JOURNAL OF CHEMICAL THERMODYNAMICS
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2024
·
IF 2.2
Yufeng Tang,Qichao Yang,Zhanping Qiao
The phase equilibrium of ternary systems RbX/CsX + CuX 2 + H 2 O (X = Cl, Br) at T = 298.15 K were investigated by the isothermal dissolution equilibrium method, in which the composition of equilibrium solid phases was determined by the Schreinemaker’s wet residue method. In the system RbCl + CuCl 2 + H 2 O, there were three crystallization regions corresponding to RbCl, Rb 2 CuCl 4 ·2H 2 O and CuCl 2 ·2H 2 O, respectively. Five crystallization fields corresponding to CsCl, CsCuCl 3 , Cs 3 Cu 2 Cl 7 ·2H 2 O, Cs 2 CuCl 4 and CuCl 2 ·2H 2 O were formed in the system CsCl + CuCl 2 + H 2 O. The ternary system RbBr + CuBr 2 + H 2 O had three crystalline regions corresponding to RbBr, Rb 2 CuBr 4 ·2H 2 O and CuBr 2 . In the system CsBr + CuBr 2 + H 2 O, the solid-phases of CsCuBr 3 , Cs 2 CuBr 4 , besides CsBr and CuBr 2 , were discovered. The results were compared with available literature data for cesium bromide/copper bromide salt-water system. The seven new solid phase were characterized using the X-ray diffraction method and thermogravimetric/differential analysis. The dissolution enthalpies of Rb 2 CuCl 4 ·2H 2 O, Rb 2 CuBr 4 ·2H 2 O, CsCuCl 3 , Cs 3 Cu 2 Cl 7 ·2H 2 O, Cs 2 CuCl 4 , CsCuBr 3 and Cs 2 CuBr 4 at T = 298.15 K were measured. Their standard enthalpies of formation were obtained, and the results were in order with −(1714.4 ± 3.2) kJ·mol −1 , −(1533.6 ± 3.3) kJ·mol −1 , −(697.8 ± 3.1) kJ·mol −1 , −(2418.9 ± 6.1) kJ·mol −1 , −(1134.8 ± 3.2) kJ·mol −1 , −(563.5 ± 3.2) kJ·mol −1 and −(966.2 ± 3.3) kJ·mol −1 , respectively.
研究领域:
物理化学
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无机化学
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热力学
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
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IF 8.198
Huiying Liu,Ruxangul Jamal,Tursun Abdiryim,Rena Simayi,Lielie Liu,Yajun Liu
In this paper, carboxylated cellulose (CLC) dissolved in [BMIM]Cl as a soft template combined with the functional group (−NH2, −SH)-grafted poly(3,4-ethylene dioxythiophene) (PEDOT) derivatives was synthesized by an in situ polymerization method. Structural analysis revealed that CLC increased the degree of conjugation of the polymers in the composites and also led to the formation of the fibrous and sheet structure of the composite. The results of the electrochemical performance measurements revealed that the electrode modified by PEDOT-MeNH2/CLC and PEDOT-MeSH/CLC had detection limits (S/N = 3) of 0.38(0.1–380 μM) and 0.042(0.02–520 μM) for the detection of guanine (G), while for the detection of uric acid (UA), the corresponding detection limits (S/N = 3) were 0.255(5–400 μM) and 0.085(0.4–650 μM). The PEDOT-MeSH/CLC-based electrochemical sensor also possessed a wide linear response with the detection limits of 0.077(0.6–620 μM) and 0.144(0.2–460 μM) for the simultaneous detection of UA and G, respectively.
