CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Si-Hai Zhang,Mei-Feng Wu,Ting-Ting Tang,Qiu-Ju Xing,Cai-Qing Peng,Fei Li,Hui Liu,Xu-Biao Luo,Jian-Ping Zou,Xiao-Bo Min,Jin-Ming Luo
In this study, nanoscale zero-valent iron (nZVI) with a considerably high surface area (182.97 m 2 ·g −1 ) and featured morphology of chain structure has been synthesized and well characterized. The as-prepared nZVI on can totally remove Cr(VI) under anoxic condition after 20 min reaction, whereas only 43% of Cr(VI) was removed after 60 min reaction under oxic condition. Noteworthily, the nZVI exhibits excellent removal capacity of Cr(VI) (123.85 mg/g) and fast removal rate (0.017 g·mg −1 ·min −1 ), much better than those reported in the literatures except for that reported by Li et al. (2008) [1] . Experimental results have confirmed that only FeCr 2 O 4 with low compactness was generated under anoxic and acidic conditions in the new process. And it is evident that the formation of the passivation layer which contains oxides and hydroxides (or (oxy)hydroxides) of iron and chromium were well hindered. Furthermore, the as-prepared nZVI has shown fast removal of traced Cr(VI) from the Cr-spiked drinking water or actual Cr-contaminated lake water. Accordingly, we proposed a new reaction process of Cr(VI) reduction by nZVI under anoxic condition. And we firstly make clear the detailed process of Cr(VI) removal by the as-prepared nZVI via X-ray photoelectron spectrometer (XPS) analysis in time scale. Meanwhile, the excellent Cr(VI) removal performance of the as-prepared nZVI could be attributed to (i) the high surface area, (ii) large quantity of active sites of nZVI, and (iii) fast electron transfer from the nZVI/FeCr 2 O 4 to Cr(VI). The present work not only provides the potential materials for the application to the rapid and high-efficient removal of Cr(VI) from aqueous solution, but also proposed a new avenue for hindering the passivation of Fe 0 . And a detailed mechanism of the Cr(VI) removal by nZVI was proposed for the first time.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Guanai Qu,Hongling Fang,Yi Li,Songwei Zhang,Litian Hu
Since the lubrication performances of ionic liquids are closely linked to their unique structures, four protic ionic liquids (PILs), [N 44 HH][DEHP], [N 444 H][DEHP], [N 448 H][DEHP] and [N 4412 H][DEHP], are designed to investigate the effect of cationic structures on the lubrication behaviors and lubrication mechanisms. Vacuum tribological tests were carried out to minimize the impact of the atmospheric environment. The structure–activity relationships and lubrication mechanisms of PILs were emphatically examined by in-situ quadrupole mass spectrometer (Q-MS) and XPS analyses. Results demonstrated that all four PILs exhibited outstanding lubrication performance under a vacuum condition. Unusually, extended alkyl chain cationic structures resulted in a changed lubrication mechanism, leading to a slight decrease in performance. In-situ Q-MS analyses and XPS further revealed that the length of the alkyl chain in cations influenced the strength of intermolecular forces in PILs, leading to changes in their lubrication performance and mechanisms.
研究领域:
材料科学
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表面工程
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化学
✓ 已验证
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Chenhu Zhang,Sun Wei,Yuehua Hu,Honghu Tang,Jiande Gao,Zhigang Yin,Qingjun Guan
Selective adsorption of tannic acid (TA) on calcite surfaces and the implications of this process for the separation of fluorite ore were studied by microflotation tests, surface adsorption experiments, zeta potential measurements, UV–vis analysis, and X-ray photoelectron spectroscopy (XPS) analysis. The microflotation tests indicated that TA, when added before sodium oleate (NaOl), could selectively depress calcite from fluorite at pH 7. Surface adsorption experiments revealed that TA hinders the interaction of NaOl with calcite. The zeta potential of calcite became more negative with TA than with NaOl. However, the characteristic features of TA adsorption were not observed on fluorite, suggesting that the dominant adsorption sites are dissimilar on the fluorite and calcite surfaces in the pulp. UV–vis spectroscopy, XPS, and solution chemistry analysis were utilized to obtain a better understanding of the mechanism for selective adsorption of TA as well as the key factors determined by the Ca 2+ and Ca(OH) + components on the mineral surfaces. A possible adsorption mechanism along with an adsorption mode is proposed for the surface interaction between TA and calcite.
