INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Hong Peng,Hongwei He,Ling Liu,Limin Shen,Guiming Fu,Yin Wan,Yuhuan Liu,Lifang Hu
Understanding the dissolving selectivity of ionic liquids (ILs) for cellulose , hemicellulose , and lignin in plant cell wall is critical to explore new ILs for efficient pretreatment of lignocellulosic biomass. Here, the bamboo powder was treated at 150 ℃ under microwave irradiation by 1-butyl-3-methylimidazolium chloride (BmimCl) and 1-butyl-3-methylimidazolium acetate (BmimAc) which had the different anions. The recovered bamboo powder and lignin samples were characterized. It indicated that the solubilities of bamboo powder in BmimCl and BmimAc were 27.04 and 7.00 g/100 g IL, respectively. A large amount of polysaccharides , especially hemicellulose, were possibly degraded by BmimCl, resulting in a low recovery rate (24.17 %) of bamboo powder with high content of lignin (41.81 %). The dissolving selectivity of BmimCl for the three main components was in the order: hemicellulose>cellulose>lignin, while that of BmimAc was in a different order: lignin>cellulose>hemicellulose. The dissolving selectivity of BmimAc was less obvious than that of BmimCl. The pretreatment of bamboo powder with BmimCl and BmimAc could greatly improve the yield of reducing sugar. BmimAc performed stronger ability than BmimCl to destroy the crystal structure of cellulose. Both the bamboo lignins extracted by BmimCl and BmimAc were syringyl (S)/guaiacyl (G)/ p -hydroxyphenyl (H) type with different S/G/H ratios of 10.11/5.32/1.00 and 7.61/2.47/1.00, respectively. The lignin extracted by BmimAc was rich in hemicellulose and side alkyl chains. While the β -O-4 bonds in the lignin extracted by BmimCl were seriously broken, leading to the high contents of aliphatic OH, syringyl phenolic OH, and guaiacyl phenolic OH. BmimAc performed weaker ability than BmimCl to damage the lignin structure.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Yixin Sun,Peishan Li,Qi Sun,Xin Liu,Yanping Wang,Bixian Zhang,Shijia Dong,Xiaomei Hu
Ionic liquids (ILs)-assisted microbes and enzymes are potential approaches for converting lignocellulosic biomass into fermentable sugars in a biorefinery. In the present study, an ILs-tolerant strain Aspergillus terreus NEAU-7 with ILs-stable cellulase production ability was isolated and identified. A comparative transcriptome analysis revealed that A. terreus NEAU-7 could promote ion transport and acquire metabolic energy to reduce the adverse effect of ILs. The results further confirmed that the strain could increase the accumulation of compatible solutes to offset the osmotic pressure of ILs and reduce the cell membrane permeability to prevent ILs. A secretome analysis of Carbohydrate-Active Enzymes (CAZymes) showed no significant reduction in the Glycoside Hydrolases (GH) families of cellulolytic enzymes, while a significant reduction was observed for Carbohydrate Esterases (CE) families and Glycoside Hydrolase 43 (encoding α- L -arabinofuranosidases and β-xylosidases), indicating that the presence of ILs could decrease the expression of hemicellulolytic enzymes. Herein, a model for lignocellulose degradation of A. terreus NEAU-7 was interpreted. Overall, this study will provide insights into further exploration of the ILs-resistance mechanism of lignocellulolytic fungi and employment of ILs-assisted fungi in the degradation of lignocellulosic biomass into value-added products.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jiuyan Chen,Yalei Xu,Zhongqin Zheng,Qiqi Wei,Usman Farooq,Taotao Lu,Weifeng Chen,Zhichong Qi
