APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Shengzong Lan,Liuyang Dong,Peilun Shen,Tianfu Zhang,Dianwen Liu,Zhengchang Shen
Apatite and calcite coexist in phosphate ore, resulting in a relatively low grade of phosphate ore and increasing the difficulty of phosphorus chemical production. Malic acid is considered to have potential as a flotation depressant due to its structural characteristics. The effects of malic acid on the flotation separation between apatite and calcite, as well as the differences in surface regulation, were systematically investigated through flotation experiments, zeta potential measurements, contact angle analysis, atomic force microscopy, X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. With a malic acid concentration of 1 × 10 −3 mol/L, the recovery of apatite decreased to 10.16 %, while the recovery of calcite remained stable at 87.59 %. The influence of interfering ions was eliminated by adding Na 2 SO 4 , and the separation performance of malic acid was verified using artificial mixed ores. Surface property characterization and morphology analysis indicated that malic acid adsorbed in a densely punctate manner on the apatite surface. The high adsorption density and strength hindered collector attachment to the apatite surface. However, the adsorption on the calcite surface was sparse and had minimal impact on its floatability. XPS results showed that malic acid adsorbed at the Ca 2+ ion sites of the minerals and interacted more strongly with apatite. DFT calculations demonstrated that the adsorption of malic acid on the apatite surface was more pronounced, and the presence of H atoms within malic acid molecules, together with solvent water molecules, further enhanced the adsorption reaction. This study provides a theoretical basis for the application of malic acid as a flotation depressant and offers new ideas for the efficient flotation separation of phosphate ore.
研究领域:
矿物加工
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浮选技术
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表面化学
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环境科学
·
量子化学
✓ 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
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xi Zhang,Mingzhu Huangfu,Jiushuai Deng,Yu Wang,Bozeng Wu,Mingzhen Hu,Honghui Zhao,Suozhi Wu
Specularite is generally recovered by flotation, but its floatability is relatively weak. Activation is an effective method to improve the floatability of minerals. Therefore, finding an economic and effective activator to improve the recovery of specularite is an important research direction. In this study, lead nitrate as an activator was found and confirmed to improve the floatability of specularite. Its activation mechanism was further investigated by various analytical methods. The micro-flotation tests results showed that the recovery of specularite increased from 69.57% to 92.47% at a Pb 2+ concentration of 3 × 10 -5 mol/L, an approximately 23% increase, indicating that Pb 2+ could obviously activate specularite. The SEM-EDS results illustrated that the content of Pb on the specularite surface apparently increased after specularite treatment with lead nitrate, which confirmed the adsorption of Pb species on the surface of specularite. Zeta potential results showed that the zeta potential positively shifted within the pH range from 3 to 11, which was beneficial to the occurrence of electrostatic adsorption and chemisorption between negatively charged oleate species and specularite. XPS results revealed that lead species mainly adsorbed on the O atoms of Fe-O and Fe-OH at the specularite surface, and Pb atoms became new sites to interact with sodium oleate. In addition, Pb 2+ and Pb(OH) + were the predominant components that interacted with the specularite surface and formed -O-Pb and Fe-O-Pb complexes, which considerably increased the number of reactive sites on the specularite surface. After oleate components interacted with Pb-modified specularite, a denser hydrophobic layer was generated on the surface of specularite, which intensified the floatability of specularite.
研究领域:
矿物加工
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材料科学
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化学工程
✓ 已验证
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
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腐蚀科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Chemistry
·
2018
·
IF 1.726
Dong Wang,Yujun Zhu
The bimetal catalyst Pt-Cu/SiO2 was prepared by the impregnation method. Its catalytic performance was investigated by the selective hydrogenation of cinnamaldehyde. Pt-Cu/SiO2 exhibited much higher selectivity (64.1%) to cinnamyl alcohol than Pt/SiO2 (3.7%), while they showed similar conversion of cinnamaldehyde. This enhancement was attributed to the increase in the amount of the Pt0 species on the Pt-Cu/SiO2 surface, which is derived from the interaction between Pt and Cu revealed by XRD and XPS.
