Nanomaterials
·
2017
·Vol. 7
·期 5
·102
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IF 3.553
Jinfeng Sun,Zhiqiang Xu,Weifeng Li,Xiaodong Shen
The impact of nano-SiO2on the early hydration properties of alite-sulphoaluminate (AC$A) cement was investigated with a fixed water to solid ratio (w/s) of one. Nano-SiO2was used in partial substitution of AC$A cement at zero, one and three wt %. Calorimetry, X-ray diffraction (XRD), thermogravimetric/derivative thermogravimetric (TG/DTG), mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) analyses were used to characterize the hydration and hydrates of the blended cement. The hydration of the AC$A cement was significantly promoted, resulting in an increase of the heat released with the addition of nano-SiO2. Phase development composition analysis showed that nano-SiO2had no effect on the type of crystalline hydration products of the AC$A cement. Moreover, nano-SiO2showed significant positive effects on pore refinement where the total porosity decreased by 54.09% at three days with the inclusion of 3% nano-SiO2. Finally, from the SEM observations, nano-SiO2was conducive to producing a denser microstructure than that of the control sample.Keywords:nano-SiO2;AC$A cement;early hydration;properties
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2016
·
IF 1.835
Wei Su,Ai Zhang,Yan Sun,Meng Ran,Xiaojing Wang
Adsorption isotherms of pure C2H4 and C3H6 were measured on 11 adsorbents and at pressures up to 0.8 MPa using a volumetric method. The Brunauer–Emmett–Teller (BET) surface area of the adsorbents had a significant effect on adsorption capacities of both C2H4 and C3H6. The metal organic framework MIL-101 had the highest BET surface area and the highest adsorption capacity. For zeolite molecular sieves 5A, the C2H4 adsorption capacity was higher than that of C3H6, which is opposite to the results for most adsorbents. The isosteric heats of C3H6 on AC-1, 5A, MIL-101, ZIF-8, and SG-1 were higher than those of C2H4. The C3H6/C2H4 separation selectivities were calculated using the ideal solution theory, and the activated carbon AC-1 had the highest separation selectivity of 8.8.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2018
·Vol. 2
·期 6
·1206-1215
·
IF 0
Fanglin Li,Jianchun Jiang,Peng Liu,Qiaolong Zhai,Fei Wang,Chung-yun Hse,Junming Xu
Molecular structure transformation is a critical step for synthesis of aviation biofuels from triglycerides, to yield alkanes, aromatics and cycloalkanes. To this end, triglycerides were treated by catalytic cracking coupled with rectification to obtain hydrocarbon fuels, and the molecular weight of the liquid product was adjusted to the desirable boiling range of aviation fuel. To further modify the molecular structures, the pyrolytic hydrocarbons were partially converted into aromatics and cycloalkanes by a two-step process. Different raw materials including soybean oil, rubber seed oil, waste cooking oil and acidified oil were cracked with a 5 wt% base catalyst at 350–450 °C (under the atmospheric pressure) in a benchtop reactor. Afterwards, the linear hydrocarbons of C8–C15 size were transformed into aromatics by HZSM-5 at 350 °C for 6 h. Then, a portion of the aromatics were converted into cycloalkanes catalyzed by Pd/AC at 200 °C and 6 MPa (H2) for 6 h. As a result, a desirable mixture of linear hydrocarbons, aromatics and cycloalkanes was obtained with a similar composition and properties to traditional fossil aviation fuels.
