INDUSTRIAL CROPS AND PRODUCTS
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2022
·
IF 6.449
Jinsong Wang,Farzad Seidi,Yang Huang,Huining Xiao
Incorporating corrosion inhibitors in the formulation of coatings can yield active coatings which are able to provide a sustained release of the corrosion inhibitor in the case of emergence of microcrack in the structure of the coating. Herein, we developed bio-based polyurethane sublayer coatings with strong anticorrosion performances. First, lignin-corrosion inhibitor (LCI) conjugate was obtained through conjugation of nicotinic acid to lignin through hydrolytically cleavable ester linkage to afford the steady release of low concentrations of corrosion inhibitor in case of the emergence of microcracks. Subsequently, solution polyaddition of LCI with diisocyanates and polypropylene glycol and coating on the stainless steel surface afford the polyurethane coatings. Coating with a thickness of 16 µm increased the E corr from − 481 mV (for bare steel) to + 187 mV and reduced both I corr and corrosion rate more than 6700 times. As an added benefit, after creating artificial cracks on the surface of the coating, the release of corrosion inhibitors gradually increased the impedance value, indicating a thin barrier layer has formed within the cracks.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Lan Chen,Zhanming Liang,Xiaoxuan Zhang,Liming Zhang,Shuangfei Wang,Changzhou Chen,Ling Zeng,Douyong Min
Lignin is the most naturally abundant source of aromatics for phenolic chemicals, bioenergy sources, and functional materials. Recent works are devoted to the acid-catalyzed organosolv extraction for improving the lignin valorization. However, β –aryl ethers are mostly cleaved to form carbon–carbon bonds under the acidic condition. In this work, lignin isolated with methanolic hydrochloric acid (MHL) was compared with conventional milled wood lignin (MWL). The methanol incorporated into lignin as α –OCH 3 to prevent the cleavage of β –aryl ethers. As a result, the yield of MHL was over 12 times that of MWL. The MHL appeared a regular granular structure with an average diameter of 100 nm. Analysis of 13 C– 1 H HSQC NMR spectra showed that MHL contained 42.6 % β –O–4 linkages whereas 35.9 % for the MWL, as well as 6.5 % β –5 and 3.2 % β – β , which was less than MWL. Moreover, 13 C NMR spectroscopy confirmed that MHL was mainly isolated by the cleavage of the associated carbohydrates rather than the degradation of β –aryl ether bonds. Therefore, MHL can be utilized more as a native lignin representative than MWL for studying the physicochemical properties and the interior structures of the protolignin.
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APPLIED CATALYSIS A-GENERAL
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2022
·
IF 5.723
Qin Wang,Dan Luo,Jiansu Ran,Jie Zheng,Yuntong Cui,Ruixue Yangcheng,Shuang Luo,Jianjian Wang
It is highly desirable but of challenge to develop an efficient process for lactic acid (LaA) production from xylose performed in water. Herein, a novel catalyst prepared via a facile solvent-free coordination route is developed to efficiently produce LaA from xylose in water. The structural properties of the prepared catalyst and the reaction conditions are systematically investigated. The production rate of LaA at 190 °C in water is up to 1.8 h −1 , outperforming the most recent reports (below 1.1 h −1 ). Detailed experimental and characteristic studies reveal that the presence of Lewis acidic sites and basic sites in the catalyst structure can not only lower the energy barrier of xylose conversion but also boost the efficient conversion of the active reaction intermediates into LaA. The findings of this work will provide a new approach for the efficient production of LaA from carbohydrates.
