JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Qiongqiong Luo,Shaoheng Wang,Dehua Cai,Ning Zhang,Dewen Zeng
A ZnSO4 electrolyte solution with impurity salts such as MnSO4 and MgSO4 is often used in zinc hydrometallurgical processes over a wide temperature range. CaSO4·2H2O(s) scaling and fluorine corrosion are two encountered problems in the process. Understanding the CaF2(s) solubility behavior in MSO4 (M = Zn, Mn, Mg) aqueous solutions at various temperatures helps remove Ca2+ and F– ions from the solution. However, CaF2(s) solubility data, especially at temperatures >298 K, have not been published yet. In this work, CaF2(s) solubilities in the CaF2–CaSO4–MSO4–H2O (M = Zn, Mn, Mg) quaternary systems and its subsystems of the CaF2–MSO4–H2O (M = Zn, Mn, Mg) at 348.15 K and the CaF2–CaSO4–MSO4–H2O (M = Zn, Mg) quaternary systems and the CaF2–MgSO4–H2O ternary system at 298.15 K are systematically measured. The results show that the CaF2(s) solubility in the MSO4 (M = Zn, Mn, Mg) aqueous solution of a certain concentration at 348.15 K is considerably higher than that at 298.15 K. At 298.15 and 348.15 K, the salting-in effect of MSO4 (M = Zn, Mn, Mg) on CaF2(s) solubility is enhanced with the order ZnSO4 < MnSO4 < MgSO4. At both temperatures, CaF2(s) solubilities in CaSO4·2H2O(s)- or CaSO4(s)-saturated MSO4 (M = Zn, Mn, Mg) aqueous solutions are generally lower than those in pure MSO4 (M = Zn, Mn, Mg) aqueous solutions. Particularly, the salting-in effect of MgSO4 on CaF2 is so strong that CaF2(s) dissolves completely and is converted to CaSO4·2H2O(s) and MgF2(s) in a concentrated MgSO4 aqueous solution. Hence, this study indicates that high temperatures and high salt concentrations increase the CaF2(s) solubility, making the removal of Ca2+ and F– ions from the system challenging. Further, the existence of impurity salts MnSO4 and MgSO4 makes it more difficult.
研究领域:
化学
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材料科学
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冶金学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 26
·11336-11341
·
IF 3.288
Dongying Shi,Chao-Jie Cui,Chun-Xiao Sun,Jun-Ping Du,Chun-Sen Liu
A new [Co21(H2O)4(OH)12]30+ unit-incorporating polyoxotungstate, Na18[Co(H2O)6]2{[Na(H2O)4]2[Na(H2O)2]2[Co(H2O)3]2[Co21(H2O)4(OH)12](SiW10O37)6}·24H2O (denoted as Co25Si6W60), has been hydrothermally synthesized and fully characterized via elemental analyses, thermogravimetric analysis, bond valence sum (BVS) calculations, IR spectrum, UV-vis spectrum, diffuse reflectance spectrum, powder X-ray diffraction and single-crystal structural analysis. The most remarkable feature is that the gigantic [Co21(H2O)4(OH)12(SiW10O37)6]30− core in Co25Si6W60 is composed of a square-like [Co21(H2O)4(OH)12]30+ nanosheet encapsulated by six dilacunary Keggin [α-SiW10O37]10− moieties in a staggered fashion, resulting in a remarkable sandwich-type assembly. Furthermore, the unique Co25Si6W60-based biosensing system, as a simple, rapid, and highly sensitive electrochemical platform, offers an environmentally friendly route for detecting dichlorvos in the field of both food safety and environmental pollution.