研究领域:
生物化学
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能源科学
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催化化学
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产品关联
DOI
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
·
IF 0
Zheng Yang,Zhang Lin,Wang Xiaocong,Guo Fenghui,Xing Yi,Li Guoliang,Yue Tao
The substantial amount of mercury emissions from coal-fired flue gas causes severe environmental contamination. With the Minamata Convention now officially in force, it is critical to strengthen mercury pollution control. Existing activated carbon injection technologies suffer from poor desulfurization performance and risk secondary-release risks. Therefore, considering the potential industrial application of adsorbents, we selected cost-effective and readily available activated coke (AC) as the carrier in this study. Four metal selenides—copper, iron, manganese, and tin—were loaded onto the AC to overcome the application problems of existing technologies. After 120 min of adsorption, the CuSe/AC exhibited the highest efficiency in removing Hg 0 , surpassing 80% according to the experimental findings. In addition, the optimal adsorption temperature window was 30–120 °C, the maximum adsorption rate was 2.9 × 10 −2 mg·g −1 ·h −1 , and the effectiveness of CuSe/AC in capturing Hg 0 only dropped by 5.2% in the sulfur-containing atmosphere. The physicochemical characterization results indicated that the AC surface had a uniform loading of CuSe with a nanosheet structure resembling polygon and that the Cu-to-Se atomic ratio was close to 1:1. Finally, two possible Hg 0 reaction pathways on CuSe/AC were proposed. Moreover, it was elucidated that the highly selective binding of Hg 0 with ligand-unsaturated Se − was the key factor in achieving high adsorption efficiency and sulfur resistance in the selenium-functionalized AC adsorbent. This finding offers substantial theoretical support for the industrial application of this adsorbent. Graphical Abstract
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
PubMed
CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Hongyan huang,Shengji Wu,Hui Wang,Jie Zhou
Thermal pretreatment reduces rather than improves Hg 0 removal of AC. • Acidic functional groups serve as the active centers for Hg 0 oxidation. • Hydrogen-bonded microenvironment enhances catalytic activity of acidic sites. • Synergy of acid sites and microenvironment enables high-efficiency Hg 0 removal. Activated carbon injection is a mainstream technology for elemental mercury (Hg 0 ) removal from flue gas. This study investigates an abnormal phenomenon that thermal pretreatment of AC reduces rather than improves its Hg 0 removal efficiency, and systematically elucidates the underlying mechanism. The results demonstrate that acidic sites (e.g., carboxyl groups) on the AC surface serve as the active centers for the catalytic oxidation of Hg 0 , while the hydrogen-bonded microenvironment formed by adsorbed H 2 O molecules significantly enhances the acidity strength and catalytic activity of the acidic sites. Removal of the hydrogen-bond microenvironment severely reduces Hg 0 removal performance, whereas supplementation of H 2 O or other hydrogen-bond donor molecules effectively recovers the Hg 0 removal efficiency. At medium-to-high temperatures, constructing a thermally stable microenvironment (e.g., using benzoic acid) significantly improves the Hg 0 removal efficiency of AC. Based on this synergistic mechanism, the acid-treated and benzoic acid-modified AC (AC-H-150-benzoic acid) could achieve an initial Hg 0 removal efficiency of 75.8% at 150 °C. This work reveals the synergistic effect between acidic sites and the hydrogen-bonded microenvironment on AC for Hg 0 removal, providing new insights for the rational design of high-performance Hg 0 removal adsorbents. Download: Download high-res image (182KB) Download: Download full-size image
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高影响因子
Insects
·
2022
·Vol. 13
·期 11
·1056
·
IF 3.139
Nanxia Fu,Fida Hussain Magsi,Yingjie Zhao,Xiaoming Cai,Zhaoqun Li,Lei Bian,Chunli Xiu,Zongmao Chen,Zongxiu Luo
Simple SummaryThe tea tortrixArchips strojnyis a major pest of spring tea in China. Using sex pheromone-based mass trapping or mating disruption techniques to control this pest can minimize excessive pesticide usage, thereby maintaining pesticide residues within the safety standard for spring tea products. However, the sex pheromone components of this species remain elusive. In this study, we identified these components: laboratory assays showed that two bioactive compounds in female sex pheromone gland extracts, namely, (Z)-11-tetradecenyl acetate (Z11-14:Ac) and (Z)-11-tetradecenyl alcohol (Z11-14:OH), could elicit male moth antennal responses. A field trapping assay demonstrated that Z11-14:Ac was the attractant in the sex pheromone, while Z11-14:OH seemed to be an antagonist. Overall, our results indicated that lures baited with 1 mg of Z11-14:Ac could be used as a monitoring or mass trapping tool forA. strojnymanagement in Chinese tea plantations. Furthermore, Z11-14:Ac was found to be a common attractant in the sex pheromones of nine leafroller species in the genusArchips. Thus, Z11-14:Ac may be used to develop a mating disruption technique targeting multiple leafroller species.AbstractPesticide application is the only known control method for the tea tortrixArchips strojny(Lepidoptera: Tortricidae), which is a major pest of spring tea in China. To develop sex pheromone-based, environmentally safe control strategies, here we identified the sex pheromone components of this species. The male moths’ antennae responded electrophysiologically to two compounds in female pheromone gland extracts. Gas chromatography–mass spectrometry analysis indicated that the two bioactive compounds were (Z)-11-tetradecenyl acetate (Z11-14:Ac) and (Z)-11-tetradecenyl alcohol (Z11-14:OH). Field trapping assays showed that lures baited with only the major component Z11-14:Ac were the most attractive to male moths, and the attractiveness decreased significantly when the lure was impregnated with increased relative ratios of the minor component Z11-14:OH. Our study demonstrated that Z11-14:Ac was the major attractant in theA. strojnysex pheromone, and the minor component Z11-14:OH seemed to serve as an antagonist. The results indicate that lures baited with 1 mg of Z11-14:Ac could be used as a monitoring or mass trapping tool forA. strojnymanagement in Chinese tea plantations. Furthermore, Z11-14:Ac was identified as a common sex pheromone attractant of nineArchipsspecies; these results lay the foundation for developing mating disruption techniques that target multiple leafroller pests.Keywords:female sex pheromone;Archips strojny;(Z)-11-tetradecenyl acetate;male attraction;tea pest
