JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 8
·1-20
·
IF 2.253
Khanam Zeba,Liu Jianghe,Song Shenhua
Herein, an efficient, facile, scalable production of graphene dispersions via exfoliation of graphite in an environment-friendly PVA/H 2 O solvent system is reported. To warrant the impact of processing parameters on exfoliation efficiency, a systematic investigation is carried out using UV–visible spectroscopy. Under the optimal shearing parameters (1 h, 10 k rpm) with the PVA-to-fed graphite mass ratio of 10, a high concentration graphene dispersion (3.36 mg mL −1 ) is achieved. The estimated graphene yield is found to be 33% that further increases to 90% after sediment recycling. With the aim of detailed quality analysis, centrifugal cascading is adopted to predominately sort the graphene flakes from the upper end of the distribution. Through various characterization techniques, it is confirmed that the resulting dispersion comprises high-quality graphene flakes (1–5 layers) having thickness up to 1.48 nm, lateral dimension ranging from 0.3 to 4 µm, and quite a low level of defects ( I D / I G = 0.1). The statistical distribution histogram reveals that most flakes are single-layer (41%), including some bi-layer (21%) and tri-layer (28%), while the remaining can be said five or multi-layer graphene. Meanwhile, the efficacy of the PVA/H 2 O solvent system is also demonstrated using ultrasonic exfoliation, providing a high concentration of graphene (1.1 mg mL −1 ) in a relatively short time (8 h). Furthermore, the applicability of the PVA-stabilized graphene dispersion is addressed by fabricating various graphene products such as graphene paper electrodes, graphene composites, and graphene thin films. Impressively, the graphene paper electrode imparts an exceptionally high specific capacitance of 199.63 F g −1 in a potential window range of 0 to 2 V, and hence could be a promising alternative to traditional electrodes in supercapacitors. Conclusively, the exfoliation of graphite in a green polymer–solvent system offers to produce highly concentrated graphene dispersions at a minimal cost that could be widely applicable in different research areas, thus holding the potential for commercial viability.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hyewon Jeon,Taehun Kim,Paula Jungwon Choi,Am Jang
With growing interest in hydrogen energy, liquid ammonia has emerged as a promising hydrogen carrier due to its low boiling point and high volumetric energy density. In addition to green and brown ammonia, white ammonia, produced through waste recycling, has gained attention. This study explored the use of a Janus membrane in a membrane contactor system for white ammonia recovery from high-strength wastewater, such as anaerobic digestion effluent, which is prone to membrane fouling owing to its complex organic and inorganic constituents. To address the challenge, a Janus membrane with asymmetric wettability, combining a hydrophilic surface and a superhydrophobic layer, was used to enhance interfacial stability and ammonia transport. The Janus membrane achieved a mass transfer coefficient (MTC) of 0.039 m/h, which was 8.3 % higher than that of the SHPO-only membrane and exhibited only a 5.13 % MTC reduction after extended fouling, compared to a 20.93 % reduction for the virgin membrane. Postoperative Fourier transform-infrared and X-ray photoelectron spectroscopy analyses confirmed the chemical integrity of both layers, and scanning electron microscopy imaging revealed limited surface deposition. In addition, the Janus configuration enabled directional vapor flow and reduced interfacial mass transfer resistance compared with symmetric membranes. The findings demonstrate that the Janus membrane provides a robust and scalable platform for stable ammonia separation in the presence of severe fouling and complex wastewater matrices.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Xiao Zhao,Baojie Liu,Hao Xu,Chengrong Qin,Shuangquan Yao,Chen Liang,Shuangfei Wang
Elemental Chlorine-Free (ECF) bleaching is a globally prevalent pulping technology that primarily utilizes chlorine dioxide (ClO 2 ) as a bleaching agent. However, the chlorination side reactions during ECF bleaching lead to the formation of chlorinated adsorbable organic halides (AOX), which are difficult to degrade and pose a potential threat to the ecological environment. This study presents a novel high-concentration ClO 2 pulping bleaching technology at room temperature, which effectively suppresses the chlorination side reactions through the strong oxidizing properties of high-concentration ClO 2 , thereby achieving both bleaching and a reduction in AOX generation. The results indicate that high concentrations of ClO 2 efficiently removed residual lignin from the pulp, promoted the cleavage of lignin ether bonds, and had no adverse impact on the strength or crystalline structure of the cellulose. The amount of AOX was effectively controlled to 0.41 kg/t pulp. Kinetic analysis demonstrated that the degradation of lignin in this bleaching system follows first-order reaction kinetics, with an activation energy of 1310.78 J/mol. Approximately 95 % recovery of the ClO 2 solution was achieved through a four-step reabsorption method. This technology advances the development of pulping and bleaching techniques and provides theoretical guidance for the innovation of cleaner pulping and papermaking technologies.
