BIORESOURCE TECHNOLOGY
·
2014
·
IF 5.039
Yanjuan Zhang,Qian Li,Jianmei Su,Ye Lin,Zuqiang Huang,Yinghua Lu,Guosong Sun,Mei Yang,Aimin Huang,Huayu Hu,Yuanqin Zhu
A new technology for the pretreatment of natural cellulose was developed, which combined mechanical activation (MA) and metal salt treatments in a stirring ball mill. Different valent metal nitrates were used to investigate the changes in degree of polymerization (DP) and crystallinity index (CrI) of cellulose after MA + metal salt (MAMS) pretreatment, and Al(NO 3 ) 3 showed better pretreatment effect than NaNO 3 and Zn(NO 3 ) 2 . The destruction of morphological structure of cellulose was mainly resulted from intense ball milling, and the comparative studies on the changes of DP and crystal structure of MA and MA + Al(NO 3 ) 3 pretreated cellulose samples showed a synergistic interaction of MA and Al(NO 3 ) 3 treatments with more effective changes of structural characteristics of MA + Al(NO 3 ) 3 pretreated cellulose and substantial increase of reducing sugar yield in enzymatic hydrolysis of cellulose. In addition, the results indicated that the presence of Al(NO 3 ) 3 had significant enhancement for the enzymatic hydrolysis of cellulose.
研究领域:
生物化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2018
·
IF 4.521
Xiaoqian Guo,Feng Guo,Yishan Li,Zhangqin Zheng,Zhexu Xing,Zihan Zhu,Ting Liu,Xin Zhang,Ying Jin
Dehydration of D-xylose to yield furfural was carried out using bimetallic salts of a heteropolyacid as the catalyst at 160–220 °C in the DMSO/H 2 O mixtures. The effect of Sn/Cs molar ratio of the bimetallic salts of 12-tungstophosphoric acid (PW) obtained by ultrasound-assisted coprecipitation on dehydration of D-xylose was investigated. The resultant catalysts were characterized by X-ray diffraction, N 2 adsorption, field emission scanning electron microscopy and energy dispersive X-ray (EDX). It was found that the Sn-Cs codoped PW catalysts retained the Keggin crystal structure of PW. Sn 0.625 Cs 0.5 PW was the most active catalyst in the dehydration of D-xylose into furfural. The maximum D-xylose conversion (close to 100 wt %) and furfural yield (63 wt %) were achieved at 200 °C for 3 h in DMSO/H 2 O mixtures. It was found that 16.7 wt % Sn 0.625 Cs 0.5 PW on a chitosan-derived support displayed similar catalytic activity to that of Sn 0.625 Cs 0.5 PW and good stability after recycling six times.
研究领域:
化学工程
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催化材料
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产品关联
DOI
高影响因子
Catalysts
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2016
·Vol. 6
·期 9
·143
·
IF 2.964
Lincai Peng,Ruili Tao,Yu Wu
Levulinate ester has been identified as a promising renewable fuel additive and platform chemical. Here, the use of a wide range of common metal salts as acid catalysts for catalytic upgrading of biomass-derived furfuryl alcohol to butyl levulinate was explored by conventional heating. Both alkali and alkaline earth metal chlorides did not lead effectively to the conversion of furfuryl alcohol, while several transition metal chlorides (CrCl3, FeCl3, and CuCl2) and AlCl3exhibited catalytic activity for the synthesis of butyl levulinate. For their sulfates (Cr(III), Fe(III), Cu(II), and Al(III)), the catalytic activity was low. The reaction performance was correlated with the Brønsted acidity of the reaction system derived from the hydrolysis/alcoholysis of cations, but was more dependent on the Lewis acidity from the metal salts. Among these investigated metal salts, CuCl2was found to be uniquely effective, leading to the conversion of furfuryl alcohol to butyl levulinate with an optimized yield of 95%. Moreover, CuCl2could be recovered efficiently from the resulting reaction mixture and remained with almost unchanged catalytic activity in multiple recycling runs.Keywords:biofuel;furfuryl alcohol;catalytic upgrading;metal salt;levulinate ester
研究领域:
化学工程
·
可再生能源
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产品关联
DOI
高影响因子
Science China-Chemistry
·
2025
·
IF 9.7
Liang Li Ya,Wang Xiao Yuan,Gao Ya Ting,Wu Da Jun,Li Da Wei,Chen Bin Bin