研究领域:
无机化学
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分析化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Plasma Processes and Polymers
·
2023
·Vol. 20
·期 5
·2200228
·
IF 3.5
Siyuan Sui,Hongmei Sun,Guohua Ni,Yafeng Liu,Huan Zheng,Tao Sun,Ling Kong,Zhongyang Ma,Fangli Yuan
The surface of polytetrafluoroethylene (PTFE) is activated by argon (Ar), Ar mixed with water vapor (Ar-H 2 O), and a mixture of Ar, water vapor, and ammonia (Ar-H 2 O-NH 3 ) plasmas and then grafted onto polymerized dopamine/ethylene imine and immobilized heparin. Oxygen-containing functional groups are all introduced onto the PTFE surface treated by three types of plasma. The amount of oxygen grafted is the highest in samples treated with Ar-H 2 O-NH 3 plasma compared to that treated with Ar-H 2 O plasma. An increase in the content of oxygen grafted onto PTFE contributes to an increase in the thickness and cross-linking bond of the polymeric interlayer and then raises the density of the heparin coating. The thickness of the polydopamine/polyethylenimide intermediate layer on the surface of PTFE treated with Ar-H 2 O-NH 3 plasma is 4.8 ± 0.3 μm, and the density of the immobilized heparin coating was 95 μg/cm 2 .
研究领域:
材料科学
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表面化学
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生物医学工程
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Jianke Tang,Rongqian Meng,Yanfeng Xue,Shengjian Zhang,Qiaoling Li
A novel Ag 3 PO 4 /WO 3 ·H 2 O composite was prepared by loading Ag 3 PO 4 on WO 3 ·H 2 O substrate via a two-step hydrothermal method and characterized by various analytical techniques. The photocatalytic performance was evaluated by the degradation of methylene blue (MB) and oxytetracycline (OTC) under visible light irradiation. Within 30 min, 98.9 % MB can be degraded by the Ag 3 PO 4 /WO 3 ·H 2 O composite with a molar ratio of 3:1 (3Ag/1W), which is higher than that of individual Ag 3 PO 4 and WO 3 ·H 2 O. The 3Ag/1W photocatalyst also exhibits improved photocatalytic activity for OTC degradation than pure WO 3 ·H 2 O and Ag 3 PO 4 . The improvement of photocatalytic activity would be mainly ascribed to the highly efficient separation of photo-induced electron-hole pairs due to matched band structure, as confirmed by photoluminescence spectra (PL) and photocurrent responses test. According to the experimental results of radical trapping and electron spin resonance (ESR), a possible photocatalytic mechanism of the Ag 3 PO 4 /WO 3 ·H 2 O composite was proposed.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Kaiyu Zhao,Kangrui Sun,Yafei Guo,Lingzong Meng,Tianlong Deng
The isopiestic equilibria for the systems {Li 2 B 4 O 5 (OH) 4 + H 2 O}, {LiB 5 O 6 (OH) 4 + H 2 O} and {Li 2 B 4 O 5 (OH) 4 + LiB 5 O 6 (OH) 4 + H 2 O} at 288.15 K and ambient pressure were measured by the isopiestic method using a modified gravimetric isopiestic apparatus. The water activities and osmotic coefficients were determined based on the sodium chloride standard reference solution. On the basis of Pitzer model, an extended Pitzer model was developed to describe the thermodynamic properties of the aqueous systems containing different forms of lithium borates, then the Pitzer single salt parameters β (0) , β (1) , β (2) and C ϕ for the binary systems {Li 2 B 4 O 5 (OH) 4 + H 2 O} and {(LiB 5 O 6 (OH) 4 + H 2 O} and mixing ion-interaction parameters θ B 4 O 5 OH 4 , B 5 O 6 OH 4 and ψ Li , B 4 O 5 OH 4 , B 5 O 6 OH 4 for the ternary system {Li 2 B 4 O 5 (OH) 4 + LiB 5 O 6 (OH) 4 + H 2 O} were fitted with the experimental osmotic coefficients using the Fortran 97 program. Meanwhile, the water activities were calculated by the Pitzer parameters, and the good agreement between the calculated water activities and experimental results of this ternary system indicated that the Pitzer parameters obtained in this work were reliable.
