JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Li-Rong Guo,Guo-Liang Nie,Rui-Zhi Cui,Wu Li,Yong-Ming Zhang
In addition to the common sodium salt, potassium salt, magnesium salt, and sulfate, salt lake brine is also rich in trace components in varying degrees, such as lithium, bromine, rubidium, cesium, and so forth, which is of great industrial value. These trace components are further concentrated and enriched in old brine during the process of evaporation and concentration of brine resources. In view of the coexistence characteristics of lithium, potassium, bromine, and other ions in old halide, the phase equilibria of quinary system Li+, Na+, K+/Br–, and SO42––H2O were studied by the isothermal dissolution equilibrium method at 298.15 K. The solubility data of the equilibrium liquid phase were measured, and the compositions of the solid phase as well as the crystal forms of the equilibrium solid phase were identified when the equilibrium was achieved. The corresponding 3D and dry-base phase diagrams (Na2SO4·10H2O, K2SO4, LiBr·2H2O, Li2SO4·H2O, KBr, and NaBr·2H2O saturated) were drawn based on the phase equilibrium experimental data. The research results of phase equilibria and phase diagrams reveal that the phase relations and crystallization–dissolution law of each component in solution lay a certain foundation for further research on multi-temperature phase equilibrium and thermodynamic properties of the high-component brine system and to provide basic thermodynamic data for guiding the rational development and comprehensive utilization of brine resources.
研究领域:
化学
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材料科学
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资源与环境科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Qingchan Li,Wenjing Yao,Jinhua Zhang,Zhen Li,Wenhao Wang,Jiahao Du,Jinxiang Li
Green rust (GR) is an interlayer anion-containing Fe(II)/Fe(III) mineral material that is versatile in removing a series of ionic contaminants in water. Taking SeO 4 2- (Se(VI)) as the target contaminant, this study identified that the removal processes of Se(VI) by GR could be divided into three stages: initial rapid interlayer exchange, followed by a rebound, and finally slow removal. In addition, as the percentage of SO 4 2- in GR interlayer increased, the Se(VI) removal by GR gradually decreased. To mediate the SO 4 2- -induced rebound of Se(VI), the coupling of GR with iron nanoparticles (nFe 0 @GR) was proposed in this study and it was found that the removal efficiency of Se(VI) by nFe 0 @GR was 3.53 folds greater than that of GR. This study further revealed that the enhanced reactivity of nFe 0 @GR with Se(VI) could be attributed to the re-equilibration of SO 4 2- driven by the formed GR in situ . Since it had a weaker electrostatic repulsion with interlayer SeO 4 2- than pristine GR, the Se(VI) could be quickly removed by nFe 0 @GR without the rebound. Moreover, the nFe 0 @GR was demonstrated to be effective in immobilizing Se(VI) from simulated groundwater and has a great potential to reduce the risk of Se(VI) re-release into the environment.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 3
·255
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IF 4
Changhui Zhu,Xudong Zhang,Wenling Xu,Yanni Zheng,Baohe Tian,Xi Chen,Wenchao Zhu
To overcome the limitations of conventional catalysts in sterically hindered esterification reactions, a radio frequency (RF) plasma-modifiedSO42−/S2O82−/SnO2-Al2O₃ solid superacid catalyst was synthesized via sol-gel and impregnation, followed by RF plasma treatment and calcination. Comprehensive characterization revealed that the RF plasma modification endowed the catalyst with a uniform particle distribution (4.32 nm average size), larger specific surface area (104.44 m2·g−1), elevated total acid content (142.86 μmol·g−1), and increased oxygen vacancy concentration (16.4%), compared to the conventional sol-gel–impregnation–calcination-prepared catalyst. The RF plasma-modifiedSO42−-S2O82−/SnO2-Al2O3was subsequently applied to perform the esterification reaction of Tyr, with a higher steric hindrance. Mechanistic studies indicated that the plasma-induced surface etching and electronic redistribution/intensified electron-withdrawing capability ofSO42−/S2O82−groups synergistically strengthened Brønsted/Lewis acidity. For the esterification of tyrosine—a sterically demanding substrate—the modified catalyst achieved a 92.1% methyl tyrosine yield under the optimized conditions (180 °C, 0.8 MPa N2, 6 h), where the catalyst exhibited a better mechanical strength and better lifetime with five cycles. This work not only provides a scalable plasma-assisted strategy for tuning solid superacids but also establishes an eco-friendly alternative to traditional catalysts, and was applied to the esterification reactions of some high-steric-hindrance substrates.