研究领域:
制浆与造纸工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2015
·Vol. 91
·期 5
·1562-1568
·
IF 2.349
Chao Song,Xue-Fei Sun,Yun-Kun Wang,Peng-Fei Xia,Fang-Hui Yuan,Jia-Jia Li,Shu-Guang Wang
BACKGROUND Tetracycline (TC), a group of broad-spectrum synthetic antibiotics, has been detected in wastewater at concentrations ranging from ng L −1 to mg L −1 . However, low biodegradation efficiencies of TC, especially at high concentrations, were obtained in conventional activated sludge processes. This study aimed to investigate the biodegradation and behavior of TC at high concentrations in an enriched mixed culture system. RESULT High TC removal efficiencies of 83.6 ± 4.3% and 93.2 ± 2.2% were obtained in two reactors with the addition of TC at 10 mg L −1 and 1 mg L −1 , respectively. In the presence of TC, activated sludge floc size kept increasing and aggregation phenomena were observed. In addition, TC exposure decreased the microbial diversity and enriched the dominant bacteria. These effects were more prominent with higher TC concentration. CONCLUSION TC at high concentrations could be effectively removed in enriched mixed culture, and biodegradation was the primary mechanism. TC induced the aggregation of activated sludge and the effect was more prominent under higher TC stress. The TC exposure affected the microbial communities of activated sludge, resulting in a decrease in microbial diversity and the enrichment of dominant bacteria. © 2015 Society of Chemical Industry
研究领域:
环境科学
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微生物学
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DOI
高影响因子
Greenhouse Gases-Science and Technology
·
2022
·Vol. 12
·期 3
·362-375
·
IF 2.518
Jinxiu Li,Yu Li,Chen Li,Rui Tu,Pengfei Xie,Yi He,Yao Shi
While nonaqueous organic-amine absorbents have great potential in reducing energy consumption of CO 2 capture, their absorption/desorption behaviors are still poorly understood when high-concentration polyamines are used. On the other hand, large scale CO 2 capture demands the use of high-concentration polyamines absorbents. Therefore, we investigated the absorption and microwave regeneration behavior of high-concentration triethylenetetramine (TETA) in three typical organic solvents, including polyethylene glycol 200 (PEG200), diethylene glycol (DEG), and ethylene glycol (EG). The results showed that high-concentration TETA nonaqueous absorbents demonstrate advantages in absorption rate and regeneration energy consumption. The average absorption rate of 2.0 and 5.0 mol/L TETA/EG was 2.84 and 4.70 times that of 0.6 mol/L, respectively. The energy consumption of TETA/EG and TETA/DEG decreased by 29.4 and 25.6% as the concentration increased from 0.6 to 5.0 mol/L. In addition, the high-concentration TETA/PEG200 absorbent demonstrated observable tolerance for water vapor, which usually exists in flue gas. Results also showed that microwave regeneration was superior to conventional conduction heating especially when high-concentration TETA/PEG200 absorbent were used. The energy consumption of microwave regeneration of the absorbent with a concentration of 0.6, 2.0, and 5.0 mol/L was reduced by 65.9, 81.2, and 86.0%, respectively when compared with conduction heating. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhanlin Yang,Guolin Hu,Chenyu Wang,Yuansheng Lin,Zhichao Shi,Jianhui Chen,Yongchuan Liu,Jie Shen,Cuilian Wen,Xiangxin Zhang,Yuanqiang Chen,Baisheng Sa
Localized high-concentration electrolytes (LHCEs) offer a new methodology to improve the functionality of conventional electrolytes. Understanding the impact of antisolvents on bulk electrolytes is critical to the construction of sophisticated LHCEs. However, the mechanism of how antisolvent modulates the electrochemical reactivity of the solvation structure in LHCEs remains unclear. In this work, the key correlation between the physicochemical properties of antisolvents and their corresponding Lithium-ion battery (LIBs) systems has been elucidated by comprehensive multiscale theoretical simulations combined with experimental characterizations. Nine antisolvents (chain ethers and cyclic non-ethers) are investigated in a typical lithium bis(fluorosulfonyl)imide/1,2-dimethoxymethane (LiFSI/DME) system. It is highlighted that the relative molecular masses of antisolvents in the same class are positively correlated with the density. The viscosity of a liquid mixture consisting of DME and antisolvent in the same class is positively correlated with the magnitude of the interaction energy between them. Additionally, the self-diffusion coefficient of Li + is also positively correlated with the sum of the interaction energies between Li + -DME and Li + -FSI − , which is also affected by the class of antisolvent. These results provide deep insights into the behavior and properties of LHCEs, which help to advance the design of high-performance LIBs.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jinxiu Gu,Xiaopeng Li,Shaofei Shi,Juanjuan Wang,Xue Han,Conghua Lu
