JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2021
·
IF 6.064
Junhai Wang,Weipeng Zhuang,Tingting Yan,Wenfeng Liang,Ting Li,Lixiu Zhang,Xiaoyi Wei
Herein, copper perrhenate (Cu(ReO 4 ) 2 ) was synthesized using a micro-emulsion method and adhered to graphene (Gr) using an ultrasonic process. Then, the as-prepared Cu(ReO 4 ) 2 /Gr composite was added into the synthetic oil as a lubricant additive with the help of ionic liquid to achieve enhanced dispersion stability within the base oil. The tribological performances of the Cu(ReO 4 ) 2 /Gr additive were investigated using four-ball tests and the ball-on-disk reciprocating configuration under various temperatures. The potential lubrication mechanisms of the Cu(ReO 4 ) 2 /Gr additive were performed using a series of characterization methods including XRD, Raman, SEM-EDS, TEM, DSC/TG, and XPS. The results of four-ball tests at room temperature indicated that the Cu(ReO 4 ) 2 /Gr additive could substantially improve the tribological performances of the base oil. The smallest coefficient of friction (COF) and wear scar diameter (WSD) values were 0.068 and 495 μm, respectively, when 0.05 wt% of Cu(ReO 4 ) 2 /Gr was added. Additionally, the graphene accelerated friction-induced heat transfer, which led to decreased friction and wear. The results of reciprocating friction experiments at elevated temperatures revealed that the Cu(ReO 4 ) 2 /Gr additive had excellent friction-reduction properties when the temperature was high. This could be attributed to the generation of a protective layer containing tribo-oxides from the alloy, some residual carbides and copper perrhenate induced by friction heat and stress. This protective layer was uniformly and stably covered on the worn surface, which could effectively alleviate direct contact between the rubbing pair.
研究领域:
材料科学
·
摩擦学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Hao Deng,Zi-jie Li,Xu-cong Wang,Lin Wang,Kang Liu,Li-yong Yuan,Zhi-yuan Chang,John K. Gibson,Li-rong Zheng,Zhi-fang Chai,Wei-qun Shi
The pertechnetate anion (99TcO4–) is a long-lived radioactive species that is soluble in aqueous solution, in contrast to sparingly soluble 99TcO2. Results are reported for photocatalytic reduction and removal of perrhenate (ReO4–), a nonradioactive surrogate for 99TcO4–, using a TiO2 (P25) nanoparticle suspension in formic acid under UV–visible irradiation. Re(VII) removal up to 98% was achieved at pH = 3 under air or N2. The proposed mechanism is Re(VII)/Re(IV) reduction mediated by reducing radicals (·CO2–) from oxidation of formic acid, not direct reduction by photogenerated electrons of TiO2. Recycling results indicate that photocatalytic reduction of ReO4– exhibits excellent regeneration and high activity with >95% removal even after five cycles. 99Tc(VII) is more easily reduced than Re(VII) in the presence of NO3– with very slow redissolution of reduced 99Tc. This study presents a novel method for the removal of ReO4–/99TcO4– from aqueous solution, with potential application for deep geological disposal.
研究领域:
环境科学
·
放射化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Shu Miao,Yunqiang Zhao,Zhuoming Xie,Longfei Zeng,Yan Lin
Ductilization and suppression of annealing-induced embrittlement have become the critical premises for various structural applications of high-strength tungsten materials but have yielded few practical advances. Here, we successfully fabricated W–Re and nano-particle doped W-Re-ZrC alloys with a combination of desirable ductility and a high tensile strength above 1.3 GPa by powder metallurgy plus hot swaging. Specifically, the W–Re and W-Re-ZrC alloys exhibit total elongations of 31.6% and 16.1%, respectively, at room temperature. Upon high-temperature annealing at 1600 °C, the W-Re-ZrC alloy still retains a high total elongation of 12.9% and a high tensile strength of over 1.3 GPa, unlike the W–Re alloy, which exhibits substantial losses of ductility and strength. Microstructure analysis reveals that a large amount of low-angle grain boundaries and high-density mobile dislocations are responsible for ductilization. Meanwhile, ZrC nano-particles stabilize low-angle grain boundaries and dislocation structures at elevated temperatures, suppressing annealing-induced embrittlement in the W-Re-ZrC alloy. The present work provides a promising methodology for manufacturing bulk high-strength tungsten materials with favorable room-temperature ductility and high resistance to catastrophic failure during long-term service.
