Catalysts
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2021
·Vol. 11
·期 6
·661
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IF 4.146
Xi Lin,Yanxia Li
In order to degrade toxic pollutants such as dyes during the process of sewage treatment, considerable attention has been paid to photocatalytic technologies. In this paper, TiO2/Ag[BMIM]Cl (1-butyl-3-methyl imidazolium chloride ([BMIM]Cl)) nanocomposites were prepared with TiO2as the carrier, silver ions as dopants and ionic liquids (IL) as modifiers. The morphologies, microstructures, crystalline structure and optical properties of the TiO2/Ag[BMIM]Cl nanospheres are investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), total organic carbon (TOC), and UV-vis diffuse reflectance spectrum (UV-vis DRS) techniques. The TiO2/Ag[BMIM]Cl nanocomposites can selectively degrade rhodamine B (Rh B) under visible light because of the unstable quaternary ammonium salt. The as-obtained nanocomposites exhibit better photocatalytic activity performance than pure TiO2, TiO2/IL, and TiO2/Ag+. The experimental results show that the Rh B degradation rate can reach 98.87% under optimized producing conditions by using the TiO2/Ag[BMIM]Cl composites as the catalyzer. It shows that simultaneous doping with silver ions and ionic liquids can significantly improve the photocatalytic activity of TiO2in Rh B degradation, indicating the formation of photosensitive AgCl in the process of TiO2/Ag[BMIM]Cl preparation. Ag+and IL addition exchange the band gap of TiO2and lengthen the visible wavelength range of the composite. The material has the advantages of low cost, facile preparation and reusability with the excellent degradation effect of Rh B.Keywords:TiO2/Ag[BMIM]Cl composites;rhodamine B;visible photocatalytic degradation
研究领域:
环境科学
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 39
·16877-16890
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IF 3.288
Xiangbo Song,Chenguang Wang,Lungang Chen,Qiying Liu,Jianguo Liu,Yuting Zhu,Jun Yue,Longlong Ma
Ionic liquids (ILs) as additives were used in the selective conversion of bio-based carbohydrates to 5-hydroxymethylfurfural (HMF) in this work. The effect of adding various imidazole-based ionic liquids with different anion structures on the production of HMF from fructose was firstly investigated in aqueous media. The presence of 15 wt% 1-butyl-3-methylimidazole chloride ([Bmim]Cl) ionic liquids in water with Fe2(SO4)3 as the homogeneous catalyst provided a more effective HMF synthesis compared to that without [Bmim]Cl addition. The enhanced HMF yield was mainly attributed to the fact that [Bmim]Cl might play a vital role in stabilizing the HMF molecule, which could thereby suppress side reactions involving HMF (e.g., its rehydration to levulinic acid or/and polymerization to humins). NMR and FTIR analyses suggested that such a stabilization effect stemmed from the interaction of [Bmim]Cl with the hydroxyl and aldehyde groups of HMF through hydrogen bonding. By performing the operation in a biphasic system (i.e., with the biomass-derived THF solvent as the organic phase and the addition of NaCl salt into water for improving HMF partition), the HMF yield over the Fe2(SO4)3 catalyst in the presence of the [Bmim]Cl additive could be further improved. The catalyst and ionic liquids were quite stable, and could be reused for more than five cycles with a consistent activity. A similar enhancement effect of [Bmim]Cl was also demonstrated in HMF synthesis with better yields from other biomass feedstocks or derivatives (including glucose, sucrose, cellobiose, inulin and starch) in aqueous media.