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RSC Advances
·
2018
·Vol. 8
·期 34
·18784-18791
·
IF 2.936
Yuyan Xiao,Xirong Huang
Via heating first and then cooling, binary ionic liquid (IL) mixture of N-methyl-2-pyrrolidonium methylsulfonate ([HNMP][CH3SO3]) and 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) could form a liquid at room temperature. The glass-transition temperature (Tg) characterized by DSC depends on its composition with Tg being as low as −63 °C. The physicochemical properties of the binary IL mixtures also vary with the composition. With the increase of the mole fraction of [Bmim]Cl, the hydrogen-bond accepting ability (β) of the binary IL mixture increases, but the hydrogen-bond donating ability (α) deceases. In this binary IL mixture, fructose could be effectively converted into 5-hydroxymethylfurfural (HMF) at room temperature. The HMF yields at a given time are found to be well correlated with the physicochemical properties of the binary mixture, especially the α and β values. Under specified conditions, the present IL mixture as medium for fructose dehydration into HMF is comparable to the medium formed by ILs and alcohol, where the alcohols have negative effect on the HMF formation.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
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IF 6.216
Peng Hu,Xiaopeng Liang,Muhammad Yaseen,Xiaodan Sun,Zhangfa Tong,Zhongxing Zhao,Zhenxia Zhao
A novel mechano-chemical strategy using dopamine to modify UiO-66(Zr) by N-coordination was proposed to enhance its competitive adsorption for acetaldehyde, chlorobenzene/H 2 O, both thermodynamically and kinetically. The newly synthesized material was characterized by SEM, EDX, XPS, PXRD, FT-IR, TGA/DTG and BET techniques. Results showed that N was successfully grafted into UiO-66(Zr) frameworks through coordination interaction with Zr-O clusters resulting in M-UiO-66(Zr-N 3.0 ). The obtained M-UiO-66(Zr-N 3.0 ) exhibited a significant increase in adsorption of chlorobenzene (4.94 mmol/g) and acetaldehyde (9.42 mmol/g) compared to parent UiO-66(Zr) and UiO-66(Zr)-NH 2 . The H 2 O adsorption uptake of M-UiO-66(Zr-N 3.0 ) decreased by 20% that of UiO-66(Zr) and 47% of UiO-66(Zr)-NH 2 indicating higher hydrophobicity of the modified material. Kinetic performance indicated that diffusivity of chlorobenzene on M-UiO-66(Zr-N 3.0 ) was about 7.8 and 40 times higher than that of the parent UiO-66(Zr) and UiO-66(Zr)-NH 2 respectively and 15.4 times higher than that of H 2 O on itself. Based on the results, the current N-modification strategy can be deemed as an efficient way to improve MOFs competitive adsorption towards VOCs under humid conditions and it might play active role in industries involving adsorbent applications.
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BIOTECHNOLOGY AND BIOENGINEERING
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2024
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IF 3.5
Han-Yu Liu,Pan Ning,Feng Qian,Yao-Wu Wang,Hai-Min Zhang,Pu Wang
Flavin-dependent halogenase (FDH) is highly prized in pharmaceutical and chemical industries for its exceptional capacity to produce halogenated aromatic compounds with precise regioselectivity. This study has devised a multi-enzyme self-assembly strategy to construct an effective and reliable in vitro coenzyme cycling system tailored for FDHs. Initially, tri-enzyme self-assembling nanoclusters (TESNCs) were developed, comprising glucose dehydrogenase (GDH), flavin reductase (FR) and FDH. The TESNCs exhibited enhanced thermal stability and conversion efficiency compared to free triple enzyme mixtures during the conversion of L -Trp to 6-Cl- L -Trp, resulting in a 2.1-fold increase in yield. Subsequently, an ordered co-immobilization of GDH, FR, and FDH was established, further amplifying the stability and catalytic efficiency of the FDH coenzyme cycle system. Compared to the free TESNCs, the immobilized TESNCs demonstrated a 4.2-fold increase in catalytic efficiency in a 5 mL reaction system. This research provides an effective strategy for developing a robust and efficient coenzyme recycling system for FDHs.
