FOOD HYDROCOLLOIDS
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2024
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IF 11
Jianming Tao,Lin Lei,Fayin Ye,Guohua Zhao
Colloidal lignin particles (CLPs), derived from ubiquitous dietary fiber, are emerging as viable emulsifiers due to their sustainability and biocompatibility. Despite appealing advantages, the emulsifying capacity of CLPs in triglyceride matrices (e.g. edible oil) is constrained by their inadequate amphipathic properties. As characterized by intermediate wettability and renewable provenance, sodium caseinate (Cas) is proposed as a promising surface modifier to enhance the interfacial performance of CLPs. This study conscientiously delved into the adsorption dynamics of Cas onto CLPs and elucidated the ramifications of Cas coating on the physicochemical attributes of CLPs and consequent sunflower oil-loaded emulsions. The presence of non-covalent forces was a crucial factor in consolidating the chemisorption of Cas onto CLPs, where hydrophobic interactions exerted the major contribution. Progressive increments of Cas coating were observed to enhance particle size and hydrophobicity while diminishing the absolute surface charge of the colloidal entities, thus bolstering their interfacial affinity accompanied by distinct adsorption behaviors. As a result, Cas molecules improved the stability of CLPs-based Pickering emulsions mainly by thick interfacial layers and fortified network structures. With the highest level of curcumin retention observed in the 0.16Cas-CLPs emulsion, the encapsulated systems stabilized by modified CLPs effectively protected photosensitive compounds against ultraviolet irradiation.
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高影响因子
BIORESOURCE TECHNOLOGY
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2016
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IF 4.917
Yigang Chen,Fang Wang,Yingjie Jia,Nan Yang,Xianming Zhang
Catalytic depolymerization of lignin for preparation of aromatic hydrocarbons without external hydrogen was first carried out over nano-SiC catalyst in supercritical ethanol. Mixture of the catalyst and lignin was innovatively suspended in a closed reactor and small-molecular aromatic hydrocarbons were successfully achieved at 500 °C. Results revealed that not only did conversion of lignin increase sharply under the nano-SiC catalyst, but also phenols were not detected. The increase of residence time under the Fe-SiC catalyst did not change distribution of the liquid products besides the yield improvement, suggesting that the catalyst was suitable and selective towards formation of small-molecular benzenes, especially C 6 –C 8 benzenes. Preliminary studies found that lignin depolymerization and deoxygenation were successfully fulfilled during the reactions, which provided a very effective route to conversion of lignin into high added-value molecules as transportation fuel additives.
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PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2016
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IF 4.917
Riyang Shu,Qi Zhang,Longlong Ma,Ying Xu,Pengru Chen,Chenguang Wang,Tiejun Wang
The aim of this study is to explore the reaction mediums and conditions for producing high yield of valuable monomers from concentrated sulfuric acid hydrolyzed lignin. The solvent, temperature and time effects on the hydrogenolysis of hydrolyzed lignin were investigated under the catalysis of Pd/C and CrCl 3 . Supercritical methanol exhibits the best depolymerization performance, because of its unique diffusion, dissolution and acid-base properties. Afterwards, the influence of reaction temperature and time on depolymerization, repolymerization and coking during hydrogenolysis was examined in methanol. The high temperature is found to favor the depolymerization, with the β-O-4 linkages cleaved significantly. However, the repolymerization is promoted simultaneously, and a high amount of β-β groups form. These reactions are in constant competition with each other and the repolymerization is preferred at excessive high temperature, producing bulk char residues, that is coking. This study will provide a beneficial reference for the maximization of lignin waste valorization.
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PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2016
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IF 3.652
Zhen-Yi Du,Xia Wang,Zhi-Hua Zhang,Jie Feng,Yu-Hong Qin,Bin-Bin Zhang,Wen-Ying Li
The reforming characteristics of biomass volatiles on anthracite chars were investigated by comparing the structural evolution of tars derived from cellulose and lignin as the major biomass components. In a two-stage quartz reactor, the pyrolysis volatiles of cellulose and lignin were produced in the first stage and then reformed in the second stage with or without the presence of anthracite chars between 600 and 900 °C. The results show that the presence of anthracite chars enhanced the destruction of volatiles of both feedstocks. Furthermore, the tar yields of lignin showed a slower decreasing trend with temperature than those of cellulose, suggesting that the lignin volatiles were more refractory to be reformed. The lignin tars had higher molecular weights and contained higher percentage of compounds with large aromatic ring systems (≥3 fused benzene rings) than cellulose tars in the studied temperature range. Compositional analysis revealed that tars of both feedstocks experienced the transition from phenolic compounds to polycyclic aromatic hydrocarbons with increasing temperature. The surface areas of anthracite chars were reduced because of coke deposition after interacting with the volatiles of both feedstocks below 800 °C, above which the net gasification of chars took place.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2017