Iodide-based redox supercapacitors (SCs) can increase the specific capacitance of conventional SCs by introducing redox species in the electrolyte. However, the rapid shuttling effect of I - /I 3 - would exacerbate the self-discharge behavior of the redox SCs. Herein, we developed a novel composite electrolyte solution consisting of 0.1 M potassium iodide (KI) and highly concentrated salt (e.g., 9 M potassium acetate (KAc)), which is used for the assembly of iodide-based redox SCs. The composite electrolyte solution not only extends the operating voltage of the aqueous redox SCs to 2.0 V, but also leads to a low self-discharge rate. Specifically, at 1.6 V, the self-discharge rate of the 9 M KAc-based SCs decreases from 62.58 to 19.58 mV/h, compared to the 1 M KAc-based SCs. Meanwhile, the suppressed shuttling effect of I - /I 3 - by highly concentrated salt solution is well studied by in-situ UV–vis absorption spectrum, viscosity, conductivity, Raman spectroscopy, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. It is concluded that highly concentrated electrolyte can limit the diffusion of active species and thus transform the self-discharge mechanism from an activation-controlled faradaic reaction to a diffusion-controlled faradaic reaction. This work not only deepens understanding the working mechanism of highly concentrated composite electrolyte for alleviating the self-discharge of redox SCs, but also opens a new universal avenue to fabricate good cycling stability and high performances of redox SCs.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 11
·2475
·
IF 3.267
Yanliang Yang,Dexi Yang,Chi Zhang,Min Zheng,Ying Duan
The development of a simple and durable catalytic system for the production of chemicals from a high concentration of a substrate is important for biomass conversion. In this manuscript, 5-hydroxymethylfurfural (HMF) was converted to 1-hydroxy-2,5-hexanedione (HHD) using the combination of commercial Pd/C and acetic acid (AcOH) in water. The influence of temperature, H2pressure, reaction time, catalyst amount and the concentration of AcOH and HMF on this transformation was investigated. A 68% yield of HHD was able to be obtained from HMF at a 13.6 wt% aqueous solution with a 98% conversion of HMF. The resinification of intermediates on the catalyst was characterized to be the main reason for the deactivation of Pd/C. The reusability of the used Pd/C was studied to find that most of the activity could be recovered by being washed in hot tetrahydrofuran.Keywords:HMF;1-hydroxy-2,5-hexanedione;acetic acid;Pd/C;high concentration
研究领域:
化学工程
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生物质转化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2019
·
IF 3.782
Yu Juan,Gao Na,Peng Jiaxin,Ma Nani,Liu Xiaoyan,Shen Chao,Xie Keyu,Fang Zhao
Nowadays, lithium (Li) metal batteries arouse widespread concerns due to its ultrahigh specific capacity (3,860 mAh g−1). However, the growth of Li dendrites has always limited their industrial development. In this paper, the use of concentrated electrolyte with lithium difluoro(oxalate)borate (LiODFB) salt in 1, 2-dimethoxyethane (DME) enables the good cycling of a Li metal anode at high Coulombic efficiency (up to 98.1%) without dendrite growth. Furthermore, a Li/Li cell can be cycled at 1 mA cm−2 for over 3,000 h. Besides, compared to conventional LiPF6-carbonate electrolyte, Li/LiFePO4 cells with 4 M LiODFB-DME exhibit superior electrochemical performances, especially at high temperature (65°C). These outstanding performances can be certified to the increased availability of Li+ concentration and the merits of LiODFB salt. We believe that the concentrated LiODFB electrolyte is help to enable practical applications for Li metal anode in rechargeable batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Yushan Shao,Mingguang Han,Yingqi Wang,Guannan Li,Wu Xiao,Xiangcun Li,Xuemei Wu,Xuehua Ruan,Xiaoming Yan,Gaohong He,Xiaobin Jiang
