Desalination and Water Treatment
·
2024
·
IF 1
Xu Zhang,Fan Yang,Jialing Qin,Huanghu Peng,Zezhou Chen,Lei Che,Shouxin Zhu,Wei Yang
The heterogeneous catalyst of CeO 2 /ZSM5 was applied to hydrolyze Congo red in subcritical water for the first time in the present study. The hydrolysis rate of Congo red could be significantly accelerated by introducing only 5 mg of 5% CeO 2 /ZSM5. The Congo red could be completely hydrolyzed at 220°C for 2 min—a reaction temperature 40°C lower than in the absence of 5% CeO 2 /ZSM5. In addition, the 5% CeO 2 /ZSM5 could be recycled for another run, and its Congo red hydrolysis efficiency and surface morphology showed no obvious change after 3 runs of recycling. The hydrolysis kinetics of Congo red in subcritical water could be well expressed by the Weibull model. The activation energy for hydrolysis of Congo red in subcritical water in the presence of 5% CeO 2 /ZSM5 (104.8 kJ mol –1 ) was much lower than in the absence of 5% CeO 2 /ZSM5 (155.9 kJ mol –1 ). The frequency factors were calculated to be 8.1 × 10 9 and 1.9 × 10 14 min –1 in the presence and absence of 5% CeO 2 /ZSM5, respectively. With these excellent properties, 5% CeO 2 /ZSM5 may prove to be an advantageous catalyst for the hydrolysis of Congo red in textile wastewater, in subcritical water.
研究领域:
环境化学
·
催化化学
·
水处理技术
·
绿色化学
·
反应动力学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2011
·
IF 2.794
Yuanchao Pei,Jing Liu,Zhenning Yan,Zhiyong Li,Jing Fan,Jianji Wang
In this paper, the interactions between cationic dyes and the ionic liquids (ILs) have been studied by 31 P nuclear magnetic resonance (NMR), UV–Vis spectroscopy and conductometric measurements at different temperatures. It was shown that a decrease in the measured specific conductance of the (dye + IL) mixtures was caused by the formation of non-conducting or less conducting (dye + IL) associates. The associates were formed by 1:1 ratio of cation of the cationic dyes and anion of the ILs by using the 31 P NMR and UV–Vis spectroscopy methods. The association constants were calculated by theoretical model based on the deviation from linear behavior, and the association constants were as high as 10 6 (L · mol −1 ) 2 . Thermodynamic results imply that the formation process of association was exothermic nature. It is expected that the associates reported here would have promising application as active materials for the preparation of ion-selective electrode used in the determination of ILs concentrations.
研究领域:
物理化学
·
分析化学
·
胶体与界面化学
·
药物化学
·
分子生物学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Feng Zhang,Xiantao Jiang,Zhiliang He,Weiyuan Liang,Shixiang Xu,Han Zhang
Antimonene (Sb), a novel 2D crystalline, has recently received intense attention from optoelectronic communities, due to its enticing physical and chemical properties. Here we systematically investigate the broadband third-order nonlinear optical properties and carrier dynamics in antimonene. Efficient saturable absorption effect was observed at different wavelengths, indicating the use for broadband ultrafast laser generation. The nonlinear refractive indexes were characterized to be (2.55 ± 0.23) × 10 −14 cm 2 /W and (7.88 ± 0.37) × 10 −15 cm 2 /W at 800 nm and 1500 nm, respectively. Photoinduced carrier dynamics are investigated by a non-degenerate transient absorption spectrometer. Fast recovery processes were observed in antimonene and suggesting a high optical modulation speed to 500 GHz.
研究领域:
光学材料
·
凝聚态物理
·
纳米光子学
·
非线性光学
·
超快光谱学
✓ 已验证
DOI
高影响因子
Asian Journal of Pharmaceutical Sciences
·
2016
·Vol. 12
·期 2
·202-208
·
IF 0
Huiyan Shi,Chenzhi Hou,Liqiang Gu,Zhe Wei,Hang Xing,Meiyu Zhang,Shixiao Wang,Longshan Zhao,Kaishun Bi,Xiaohui Chen
The present study was designed to investigate the influence of the pretreatment of piperazine ferulate on pharmacokinetic parameters of methotrexate in methotrexate-induced renal injury rats. A simple and efficient high performance liquid chromatography coupled with mass spectrometry (HPLC-MS) method was developed to determine methotrexate in rat plasma. Methotrexate and syringic acid (internal standard) were extracted from rat plasma samples by protein precipitation with acetonitrile. The analysis was performed on a CAPCELL PAK C 18 column (150 mm × 4.6 mm, 5 µm) with acetonitrile and 5 mmol/l ammonium acetate aqueous (10:90, v/v ). The linear range was 5.0 × 10 −2 to 100.0 µg/ml for methotrexate. Other parameters were all within the acceptance criteria. The validated method was successfully applied the pharmacokinetic study of methotrexate between two methotrexate treated groups (with and without the pretreatment of piperazine ferulate). Compared with the methotrexate treated alone group, the pharmacokinetic parameters in the methotrexate with the pretreatment of piperazine ferulate group showed significantly lower MRT (0-t) , MRT (0-∞) and T 1/2 . Results suggested that methotrexate can be rapidly eliminated, cleared or metabolized in rat blood, which might be related to the pretreatment of piperazine ferulate. The method provided deeper insights into rational clinical use of methotrexate with the pretreatment of piperazine ferulate on cancer patients with renal dysfunction.
