ACS Omega
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2019
·
IF 2.584
Chen Liang,Yan Wang,Yangdong Hu,Lianying Wu,Weitao Zhang
Butyl levulinate (BL) is a versatile chemical utilized widely in food and chemical industries, the production of which by using cellulose in biomass resources is of great significance to its sustainable development. Traditional synthesis processes for n-butyl levulinate are confronted with various problems such as high cost of raw materials, difficulty in separating products, etc. In this paper, a novel process for the preparation of BL from cellulose is proposed. The process is composed of five main unit operations including fed-batch hydrolysis, decolorization, extraction, esterification and purification. A 171.63 g/L concentration of the intermediate levulinic acid was obtained at the fifth feeding through the fed-batch hydrolysis process. The resin-activated carbon secondary decolorization method was adopted to remove the soluble humin byproducts with an accumulative decolorization rate of 89%. In the extraction process, the product BL was chosen as the extractant to avoid the introduction of new impurities. After purification, the purity of the final product BL reaches up to 98 wt %. The proposed technique allows for cost-effective and eco-friendly production of BL from biomass resources.
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PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 27
·期 1
·357-367
·
IF 3.917
Wu Hao,Tian HuaFeng,Li ShuJing,Wang YuTang,Ma ZhaoCheng,Song ZiHan,Wang JianGuo
Along with the concerns for food safety and environment, the demand of cost-effective and biodegradable materials in food treatment is increasing. In order to solve the problem of certain spoilage microorganisms, nisin anchored cellulose beads were prepared by a sol–gel transition method. By mixing γ -Fe 2 O 3 nanoparticles with cellulose in 8% LiOH·H 2 O/15% urea aqueous solution precooled at − 20 °C, regenerated cellulose beads mixed with γ -Fe 2 O 3 nanoparticles (RC) were fabricated via a dropping technology. Subsequently, cellulose beads were oxidized by sodium periodate in dark room and nisin was anchored on the beads (NCs) through Schiff base reaction. The oxidization process and grafting reaction between the amino groups of nisin and the aldehyde groups of oxidized cellulose were confirmed via Fourier transform infrared spectra, field emission scanning electron microscope, energy dispersive X-ray spectroscopy and X-ray diffraction. The beads containing γ -Fe 2 O 3 nanoparticles exhibits the sensitive magnetic response and excellent thermal stability with decomposition temperature over 200 °C. A long-term antimicrobial activity against Alicyclobacillus acidoterrestris DSM 3922 were investigated. To the best of our knowledge, this is the first report of such nisin-anchored beads. The biodegradable nisin-anchored beads are novel antimicrobial materials with great potential in food industry.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Guihua Yan,Yunchao Feng,Zhebang Gao,Xianhai Zeng,Wenjing Hong,Wenjie Liu,Yong Sun,Xing Tang,Tingzhou Lei,Lu Lin
Controlling the structure, particularly the structure template stability, has great potential for the fabrication of high-capacity and renewable drug carriers. Herein, novel porous CaCO3 microspheres about 2–3.5 μm with hollow cellulose nanoparticles (NPs, diameter centered at 15–35 nm) as templates were first assembled, with a highly specific surface area of ∼363 m2/g. The hollow cellulose NPs were previously prepared by the water-soluble dialdehyde cellulose, followed by the reduction of l-arginine (RDACws). Such self-assembled CaCO3 microspheres showed outstanding stability, which could retain high porosity for over 4 weeks under ethanol storage conditions, due to the electrostatic interactions between Ca2+ and the preassembled RDACws nanostructures. Furthermore, the porous CaCO3 microspheres as potential drug carriers showed good encapsulation efficiency, excellent pH responsiveness (pH = 2.0 ≫ 7.4), and good biocompatibility, which could control the drug release at a specific location. The CaCO3 microspheres regulated by sustainable hollow cellulose NPs put forward for the first time a sustained drug release, demonstrating that the cellulose hollow NPs together with the mineralization theory bring a brilliant prospect to biomineral materials.