研究领域:
催化化学
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生物有机化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Hu Huang,Wenxin Gao,Xianbo Li
H 2 SO 4 and H 3 PO 4 are commonly used as depressants for flotation of dolomite from apatite . Unsatisfactorily, the dissociated anions such as SO 4 2- and PO 4 3- may cause trouble to the flotation . In this study, the effect of SO 4 2- , PO 4 3- on the floatability and surface adsorption of dolomite were revealed by experimental and molecular dynamics simulation studies. The results show that SO 4 2- and PO 4 3- , especially PO 4 3- , have a negative effect on flotation of dolomite. The mechanism is that the presence of SO 4 2- and PO 4 3- could inhibit the adsorption of sodium oleate collector on the dolomite surface, and decrease its adsorption capacity. In addition, SO 4 2- and PO 4 3- could react with Ca 2+ to form the hydrophilic CaSO 4 ·2H 2 O and Ca(H 2 PO 4 ) 2 , respectively, the synergistic effect resulted in a decrease in the surface hydrophobicity . As a result, the flotation of dolomite was inhibited. This study clarifies the adverse effects of dissociated anions on dolomite flotation, which also lays a foundation for the targeted removal of these ions in the next step.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 11
·2652-2662
·
IF 5.819
Jiansuxuan Chen,Xueye Wang,Yang Li,Ruobin Dai,Zhiwei Wang
The performance of nanofiltration (NF) membranes will inevitably be compromised by membrane fouling in real practice. Electro-conductive NF membranes with the assistance of an external electric field have strong prospects in membrane fouling mitigation. In this study, we developed a facile approach to synthesize a conductive thin-film composite (TFC) NF membrane. Kevlar hydrogel was first pre-coated on a stainless steel mesh (SSM) for the formation of a conductive composite support (SMM-K) through phase inversion. The hydrogel medium enabled adequate amine monomer storage and thereby a homogeneous interfacial polymerization (IP) reaction, producing a dense and continuous polyamide (PA) active layer. The synthesized SSM-K-PA NF membrane showed an ∼70% increase of water permeance compared to the NF270 membrane while maintaining an ideal SO42−/Cl− selectivity (95.3 ± 1.0% for Na2SO4 rejection and 15.5 ± 1.8% for NaCl). The attachment of the hydrogel and the deposition of the PA layer did not significantly affect the electrochemical properties of the SSM. The SSM-K-PA NF membrane acted as the cathode in an electrically-assisted NF system and showed an antifouling performance against wastewater containing bovine serum albumin (BSA) when an external electric field was applied in situ. This work paves a new way to fabricate conductive TFC NF membranes with favorable NF performance and electro-assisted fouling mitigation potential.
研究领域:
膜科学
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环境工程
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材料科学
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水处理
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhichong Wang,Kaixuan Wang,Yajuan Pan,Qing Ye,Chenxi Zhang,Dan Zhang,Yanxia Zhao,Yongliang Cheng
The incorporation of oxyanion groups offers a greater potential for enhancing the activity of oxygen evolution reaction (OER) electrocatalysts compared to traditional metal cations doping, owing to their unique configurations and high electronegativity. However, the incorporation of oxyanion groups that differ from those derived from the oxidation of anions in transition metal monoxides poses significant challenges, thereby limiting further applications of oxyanion group modification approach. Herein, we present a novel sulfate salt assistant approach to fabricate Fe-doped Ni 2 P modified with SO 4 2− /carbon (Fe-Ni 2 P-S/C) nanofibers as highly efficient OER electrocatalyst. The optimized Fe-Ni 2 P-S/C nanofibers display superb OER activity, requiring low overpotentials of 266, 323, and 357 mV at 100, 500, and 1000 mA cm −2 , respectively. Theoretical calculations reveal that the co-adsorption of PO 4 3− and SO 4 2− on the surface of reconstructed electrocatalyst can reduce the energy barrier of rate-determining step, thereby resulting in enhanced OER activity. The present study emphasizes the crucial role played by anion groups in OER activity as well as proposes a novel approach for incorporating anion groups into electrocatalysts.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2025
·
IF 2.1
Jing Li,Linglin Fu,Zongde Ma,Jinniu Chen,Changhao Wu,Nan Zhang,Xudong Yu
