SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Bingning Wang,Yeshuang Wang,Zhen Wang,Song Yang,Chao Yang,Jiawei Kou,Huiling Fan,Ju Shangguan
In this study, we report a simple strategy to enhance the low-temperature catalytic performance of γ-Al 2 O 3 for carbonyl sulfide (COS) hydrolysis by regulating the dissociation of H 2 O. Specifically, tetrabutylphosphonium chloride (TBuPC), an ionic liquid, was introduced onto γ-Al 2 O 3 via ultrasonic impregnation. There was a strong interaction between Cl in TBuPC and Al sites in tetrahedral interstices of γ-Al 2 O 3 , and Al sites in octahedral interstices were acted as main adsorption sites of H 2 O. Additionally, the hydrogen bond Cl···H-O lowered the dissociation energy of H 2 O on Al sites in octahedral interstices of γ-Al 2 O 3 , leading to the generation of abundant basic –OH groups, which served as active sites for COS adsorption and hydrolysis. Consequently, 3TBuPC/γ-Al 2 O 3 achieved 100 % COS conversion at 60 °C, which was 2.05 times higher than that of γ-Al 2 O 3 . The catalytic mechanism of COS hydrolysis over 3TBuPC/γ-Al 2 O 3 involved the following steps: (1) H 2 O was adsorbed on the γ-Al 2 O 3 surface and dissociated, generating H* and basic –OH groups; (2) COS was adsorbed on the –OH sites, forming the intermediate HSCO 2 - ; (3) HSCO 2 - reacted with H* to release CO 2 and H 2 S. This significant enhancement provides a new insight for the design and development of low-temperature hydrolysis catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yongxin Jiao,Shu Wang,Yupu Liu,Xin Li,Wenlong Yang,Shuang Han,Hui Zhang,Jiuxing Jiang
The artificial-photosynthetic semiconductor composites have attracted tremendous attention with respect to their enhanced photocatalytic properties. Herein, we reported the facile synthesis of Zn 0.5 Cd 0.5 S/WO 3 ·H 2 O S-scheme photocatalyst via one-pot in situ hydrothermal strategy. Density Functional Theory (DFT) calculation was employed to reveal the S-scheme photogenerated electron transfer mechanism, and the subsequent experimental characterization further illustrated the path for electron-hole transfer and separation under the effect of S-scheme heterojunction. The mass of WO 3 ·H 2 O accounted for Zn 0.5 Cd 0.5 S/WO 3 ·H 2 O 48 wt% (ZCSW48) was the best high-efficiency S-scheme photocatalyst displayed significant photocatalytic properties on pollution degradation, in detail, with the Cr (VI) photoreduction rate of 2.27 μmol·s −1 ·g −1 cat. and the Rhodamine B (RhB) photooxidation rate of 0.38 μmol·min −1 ·g −1 cat. , respectively. The designed Zn 0.5 Cd 0.5 S/WO 3 ·H 2 O photocatalysts have integrated with the three aspects of photocatalytic efficiencies including the visible light response, prolonged photogenerated carrier lifetime and the sufficient surface active sites due to amount of surface defects , therefore, this work provides more insights into the utilization of green energy for environmental treatment by artificial structured semiconductors.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Pengkun Zhang,Qinhan Wu,Haoyu Wang,Dong-Hau Kuo,Yujie Lai,Dongfang Lu,Jiqing Li,Jinguo Lin,Zhanhui Yuan,Xiaoyun Chen
