COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Xinyu Zhang,Liuyi Ren,Shenxu Bao,Yimin Zhang
Various studies have shown that the presence of metal ions in the slurry can significantly impact flotation . However, it was still uncertain how iron, a typical metal ion, affected rutile flotation. Micro-flotation experiments, x-ray photoelectron spectroscopy , icp-oes, solution chemistry calculation, zeta potential and contact angle test were used to explore the effect of iron ions on the surface properties and floatability of rutile in this investigation. Micro-flotation results showed that iron ions not only substantially increased the rutile flotation recovery from 42.27 % to 75.69 % at pH = 4, but also converted the optimal pH of flotation from a point (pH = 4) to a platform (pH = 4–8). Solution chemistry calculations indicated that iron ions could form complexes with hydroxyl to produce FeOH 2+ , which reacted with benzohydroxamic acid (BHA) to create [Fe(C 7 H 6 NO 2 ) 2 ] + at pH=4–7. The analysis conducted through X-ray photoelectron spectroscopy , coupled with the results obtained from contact angle measurements, revealed that the complex [Fe(C 7 H 6 NO 2 ) 2 ] + had the capability to engage with Ti-OH groups, improving the hydrophobicity of rutile surface. Zeta potential analysis results further illustrated that Fe 3+ /BHA complexes reinforce the adsorption of BHA and iron ions onto rutile surface by the formation of [Fe(C 7 H 6 NO 2 ) 2 ] + . In addition, the O1s peak fitting results and ICP-OES analysis results proved that at the same pH, 60 mg/L was the optimal concentration for iron ion activation, which may be limited by Saturated adsorption capacity of [Fe(C 7 H 6 NO 2 ) 2 ] + .
研究领域:
矿物加工工程
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材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Shuo Chen,Ting-Ting Qian,Ren Zhu,Hong Jiang
The apparent rate constant k of the photocatalytic reaction of typical aromatic pollutants, i.e., dyestuff (rhodamine B [RhB]), phenol (bisphenol A [BPA]), organic chloride (4-chlorophenol [4-CP]), drug (carbamazepine [CBZ]), antibiotics (tetracycline [TC]), and endocrine contaminants (dimethyl phthalate [DMP]), with TiO 2 at different ratios of rutile (W R ) was experimentally obtained. The modelling results between k and W R show that the optimal W R of the six pollutants were in a narrow interval of [0.347, 0.384] by LogNormal model. The two-factor interaction (2FI) and Linear model between the kinetic k value and the photocatalytic performance parameters were established. The Pareto analysis results show that Brunauer–Emmett–Teller (BET) specific surface (A) has little effect on the photocatalytic system, and the most important parameter is the interaction between Energy gap (Eg) and Photoluminescence (PL) intensity (B-C) that has a positive effect on photocatalytic reaction kinetics. The single-factor Eg (B) and PL intensity (C) have negative effects on UV photocatalytic reaction kinetics. This work can help narrow the range of the optimal W R of P25-TiO 2 for emerging organic pollutants.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
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IF 2.76
Hongqiang Li,Shunxing Mu,Xiaoqing Weng,Yunliang Zhao,Shaoxian Song
The adsorption of Pb 2+ at the rutile/water interface has been studied for the activation of rutile flotation with salicyl hydroxamic acid (SHA) as a collector in this work. This study was performed through measurement of the zeta potential, adsorption capacity, calorimetry and X-ray photoelectron spectroscopy. The experimental results showed that the adsorption of SHA on rutile and the flotability of rutile were significantly improved by the addition of Pb 2+ . This improvement was attributed to the specific adsorption of Pb 2+ in the form of PbOH + , which interacted with the Ti-OH at the rutile surface and formed a surface Ti-O-Pb + complex. This adsorption followed the Langmuir model. It reversed the zeta potential sign of rutile at pH 5.5⿿6.8 and had a heat of adsorption of ⿿46.71 kJ/mol, suggesting the occurrence of a chemiosorptive process.
研究领域:
矿物加工工程
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物理化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jinjin Gao,Chengjian Zhao,Jingfang Zhou,Chunxia Li,Yiran Shao,Chao Shi,Yingchun Zhu
Rutile titania (TiO 2 ) coatings have superior mechanical properties and excellent stability that make them preferential candidates for various applications. In order to prevent infection arising from bacteria, significant efforts have been focused on antibacterial TiO 2 coatings. In the study, titania-nanosilver (TiO 2 /Ag) coatings with five different kinds of weight percentages of silver nanoparticles (AgNPs) were prepared by plasma spray. The feedstock powders, which had a composition of rutile TiO 2 powders containing 1–10,000 ppm AgNPs, were double sintered and deposited on stainless steel substrates with optimized spraying parameters. X-Ray diffraction and scanning electron microscopy were used to analysize the phase composition and surface morphology of TiO 2 /Ag powders and coatings. Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) were employed to examine the antibacterial activity of the as-prepared coatings by bacterial counting method. The results showed that silver existed homogeneously in the TiO 2 /Ag coatings and no crystalline changed happened in the TiO 2 structure. The reduction ratios on the TiO 2 /Ag coatings with 10 ppm AgNPs were as high as 94.8% and 95.6% for E. coli and S. aureus , respectively, and the TiO 2 /Ag coatings with 100–1000 ppm AgNPs exhibited 100% bactericidal activity against E. coli and S. aureus , which indicated the TiO 2 /Ag coatings with more than 10 ppm AgNPs had strong antibacterial activity. Moreover, the main factors influencing the antibacterial properties of TiO 2 /Ag coatings were discussed with grain size and the content of silver as well as the microstructure of the coatings.