Ordinary metal salts have become a promising afterglow material because of the characteristics of wide sources, low cost, and easy availability. However, their extremely weak afterglow efficiency makes them rarely used in practical applications. In this study, we proposed a ligand engineering strategy to greatly enhance the afterglow efficiency of metal salts. Al 2 (SO 4 ) 3 , as a typical metal salt, has only a photoluminescence quantum yield (PL QY) as low as 0.1% and an unmeasurable phosphorescent QY. After doping with dual organic ligands, the PL QY of Al 2 (SO 4 ) 3 has increased by nearly 200 times, reaching 19.90%. Meanwhile, the afterglow intensity of Al 2 (SO 4 ) 3 has increased by approximately 20 times, accompanied by a great increase in phosphorescent lifetime from 416.15 to 2870.08 ms (a about 7-time increase). The enhancement mechanism of afterglow efficiency is ascribed to the fact that the excited electrons from the dual ligands can be directly captured by oxygen defects (trap), then transferred to the emitters (Al 3+ ions), and ultimately achieving efficient afterglow luminescence. This study utilizes ligand engineering strategy to improve the afterglow luminescence efficiency of metal salts, achieving their applications in deep ultraviolet (UV)-excited light emitting devices and visual ethylene glycol recognition.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
Journal of Natural Fibers
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2022
·
IF 3.507
Haibing Cheng,Lei Zhong,Weini Jia,Xiaoli Zhang,Qinghui Mao,Zhijie Liang
Polyoxometalate-based composite materials have recently attracted extensive attention due to their unique structural characteristics and physicochemical properties. In the present work, a flexible anti-UV blocker compatible with cotton fabric was prepared by simple covalent bond self-assembly of carboxyl group (−COOH) and phosphomolybdate. The resultant cotton fabrics were investigated and confirmed by FT-IR, PXRD and SEM-EDS, demonstrating the successful preparation of polyoxometalate-based composite fabric. The UV spectrum of as-designed composite fabric imparts excellent UV absorption capacity and the UPF value reaches 397.19, which is far superior to original cotton (7.09). Furthermore, the blocker was tested on the photosensitive material in direct UV irradiation, which proved its outstanding performance as a flexible, wearable, and visualized UV blocker. In addition, the experimental results confirmed that the prepared composite material exhibited an excellent and stable UV resistant performance (UPF: 100+) after 5 days UV aging irradiation and five times washing. The proposed fabrication strategy could promisingly endow polyoxometalate-based fiber materials with extensive applicability potential.
研究领域:
材料科学
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纺织工程
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产品关联
DOI
高影响因子
Jove-Journal of Visualized Experiments
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2022
·
IF 1.424
Wei Zhu,Weihua Chu
Hydrogen sulfide (H2S) is a toxic gas produced by bacteria in the proteolysis of sulfur-containing amino acids and proteins that plays an important role in human health. The H2S production test is one of the important bacterial biochemical identification tests. The traditional methods are not only tedious and time-consuming but also prone to inhibition of bacterial growth due to the toxic effect of heavy metal salts in sulfur-containing medium, which often leads to negative results. Here, we established a simple and sensitive method to detect H2S in bacteria. This method is a modified version of bismuth sulfide (BS) precipitation that uses 96-well transparent microtiter plates. Bacterial culture was combined with bismuth solution containing L-cysteine and cultivated for 20 min, at the end of which a black precipitate was observed.The visual detection limit for H2S was 0.2 mM. Based on the visual color change, the simple, high-throughput, and rapid detection of H2S producing bacteria can be achieved. In summary, this method can be used to identify H2S production in bacteria.
