CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Feilong Liu,Junqi Chen,Huaicheng Xiang,Jie Li,Yang Yang,Ying Tang,Liang Fang
In this work, two novel hexagonal magnetoplumbite-type LaMGa 11 O 19 (M = Mg, Zn) ceramics were prepared and deeply investigated. XRD patterns, SAED and HRTEM images analysis results demonstrated that the LaMGa 11 O 19 (M = Mg, Zn) ceramics are formation of hexagonal magnetoplumbite structure with a space group of P 6 3 / mmc . Both ceramics exhibited relatively high density (>95 %) and large positive τ f (+145.1 and + 136.7 ppm/°C), combined with moderate ε r around 20 and reasonable Q × f values of 19,328 GHz and 22,197 GHz, which be used as a temperature compensator for LTCC applications. The intense rattling effect of La 3+ cations resulted in abnormally high dielectric constant with a large positive variation by a factor of over 0.70 from the theoretical values calculated using the Clausius-Mossotti formula according to each ion's polarizability, negative τ αm , and positive τ f values. The P–V–L chemical bond theory analysis and impedance spectroscopy showed that the large dielectric loss might result from the high ionicity of the La-O bond and conduction loss, thus leading to relatively low Q × f for the LaMGa 11 O 19 (M = Mg, Zn) ceramics.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hong-Mei Fu,Xi-Peng Zhang,Shi-Chao Qi,Ding-Hua Liu
The p -chlorotoluene (PCT) and m -chlorotoluene (MCT) are indispensable chemical intermediates in pharmaceuticals, agrochemicals, and material synthesis. However, the similar physical and chemical properties of the PCT and MCT make their efficient separation a severe challenge in the current chemical separation field. In this study, a metal-organic framework named Mn-dhbq (dhbq = 2,5-dihydroxy-1,4-benzoquinone) is employed to achieve highly efficient separation of PCT/MCT in a solvent system with 1,3,5-trimethylbenzene. The Mn-dhbq exhibits the adsorption capacity of 208 mg/g for PCT and 72 mg/g for MCT at 25 °C, with initial concentration of 20 % for both PCT and MCT. Notably, the dual-site Langmuir-Freundlich selectivity is 38 with the concentration of 1 % for PCT and MCT. Density functional theory (DFT) calculations reveal differences in the amount of charge transfer and interaction sites between the framework and adsorbate, and these factors collectively contribute to the selective separation of PCT and MCT by Mn-dhbq.
研究领域:
化学工程
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分离科学
·
材料化学
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金属有机框架
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吸附技术
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Qing Song,Qiu-Yue Kang,Sa-Ying Li,Qiu-Yan Yu,Zhi-Hong Liu
Three isotypic polyborate cluster compounds for Na 5 [AlB 24 O 34 (OH) 12 ]·5.5H 2 O, Na 5 [CrB 24 O 34 (OH) 12 ]·5H 2 O and Na 5 [GaB 24 O 34 (OH) 12 ]·3H 2 O have been synthesized and characterized by EDS, XRD, FT-IR, TG techniques and chemical analysis. The molar enthalpies of solution of Na 5 [AlB 24 O 34 (OH) 12 ]·5.5H 2 O (s) and Na 5 [CrB 24 O 34 (OH) 12 ]·5H 2 O (s) in 1 mol · dm −3 HCl (aq) were measured to be (58.27 ± 0.15) kJ · mol −1 and (130.99 ± 0.33) kJ · mol −1 , respectively. The molar enthalpies of solution of AlCl 3 ·6H 2 O (s) and CrCl 3 ·6H 2 O (s) in (HCl + H 3 BO 3 + NaCl) (aq) were also measured, respectively. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol · dm −3 HCl (aq), together with the standard molar enthalpies of formation for AlCl 3 ·6H 2 O (s)/CrCl 3 ·6H 2 O (s), NaCl(s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of −(21316.0 ± 19.3) kJ · mol −1 for Na 5 [CrB 24 O 34 (OH) 12 ]·5H 2 O (s) and −(21669.7 ± 19.3) kJ · mol −1 for Na 5 [AlB 24 O 34 (OH) 12 ]·5.5H 2 O (s) at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles. The molar enthalpy of formation of Na 5 [GaB 24 O 34 (OH) 12 )]·3H 2 O was estimated as −20662.9 kJ · mol −1 by using a group contribution method on the basis of these measured results.