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FOOD CHEMISTRY
·
2022
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IF 9.231
Sha Yan,Wenqian Wang,Wen Zhao,Wenli Tian,Xuan Wang,Liming Wu,Xiaofeng Xue
Mature honeys that brew naturally in the hive develop distinct bioactive components, and thus carry a higher premium due to their superior quality. However, how to identify mature honeys remains difficult. Trace oligosaccharides are a likely source of biomarkers to indicate maturity. Here, we profiled trace oligosaccharides in acacia honey by GC–MS and used a metabolomics strategy to screen oligosaccharides that distinguish honeys with different maturities. Turanose content increased gradually in acacia honey samples and was closely related to the days stored in the hive ( p < 0.05). To accurately quantify turanose, a UPLC-ELSD method was developed. Using the established method, honeys with ≥1.20 g/100 g of turanose could be classified as mature acacia honey. Based on the preliminary study, 500 commercial acacia honeys were analyzed, and only 77.2 % of these samples had a satisfactory level of turanose. This work offers a potential method to evaluate the quality of honeys.
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ANALYST
·
2022
·Vol. 147
·期 18
·4132-4140
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IF 5.227
Lingfeng Xu,Fangzhi Xiong,Minqing Kang,Yanrong Huang,Kui Wu
Viscosity is one of the most important physical parameters in a liquid, noninvasive, and effective viscosity inspection method toward liquid safety that needs to be developed urgently. In this study, two kinds of novel molecular sensors, namely, DPBID and DPTMID, were strategically constructed by the triphenylamine indanedione derivates; the rotatable conjugate structure was utilized as the recognition site and fluorescence quencher. This couple of molecular sensors was synthesized in a one-step facile manner. DPTMID displayed longer emission wavelength and larger Stokes shift (195 nm in water, 138 nm in glycerol) with a narrower energy band. Moreover, DPTMID exhibited high selectivity, sensitivity, and significant fluorescence signal enhancement toward a higher viscous microenvironment. The molecular sensor displayed good photostability, selectivity, and universality in various commercial liquids and featured with typical aggregation-induced emission (AIE). With the aid of DPTMID, the thickening effects of liquid thickeners can be captured. More importantly, DPTMID was explored to visualize the viscosity fluctuations during the metamorphic stages of liquids, and it was found that the microenvironment viscosity level is closely related to the spoilage degree of liquids. The method with rapid detection, high sensitivity, cheap equipment, and fast results output toward food quality and safety inspection can be achieved through this study.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2022
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IF 6.437
Bingbing Luo,Kai Wu,Jiajun Yu,Siyu Wang,Yihan Wang,Chenyang Chu,Huiyan Zhang
Catalytic pyrolysis of biomass for efficient N-heterocycles production is highly promising but extremely challenging. Herein, catalytic co-pyrolysis of glycerol and cellulose under ammonia atmosphere was proposed to enhance the N-heterocycles yield. First, a solvolysis effect of glycerol, which could improve the thermal depolymerization of cellulose, was observed in thermogravimetric analysis (TGA). After that, the major influential factors, including Si/Al ratio, reaction temperature, and glycerol-to-cellulose (Gly:Cel) ratio, were investigated systematically. The N-heterocycles yield, as well as the comprehensive synergies of feedstocks, reached their maximum value under the conditions of Si/Al = 85, 550 ℃, and Gly:Cel = 5:1. The best synergistic extents for pyrroles , pyridines, and indoles were 105.3%, 71.3%, and 38.8%, respectively. The mechanism insight showed that, the thermal decomposition of cellulose was promoted while the coking of oxygenated molecules was suppressed during the catalytic co-pyrolysis process. Consequently, more oxygenated molecules were generated and retained for further catalytic conversion into imine intermediates and N-heterocycles.