研究领域:
物理化学
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热力学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2024
·
IF 1.5
Luyong Zhang,Shibin Wang,Zhencheng Wu,Xueling Hou,Zhihua Yang,Fangfang Zhang,Shilie Pan
Tetrahedral oxygenated groups with large highest occupied molecular orbital-lowest unoccupied molecular orbital (H gaps such as [SO 4 ] are beneficial for deep ultraviolet (DUV) transmission but usually make against generating sufficient birefringence due to the small polarizability anisotropy. Thus, it is extremely difficult to obtain DUV transmission and large birefringence simultaneously in the search for DUV birefringent materials in sulfates. Herein, two new ammonium-rare earth metal sulfates, NH 4 Y(SO 4 ) 2 ·H 2 O and NH 4 YSO 4 F 2 , with DUV transmission are presented. Meanwhile, both exhibit greatly elevated birefringence through the involvement of NH 4 + units, compared to Y 2 (SO 4 ) 3 ·8H 2 O. Their optical properties are further investigated by theoretical calculations, and the effect of the introduction of NH 4 + into yttrium sulfate on optimizing the structures and properties is discussed. This work may provide a new perspective for further exploration of DUV birefringent materials in tetrahedral oxygenated group sulfates.
研究领域:
材料科学
·
光学
·
晶体学
✓ 已验证
DOI
高影响因子
BIOMASS & BIOENERGY
·
2022
·
IF 5.774
Linhao Sun,Xuebin Lu,Yudan Xue,Xiaotong Wang,Zhihao Yu,Xinyuan Du,Rui Zhang,Xiaoyun Li,Jian Xiong
Hydrolysis of cellulose into C 6 sugars is the starting point and entry point for biomass refining and is an important pathway for biofuel production. However, biomass-based 2,5-furandicarboxylic acid (FDCA) is a highly catalytic promising but underutilized organic carboxylic acid. In this paper, we investigated the use of easily recoverable FDCA as a catalyst for the hydrolysis of cellulose to produce C 6 sugars in a γ-valerolactone/water (GVL/H 2 O) green solvent system. FDCA has high inherent acidity (pKa = 2.76) and stability with unique solubility in aqueous solutions and many solvents. These properties allows it to meet both high temperature solubility for efficient homogeneous hydrolysis reactions and low temperature crystallization catalysts for high purity recovery. This process not only solves the problem of solid-solid mass transfer between solid acid and cellulose which limits the hydrolysis rate, but also eliminates the problem of difficult separation and recovery of liquid acid catalysts. The results showed when initial concentration of microcrystalline cellulose was 0.7 wt%（equivalent to 7 g/L）, and the initial dosage of FDCA was 2.0 wt%, the maximum yield of C 6 sugars reached 72.9% (40.1% glucose and 32.8% fructose) in GVL/H 2 O (60/40, V/V) with a reaction at 200 °C for 30 min. More importantly, FDCA can achieve 80% recovery and ＞99% spectroscopic purity recovery. This study reveals the potential of FDCA as a catalyst in the catalytic conversion of biomass, which provides a new pathway for the green and efficient conversion of biomass resources.
研究领域:
化学工程
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生物技术
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可持续化学
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生物质转化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Dandan Gao,Dongdong Li,Bin Hu,Wu Li
A temperature-dependent thermodynamic model was developed for representing the solid–aqueous equilibria in the quaternary NaCl + KCl + RbCl + H2O system based on the previous ones for binary and ternary systems. The solid–liquid equilibria in the quaternary system were first predicted by the developed model and then verified by conducting the experiments at T = 298.15 K by an isothermal equilibrium method with equilibration times of 5 and 160 days, respectively. The predicted univariant curve saturated with NaCl(cr) and (K,Rb)Cl(ss) in the system is in good agreement with our experimental data. Moreover, to verify the reliability of the model for the prediction of solid solution composition that coexisted with NaCl(cr), the XRD quantitative analysis technique based on the inverse Vegard approach is used. The experimentally determined solid solution compositions well support the results predicted by the model, indicating that the model can simultaneously predict the compositions of aqueous solution and solid solution that coexisted with a pure salt, i.e., NaCl(cr), in a system under an equilibrium state. Finally, phase diagrams of the quaternary NaCl + KCl + RbCl + H2O system at a temperature range of 273.15–373.15 K were predicted. These diagrams are useful for the future industrial applications.