研究领域:
材料科学
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冶金工程
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产品关联
DOI
高影响因子
Biomaterials Science
·
2023
·Vol. 11
·期 16
·5540-5548
·
IF 6.6
Xiaoyi Wang,Min Ma,Liang Zhang,Xiaoran Wang,Yimou Zhang,Yang Zhao,Huilan Shi,Xuening Zhang,Fangshi Zhao,Jinbin Pan
Rhenium disulfide (ReS2) with distinct physicochemical properties has shown promising potential in disease theranostics, such as drug delivery, computed tomography (CT), radiotherapy, and photothermal therapy (PTT). However, the synthesis and post-modification of ReS2 agents for different application scenarios are time- and energy-consuming, which seriously hinders the clinical translation of ReS2. Herein, we proposed three facile excipient strategies for different theranostic applications of ReS2 just through the flexible use of commercial ReS2 powder. Three excipients, including sodium alginate (ALG), xanthan gum (XG), and ultraviolet-cured resin (UCR), were used to prepare different dosage forms of commercial ReS2 powder, like hydrogel, suspension, and capsule, respectively. These dosage forms of ReS2 with distinct characteristics showed great potential for second near-infrared window PTT against tumours, gastric spectral CT imaging, and functional evaluation of the digestive tract in vivo. In addition, these ReS2 formulations exhibited good biocompatibility both in vitro and in vivo, showing a promising prospect for clinical transformation. More importantly, the facile excipient strategies for commercial agents pave a bridge to the development and wide bioapplication of many other theranostic biomaterials.
研究领域:
生物医学工程
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材料科学
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肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 40
·1-18
·
IF 3
Wan Xu,Shengyuan Zhao,Huijuan Zhang,Fangfang Niu,Xingsheng Liu,Zhenbin Chen,Yuan Sun
With the continuous depletion of global rhenium resources, the separation and purification of rhenium (Re) from secondary resources became very important. Herein, an imprinted composite membrane with “flexible chain” thermo-responsive imprinted separation layer structure (Re-TIICM) was prepared to achieve selective separation and recovery of Re from secondary resources with complex composition. Re-TIICM's thermo-responsive imprinted separation layer occurred sol/gel phase transition by adjusting the temperature, which effectively mitigated the trade-off between selectivity and desorption. The structure and performance of Re-TIICM under optimum process conditions were tested and evaluated. The results showed that Re-TIICM exhibited a maximum adsorption capacity of 0.1036 mmol/g at 35°C, a separation degree of 4.37 (MnO 4 − as disturbing ions), and remained good adsorption capacity and selectivity after 9 adsorption/desorption cycles. When Re-TIICM was applied in secondary resources, the purity of Re increased from 35.412% to 70.208% after one adsorption/desorption cycle, showing a great potential for industrial applications.
研究领域:
材料科学
·
环境工程
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2023
·
IF 5.7
Lin Ai,Haonan Shi,Jixiang Chen
Herein, TiO 2 supported Ni–Re alloy catalysts (i.e., NiRe(x:y)/TiO 2 , x:y denotes the Ni/Re atomic ratio) were prepared and tested for in situ deoxygenation of methyl palmitate to hydrocarbons in aqueous phase using methanol as hydrogen donor. Raman spectra indicates that there is interaction between NiO and ReO 4 − species via forming Ni–O-Re(=O) 3 species in the calcined catalysts, which contributes to the formation of Ni–Re alloy and promotes the Ni dispersion during the reduction with H 2 . Particularly, the Ni–Re alloy particles with average size of ∼1.4 nm highly disperse on spherical TiO 2 particles (∼14 nm in diameter) in NiRe(3:4)/TiO 2 (the nominal Ni content of 3 wt %). XPS reveals a charge transfer from metallic Ni to Re in the Ni–Re alloy. In in situ deoxygenation of methyl palmitate, compared with Ni/TiO 2 , NiRe(x:y)/TiO 2 give remarkably higher deoxygenation activity and lower activity for the C–C bond hydrogenolysis , ascribed to the synergistic effect between Ni and Re species and the geometrical effect of Re, respectively, which are further verified by propanoic acid-TPD and TPSR. The yield of C 6 ∼C 16 liquid hydrocarbons can achieve as high as 98.0% on NiRe(3:4)/TiO 2 at 330 °C. There is no obvious sintering of Ni–Re alloy and support TiO 2 particles during the recycling of NiRe(3:4)/TiO 2 , while the carbon deposition and the leaching of Re species slightly reduce the catalyst activity.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 12