研究领域:
无机化学
·
物理化学
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高影响因子
Environmental Pollutants and Bioavailability
·
2022
·
IF 2.828
Bairen Yang,Jiajie Wang,Qingqing Shang,Zhuqiu Sun,Yifan Wu
The effects of rhamnolipid chelating La (III) or Nd (III) on m-dichlorobenzene removal and biofilm growth were investigated. The rhamnolipid chelating La (III) or Nd (III) significantly increased the average m-dichlorobenzene elimination capacity by 24% and 29%, respectively, on day 70–130, and the average wet weights of biomass ranged from 11 kg/m3 to 15 kg/m3 in BTFs on day 100–180 at an inlet load of at 47–98 gm3/h and an EBRT of 60s-90s. Microbial community functional genes about biofilm growth and m-dichlorobenzene removal were also increased. In addition, the rhamnolipid chelating La (III) or Nd (III) can improve the membrane permeability, extracellular polymeric substance (EPS) production, catechol 2,3 dioxygenase (C23O) enzyme, and chlorobenzene dioxygenase activity. These results demonstrate that rhamnolipid chelating La (III) or Nd (III) have the potential to improve the performance of BTFs treating hydrophobic and highly toxic VOCs.
研究领域:
环境科学
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微生物学
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·
IF 6.3
Yao-Dong Liu,Kang Du,Xiao-Qiang Song,Chang-Zhi Yin,Jia-Qing Yang,Yi-Yang Cai,Ming-Fei Chen,Ya-Qing Hu,Zi-Hang Chen,Gui-Xin Zhang,Wen-Zhong Lu,Wen Lei
In this study, CaY 2- x M x Ge 3 O 10 ( M = Sm, Yb) ceramics with a P 2 1 /c space group were synthesised. Sm 3+ can fully substitute Y 3+ , whereas the solid solubility limit of Yb 3+ lies between 0.4 and 0.5. The corrected dielectric constant ( ε r-corr ) follows the trend of ε r-cal predicted based on the P-V-L theory, but is different with α D T / V m in CaY 2- x Sm x Ge 3 O 10 (1.2 ≤ x ≤ 2), where significant reductions in distortion of [YO 7 ] (Ave( δ Y − O )). The Q×f values, varying from 43,360±220 GHz to 113,620±680 GHz, are primarily governed by U t , P.F . , and E a . The τ f , varying from −9.6±0.1 ppm/°C to −217.6±2.0 ppm/°C, is influenced by both Ave( δ Y − O ) and fractional contribution of Ge−O bonds to overall susceptibility ( χ (Ge−O)/ χ ). Notably, CaY 1.6 Yb 0.4 Ge 3 O 10 ceramics exhibit a near-zero τ f (−9.6±0.1 ppm/°C) with ε r = 10.36±0.01 and Q×f = 92,540±560 GHz. CaY 1.7 Yb 0.3 Ge 3 O 10 achieves high Q×f of 113,620±680 GHz. CaY 0.8 Sm 1.2 Ge 3 O 10 ceramic demonstrates ε r = 10.31±0.01, Q×f = 50,510 ± 250 GHz, and τ f = −217.6±2.0 ppm/°C.
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CORROSION SCIENCE
·
2016
·
IF 5.154
Zhiyong Hu,Yanbin Meng,Xuemei Ma,Hailin Zhu,Jun Li,Chao Li,Duanlin Cao
Two benzothiazole derivatives, namely 2 - ( n -hexylamino)-4-(3′- N,N -dimethylamino-propyl)amino-6-(benzothiazol-2-yl)thio-1,3,5- s -triazine (BTC 6 T) and 2-( n -octylamino)-4-(3′- N,N -dimethylamino-propyl)amino-6-(benzothiazol-2-yl)thio-1,3,5- s -triazine (BTC 8 T), were synthesized to study their corrosion inhibiting effect against steel in a 1 M HCl solution. The corrosion inhibition efficiency was measured using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization , and weight loss methods. Both inhibitors offered extra stability and higher inhibition efficiencies again steel corrosion than previously reported benzothiazole family inhibitors. These inhibitors can be adsorbed onto surfaces by both physical and chemical means. Finally, quantum chemical parameters were calculated using the density functional theory method (DFT) and the correlation between the theoretical and experimental results are discussed.
