Journal of Cleaner Production
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2023
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IF 11.1
Hai-Xia Yu,Xinxin Yu,Siwei Chen,Jingcheng Hao,Lu Xu
Emulsions consisting of lubricating base oil and water have extensive applications in the fields of metalworking and heavy-duty machinery. Due to the compositional complexity that confines an effective recycling of emulsion constituents and the frequent use of toxic, non-biodegradable mineral base oil, an industrial emulsion lubricant is usually easy to produce severe environmental burdens and health issues. Here we report a dual-responsive and versatile lubricating emulsion solely consisting of water, an eco-friendly ester base oil and a synthetic cationic emulsifier . Taking advantage of the inclusion of azobenzene moiety, [CeCl 3 Br] - anion and methylimidazole head-group, the surfactant can not only undergo tribochemical reactions to function as a lubricant additive to achieve very low interfacial friction, but also endow the resulting emulsion efficient anticorrosion, antibiosis and both light- and magneto-responsiveness. Based on a reversibly photo-triggered variation in the hydrophobicity of surfactant, an on-demand separation and recycling of emulsion component followed by a nearly one order of magnitude conversion in the friction can be realized. Together with its magneto-controlled migration and adaptivity to high normal loads, we envision that the emulsion lubricant may find potential applications in a broad range of industrial systems requiring lubrication and heat dissipation as well as smart devices needing control over the friction between two contacting surfaces.
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高影响因子
Small Methods
·
2023
·Vol. 7
·期 6
·2300302
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IF 12.4
Ling Lei,Jiaxi Yin,Kangbing Wu,Nianjun Yang
2D MXenes are widely proved to be potential electrode materials, although the size effect on their electrochemistry is not fully understood. In this work, Ti 3 C 2 T x nanoflakes are prepared through acidic etching of Ti 3 AlC 2 powders, followed by the intercalation treatment with tetrapropylammonium hydroxide. Such a method produces large-scale delaminated and oxygenated nanoflakes. With aid of centrifugation, the nanoflakes with varied lateral sizes and thicknesses are collected, where electrochemical response of charged redox probes and polar phenol molecules is varied. Density functional theory and energy dispersive spectroscopy confirm such electrochemical response is dependent on the size and thickness of used nanoflakes, more exactly the oxygen content on their surface. Taking the nanoflakes obtained using a centrifugal speed of 5000 rpm (MX-TPA 0.2 ) as an example, they feature good dispersibility, a high oxygen content, a small size, and a thin thickness. On these nanoflakes electrochemical response of polar p -substituted phenols is pronounced, stemming from a strong electron-withdrawing interaction of their oxygenated termination with the Ar-OH. A sensitive electrochemical sensor is further constructed for the detection of p -nitrophenol. This work thus provides an approach to synthesize MXenes with different sizes and thicknesses as well as further to reveal size-dependent electrochemistry of MXenes.
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高影响因子
CHEMOSPHERE
·
2023
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IF 8.8
Bo Cao,Jianhua Qu,Yingyu Chu,Yujiao Zhu,Yuxin Jiang,Xiubo Zhang,Mingze Sun,Zhao Jiang,Shouyi Ma,Ying Zhang
Persulfate (PS) activation by nanoscale zerovalent iron (nZVI) is promising for water purification , while is limited due to its easy agglomeration and oxidation. Herein, nZVI encapsuled in carbon matrix shell was synthesized via one-step carbothermal reduction. The core-shell structure effectively inhibited oxidation and agglomeration of nZVI core, and graphitized porous structures facilitated phenol binding with maximal adsorption capacity of 117.10 mg/g achieved by nZVI 0.6 -BC 800 . Both reactive oxygen species ( S O 4 • − , O • H , O 2 • − and 1 O 2 ) and electron transfer process resulted in phenol decomposition. Owing to diversified active sites, the nZVI 0.6 -BC 800 /PS system could completely degrade phenol degradation within short time, and exhibited great adaptation to extensive pH range (3.0–9.0) and coexisting substances. Additionally, the nZVI 0.6 -BC 800 /PS system could maintain over 85% removal of phenol after three recycles or 50 days of storage, and was highly-efficient to different water environments, thus proposing rational design of iron-carbon catalyst with potential in water treatment.