The ionic liquids (ILs) can influence the adsorption of antibiotics on minerals but there was ambiguity about mechanisms. Herein, we demonstrated the adsorption characteristics of ciprofloxacin (CIP) onto ferrihydrite and montmorillonite by various soluble ILs. Five imidazolium-based ILs with different alkyl chain lengths ([C 2 mim]Cl, [C 4 mim]Cl, [C 6 mim]Cl) and counteranions ([C 4 mim][TOS] and [C 4 mim][PF 6 ]) were employed. The results validated that ILs could suppress CIP adsorption on both minerals due to the adsorption site competition between cations and CIP molecules, steric hindrance induced by long alkyl chains of ILs, and electrostatic interaction. Interestingly, the adsorption-inhibition effects of ILs were almost unchanged with the lengthening alkyl chain for ferrihydrite, which were ascribed to the comparable adsorption capacities of the three ILs on ferrihydrite. Whereas, the effects of ILs on CIP adsorption onto montmorillonite followed the order of [C 6 mim]Cl > [C 4 mim]Cl > [C 2 mim]Cl owing to the adsorption site competition and steric hindrance effects on the ILs increased with the lengthening alkyl chain. Furthermore, the inhibitory effects of ILs on CIP adsorption onto both studied minerals were also dependent on the counteranions (kept the same cation ([C 4 mim] + )) and in the following order of [C 4 mim][PF 6 ] > [C 4 mim][TOS] > [C 4 mim]Cl, which was mainly ascribed to the differences of anions in the ion sizes and the binding affinities to minerals. Additionally, the extent of the inhibitory impact of [C 4 mim][TOS] on CIP adsorption onto ferrihydrite declined with increasing solution pH from 5.0 to 9.0, which was attributed to the amounts of adsorbed [TOS] – declined with increasing pH. Contrarily, for montmorillonite, the extent increased with increasing pH, owing to increase in adsorption site competition and steric effect at higher pH conditions. Our findings emphasize the significance of emerging contaminants in understanding the antibiotic environmental behavior in eco-environmental systems.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Xiaomin Yang,Kaijun Quan,Juanjuan Wang,Jianfei Liu,Bei Liu,Jia Chen,Ming Guan,Hongdeng Qiu
The fine-tuning of the pore structure on the mesoscopic scale of dendritic mesoporous silica nanoparticles (DMSNs) is a challenge but very important. In this work, a series of imidazolium ionic liquids (ILs) with different alkyl chain lengths (named CxMImBr: x = 12, 14, 16, 18, 20, and 22, respectively) were synthesized as structure-directing agents based on the highly designable structural advantages of ILs, and the particle size and pore adjustment of DMSNs was investigated. Through the reasonable regulation of alkyl chain length, molar mass, and ratio, it can realize the fine control of monodisperse DMSNs pore size (2–21 nm) and particle size (200–500 nm). On this basis, the pore size and particle size can be further controlled independently by reasonable design of reaction condition. This study provides a controlled way to construct multi-scale and multi-level DMSNs materials.
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Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-15
·
IF 16.419
Xu Jie,Cui Jian,Yang Shaomin,Han Yu,Guo Xi,Che Yuhang,Xu Dongfang,Duan Chenyang,Zhao Wenjing,Guo Kunpeng,Ma Wanli,Xu Baomin,Yao Jianxi,Liu Zhike,Liu Shengzhong
A series of 10 imidazolium-based ionic liquids (IILs) with different cations and anions have applied to unravel the passivation mechanism of the IILs on CsPbI 2 Br inorganic perovskites.
It is found that anions of IILs play a more important role in passivation of lead- and cesium-related defects in inorganic perovskite compared with imidazole cations because they can form strong ionic interactions (Pb-F, Cs-F).
A high-power conversion efficiency of 17.02% is obtained, which is among the highest values of CsPbI 2 Br-based perovskite solar cells.