研究领域:
化学工程
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催化
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绿色化学
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生物化工
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DOI
高影响因子
Processes
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2021
·Vol. 9
·期 4
·652
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IF 2.847
Huanong Cheng,Na Li,Rui Zhang,Ning Wang,Yuanyuan Yang,Yun Teng,Wenting Jia,Shiqing Zheng
The solubility of hydrogen sulfide in different mole ratios of ferric chloride and 1-butyl-3-methylimidazolium chloride ionic liquid (rFeCl3/[bmim]Cl,r= 0.6, 0.8, 1.0, 1.2, 1.4) at temperatures of 303.15 to 348.15 K and pressures of 100 to 1000 kPa was determined. The total solubility increased with the increase of pressure and the decrease of temperature. The solubility data were fitted using the reaction equilibrium thermodynamic model (RETM). The mean relative error between the predicted value and the measured value was less than 4%. Henry’s coefficient and the equilibrium constant of chemical reaction at each temperature were calculated. Henry’s coefficient first decreased and then increased with the increase of mole ratio, and increased with the increase of temperature. The equilibrium constant of the chemical reaction followed the same law as Henry’s coefficient. The chemical solubility was related to both Henry’s coefficient and the chemical equilibrium constant. H2S had the highest chemical solubility in FeCl3/[bmim]Cl at a mole ratio of 0.6 and a temperature of 333.15 K. The chemical solubility increased with the increase of pressure.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
Journal of Material Cycles and Waste Management
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2023
·Vol. 25
·期 4
·2326-2337
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IF 3.1
Dou Guolan,Zhang Liying
In the present work, mango pit was used to study the feasibility of converting ionic liquid-pretreated biomass into biofuel and activated biochar by using pyrolysis temperature as a key variable. Ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) was used as a green solvent to dissolve mango pit. The impact of [Bmim]Cl on the pyrolysis properties at peak DTG temperature was investigated. Pretreatment with [Bmim]Cl was observed to slightly enhance biochar yield, while somewhat decreasing bio-oil and biogas yields. The yield of hydrogen and methane, as well as the generation of phenolic and alcoholic bio-oils, are increased by [Bmim]Cl pretreatment. [Bmim]Cl pretreatment was determined to promote the formation of pore structure, a greater number of pores were opened, and the BET surface areas increased 24 times. The pyrolysis kinetics were calculated using the DAEM model. The results showed that [Bmim]Cl pretreatment resulted in lower activation energy and a high amount of fraction mass conversion at low temperatures. As a result, the results showed that pyrolysis of [Bmim]Cl-pretreated biomass did not require high temperatures, and that it is possible to convert ionic liquid pretreatment biomass into high-quality biofuel and active biochar by controlling the pyrolysis temperature. Graphical abstract
研究领域:
能源与环境科学
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化学工程
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DOI
高影响因子
Catalysis Science & Technology
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2022
·Vol. 12
·期 6
·1968-1977
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IF 6.177
Yiwen Yang,Haifeng Qi,Zhanwei Xu,Z. Conrad Zhang
In this work, we identified the prevailing catalytically active species evolved from paired PdCl2–CuCl2 in 1-butyl-3-methylimidazolium chloride ([BMim]Cl) that displayed dramatic synergy between the two metal chlorides in catalyzing the hydrolysis of β-1,4-glycosidic bonds in cellulose. Ultraviolet-visible (UV-vis), far infrared (FIR), and electron paramagnetic resonance (EPR) spectroscopy provide clear evidence for the prominent evolutionary pathways to form the catalytically active species. It is observed that the strong synergy between [PdIICl4]2− and [CuIICl4]2− is initiated by the presence of a saccharide. In the absence of a saccharide, the spectroscopic features of [PdIICl4]2− and [CuIICl4]2− in their paired solution show little change with respect to those of individual metal chloride solutions. The evolution of a highly active heterometallic PdII–Cl–CuI complex from paired PdCl2–CuCl2 in the presence of saccharides is revealed by the transition of the FIR absorption peak of PdII–Cl. Glycolaldehyde as the simplest model compound, which is the same as the reducing end group of saccharides, is applied to determine the possible catalytic species. X-ray absorption spectroscopy (XAS) verifies that [CuIICl4]2− is reduced to [CuICl3]2− by glycolaldehyde. The HCl generated from reduced [CuIICl4]2− is also found to contribute to the hydrolysis of cellobiose, serving as another catalytically active species in paired PdCl2–CuCl2/[BMim]Cl. Paired PdCl2–CuCl2 pretreated with glycolaldehyde exhibits dramatically higher activity than direct use of paired PdCl2–CuCl2 in cellobiose conversion. Strikingly, the PdII–Cl–CuI complex is found to be substantially more active than HCl in the hydrolysis of β-1,4-glycosidic bonds as evidenced by the sustained high cellobiose conversion after neutralization of HCl with NaOH.