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CELLULOSE
·
2018
·Vol. 25
·期 7
·4133-4144
·
IF 3.809
Geng Aobo,Meng Liang,Han Jingquan,Zhong Qiang,Li Meirun,Han Shuguang,Mei Changtong,Xu Lijie,Tan Lin,Gan Lu
Abstract There is an urgent need to explore alternatives to replace traditional carbonaceous materials because of dwindling oil reserves and increasing atomospheric carbon dioxide. In the present study, the cellulose derived carbon nanofibers (CCNF) were prepared and used to hybridize with bismuth oxybromide to prepare novel photocatalyst composites (CCNF/BiOBr). The structural properties of the prepared composites were then characterized. Afterwards, the photocatalytic performance of the CCNF/BiOBr composites was investigated through degrading rhodamine B (RhB) under continuous visible light irradiation. The results indicated that the pyrolysis process could convert the cellulose to carbon nanofiber with high graphitization degree. The photocatalytic performance of the CCNF/BiOBr composite was better than that of the pure BiOBr, which was ascribed to the introduction of the CCNF into the composite system. The present work provides a promising way to design new photocatalyst composites with desirable carbon alternatives from biomass materials for effective treatment of organic contaminants in water media. Graphical Abstract
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Li Qu,Hailong Yu,Fengli Yu,Bing Yuan,Congxia Xie,Shitao Yu
A new and environmental friendly route has been developed to hydrogenate α-pinene to cis -pinane. The α-pinene was hydrogenated using ruthenium (Ru) nanoparticles that were stabilized by modified carboxymethyl cellulose in aqueous medium. The conversion of α-pinene reached 96.6% and the selectivity of cis -pinane was 98.4%. Ru nanoparticles could be recycled 18 times. Ru nanoparticles and micelles were characterized by transmission electron microscopy (TEM), confocal laser scanning microscopy (CLSM), dynamic light scattering (DLS), X-ray diffraction (XRD), and other detection techniques. Ru nanoparticles (3.2 nm) had a good stability and uniform distribution, the reaction was divided into micelles that appeared to act as “microreactors”, and the micelle size was increased in the absence of sodium carbonate. The good stability of the Ru nanoparticles could be attributed to electrostatic and steric stabilization.
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高影响因子
MINERALS ENGINEERING
·
2018
·
IF 2.707
Wanghuan Guo,Fan Yang,Zhigang Zhao,Qiuxia Liao,Chunqing Cai,Yang Zhang,Ruixi Bai
To achieve an adsorbent that has better absorption and extraction performance, carboxymethyl-diethylammoniumethyl cellulose (CMDEAEC), a low-cost cellulose-based ionic liquid that possesses a nanoscale particle size and good swellability to increase the contact area, was prepared through a one-step reaction. The chemically modified cellulose was verified by Fourier transform infrared spectroscopy, elemental analysis and scanning electron microscopy. As an adsorbent, CMDEAEC was used for selective recovery of metal ions. The effects of pH, adsorbent dose, initial concentration, and contact time on metal ion adsorption were examined. CMDEAEC was found to exhibit selectivity only for Au(III). Additionally, the adsorption process follows the Langmuir isotherm model and the pseudo-second-order kinetics model. Furthermore, the desorption of ions from CMDEAEC and the regeneration capacity of CMDEAEC were investigated. In conclusion, as an efficient, low-cost, easily obtained and environmentally friendly adsorbent, CMDEAEC is expected to be used for the selective recovery of gold.
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GREEN CHEMISTRY
·
2018
·Vol. 20
·期 15
·3634-3642
·
IF 8.586
Bin Zhang,Bin Chen,Mark Douthwaite,Qiang Liu,Chao Zhang,Qifan Wu,Ruhui Shi,Peixuan Wu,Fengyu Zhao,Graham Hutchings
Carbon based materials are some of the most commonly studied catalysts for the conversion of cellulose to polyols. The catalytic performance of these materials, however, is typically limited by the access of the substrate to the active sites, which is governed by the poor solubility of cellulose in aqueous solutions. In an attempt to resolve this, we presented a novel hierarchical carbon material which was synthesized by a dual-templating method. Transmission electron microscopy and porosity measurements confirmed that the resultant materials consisted of both spherical macropores and well-defined mesoporous channels. Additional characterisation of this material revealed that it has an exceptionally high surface area (>1110 m2 g−1) and a high concentration of acidic sites, which are considered to be crucial for the hydrolysis of cellulose. Ni nanoparticles were subsequently immobilised onto this material and some additional carbon supports. It was determined that the high surface area and porosity of the synthesised carbon material assisted with the dispersion of the Ni nanoparticles. This Ni catalyst was found to be highly efficient for the one-pot conversion of cellulose to polyols, which is proposed to be a consequence of both the high number of acid sites and excellent Ni dispersion. This approach to catalyst design, offers a novel method for the valorisation of cellulose.
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高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Xiao Wei,Ting Huang,Jun Nie,Jing-hui Yang,Xiao-dong Qi,Zuo-wan Zhou,Yong Wang
As one of the materials from natural resources, the functionalization and application of cellulose attract increasing concerns. In this work, we reported a facile method to prepare the bio-inspired functionalization of microcrystalline cellulose (MCC) aerogel through polydopamine (PDA) coating, which was realized via the self-polymerization of dopamine in the MCC/LiBr solution followed by the freeze-drying technology. The morphological characterization showed that the pore morphologies of the compounded aerogel were influenced by the content of PDA. Adsorption measurements toward methylene blue (MB) showed that the compounded aerogel had high adsorption ability. Moreover, the compounded MCC/PDA aerogel exhibited excellent adsorption selectivity and it exhibited high efficiency to remove MB from different solutions, such as the mixed solution with anionic dyestuffs, the mixed solution with cationic dyestuffs and the mixed solution with common salt (NaCl). The high adsorption ability and excellent adsorption selectivity endows the compounded MCC/PDA aerogel with great potential applications in wastewater treatment.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 46
·46824
·
IF 1.901
Yuyu Liu,Lingli Deng,Cen Zhang,Kailun Chen,Fengqin Feng,Hui Zhang
In this study, we fabricated ethyl cellulose (EC)–gelatin (G) composite films by solvent casting and electrospinning. The characterization of the cast and electrospun films was performed by scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectrometry, and water contact angle measurements. The results showed that the blending of EC with G improved the spinnability of the composite films with higher thermal stability. Compared with solvent casting, electrospinning induced a helix-to-coil transition of G and provided more hydrogen-forming sites for EC to form a compatible network. Interestingly, the electrospun composite film had a hydrophobic surface with a water contact angle of 113.8°, whereas the cast composite film showed a hydrophilic surface at 67.5°. The confocal laser scanning microscopy observations suggested that after water immersion, the cast composite film collapsed into aggregates, whereas the electrospun composite film maintained the nanofibrous structures well; this indicated an improved water resistance. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46824.