研究领域:
药理学
·
药物代谢
·
肾脏病学
·
肿瘤学
·
临床药学
·
分析化学
✓ 已验证
DOI
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Xuzhao Yang,Jun Wang,Yun Fang
Experimental s olubility of D-(+)-glucose and D-(−)-fructose in three asymmetrical dicationic ionic liquids (DILs), 1-(3-(trimethylammonio)prop-1-yl)-3-methylimidazolium bis(dicyanamide) ([MIMC 3 N 111 ][N(CN) 2 ] 2 ), 1-(3-(trimethylammonio)prop-1-yl)-1-methylpiperidinium bis(dicyanamide) ([MPiC 3 N 111 ][N(CN) 2 ] 2 ) and 1-(3-(trimethylammonio)prop-1-yl)pyridinium bis(dicyanamide) ([PyC 3 N 111 ][N(CN) 2 ] 2 ), was determined through an isothermal technique from 323.15 K to 353.15 K at 0.1 MPa. The solubility of the two sugars in selected DILs increased with elevating temperature and the solubility decreased in the following order: D-(−)-fructose > D-(+)-glucose. The Apelblat, λh , NRTL, Wilson and UINQUAC models were respectively employed to correlate the experimental solubility values with temperature. The thermodynamics of dissolution of D-(+)-glucose and D-(−)-fructose in the studied DILs, enthalpy of dissolution (Δ diss 0 H ), Gibbs energy of dissolution (Δ diss 0 G ) and entropy of dissolution (Δ diss 0 S ), were also evaluated based on the experimental solubility data. The results indicated that enthalpic contributions were dominant in the dissolution process of D-(+)-glucose and D-(−)-fructose in those DILs.
研究领域:
物理化学
·
溶液化学
·
热力学
·
绿色溶剂
·
碳水化合物化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2018
·
IF 4.732
Chengwei Xu,Wenxia Xie,Xiaodong Si,Jun Zhang,Jiangang Yang
A TiO 2 /MWCNTs/Al 2 O 3 /NF (TiO 2 nanoparticles/multi-walled carbon nanotubes /Al 2 O 3 -modified nickel foams) composite filter was prepared through grown of MWCNTs upon Al 2 O 3 -modified nickel foams using chemical vapor deposition (CVD) method and then coated TiO 2 nanoparticles onto MWCNTs using dip-coating method. The MWCNTs forms a network-like structure on the surface layer of composite filter. The BET surface area of TiO 2 /MWCNTs/Al 2 O 3 /NF composite filter is more than 375 times higher than that of the pristine nickel foam. The degradation performance of oil particles was evaluated. Under optimized reaction conditions, 90% of the oleic acid on the filter was decomposed after 25 h. In addition, the effect of reaction temperature and light intensity were studied. Increased reaction temperature and light intensity were found to significantly improve the degradation rate and restrain the formation of refractory product. Furthermore, a parallel reaction kinetic model was adopted for degradation of oleic acid on the composite filter. The composite filter can reduces the accumulation of oil particles on the filter and the energy consumption of the filter. This approach proposes a new way to treat the cooking fume emission at residential building roofs.
