INDUSTRIAL CROPS AND PRODUCTS
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2026
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IF 6.4
Wendi Fang,Naixin Kang,Le Huang,Guiying Dai,Xueting Fei,Hongxu Liang,Hongxiang Hu
The reduction and precipitation of Cr during the adsorption process has always been challenging. In this study, S and N codoped lignin-based porous carbon (SN-LPC) was prepared by hydrothermal treatment and K-intercalation activation for the removal of Cr(VI). We discovered that SN-LPC has a new mechanism underlying the adsorption–reduction–readsorption of Cr(VI): First, SN-LPC adsorbs Cr(VI) onto its surface through the hydrogen bonding of -OH and the electrostatic adsorption of N functional group protonation; second, the S and N functional groups act as electron donors to induce the rapid reduction of Cr(VI) to Cr(III). Last, the –C–OR/C N groups on the SN-LPC surface and the S and N functional groups adsorb Cr(III) again, increasing the removal of Cr(VI). DFT calculations have revealed at the molecular structure level that SN-LPC has a more active electronic nature. Doping of S and N increases the affinity of SN-LPC for chromium, which explains why it can efficiently reduce and fix Cr(VI) and adsorb Cr(III). The removal process of Cr(VI) by SN-LPC is mainly multilayer adsorption dominated by chemical adsorption, with a maximum adsorption capacity of 967.45 mg/g (pH 2, 45 °C, and an initial concentration of 800 mg/L), and the removal efficiency is much greater than that of similar activated carbon and biochar. The 2D-FTIR–COS results further elucidated the sequence of functional groups of SN-LPC in the process of reducing Cr(VI), supporting the mechanism hypothesis of adsorption–reduction–readsorption. These findings highlight the significance of sulfur and nitrogen as key groups in reduction and adsorption and provide a reference for the underlying synergistic adsorption reduction mechanism used to repair Cr(VI).
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DOI
高影响因子
Journal of Water Process Engineering
·
2022
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IF 7.34
Yunfen Shi,Yinyan Zhong,Zhong Sun,Xiaozhen Ma,Shuqi Li,Fan Wang,Yupeng An,Qing Luo,Jin Zhu,Jing Chen,Ning Yan
Taking effective measures to remove oil and organic pollutants from water has become a top priority. In this study, we developed a novel superhydrophobic and magnetic lignin-based polyurethane foam for highly efficient adsorption of organic pollutants and removal of viscous crude oil from water. The superhydrophobic bio-based magnetic foam was prepared by the addition of Fe 3 O 4 nanoparticles during the foaming process followed by the immersion in an octadecyltrimethoxysilane (OTMS) solution. After modification by OTMS, the water contact angle (WCA) of the foam adsorbent was increased by 37.1°, exhibiting a high WCA of 156°. Fe 3 O 4 nanoparticles endowed the foam with excellent photo-thermal performance, allowing the efficient adsorption of both crude oil and a wide range of organic solvents. The foam adsorbent had a high adsorption capacity up to 18.8 times of its own weight. The bio-based adsorbent could still retain a high adsorption capacity after over ten cycles. The magnetic property facilitated control and recycling of the foam adsorbent by using a magnetic field. Moreover, the bio-based foam adsorbent was fully degraded in a methanol/sodium hydroxide solution (0.5 mol/L) at 60 °C after 8 h. The outstanding mechanical stability, reusability, and environmental friendliness make these bio-based foam adsorbent highly promising for cleaning up pollutions in water.
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FUEL
·
2020
·
IF 5.578
Riyang Shu,Rongxuan Li,Biqin Lin,Bowen Luo,Zhipeng Tian
Metal particle size and metal dispersion significantly influence the catalyst activity, and an efficient catalytic upgrade of bio-oil to high-quality liquid fuel is always difficult. Herein, a high dispersed Ru/SiO 2 -ZrO 2 catalyst was prepared by polyol reduction method, which exhibited a high catalytic activity on hydrodeoxygenation (HDO) of the phenolic compounds and pyrolysis lignin-oil. As a model compound, guaiacol had a conversion of 99.9% and a cyclohexane selectivity of 96.7% at the temperature of 240 °C. This polyol Ru/SiO 2 -ZrO 2 catalyst had a good recyclability in the guaiacol HDO. No significant decrease on the catalytic activity was presented after continuous 5 runs, and the conversion kept close to 100% and the selectivity of cyclohexane kept above 88%. Several common phenolic compounds also enabled to be turned into corresponding cycloalkanes efficiently. The high Ru dispersion and the large amount of strong acid sites in the polyol Ru/SiO 2 -ZrO 2 are the main reasons for the good catalytic performances. The synergetic effects between high dispersed metal site and strong acid site lead to a promoted efficiency in the HDO process to form the cycloalkanes. This active catalyst was also applicable to the upgrade of pyrolysis lignin-oil. After reaction, the content of hydrocarbons in the lignin-oil increased from 16.2% to 86.1%, and guaiacols and other oxygenated compounds were almost disappeared. The upgraded lignin-oil has potential to be used as high-quality fuels directly.
