COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Rongdong Deng,Yi Wang,Wenting Duan,Dingquan Xing,Yuan Hu
Smithsonite is a common oxidized zinc ore , and its recovery has gained increasing attention to meet the high demand for zinc. Current methods to concentrate oxidized zinc ores are through sulfidation flotation or “sulfidation + metal + xanthate” flotation. However, such techniques are not sufficiently efficient for treating smithsonite. In this study, Pb(NO 3 ) 2 was used to pre-treat smithsonite as a crystallization inducer, and the mechanism of lead modification was studied through micro-flotation tests, adsorption measurements, contact angle measurements, X-ray diffraction (XRD), scanning electronic microscopy (SEM), and TOF-SIMS analysis. The micro-flotation test results showed that the recovery of smithsonite after Pb 2+ pre-treatment increased from 80.3% to 85.3%. The comprehensive results of adsorption experiments, contact angle measurements, XRD and SEM analysis indicated that Pb 2+ adsorbed on the smithsonite surface and transformed portion of smithsonite into cerussite, increasing the active sites on the mineral surface for adsorption of S ions . The newly formed PbS after sulfidation had an effect of induced crystallization on subsequently formed PbS, increasing PbS species and making the surface more effective for xanthate flotation. ToF-SIMS was used to visualize the 3D distribution of Pb 2+ and S 2- adsorption, and it further proved that pre-treatment with Pb(NO 3 ) 2 enhanced the sulfidation process of smithsonite.
研究领域:
矿物加工工程
·
冶金工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Bo Lv,Xuefan Feng,Xinyan Feng,Xiaoming Wang,Zhenyu Yuan,Bowen Xu,Yu Yang,Fuqin Zhang
Using photocatalysts to produce hydrogen from photocatalytic water splitting is a green approach for producing renewable energy with minimum environmental impact. The key to the success of this technology is to develop an efficient hydrogen production catalyst with stable performance. In this work, we report a simple two-step preparation of zinc carbonate modified with Cd 0.5 Zn 0.5 S/Ni(HCO 3 ) 2 composite. The participation of Ni(HCO 3 ) 2 co-catalyst improved the visible light activity, which also irreversibly inhibited the recombination of holes and electrons. Meanwhile, the novel 0D and 2D heterojunctions are responsible for the excellent catalytic performance with superior stability. The catalytic hydrogen production reached the best rate of 64 mmol/g/h with the cumulative hydrogen production of 320 mmol/g in 5 h, which is even better than that from the photocatalysts activated with the precious metal, Pt. The underlying mechanism was rationalized by the hydrogen evolution kinetics analysis. The excellent hydrogen production performance, presented in this work, demonstrated that the composite of zinc carbonate modified with Cd 0.5 Zn 0.5 S/Ni(HCO 3 ) 2 is a promising, economical and efficient choice of the photocatalyst.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Fei Xiao,Wei He,Wenlong Shao,Xinke Huo,Leyuan Rao,Weixian Wang,Xuelian Lu,Honghong Wang,Kaiyuan Li,Bihe Yuan
Developing fire protection coatings that reconcile outstanding fire safety with environmental sustainability remains a critical challenge in materials engineering. In this study, a new biomass-based intumescent coating was constructed from biomass-derived tannic acid, ammonium polyphosphate, melamine, zinc carbonate, and basalt scales. The resulting coating demonstrated excellent fire resistance performance, maintaining backside temperature of steel below 150 °C during 1200 s butane torch exposure, while the control steel with neat epoxy coating reaching structural failure threshold of 450 °C within 160 s. Cone calorimeter test indicated the rapid char formation behavior of the coating, achieving 88 % reduction in peak heat release rate, 49 % decrease in total heat release, and 83 % suppression in fire growth rate index compared to control coating. SEM-EDS, FTIR, XRD, Raman, and XPS techniques were employed to elucidate the fire protection mechanism of the coating, and it was proven that zinc carbonate and basalt scales participated in the carbonization process of the coating. The hierarchical structure combining chemical cross-linking and physical reinforcement resulted in the improvement in the integrity, cohesion, and morphology of char layer, thereby inhibiting heat and mass transfer during burning. Furthermore, the increase in surface roughness resulting from the introduction of basalt scales enhanced the hydrophobicity of the coating and allowed it to maintain strong adhesion and mechanical stability. In summary, this study not only demonstrates high fire resistance in biomass-based intumescent coatings but also offers insights for the sustainable design and functional optimization of fire protection coatings for steel structures.