研究领域:
微生物学
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医学检验
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2021
·Vol. 11
·期 56
·35408-35414
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IF 3.361
Jianhui Zhu,Desheng Liu,Changsheng Li,Bingjie Zhang,Jianli Wang,Wenjuan Wu,Jiawen Ji,Yongqiang Ma
Organic pollutants widely exist in the environment, causing a lot of potential harm. On account of excellent physical and chemical properties, graphdiyne (GDY) has been widely used in many potential fields. However, it is crucial to develop more synthetic methods to achieve mass production of GDY and explore its universality in the removal of organic pollutants. Herein, six transition metal salts including Cu salts and Pd salts were selected as catalysts to successfully synthesize GDY with different morphologies by a coupling reaction. The method is simple, safe, easy to operate and suitable for large-scale production. Among them, CuSO4-catalyzed GDY has higher yield (>90%), lower density and fewer defects. Furthermore, it can efficiently remove organic pollutants from water such as dyes, tetracycline antibiotics and neonicotinoid pesticides, demonstrating that the adsorption material has a certain universality. In particular, the adsorption effect of GDY on dye is comparable to that of MWCNTs and stronger than that of conventional adsorbents such as graphene and activated carbon. This work provides more possibilities for the industrial production of GDY and its promising application for the removal of organic pollutants.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2017
·Vol. 11
·期 2
·205-210
·
IF 1.712
Zhou Shenghui,You Kuiyi,Yi Zhengming,Liu Pingle,Luo He’an
Metal salts with highly electronegative cations have been used to effectively catalyze the liquid-phase nitration of benzene by NO 2 to nitrobenzene under solvent-free conditions. Several salts including FeCl 3 , ZrCl 4 , AlCl 3 , CuCl 2 , NiCl 2 , ZnCl 2 , MnCl 2 , Fe(NO 3 ) 3 ∙9H 2 O, Bi (NO 3 ) 3 ∙5H 2 O, Zr(NO 3 ) 4 ∙5H 2 O, Cu(NO 3 ) 2 ∙6H 2 O, Ni (NO 3 ) 2 ∙6H 2 O, Zn(NO 3 ) 2 ∙6H 2 O, Fe 2 (SO 4 ) 3 , and CuSO 4 were examined and anhydrous FeCl 3 exhibited the best catalytic performance under the optimal reaction conditions. The benzene conversion and selectivity to nitrobenzene were both over 99%. In addition, it was determined that the metal counterion and the presence of water hydrates in the salt affects the catalytic activity. This method is simple and efficient and may have potential industrial application prospects.
研究领域:
化学工程
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催化化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2024
·Vol. 14
·期 3
·718-727
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IF 4.4
Changqu Lin,Yunlin Shi,Lulu Xu,Zhengyue Wang,Lili Zhao,Hongli Wu,Fei Cao,Ping Wei
Efficient and selective isomerization of glucose into fructose is the most crucial process of biorefining. Despite its rapid isomerization rate under low-temperature conditions, alkali-catalyzed glucose isomerization is less attractive due to the occurrence of extremely complex side reactions. Herein, we explored an approach for promoting the efficiency of alkali-catalyzed glucose isomerization into fructose by adding alkaline earth metal salts. Kinetic analysis showed that the addition of alkaline earth metal salts increased the Ea of fructose degradation from 35.99 to 74.04 kJ mol−1 and decreased the Ea of glucose conversion from 40.35 to 24.62 kJ mol−1. Adding alkali earth metal salts simultaneously stabilized fructose and promoted glucose isomerization. 70.3% fructose yield with 99% fructose selectivity can be achieved in 0.011 g mL−1 Ca(OH)2/0.5 g mL−1 CaCl2 solution at 50 °C for 25 min. From the DFT calculation and DOSY NMR characterization, we inferred that the interaction of CaCl2 with glucose can reduce the energy barrier of glucose ring opening, and the complexation between CaCl2 and fructose maintains the stability of fructose. Meanwhile, 1H NMR titration revealed that the addition of CaCl2 dramatically promoted the conversion of α-glucopyranose to β-glucopyranose. This alkali-salt-catalyzed glucose isomerization is simple and efficient, providing a new strategy for preparing platform chemicals from glucose.