研究领域:
环境科学
·
材料科学
·
化学工程
·
大气污染控制
·
纳米技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 15
·8026-8038
·
IF 2.936
Shuli Liu,Zhengyang Duan,Changhua He,Xiaojun Xu,Tianguo Li,Yuhuan Li,Xuan Li,Yao Wang,Longqian Xu
Phosphate-modified baker's yeast (PMBY) was prepared, and used as a novel bio-sorbent for the adsorption of Pb2+ from aqueous solution. The influencing factors, absorption isotherms, kinetics, and mechanism were investigated. The scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR) characterization and elemental analysis of PMBY showed that phosphate groups were successfully grafted onto the surface of yeast. The kinetic studies suggested that the adsorption process followed a pseudo-second-order chemisorption. The adsorption process of Pb2+ using PMBY was spontaneous and endothermic. Furthermore, the adsorption of Pb2+ on PMBY can rapidly achieve adsorption equilibrium (in just 3 min), and the maximum adsorption capacity of Pb2+ on PMBY was found to be 92 mg g−1 at 30 °C, which was about 3 times that of the pristine baker's yeast. The suggested mechanism for Pb2+ adsorption on PMBY was based upon ion-exchange, electrostatic interaction and chelation between the phosphate groups and Pb2+. However, compared with the pristine baker's yeast, the higher capacity and rapid adsorption of PMBY for Pb2+ was mainly due to the chelation and electrostatic interactions between the phosphate groups and Pb2+. In addition, the regeneration experiments indicated that the PMBY was easily recovered through desorption in 0.01 M HCl, and that PMBY still exhibited 90.77% of the original adsorption capacity for Pb2+ after five regeneration cycles. These results showed the excellent regeneration capability of PMBY for Pb2+ adsorption. PMBY has shown significant potential for the removal of heavy metals from aqueous solution due to its rapid adsorption, high-capacity and facile preparation.
研究领域:
环境科学
·
生物化学
·
环境污染治理
·
重金属吸附
·
材料科学
✓ 已验证
DOI
高影响因子
Applications in Energy and Combustion Science
·
2022
·
IF 0
Bingzhi Liu,Long Zhu,Qingbo Zhu,Hao Lou,Qiang Xu,Zhandong Wang
Ozone-assisted combustion is an advanced combustion technology that is considered a promising means for the active control of combustion. Ozone addition can enhance combustion processes and extend the experimental parameters to extreme conditions. In this work, ozone-assisted low temperature oxidation of methanol and ethanol in a jet-stirred reactor (JSR) was carried out at atmospheric pressure, with a fuel initial mole fraction of 0.005, an equivalence ratio of 0.28, and in the temperature range of 330–800 K. Significant conversions of methanol and ethanol were observed in the low temperature region when ozone was added. Numerous intermediate species were analyzed and quantified by synchrotron vacuum ultraviolet photoionization mass spectrometry and gas chromatography, which are crucially important for unraveling the low temperature oxidation reaction network. The kinetic model of NUIGMech1.1 is tentatively updated to better explain the measured results, although the improvements of the C 1 –C 2 core mechanisms are difficult. Ozone addition enhances the action of the reaction channel of related radicals. Model analysis shows that the kinetics of Ö/ȮH/HȮ 2 atoms/radicals are crucial for the overall reaction progress, as well as the reaction of HȮ 2 radicals with ozone, which mainly contributes to the formation of ȮH radicals during the initial reaction stage. Inconsistency between measurements and model predictions highlights the considerable uncertainty in the C 1 -C 2 alcohols subchemistry at lower temperatures. The experimental results obtained in this work and model development will motivate further study of the low temperature oxidation chemistry of methanol and ethanol.
研究领域:
化学工程
·
燃烧化学
·
反应动力学
·
能源化学
·
大气压反应器
✓ 已验证
DOI
FUEL
·
2022
·
IF 8.035
Yongtao Zhang,Fulin Chen,Yan He,Fei Wang
CO 2 sequestration based on hydrate technology is considered to be the most promising long-term CO 2 sequestration technology. In this study, a method of using initial stirring to activate CO 2 hydrate formation process was proposed in the aim of saving energy and avoiding the problem of stirring shaft stuck, where the stirring only played a role in activating hydrate formation process. Two amino acids, l -Methionine and d -leucine, were chosen as promoters for improving the formation kinetics of CO 2 hydrates, and l -Methionine presents better than d -leucine. When the concentration of l -methionine solution is equal to or greater than 4 mmol/L, even with the initial stirring of 10 rpm within 8 min, T 90 can be shortened to close to or less than 40 min with a high gas consumption of more than 7.3 mmol gas/mL water, where the promoting effect is similar to the condition of continuous stirring of about 100 min, indicating that about 90 % of the energy consumed for mechanical stirring can be saved. Moreover, an interesting phenomenon was observed that CO 2 hydrates firstly nucleated inside the l -methionine solution, and a large number of small hydrate floccules rapidly formed and filled the entire solution under the action of magnetic stirring, which proved the instantaneous excitation effect of stirring on hydrate formation. This work contributes to rethinking the promoting roles of stirring and promoters in CO 2 hydrate formation.