研究领域:
材料工程
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消防安全工程
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高分子科学
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可持续材料
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Binghui Zhou,Xinlei Ding,Yun Chen,Hanyang Wang,Yadong Liu,Chengfei Wang,Guangmei Bai,Wenge Qiu
The activation process is a key step in preparing porous carbon. Herein, three kinds of green activators were separately used to successfully prepare N-doped porous carbons through a two-step strategy: hydrothermal carbonization and chemical activation using microcrystalline cellulose as the carbon source and urea as the nitrogen source. Palladium was deposited on these N-doped microcrystalline cellulose-based carbons (NMC-X, where X represents the activator) via a traditional deposition–precipitation method, and the resulting Pd nanoparticle catalysts (Pd/NMC-X) showed high activity in the selective hydrogenation of quinoline under mild conditions, particularly Pd/NMC-ZC (ZC, zinc carbonate), which achieved complete conversion of quinoline within 100 min at 40 °C and 4 atm H2. Characterization results suggest that the high activity of Pd/NMC-ZC is mainly attributed to the special electronic structure of its Pd species, particularly the distribution of valence states and reducibility of Pd and the high hydrogen spillover capacity between Pd and NMC-ZC. The chemical activation by ZC leads to the formation of multiple defect sites on the carbon skeleton, modifying the carbon surface properties to enhance hydrogen spillover. This also provides an excellent environment for Pd nanoparticle anchoring, thus increasing the Pd-support interactions and regulating the electronic structure of Pd.
研究领域:
材料科学
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催化
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化学工程
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环境科学
✓ 已验证
DOI
高影响因子
Acta Biomaterialia
·
2020
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IF 7.242
Jin He,Ju Fang,Pengbo Wei,Yulei Li,Hui Guo,Qingsong Mei,Fuzeng Ren
Three-dimensional (3D) porous zinc (Zn) with a moderate degradation rate is a promising candidate for biodegradable bone scaffolds. However, fabrication of such scaffolds with adequate mechanical properties remains a challenge. Moreover, the composition, crystallography and microstructure of the in vivo degradation products formed at or near the implant-bone interface are still not precisely known. Here, we have fabricated porous [email protected] scaffolds with skeletons consisting of an inner core layer of Fe and an outer shell layer of Zn using template-assisted electrodeposition technique, and systematically evaluated their porous structure, mechanical properties, degradation mechanism, antibacterial ability and in vitro and in vivo biocompatibility. In situ site-specific focused ion beam micromilling and transmission electron microscopy were used to identify the in vivo degradation products at the nanometer scale. The 3D porous [email protected] scaffolds show similar structure and comparable mechanical properties to human cancellous bone. The degradation rates can be adjusted by varying the layer thickness of Zn and Fe. The antibacterial rates reach over 95% against S. aureus and almost 100% against E. coli . A threshold of released Zn ion concentration (~ 0.3 mM) was found to determine the in vitro biocompatibility. Intense new bone formation and ingrowth were observed despite with a slight inflammatory response. The in vivo degradation products were identified to be equiaxed nanocrystalline zinc oxide with dispersed zinc carbonate. This study not only demonstrates the feasibility of porous [email protected] for biodegradable bone implants, but also provides significant insight into the degradation mechanism of porous Zn in physiological environment.