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高影响因子
Foods
·
2025
·Vol. 14
·期 18
·3236
·
IF 5.1
Xiaoyong Huang,Huiting Yang,Chenli Wang,Shiqi Yan,Xiaomin Ren,Zilong Sun
The relentless spread of antimicrobial resistance poses a severe threat to global public health, food safety, and environmental security. Natural products with potent antimicrobial activity offer prospective substitutes for traditional antibiotics and chemical preservatives. Here, we demonstrate that pterostilbene (PT), a natural dietary compound, exhibits rapid lytic activity against methicillin-resistantStaphylococcus aureus(MRSA). PT displayed metabolism-independent bactericidal effects, effectively eradicating dormant persister cells within one hour, though its activity was partially attenuated under anaerobic conditions. Mechanistically, PT disrupted membrane integrity by increasing permeability, dissipating membrane potential, depleting cellular ATP, and suppressing reactive oxygen species (ROS) generation. Its efficacy was modulated by membrane phospholipid composition, with phosphatidylglycerol (PG) and cardiolipin (CL) critically influencing antimicrobial potency. Crucially, PT robustly inhibited MRSA biofilm formation in milk. These findings highlight PT’s potential as a structurally stable, natural antimicrobial for controlling resilient MRSA, particularly against biofilm-associated and persister subpopulations in food systems.
研究领域:
微生物学
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抗菌研究
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食品安全
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天然产物
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生物化学
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
·
IF 2.4
Ziyu Zhuang,Manman Zhang,Dandan Gao,Wolfgang Voigt,Dongdong Li,Haitao Feng
Previously, the formation of a stable adduct 2H3BO3·3CsCl (BC) was observed in CsCl(aq) but not in RbCl(aq). The phase equilibria of the H3BO3 + RbCl + CsCl + H2O system were studied to assess the potential for selective separation of Cs from Rb. Solubility isotherms were determined experimentally. Appropriate liquid composition ranges were preselected using modeling with ISLEC’s equilibrium software. Schreinemakers’ wet solid method, XRD, Raman and IR spectra, Roozeboom’s plots, and SEM-EDS were applied to identify the four phase regions H3BO3, 2H3BO3·3(Cs,Rb)Cl (Bss), (Rb,Cs)Cl, and (Cs,Rb)Cl. Notably, in the presence of RbCl, the BC phase incorporates Rb+, forming a substitutional solid solution, Bss, which inhibits selective separation of CsCl. Roozeboom’s plot analysis revealed that RbCl exhibits higher solubility in the Bss phase compared to the (Cs,Rb)Cl solid solution. The separation factor βCs/Rb between the solid Bss phase and the corresponding solution was 2.0, significantly lower than that of (Cs,Rb)Cl (βCs/Rb = 9.5) in the ternary system without H3BO3. This indicates a stronger coordination between CsCl and H3BO3 relative to that of RbCl in the ternary system without H3BO3. The above understanding provides new strategies designing novel B–OH compounds to enhance Cs/Rb separation efficiency in aqueous systems.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yong Liu,Yong Chen,Yufeng Da,Fei Xie,Jianlong Wang