研究领域:
腐蚀科学
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材料化学
·
电化学
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理论化学
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表面科学
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 6
·2065-2078
·
IF 4.478
Ou Panpan,Wu Jiawen,Lin Yu,Tan Xuecai,Wu Yeyu,Chen Zhifan,Wei Fucun,Huang Kejing
Chloramphenicol (CAP) is widely used in the food industry and animal husbandry due to its effective antibiotic effect active against gram-positive and gram-negative microorganisms. However, research shows that it can cause serious adverse reactions and side effects in the human body. In order to effectively monitor the residues of CAP, a novel and simple photoelectrochemical (PEC) sensor for sensitive detection of CAP is fabricated based on M-TiO 2 -CdTe QDs/CdS QDs composite. The results show that the prepared M-TiO 2 not only retains the original morphology and structure of MIL-125(Ti), but also exhibits more abundant pore structure and good photoelectrochemical properties. Compared with M-TiO 2 , the as-prepared M-TiO 2 -CdTe QDs/CdS QDs composite exhibits excellent PEC performances including about ninefold enhancement of photocurrent intensity, which is ascribed to the large surface of M-TiO 2 and the introduction of CdTe QDs and CdS QDs. Based on the selective inhibitory effect of CAP in the photocurrent intensity of the M-TiO 2 -CdTe QDs/CdS QDs PEC system, a novel PEC sensor for CAP concentration determination is constructed. The designed PEC sensor demonstrates a linear range from 1 to 140 nmol L −1 with a detection limit of 0.14 nmol L −1 (S/N = 3). Moreover, the method is applied to real milk samples to quantify the CAP residues with spiked recoveries in the range of 96.3–106%, and the possible detection mechanism of the M-TiO 2 -CdTe QDs/CdS QDs PEC system is also discussed. Graphical abstract
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Manfen Liang,Yu Liu,Jie Zhang,Fangyuan Wang,Zhichao Miao,Lechen Diao,Jinglin Mu,Jin Zhou,Shuping Zhuo
The electrochemical CO 2 reduction reaction (CO 2 RR) that transforms CO 2 to CO has attracted great interest. Transition metal nanoparticles encapsulated in nitrogen-doped carbon (M@NC) catalysts exhibit outstanding catalytic performance. However, the role of metal and N species in M@NC catalysts remains unclear. In this work, Co@C, Co@NC, Ni@C, and Ni@NC catalysts were achieved and employed in CO 2 RR. The Ni@NC catalyst exhibits an industry level current density of 220 mA cm −2 and a high Faradaic efficiency of 98% for CO production at − 0.87 V vs. RHE for 100 h. In addition, the N species, especially the pyrrolic-N in the shell of Ni@NC material provide active sites for adsorbing and activating CO 2 molecules, and metal nanoparticles improve the electronic structure of N species, thereby decreasing their ability for radical attack (*COOH, *CO, and *H). Consequently, this work can guide the design of M@NC catalyst for CO 2 RR to CO.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Fei Wu,Mengyun Ling,Lingyun Wan,Pei Liu,Yabin Wang,Qiuyu Zhang,Baoliang Zhang
Herein, we construct two metal–organic frameworks (MOFs) composite nanoflowers (NFs) with anisotropic binary assembled structures by a facile one-pot method. Different from the two-step epitaxial growth method, the anisotropic assembly of the binary MOFs (MOF-5 and MIL-88B) in the mixed system can be realized without preparing the template MOFs. The ions coordinated self-assembling behaviors during the formation of the three-dimensional (3D) structure are clarified. The absorbing mechanisms of the derivative absorber are elucidated. The results indicate that the special hierarchical assembled structure endows absorbers with rich heterogeneous interfaces, porous structure, suitable impedance matching and complementary loss mechanisms. The optimized absorbers FeCoZn@C NFs and FeNiZn@C NFs exhibit outstanding microwave absorption performance. Only with a matching thickness of 1.9 mm, the effective absorbing bandwidth (EAB, reflection loss (RL) < −10 dB) of the absorber covers 6.0 GHz (12–18 GHz, the entire Ku band). The minimum reflection loss (RL min ) reaches −53.1 dB (loss of electromagnetic waves above 99.999%). This study might shed light on the preparation of high-performance microwave absorbers with sophisticated structures.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Lan-Qian Li,Xu-Hong Liu,Yong-Jian Tang,Zhen-Liang Xu
