Catalysis Science & Technology
·
2014
·Vol. 4
·期 12
·4308-4312
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IF 4.76
Ran Ma,Cheng-Bin Huang,An-Hua Liu,Xue-Dong Li,Liang-Nian He
An environmentally benign CO2/glycol reversible acidic system was developed for the iron(III)-catalyzed aerobic oxidative iodination of electron-rich aromatics without the need for any conventional acid additive or organic solvent. Notably, moderate to high isolated yields (up to 97%) of the aryl iodides were attained with comparable regioselectivity when ferric nitrate nonahydrate was used as the catalyst with molecular iodine under 1 MPa of CO2.
研究领域:
有机化学
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环境科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lei Cai,Xiang Song,Cheng-Bao Liu,Lan-Yue Cui,Shuo-Qi Li,Fen Zhang,M. Bobby Kannan,Dong-Chu Chen,Rong-Chang Zeng
This work reports the design and preparation of novel organic (polyvinyl alcohol, PVA)-inorganic (neodymium nitrate, Nd(NO 3 ) 3 ) hybrid coatings on micro-arc oxidation (MAO) coating for magnesium (Mg) alloy corrosion protection . X-ray diffractometer , X-ray photoelectron spectroscopy, fourier transform infrared spectroscopy , field emission scanning electron microscope , Energy Dispersive X-ray spectrometer and surface roughness were applied to characterize the chemical composition and surface morphology of the coatings. The corrosion resistance of the coatings was evaluated by electrochemical and salt spray tests. The results suggested that the formation of PVA-Nd 3+ and PVA-Mg 2+ complexes promoted the enrichment of Nd 3+ on the surface, and thereby improved the sealing quality and compactness of the coating. Interestingly, when the coating was damaged, the Nd 3+ ions were transformed to their carbonates and covered the active sites, and thus exhibiting self-healing function. Further, the corrosion resistance of PVA-Nd 3+ modified MAO composite coating on AZ31 Mg alloy was improved.
研究领域:
材料科学
·
腐蚀与防护
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DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Qiongyuan Zhang,Yanping Wang,Jilong Han,Haining Liu,Huifang Zhang,Zhijian Wu,Siyuan Zhang,Wenjie Han,Xiushen Ye
Layered double hydroxides (LDHs) have garnered significant attention from researchers in the field of adsorption due to their unique laminated structures and ion exchange properties. LDHs with various anion intercalation showed different adsorption effects on adsorbing ions, but the corresponding adsorption mechanisms are ambiguous. In this study, three types of NiAl-LDHs were synthesized, utilizing NO3–, CO32–, or Cl– as the interlayer anions. Batch tests were conducted to study their adsorption performances for Br–. Among them, the LDH with a NO3– intercalation layer exhibited the highest adsorption capacity for Br–, reaching up to 1.40 mmol g–1. The adsorption kinetics, mechanism, and renewability of these NiAl-LDHs were systematically compared. As a result, the type of Br– adsorption by all three materials was single molecular layer chemisorption. Moreover, the thermodynamic results of adsorption suggested that the adsorption of Br– was a spontaneous exothermic process. X-ray photoelectron spectroscopy, X-ray diffraction, and point of zero charge analysis collectively indicated that the adsorption of Br– by LDHs primarily occurred through interlayer ion exchange and electrostatic interactions. Structural characterizations of the adsorbents revealed that Br– entered the interlayers of the three LDHs, causing varying degrees of reduction in the interlayer spacing. Density functional theory calculations indicated that the interlayer binding energy of LDH with NO3– intercalation was the lowest, thereby making it more susceptible NO3– to be exchanged with Br–. Finally, the stability of the NiAl-LDHs was studied. The NiAl-LDHs retains a high removal efficiency of Br– even after 5 cycles of adsorption and desorption.
