JOURNAL OF MATERIALS SCIENCE
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2023
·Vol. 58
·期 22
·9181-9195
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IF 4.5
Yu Jiaqi,Li Yuqi,Qin Feng,Lu Shaorong,Yang Chao,Li Yang,Zhou Wei
In this work, 1-aminoethyl-3-methylimidazolium bromide ionic liquid was used to modify the surface of graphene nanosheets (GNs) through “π–π” interaction to achieve good dispersion and conductivity. By introducing ionic liquid-modified graphene nanosheets (IGNs) into the PI matrix, the ultra-lightweight and multifunctional IGNs/PI aerogels were prepared via freeze-drying and thermal imidization. Benefiting from the porous structure and the introduction of conductive IGNs, the IGNs/PI aerogels exhibit excellent electromagnetic wave (EMW) absorption properties, compression properties, thermal insulation properties and thermal stability. Notably, when the volume content of IGNs is 10%, the IGNs/PI-10 aerogels show the best EMW absorption performance with a minimum reflection loss (RL min ) of −24.8 dB at 2.44 mm and an effective absorption bandwidth (EAB) of 3.6 GHz at 3.00 mm. These promising characteristics including excellent EMW absorption, compression properties and thermal insulation endow IGNs/PI aerogels great application prospects as multifunctional EMW absorbers.
Graphical Abstract
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Tenghe Zhang,Yingying Guo,Yu Chen,Xu Peng,Sara Toufouki,Shun Yao
A quaternized chitosan (QCS)@poly(ionic liquid) (PIL) hydrogel adhesive was prepared by in-situ ultraviolet (UV)-induced copolymerization of 1-vinyl-3-butyl imidazolium bromide ([BVIm][Br]) and methacryloyloxyethyl trimethylammonium chloride (DMC) in QCS aqueous solution without using any crosslinkers, which was stably crosslinked by reversible hydrogen bonding together with ion association and exhibited excellent adhesion, plasticity, conductivity and recyclability properties. Moreover, its thermal/pH-responsive behaviors and intermolecular interaction mechanism of thermal-triggered reversible adhesion were discovered, meanwhile good biocompatibility, antibacterial properties, repeated stickiness and degradability were also proved. The results showed that the newly developed hydrogel could make various tissues, organic, inorganic or metal materials adhered tightly within 1 min; after 10 binding-peeling cycles, the adhesive strength to glass, plastic, aluminum and porcine skin still remained beyond 96 %, 98 %, 92 % and 71 % of the original, respectively. The adhesion mechanism involves ion dipole interaction, electrostatic interaction, hydrophobic interaction, coordination, cation-π interaction, H-bonding and van der Waals force. For above merits, the new tricomponent hydrogel is expected to be applied in biomedical field to achieve adjustable adhesion and on-demand peeling.
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Journal of Material Cycles and Waste Management
·
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
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GREEN CHEMISTRY
·
2023
·Vol. 25
·期 12
·4685-4695
·
IF 9.8
Yang Wang,Huan Wang,Lan Chen,Weitao Wang,Zhaohui Yang,Zhimin Xue,Tiancheng Mu
Dissolution of lignocellulose is of significant importance for its utilization and transformation. However, it remains a great challenge to efficiently and rapidly dissolve lignocellulose under mild conditions owing to the significant lack of efficient solvents for lignocellulose dissolution. Herein, robust solvent systems were designed by a combination of ionic liquids (ILs), ethanolamine (EA), and organic superbases for the dissolution of lignocellulose. It was observed that the prepared solvents (denoted as the IL/EA-superbase) could efficiently dissolve lignocellulose at mild temperatures (below 100 °C). In particular, the EmimOAc/EA-DBN system showed the best performance, and the solubility values of Populus tomentosa, sugarcane bagasse and Miscanthus giganteus at 90 °C could reach up to 3.8%, 9.5% and 20% (g per 100 g solvent), respectively. It was revealed that EA-superbase effectively participated in the interaction between ILs and lignocellulose, thus promoting the dissolution process. A systematic study revealed that the good performance of the developed solvents toward lignocellulose dissolution resulted from the synergistic effect of the three constructed components to make the solvent have a suitable capacity for the formation of hydrogen-bonding and an appropriate microstructure.