To understand the interrelationships within the multi-ion coexisting sulfate system during the solid–liquid transformation of polyhalite in the Bieletan area, phase equilibria of ternary systems M, Ca2+//SO42–-H2O (M = Na+, K+, Mg2+) at 288.2 K were studied by the isothermal dissolution equilibrium method. The solubility and density of the equilibrium liquid phases of the system were measured experimentally, and the composition of the equilibrium solid phase at the ternary invariant point was determined by X-ray powder diffractometry. It is found that the ternary system K+, Ca2+//SO42–-H2O at 288.2 K forms the double salt syngenite (K2SO4·CaSO4·H2O), while the systems Na+, Ca2+//SO42–-H2O and Mg2+, Ca2+//SO42–-H2O at 288.2 K only form with the formation of CaSO4·2H2O and Na2SO4·10H2O (MgSO4·7H2O). Multitemperature comparison of the M, Ca2+//SO42–-H2O (M = Na+, K+, Mg2+) systems shows that the phase diagrams of Mg2+, Ca2+//SO42–-H2O are consistent at the selected temperature, only containing CaSO4·2H2O and MgSO4·nH2O (n = 1, 6, 7). While K+, Ca2+//SO42–-H2O and Na+, Ca2+//SO42–-H2O change from 288.2 and 298.2 to 348.2 K, the phase diagram forms double salt(s) K2SO4·5CaSO4·H2O (Na2SO4·5CaSO4·3H2O and Na2SO4·CaSO4).
研究领域:
化学热力学
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无机化学
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相平衡
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地球化学
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矿物加工
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产品关联
DOI
高影响因子
Royal Society Open Science
·
2018
·Vol. 5
·期 11
·
IF 2.504
Chao Chen,Lei Cai,Xinchen Shangguan,Liang Li,Yanping Hong,Guoqiang Wu
Developing high-efficiency hetero-catalysts for transesterification reaction is of great importance in the production of biodiesel from Jatropha curcas L. seed oil (JO). Here, we synthesized a series of sulfated TiO2 by treating with varying H2SO4 concentration (SO42−/TiO2) and TiO2 catalysts and applied to the transesterification of JO. Furthermore, these heterostructures were characterized by many characterization methods including XRD, FT-IR, N2-adsorption, SEM, TEM, TG, py-IR and NH3-TPD, and their catalytic performance was investigated under various operating conditions. The results reveal that both the Brønsted and Lewis acid sites are presented in the SO42−/TiO2 catalysts, while only Lewis-type sites are observed in the TiO2 catalyst. And the acid intensity, surface area and mesoporous volume of catalysts are improved obviously after treating TiO2 with sulfuric acid. Then the SO42−/TiO2 catalysts exhibit much higher catalytic activity than TiO2 catalyst, which is attributed to the larger surface area and mesoporous volume and stronger acidity. Furthermore, the reusability behaviour of 1.5 SO42−/TiO2 catalyst in the transesterification of JO was also studied.
研究领域:
催化化学
·
可再生能源
·
纳米材料
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Yaoyao Peng,Lei Song,Siru Lu,Ziyu Su,Kui Ma,Siyang Tang,Shan Zhong,Hairong Yue,Bin Liang
The significant decrease of acid sites caused by alkali metal poisoning is the major factor in the deactivation of commercial V 2 O 5 -WO 3 /TiO 2 NH 3 -SCR catalysts. In this work, the solid superacid SO 4 2− -TiO 2 modified by sulfate radicals, was selected as the catalyst support, which showed superior potassium resistance. The physicochemical properties and K-poisoning resistance of the V 2 O 5 -WO 3 /SO 4 2− -TiO 2 (VWSTi) catalyst were carried out by XRD, BET, H 2 -TPR, NH 3 -TPD, XPS, in situ DRIFTS and TG. The results pointed out that the introduction of SO 4 2− significantly increased the NH 3 -SCR catalytic activity at high temperatures, with an exceptionally high NO x conversion over 90% between 275 °C and 500 °C. When 0.5% (mass) K 2 O was doped on the catalysts, the catalytic performance of the traditional V 2 O 5 -WO 3 /TiO 2 (VWTi) catalyst decreased significantly, while the VWSTi catalyst could still maintain a NO x conversion over 90% in the range of 300–500 °C. The characterizations suggested that the support of SO 4 2− -TiO 2 greatly increased the number of acidic sites, thereby enhancing the adsorption capacity of the reactant NH 3 . The results above demonstrated a potential approach to achieve superior potassium resistance for NH 3 -SCR catalysts using solid superacid.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xian Shi,Xinyi Xing,Mengya Ruan,Qichun Wei,Ying Guan,Hui Gao,Siquan Xu
Efficient and green catalysis of cellulose to 5-hydroxymethylfurfural (HMF) is currently a challenge that needs a breakthrough. In this study, a series of inexpensive (x)SO 4 2- /HfO 2 heterogeneous catalysts were prepared and exhibited superior catalytic performance for conversion of cellulose into HMF in the green water-tetrahydrofuran monophasic system (H 2 O-THF). An optimal HMF yield of 54% was acquired through detailed evaluation of reaction conditions. Various analyzes including ICP-OES, XRD, SEM, TEM, FTIR, N 2 adsorption–desorption isotherm, XPS, TG, NH 3 -TPD and Py-FTIR were applied to inspected the physicochemical characteristics of the (x)SO 4 2- /HfO 2 catalysts. Meanwhile, the recyclability of the catalyst and the by-products generated during the reaction process were studied and captured, respectively. The results presented herein show that the catalytic system of (30%)SO 4 2- /HfO 2 catalyst combined with H 2 O-THF monophasic solvent is advanced, and it can be both green and efficient without the presence of other additives and promoters, and has great potential in the future.