研究领域:
物理化学
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热力学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Xiaohui Song,Jinqiu Ma,Lingzong Meng,Tianlong Deng,Yafei Guo,Yong Ma,Dan Li
The solubilities, refractive indices, and pH values in the NaCl–Na2SO4–NaHCO3–H2O system at 323.15 K were determined by the isothermal solubility method. The dry-salt diagram of the system consists of three isothermal solubility curves saturated with two salts, one invariant point, and three crystallization regions of NaCl, Na2SO4, and NaHCO3. Two models were applied to predict the solubilities in the system based on the Pitzer model. Model I assumes that there is only one carbon species HCO3– in the solution. Model II supposes that there are three carbon species corresponding to HCO3–, CO32–, CO2(aq), and OH– in the solution. Both the computed solubilities with the two models were basically consistent with experimental results. The concentrations of HCO3–, CO32–, CO2(aq), and OH– were calculated by model II. The dominant form of carbon species is HCO3–, and the concentrations of CO32– and CO2(aq) in the sodium bicarbonate solution can be neglected. Model II can be used to describe the experimental pH values. The mean activity coefficients of NaCl, Na2SO4, and NaHCO3, osmotic coefficients, and water activities were also calculated with the Pitzer model.
研究领域:
物理化学
·
热力学
·
溶液化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xine Fan,Yanmin Zhou,Mingda Wang,Junbao Lai,Wenzhe Shan,Zhen Xing,Hao Tang,Guiping Dai,Gaixia Zhang,Long Tan
Inert atmosphere is normally necessary for fabrication of solid composite electrolytes (SCEs) as a crucial part of solid-state Li-metal batteries in order to avoid undesirable reactions induced by ambient moisture. Herein, we developed an air-processable technique to fabricate SCEs by employing LiCF3SO3 (LiOTf) as the Li salt, which was combined with Li6.4La3Zr1.4Ta0.6O12 (LLZTO) as the fast Li-conductor and polyvinylidene difluoroethylene/polyvinyl acetate (PVDF/PVAC) as the polymer matrix. With the assistance of trace H2O dissolved in electrolyte solution, the room-temperature Li+ conductivity of the obtained aSCE reached as high as 5.09 × 10–4 S cm–1, which was over 3 orders of magnitude higher than that of the one (iSCE, 1.93 × 10–7 S cm–1) cast by the electrolyte solution prepared in an inert atmosphere. The theoretical calculation results reveal that the oxygen atom of H2O exhibits a high propensity to interact with the Li atom in LiOTf (Li···O), thereby establishing a hydrogen bond with the oxygen atom (H···O) in N,N-dimethylformamide (solvent). Such interactions promoted the dissociation of LiOTf and led to the formation of uniform Li+ transportation channels. Simultaneously, the composition distribution was also altered, resulting in a smoother surface of aSCE and lowered crystallinity of PVDF. On this basis, the LiOTf/LLZTO/PVDF/PVAC solution at 60 °C was directly coated onto the surface of the LiFePO4 (LFP) cathode to fabricate the LFP-aSCE film after drying in an oven. The assembled LFP-aSCE/Li battery wetted by trace sulfolane exhibited an initial Coulombic efficiency of 94.7% and a capacity retention rate of up to 96% at 0.2 C (137 mAh g–1) after 180 cycles and a high capacity of 143.7 mAh g–1 at 0.5 C (150 cycles). Overall, this work could pave the way for the facile fabrication of solid electrolytes.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Changhao Wu,Xudong Yu,Nan Zhang,Jing Li,Qi Li,Yousheng Yang,Ke Chen,Bo Yang,Shuang Wang,Yiping Liu,Zhenwen Xing