研究领域:
矿物加工工程
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表面化学
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胶体与界面科学
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资源利用
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浮选化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
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2017
·Vol. 29
·期 4
·044002
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IF 3.44
Liang Huang,Chengpeng Jiao,Liqiong Wang,Zili Huang,Feng Liang,Simin Liu,Yuhua Wang,Haijun Zhang,Shaowei Zhang
ISOBAM-104 protected Rh/Ag bimetallic nanoparticles (NPs) with average diameter less than 3.0 nm were synthesized by a co-reduction method. Ultraviolet–visible spectroscopy, transmission electron microscopy (TEM), high-resolution TEM and x-ray photoelectron spectroscopy (XPS) were employed to characterize the structure, particle size, and electronic structure of the prepared bimetallic NPs. The catalytic activities of prepared bimetallic NPs for hydrogen generation from hydrolysis of a basic KBH4 solution were evaluated in detail. The results indicated that as-prepared Rh/Ag bimetallic NPs showed a higher catalytic activity than corresponding monometallic NPs. Among all the monometallic NPs and bimetallic NPs, Rh80Ag20 bimetallic NPs exhibited the highest catalytic activity with a value of 6010 mol-H2·h−1·mol-catalyst−1 at pH = 12 and 303 K. The high catalytic activities of Rh/Ag bimetallic NPs could be attributed to presence of negatively charged Rh atoms and positively charged Ag atoms, which is supported by the results of XPS and density functional theory calculation. Based on the kinetic study, the apparent activation energy for the hydrolysis reaction of the basic KBH4 solution catalyzed by Rh80Ag20 bimetallic NPs was about 47.0 ± 3.9 kJ mol−1.
研究领域:
材料科学
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催化化学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2025
·
IF 3.5
Xun Li,Xuanying Lu,Bingtao Gui,Cheng Wang,Jun Liu,Liang Lu
Seawater uranium extraction is a key technology for environmental sustainability with significant potential applications. For the first time, this work synthesized a CTAB/Bent-MOF808 with strong stability, abundant coordination functional groups, and low cost, and assessed its adsorption effectiveness for U (VI) in carbonate solutions. The study explores how pH, contact time, uranium concentration, temperature, carbonate, halide salts, phosphorus, and Ca/Mg ions influence uranium adsorption, with a focus on mechanistic insights through characterization and modeling. Under optimal conditions (temperature of 25 °C, pH 8.0, with a sodium bicarbonate concentration of 2 mmol L −1 and a U(VI) concentration of 50 mg L −1 ), which are similar to the real seawater environment, CTAB/Bent-MOF808 demonstrated superior uranium adsorption performance compared to MOF808 and CTAB/Bent in U(VI)–CO 3 solutions. Under high initial pH, NaHCO 3 , Ca/Mg ions, and halide ion concentrations, the complex's uranium adsorption capacity and removal rate are reduced due to competitive adsorption between ions, as well as increased electrostatic repulsion on the surface. The sorption process was identified as monolayer homogeneous chemical adsorption process by analyzing it with quasi second order kinetic models and Langmuir isotherm models. The inhibitory effect of halide ions is as follows: I − > F − > Br − > Cl − . XPS suggested that the complexation of bromide anion with –COOH and electrostatic attraction could be crucial processes for uranium adsorption. This study offers theoretical insights into uranium extraction from natural uranium-bearing waters and highlights the expanded potential of MOF-based adsorbents in this process, enhancing both efficiency and application scope.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2025
·
IF 3.9
Chen Zheng,Liu Peng,Cao Yu-Long,Xie Yu-Long
The manganese-based ion sieve H 1.6 Mn 1.6 O 4 shows significant advantages in lithium adsorption. Its prominent features include high adsorption capacity and low pollution characteristics of the preparation process. These combined advantages make this material important in the lithium extraction technology in salt lakes. However, problems such as high manganese dissolution loss rate, poor cyclic stability, and difficulty in powder recycling seriously restrict the industrialized application. In this paper, we propose to optimize the structure of spinel-type manganese lithium ion-sieves with a 2% Co 3+ doping strategy, which can effectively inhibit the lattice collapse triggered by Jahn–Teller aberration during the pickling cycle by replacing part of the Mn 3+ active sites with Co 3+ . After doping, the relative Mn 4+ content on the surface of the material increased from 58%–61% according to the XPS test, confirming that the introduction of Co 3+ facilitated the transition of Mn 3+ to the higher valence state Mn 4+ through the charge compensation effect. Reducing the disproportionation activity of Mn 3+ reduces the dissolution loss of Mn 2+ during the pickling process. The experimental results showed that the adsorption of doped HMCO-2 material increased from 28.8–34.9 mg/g. The adsorption capacity retention rate was 77% after five cycles, there was a high selective adsorption of Li + , and the manganese dissolving loss rate was decreased to 2.3%.