研究领域:
化学工程
·
可再生资源转化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Minghao Xu,Mei Qin,Xuerui Yang,Lei Zhou,Hui Liu
In this study, CoCuFe-LDH with SO 4 2− as interlayer anion was prepared by a pot solvothermal method, which exhibited excellent peroxymonosulfate (PMS) activation performance for the degradation of sulfamethoxazole (SMX) over a wide pH range (3.0–12.0). Under the optimal condition, the SO 4 2− -CoCuFe-LDH/PMS system resulted in 99.1 % SMX (10 ppm) degradation in 4 min. Even for 50 ppm SMX, the degradation efficiency and COD removal rate approached 93.3 % and 70.0 % within 10 min, respectively. The current catalyst showed excellent stability after 5 times recycling experiments. The high-valent metal-oxo species were the major reactive oxygen species, and the SO 4 •− , • OH, O 2 •− , and 1 O 2 were involved in the degradation of pollutant. The SO 4 2− interlayer could expand the interlayer spacing of LDH, which facilitated the diffusion of PMS and pollutants within the interlayer and improved the utilization efficiency of the active sites. The current study provided novel insights into the designation of LDH structures in advanced oxidation processes.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Shengwang Mo,Da Song,Yang Li,YuChao Zhou,Zhao-Qing Liu,Zhen Huang,Fang He
Coupling renewable energy with seawater electrolysis for green hydrogen production represents a promising approach in energy storage and conversion. Yet, conventional anodic materials suffer from chloride corrosion and active-site blockage in seawater, causing rapid deactivation at high current densities. It is thus crucial to develop electrode materials with inherent corrosion resistance and high catalytic activity that can sustain operation at ampere-level currents in harsh seawater environments. In this work, we precisely engineered a NiFe layered double hydroxide (LDH) anode functionalized with adsorbed PO43– and SO42– anions. This modified catalyst demonstrates exceptional sustainability-relevant durability, operating continuously for over 140 h at an industrially relevant current density of 1100 mA cm–2 in an alkaline flow cell, while requiring an overpotential of only 201 mV to achieve 100 mA cm–2. Compared to the unmodified sample, the catalyst demonstrates significantly enhanced activity and corrosion resistance. Further mechanistic insights into the oxygen evolution reaction (OER) were gained through in situ spectroscopy and electrochemical differential mass spectrometry (DEMS). In situ Raman spectroscopy captured the dynamic reconstruction of the electrode material, leading to the formation of a stable active phase identified as NiFeOOH/PO43–/SO42–. By combining in situ 18O-isotope-labeled DEMS with ATR-FTIR spectroscopy, the compatibility between the conventional adsorbate evolution mechanism (AEM) and the lattice oxygen mechanism (LOM) during the OER was confirmed. The synergy of these two mechanisms was shown to further enhance the OER performance. The results establish that PO43–/SO42– adsorption plays a dual role: it electrostatically repels Cl– to mitigate corrosion, while simultaneously activating lattice oxygen to promote the LOM pathway, thereby improving surface reactivity. The anion adsorption strategy presented here offers valuable guidance for designing efficient and robust anode materials for seawater electrolysis.
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DOI
高影响因子
危险品化学品经营许可证（带存储）