RSC Advances
·
2024
·Vol. 14
·期 1
·147-153
·
IF 3.9
Hongzheng Li,Ying Li,Bo Li,Wenlong Huang,Yushi Ding
ReNiO3 (Re = Pr, Sm, Eu) solid electrolytes were prepared by the sol–gel method, which were sintered in a pure oxygen atmosphere of 20 MPa at 1000 °C for 24 hours. The DC resistivities of the three materials in air and in a hydrogen-containing atmosphere were tested respectively. The resistivities in the hydrogen-containing atmosphere were about 102, 104, and 105 times higher than those in air and XPS analysis showed that after 10%H2–Ar treatment, the proportion of Ni2+ of PrNiO3, SmNiO3 and EuNiO3 increased successively. The proton transport number of PrNiO3 was lower than 0.5 at 50–500 °C, and SmNiO3 and EuNiO3 were almost pure proton conductors below 200 °C. The conductivities of SmNiO3 and EuNiO3 were 1.08 × 10−4 S cm−1 and 1.83 × 10−5 S cm−1 at 200 °C in 5%H2–Ar. The hydrogen sensing properties of SmNiO3 and EuNiO3 show that the measurement results of the two materials were accurate in the range of 0.5–10% H2.
研究领域:
材料科学
·
固态离子学
·
能源材料
·
无机化学
·
传感器技术
✓ 已验证
DOI
高影响因子
Metals
·
2025
·Vol. 15
·期 7
·815
·
IF 2.5
Feng Jiang,Pengyuan Wang,Jiaxing Qi,Wei Sun,Yulin Zhou,Weishang Zhao,Shuai He,Yuanjia Luo,Honghu Tang
The efficient separation of antimonate minerals from quartz remains a significant challenge in mineral processing due to their similar surface properties and strong hydrophilicity. This study explored the application of sodium dodecyl sulfonate (SDS) as a selective collector for antimonate–quartz flotation separation. Micro-flotation tests demonstrated that SDS achieved optimal recovery of antimonate minerals (90.25%) at pH 8 with a dosage of 70 mg/L, while quartz recovery remained below 10%. Contact angle measurements revealed a significant increase in the hydrophobicity of antimonate minerals after SDS treatment, whereas quartz remained highly hydrophilic. FTIR and XPS analyses confirmed the selective chemisorption of SDS on antimonate mineral surfaces through Sb-O-S bond formation, while negligible adsorption occurred on quartz. Adsorption isotherms further showed the higher SDS uptake on antimonate minerals compared to quartz. These findings collectively demonstrate the effectiveness of SDS as a selective collector for the flotation of antimonate minerals, providing a promising approach to enhancing the recovery of fine antimonate particles.
研究领域:
矿物加工
·
表面化学
·
浮选化学
·
资源回收
·
胶体与界面科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Haiyan Yang,Yang Zhou,Dongshen Tong,Miao Yang,Kai Fang,Chunhui Zhou,Weihua Yu
Cellulose is the most abundant form of biomass on earth, and is considered as an alternative for fuels and chemicals. The hydrolysis of cellulose to platform compounds, such as reducing sugars (RS), is one of the most important ways for the utilization of cellulose. In this study, the solid acid catalysts of SO 4 2− -ZrO 2 /montmorillonite (SZ-Mt) were prepared by coupling SO 4 2− with ZrO 2 and then introducing into the interlayer of Mt using the coprecipitation method. Meanwhile, the catalytic performance of the SZ-Mt catalysts for the hydrolysis of cellulose to RS in water was studied. The catalysts were characterized by XRD , FT-IR, BET, SEM(EDS), NH 3 -TPD and XPS . The catalytic results showed that the SZ-Mt composite calcined at 500 °C with the molar ratio of S/Zr of 0.3 showed the highest total reducing sugars yield of 30.1%. The characterization results revealed that the surface S O bonds of sulfated zirconium oxide could gradually change from O=S-OH groups (type I, -HSO 4 ) to O=S=O groups (type II, -S 2 O 7 ). It was concluded that the surface S-OH groups in type I were responsible for the hydrolysis of cellulose in the low molar ratio of S/Zr and the new S-OH bonds formed by breaking the S-O-S bonds in type II were contributed to the conversion of cellulose in the high molar ratio of S/Zr. Finally, the mechanism of cellulose hydrolysis on the SZ composites was suggested.