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RENEWABLE ENERGY
·
2020
·
IF 6.274
Yanliang Song,Hairui Ji,Xiaoyou Shi,Xue Yang,Xu Zhang
Deep eutectic solvent (DES) treatment emerged as an efficient way to separate lignin at a moderate condition via acidolysis and hydrophobic interaction . In the attempt to realize lignin’s upgrading, this work employs successive organic solvent fractionation in DES-extracted lignin to obtain fragments with a narrow molecular weight distribution and relatively homogeneous structure. The polydispersity was decreased from 2.26 to 1.35. Purity and thermal stability were enhanced. Ethyl acetate-extracted lignin possessed the highest content of phenolic hydroxyls (3.23 mmol/g) but the lowest content of aliphatic hydroxyls of 1.10 mmol/g β-O-4 linkages were partly cleaved during DES separation and fragments containing more C–C bonds tended to be dissolved in ethyl acetate through hydrophobic interaction . The successive fractionation performed effectively in obtaining lignin fragments with diversity in main linkages and functional groups. This approach provided lignin fractions with versatility in preparation and application in thermos-plastics, lignin-derived carbon materials, antioxidants and aromatic fuels and chemicals.
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高影响因子
FUEL
·
2020
·
IF 5.578
Tianjin Li,Hongfei Lin,Xinping Ouyang,Xueqing Qiu,Zechen Wan,Tao Ruan
The selective cleavage of C–O bond in lignin is the key to convert them into aromatic compounds and then to produce liquid fuels and chemicals. N-doped carbon nanosheets were obtained by direct pyrolysis of glucosamine hydrochloride (GAH) and melamine. Highly-dispersed and small-sized Ru nanoparticles (NPs) supported N-doped carbon by impregnation method, which can efficiently convert lignin to obtain 40.70% aromatic monomers. It was 2.3 times than that of the commercial catalyst (Ru/C) and the catalyst could be used at least five runs with an insignificant loss in the yield of aromatic monomers. The morphology, specific surface area, nitrogen species and content of supports could be tuned by controlling the weight of melamine. The results showed that the melamine and GAH were condensed to form layered graphitic carbon nitride (g-C 3 N 4 ) and a carbon skeleton at 600 °C, respectively. Then, the produced N from the decomposition of g-C 3 N 4 at high temperature (>700 °C) could improve nitrogen concentration, increase the specific area and result in the graphene-like wrinkled morphology. The presence of pyridinic N not only served as metal coordination sites to stabilize and disperse Ru NPs but also enhanced the proportions of Ru 0 through the electronic interactions. The DFT calculations implied that the pyridinic N contributed to the highest adsorption energy for 2-phenoxy-1-phenethanol (PPE) and a reduction of the disassociation energy for C alkyl –O bond compared with graphite N and pure C.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 10
·2239-2249
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IF 2.578
Qiling Zong,Ailing Xu,Kun Chai,Yanhua Zhang,Yongming Song
Green and renewable foaming poly(lactic acid) (PLA) represents one of the promising developments in PLA materials. This study is the first to use the lignin graft PLA copolymer (LG-g-PLA) to improve the foamability of PLA as a biobased nucleating agent. This agent was synthesized via ring-opening polymerization of lignin and lactide. The effects of LG-g-PLA on cell nucleation induced by the crystallization, rheological behavior, and foamability of PLA were evaluated. Results indicated that LG-g-PLA can improve the crystallization rate and crystallinity of PLA, and play a significant nucleation role in the microcellular foam processing of PLA. LG-g-PLA improved the foam morphology of PLA, obtaining a reduced and uniform cell size as well as increased expansion ratio and cell density. With the addition of 3 wt% LG-g-PLA content, the PLA/LG-g-PLA foams increased the compressive strength 1.6 times than that of neat PLA foams. The improved foaming properties of PLA via a biobased nucleating agent show potential for the production and application of green biodegradable foams.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
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IF 5.6
Haowen Cui,Xu Zhang,Haian Xia
Currently, the conversion of lignocellulosic biomass into furfural using deep eutectic solvents (DES) as the solvent and catalyst has many shortcomings including low furfural yields and inefficient resource utilization. To address these issues, a novel effective DES-methyl isobutyl ketone (DES-MIBK) reaction system was designed and used to catalyze the transformation of wheat straw to furfural and separate/recover cellulose and lignin in this work. The results showed that the DES-MIBK system could significantly improve furfural yield of up to 76.2 % at a mild condition (at 100 °C for 60 min). Furthermore, cellulose and lignin were fractionated and recovered from the reaction residues and the lignin yield reached 68.7 %. Moreover, the recovered cellulose exhibits high crystallinity (CrI=67.7 %). and the obtained lignin also has good uniformity with a small polydispersity index (PDI=2.36), and the results of FT-IR and 2 D NMR indicated that the obtained lignin retains its fundamental structure. This research highlights that the innovative DES-MIBK system has a high-efficient in the production of furfural and the recovery of lignin and cellulose, which could provide a novel strategy for the high-value and sustainable application of lignocellulose biomass.