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高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Na Ji,Alazar Alemayehu,Hanyang Li,Poknam Ri,Xinyong Diao
The production of phenol from lignin or its model compounds, instead of cumene oxidation is very interesting from the viewpoint of sustainability and economics. The selective demethylation of anisole was an efficient but challenging route to produce phenol. In this work, we demonstrated the fabrication of nickel sulfide (Ni 9 S 8 +Ni x S 6 ) nanoparticles on Al 2 O 3 matrix by a facile in situ sulfidation of NiAl hydrotalcite and announced that nickel sulfide can serve as efficient active site for the demethylation of anisole for the first time. The as-designed 4Ni1Al-S catalyst exhibited a hierarchical morphology with a high particle density and high dispersion, affording a 95.6% yield of phenol in the demethylation of anisole under relative milder reaction temperature (270 °C) when compared to the reported state-of-the-art results. By comprehensive characterizations and experiments, we inferred that the nickel sulfide exsolved from the LDH structure exhibited stronger metal-support interaction than that obtained from the impregnation method, which not only benefits the uniform dispersion of active nickel sulfide but also results in the electronic transfer from Ni center to Al 2 O 3 support. As a consequence, enhanced demethylation activity was achieved on 4Ni1Al-S in comparison to Ni-S/Al 2 O 3 -IM.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Qihui Wang,Zeyu Guan,Yi Xiong,Dongya Li
Lower reaction speed and excessive oxidant inputs impede the removal of contaminants from water via the advanced oxidation processes based on peroxymonosulfate. Herein, we report a new confined catalysis paradigm via the hollow hetero-shell structured CN@C (H-CN@C), which permits effective decontamination through polymerization with faster reaction rates and lower oxidant dosage. The confined space structures regulated the C N and C O and electron density of the inner shell, which increased the electron transfer rate and mass transfer rate. As a result, C N in H-CN@C-10 reacted with peroxymonosulfate in preference to C O to generate singlet oxygen, improving the second-order reaction kinetics by 503 times. The identification of oxidation products implied that bisphenol AF could effectively remove by polymerization, which could reduce carbon dioxide emissions. These favorable properties make the nanoconfined catalytic polymerization of contaminants a remarkably promising nanocatalytic water purification technology.
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高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2022
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IF 1.193
Guang-Lin ZHU,Bing WANG,Guo FENG,An-Xian HUANG,Guo YIN,Shu-Hong WANG,Hong-Mei SU,Wen-Jing WANG,Ping WANG,Xie-An YU
Asparagi radix (AR) is a widely used in traditional Chinese medicines (TCMs). It is well-known for the antiaging effect, but the responsible for effective components from AR remained unknown. Herein, this study aimed to establish a seemly screening method for antioxidant activity components from AR. After optimizing the process parameter of AR, the best processing method was determined and 25 decoction pieces of AR (DPAR) with different processing technology and antioxidant activities was taken for subsequent experiments. Further, facing to the diversified compounds from AR, photodiode array (PDA) detector and charged aerosol detector (CAD) equipped in HPLC were integrated to screen the specific antioxidant compounds through spectrum-effect relationship, and the mostly correlation components with antioxidant activity were partially identified by the UPLC-Q/TOF-MS analysis. The results showed that the antioxidant effect from AR was due to the synergistic effect of multiple compounds mainly including five furostanol glycosides, citric acid and 5-hydroxymethyl-2-furaldehyde. Collectively, establishing diversified analysis model of spectrum-effect relationship provided a broadly applicable strategy for accurately screening the bioactive substances and quality evaluation of AR.