研究领域:
材料科学
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生物材料
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生物医学工程
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组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2016
·Vol. 8
·期 23
·3636-3643
·
IF 4.724
Zhenyou Gui,Wenrong Cao,Shunmugavel Saravanamurugan,Anders Riisager,Lifang Chen,Zhiwen Qi
Graphical Efficient noble alloy : Au–Pd supported on zinc hydroxycarbonate (ZOC) catalysts shows high activity for 5-hydroxymethylfurfural oxidation. The basicity of ZOC can play a crucial role in enhancing the yield of FDCA. Moreover, Au–Pd/ZOC can be recycled at least six times without significant loss of its activity. Bimetallic catalysts with Au–Pd supported on zinc hydroxycarbonate (ZOC) were synthesized by a simple deposition–precipitation method and analyzed by transmission electron microscopy to have a narrow-size distribution of predominantly 1–2 nm. The prepared Au–Pd/ZOC catalysts exhibited excellent activity towards 5-hydoxymethylfurfural (HMF) oxidation in water in the presence of the base NaHCO 3 at benign conditions of 80 °C and 3 bar O 2 , resulting in quantitative yield of 2,5-furandicarboxylic acid (FDCA). The addition of base not only enhanced the yield of FDCA but also stabilized the support ZOC by preventing ZOC from the reaction with formed carboxylic acid intermediates/products, thus allowing Au–Pd/ZOC to be recycled for at least six times without significant loss of activity. The basicity of ZOC could play an important role in obtaining the improved yield of FDCA as compared to other supports.
研究领域:
催化化学
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绿色化学
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化学工程
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材料科学
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有机合成
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环境科学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2025
·
IF 7.3
Fei Xiao,Xinke Huo,Wenlong Shao,Bihe Yuan,Kaiyuan Li,Liping Zhu
Fire protection is a critical feature in applications ranging from steel structures to battery energy storage systems. In this study, a biomass-based intumescent fire protection coating was constructed based on multi-component synergy to prevent the failure of steel structures and lithium-ion batteries (LIBs) under fire, and their thermal stability, flame retardancy, fire resistance, smoke suppression, wear resistance, and hydrophobicity of the coating were systematically evaluated. The results demonstrated that, due to the protective coating, the temperature on the backside of the steel coated with a 1.5 mm thick layer remains below 150 °C throughout the 20-minute butane torch fire test (exceeding 1100 °C), which is significantly lower than the steel structure's failure threshold. Moreover, cone calorimeter test indicated that the peak heat release rate and total heat release of the coating were significantly reduced by 89.9 % and 87.4 %, respectively, compared to the control coating. Mechanistic analysis revealed that various components in the coating reacted rapidly during combustion, enhancing the structure and composition of the intumescent char, which acted as an effective thermal barrier, inhibiting the transfer of heat and mass. In the thermal runaway experiment of LIBs, the coating inhibited heat transfer between cells, keeping the temperature on the back of the protected battery below 88.2 °C. Additionally, the surface heating rate was as low as 0.072 °C/s, which prevented or delayed the propagation of thermal runaway. In summary, this study explored the development of green, efficient, and multifunctional intumescent coatings, which may promote advancements in thermal safety protection for energy systems.