Herein, we report an integrated coagulation/ photo-Fenton (CPF) process for advanced treatment of mature landfill leachate using nascent aluminum ions as coagulant and hydrogen peroxide (H 2 O 2 ) as oxidant for Fenton reaction , which were in-situ produced by a novel chlorine and nitrogen co-doped aluminum-graphite (Cl, N-Al-Gr) composite. The coagulation of the MBR-treated landfill leachate was performed by nascent aluminum ions generated in Cl, N-Al-Gr/O 2 system; and the resulting coagulation effluent was treated by photo-Fenton oxidation in the presence of ultraviolet (UVA). The Cl, N-Al-Gr composite exhibited excellent performance for in-situ H 2 O 2 production (813.9 mg/L). The humic substances in landfill leachate could promote the cycle of Fe 3+ /Fe 2+ , and the removal efficiency of total organic carbon (TOC) and color was 88.1% and 97.6%, respectively under the optimized condition. The current study suggested that “coagulation + Fenton” process using nascent Al 3+ as coagulant and in-situ generated H 2 O 2 for Fenton oxidation could be a new way for wastewater treatment .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Haitao Zhou,Zhizhuo Yang,Xueqin Wu,Kun Huang
The separation process in hydrochloric acid environments is determined by the interfacial chemistry of the acid. However, the surface species of concentrated acids are complex. The effect of dominant species on the surface of concentrated acids and their dissociation behavior on interfacial separation has been the focus of academic debate. The extraction and separation of two typical anions, PdCl 4 2− and PtCl 6 2− , with different hydration characters on the surface of concentrated hydrochloric acid were investigated by thin layer extraction (TLX). A new phenomenon was discovered that the effect of hydrochloric acid concentration, extractant concentration, organic film thickness, and shear flow rate on the extraction of easily hydrated PdCl 4 2− anions is greater than that of hardly hydrated PtCl 6 2− . However, during the conventional SX process, the phenomenon cannot be observed due to the continuous dispersion and aggregation of oil droplets. It found that HCl molecules only dissociate into solvated H 3 O +… Cl − ion pairs on the surface of concentrated hydrochloric acid, but not H 3 O + and Cl − ions respectively. The concentration of dissociated H 3 O + ions at the interface is lower than that in the bulk phase. The protonation of the A336 molecule promotes the migration of dissociated H 3 O + ions in the bulk phase towards the interface. Because the PdCl 4 2− anions are more likely to be hydrated than PtCl 6 2− anions and combine with H 3 O + ions, the orderly migration of H 3 O + ions in the laminar boundary layer towards the interface drives the mass transfer of easily hydrated PdCl 4 2− anions. The anion exchange between PdCl 4 2− and Cl − ions associated with the A336 molecules results in a higher concentration of Cl − ions enriched at the interface than that in the bulk phase. The migration of easily hydrated Cl − ions towards the bulk phase would drag the water molecules around PtCl 6 2− anions and therefore inhibit the mass transfer of PtCl 6 2− anions. The orderly reverse migration of H 3 O + and Cl − ions enhances the separation between easily hydrated PtCl 6 2− and hardly hydrated PdCl 4 2− anions. This study offers a new perspective on the dissociation of species on the surface of concentrated hydrochloric acid and its impact on separation processes.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Yaqi Ding,Neng Gao,Nian Li,Guangming Chen,Yongmei Xuan
The vapour-liquid equilibrium (VLE) data of four ternary solutions HCOOK + [Emim]Ac /[Emim]Br / [Emim]Cl / [Emim]NO 3 + H 2 O were measured using the boiling method at the temperatures from 305.78 K to 387.08 K, at solute (HCOOK + IL) mass fractions ( w ) between 0.2 and 0.5. A total of 234 data points ( w = 0 included) were obtained and correlated with empirical Antoine-type equations. The absolute average relative deviations (AARD %) between calculated and measured vapour pressures were 0.58%, 0.50%, 0.49%, 0.63%, respectively, which showed good agreement. The comparison of the experimental and standard data and combined uncertainties of the experimental data confirmed good reliability of the experimental method and apparatus. The four ternary solutions with ILs as additives have lower vapour pressure compared to the corresponding binary solutions without ILs. The results showed that the four ternary solutions of HCOOK + [Emim]Ac / [Emim]Br / [Emim]Cl / [Emim]NO 3 + H 2 O can be the alternatives for traditional dehumidification and absorption media. [Emim]Cl has the best ability to reduce the vapour pressure of HCOOK + H 2 O at the solute (HCOOK + IL) mass fraction of 0.4 and 0.5. The [Emim]Ac has the most effect reducing the vapour pressure of HCOOK + H 2 O at the solute (HCOOK + IL) mass fraction of 0.3.