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Frontiers in Nutrition
·
2022
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IF 6.59
Lei Huan-Qing,Li Dong-Mei,Woo Meng-Wai,Zeng Xin-An,Han Zhong,Wang Ruo-Yong
Kaempferia elegans polysaccharide (KEP) was extracted using a high-voltage pulsed electric field-assisted hot water method. Its physicochemical properties, in vitro activity and hypoglycemic effect was investigated. Experiments were undertaken with diabetic mice models and the potential mechanism of KEP to improve blood glucose levels was unveiled through measurements of relevant indicators in the serum and liver of the mice. Results showed that KEP is mainly composed of glucose, rhamnose, arabinose, and galactose. It has certain DPPH and ABTS free radical scavenging ability and good α-glucosidase inhibitory ability, indicating that KEP has the potential to improve blood glucose levels in diabetes patients. The experimental results of KEP treatment on mice showed that KEP could control the continuous increase of fasting blood glucose levels. The potential mechanisms behind this blood glucose level control composes of (1) increasing the glucokinase and C peptide levels and decreasing Glucose-6-phosphatase content for improving key enzyme activity in the glucose metabolism pathway. This promotes the consumption of blood glucose during glycolysis, thereby inhibiting the production of endogenous glucose in gluconeogenesis pathway; (2) reducing triglyceride, total cholesterol, low density lipoprotein cholesterol, and increasing high density lipoprotein cholesterol content, for regulating blood lipid indicators to normal levels; and (3) by improving the activities of catalase, glutathione peroxidase, and antioxidant enzymes superoxide dismutase for further improving the antioxidant defense system in the body to reduce blood glucose.
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Food Bioscience
·
2022
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IF 5.318
Shengyang Shi,Yanjun Wei,Xinping Lin,Huipeng Liang,Sufang Zhang,Yingxi Chen,Liang Dong,Chaofan Ji
Kombucha is a kind of traditional fermented sugared tea rich in polyphenols. Although the health effects of tea polyphenols (TPPs) have been extensively studied, the biotransformation of the TPPs during kombucha fermentation was not fully elucidated. In this study, the polyphenol transformation capacity of microbial strains and the synthetic microbial communities during the tea broth fermentation were investigated. Firstly, six microbial species demonstrated different polyphenol transformation abilities: Acetobacter pasteurianus , Zygosaccharomyces bailii and Debaryomyce hansenii could increase the contents of epigallocatechin gallate (EGCG), the most abundant components of TPPs. Z. bailii and Acetobacter xylinum could enhance the concentration of TPPs with low molecular weight. Then, four synthetic microbial communities (SMC) consisting of different species were constructed to ferment the black tea broth. When different strains coexisted, their interaction could further enhance kombucha's phenols transformation and antioxidant activity . Specifically, the SMC, constructed by Z. bailii , L. plantarum and D. hansenii , could enhance the EGCG content significantly in tea broth and the total phenols and flavonoid contents. Meanwhile, the antioxidant activities of kombucha fermented by this SMC were found to be relatively high among different fermented tea broth groups. Besides, it is demonstrated that A. pasteurianus was a strong competitor in the tea broth environment. This bacterium could decrease the number of viable yeast cells by producing more acid. This study demonstrated that the construction of suitable synthetic microbial communities would help reveal the phenolic metabolic characteristics of complex microbial communities and obtain customizable phenolic combinations for kombucha products.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 7
·e53497
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IF 3.057
Jilei Xu,Ping Chen,Shuaijiang Ma,Guohao Zhu
In this work, three bismaleimides containing cardo and ortho -oxazine structures, with dual advantages of bismaleimide and benzoxazine resins, were synthesized. Their chemical structures were characterized by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy. The polymerization behaviors of bismaleimides were investigated using non-isothermal differential scanning calorimetry and in situ Fourier transform infrared spectroscopy. Results showed that the inclusion of both, bismaleimide and benzoxazine, provided a new structure with better thermal stability and solubility, as compared to the same type and commercial bismaleimides. The ortho-oxazine functionalized bismaleimide resin exhibited excellent thermal stability up to 440°C, whereas the carbon residue rate reached 73% at 800°C. Additionally, further thermal rearrangement of the internal structure of the polymer at high temperature provided a benzoxazole structure that had better thermal stability. The rearrangement due to the thermal changes was confirmed by in situ FTIR and solid-state 13 C-NMR spectroscopy. Based on the micro calorimetry characterization, it is found that both the bismaleimide and the benzoxazole resins formed after thermal rearrangement have excellent flame-retardant properties.