研究领域:
催化
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化学工程
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材料科学
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分析化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2015
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IF 3.091
Zhihui He,Minjia Meng,Li Yan,Weihua Zhu,Fengquan Sun,Yongsheng Yan,Yan Liu,Shijuan Liu
Highly selective cellulose acetate (CA) blend imprinted membranes for salicylic acid (SA) was prepared by using phase inversion technique with sulfonated polysulfone (SPS) as a functional polymer, polyethylene glycol-4000 (PEG 4000) and ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) as the additives. The membranes were characterized by several techniques including SEM, Raman, contact angle, membrane flux, and SA adsorption–desorption techniques. The SEM micrographs showed that the cross-sectional morphology of CA membranes was affected by polymer blend composition and applications of additives. Compared with the pure CA membrane the CA/SPS(90/10) + [BMIM]Cl membranes showed low contact angle, high membrane flux, strong adsorption capacity and high permeation selectivity. The experimental data of adsorption kinetic for CA/SPS(90/10) + [BMIM]Cl were well fitted to the pseudo-second-order kinetic model using multiple regression analysis. The selectivity coefficients of CA/SPS(90/10) + [BMIM]Cl-MIM for SA in relation to competition analogs p -hydroxybenzoic acid ( p -HB) and phenol were 5.8549 and 5.9062, respectively, which suggested that CA/SPS(90/10) + [BMIM]Cl-MIM had high selectivity and binding affinity for the template SA. Overall results suggest that [BMIM]Cl can be considered as an effective additive for CA imprinted membranes in the treatment of SA-contained water.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2021
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IF 8.198
Huiying Liu,Ruxangul Jamal,Tursun Abdiryim,Rena Simayi,Lielie Liu,Yajun Liu
In this paper, carboxylated cellulose (CLC) dissolved in [BMIM]Cl as a soft template combined with the functional group (−NH2, −SH)-grafted poly(3,4-ethylene dioxythiophene) (PEDOT) derivatives was synthesized by an in situ polymerization method. Structural analysis revealed that CLC increased the degree of conjugation of the polymers in the composites and also led to the formation of the fibrous and sheet structure of the composite. The results of the electrochemical performance measurements revealed that the electrode modified by PEDOT-MeNH2/CLC and PEDOT-MeSH/CLC had detection limits (S/N = 3) of 0.38(0.1–380 μM) and 0.042(0.02–520 μM) for the detection of guanine (G), while for the detection of uric acid (UA), the corresponding detection limits (S/N = 3) were 0.255(5–400 μM) and 0.085(0.4–650 μM). The PEDOT-MeSH/CLC-based electrochemical sensor also possessed a wide linear response with the detection limits of 0.077(0.6–620 μM) and 0.144(0.2–460 μM) for the simultaneous detection of UA and G, respectively.
研究领域:
材料科学
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分析化学
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生物医学工程
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产品关联
DOI
高影响因子
RSC Advances
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2018
·Vol. 8
·期 34
·18784-18791
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IF 2.936
Yuyan Xiao,Xirong Huang
Via heating first and then cooling, binary ionic liquid (IL) mixture of N-methyl-2-pyrrolidonium methylsulfonate ([HNMP][CH3SO3]) and 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) could form a liquid at room temperature. The glass-transition temperature (Tg) characterized by DSC depends on its composition with Tg being as low as −63 °C. The physicochemical properties of the binary IL mixtures also vary with the composition. With the increase of the mole fraction of [Bmim]Cl, the hydrogen-bond accepting ability (β) of the binary IL mixture increases, but the hydrogen-bond donating ability (α) deceases. In this binary IL mixture, fructose could be effectively converted into 5-hydroxymethylfurfural (HMF) at room temperature. The HMF yields at a given time are found to be well correlated with the physicochemical properties of the binary mixture, especially the α and β values. Under specified conditions, the present IL mixture as medium for fructose dehydration into HMF is comparable to the medium formed by ILs and alcohol, where the alcohols have negative effect on the HMF formation.
研究领域:
化学
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材料科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Changhui Zhu,Haiyong Wang,Chilu Cai,Kang Bi,Bijuan Cai,Xiangbo Song,Qiying Liu,Longlong Ma
Biomass-derived 2,5-dimethylfuran (DMF) is an ideal, renewable gasoline additive, and its production with high productivity is highly desirable. A continuous production route was developed to yield DMF from fructose via a tandem strategy, where dehydration catalysts (HY zeolite and niobium phosphate) assisted by 1-butyl-3-methylimidazolium chloride ([BMim]Cl) and hydrodeoxygenation (HDO) catalyst Cu–Ru/C were integrated into one reaction system with γ-butyrolactone (GBL) as the mobile phase. Optimum conditions, such as temperature, H2 pressure, weight hourly space velocity, and [BMim]Cl concentration, were investigated systematically, with an initial HDO study by using 5-hydroxymethylfurfural (HMF) as substrate and subsequent tandem dehydration and HDO to produce DMF with fructose as substrate. Among the conditions, the highest yield of DMF at 55.2% was gained by niobium phosphate and Cu–Ru/C, with the aid of [BMim]Cl in a fixed bed. Meanwhile, [BMim]Cl facilitated fructose dehydration to HMF and also mediated HDO of the resultant HMF by stabilization, which was clarified by 1H NMR and FTIR spectroscopy. Finally, the fact that carbon deposit led to catalyst deactivation was examined thoroughly via a series of characterization techniques. This work achieved continuous DMF production from fructose and laid a foundation for future possible amplification of DMF.
研究领域:
化学工程
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催化
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可再生能源
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生物燃料
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）