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ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Ningning Zhu,Kaixuan Xu,Jun Xing,Jun Zhang,Jiangnan Dai
In quasi-two-dimensional (quasi-2D) perovskite films, carriers transport in the cascade structural systems involving various quantum wells (QWs) n, but their efficiency is limited by the severe nonradiative recombination within plentiful n = 1, 2, 3 domains induced by traditional ammonium bromide passivation. Here, we fabricate the quasi-2D films with the elimination of n = 1, 2, 3 domains by introducing the ionic liquid n-butylamine acetate (BAAc) instead of n-butylamine hydrobromide (BABr), which increases the photoluminescence quantum yield (PLQY) and lowers the surface roughness of films. Due to the anion exchange between BAAc and methylamine hydrobromide (MABr), BAAc exhibits a sole passivation effect on methylamine-based perovskites. As a result, the ionic liquid-derived perovskite light-emitting diodes (PeLEDs) display blue emission at 479 nm and show significantly improved performance on external quantum efficiency (EQE) and luminance. Our finding provides insights into the passivating effect of ionic liquid on quasi-2D perovskites and will benefit fabricating PeLEDs with enhanced performance.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Weiwei Zhang,Xiaokuo Shen,Wanzhen Li,Jun Wang,Zhao Kuang,Lin Gui,Yugui Tao,Ping Song,Fei Ge,Longbao Zhu
Drug-resistant bacterial infection is one of the major threats to human health. Multidrug-resistant (MDR) bacteria do not respond satisfactorily to conventional antibiotic treatment. Based on the photothermal effect, molybdenum disulfide (MoS2) nanoparticles, photosensitizer chlorin-e6 (Ce6), and an ionic liquid (IL) were used to construct a multifunctional nanoplatform (MoS2-Ce6-IL), which is responsive to near-infrared light (880 nm) and visible light (660 nm) with combined photothermal and photodynamic bacteriostatic activity. The characterization experiments revealed that the nanoplatform is spherical, with a ζ potential of −14.4 ± 1.1 mV, an overall particle size of about 230 nm, and a photothermal conversion efficiency of 54%. In this study, the treatment regimen was more than 93% effective against MDR Escherichia coli (E. coli) and more than 91% effective against Staphylococcus aureus (S. aureus). It can effectively inhibit MDR bacteria and promote skin wound healing in mice infected with S. aureus. By destroying the bacterial cell membrane and DNA, the nanoplatform interferes with the metabolism of substances and energy in bacterial cells and ultimately causes the death of MDR bacteria. In this study, a multifunctional nanosystem with remarkable bacteriostatic activity was successfully synthesized. The molecular mechanism of multidrug resistance in bacteria was elucidated, laying the foundation for its clinical application.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Shanshan Wang,Chaohu Xiao,Shun Lu,Yuyan Guo,Shang Wu,Hailing Li,Lihua Chen
Solar-driven interface evaporation is promising to alleviate the fresh water scarcity in an economical and sustainable way. However, most of currently reported photothermal conversion materials (PMs) are time-consuming costly, inefficient, or complex preparation process, which causes low utilization efficiency, and difficult to be practical for large-scale application. To solve this problem, a facile and green strategy for preparing hydrogel evaporator (SiO 2 -PILs/starch) by grafting poly(ionic liquid)s onto silica and doping it with starch is proposed. Benefiting from the broad solar absorption ( ca. 91 %), strong hydrophilic, and superb salt tolerance and stain resistance of SiO 2 -PILs/starch. Under 1 sun irradiation, the SiO 2 -PILs/starch achieves a remarkable solar evaporation efficiency of 91.72 % in pure water and 81.45 % in 20 wt% NaCl solution, respectively. In particular, SiO 2 -PILs/starch exhibited outstanding long-term salt stability (8 h) and crystalline salt can be self-cleaned in the dark environment. It is worth noting that the prepared hydrogel also possesses a satisfied evaporation efficiency of 75.84 % in oily wastewater (3 wt% n -hexadecane solution) due to its excellent water retention. These properties of SiO 2 -PILs/starch may provide desperately needed solution for efficient desalination and guaranteed high applicability and durability in practice.
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Carbon Letters
·
2023
·
IF 4.5
Gao Qiuyue,Li Guoru,Kofie Gideon,Chen Biaohua,Yin Fengxiang
A series of ZIF-67-C-IL catalysts were prepared using ZIF-67 and 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([BMIM]NTf 2 ) ionic liquid as precursors. The structure of the catalysts was characterized by XRD, TEM, SEM and XPS. The catalytic performance of the catalysts for the oxygen reduction reaction (ORR) was evaluated in a three-electrode system. The results confirmed that the high-temperature treatment of the precursors resulted in the formation of N, S co-doped carbon-encapsulated Co 9 S 8 nanoparticles. To create N, S co-doped carbon coated Co 9 S 8 nanoparticle catalysts, ionic liquids are used as sulfur and nitrogen sources. The catalytic activity of ORR can be improved using N, S co-doped carbon to prevent the aggregation of Co 9 S 8 nanoparticles. Graphitized and N, S co-doped carbon shells are optimal for achieving high activity stability. Optimal 600-ZIF-67-C(1:1.5)-30IL catalytic activity was observed for ORR. The half-wave potential of ORR was 0.88 V vs. RHE in 0.1 mol L −1 KOH, with a limit current density of 4.70 mA cm −2 . Similar ORR electrocatalytic activity was observed between this catalyst and commercial Pt/C (20 wt%).