Herein, we established a Zn 3 (OH) 2 (V 2 O 7 )(H 2 O) 2 /V-Zn(O,S) Z-scheme heterojunction (labeled ZnVO/V-Zn(O,S) with a heterovalent V 4+ /V 5+ states and oxygen vacancies in both phases via a one-step in-situ hydrolysis method. The NaBH 4 regulated the ZnVO/V-Zn(O,S)-3 with rich Vo and suitable n (V 4+ )/ n (V 5+ ) ratio achieved an excellent photocatalytic nitrogen fixation activity of 301.7 μmol/(g·h) and apparent quantum efficiency of 1.148% at 420 nm without any sacrificial agent, which is 11 times than that of V-Zn(O,S). The Vo acts as the active site to trap and activate N 2 molecules and to trap and activate H 2 O to produce the H for N 2 molecules photocatalytic reduction. The rich Vo defects can also reduce the competitive adsorption of H 2 O and N 2 molecules on the surface active site of the catalyst. The heterovalent vanadium states act as the photogenerated electrons, quickly hopping between V 4+ and V 5+ to transfer for the photocatalytic N 2 reduction reaction. Additionally, the Z-scheme heterojunction effectively minimizes photogenerated carrier recombination. These synergistic effects collectively boost the photocatalytic nitrogen fixation activity. This study provides a practical method for designing Z-scheme heterojunctions for efficient photocatalytic N 2 fixation under mild conditions.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Meiling Lei,Jing Sun,Yu Chen,Zixian Cai,Yimin Hu
The hydrotalcites were dispersed in the hexagonal lyotropic liquid crystals (LLCs) composed of 1-hexadecyl-3-alkyl imidazolium bromide ([C 16 imC n ]Br, n = 1, 2 and 3) and H 2 O. The effects of the hydrotalcite concentration and the alkyl chain length of the [C 16 imC n ]Br on the properties and the lubricant performance of the [C 16 imC n ]Br/hydrotalcite hexagonal LLCs were studied by small angle X-ray diffraction measurements, rheology and tribology. Compared with the pure hexagonal LLCs, the incorporation of hydrotalcite into the [C 16 imC n ]Br hexagonal LLCs can increase the interlayer distances and the viscoelasticity of the hybrid hexagonal LLCs gradually. However, the friction coefficient and wear volume decrease firstly and then increase with the increasing of hydrotalcite content. With the increase of the alkyl chain length of the [C 16 imC n ]Br, the viscoelasticity, the interlayer distance and the water permeability of the mixed LLCs gradually increase which decreases the friction coefficient and wear volume at the moderate hydrotalcite content. The mechanism of the effective improvement of lubrication performance of the hybrid hexagonal LLCs is the tribofilm formed by the physical adsorption and tribochemical reaction of [C 16 imC n ]Br/hydrotalcite LLCs on the steel surface.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Huansheng Tan,Shibo Ma,Xiaoyu Zhao,Yushi Li,Chen Zhao,Yujun Zhu
Bimetallic W a CeO x (a = 0.06, 0.12, 0.18, 0.24) catalysts were synthesized for selective catalytic reduction of NO x with NH 3 (NH 3 -SCR). The influences of W on structure, activity and surface properties were investigated by XRF, XRD, Raman, TEM, N 2 adsorption-desorption, H 2 -TPR, O 2 /NH 3 /SO 2 -TPD, XPS, and in-situ DRIFTS. The characterization results show that the W/Ce ratio has a great effect on the NH 3 -SCR activity. The different catalytic activities of W a CeO x are mainly attributed to the acidity change, especially the increase of B-acid content plays a major role in enhancing low temperature activity. W 0.18 CeO x exhibits excellent low-temperature NH 3 -SCR activity, SO 2 /H 2 O resistance and N 2 selectivity with a broad activity window (190–490 °C) with 5%H 2 O. Moreover, good activity window (235–460 °C) can be maintained even the catalyst treated with 5% H 2 O at 800 °C for 12 h, showing especial hydrothermal stability. Thus, it can be summarized that W 0.18 CeO x is regarded as outstanding catalyst for low-temperature NH 3 -SCR of NO.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Dong-qin Bi,Shu-han Li,Xue-jia Zhang,Zi-xiao Zhao,Qi-chao Yang,Zhan-ping Qiao