Vacuum membrane distillation (VMD) is a promising technology for high salinity wastewater treatment . One of the key issues in VMD research is improving the antifouling performance of the hydrophobic porous membrane under proper interface modification theory and approach. In this work, the polypropylene (PP) composite membrane coated with SiO 2 nanoparticles and fluorinated modification was fabricated to simultaneously enhance the interface roughness and superhydrophobicity. The fabricated superhydrophobic PP membrane was then applied to treat highly concentrated NaCl (15 wt%)/MgCl 2 (from 3 to 9 wt %) saline solution in VMD process under various flow conditions. The model concerning the surface roughness and surface nucleation free energy was constructed to predict the influence of membrane surface structure on potential anti-fouling and anti-wetting properties. Classical heterogeneous nucleation theory was introduced to illuminate the improved performance of developed membrane with targeted surface morphology on inhibiting the initial interfacial nucleation process. The experimental results illustrated the fabricated superhydrophobic PP membrane exhibited unique anti-fouling and anti-wetting abilities, as well as extremely stable permeating flux even under low feed rate and highly concentrated salt solution system during the continuous operation. In addition, it was also indicated that sodium ion and magnesium ion with distinct features in the structure of water-ion solution system had the potential impact on the permeate flux decline and concentration polarization effect, which was helpful for further improving the stability and durability of this series modified membrane when treating the high concentrated multiple solution system.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Tingting Feng,Guozhu Yang,Shu Zhang,Ziqiang Xu,Haiping Zhou,Mengqiang Wu
Using localized high-concentration electrolytes (LHCEs), which have high oxidation resistance and low viscosity, in high-voltage lithium-ion batteries can facilitate the low-temperature operation of the batteries. In this study, a new short-chain fluorinated diluent 1,1,2,2-tetrafluoroethyl methyl ether is used to prepare a methyl acetate-based LHCE that shows good stability against a LiNi 0.5 Mn 1.5 O 4 (LNMO) cathode. Furthermore, an LNMO||Li battery (3–4.9 V vs. Li/Li + ) with the LHCE shows good cycling stability at room temperature at 1C. Owing to the excellent low-temperature performance of the LHCE, the battery can discharge 80.85% of its room temperature capacity at 0.2C at the temperature of −50 °C and show reversible charge/discharge behavior at 0.1C at the temperature of −40 °C. In this study, LHCEs are successfully used to realize a high-voltage battery that could operate with a relatively high current density (≥0.1C) at a low temperature (-50 °C).
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hao Xu,Dong Zhu,Wen Zhu,Fengzhan Sun,Jianxin Zou,Richard M. Laine,Wenjiang Ding
Rechargeable magnesium sulfur batteries (MSBs) assembled with earth-abundant and safe Mg anodes less prone to form dendrites on surface and sulfur-containing cathodes offer considerable potential for high energy densities. Nevertheless, suitable sulfur host materials and electrolytes are at present key factors that retard commercial introduction. Here, we explore preparation of Ti 3 C 2 @CoO composites as sulfur hosts with high concentration electrolytes consisting of Mg(TFSI) 2 and AlCl 3 in diglyme as new types of MSBs. Density functional theory (DFT) simulations indicate that CoO adsorbs magnesium polysulfides more strongly than Ti 3 C 2 while Ti 3 C 2 is more conductive to Mg 2+ diffusion and transfer than CoO. Coincidentally, use of 1 M electrolyte restrains dissolution of magnesium polysulfides in electrolytes during battery cycling. The experiments indicate that combining Ti 3 C 2 @CoO sulfur hosts and 1 M Mg(TFSI) 2 /AlCl 3 /diglyme electrolyte provides viable MSBs, maintaining discharge capacities of 540 mAh g −1 after 70 cycles at 100 mA g −1 . Mechanistic studies indicate that these MSBs work via a S/MgS x ( x = 2–8) redox process although oxidation of polysulfide to sulfur is not efficient in initial cycling. The systems studied here may offer valuable insights and inspiration in the design of appropriate electrolytes and sulfur-host materials for MSBs.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）