研究领域:
环境科学
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材料科学
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化学工程
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表面化学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Hui Yu,Xinyu Li,Chuanqi Geng,Xiaojia Wu,Fan Zhang,Shichao Tian,Zhiyong Zhou,Zhongqi Ren
The separation of aromatic and aliphatic hydrocarbons is one of the most challenging and energy-consuming operations in the petrochemical industry. In this study, a number of N -methylpyrrolidone (NMP)-based coordinated ionic liquids (ILs) with various metal salts were prepared and their separation performances were investigated. Among these coordinated ILs, NMP-0.1Fe(NO 3 ) 3 ·9H 2 O showed high selectivity and was used to separate toluene from n -heptane or cyclohexane. Fourier-transform infrared spectroscopy was used to verify that the synthesis of NMP-0.1Fe(NO 3 ) 3 ·9H 2 O was achieved. The toluene distribution coefficient and selectivity were 0.20 and greater than 70, respectively, for a 10 mol% toluene/ n -heptane system, and 0.20 and 23.5, respectively, for a 20 mol% toluene/cyclohexane system. Changing the extraction temperature had little effect on the separation performance. The effects of the solvent dosage, initial concentrations of system components, and regeneration times were also investigated. Experimental liquid–liquid equilibrium data for the studied ternary systems were correlated with the non-random two-liquid model. The results show that NMP-0.1Fe(NO 3 ) 3 ·9H 2 O has potential industrial applications.
研究领域:
化学工程
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石油化学
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材料科学
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Zijing Guo,Xin Chen,Jiacheng Hang,Zhengzhang Li,Caihua Zhong,Ahui Sun,Jihui Li,Shuying Xu
A novel oxidative magnetization, involving phosphomolybdic acid and Fe(NO 3 ) 3 co-promoted pyrolysis, was established to manufacture highly adsorptive magnetic biochars for adsorbing aqueous tetracycline, methylene blue, and Cr 6+ . The modification of phosphomolybdic acid greatly boosted the formation of γ-Fe 2 O 3 and oxygen containing groups with enhancement of specific surface area and pore volume at 400 °C. Importantly, γ-Fe 2 O 3 was stably fixed on surface in quasi-nanoscale. The oxidized magnetic biochar displayed 631.53, 158.45, 155.13 mg/g adsorption capabilities for tetracycline, methylene blue, and Cr 6+ with 22.79 emu/g saturation magnetization, respectively. Oxygen containing groups and quasi-nanoscale γ-Fe 2 O 3 served as key adsorption sites for these pollutants. A general oxidative magnetization was established for manufacturing high-performance magnetic biochar through phosphomolybdic acid/Fe(NO 3 ) 3 co-promoted pyrolysis at relatively low temperature.
研究领域:
环境科学
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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
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yaqi Ding,Neng Gao,Yongping Wu,Yongmei Xuan,Guangming Chen
Calcium chloride (CaCl2) aqueous solution as a liquid desiccant has the disadvantage of low vapor pressure and easy crystallization. Ionic liquids (ILs) such as [Emim]Cl, [Emim]Ac, and [Emim]Br have been verified to have a good ability to reduce the vapor pressure. In this paper, the vapor pressures of four kinds of CaCl2 + ILs + H2O were measured, which were CaCl2 + [Emim]Br + H2O (mass ratio CaCl2/[Emim]Br = 2:1) at temperatures of between 311.10 and 394.45 K, CaCl2 + [Emim]Cl + H2O (mass ratio CaCl2/[Emim]Cl = 2:1) at temperatures of between 306.58 and 393.89 K, CaCl2 + [Emim]Ac + H2O (mass ratio CaCl2/[Emim]Ac = 2:1) at temperatures of between 304.93 and 382.71 K, and CaCl2 + [Emim]NO3 + H2O (mass ratio CaCl2/[Emim]NO3 = 2:1) at temperatures of between 312.46 and 391.80 K, with the mass fraction of solute ranging from 0.2 to 0.5. The Antonie-type equation was used to fit the measured results. The average absolute relative deviation (AARD %) values of the measured vapor pressures and calculated vapor pressures were 0.52, 0.40, 0.33, and 0.27%, which showed good consistency and accuracy. Comparing the vapor pressures of the different solutions at the same concentration, the following order of the four anions with the ability to reduce the vapor pressure of CaCl2 + H2O can be drawn at a mass fraction of 0.4: Br– > Cl– > NO3– > Ac–.