研究领域:
昆虫学
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农业科学
·
化学生态学
✓ 已验证
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
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2016
·
IF 2.463
Rong-Zhu Wang,Dong-Qiang Lin,Wen-Ning Chu,Qi-Lei Zhang,Shan-Jing Yao
Peptide ligands have been developed as powerful alternatives to Protein A for antibody purification. In this study, a tetrapeptide library with two aromatic residues, one arginine and one aromatic/aliphatic residue (Aro-Aro-R-Aro/Ali) was constructed considering molecular interactions and applications. The library had 128 peptide ligands and was screened by flexible docking and molecular dynamics simulation. The results indicated that Ac-YFRH was the best ligand, and then was coupled onto an aminated argarose matrix. The results of isotherm adsorption showed that the binding capacity of human immunoglobulin G (IgG) was high at pH 7⿿8 and low at pH 4⿿5. The IgG adsorption also showed obvious salt-independence, and the addition of salt could reduce unspecific adsorption caused by electrostatic interaction. After the optimization of pH and salt addition, high IgG purity of 98.4% could be obtained with the recovery of 89.4% from BSA-containing feedstock. The purification of monoclonal antibody from CHO cell culture supernatant was tested, and the purity and recovery reached 98.0% and 79.5%, respectively. The results demonstrated that the new resin with the tetrapeptide YFRH ligand had high affinity and flexible operation window for IgG purification.
研究领域:
生物化学
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分子生物学
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产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Weidong Fang,Zhi Tao,Haiwang Li,Yuqian Ma,Shuai Yin,Tiantong Xu,Teckneng Wong,Yi Huang
Emulsions have been applied in a number of industries such as pharmaceutics, cosmetics, and food, which are also of great scientific interest. Although aqueous emulsions are commonly used in our daily life, oil-in-oil (o/o) emulsions also play an irreplaceable role in view of their unique physics and complementary applications. In this paper, we investigate typical behaviors of organic droplets surrounded by organic medium (o/o emulsions) with different functional groups controlled by the AC electric field. Droplet behaviors can be catalogued into five types: namely, “no effect”, “movement”, “deformation”, “interface rupture”, and “disorder”. We identify the key dimensionless number Wee·Ca, combined with the channel geometry, for characterizing the typical behaviors in silicon oil/1,6-hexanediol diacrylate and mineral oil/1,6-hexanediol diacrylate emulsions. Unlike aqueous emulsion, the Maxwell–Wagner relaxation inhibits the electric effect and leads to an effective frequency, ranging from 0.5 to 3 kHz. The increasing viscosity of the droplet facilitates the escalation by promoting the shearing effect under the same flow conditions. Ethylene glycol droplets primarily show the efficient coalescence even at a low Wee·Ca, which is attributed to the attraction of free charges induced by the increasing conductivity. In 1,6-hexanediol diacrylate/silicon oil emulsion, the droplet tends to form a liquid film that expands into the entire channel due to the affinity of the droplet to the channel wall. A variety of elongated columns are observed to oscillate between the electrodes at high voltages. These findings can contribute to understanding the electrohydrodynamic physics in o/o emulsion and controlling droplet behaviors in a fast response, programmable, and high-throughput way. We expect that this droplet manipulation technology can be widely adopted in a broad range of chemical synthesis and biological and material science.
研究领域:
物理学
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化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
LAB ON A CHIP
·
2023
·Vol. 23
·期 9
·2341-2355
·
IF 6.1
Weidong Fang,Zhi Tao,Haiwang Li,Shuai Yin,Tiantong Xu,Yi Huang,Teckneng Wong
Droplet coalescence with fast response, high controllability and monodispersity has been widely investigated in industrial production and bioengineering. Especially for droplets with multiple components, programmable manipulation of such droplets is crucial for practical applications. However, precise control of the dynamics can be challenging, owing to the complex boundaries and the interfacial and fluidic properties. AC electric fields, with their fast response and high flexibility, have attracted our interest. We design and fabricate an improved flow-focusing microchannel configuration together with a non-contact type of electrode featuring asymmetric geometries, based on which we conduct systematic investigations of the AC-electric-field-controlled coalescence of multi-component droplets at the microscale. Parameters such as flow rates, component ratio, surface tension, electric permittivity and conductivity were given our attention. The results show that droplet coalescence in different flow parameters can be achieved in milliseconds by adjusting the electrical conditions, which shows high controllability. Specifically, both the coalescence region and reaction time can be adjusted by a combination of applied voltage and frequency, and unique merging phenomena have appeared. One is contact coalescence with the approach of paired droplets, while the other is squeezing coalescence, which occurs in the start position and promotes the merging process. The fluid properties, such as the electric permittivity, conductivity and surface tension, present a significant influence on merging behavior. The increasing relative dielectric constant leads to a dramatic reduction of the start merging voltage from the original 250 V to 30 V. The range of effective voltage for coalescence decreases with the addition of surfactant, offering a stricter and yet higher selectivity on electrical conditions, about 1500 V. The conductivity presents a negative correlation with the start merging voltage due to the reduction of the dielectric stress, from 400 V to 1500 V. Finally, we achieve the precise fabrication process of the Janus droplet via implementation of the proposed method, where the components of the droplets and the coalescence conditions are well controlled. Our results can serve as a potent methodology to decipher the physics of multi-component droplet electro-coalescence and contribute to applications in chemical synthesis, bioassay and material synthesis.
