8%. Additionally, 3D-printed films with 0.5–5% lignin exhibited excellent ultraviolet (UV)-blocking capability of 87.4–99.9% for UVB and 65.6–99.8% for UVA, as well as remarkable antioxidant properties, ranging from 24.0% to 79.0%, and high levels of haze, ranging from 63.5% to 92.5%. Moreover, the prepared PLA/lignin (P/L) films based on 3D printing achieved the customization of film production and have potential applications in the fields of packaging, electronic products, medical care, and so forth. Overall, this work not only enriches the 3D printing composites with tailored multifunctionality but also brings the promising potential for the production of customized films.
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PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Jiantao Su,Haihong Xia,Fei Ge,Xiaohui Yang,Minghao Zhou,Jianchun Jiang
5-Hydroxymethylfurfural (HMF) is a very important chemical intermediate, while it can be hydrogenated into various value-added chemicals. However, the hydrogenation of HMF over non-precious metal catalysts still remains as a challenging problem. In this study, lignosulfonate (LS) was used as carbon resource, and successfully introduced into MOFs structure. Then, a series of lignin-MOF derived catalysts (Ni n Co-MOF-LS) were prepared by the hydrothermal method with different ratios of Ni and Co metals. The selective conversion of hydroxymethylfurfural (HMF) to 5-methylfurfuryl alcohol (MFA) was achieved over Ni n Co-MOF-LS catalyst in a N 2 atmosphere with isopropanol as solvent. The Ni/Co metal ratios and calcination temperature played a key role in the catalytic performance of the catalyst. The catalysts showed good catalytic performance in the selective hydrogenation of HMF to MFA through an in-depth study of various reaction parameters such as temperature, pressure, reaction time and catalyst dosage. The coordination of lignosulfonate and MOFs provide a novel alternative for the utilization of lignin resource and the upgrading of biomass-derived chemicals.
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ACS Catalysis
·
2023
·
IF 12.9
Jie Li,Zhen Li,Jing Dong,Renbo Fang,Yingnan Chi,Changwen Hu
The targeting cleavage of lignin into value-added aromatic monomers has attracted increasing attention. Although the base-catalyzed depolymerization of lignin has been developed, the use of excess corrosive bases and their poor recyclability limit their industrial implementation. Herein, a catalytic amount of solid base K7HNb6O19 (KNb6) coupled with copper-modified graphitic carbon nitride (Cu/C3N4) shows enhanced catalytic performance for the oxidative cleavage of β-O-4 lignin linkages using molecular oxygen. Due to the synergetic effect between KNb6 and Cu/C3N4, 96% of the β-O-4 ketone model was converted under relatively mild conditions, and phenol (yield: 90%) and other aromatic monomers (yield: 90%) were obtained. Moreover, KNb6–Cu/C3N4 is robust, and its catalytic activity is basically maintained after five cycles. Experimental and theoretical studies (spectroscopic analysis, control experiments, kinetic study, density functional theory calculations, etc.) reveal that the surface basic O atoms of KNb6 can simultaneously activate the Cβ–H bond of β-O-4 ketone to promote the insertion of molecular oxygen, and subsequently, Cu/C3N4 catalyzes the selective cleavage of the Cα–Cβ bond. The catalysts were also active for the oxidative cleavages of other lignin models and oxidized organosolv lignin.
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危险品化学品经营许可证（带存储）