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高影响因子
Small Methods
·
2021
·Vol. 5
·期 7
·2100505
·
IF 14.188
Yong-Ya Zhang,Nan Zhang,Peng Peng,Rui Wang,Yan Jin,Ya-Kun Lv,Xin Wang,Wei Wei,Shuang-Quan Zang
Design and development of cost-effective electrocatalysts with high efficiency and stability for scalable and sustainable hydrogen production through water splitting is still challenging. Herein, with the aid of divinyl functionalized ionic liquids, uniformly distributed Ru nanoparticles (NPs) on nitrogen-doped carbon frameworks are obtained via an in situ confined polymerization strategy. Attributed to the unique lamellar structure and confinement effect of carbon supports, the optimized homo-PIL-Ru/C-600 (with Ru 10 wt%) catalyst exhibits superior catalytic efficiency for the hydrogen evolution reaction with the overpotential of only 16 mV at a current density of 10 mA cm −2 and the corresponding Tafel slope of only 42 mV dec −1 . Moreover, the performance can be well reserved even after 10 000 cycles, demonstrating excellent stability and promising potentials for industrial application. This work not only provides a facile approach for the preparation of highly efficient Ru-based catalysts, but also guides the synthesis of other highly dispersed metallic NPs for special applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Hongmin Cui,Jinsong Shi,Yanlin Liu,Nanfu Yan,Chao Zhang,Shengyong You,Guihua Chen
As the consumption of rare earth elements (REEs) for many clean energy and consumer electronic sectors continues to grow, recycling REEs is essential due to the limited resources and high economic importance of high-value rare earth (RE). Herein, we describe the development of a novel alkali fusion, acid leaching, and liquid–liquid extraction process for the separation of lutetium from (Lu, Y) 2 SiO 5 (LYSO) scrap using diglycolamide-based task-specific ionic liquids (DGA-TSILs). The comprehensive disintegration of LYSO through alkaline fusion is discussed and subsequently optimized parameters were employed to extract REEs from LYSO under low acidity conditions during hydrochloric acid leaching. Two DGA-TSILs were used for the extraction of Lu(III) and Y(III) from chloride system. McCabe-Thiele diagram was constructed to determine the number of stages needed for the separation of Lu(III) from LYSO leachate, and stripping of Lu(III) from the loaded organic phase was achieved with 0.01 mol/L HCl solution. These results provide a green alternative to conventional methods of strategically important REEs recycling from LYSO scrap.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xia Xiao,Jing-Kai He,Yi-Xin Guan,Shan-Jing Yao
Androst-4-ene-3,17-dione (AD) is an important intermediate of steroid drugs, and the microbial side-chain cleavage of sterols to produce AD by Mycobacterium sp. has attracted much attention. Unfortunately, a low yield of this reaction due to the extremely poor solubility of sterols in aqueous medium is a critical problem. Ionic liquid (IL) as a promising alternative to organic solvents is deemed to increase the solubility of hydrophobic substrates; however, the tolerance of microorganisms to ILs is limited and biocompatible ILs are desperately needed. In this work, cholinium amino acids ([Ch][AA]) ILs were first introduced as cosolvents for the whole-cell bioconversion of phytosterols to produce AD. The physicochemical properties of these novel ILs were investigated on the basis of their structures, and the solubility of phytosterols and AD in [Ch][AA] ILs aqueous solution was determined. The results indicated that moderate cell membrane permeability was obtained by [Ch][AA] ILs, and [Ch][Asp], [Ch][Glu], and [Ch][Gln] showed proper biocompatibility to Mycobacterium sp. MB 3683 cells among 18 kinds of [Ch][AA] ILs. The highest production of AD was achieved in 1% (v/v) [Ch][Asp], which was about twice as high as that in the buffer. Therefore, [Ch][AA] ILs are potential cosolvents in steroid biotransformation to promote medium engineering for a sustainable environment.
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GREEN CHEMISTRY
·
2020
·Vol. 23
·期 1
·592-596
·
IF 9.48
Guiling Shi,Ran Zhai,Haoran Li,Congmin Wang
A highly efficient catalytic system was developed for the reaction between CO2 and propargylic alcohols for alkylidene cyclic carbonates. Ionic liquids (ILs) with different anions and cations were designed as cocatalysts, in order to find out the effect of the cation and the anion on this reaction. The results indicated that the effect of the cation was significant, especially the hydroxyl group on the cation played an important role due to the presence of a hydrogen bond. It was also found that the basicity of the anion was important for its catalytic activity, where the anion with moderate basicity gave the best activity. Moreover, this hydroxyl and azolate dual functionalized catalytic system showed excellent reusability and generality. It is worth mentioning that at a low concentration of CO2, this dual functionalized catalytic system showed excellent catalytic activity even in a gram-scale reaction, indicating its potential in carbon capture and utilization processes.