研究领域:
化学工程
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 10
·2255
·
IF 4.2
Yan Cui,Zequan Zeng,Yaqin Hou,Shuang Ma,Wenzhong Shen,Zhanggen Huang
Noble metals have become a research hotspot for the oxidation of light alkanes due to their low ignition temperature and easy activation of C-H; however, sintering and a high price limit their industrial applications. The preparation of effective and low-noble-metal catalysts still presents profound challenges. Herein, we describe how a Ru@CoMn2O4spinel catalyst was synthesized via Ru in situ doping to promote the activity of propane oxidation. Ru@CoMn2O4exhibited much higher catalytic activity than CoMn2O4, achieving 90% propane conversion at 217 °C. H2-TPR, O2-TPD, and XPS were used to evaluate the catalyst adsorption/lattice oxygen activity and the adsorption and catalytic oxidation capacity of propane. It could be concluded that Ru promoted synergistic interactions between cobalt and manganese, leading to electron transfer from the highly electronegative Ru to Co2+and Mn3+. Compared with CoMn2O4, 0.1% Ru@CoMn2O4, with a higher quantity of lattice oxygen and oxygen mobility, possessed a stronger capability of reducibility, which was the main reason for the significant increase in the activity of Ru@CoMn2O4. In addition, intermediates of the reaction between adsorbed propane and lattice oxygen on the catalyst were monitored by in situ DRIFTS. This work highlights a new strategy for the design of a low-noble-metal catalyst for the efficient oxidation of propane.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY
·
2018
·
IF 4.374
Huajun Chen,Wenjie Tian,Wuxiu Ding
Metallic sliver-doped mesoporous Al 2 O 3 fibers (meso-Ag/Al 2 O 3 ) that can harvest visible light to speed up solar water purification, were synthesized by one-pot hydrothermal method. Insightful analyses of XRD, XRF and XPS of meso-Ag/ Al 2 O 3 verified that metallic silver occupied interstitial positions of Al 2 O 3 lattice forming interstitial solid solution. N 2 adsorption/desorption illustrated that meso-Ag/Al 2 O 3 exhibited significantly increases in the specific surface area, pore volume and average pore diameter after doping with silver. The UV–Vis diffuse reflectance spectra and disinfection performance indicated that meso-Ag/Al 2 O 3 can harvest visible light to promote the conversion of dioxygen to ROS for water disinfection compared with the widely used TiO 2 . With our approach, we achieved water disinfection of >99.999% inactivation of bacteria in 120 min with a small amount of material (8 mg/L) under simulated visible light.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 16
·23822-23838
·
IF 0
Yu Heng,Zhang Hongliang,Zhang Chenyang,Sun Wei,Han Mingjun,Wang Rong,Wei Xin,Li Songjiang
The rapid development of industrial society is also accompanied by the generation of a large amount of heavy metal wastewater, which has caused serious harm to the ecological environment and human society. Natural sphalerite has an important value in the environmental field due to its own semiconducting properties. In order to effectively remove Ag + from wastewater containing silver, this study develops a natural mineral-based Ag + adsorbent material (sphalerite) based on elemental affinity qualities and mineralization principles. The results of batch experiments showed that the initial Ag + concentration of 50 mg/L reduced to 0.094 mg/L with a reaction duration of 15 min, a sphalerite dose of 5 g/L, an initial particle size of −400 mesh (38 μm), a reaction temperature of 25 °C, and a pH of 5. The highest adsorption capacity is 19.77 mg/g, and the adsorption behavior is consistent with the Freundlich isotherm model and pseudo-second-order adsorption kinetics. The results of solution chemical analysis indicate that the presence of Ag + is primarily influenced by the presence of S 2− . Further analysis using SEM-EDS, FTIR, and XPS techniques reveals that Ag + is chemically adsorb onto the mineral surface, resulting in the formation of Ag 2 S. DFT calculations further confirm the overlap between the Ag 4d orbitals and the S 3p orbitals on the surface of sphalerite, further confirming its chemical adsorption. Mulliken populations suggest that charge transfer occurs between Ag + and S atoms in the sphalerite surface. This research systematically reveals the Ag + adsorption mechanism on sphalerite surface and expands research ideas for treating heavy metal wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
·
物理化学
·
计算化学
✓ 已验证
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Junyang Shu,Jiacheng Li,Peidong He,Jinshuo Yang,Wenlong Li,Ji Wang,Xiangbiao Yin,Lifeng Chen,Yuezhou Wei
With the growing demand for europium (Eu) in advanced fields such as opto-electronics and nuclear technology, developing efficient extraction methods has become increasingly crucial. This paper focuses on the electro-extraction of europium in LiCl-KCl molten salt, employing Sn and Sn Zn electrodes. The electrochemical behavior of Eu(III) on the Sn electrode in the molten salt system was investigated through cyclic voltammetry (CV), square wave voltammetry (SWV), chronoamperometry (CP), and open circuit chronopotentiometry (OCP) techniques. The results reveal that the reduction of Eu(III) to Eu occurs Eu(III) + e − → Eu(II) and Eu(II) + 2e − + mSn → EuSn m . Furthermore, the electrochemical behaviors of LiCl-KCl-ZnCl 2 -SnCl 2 on the W electrode revealed a peak for the Zn-Sn-Eu alloy. The exchange current density and reaction activation energy of Eu(II)/Eu were calculated on the liquid Sn and Sn Zn electrode through the polarization curve. Subsequently, constant current electrolysis was carried out using Sn and Sn Zn electrodes to extract Eu, and the extraction effect of Eu using a Zn Sn electrode is far superior to that using a Sn electrode. The extracted products were characterized via Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS) and X-Ray Diffraction (XRD), and the concentration of Eu(III) in molten salt at different times was detected by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) and the extraction efficiency under different conditions was calculated and the valence state changes of Eu during electrolysis on different electrodes were analyzed using X-ray photoelectron spectroscopy (XPS).