Fully aromatic polyamide (PA) membranes have been studied as nanofiltration (NF) membranes for decades because of their good chemical stability, but most of the membranes suffered from poor permeability and high rejection for monovalent ions. In this paper, an m-phenylenediamine (MPD)-based NF membrane was prepared by alkali activation on a reverse osmosis (RO) membrane. Characterization revealed the different etching paths on RO membranes fabricated by different concentrations of monomers of interfacial polymerization. The looser PA layer of RO membrane fabricated by lower-concentration monomers was easily invaded by NaOH molecules because of the higher molecular weight cutoff of 254 Da, which resulted in the transformation of separation grade from RO to NF. At the same time, the MPD-based NF membrane exhibited superior water permeability and pH resistance compared with a PIP-based membrane, which showed a potential to realize large-scale application in practical industry settings. It also provided a facile method for the preparation of a high-performance NF membrane with good chemical stability.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Bin Li,Shouqin Tian,Jiachen Qian,Senwei Wu,Baoshun Liu,Xiujian Zhao
Thermochromic VO 2 -based smart windows are considered as a highly promising building envelope to reduce building energy consumption. However, the inherent unsatisfactory optical performance hindered its practical applications and nanocomposite films are testified to be the most promising strategy addressing this issue, while uniformly dispersing nanoparticles is often a challenge. Herein, a facile in situ method was proposed to directly fabricate highly dispersed VO 2 nanoparticles (HD-VN) on a glass surface from the VOC 2 O 4 ·xH 2 O aqueous solution to achieve the high-optical performance VO 2 film (HD-VN film). The forming mechanism of HD-VN was fully elucidated and HD-VN was generated via the sintering process from the irregular VO 2 particles derived from the decomposition of polyvinyl pyrrolidone (PVP). The HD-VN film showed excellent luminous transmittance ( T lum ) of 72.5% and solar energy modulation efficiency (Δ T sol ) of 10.1%, the former was attributed to the reduced refractive index which led to a reduced reflectance of HD-VN film, and the latter was ascribed to the localized surface plasmon resonance (LSPR) behavior of the HD-VN. The simple and cost-efficient synthesis strategy would promote the application of VO 2 film in energy-efficient glazing, and also shed light on the structures’ design applied to the field of optics, catalysts, and sensors.
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Crystals
·
2022
·Vol. 12
·期 10
·1339
·
IF 2.67
Hui Han,Ying-Ying Wang,Xing-Chao Yu,Yan-Na Ma,Xuenian Chen
Alkali metal (M = Na, K) salts of the [CB11H12]−anion have attracted increasing attention in many fields such as catalysis and all-solid-state batteries. However, tedious and low-yielding synthetic methods have seriously limited their application in these fields. We developed a facile method for the direct synthesis of the unsolvated potassium and sodium salts of the [CB11H12]−anion in 66% and 68% yields, respectively, by reactions of Na[B11H14] with NaH/NaHMDS (sodium bis(trimethylsilyl)amide), CF3SiMe3in THF and K[B11H14] with KH, CF3SiMe3in DME. This method avoids the exchange of cation and significantly simplifies the reaction setup, thus enabling convenient large-scale synthesis. It is believed that this method will support further application of Na[CB11H12] and K[CB11H12] as solid electrolytes for an all-solid-state battery.Keywords:Na[CB11H12];K[CB11H12];Na[B11H14];K[B11H14];one-pot synthesis
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危险品化学品经营许可证（带存储）