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JOURNAL OF CATALYSIS
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2022
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IF 8.047
Wen Xu,Xiaoshu Wang,Weilong Hou,Kang Tang,Xinqing Lu,Yijing Gao,Rui Ma,Yanghe Fu,Weidong Zhu
Although the titanosilicate zeolite catalyzed one-pot oxidative hydration of ethylene with hydrogen peroxide (H 2 O 2 ) to ethylene glycol (EG) takes advantages of step-saving and facile operation, both H 2 O 2 utilization efficiency and EG yield are relatively low. In the present work, Sn-doped Ti-MWW zeolites, named Sn-Ti-MWW, were developed for this oxidative hydration, showing the much higher H 2 O 2 utilization efficiency and EG yield, compared to Ti-MWW. The extensive characterizations of Sn-Ti-MWW zeolites, in combination with Density Functional Theory (DFT) calculations, verify that the doping of Sn into Ti-MWW leads to the higher electropositivity of the Ti species, resulting in the stronger acidity of the zeolite, which is helpful to the H 2 O 2 utilization and EG production. In addition, although the catalyst deactivation is observed due to the deposition of the bulky byproducts onto the active sites and/or into the zeolite micropores, the simple calcination of the used catalyst readily restores its catalytic activity. Therefore, it is anticipated that the developed Sn-Ti-MWW catalyst might be applicable in the one-pot oxidative hydration of ethylene with H 2 O 2 to EG industrially.
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CHEMOSPHERE
·
2021
·
IF 7.086
Shuhao Liu,Jinglong Han,Yangcheng Ding,Xiaoxu Gao,Haoyi Cheng,Hongcheng Wang,Chunshuang Liu,Aijie Wang
Pyridine and its derivatives are widely consumed and detected in the environment persistently, which can cause potential adverse impacts on environment and human health. Considering the fact that pyridine could absorb UV light at 254 nm to generate excited one, which could react with reductive radicals, promoting its structural changes, we proposed that one typical efficient advanced reduction process (ARP) which combines UV irradiation with sulfite could be used to eliminate pyridine quickly. Sulfite/UV process showed a higher pyridine removal rate with a pseudo-first-order reaction rate constant of 0.1439 min −1 , which was 3 times of that in UV irradiation and 1.3 times in UV/H 2 O 2 process. This was primarily due to reductive radicals (e aq – , H • and SO 3 •– ) produced by UV irradiation. The removal rate of pyridine was highest in slightly alkaline environment . And the presence of oxygen, as well as certain concentration of humid acid just showed slight inhibition, indicating the possibility of application in practical environment. A positive impact was observed with increasing sulfite dosage, but it was gradually inhabited when the dosage was over 5 mM. The present study may provide an alternative efficient technology for the degradation of pyridine ring-containing substances.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
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IF 5.455
Linjie Guan,Chengming Huang,Dingmei Han,Linhua Zhu,Yi Mei,Dedong He,Yun Zu
Three zeolites ZSM-5, ZSM-35 and ZSM-22 are applied in n -butane cracking to reveal the influence of regional differences in Brønsted acid sites on reaction pathways. The Brønsted acid sites located in the channels of ZSM-5 exhibit a higher catalytic activity and yields to light olefins (especially the ethylene), which can be attributed to more relative contribution of bimolecular pathway. In comparison, more Brønsted acid sites are situated on the external surface or micropore mouths of ZSM-35 and ZSM-22, which are beneficial to propylene production. Note-worthily, almost no propane production on the two zeolites implies the predomination of monomolecular pathway. In situ FTIR technique further discloses that the difference in the reaction pathways is tailored by adsorption configurations of n -butane at two types of Brønsted acid sites. Under comparable conditions, the ZSM-5 performs a relatively good catalytic stability through bimolecular pathway. Furthermore, the correlation between deactivation rate and light olefins reveals that the enhancement of propylene selectivity accelerates the deactivation of ZSM-35 and ZSM-22. While, promotion on the ethylene selectivity is a significant inducement for the deactivation of ZSM-5.