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RSC Advances
·
2020
·Vol. 10
·期 20
·11643-11651
·
IF 3.119
Qi Xia,Hong Peng,Lin Yuan,Lifang Hu,Yu Zhang,Roger Ruan
The exploration of a highly efficient and environment-friendly solvent for dissolving hemicellulose is significant. In this study, 1-butyl-3-methylimidazolium carboxylate ([Bmim]carboxylate)-based ionic liquids (ILs), including [Bmim]formate, [Bmim]acetate, [Bmim]propionate, and [Bmim]butyrate, were used as solvents to dissolve arabinoxylan-rich hemicellulose from bamboo. The hemicellulose solubility in the ILs was determined as a function of temperature. The interaction between the hemicellulose and the ILs was evaluated by using 1H and 13C NMR techniques. The hemicelluloses regenerated from the saturated IL solutions were characterized. Results showed that the temperature and structure of carboxylate anions deeply affected the hemicellulose solubility. The carboxylate anion played a more important role than the imidazolium cation in hemicellulose dissolution. The hydrogen bond that formed between the ILs and the hydroxyl groups at the XC2 position of xylopyranose units of hemicellulose was stronger than that between the ILs and the hydroxyl groups at XC3 position of xylopyranose units. The hydrogen bond strength between the hemicellulose and the ILs was affected by the alkyl chain of the carboxylate anion and the hemicellulose concentration. The disruption of the inter- and intra-molecular hydrogen bonds in hemicellulose by the ILs was responsible for the hemicellulose dissolution. The main chain of hemicellulose remained nearly unchanged during the dissolution process.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Fusheng Liu,Ran Ping,Yongqiang Gu,Penghui Zhao,Bin Liu,Jun Gao,Mengshuai Liu
CO2 capture and utilization (CCU) have aroused much attention. In this paper, several novel triazolium-based ionic liquids (ILs) were developed for highly efficient transformation of CO2 into quinazoline-2,4(1H,3H)-diones. The catalytic behaviors such as the effects of IL structures and reaction parameters, catalyst recyclability, and scope of substrates were studied in detail. As compared to the reported homogeneous and heterogeneous catalysts, the [HTMG][Triz] with a tetramethylguanidine cation and a triazole anion exhibited an exceptional activity at 50 °C and 1 atm CO2 without any organic solvents. On the basis of the CCU strategy, we first studied the equimolar CO2 capture by the [HTMG][Triz] and one pot conversion of activated CO2 into various quinazoline-2,4(1H,3H)-diones, and good to excellent product yields were obtained. In addition, the catalytic performance for synthesis of quinazoline-2,4(1H,3H)-dione under low concentration of CO2 using a simulated flue gas was studied. The developed triazolium-based ILs could realize simultaneous activation of CO2 and the substrates under ambient conditions, which also have been demonstrated to support the reaction mechanism well. The integrative protocol here shows great significance in the practical synthesis of quinazoline-2,4(1H,3H)-dione and their derivatives from captured CO2 waste under mild conditions.
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Lili Deng,Wenzhong Sun,Zijie Shi,Wei Qian,Qian Su,Li Dong,Hongyan He,Zengxi Li,Weiguo Cheng
The development of stable and efficient catalysts is an attractive topic for green chemistry reactions under mild reaction conditions. In order to improve solvent-free synthesis of cyclic carbonates from urea and diols , a binary catalyst systems of Zn-based and different ionic liquids (ILs) were developed and examined in this study. The yield of ethylene carbonate (EC) could reach to 92.2% in the presence of C 16 mimCl/ZnCl 2 catalyst. Through exploring the structure-activity relationships of cation and anion, it was confirmed that a synergistic effect of cation and anion of catalyst had important influences on urea alcoholysis . Additionally, the controlling step of EC synthesis reaction involving the elimination of an ammonia molecule from intermediates had been revealed by in situ FT-IR. This could afford a guided insight for synthesizing cyclic carbonates with high yield. Furthermore, a possible mechanism for the catalytic process was proposed based on DFT and the experimental results via FT-IR, 1 H-NMR and 13 C NMR analysis, which revealed that not only a probable synergistic effects of cation-anion matters, but also C(2)-H of ILs and Zn 2+ played a key role in accelerating the reaction of urea alcoholysis . This catalytic mechanism study is to provide a preliminary basis to develop novel catalysts for cyclic carbonates from urea and diols through a green synthetic pathway.
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