Frontiers in Chemistry
·
2020
·
IF 3.693
Li Liqing,Yang Lin,Li Fangxu
A novel collector of 1-(2-hydroxyphenyl) dec-2-en-1-one oxime (HPDO) was synthesized from 2-hydroxy acetophenone and octanal, and its flotation and adsorption behavior for malachite were studied by flotation tests and x-ray photoelectron spectroscopy (XPS) analysis. The flotation results of a single mineral show HPDO is a special collector for malachite. Compared with benzohydroxamic acid (BHA), isobutyl xanthate (SIBX), and dodecylamine (DA), HPDO exhibits excellent flotation performance for malachite and satisfied selectivity against quartz and calcite over a wide pH range. The HPDO with a concentration of 200 mg/L can float 94% malachite at pH 8, while only recovering 7.8% quartz and 28% calcite. XPS data give clear evidence for the formation of a Cu-oxime complex on malachite surfaces after HPDO adsorption.
研究领域:
矿物加工工程
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表面化学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 59
·37246-37253
·
IF 3.361
Minli Zeng,Kunyapat Thummavichai,Wenting Chen,Guangsheng Liu,Zhen Li,Xiaorong Chen,Chen Feng,Yi Li,Nannan Wang,Yanqiu Zhu
Size-controlled Fe3O4 nanoparticles doped with rare earth (RE) ions (La3+, Ce3+, and Dy3+) varying from 15 nm to 30 nm were successful synthesized by a hydrothermal method for potential applications in the fields of biomedicine, environmental protection and magnetic memory devices. They possessed good dispersibility, adjustable particle size and nearly spherical shape. The particle grain size was uniformly distributed and showed a low degree of agglomeration in comparison with undoped Fe3O4 nanoparticles. The FTIR results showed that the RE elements partially replaced Fe2+, occupied the octahedral position, and enhanced the vibration of the Fe–O bond. The XPS study further revealed that the valence states of La, Ce, and Dy are both positive trivalent. The XPS Fe 2p valence band spectra observed a shift in the peak position toward higher binding energy after RE doping, confirming the existence of RE ions in the octahedral position. This paper explains the mechanism of rare earth doping with Fe3O4, and clarifies the influence of the doping of different RE ions on its magnetic properties. The detailed analysis of RE-doped ferrite materials can open a new perspective in designing biomedical and spintronics materials with tailored properties by choosing suitable cation substitution.
研究领域:
材料科学
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生物医学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
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
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
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
·
表面化学
·
胶体与界面科学
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资源利用
·
浮选化学
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2021
·
IF 5.134
Qingqing Hu,Donglai Ma,Yongjie Liu,Qingyun Huang,Zhixiong You,Xuewei Lv
Ferrochromium nitride is an important alloying additive for smelting nitrogen–containing steel. Preparing nitrides by using ammonia gas as reducing and nitriding agent is characterized by high–efficiency and carbon free. In this study, the reaction behavior between chromite spinel and ammonia gas was investigated. Thermodynamic analysis revealed that the reaction was feasible. The transformation of chromite spinel as well as the final products were dependent on reaction temperature, time and input fraction of ammonia gas. The experimental results proved the effect of reaction parameters on the reduction and nitridation process. Chromite spinel was reduced and nitrided to form metallic iron and CrN at temperatures below 950 °C, while metallic iron and Cr 2 N were the main products at 1000 °C. XPS analysis also proved the existence of CrN and Cr 2 N. Ferrochromium nitride with N content treater than 15 wt% was obtained when reducing above 950 °C for 3 h.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2017
·Vol. 29
·期 4
·044002
·
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
·
催化化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
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
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Congbin Xu,Chen Yang,Xiaodan Liu,Yali He,Xing Xing,Yurong Zhao,Zhi Qian,Jianzhong Zheng,Zhengping Hao
Sulfidated microscale zero-valent iron (SmZVI) attracts much attention recently in remediation of contaminated groundwater, but whether polymer coating on SmZVI would impact on its reactivity and capacity is yet to be understood. In this work, SmZVI was prepared by milling mZVI with elemental sulfur, and its stability in agar solution was evaluated. The impact of polymer coating on SmZVI grains’ capacity and reactivity for chromate reduction was then examined. Experimental results indicated that SmZVI having the best overall performance was attained by grinding mZVI with elemental sulfur at 0.05 S/Fe molar ratio for 10 h. SmZVI’s stability can be substantially improved if dispersed in 2.0 g/L agar solution. Existence of agar films on the SmZVI grain (A-SmZVI) lowered the material’s capacity for chromate reduction by 56%, and the associated reaction kinetics by 70.4%, as estimated by pseudo first-order reaction model using the early-stage experimental data. Analysis of XPS spectra of A-SmZVI post reaction with chromate indicated that multiple reductive species including Fe 0 , Fe(II), FeS, and S(-II) may have jointly participated in the redox reaction taking place on the A-SmZVI-water interface. Fitting of XPS data supported that S(-II) was oxidized to SO 4 2- , S 2 O 3 2- , and S 0 , in order of decreasing surface concentration.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Qianfei Huang,Wei Lu,Junjie Zhu,Jian Liu,Pengfei Hu,Bing Gan,Linglong Qiu
Finding effective organic corrosion inhibitors is crucial for enhancing copper's corrosion inhibition performance in corrosive environments. This study focuses on the corrosion inhibition effect of Phenyl disulphide (PDF) on copper in 3.5 wt% NaCl solution. The results show that adding 2 mM PDF to NaCl solution decreased the corrosion current density from 6 μA/cm 2 to 1.1 μA/cm 2 , with a corrosion efficiency of 81.7%. XPS analysis revealed that a protective S-Cu bonding layer was formed on the surface of copper, effectively restraining the corrosion process of copper. In addition, quantum chemistry calculations indicated that PDF was highly reactive and susceptible to electrophilic and nucleophilic attacks. The molecular dynamics simulation demonstrated that the molecule PDF adhered to the surface of Cu(111) in a parallel fashion. The binding energy was also calculated to be 235.8 kJ/mol, which effectively guarded the Cu surface and prevented contact with the Cl - containing corrosion medium.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Yanhua Xu,Xinyu Guo,Ningxuan Chen,Lei Zhang,Wenshan Zhao
To develop high efficiency organic pickling inhibitor, a new β-amino alcohol compound named 1,16-(5,12-dihydroxy-7,10-dioxa-3,14-diazahexadecane) di- p -benzenesulfonamide (TDB) was well designed and synthesized. The corrosion inhibition performances of TDB for mild steel in 0.5 M H 2 SO 4 solution were investigated by weight-loss, electrochemical impedance spectroscopy and potentiodynamic methods. It has been found that the inhibition efficiency of TDB derived from potentiodynamic method was 90.7 % at a low concentration of 10 mg/L at 25 °C. Effect of temperature indicated that the inhibition efficiency was still above 89 % even at 45 °C in the presence of 100 mg/L of TDB in 0.5 M H 2 SO 4 solution. XPS analyses showed that TDB prevented the attack of the corrosive medium by adsorbing on the surface of the mild steel. Theoretical calculations indicated that the structure of TDB is conducive to form an adsorption layer on the mild steel surface.
研究领域:
材料化学
·
腐蚀科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
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
·
化学工程
·
环境科学
·
无机化学
✓ 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）