研究领域:
环境科学
·
能源化学
·
物理化学
·
气体水合物
·
碳捕集与封存
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 48
·2205163
·
IF 15.153
Shuhao Tian,Juanjuan Huang,Hongcen Yang,Guo Liu,Qi Zeng,Di Wang,Xiao Sun,Kun Tao,Guohan Liu,Shanglong Peng
The low utilization rate of active materials, shuttle effect of lithium polysulfides (LiPSs), and slow reaction kinetics lead to the extremely low efficiency and poor high current cycle stability of lithium sulfur batteries (Li–S batteries). In this paper, a self-supporting multicomponent hierarchical network aerogel is proposed as the modified cathode (S/GO@MX@VS 4 ). It consists of graphene (GO) and MXene nanosheets (MX) loaded with VS 4 nanoparticles. The experimental results and first-principles calculations show that the GO@MX@VS 4 aerogel has strong adsorption and reversible conversion effects on LiPSs. It can not only inhibit the shuttle effect and improve the utilization rate of active substances by keeping the chain crystal structure of VS 4 , but also promote the reversibility and kinetics of the reaction by accelerating the liquid–solid transformation in the reduction process and the decomposition of insoluble Li 2 S in the oxidation process. The GO@MX@VS 4 aerogel modified cathode with a multicomponent synergy exhibits the capacity ratios (Q 1 /Q 2 ) at different discharge stages is close to the theoretical value (1:2.8), and the capacity decay per cycle is 0.019% in 1200 cycles at 5C. Also, a high areal capacity of 6.90 mAh cm −2 is provided even at high sulfur loading (7.39 mg cm −2 ) and low electrolyte/sulfur ratio (E/S, 8.0 µL mg −1 ).
研究领域:
电化学储能
·
材料科学
·
纳米材料
·
能源化学
·
电池技术
·
表面催化
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Hui Shen,Mouming Zhao,Weizheng Sun
The influence of pH-induced structural modifications of myofibrillar proteins (MPs) on their interaction mechanisms with pyrazine compounds was investigated. At a lower pH (4.9, 5.5), MPs aggregated to larger particle sizes due to enhanced the protein–protein interactions. The binding with pyrazine compounds was strongly affected by pH and the nature of flavor compounds. MPs exhibited flavor releasing behavior, probably due to protein–protein interactions and surface tension. Fluorescence analysis revealed that the interaction of pyrazine compounds with MPs followed a combination of static and dynamic quenching. The changes in quenching constant ( K sv ) might be attributed to a dynamic quenching, probably due to protein aggregation. The percentages of free 2,5-Dimethylpyrazine (2,5-DMP) were similar to K sv . Thermodynamic parameters indicated that electrostatic interactions and hydrophobic interactions were the major acting forces in the binding of MPs to 2,5-DMP. The binding of 2,5-DMP increased the α-helix content of MPs.
研究领域:
食品科学
·
蛋白质化学
·
风味化学
·
分子互作
·
生物物理化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Hao Wu,Tianyi Jiang,Wenlong Wu,Shanguo Zhang,Ming Li,Jingzhuo Zhou,Mengya Zhu,Juzheng Chen,Ziyong Li,Yang Lu,Hongyuan Jiang
Water-in-oil-in-water (W/O/W) double emulsion droplets are a typical colloidal system applied in various practical fields. However, certain high-specification applications necessitate exact geometric homogeneity in terms of both shell diameter and thickness. Despite achieving uniformity in shell diameter, on-chip microfluidic emulsification always leads to an eccentric phenomenon due to innate density differences of the droplet solution. At the same time, the current regulation methods have multiple limitations, including their applicability, regulatory scope, and objective restrictions. Herein, we propose an off-chip osmosis-induced hydrodynamic method to accurately regulate the eccentricity of W/O/W double emulsion droplets. The rational selection of hypertonic osmosis can energize the droplets and induce inward transmembrane water flux. This flow helps to reposition the droplet core to align concentrically with the shell, regardless of the initial dimension and eccentricity of the droplets. As the osmotic induction reduces due to the dilution of the inner solute molar concentration , the optimal droplet configuration can be achieved when osmosis-induced hydrodynamic regulation sufficiently counteracts the adverse effects of droplet solution density difference. The microcapsules can thus be produced by instant UV polymerization of the regulated double emulsion droplets, and the silica microspheres with fine geometric homogeneity can be prepared through further heat treatment, which is expected to meet the stringent morphological requirements in practical applications.
研究领域:
胶体与界面化学
·
微流控技术
·
生物材料
·
药物递送系统
·
高分子科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）