To solve the massive accumulation of gypsum generated from polyhalite leaching and secondary gypsum, this study investigated phase equilibria of the ternary system NH 4 + , Ca 2+ // SO 4 2- - H 2 O at 323.2 K and 348.2 K. The phase diagrams included 2 invariant points, 3 univariate curves, and 3 crystallization regions corresponding to (NH 4 ) 2 SO 4 , CaSO 4 ·2H 2 O, and double salt koktaite (NH 4 ) 2 Ca(SO 4 ) 2 ·H 2 O. As temperature increased, the crystallization region of CaSO 4 ·2H 2 O contracted, whereas those of (NH 4 ) 2 SO 4 and koktaite expanded, indicating that the temperature-enhanced was beneficial to improve the crystallization efficiency of koktaite. Guided by multitemperature phase diagram, the influencing factors and optimal conditions of the comprehensive utilization process of phosphogypsum were explored. The synthesis of koktaite achieved maximum efficiency under conditions of 1: 1.5 molar ratio, 348.2 K reaction temperature, 90 min duration, and 250 rpm agitation. Concurrently, under solid-liquid ratio of 1: 0.5 and after three leaching cycles of 30 seconds each, the yield of CaSO 4 ·2H 2 O production reached 99.80% with a purity of 99.52%. However, the purity and yield of product decreased due to the accumulation of impurities during the cycles, stabilizing after 6 cycles (koktaite yield: 98.50%; purity: 95.69%; (NH 4 ) 2 SO 4 yield: 97.69%; purity: 95.42%). Granulated koktaite released NH 4 + through layer-by-layer dissolution, which prolonged the dissolution time, and the complete dissolution time was 6 times and 24 times longer than that of ungranulated koktaite and (NH 4 ) 2 SO 4 . This work integrates theoretical phase behavior analysis with process engineering to establish a circular resource recovery strategy for synthesizing high-value products from phosphogypsum.
研究领域:
物理化学
·
化学工程
·
材料科学
·
环境科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Renshan Wang,Ganhua Qiu,Yi Xiao,Xueqin Tao,Wen Peng,Benxia Li
In this work, an all-solid-state Z-scheme photocatalyst of WO 3 ·H 2 O/Pd/CdS ternary heterostructures was constructed by introducing a small amount of Pd into the optimized WO 3 ·H 2 O/CdS binary system, where Pd nanoparticles (NPs) were sandwiched between WO 3 ·H 2 O nanosheets and CdS NPs. The WO 3 ·H 2 O/Pd/CdS ternary heterostructures exhibited remarkably enhanced photocatalysis towards the oxidative coupling of benzylamines to imines, compared with the other photocatalysts of WO 3 ·H 2 O, CdS, WO 3 ·H 2 O/CdS, WO 3 ·H 2 O/Pd, and WO 3 ·H 2 O/CdS/Pd. The wavelength-dependent photocatalysis of WO 3 ·H 2 O/Pd/CdS is in good agreement with its light-harvesting intensity at the corresponding wavelengths. The photoelectrochemical results reflected the enhanced charge carrier separation in WO 3 ·H 2 O/Pd/CdS, and the photocatalytic H 2 evolution confirmed the highly efficient Z-scheme charge transfer in this ternary photocatalyst. Therefore, the WO 3 ·H 2 O/Pd/CdS ternary heterostructures possess distinct advantages of extended light harvesting region, spatial separation of electron and holes, and elevated redox power, which synergistically contribute to the superior photocatalysis. The Pd NPs sandwiched between WO 3 ·H 2 O and CdS acted as not only an electron mediator to facilitate the interfacial charge separation but also a cocatalyst to accelerate the selective oxidation of benzylamine. This work demonstrates a rational design of highly efficient Z-scheme photocatalysts and presents some revelations about the photocatalytic mechanism for selective organic transformations.
研究领域:
光催化
·
材料科学
·
化学工程
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）