研究领域:
生物化学
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催化化学
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产品关联
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 10
·2336
·
IF 3.2
Xishi Wu,Zehua Liu,Bingbing Pei,Haibo Wu,Zhengren Huang
In this work, the metal salts were introduced into the resin-solvent gel system to leverage their ortho-substitution effect, thereby accelerating the polymerization-induced phase separation process. Subsequent in-situ carbonization resulted in the preparation of porous carbon materials with three-dimensional interconnected pores. By precisely tuning the parameters of the resin-solvent-metal ion system, control over the pore structure of the porous carbon was achieved, with a porosity range of 16.5% to 66.5% and a pore diameter range of 8 to 248 nm. The addition of metallic salts can simply and effectively increase the pore structure after carbonization, making the infiltration of molten silicon easier. This is beneficial to the joining process of silicon carbide ceramics. Based on these findings, a high-reliability joining technique for large-sized (135 mm × 205 mm) silicon carbide ceramics was developed. The resulting interlayer was dense and defect-free, exhibiting a joining strength of 309 ± 33 MPa and a Weibull modulus of 10.67. These results highlight the critical role of structured porous media in advancing the field of large-sized ceramic joining.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2020
·
IF 2.87
Bowen Li,He Xiong,Yang Xiao,Juncheng Hu,Xin Zhang,Li Li,Ruoheng Wang
Porous carbons (PCS) derived from sodium lignin sulfonate were activated by four common metal salts. The samples exhibit distinct characteristics of irregular, sunflower-like, interconnected sheet, and tine block morphologies under the impact of NaCl, CaCl2, ZnCl2, and FeCl3, respectively (PCS-MClx). Surprisingly, the maximum and minimum specific surface areas are 1524 and 44 m2/g corresponding to PCS-ZnCl2 and PCS-NaCl. All of the samples have plentiful functional groups; herein, PCS-NaCl and PCS-FeCl3 are detected with the highest O and S contents (11.85, 1.08%), respectively, which signifies sufficient active sites for adsorption. These porous materials were applied in toluene adsorption from paraffin liquid and matched the Langmuir isotherm models well. Thus, the activation mechanism was discussed in detail. PCS-MClx has a completely different pyrolysis behavior according to thermogravimetry/derivative thermogravimetry (TG/DTG) analysis. It is speculated that H[ZnCl2(OH)] would have an etching effect on the carbon structure of PCS-ZnCl2, and HCl or H2SO4, resulting from FeCl3 hydrolysis and a reduction reaction, would be corrosive to the sodium lignin sulfonate (SLS) surface. Each metal salt plays a different role in activation. The devised method for the synthesis of porous carbons is green and economical, which is suited to mass production.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Biotechnology for Biofuels
·
2019
·Vol. 12
·期 1
·1-15
·
IF 5.452
Zhang Yanjuan,Huang Min,Su Jianmei,Hu Huayu,Yang Mei,Huang Zuqiang,Chen Dong,Wu Juan,Feng Zhenfei
Background Due to biomass recalcitrance, including complexity of lignocellulosic matrix, crystallinity of cellulose, and inhibition of lignin, the bioconversion of lignocellulosic biomass is difficult and inefficient. The aim of this study is to investigate an effective and green pretreatment method for overcoming biomass recalcitrance of lignocellulose.Results An effective mechanical activation (MA) + metal salt (MAMS) technology was applied to pretreat sugarcane bagasse (SCB), a typical kind of lignocellulosic biomass, in a stirring ball mill. Chlorides and nitrates of Al and Fe showed better synergistic effect with MA, especially AlCl3, ascribing to the interaction between metal salt and oxygen-containing groups induced by MA. Comparative studies showed that MAMS pretreatment effectively changed the recalcitrant structural characteristics of lignocellulosic matrix and reduced the inhibitory action of lignin on enzymatic conversion of SCB. The increase in hydroxyl and carboxyl groups of lignin induced by MAMS pretreatment led to the increase of its hydrophilicity, which could weaken the binding force between cellulase and lignin and reduce the nonproductive binding of cellulase enzymes to lignin.Conclusion sMAMS pretreatment significantly enhanced the enzymatic digestibility of polysaccharides substrate by overcoming biomass recalcitrance without the removal of lignin from enzymatic hydrolysis system.
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）