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CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Ze Fang,Nan Li,Zhiguo Zhao,Zhexin Zhu,Wangyang Lu,Fengtao Chen,Junjie Wang,Wenxing Chen
Developing efficient and environmentally friendly catalytic system is significant for the removal of sulfide in fuel. O-bridged diiron perfluorophthalocyanine/4-mercaptopyridine (FePcF 16 -O-FePcF 16 /4-Mpy) as a novel composite catalyst was designed and prepared by axial coordination. The catalyst characterization was conducted through ultraviolet–visible spectroscopy, fourier transform infrared spectroscopy, X-ray diffractometry, electrospray ionization–mass spectrometry and density-functional theory technology. A high-efficient extraction oxidative desulfurization system is composed of hydrogen peroxide (H 2 O 2 ), the mixture of ethanol and water and FePcF 16 -O-FePcF 16 /4-Mpy. Notably, the coordination of 4-Mpy greatly enhanced the catalytic activity of FePcF 16 -O-FePcF 16 , 99.4% of the desulfurization rate was achieved in 20 min at 30 °C. The catalyst system was cycled 8 times without significantly reducing the removal of dibenzothiophene. Electron paramagnetic resonance and gas chromatography–mass spectroscopy proved the high-valent iron-oxo intermediates were the main active substances in the FePcF 16 -O-FePcF 16 /4-Mpy/H 2 O 2 system, and the pathway of catalytic oxidation DBT was proposed. This work provided useful insights to select suitable ligands to improve the activity of metal phthalocyanine, and offered a novel idea for the construction of efficient oxidative desulfurization system.
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Gels
·
2021
·Vol. 7
·期 4
·210
·
IF 4.702
Shixian Xiong,Yangbiao Hu,Sizhao Zhang,Yunyun Xiao,Zhengquan Li
Cellulose and its derivative aerogels have attracted much attention due to their renewable and biodegradable properties. However, the significant shrinkage in the supercritical drying process causes the relatively high thermal conductivity and low mechanical property of cellulose and its derivatives aerogels. Considering the pearl-necklace-like skeleton network of silica aerogels, which can improve thermal insulation property and mechanical property. Herein, we propose a new strategy for fabricating cellulose diacetate aerogels (CDAAs) with pearl-necklace-like skeletons by using tert-butanol (TBA) as exchange solvent after experiencing the freezing-drying course. CDAAs obtained have the low density of 0.09 g cm−3, the nanopore size in the range of 10–40 nm, the low thermal conductivity of 0.024 W m−1K−1at ambient conditions, and the excellent mechanical properties (0.18 MPa at 3% strain, 0.38 MPa at 5% strain). Ultimately, CDAAs with moderate mechanical property paralleled to cellulose-derived aerogels obtained from supercritical drying process are produced, only simultaneously owning the radial shrinkage of 6.2%. The facile method for fabricating CDAAs could provide a new reference for constructing cellulose/cellulose-derived aerogels and other biomass aerogels.Keywords:cellulose diacetate;aerogels;freezing drying;pearl-necklace-like skeletons
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ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Xiangyu Tang,Wei Huang,Yanjun Xie,Zefang Xiao,Haigang Wang,Daxin Liang,Jian Li,Yonggui Wang
The research of using bio-based nanocellulose to construct novel structures with tailored functions has attracted wide attention over the past few years. Unlike most of the studies starting with hydrophilic nanoscaled cellulose, undecenoate cellulose esters (UCEs) with different degrees of substitution (DSs) are used in this report to construct (super)hydrophobic coatings. UCE1.9 with a DS of 1.9 is composed of spherical nanoparticles (NPs), which have an average size of 112.8 nm. A crystalline cellulose core is present within UCE1.9 according to solid-state 13C nuclear magnetic resonance (NMR) spectroscopy. Self-assembly turned UCE1.9 NPs into microparticles (MPs) via a solvent-exchange process. The self-assembled UCE1.9 MPs dispersed in ethanol are well distributed on diverse substrates by spray coating to form superhydrophobic surfaces with micro/nanoscale hierarchical structures, which showed static water contact angles larger than 150° and sliding angles less than 10°. The prepared superhydrophobic surface holds its original superhydrophobicity when exposed to acidic or alkaline conditions and high temperatures. Moreover, UCE3 NPs constructed by UCE3 molecule chains with a DS of 3 tremendously enhanced the mechanical stability after addition into UCE1.9 MPs coatings, which was evaluated through sandpaper rubbing and tape peeling tests. Thus, these novel (super)hydrophobic coatings derived from sustainable cellulose are promising candidates for constructing biodegradable superhydrophobic materials.
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