研究领域:
生物工程
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Shanshan Shao,Zian Ye,Xinggang Hu,Jiayuan Sun,Xiaohua Li,Huiyan Zhang
It is a simple, green, and energy-saving way to produce targeted alkanes in the range of jet fuel from biomass-derived carbonyls by aldol condensation and hydrogenation in one pot over the bifunctional catalyst. The catalyst and solvent system played a significant role in this. It was discovered that Ni was preferentially loaded on the region centered on the weak basic sites. The amount of weak and medium basic sites gradually decreased as Ni occupied the region, and the aldol condensation performance was inhibited. The aldol condensation was favored in the aqueous solvent compared with that in the organic solvent. Some condensates presented insoluble in the aqueous solvent, and the hydrogenation performance was weakened, resulting in a poor yield of 48.2% for the targeted alkanes. In order to strike a balance between aldol condensation and hydrogenation in the organic and aqueous solvent, the biphasic solvent system was proposed. The results showed that the total yield of targeted alkanes reached 77.0% with an aqueous and organic solvent ratio of 1:2. The catalytic performance of Ni/Mg-Al-O/AC dropped substantially after 5th reuses, caused by Ni sites coverage due to the formation of boehmite via the hydration of Ni/Mg-Al-O/AC with water. Zr ions replaced Al ions in the bifunctional catalyst, then the yield of the final product achieved 75.6% with Ni/Mg-Zr-O/AC, and it was still maintained at 67.9% after 5th reuses. In this study, the one-pot combination of C-C coupling and hydrogenation was achieved by designing the catalyst and solvent system, promoting biomass-derived jet fuel development more sustainably and simply.
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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绿色化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Yuming Tu,Gaoyan Shao,Wenjing Zhang,Jianjie Chen,Yixin Qu,Fan Zhang,Shichao Tian,Zhiyong Zhou,Zhongqi Ren
Printing and dyeing wastewater generally has high pH, high turbidity , poor biodegradability , complex composition, and high chroma, which make it one of the most difficult industrial wastewaters to treat. Herein, heterogeneous ozone oxidation technology is applied to oxidize and degrade printing and dyeing wastewater. A metal oxide catalyst supported on activated carbon (γ-MnO 2 /AC) was prepared by hydrothermal synthetic method and shown to enable synergistic catalysis involving MnO 2 metal sites and N/C sites. A simulated methyl orange solution was used to determine the effects of various preparation and operation parameters. The results confirmed that the γ-MnO 2 /AC catalyst exhibited good chemical oxygen demand (COD) removal and reusability. Additionally, γ-MnO 2 /AC demonstrated excellent degradation of the secondary biochemical effluent of printing and dyeing wastewater (COD removal = 72.45% within 120 min). The γ-MnO 2 /AC catalyst was fully characterized, and the mechanism governing its catalytic ozone oxidation process was investigated experimentally.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 29
·期 1
·146
·
IF 4.6
Zitao Yang,Cunhao Luo,Ning Wang,Junshao Liu,Menglong Zhang,Jing Xu,Yongnan Zhao
The high power density and long cyclic stability of N-doped carbon make it an attractive material for supercapacitor electrodes. Nevertheless, its low energy density limits its practical application. To solve the above issues, Fe2O3embedded in N-doped porous carbon (Fe2O3/N-PC) was designed by pyrolyzing Hemin/activated carbon (Hemin/AC) composites. A porous structure allows rapid diffusion of electrons and ions during charge–discharge due to its large surface area and conductive channels. The redox reactions of Fe2O3particles and N heteroatoms contribute to pseudocapacitance, which greatly enhances the supercapacitive performance. Fe2O3/N-PC showed a superior capacitance of 290.3 F g−1at 1 A g−1with 93.1% capacity retention after 10,000 charge–discharge cycles. Eventually, a high energy density of 37.6 Wh kg−1at a power density of 1.6 kW kg−1could be delivered with a solid symmetric device.Keywords:Hemin/AC;Fe2O3/N-PC;pseudocapacitance;quasi-solid-state supercapacitor
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）