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2025
·
IF 4.6
Qiming Zhuo,Decheng Chen,Zenan Wang,Wei Han,Yongming Song,Wenli Liu,Peng Xi
The separation of chalcopyrite and molybdenite in porphyry copper–molybdenum ores is challenging owing to their similar floatabilities, making the use of depressants necessary. Inorganic depressants are commonly employed in the flotation industry to increase the difference in hydrophobicity between chalcopyrite and molybdenite; however, these depressants pose significant environmental risks. Recently, novel organic depressants have attracted considerable interest because of their abundance and low toxicity. This study investigated the use of 2,5-dimercapto-1,3,4-thiadiazole (DMTD), an activator recently employed in copper oxide flotation, as a depressant for the separation of chalcopyrite and molybdenite. Micro–flotation experiments demonstrated that DMTD exhibits a notable selective depression effect, significantly suppressing the flotation of chalcopyrite without adversely affecting the flotation of molybdenite. Furthermore, DMTD maintained its depression effect on chalcopyrite flotation even in the presence of xanthate. Contact angle measurements were used to analyze changes in hydrophobicity, corroborating the micro–flotation results, while SEM-EDS elemental distribution maps further confirmed the selective adsorption of DMTD on the chalcopyrite surface. XPS and AFM analyses were conducted to elucidate the microscale interaction mechanism between DMTD and chalcopyrite. The specific interaction sites on the chalcopyrite surface were identified through changes in elemental binding energies, while the evolution of surface morphology revealed how DMTD interacts with chalcopyrite in the xanthate system.
研究领域:
矿物加工
·
冶金学
·
表面化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Tao Zhou,Lingling Xie,Qing Han,Xinli Yang,Limin Zhu,Xiaoyu Cao
For cost and safety reasons, aqueous batteries are suitable for large-scale energy storage. Among all aqueous batteries, rechargeable aqueous zinc-ion batteries (ZIBs) are promising choices owing to the low equilibrium potential and high volumetric capacity of zinc. However, its development is also severely hindered by the limited available cathode materials, which generally display poor cycling capabilities. As one of the most investigated POVs (polyvanadates) today, (V 10 O 28 ) 6− has been demonstrated to be feasible in energy storage rely on the well-defined structure and fascinating material activity. Herein, we propose a polyvanadate-Na 6 V 10 O 28 with (V 10 O 28 ) 6− anion as a support structure and serve it for the first time as an aqueous ZIBs cathode. The high stability of the (V 10 O 28 ) 6− cluster permits the material to tolerate the reversible (de)insertion of Zn 2+ . As a result, the Na 6 V 10 O 28 cathode delivers a high capacity of 279.5 mAh g −1 after activation and an extraordinary lifespan over 2000 cycles. Furthermore, the pseudocapacitance analysis and GITT test reveal the pseudocapacitance behavior and high Zn 2+ diffusion coefficient (10 −10 cm 2 s −1 ) of the Na 6 V 10 O 28 /Zn cell, respectively. Not only that, ex-situ XRD, XPS, and TEM are also employed to analyze the storage mechanism of Zn 2+ , indicating the synergistic zinc-storage capacity of Na 6 V 10 O 28 and irreversible products. Overall, this work presents new insights into the application of Na 6 V 10 O 28 in aqueous ZIBs and also demonstrates the competitive potential of POVs for energy storage.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lingfeng Shen,Ning Sun,Rui Xu,Wei Sun,Li Wang
In this paper, the flotation separation of quartz and feldspar was studied with CaCl 2 as activators and mixed sodium oleate/ dodecylamine (NaOL/DDA) collectors under alkaline condition, and the action mechanism of mixed NaOL/DDA collectors on the quartz and feldspar surfaces were systematically explored. The results of micro-flotation test showed that there were 90.98% quartz and 13.08% feldspar were floated with 0.5 mmol/L CaCl 2 and 2.8 mmol/L mixed NaOL/DDA collectors with molar ratio of 8/1 at pH 10.0. And the artificial mixed minerals flotation manifested these two minerals were able to efficient separation with CaCl 2 and mixed NaOL/DDA collectors at pH 10 ∼ 11. These outcomes indicated that DDA could increase recovery of quartz obviously and reduce about a half dosage of NaOL (from 0.5 mmol/L to 0.25 mmol/L) in flotation under alkaline condition; Meanwhile, mixed