研究领域:
化学工程
·
热力学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 32
·17442-17450
·
IF 12.732
Yintong Zhang,Feng Du,Ruyi Wang,Xintong Ling,Xiaoyong Wang,Qing Shen,Yujie Xiong,Tao Li,Yong Zhou,Zhigang Zou
The electrocatalytic nitrogen oxidation reaction (NOR) is a promising alternative to the industrial synthesis of nitrate. However, with the enhancement of NOR activity by modification methods, the competitive oxygen evolution reaction (OER) is always improved simultaneously. Here, a hybrid electrocatalyst composed of Au nanoparticles and oxygen vacancy-enriched niobium oxide nanobelts (Au–Nb2O5−x) was prepared on niobium foil for N2 fixation into NO3−. The results of X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) demonstrate that electron transfer occurs between Au nanoparticles and the oxygen vacancies in Nb2O5−x nanobelts, which adjusts the electronic structures of oxygen vacancies near the Au/Nb2O5−x interface. Electrochemical and N2 temperature-programmed desorption (TPD) tests indicate that the optimization of the electronic structure suppresses the activity of the competitive OER on oxygen vacancy sites and facilitates nitrogen adsorption on the surface of Au–Nb2O5−x, which significantly enhances the NOR performance of the electrocatalyst.
研究领域:
电化学
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材料科学
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催化化学
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DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Hai Liang,Wanting Wang,Haiyan Liu,Xinzhong Deng,Dan Zhang,Yuxuan Zou,Xuehua Ruan
Engineering magnesium oxide (MgO)-modified biochar (MgO-biochar) with high porosity and active MgO load is a feasible pathway to enhance phosphate adsorption capacity. However, the blockage to pores caused by MgO particles is ubiquitous during the preparation, which seriously impaired the enhancement in adsorption performance. In this research, with the intent to enhance phosphate adsorption, an in-situ activation method based on Mg(NO 3 ) 2 -activated pyrolysis technology was developed to fabricate MgO-biochar adsorbents with abundant fine pores and active sites simultaneously. The SEM image revealed that the tailor-made adsorbent has well-developed porous structure and abundant fluffy MgO active sites. Its maximum phosphate adsorption capacity was coming up to 1809 mg/g. The phosphate adsorption isotherms are in accordance well with the Langmuir model. The kinetic data, which agreed with the pseudo-second-order model, indicated that chemical interaction is existing between phosphate and MgO active sites. This work verified that the phosphate adsorption mechanism on MgO-biochar was composed of protonation, electrostatic attraction, monodentate complexation and bidentate complexation. In general, the facile in-situ activation method using Mg(NO 3 ) 2 pyrolysis illuminated biochar activation with fine pores and highly efficient adsorption sites for efficient wastewater treatment .