·1510
·
IF 3.9
Zhifang Su,Baolan Yu,Jianxin Feng,Maoling Zhong,Xuan Li,Jianying Shi
The molecular complexes of Re(4,4′-dcbpy)(CO)3Cl (dcbpy = dicarboxylicacid-2,2’-bipyridyl) and [Ru(dcbpy)3]2+are co-assembled into UiO-66 scaffolds as structural imperfects for CO2photocatalytic reduction (named as Re-Ru@U). The prepared catalysts are characterized by XRD, Fourier-Transform infrared (FTIR) spectra, X-ray photoelectron spectra (XPS) and N2adsorption–desorption isotherms. The intact structure of molecular complexes within the matrix are monitored by1H nuclear magnetic resonance (NMR) spectra through a totally digesting catalyst. The optical properties are studied via absorption and photoluminescence spectra, and the single-electron reduction in Re and Ru complexes is detected by electron paramagnetic resonance (EPR) spectra. An excellent photocatalytic performance is obtained with steady and sustained CO evolution and a turnover number (TON) value of 15 (11 h). The CO activity irradiating by single wavelength presents the absorption-intensity-dependent changing tendency, where the absorption intensity is superposed by Re and Ru complexes. The two radicals related to Re and Ru, respectively, are simultaneously detected in the Re-Ru@U catalyst. It is suggested that the ReC2component serves as both a photosensitizer and a catalyst, and the RuC2component works as an additional photosensitizer to supply the second electron for CO2reduction. The co-assembling of dual metals Re and Ru in the matrix promotes the electron transfer from the reductive Ru centres to one-electron-reduced Re centres and accounts for the superior activity of CO evolution. Our results demonstrate a strategy to develop the multimetallic catalysts via facile assembling into MOF scaffolds to promote photocatalytic performance.Keywords:rhenium;ruthenium;CO2reduction;electron communication
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Jun Hu,Shenghua Zhang,Rui Xiao,Xiaoxiang Jiang,Yunjun Wang,Yahui Sun,Ping Lu
Using isopropanol as an in situ hydrogen donor, catalytic transfer hydrogenolysis of lignin into monomeric phenols was studied at mild conditions. The performance of catalysts and the effects of H 2 , temperature, and time on depolymerization of acid extracted birch lignin (ABL) were extensively examined. Platinum-rhenium supported on titanium dioxide (PtRe/TiO 2 ) exhibited much higher activity on disrupting C O bonds than Pd/C, HZSM-5, Pt/TiO 2 , and Re/TiO 2 . 18.71 wt% monophenols was achieved for depolymerization of ABL over PtRe/TiO 2 at 240 °C for 12 h with He. 4-Propylsyringol had the highest yield of 7.48 wt%. 2D HSQC NMR analysis reveals that β-O-4 bonds have been fully disrupted during depolymerization. Addition of H 2 led to less monophenols, likely due to the competitive adsorption of active sites on catalysts. Structure-reactivity analysis based on six representative lignins shows that the total yields of monophenols were highly linearly correlated with the β-O-4 contents (R 2 = 0.97).
研究领域:
化学工程
·
可再生资源利用
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chenfan Xie,Guan Wang,Jin Gao,Han Yin,Liujun Yang,Hua Li,Jianmei Lu
The sluggish transfer of photogenerated electron-hole pairs and the high rate of carrier recombination are primary factors contributing to the suboptimal catalytic efficiency observed in organic-based photocatalysts. In this work, on the purpose of improving the photocatalytic ability of pure perylene-based micelle, rhenium bipyridine complex was introduced and the rhenium-perylene-based micelle was constructed consequently. The obtained micelle, which can achieve thorough degradation of the pollutants in the whole system within 30 min, exhibits efficient synergistic adsorption and catalysis for bisphenol A (BPA) degradation. The introduction of the metal complex exposes more active sites in the micelle. Besides, under the dual effects of photoinduced electron transfer (PIET) and metal–ligand charge transfer (MLCT), the transfer efficiency and lifetime of carriers are respectively enhanced and prolonged, which enormously increases the photocatalytic capacity of the micelle. This work will provide an insight into boosting photocatalytic properties of organic micelle materials via introducing metal active sites.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Ting Wang,Tianwei Qian,Dongye Zhao,Xiaona Liu,Qingwei Ding