NaOL/DDA collectors were able to decreased the flotation separation pH from 12 to 10 on quartz and feldspar. Infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results revealed that when NaOL collector was added alone, it could adsorb on activated quartz surface but hardly detected on feldspar surface at pH 10. However, they all were found on both quartz and felspar surface when mixed NaOL/DDA collectors were introduced as collectors. Quartz microcrystal balance with dissipation (QCM-D) experiment confirmed that mixed NaOL/DDA collectors showed a higher adsorption mass and more stable adsorption layer on quartz compared with NaOL was introduced as collector alone. In addition, whether CaCl 2 , NaOL or mixed NaOL/DDA, the adsorption mass on quartz sensor were larger than that on feldspar senor, which might cause difference of hydrophobicity on the surface of quartz and feldspar in flotation. The above experiments showed that the mixed NaOL/DDA collectors can significantly improve hydrophobic difference between quartz and feldspar after activating with CaCl 2 and expand the floated pH range of quartz compared with using NaOL as collector alone, which were efficient reagents to separate quartz and feldspar in flotation.
研究领域:
矿物加工
·
表面化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hongli Yang,Huilin Hou,Man Yang,Zhongli Zhu,Hui Fu,Dongdong Zhang,Yong Luo,Weiyou Yang
The selective photoreduction of CO 2 into hydrocarbon fuels, such as CH 4 , is highly desirable for sustainable energy but remains a significant challenge due to slow proton-electron transfer processes and competing intermediates. Herein, a novel NiO/MgAl-LDH (NMA-x, LDH represents layered double hydroxide) step-scheme (S-scheme) heterojunction has been engineered via in-situ anchoring MgAl-LDH nanoplates on metal–organic frameworks (MOFs) derived NiO microrods, which improves the CO 2 adsorption capability and specific surface area of NiO. The steered internal electric field in the p-n heterointerface promotes charge separation and attracts a high electron density center on the catalyst surface to favor CH 4 production. Meanwhile, S-scheme photogenerated charge transfer mechanism is proposed by in-situ X-ray photoelectron spectroscopy (XPS), in-situ diffuse reflectance infrared Fourier transform (DRIFT) spectra and density functional theory (DFT) calculation. In this process, photogenerated electrons are transferred from the conduction band (CB) of MgAl-LDH to the valence band (VB) of NiO, facilitating the CHO* species serve as the critical intermediate for producing CH 4 through desired photocatalytic CO 2 reduction. Using pure water as a proton source, the NMA-2 catalyst achieved a high CH 4 selectivity of 91.2% and a yield of 8.98 μmol∙g −1 ∙h −1 , representing significant potential for practical applications. This catalyst outperformed pristine and revitalized NiO by 4.23 and 2.07 times, respectively.
研究领域:
材料科学
·
催化
·
环境化学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2016
·
IF 2.632
Jianquan Tan,Weiqu Liu,Honglei Wang,Yang Sun,Shijian Wang
A novel waterborne UV-curable comb-like (meth)acrylate graft copolymer containing long fluorinated side chains (UVWCAC) was synthesized by conventional radical copolymerization of a novel mono-methacryloyloxy terminated fluorinated macromonomer (PHFBMA-GMA) and (meth)acrylate monomers. GPC, FTIR and 1 H NMR were employed to characterize the structure of the polymers. The influence of both the molecular weight and concentration of PHFBMA-GMA on the properties of UV-cured films was investigated. Hydrophobic surface could be obtained with just small amount of PHFBMA-GMA copolymerized into the polymer. The surface energy of UV-cured films decreased as both the concentration and the molecular weight of PHFBMA-GMA increased. The surface composition of the graft copolymer was characterized by XPS. XPS results confirmed the enrichment of the fluorine atoms on the surface quantitatively. In addition, the physical properties of UVWCAC UV-cured films, such as gel content, water absorption, pencil hardness, adhesion, chemical resistance, mechanical properties, optical transmittance and thermal properties were also investigated in detail. The novel UVWCAC prepared via conventional radical polymerization not only had excellent properties but also had the prominent potential application in large scale industrialization.
研究领域:
高分子化学
·
材料科学
·
表面科学
·
功能材料
·
涂层技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）