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POLYMER
·
2023
·
IF 4.6
Xiaowen Xie,Chenming Liu,Peng Cao,Liangliang Qian,Xianglei Meng,Zhifeng Dai,Yubing Xiong
Polymerization-induced self-assembly (PISA) has been the focus of extensive research as an effective approach to create polymer nanoobjects. However, it still confronts hurdles in terms of nano-object stability and the availability of hydrophilic macromolecular agents. In this study, an innovative and productive approach for developing poly(ionic liquid) (PIL) nano-objects was successfully established through cross-linking polymerization induced self-assembly (CPISA). The suggested approaches employ reversible addition fragmental transfer (RAFT) polymerization of ethylene glycol dimethacrylate (EGDMA) mediated by PIL macromolecular chain transfer agents (macro-CTAs) in selected solvents. Core-cross-linked PIL nanogels with various morphologies such as sphere, fiber, and ring were achieved by varying the molecular weight of PIL macro-CTAs and the solvent. Furthermore, PIL nanogels were demonstrated to be effective catalysts for the cycloaddition reaction between CO 2 and epoxides . This versatile method allows for a controllable manner to produce cross-linked polymer nano-objects. Therefore, the findings have significant potential in the fields of polymer synthesis , nanomedicine and catalysis.
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ACS Sustainable Chemistry & Engineering
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2023
·
IF 8.4
Conghao Sun,Yin Li,Yong Ke,Zhiyan Zeng,Weizhen Liu,Zhang Lin,Liyuan Chai
Beryllium is a very important strategic metal and has been applied in high-tech industries. Since the low beryllium content in minerals, the enrichment technique is a vital aspect of beryllium smelting. In this study, we present a novel protic ionic liquid, 4-Hydroxymethyl-5-methylimidazolium p-Chlorobenzoate ([Hymim][pCb]), as an efficient and environmentally friendly extraction solvent for beryllium preconcentration in aqueous solution. Our research demonstrates that BeII can be captured rapidly with high efficiency, reaching nearly 99.6% within 2 h. By controlling the initial metal concentration and pH condition, we could achieve the selective extraction of beryllium in the presence of other heavy metal ions. Our findings also shed new light on the extraction mechanism established by the material characterizations and density functional theory (DFT) calculation, revealing that metal ions disrupt the proton transfer between the cation and anion in the ionic liquid, leading to metal chelation with the cation and subsequent translation of the anion into an aqueous solution. Overall, our research presents a novel method for the enrichment of beryllium in the smelting process while also expanding the scope of protic ionic liquid applications. The efficient and selective extraction of beryllium demonstrated in this study holds great promise for the advancement of beryllium-related industries.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiaoxia Liu,Ronghao Liu,Yiming Lu,Qian Sun,Wenfeng Xue,Mengmeng Cheng,Yanzhao Yang
Recycling gold from e-waste is not only beneficial to environmental protection, but also to resource sustainability. However, it remains a great challenge due to the limitations of high cost, lengthy balance process and the interference of coexisting metals. Herein, a family of low-cost, nitrogen-rich content and acid-stable imidazolium-based poly(ionic liquid)s, designated as P(nDVB-mVBIMCl)s, were synthesized for recovery of gold from e-waste. The obtained P(2DVB-8VBIMCl)s achieves outstanding adsorption capacity (820.5 mg·g −1 ) and rapid equilibrium time (15 min) and satisfactory reusability (more than 8 cycles). XPS, EDS and ion chromatography revealed that the excellent adsorption performance was attributed to synergistic effect of ion exchange and chemical reduction. In addition, the P(2DVB-8VBIMCl)s showed excellent selectivity for gold in actual e-waste leaching solution, exhibited satisfactory selectivity coefficient for Fe 3+ (1.46 × 10 4 ) and Ni 2+ (1.12 × 10 4 ), obtaining 23.4 karat high-purity gold after calcination. In addition, the P(2DVB-8VBIMCl)s shows its good economic feasibility. Overall, this work provides a feasible adsorbent, which becomes a promising candidate for industrial gold recovery from e-waste.
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FUEL
·
2021
·
IF 6.609
Guojia Yu,Xiaojia Wu,Lu Wei,Zhiyong Zhou,Wei Liu,Fan Zhang,Yixin Qu,Zhongqi Ren
Ionic liquids (ILs) are highly efficient green solvents for the removal of thiophene sulfides. Several acidic ionic liquids (ILs) were synthesized with N-formylmorpholine (NFM) as cation and formic acid (HCOOH), sulfuric acid (H 2 SO 4 ), p-toluenesulfonic acid (Tos), trifluoroacetic acid (TFA) as anions. [NFM][TFA] was selected in one-pot extraction-oxidative desulfurization process. The initial sulfide concentrations, competition with olefins and aromatics and the desulfurization mechanism were explored. When V IL /V oil = 1:20, O/S = 3, 60 °C, the desulfurization efficiency of DMDBT and DBT were 99.82% and 99.67% in 30 min, respectively. After recycling five times, the desulfurization efficiency of [NFM][TFA] for DBT could maintain over 98%. When the initial real diesel concentration of 535 ppm and 298 ppm, the desulfurization efficiencies of real diesel were 44.42% and 56.46%, the values increased to 85.73% and 92.13% after extraction and re-extraction by [DBU][Pr]. The mechanism of desulfurization process was proposed that [NFM][TFA] reacted with H 2 O 2 to form corresponding peroxyacid transition state, and DBT in IL phase was oxidized to the corresponding sulfones.
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