研究领域:
材料科学
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化学工程
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环境科学
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无机化学
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产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 52
·38806-38814
·
IF 3.9
Rui Zhang,Yida Zhang,Zili Li,Xiaobin Xu,Quan Xu
Boston ivy has received much attention from researchers owing to its exceptional climbing abilities. However, many aspects of their adhesion behavior remain unresolved. Our research has discovered a phenomenon of oxidation and discoloration in Boston ivy pads, which leads to a significant decrease in adhesion force. In this study, we conducted a comprehensive investigation into the oxidation discoloration phenomenon. Through XPS analysis, we confirmed that the transition from Fe2+ to Fe3+ in the pad is the primary cause of the oxidation discoloration reaction. Furthermore, by conducting in situ adhesion testing using AFM, we observed a decrease in adhesion during the oxidation of iron ions. The magnitude of adhesion is closely related to the amount of pyrocatechol. Following the oxidation reaction, iron ions chelate with more pyrocatechol, resulting in a decrease in the available pyrocatechol content for adhesion. To validate this mechanism, we designed and prepared a biomimetic composite adhesion surface of a PDMS hydrogel. This composite surface improved oxidation resistance through the hydrogel, demonstrating improved adhesion performance. These findings offer promising prospects for the application of bionic materials in various fields.
研究领域:
植物学
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材料科学
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生物力学
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产品关联
DOI
PubMed
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Songsheng Tang,Kailun Guo,Wenxiang Gao,Mingjun Wang,Chenglong Wang,Yugao Ma,G.H. Su,Suizheng Qiu,Wenxi Tian
The wetting and evaporation of sodium droplets on 304 stainless steel are closely related to the performance of high-temperature heat pipes, but related studies are scarce and imperfect. The aim of this study is to carry out an experimental study on them with a visualized experimental set-up. Firstly, the contact angle ( θ , °) of sodium droplets under different pressure ( P , Pa) and temperature ( T , °C) conditions are measured and modeled. The θ tends to decrease with increasing T and P. Among all the conditions, the largest θ is 110.75° ( P = 400 Pa, T = 200°C), and the smallest θ is 36.9° ( P = 1000 Pa, T = 400°C). By fitting the data, an experimental correlation equation between θ , T and P is derived with a R 2 of 0.92. Secondly, the evaporation patterns of sodium droplets is investigated and revealed. In general, the sodium droplets showed mixed evaporation patterns under lower pressure, while constant contact diameters patterns under higher pressure. Eventually, the chemical composition on sodium droplets is analyzed by XPS. The results show that it consists of organic matter, as well as chemical products of sodium and stainless steel that migrate to the surface of the droplet (singlet C, Na 2 O etc.). In addition, C-O organic impurities and C monomers are found precipitated near the droplet contact line. The results of the study can provide models and data for the design and performance analysis of high-temperature heat pipe, and provide valuable references for the engineering design of future high-temperature heat pipe functional materials.
研究领域:
材料科学
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热工学
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表面科学
·
化学物理
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产品关联
DOI
高影响因子
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
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能源材料
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无机化学
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传感器技术
✓ 已验证
DOI
高影响因子
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).
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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
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材料科学
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表面科学
·
功能材料
·
涂层技术
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Yehao Huang,Jia Yao,Bowen Yu,Longyu Zhang,Xiangyu Song,Weijun Peng
Chalcopyrite and molybdenite present challenges in flotation separation due to their similar floatability. In this study, ozone micro-nano bubble was employed to oxidize chalcopyrite and molybdenite, altering their surface properties to facilitate them separation via flotation. The flotation results demonstrated a significant reduction in the recovery of chalcopyrite through ozone micro-nano bubble oxidation, while molybdenite remained unaffected. The concentrates with the Mo recovery remained steady at 84 % and Cu recovery below 9 % were achieved in flotation experiments of the artificially mixed ores with various mass ratios of chalcopyrite and molybdenite. Analysis of the results from X-ray photoelectron spectroscopy (XPS), zeta potential , and contact angle measurements indicated that the surface of chalcopyrite was oxidized to form metal oxides and hydroxides after ozone micro-nano bubble oxidation, thereby decreasing its floatability. In contrast, the oxidation products of molybdenite dissolved in the pulp, preserving its original surface and floatability. Additionally, experimental results confirmed that micro-nano bubbles exhibited superior oxidation effectiveness and rate than those of conventional bubbles. In summary, ozone micro-nano bubble oxidation presented a promising green alternative to traditional depressants for the efficient separation of copper and molybdenum sulfide ore.
研究领域:
矿物加工工程
·
冶金工程
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表面化学
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资源回收
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环境友好技术
·
胶体与界面科学
✓ 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）