研究领域:
材料科学
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消防安全工程
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能源系统安全
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高分子化学
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热防护技术
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电化学储能
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Yun-Xiang Ma,Ya-Ping Gong,Chun-li Hu,Jiang-Gao Mao,Fang Kong
Three new d 10 transition metal selenites containing PO 4 tetrahedron, namely, Cd 7 (HPO 4 ) 2 (PO 4 ) 2 (SeO 3 ) 2 ( 1 ), Cd 6 (PO 4 ) 1.34 (SeO 3 ) 4.66 ( 2 ) and Zn 3 (HPO 4 )(SeO 3 ) 2 (H 2 O) ( 3 ), have been synthesized by hydrothermal reaction . They feature three different structural types. Compound 1 exhibits a novel 3D network composed of 3D cadmium selenite open framework with phosphate groups filled in the 1D helical tunnels. The structure of compound 2 displays a new 3D framework consisted of 2D cadmium oxide layers bridged by SeO 3 and PO 4 groups. Compound 3 is isostructural with the reported solids of Co 3 (SeO 3 ) 3-x (PO 3 OH) x (H 2 O) when x is equal to 1.0. Its structure could be viewed as a 3D zinc oxide open skeleton with SeO 3 and HPO 4 polyhedra attached on the wall of the tunnels. They represent the only examples in metal selenite phosphates in addition to the above cobalt compounds. Optical diffuse reflectance spectra revealed that these solids are insulators, which are consistent with the results of band structure computations based on DFT algorithm.
研究领域:
无机化学
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材料科学
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固体化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 36
·21991-21999
·
IF 3.361
Kaixuan Zhang,Xu Peng,Can Cheng,Yang Zhao,Xixun Yu
In order to solve the problem of aseptic loosening of artificial joints resulting from the wear particles of artificial joint components in total joint replacement (TJR), we synthesized a new kind of metalo-organic particle (Sr/Zn-doped CPP/GNS) using spark plasma sintering (SPS) as a filler to enhance the comprehensive performance of UHMWPE. Sr/Zn-doped CPP/GNS was interfused evenly with UHMWPE particles and cured in a hot press instrument to prepare Sr/Zn-doped CPP/GNS/UHMWPE composites. FTIR and SEM were carried out to characterize Sr/Zn-doped CPP/GNS particles. EDS was carried out to characterize Sr/Zn-doped CPP/GNS/UHMWPE. The micro-structure, hardness, impact strength, tribology and bio-activities of Sr/Zn-doped CPP/GNS/UHMWPE composite materials were also investigated. The results confirmed the effectiveness of this method. The hardness, impact strength, and tribology of the composites were enhanced by adding homodispersed Sr/Zn-doped CPP/GNS particles into UHMWPE. In the meantime, Sr/Zn-doped CPP/GNS/UHMWPE composites could significantly promote the growth of osteoblasts due to the bio-activity of Sr/Zn-doped CPP/GNS. Furthermore, the addition of Sr/Zn-doped CPP/GNS particle-fillers into UHMWPE could promote the secretion of OPG from osteoblasts and inhibit the secretion of RANKL from osteoblasts, and thus increase the OPG/RANKL ratio. All the results above showed that Sr/Zn-doped CPP/GNS/UHMWPE composites with appropriate Sr/Zn-doped CPP/GNS content possessed superior physicochemical performances and bio-properties, and could be considered as promising materials to treat aseptic loosening in total joint replacement.
研究领域:
生物医学工程
·
材料科学
·
骨科医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 45
·16920-16926
·
IF 4
Qiuyuan Feng,Zhixia Gao,Ketian Hou,Jialong Wang,Hong Du,Qun Jing
Two new selenites, K2Zn3Se4O12 (compound 1) and K4Zn3V4Se2O19 (compound 2), have been successfully synthesized by solid-state reactions in vacuum tubes. Compound 1 consists of a three-dimensional (3D) framework with [SeO3] triangular pyramids and [ZnO4] tetrahedra in the monoclinic space group P21/c (No. 14). Compound 1′s cut-off edge is below 344 nm, based on its UV-Vis-NIR diffuse reflectance studies, and theoretical calculations indicate a birefringence of around 0.043 at 1064 nm. The two-dimensional layer of compound 2, in contrast, is made up of [SeO3] triangular pyramids, [ZnO4] tetrahedra, and [V4O13] tetrahedra. It crystallizes in the monoclinic space group C2/c (No. 15). Its UV-Vis-NIR diffuse reflectance studies demonstrate that the compound's cut-off edge is lower than 330 nm.
研究领域:
材料科学
·
化学
✓ 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）