研究领域:
化学工程
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催化
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材料科学
✓ 已验证
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
✓ 已验证
产品关联
DOI
PubMed
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
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化学工程
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环境科学
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无机化学
✓ 已验证
产品关联
DOI
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
✓ 已验证
产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2022
·Vol. 14
·期 4
·5295-5304
·
IF 4.05
Tong Dongshen,Chen Xingtao,Dong Yuxiao,Fang Zhi,Zhang Hao,Zhou Chunhui,Yu Weihua
Kaolinite is a layered silicate material with a Janus character and has been directly used as the solid catalyst for the hydrolysis of cellulose in our previous work. Reducing sugar (RS) is one of the most important intermediates for the utilization of cellulose. In the present study, metal ions dispersed on kaolinite was easily prepared and further evaluated for the hydrolysis of cellulose to RS in water. The metal ions dispersed kaolinite was characterized by XRD, BET, SEM(EDS), and XPS. The catalytic results showed that copper was the best co-catalyst among the tested metal ions and the kaolinite treated with 4(wt)% copper nitrate by calcination at 623 K showed the highest total reducing sugar (TRS) yield of 51% under 478 K with the mass ratio of catalyst to cellulose of 0.2 and weight ratio of water to cellulose of 7 for 3 h. Moreover, the catalyst could be easily regenerated by calcination and the yield of TRS on the regenerated catalyst decreased from 51 to 43.2% after four times reuse. The characterization results revealed that copper was highly dispersed on the outer SiO 4 tetrahedral layer. The surface cuprous species were the active sites and could make the C-O bond cleavage easily by attacking the positively charged carbon atoms of the β-(1,4)-glycosidic linkage in the cellulose. The leaching of the cuprous species was responsible for the deactivation of the catalyst. The copper dispersed kaolinite is the efficient catalyst for the hydrolysis cellulose to reducing sugars and worth further development. Graphical abstract
研究领域:
催化
·
材料科学
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环境化学
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绿色化学
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高分子科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zhongqi Wei,Qin Zhang,Xuming Wang
The effective separation of apatite and dolomite is always the focus of phosphate ore flotation research . The effect of citric acid (CA) on the flotation reaction of apatite and dolomite was studied. The flotation behavior of these two minerals was evaluated through micro-flotation experiment. The results of micro-flotation experiment indicate that CA has selective depression for apatite, but has no obvious depression for dolomite The depression mechanism of CA on apatite and dolomite was analyzed by infrared spectroscopy (FTIR), Zeta potential measurement and XPS analysis . CA adsorbed on apatite and dolomite to varying degrees via FTIR test and Zeta potential measurement. The results from XPS test showed that CA formed chemisorption on apatite surface to form organic complex, but not on dolomite surface. In addition, the results of adsorption amounts and mineral dissolution experiments further support the selective depression mechanism of apatite. Through adsorption amounts test and surface dissolution test, it is found that the surface of dolomite dissolves strongly, and a large amount of calcium ions are generated in the solution. Calcium ions can chelate with citric acid and consume citric acid. At the same time, the calcium density on the surface of dolomite is higher than that of apatite, and a large amount of dissolution occurs on the surface of dolomite. However, the density of remaining active sites on the surface of dolomite is still high, and sodium oleate can still be adsorbed on the surface of dolomite. The degree of surface dissolution of apatite is less. CA occupies the active sites on the surface of apatite, making it difficult for sodium oleate to adsorb on the surface of apatite, resulting in poor apatite floatability.
研究领域:
矿物加工工程
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Weifan Du,Xianbo Li
The flotation separation of dolomite and fluorapatite is difficult due to the similar surface properties. In this study, carboxymethyl cellulose (CMC) was introduced as a depressant for flotation of dolomite and fluorapatite, the adsorption mechanism of CMC on the mineral surfaces was clarified by DFT calculations, XPS analysis , zeta potential and contact angle measurements. The results showed that CMC exhibited a strong inhibitory effect for dolomite under alkaline conditions due to the surface adsorption. Compared with the adsorption of CMC on two Ca sites or two Mg sites of dolomite (104) surface, CMC preferred to simultaneously adsorb at Ca site and Mg site to form a more stable bridge adsorption, the two O in carboxyl group of CMC could bond with Ca and Mg to form chemical adsorption . However, CMC could not be adsorbed on the surface of fluorapatite, and the presence of CMC did not affect the adsorption of collector on fluorapatite surface to make it hydrophobic. Thus, CMC can be used as an alternative depressant for the selective flotation separation of dolomite and fluorapatite.
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
危险品化学品经营许可证（带存储）