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高影响因子
COMPOSITES PART B-ENGINEERING
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2018
·
IF 4.92
Kuichuan Sheng,Shen Zhang,Shaoping Qian,Cesar A. Fontanillo Lopez
We prepared poly(lactic acid) (PLA)/bamboo cellulose nanowhiskers (BCNW) bionanocomposite with a high toughness but a low modulus in the previous work. In this paper, a new reinforcement, silane surface-modified ultrafine bamboo-char (UFBC), was employed to strengthen the binary PLA/BCNW bionanocomposite. The ternary bionanocomposite films were fabricated by a solution casting with different contents of surface-treated UFBC in the range of 0.25 wt% to 4.0 wt%. The functionalization of UFBC with (3-mercaptopropyl)trimethoxysilane (A-189) favored its dispersion in the PLA matrix; sea-island and nuclear-shell characteristics were observed by the scanning electron microscopy (SEM) and transmission electron microscopy (TEM). When the UFBC content was 0.25 wt%, the tensile strength and elongation at break increased by 99.26% and 104.93%, respectively, comparing to the neat PLA. Differential scanning calorimetry (DSC) results showed that glass transition temperature , crystallization temperature , crystallization enthalpy and crystallinity increased with the increase of UFBC contents. Thermogravimetric analysis demonstrated that the thermal degradation stability decreased with the UFBC addition. BCNW and UFBC produced a synergistic effect on composites’ toughening and strengthening. These results provided a basic understanding of PLA enhancement mechanism and a simple approach for PLA composite manufacture with sound mechanical properties .
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高影响因子
Journal of Biobased Materials and Bioenergy
·
2018
·Vol. 12
·期 4
·387-391
·
IF 2.993
Si Junhui,Ye Jianhua,Chen Pengfei,Chen Song,Cui Zhixiang,Wang Qiangting
For the purpose to improve the capacity of biomimetic mineralization of thermoplastic polyurethane (TPU) nanofiber. A novel, straightforward, fast and versatile method was developed to modify the surface of TPU nanofiber with cellulose nanocrystal (CNC) particles for the improvement
of hydrophilic property. The TPU nanofiber was prepared by using electrospinning. And then the surface of TPU nanofiber was modified through simply immersing it into CNC dispersion and subjecting to ultrasonication. Finally, the TPU/CNF nanofiber was biomineralized by treatment in simulated
body fluid (SBF). The results showed that the biomimetic mineralized TPU/CNC-HA fibrous scaffold for bone regeneration was successfully fabricated and the introduction of CNC particles can effectively increase the deposition rate of biomimetic HA crystals on the surface of TPU nanofiber. The
fabricated TPU/CNC-HA fibrous scaffold contains a high quality mineralized coating and shows that its tensile strength and Young's module are significantly larger than these of TPU scaffold. Moreover, the scaffold can mimic the morphology and components of natural bone and provide a potential
application in bone regeneration.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 15
·10920-10932
·
IF 2.993
Qian Shaoping,Sheng Kuichuan,Yu Kai,Xu Linqiong,Fontanillo Lopez Cesar A.
Poly(lactic acid) (PLA) is a potential green alternative for conventional petroleum-based plastics. However, the brittleness limits its application (e.g., agricultural films, garbage bags, plastic bags, food containers, food packaging). In this study, silane-compatibilized (triethoxyvinylsilane, A-151) bamboo cellulose nanowhiskers (BCNW) were introduced into a PLA matrix to toughen the composites. The A-151 successfully grafted on the surface of cellulose, and the thermal degradation stability of BCNW decreased after A-151 modification. Morphological, tensile and thermal properties of the toughened PLA bionanocomposites were investigated, and the toughen mechanism was clarified. The silane linked BCNW and PLA via Si–O–C bonds and hydrogen bonds. Elongation at break of the composites remarkably increased from 12.3 ± 1.7% (untreated) to 213.8 ± 21.6% (16 wt% A-151 treated). Both tensile strength and modulus decreased with the silane treatment. Typical toughness fracture characteristic (wire-drawing) was observed on the fractural surface. Glass transition temperature and crystallinity decreased from 45.6 °C/30.33% (untreated) to 33.6 °C/13.23% (16 wt% A-151 treated).
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