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高影响因子
ENVIRONMENTAL POLLUTION
·
2024
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IF 7.6
Hiba Shaghaleh,Yousef Alhaj Hamoud,Qin Sun
Hydrogel adsorbents are promising tools for reducing heavy metals' bioavailability in contaminated soil. However, their practical feasibility remains limited by the low stability, inefficient removal efficiency, and potential secondary pollution. Optimizing the adsorption operation and the functional properties of hydrogel adsorbents could eliminate this method's drawbacks. Herein, three innovative in-situ remediation strategies for Pb/Cu-contaminated soil were adopted based on the concept of novel TEMPO-cellulose (TO-NFCs)/lignin/acrylamide@MIL-100(Fe) nanocomposite hydrogel adsorbent (NCLMH). Characteristic analyses revealed ideal Pb/Cu adsorption mechanisms by swelling, complexation, electrical attraction, and ion exchange via carboxyl/hydroxyl/carbonyl groups and unsaturated Fe(III) sites on ANCMH besides FeOOH formation. The highest maximum theoretical adsorption capacities of Pb(II) and Cu(II) on ANCMH were 416.39 and 133.98 mg/g, under pH 6.5, governed by pseudo-second-order/Freundlich models. Greenhouse pot experiments with contaminated soils amended with two-depth layers of 0.5% NCLMHs (SA@NCLMH) displayed a decline in Pb and Cu bioavailability up to 85.9% and 74.5% within 45 d. Soil column studies simulating continuous water soil flushing coupled with NCLMH layers, instead of conventional extractant fluids, and connected to NCLMH-sand column as purification unit (CF@NCLMH) achieved higher removal rates for Pb, and Cu of 89.5% and 77.2% within 24 h. Alternatively, conducting multiple-pulse soil flushing mode (MF@NCLMH) gained the highest Pb and Cu removal of 96.5% and 85.4%, as the water flushing-stop flux events allowed adequate water movement/residence period, promoting Pb/Cu desorption-adsorption from soil to NCLMH. Also, the NCLMH-sand column conducting and easy separation of the stable/reusable NCLMHs prevented the potential secondary pollution. Interestingly, the three remediated soils reached the corresponding regulation of the permissible limits for Pb and Cu residential scenarios in medium-to-heavily agricultural polluted soils, alleviating the Pb/Cu bioaccumulation and phytotoxicity symptoms in cultivated wheat, especially after MF@NCLMH treatment. This study introduces promising alternative remediation strategies with high sustainability and feasibility in acidic-to-neutral heavy metal-contaminated agricultural soil.