Two-phase equilibrium of ternary systems of CdBr2–l-proline/(4-OH-l-proline)–H2O at T = 298.15 K is studied. Their isothermal solution equilibrium phase diagrams have been drawn based on the solubility data. Two double salts (Cd(C5H9NO2)Br2·H2O and Cd(C5H9NO3)Br2) have been found by the Schrienemakers method in phase diagrams, and they are all congruently soluble in water. Both of them have been synthesized and characterized by powder XRD and TG-DTG. For the first time, enthalpies of solution of Cd(C5H9NO2)Br2·H2O and Cd(C5H9NO3)Br2 are measured in water, and their standard molar enthalpies of formation at 298.15 K are calculated by designing thermochemical cycles according to the Hess law. By comparison, it is found that the region of infinite dissolution appears in the ternary system of CdBr2–l-proline–H2O at 298.15 K. If the composition of the solution is in this region, there is no crystal when the water evaporates and only a viscous mixture can be obtained.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Zhan-Ping Qiao,Meng-Yao Su,Yuan-Lin Dang,Qi-Chao Yang
The phase diagrams of the Mg(NO 3 ) 2 –Ln(NO 3 ) 3 (Ln = Nd, Sm, Eu, Tb)–HNO 3 –H 2 O systems in the (∼20%) HNO 3 regions at T = 298.15 K were determined by using an isothermal solution saturation method. The Schreinemaker’s wet residues method was used to determine the compositions of solid-phases. Both Mg(NO 3 ) 2 –Nd(NO 3 ) 3 –HNO 3 –H 2 O and Mg(NO 3 ) 2 –Sm(NO 3 ) 3 –HNO 3 –H 2 O systems are complicated with three equilibrium solid phases Mg(NO 3 ) 2 ·6H 2 O, Mg 3 Ln 2 (NO 3 ) 12 ·24H 2 O and Ln(NO 3 ) 3 ·6H 2 O (Ln = Nd, Sm). But the systems Mg(NO 3 ) 2 –Eu(NO 3 ) 3 –HNO 3 –H 2 O and Mg(NO 3 ) 2 –Tb(NO 3 ) 3 Tb–HNO 3 –H 2 O are simple eutonic type. The two new solid-phase compounds Mg 3 Nd 2 (NO 3 ) 12 ·24H 2 O and Mg 3 Sm 2 (NO 3 ) 12 ·24H 2 O are congruently soluble in an average medium of ∼20 mass % HNO 3 , and they were identified and characterized by the methods of powder X-ray diffraction, X–ray diffraction single crystal structure analysis, and thermogravimetric/differential thermogravimetric. The XRD diffraction patterns for the two new solid-phase compounds are identical due to their isomorphic structure. They belong to hexagonal systems, with space group R 3 . For Mg 3 Nd 2 (NO 3 ) 12 ·24H 2 O, a = b = (1.0993 ± 0.0005) nm, c = (1.7211 ± 0.0007) nm, V = (1.8012 ± 0.0013) nm 3 , D c = (4.2532 ± 0.0024) g·cm −3 , Z = 3; for Mg 3 Sm 2 (NO 3 ) 12 ·24H 2 O, ( a = b = 1.1198 ± 0.0004) nm, c = (1.7257 ± 0.0006) nm, V = (1.8742 ± 0.0011) nm 3 , D c = (4.1201 ± 0.0012) g cm −3 , Z = 3. The standard molar enthalpies of solution of the compounds Mg 3 Nd 2 (NO 3 ) 12 ·24H 2 O and Mg 3 Sm 2 (NO 3 ) 12 ·24H 2 O in water (aq) were measured to be (101.26 ± 0.77) kJ mol −1 and (80.27 ± 0.81) kJ mol −1 , and their standard molar enthalpies of formation were calculated to be – (12214.13 ± 2.5) kJ mol −1 and – (12183.6 ± 2.5) kJ mol −1 , respectively.