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
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Wenjie He,Jiazhen Liao,Lin Jing,Xiao Zhang,Rong Xiao,Peng Chen,Xing'an Dong,Wendong Zhang,Yan Zou,Yuechang Wei
Herein, Br − and Bi 0 co-modified Bi 2 WO 6-x nanosheets were synthesized for efficient photocatalytic NO removal. Plasmonic metallic Bi 0 markedly enhanced visible light absorption, and the Br − -Bi 0 synergistic interaction facilitated efficient separation and migration of photogenerated carriers. Consequently, the optimal catalyst achieved a maximum visible-light-driven NO removal efficiency of 53.1% with near-zero toxic NO 2 accumulation, significantly outperforming pristine Bi 2 WO 6-x (4.6%). Quenching experiments reveal that NO activation and oxidation are dominated by photogenerated e − and •O 2 − radicals, while photogenerated h + drives the subsequent deep oxidation of NO 2 . In-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with density functional theory (DFT) calculations confirm the coexistence of direct (NO → NO − → NO 3 − ) and indirect (NO → NO 2 − → NO 3 − ) NO deep oxidation pathways. The Br − -Bi 0 synergy promotes the NO 2 − -to-NO 3 − step, effectively suppressing toxic NO 2 accumulation. This work provides mechanistic insights into the design of advanced photocatalysts for safe and efficient atmospheric pollutant purification.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 4
·3011-3023
·
IF 3.553
Wang Jing,Li Jing,Liu Yuanyuan,Wang Meiri,Cui Hongtao
The cycling stability of electrode materials is a key for Faraday supercapacitors (FSs), especially the structure-unstable Ni(OH) 2 . There exist various strategies for stabilizing the structure of Ni(OH) 2 such as cobalt ions doping and mechanical support from substrate. However, these strategies have their own disadvantages. On the other hand, the combination of two or more strategies has the serious issues in materials synthesis. In this work, a branched nanosheets-interlaced structure of Co 2+ /Co 3+ -doped Ni(OH) 2 is built by a method of precursor template, which effectively applies two strategies including ions doping and self-supportive structure. Due to the synergistic contribution of these two strategies, the cycling stability of as-prepared material is significantly enhanced. This material also presents excellent high-rate capacity, and the as-assembled asymmetric supercapacitors (ASCs) show both high energy and power densities. These results prove that the effective combination of ions doping and self-supportive structure strategies is a promising route for the preparation of Ni(OH) 2 -based electrode materials with high performance.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Dongdong Yan,Junbo Feng,Shuo Li,Yufei Yang,Xi Yang,Xiaofei Shi,Meng LI,Yadong Zhang
A bimetallic Ni-Pt catalyst (6Ni-Pt-HMS) was designed for the dehydrogenation of 1,2-cyclohexanediol (CHD) to catechol. The hexagonal mesoporous silica (HMS) as support, loaded with platinum and nickel by one-pot and incipient-wetness impregnation method, respectively. [Ni(en) 3 ](NO 3 ) 2 is used as the precursor of nickel. The physi-cochemical properties of the catalysts were examined by XRD, BET, SEM and TEM techniques. The effect of ethylenediamine on nickel dispersion during impregnation was studied by comparing with the traditional precursor (nickel nitrate). FTIR and TGA results showed that the presence of ethylenediamine modifies the behavior of nickel during impregnation and calcination . The activity and stability of the catalysts were evaluated on a fixed-bed, revealing the influence of mesoporous structure, ethylenediamine, and platinum on reaction. The 6Ni-Pt-HMS catalyst, with the conversion of CHD is 100 %, the selectivity of catechol as high as 99.7 % with the liquid hourly space velocity (LHSV) is 9 h −1 , and a long-term stability. The deactivation mechanism of the spent catalyst was analyzed by BET, TGA, SEM, TEM-EDX and ICP-OES.
研究领域:
化学工程
·
催化材料
·
纳米材料
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Aijun Cai,Aiying Guo,Liqaing Du,Yanling Qi,Xiuping Wang
In this paper, poplar leaf is used as a template to synthesize hierarchical AgCl-Ag-ZnO composites via a calcination method. Zn(NO 3 ) 2 and AgNO 3 are selected as precursors. During the calcination of the templates, Zn 2+ ions react with oxygen to produce ZnO nanoparticles (NPs), Cl − ions in leaf cells combine with the external Ag + ions to form AgCl, and Ag + ions are reduced by reducing agents in leaf to Ag NPs. The morphology, structure and visible-light response of the as-prepared hierarchical AgCl-Ag-ZnO composites are determined. The composites exhibit a strong photocatalytic activity toward the degradation of Rhodamine B (RhB) under visible-light irradiation. The AgCl-Ag-ZnO composites display an enhanced photocatalytic activity, compared with the leaf-templated AgCl-Ag and ZnO. A photocatalytic mechanism is proposed, based on the efficient separation of photoexcited electron-hole pairs due to the surface plasmon resonance (SPR) effect of metal Ag.
研究领域:
材料科学
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化学
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）