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PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Yizhen Zhang,Yu-Cai He,Cuiluan Ma
Lignin is a plentiful and readily accessible renewable resource. Vanillylamine is a crucial raw material used to synthesize pharmaceuticals and high-value furan compounds that can be acquired by aminating lignin-derived vanillin (Van). However, effectually achieving the biocatalytic synthesis of vanillylamine has remained challenging. In this study, a dimethyl sulfoxide (DMSO)-H 2 O (1:9, vol/vol) bioreaction medium was constructed, and a recombinant E. coli ATA1012 carrying ω-transaminase from Caulobacter sp. D5 was used as the ω-transaminase biocatalyst to acquire the effectual biocatalytic synthesis of vanillylamine. Under optimized bioreaction conditions (37 ℃ and pH 7.5) by supplementary of isopropylamine (IPA) (Van/IPA = 1:5, mol/mol), 80–100 mM Van could be effectually converted by ATA1012 whole cells in DMSO-H 2 O (1:9, vol/vol) within 12 h, yielding 91.2 %–95.4 % vanillylamine, with >99 % selectivity. An efficient amination process was developed using ATA1012 with superior transaminase catalytic activity and substrate tolerance to effectively convert Van to vanillylamine in a DMSO-H 2 O medium.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zicheng Du,Baojie Liu,Xiaoying Liu,Lu Liu,Chen Liang,Shuangquan Yao,Chengrong Qin
Separating low condensed lignin from lignocellulosic biomass is of great importance for achieving its full component conversion. This study proposed a new efficient and environmentally friendly alcohol/acid pretreatment system using 1,4-butanediol (1,4-BDO) as a solvent, combined with p -toluene sulfonic acid ( p -TsOH) to efficiently separate low condensed lignin. The results showed that the system could remove 85.55 % of hemicellulose and 84.78 % of lignin in a short time, with a high retention rate of cellulose. Based on the phenomenon of 1,4-BDO molecule protecting lignin structure, the recovered low-condensed lignin structure contains the main aliphatic hydroxyl structure, and the remaining solid surface lignin condensation grains were fewer, and the fiber crystallinity was high, which was beneficial for the preparation of high-value products. In addition, the lignin dissolution kinetics revealed that the p -TsOH/1,4-BDO pretreatment had a lower reaction activation energy, clarifying the solvation effect of 1,4-BDO on efficient lignin dissolution. Finally, combining density functional theory (DFT) from the molecular level clarified that the hydrogen bonding and conjugated effect between 1,4-BDO and lignin structure could effectively reduce the self-condensation reaction of lignin molecules. This study achieved effective separation of lignocellulosic biomass, providing a theoretical basis for the application of 1,4-BDO in biomass component separation, and promoting the development of green and efficient component separation technologies.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Hu Yang,Yiqing Yang,Lin Deng,Zhifa Li,Shixue Ren,Jiguo Zhang,Jianfeng Zhan
This study addresses the waste of resources and environmental pollution associated with the use of traditional, non-recyclable, epoxy resins produced using petroleum-based products. Totally biomass-based epoxy resins (TPLs) have been developed by replacing bisphenol A diglycidyl ether with epoxide-modified tannic acid and replacing petroleum-based curing agents with carboxylate-modified lignin. Because of the incorporation of dynamic covalently bonded β-hydroxy esters, TPLs are suitable for closed-loop recycling. For example, one of the new epoxy resins (TPL-0.1) had an initial tensile strength of 26.1 MPa and retained almost all of this (80 %, 20.6 MPa) following closed-loop regeneration using a solvent mixture containing ethylene glycol and water (6:4). A second epoxy resin, TPL-0.05, which contains a higher proportion of lignin, showed remarkable versatility, not only achieving a shear strength of 12.4 MPa when used as an adhesive but also having excellent photothermal properties. TPL-0.05 has a photothermal conversion efficiency of 47.8 %, with surface temperatures reaching 120.5 °C under 1 kW·m −2 irradiation. When used as a coating in a solar water heater, the water temperature increased from 20 °C to 55 °C within 10 min, representing a 340.7 % improvement in heating rate compared with an uncoated control. This research offers an innovative approach for developing recyclable, high-performance epoxy resins and promotes the sustainable advancement of epoxy resin technology through the high-value utilization of biomass resources and dynamic bond design.
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PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Jiaqi Chen,Mingzhi Li,Yanyao Cai,Yangzi Luo,Haodong Huang,Ruifeng Luo,Yuanyuan Ge,Zhili Li
Lignin has attracted attention in water treatment due to its extensive sources, complex structure, environmental friendliness, and functionality. Mannich modification is an effective method for enhancing the lignin's active sites, but it typically requires high temperatures and long reaction times, which limits its scalability for practical application. This study presents a simple, one-step Mannich reaction at room temperature for synthesizing aminated lignin (NAL) with high yield and ultra-high nitrogen content (17.34 %), using triethylenetetramine (TETA) as a modifier. The method effectively leverages TETA's symmetrical polyamine properties and glutaraldehyde (GDA)'s dual crosslinking functionality. Density functional theory (DFT) revealed that the potential and the discrepancy of reactive groups' energy gap (E gap ) were the key factors influencing the synthesis. The as-designed NAL exhibited excellent adsorption capacities of 1088.71 mg/g and 909.09 mg/g at 318 K for Hg(II) and Congo red (CR), respectively, that were superior to most reported modified lignin-based adsorbents. NAL also demonstrated robust resistance to ion interference, good reusability, and practical applicability. Notably, the adsorption performance of CR in the Hg(II)-CR binary system was enhanced with an adsorption capacity ratio (R q ) reaching 2.09. XPS, Zeta potential, and DFT calculations revealed that NAL's superior adsorption properties result from multiple interactions, including coordination, π-π interactions, hydrogen bonding, and electrostatic forces. Overall, NAL represents a green and highly effective material for environmental remediation with significant research and practical application value.
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PubMed
高影响因子
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