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IF 5.951
Tao Zheng,Dafeng Zheng,Xiaokang Li,Cheng Cai,Hongming Lou,Weifeng Liu,Xueqing Qiu
To improve the dispersion capacity of poly(carboxylate ether) (PCE) in clay-containing cement paste, lignosulfonate (LS) was quaternized with 3-chloro-2-hydroxypropyl trimethylammonium chloride (CHPTAC), and the product quaternized lignosulfonate (QL) was characterized by FT-IR spectroscopy, element analysis, and zeta potential. The fluidity of the montmorillonite- (MMT-) containing cement paste was clearly improved upon the addition of 0.010 wt % QL, as the yield stress and the rheological behavior index of the paste were reduced. XRD analysis indicated that the adsorption of QL on MMT was driven by a strong electrostatic attraction, rather than intercalation, which was much stronger than that for LS. DLS also showed that the steric effect of QL was much stronger than that of PCE. As a result, when QL and PCE were added to the MMT-containing cement paste, QL adsorbed on the MMT surface preferentially and hindered the adsorption of PCE.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Yuanyuan Li,Xueqing Qiu,Yong Qian,Wenlong Xiong,Dongjie Yang
We developed a simple and practical method to prepare pH-responsive lignin-based complex micelles in green solvents using purified alkali lignin. Alkali lignin (AL) was quaternized and further self-assembled into lignin-based complex micelles with sodium dodecyl benzenesulfonate (SDBS) in an ethanol/water mixture. The FT-IR and 1 H NMR spectra indicated the successful grafting of quaternary ammonium groups on AL. TEM images showed that the complex micelles were uniform spherical nanoparticles. The complex micelles also exhibited rich phase behaviors responding to pH changes. Ibuprofen (IBU) was used as a drug model and more than 74.44% could be encapsulated via hydrophobic interactions. The in vitro release behavior of IBU was pH-dependent and exhibited controlled release properties. Therefore, more than 75% of IBU could be preserved in simulated gastric fluid (SGF, pH 1.2), and over 90% could be released smoothly in simulated intestinal fluid (SIF, pH 7.4). This work suggests a novel strategy for fabricating an oral drug delivery carrier and is of significance for the value-added utilization of lignin.
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高影响因子
Journal of Environmental Chemical Engineering
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2016
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IF 0
Yufang Tang,Yongde Zeng,Tao Hu,Qiang Zhou,Yongzhen Peng
In this study, lignin sulfonate-based mesoporous materials (LSMMs) were prepared and applied for removal malachite green (MG) from aqueous solution. Lignin sulfonate- g -poly (acrylic acid- r -acrylamide) was prepared by grafting poly(acrylic acid- r -acrylamide) onto a lignin sulfonate molecule followed by crosslinking. N 2 adsorption/desorption indicated that the corsslinked lignin sulfonate- g -poly(acrylic acid- r -acrylamide) were mesoporous materials. The batch adsorption experiments of MG on LSMMs were carried out to evaluate the performance of the LSMMs. Results revealed that the maximum percentage adsorption of MG on the LSMMs is more than that of MG on the lignin sulfonate-based polymer without grafted copolymer with a maximum difference of 37% in the same adsorption conditions. pH, adsorbent dosage, initial MG concentration and temperature are just the parameters that could exhibit breathing effect to the adsorption process. The adsorption kinetics follows a pseudo-second-order kinetics, intra-particle diffusion is not the only rate-controlling step in the entire adsorption process, and the equilibrium adsorption data could be described well by the Langmuir isotherm equation. The adsorption process is endothermic, spontaneous and random. LSMMs can be used as low-cost adsorbent for refractory cationic organic dye in effluent.
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MATERIALS & DESIGN
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2016
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IF 3.997
Yuanyuan Ge,Li Qin,Zhili Li
An increased interest in development of natural polymer-based sorbent for cleanup of heavy metals in water has been seen due to their abundance, low-in cost, and eco-friendliness. Lignin, the second most abundant natural polymer next to cellulose , however, is much limited by low response rate and low adsorption capability to heavy metals. Here, we show a new type of lignin microspheres (LMS) prepared by an inverse suspension copolymerization method for effective removal of Pb(II) in water. The prepared LMS was in diameter of 348 μm with a large surface area of 9.6 m 2 /g, 5.3 times of lignin, and contained abundant amine functional groups (total N: 7.5 mmol/g). LMS showed a fast response rate and a high adsorption capacity to Pb(II) (33.9 mg/g), 137% and 280% larger than alkaline lignin and poplar lignin, respectively. The adsorption process was endothermic and spontaneous in nature. Moreover, the lead-loading LMS could be easily regenerated with a high adsorption stability , after five adsorption–desorption cycles, the adsorption capacity only decreased by 12.5%. The proposed LMS is eco-friendly, cost-effective and therefore a promising candidate for Pb(II) retention with effective adsorption and reusable abilities.