研究领域:
化学
·
物理化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Jie Ding,Yusheng Wu,Shuyu Jia,Yuying Feng,Ke Li,Min Fang,Jianchun Bao,Yong Wu
Three 3D, anionic Cd(II) porphyrinic metal-organic frameworks (PMOFs), 1(3.5:1)-2d-120 ([Cd 3·2 (H 2 TCPP) 2 ][(CH 3 ) 2 NH 2 ] 1.6 ), its Li + -exchanged product (e.g. Li + -1-120 , formula: [Cd 3·2 (H 2 TCPP) 2 ]Li 1.6 ) and 1(10:1)-4d-120 ([Cd 3·7 H 2 TCPP) 2 ][(CH 3 ) 2 NH 2 ] 0.6 ) were synthesized, all of which have the same PXRD pattern. Their VB and CB band-edge positions were determined in nonaqueous electrolyte as −0.59, 1.12; −0.60, 1.11; and −0.60, 1.16, respectively. Their light absorption properties in the range of 250–2500 nm were obtained by UV–Vis-IR reflectance spectroscopy. Transient photocurrent responses, electrochemical impedance spectra (EIS) and solid state photoluminescence (PL) spectra of the three PMOFs were obtained. When irradiated using light of 430 nm and −0.5-0.5 bias potentials (versus Ag/Ag + electrode in CH 3 CN), both positive and negative photocurrent were observed. Mott-Schottky plot measurements indicate that they are intrinsic semiconductors. Although these three PMOFs can photocatalytically reduce CO 2 to CO in the absence of Ru (bpy) 3 Cl 2 , their catalytic abilities are very weak. The roles of these PMOFs in CH 3 CN/trimethylamine (TEA) or triethanolamine (TEOA)/H 2 O (400 μL)/Ru (bpy) 3 Cl 2 . 6H 2 O was found to be mainly cocatalysts, and Ru (bpy) 3 Cl 2 was the actual photocatalyst in the presence of small amounts of water (0–400 μL). These PMOFs act as cocatalysts due to the increased reducing power upon light irradiation . Reducing the charge of the framework can reduce the efficiencies of the photocatalytic CO 2 reduction to CO. Li + -1-120 was found to be able to react with Ru (bpy) 3 Cl 2 when sufficient amounts of H 2 O are present in CH 3 CN and TEA system, preventing the photocatalytic property of Ru (bpy) 3 Cl 2 to be released. In addition, we found that TEOA is a worse reducing agent than TEA, leading to much lower photocatalytic efficiency of the system. Mechanisms were proposed for reactions occurred in CH 3 CN/TEA (or TEOA)/H 2 O (400 μL)/Ru (bpy) 3 Cl 2 . 6H 2 O/PMOF system, and strategies to improve the photocatalytic performance of CO 2 reduction to CO were proposed.
✓ 已验证
DOI
高影响因子
Journal of the Iranian Chemical Society
·
2022
·Vol. 19
·期 6
·2543-2551
·
IF 2.271
Ge Dandan,Zhang Yi,Deng Xiujun,Yuan Lin
In this study, a zinc-based MOF material-[Zn 2 (btc)(atrz)(H 2 O) 2 ]·2H 2 O (btc = benzene-1,2,4-tricarboxylic acid, artz = 4-amino-1,2,4-triazole) was designed and applied as a sorbent for the vortex-assisted micro-solid-phase extraction (VA-µ-SPE) of UV filters from water and toner samples, followed by high performance liquid chromatography-diode array detector determination. Parameters affecting VA-µ-SPE such as sorbent amount, desorption solvent, vortex time, desorption time, solution pH and salt concentration were optimized. Under the optimized conditions, linearity of the UV filters was obtained in the range of 5(10)–1000 ng mL −1 , and the correlation coefficient was higher than 0.9959. The limits of detection ranged between 1.5 and 3.2 ng mL −1 and limits of quantification were in the range of 4.2–10 ng mL −1 . The relative standard deviations were in the range of 2.3–7.1%. The recoveries for the spiked real samples were in the range of 90.7–111.3% with relative standard deviation less than 7.2%. It proved to be a fast, accurate and convenient method for extraction of UV filters from different matrices.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）