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Zhan-Ping Qiao,Tian Yang,Shu-Zhi Cao,Yu-Feng Tang,Qi-Chao Yang
Solid-liquid equilibria in the ternary systems RbX + CdX 2 + H 2 O (X = Cl, Br) at T = 298.15 K and under 101.3 kPa were investigated by the method of isothermal solution saturation, and the corresponding phase diagrams were constructed. It was found that there were five crystallization regions corresponding to CdCl 2 ·2.5H 2 O, RbCd 2 Cl 5 ·H 2 O, RbCdCl 3 , Rb 4 CdCl 6 and RbCl in the system (RbCl + CdCl 2 + H 2 O). Four crystallization regions corresponding to CdBr 2 ·4H 2 O, RbCdBr 3 , Rb 4 CdBr 6 and RbBr were found in the system (RbBr + CdBr 2 + H 2 O). The new solid compounds RbCdCl 3 , RbCdBr 3 and Rb 4 CdBr 6 were congruently soluble in water, and new double salts RbCd 2 Cl 5 ·H 2 O and Rb 4 CdCl 6 were incongruently soluble in water. The new solid-phase compounds RbCd 2 Cl 5 ·H 2 O, RbCdCl 3 , Rb 4 CdCl 6 , RbCdBr 3 and Rb 4 CdBr 6 were characterized by chemical analysis, XRD and TG-DTG techniques. The standard molar enthalpies of solution of RbCd 2 Cl 5 ·H 2 O, RbCdCl 3 , Rb 4 CdCl 6 , RbCdBr 3 and Rb 4 CdBr 6 in water were measured to be (20.74 ± 0.16) kJ·mol −1 , (28.00 ± 0.39) kJ·mol −1 , (96.56 ± 0.50) kJ·mol −1 , (35.38 ± 0.33) kJ·mol −1 and (110.64 ± 0.62) kJ·mol −1 by microcalorimetry in the condition of infinite dilution, and their standard molar enthalpies of formation were determined to be −(1545.3 ± 0.6) kJ·mol −1 , −(856.5 ± 0.7) kJ·mol −1 , −(2180.1 ± 1.3) kJ·mol −1 , −(727.1 ± 0.7) kJ·mol −1 and −(1920.5 ± 1.3) kJ·mol −1 , respectively.
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JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Tianrui Xu,Guanghui Wang,Zehua Liu,Nansheng Deng,Xuewen Zhang
A green, efficient and recyclable magnetic BiFeO 3 /Cl-g-C 3 N 4 photocatalyst was prepared for the simultaneous removal of Cr(Ⅵ) and tetracycline (TC) from water by wet chemical and thermal synthesis methods. Experimental results revealed that BiFeO 3 /Cl-g-C 3 N 4 achieved a removal efficiency of 96.1 % for Cr(Ⅵ) and 98.2 % for TC under visible light irradiation for 50 min at pH 6. The results of the work function, charge density difference, UV–vis DRS, PL, PC and EIS tests indicate the formation of S-scheme heterojunctions between BiFeO 3 and Cl-g-C 3 N 4 , which exhibits superior carrier separation and migration efficiency. The evidence for interfacial charge transfer from BiFeO 3 to Cl-g-C 3 N 4 within BiFeO 3 /Cl-g-C 3 N 4 was further corroborated by means of ISIXPS, EPR and KPFM. Moreover, calculations of the density of states demonstrate that the introduction of Cl enhances the reduction capability of BiFeO 3 /Cl-g-C 3 N 4 . Results from ESR tests and trapping experiments has demonstrated that the singlet oxygen ( 1 O 2 ) and electrons are the primary active species. Furthermore, the high removal rates of TC and Cr(VI) from industrial wastewater and groundwater, coupled with the lower ecotoxicity of TC degradation intermediates, indicate that BiFeO 3 /Cl-g-C 3 N 4 has the potential for practical applications. After five cycles, the BiFeO 3 /Cl-g-C 3 N 4 still removed 90.5 % of TC and 96 % of Cr(Ⅵ).
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