Radioactive pertechnetate (TcO4 − ) has been detected in nuclear waste affected soil and groundwater, posing significant effect on human health and the environment. Yet, cost-effective remediation of Tc-contaminated soil and groundwater remains challenging. To address this critical technology need, we prepared a class of pyrite (FeS 2 ) particles for effective immobilization of pertechnetate. Using perrhenate (ReO 4 − ) as a non-radioactive surrogate of TcO 4 − , we tested the immobilization effectiveness of the material through batch kinetic experiments, and evaluated the remobilization potential of immobilized Re under anoxic (sealed from air) and oxic (exposed to air) conditions and in the presence of humic acid (HA), EDTA, nitrate, and a Chinese loess soil. The results showed that more acidic pH gave faster Re(VII) removal due to more abundant electron sources (Fe 2+ and S 2 2− ). X-ray diffraction (XRD) and/or X-ray photoelectron spectroscopy (XPS) analyses confirmed formation of ReO 2 /ReS 2 as the major reduction products. The immobilized Re remained highly stable when aged for 360 days under anoxic conditions at different influence factors. Yet, the immobilized Re was vulnerable to oxygen oxidation, and about 78% of Re was remobilized after 40 days of exposure to air regardless of the initial pH (3.5–9.0) due to excessive pyrite oxidation and the associated pH drop (~2). HA at 120 mg/L inhibited Re remobilization under oxic conditions, which lowered the Re remobilization by ~21% after 40 days of oxic aging. The presence of EDTA facilitated dissolution of Fe but inhibited the dissolution of Re under oxic conditions. Nitrate showed negligible effect on Re remobilization. The presence of a Chinese loess soil effectively inhibited Re remobilization under both oxic and anoxic conditions, lowering the leachable Re by ~32% under oxic conditions. The findings may guide engineered application of pyrite particles as a long-lasting reducing material for immobilization pertechnetate or similar redox-active contaminants in soil and water.
研究领域:
环境科学
·
放射性废物处理
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Jingjie Luo,Enhui Qu,Yixue Zhou,Yanan Dong,Changhai Liang
Rhenium , although viewed as one of the noble metals with lower-price, has been commonly used as doping element in the bimetallic catalysts due to its middlebrow to activate hydrogen. Its major role as catalyst is less frequently mentioned. In this work, rhenium has been decorated on the surface of activated carbon and used for the selective hydrogenation of dimethyl 1, 4-cyclohexanedicarboxylate (DMCD) to 1, 4-cyclohexanedimethanol (CHDM). Characterizations suggested that ReO x particles were anchored occupying the surface oxygenated groups on pre-functionalized carbon. Rhenium decoration modified both the textural and chemical properties of the samples. Electrons were easily transferred from Re to the neighboring C atoms as a result of the formation of fine ReO x particles. Medium strong acid sites were generated and rhenium species in the reduced states could be still maintained under appropriate rhenium dispersion. The moderate hydrogenation ability of rhenium catalyst partially restrained the excessive hydrogenation of CHDM to other by-products. Rational decoration of 5 wt% Re performed the better catalytic performance with complete conversion of diester and 66 % yield of diol. The specific rate reached 9.5 × 10 2 m m o l D M C D ∙ g R e - 1 ∙ h - 1 at 220 °C under 10 MPa H 2 .
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 12
·期 1
·602-610
·
IF 3.361
Yingxin Liu,Kai Liu,Meihua Zhang,Kaiyue Zhang,Jiao Ma,Shuwen Xiao,Zuojun Wei,Shuguang Deng
Highly active and thermally stable Cu–Re bimetallic catalysts supported on TiO2 with 2.0 wt% loading of Cu were prepared via an incipient wetness impregnation method and were applied for liquid phase selective hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) in H2. The effect of the molar ratios of Cu : Re on the physico-chemical properties and the catalytic performance of the Cu–Re/TiO2 catalysts was investigated. Moreover, the influence of various reaction parameters on the hydrogenation of LA to GVL was studied. The results showed that the Cu–Re/TiO2 catalyst with a 1 : 1 molar ratio of Cu to Re (Cu–Re(1 : 1)/TiO2) exhibited the highest performance for the reaction. Complete conversion of LA with a 100% yield of GVL was achieved in 1,4-dioxane solvent under the reaction conditions of 180 °C, 4.0 MPa H2 for 4 h, and the catalyst could be reused at least 6 times with only a slight loss of activity. Combined with the characterization results, the high performance of the catalyst was mainly attributed to the well-dispersed Cu–Re nanoparticles with a very fine average size (ca. 0.69 nm) and the co-presence of Cu–Re bimetal and ReOx on the catalyst surface.
研究领域:
催化化学
·
可再生能源
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）