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FOOD CHEMISTRY
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2022
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IF 9.231
Jiaqing Huang,Cailin Qiao,Xinrou Wang,Yuwei Gao,Jinsong Zhao,Huibo Luo,Yongzhong Wang,Changjun Hou,Danqun Huo
Pichia kudriavzevii was one of the important aroma-producing fungi in the solid-state fermentation of Baijiu, and immobilization was an effective strategy for improving microbial performance. Herein, P. kudriavzevii cells were immobilized in a gel network that crosslinked by chitosan and sodium alginate to form sodium alginate/chitosan- P. kudriavzevii microspheres (SA/CS-PMs). Their structural characteristics and formation processes were characterized by SEM and FT-IR. The effect of synthesis conditions on the performance of microspheres were determined by single-factor experiments. Under the optimal conditions, the SA/CS-PMs could increase the amylase activity of the fermentation broth by 57.18%, the esterase activity by 66.13%, the content of ester by 67.04%, and could be reused at least three times. Further research results indicated that the content of ester could be increased significantly in Baijiu solid-state fermentation with the SA/CS-PMs. In conclusion, the SA/CS-PMs could improve the ester production ability of P. kudriavzevii by increasing the esterase activity, which was a valuable exploration of directional biosynthesis and a feasible strategy to improve solid-state fermentation quality.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Jinxi Feng,Tiantian Zhang,Wen Yan,Jingxiang Sun,Shuanghong Tian,Zhili He,Ya Xiong
A new piezo-catalytic reactor (PCR) was constructed. It was used to investigate the piezocatalytic degradation of pollutants and simultaneous response of current. It was found that PCR with SnO 2 / t -BaTiO 3 /ITO film anode possessed a more favourable piezocatalytic degradation and piezo-current response than PCR with only ITO or t -BaTiO 3 /ITO film anode, individually. For HCOOH, the degradation rate, short circuit current (I sc ) and open-circuit voltage (V oc ) reached 77.8 mg·L -1 ·h −1 , 5.12 µA, and 0.65 V, respectively, under its optimal condition. Its anodic process predominantly involved the piezocatalytic oxidations of H 2 O to •OH and HCOOH to CO 2 , while the cathodic process was mainly related to the reduction of O 2 to •O 2 – or H 2 O 2 and reduction of H + ion to H 2 . Although these processes were depended on the energy band structure of t -BaTiO 3 and redox potential of cathodic reactions, they were all initiated by the piezoelectric effect of t -BaTiO 3 , which drove the separation of intrinsic free carries to generate oxidative holes and reductive electrons. These investigation results and findings not only deepened the understanding of its piezo-current response, but also possibly extended the application of piezocatalysis to fuel cell.
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高影响因子
FUEL
·
2022
·
IF 8.035
Ji Zhao,Jing-Hui Lv,Xian-Yong Wei,Qian-Qian Kong,Jia-Hao Li,Yang-Yang Zhang,Zhuang Li,Li Li,Zi-Chun Fan,Zhi-Min Zong
Ni/CeO 2 -La 2 O 3 with strong acidity was prepared by in - situ carbon templating (ISCT) and subsequent reduction with H 2 . The phase composition, specific surface area, morphology, acidity, and elemental valence composition of the catalyst were characterized. The catalytic methylation (CM I ) of phenol over the catalyst in different ratios of methanol to n -hexane was investigated under N 2 atmosphere. Over the catalyst, phenol was completely converted into 2,6-xylenol at 260 °C for 3 h via the CM I of phenol to o -cresol and subsequent CM I of o -cresol.
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