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高影响因子
RSC Advances
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2016
·Vol. 6
·期 109
·107970-107976
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IF 3.289
Jiao Chen,Chao Liu,Shubin Wu,Jiajin Liang,Ming Lei
Black liquor is an attractive option for the generation of biofuel and fine chemical intermediates. In this work, kraft lignin was extracted from black liquor and its potential was evaluated in the production of high quality bio-oil via catalytic pyrolysis under two different reaction regimes (N2 and 10% H2 in N2). The 2D HSQC NMR result showed that the lignin obtained directly through acidic precipitation with CO2 mainly consisted of syringyl lignin units and cross-linked C–C bond substructures. The thermal decomposition of the sample mainly occurred at 200–500 °C and the char yield was 44.46% at 700 °C. The catalytic pyrolysis experiment indicated that the addition of catalysts (NiO, MoO2, and Co3O4) could inhibit char formation and enhance the properties of bio-oil by removing oxygenated compounds via releasing CO and CO2 under a N2 atmosphere. The addition of the catalysts could prompt lignin degradation and increase the yield of bio-oil in the presence of H2. The yield of bio-oil increased by 26.38% with Co3O4 catalytic pyrolysis under a H2/N2 atmosphere.
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高影响因子
CELLULOSE
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2017
·Vol. 24
·期 12
·5327-5339
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IF 3.417
Gan Linhuo,Zhu Jundong,Lv Li
Acidic carbonaceous solids were synthesized from mass pine alkali lignin via hydrothermal carbonization followed by sulfonation. Hydrothermal carbonization of lignin in the presence of acrylic acid (LAHC-SO 3 H) provided many more carboxylic groups than that in the absence of acrylic acid, allowing subsequent sulfonation to produce a highly active and stable catalyst for cellulose hydrolysis in the [BMIM]Cl-H 2 O solvent system. The hydrochar and catalyst were characterized using field emission scanning electron microscopy, X-ray diffractometer, X-ray photoelectron spectroscopy, thermal gravimetric analysis, Fourier transform infrared spectrometer, Brunauer–Emmett–Teller and acid–base titration. Results showed that a high acid content of 5.48 mmol/g, including carboxylic group (2.85 mmol/g), phenolic hydroxyl group (1.05 mmol/g) and sulfonic acid group (1.58 mmol/g), contributed significantly to the highly efficient hydrolysis of cellulose. Further, it was found that addition of trace water in [BMIM]Cl was favorable to cellulose hydrolysis. The highest yield (75.4%) of total reducing sugar (TRS) obtained in [BMIM]Cl-H 2 O at a mass ratio of 100:1 was more than twice that (36.1%) achieved in [BMIM]Cl without water; the corresponding reaction conditions were 50 mg of microcrystalline cellulose, 30 mg of catalyst, 1.0 g of [BMIM]Cl, 10 mg of H 2 O, reaction temperature of 130 °C and reaction time of 2 h. Furthermore, the TRS yield with 5 cycles for LAHC-SO 3 H was higher than 68.1%, and the catalytic activity of catalyst could be fully recovered (74.0% of TRS yield) easily by regeneration.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2015
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IF 3.313
Ying Su,Wei Zhu,Miao Gong,Haiyun Zhou,Yujie Fan,Basil Amuzu-Sefordzi
The interaction between lignin and proteins was investigated to improve understanding of supercritical water gasification (SCWG) of sewage sludge from water treatment. Phenol and alanine were used as model compounds, and mixed in proportions from 0 to 100%. The mixtures were gasified at 400 °C and 22–26 MPa in a batch reactor with a residence time of 30 min. SCWG of the mixtures enhanced total gas, H 2 , and CO 2 yields compared with weighted average values. The maximum increase of H 2 yield was at 60 wt% alanine, and the H 2 yield was about twice the weighted average value. Co-gasification of the compounds in supercritical water facilitated the removal of total organic carbon and total nitrogen from the aqueous phase , and the generation of oil phase products, mainly phenol compounds and organic compounds containing nitrogen. The increase of gas and oil phase products may be caused by phenol promoting the decomposition of alanine, while alanine promotes the condensation of phenol.
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高影响因子
ENERGY CONVERSION AND MANAGEMENT
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2015
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IF 4.38
Jinxing Long,Shiyang Shu,Qingyun Wu,Zhengqiu Yuan,Tiejun Wang,Ying Xu,Xinghua Zhang,Qi Zhang,Longlong Ma
Selective production of cyclohexanol from renewable lignin derived phenolic has been presented using the cost-efficient catalyst Ni/MgO which shows excellent catalytic activity in the hydrogenation reaction and dehydroxylation inhibition. Guaiacol, one of the most abundant lignin depolymerization products, was selected as the model compound. The hydrogenation performance of guaiacol was investigated over various catalysts. The effect of the reaction parameters was also studied. The results showed that guaiacol could be efficiently converted to cyclohexanol, which is a highly value-added precursor and additive for bio-fuel that is generally obtained from unsustainable fossil resources. Under the mild condition (160 °C, 3 h and 3 MPa H 2 ), more than 97.74% of guaiacol conversion with 100% cyclohexanol selectivity can be achieved in the presence of 20% Ni/MgO. Intensive catalyst characterization demonstrated that the efficient promotion effect of the base carrier for the Ni active center was responsible for efficient guaiacol conversion and selective cyclohexanol production. Furthermore, the Ni/MgO catalyst showed excellent recyclability, where no significant activity loss was observed even after four runs. Moreover, the reaction pathway and the catalytic mechanism are proposed.
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危险品化学品经营许可证（带存储）