研究领域:
材料科学
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微生物学
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2026
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IF 2.9
Yanhong Gu,Xi Cheng,Rui xue Wang,Yun long Zhai,Peng cheng Gu,Weiying Zhang,yaohua hu,Xianghui Zhang,Zhenjiang Shen,Wanping Chen,Jianguo Zhao
Overall, the current research on the friction catalysis mechanism mainly focuses on two explanations: electron transfer and electron transition. However, the mechanism of electron transition has always been a speculative concept, lacking direct proof and evidence. In this study, the direct bandgap anatase and the indirect bandgap rutile were utilized for the friction catalytic degradation of rhodamine at concentrations of 100, 300, and 500 respectively. The mechanism of friction catalysis was then investigated and elucidated. TiO2 with anatase structure is indirect bandgap semiconductor. Due to this, the electrons and holes excited by friction catalysis do not easily recombine, thus exhibiting excellent friction catalytic performance. For a 500 concentration of rhodamine dye approaching the actual concentration of industrial dyes, the anatase structure TiO2 has a degradation rate of 100% after 25 h. However, for the rutile anatase structure of TiO2, since it is a direct bandgap semiconductor, the recombination of excited electrons and holes occurs, and the degradation rate of the rhodamine dye at a 500 mg/L is almost 20% after 25 h. This result provides a more favorable experimental proof and evidence for the electron transition facilitated by friction, and will undoubtedly offer theoretical and experimental references for future research on friction catalysis. This investigation will help us gain a deeper understanding of the catalytic mechanism and principles of friction-induced catalysis.
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DOI
PubMed
高影响因子
Acta Biomaterialia
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2015
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IF 6.025
Kui Cheng,Yu Sun,Hongping Wan,Xiaozhao Wang,Wenjian Weng,Jun Lin,Huiming Wang
Anatase TiO 2 nanodot films have been found to be able to release cells under light illumination with excellent efficiency and safety. In the present study, we investigated the effects of rutile contents in TiO 2 nanodot films on such light induced cell detachment behavior. The results showed that TiO 2 nanodot films with different contents of rutile phase have been prepared successfully. The content of rutile phase increased with the increase in calcination temperature. All films possessed good cell adhesion but there was a decrease in cell proliferation with the increasing content of rutile phase. Single cell detachment assay showed that the films with high rutile contents (calcined at 900 °C and 1100 °C) showed better cell detachment performance. That was ascribed to the changes of the secondary structure of extracellular proteins adsorbed on the nanodot surface after ultraviolet (365 nm, UV365) illumination. In addition, cell sheets detached through UV365 illumination maintained high activity and could be further used in tissue engineering. The present work showed that the existence of rutile phase is helpful in cell detachment behavior and it could be utilized to optimize light-induced cell detachment behavior. Statement of Significance This work discovers that the presence of rutile phase in TiO 2 nanodot films could improve the light-induced cell detachment behavior, although rutile phase is inferior to anatase phase on light induced superhydrophilicity. That strongly supported that the behaviors of adsorbed proteins are crucial in acquiring cell sheet with light illumination. In fact, the state and behavior of adsorbed protein greatly affect the interaction between biomaterials and living cells. Therefore, we consider this work is not only important in harvesting cells or cell sheets through light illumination, but also helpful in further understanding of interaction between biomaterials and cells.
研究领域:
生物材料学
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细胞生物学
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组织工程学
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产品关联
DOI
PubMed
高影响因子
Nano Research
·
2015
·Vol. 8
·期 12
·4061-4071
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IF 7.01
Zhao Zhao,Zhang Xiaoyan,Zhang Guoqiang,Liu Zhenyu,Qu Dan,Miao Xiang,Feng Pingyun,Sun Zaicheng
To further understand the effect of structural defects on the electrochemical and photocatalytic properties of TiO 2 , two synthetic approaches based on hydrothermal synthesis and post-synthetic chemical reduction to achieve oxygen defectimplantation were developed herein. These approaches led to the formation of TiO 2 nanorods with uniformly distributed defects in either the bulk or on the surface, or the combination of both, in the formed TiO 2 nanorods (NRs). Both approaches utilize unique TiN nanoparticles as the reaction precursor. Electron microscopy and Brunauer-Emmett-Teller (BET) analyses indicate that all the studied samples exhibit similar morphology and similar specific surface areas. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) data confirm the existence of oxygen defects (VO). The photocatalytic properties of TiO 2 with different types of implanted VO were evaluated based on photocatalytic H 2 production. By optimizing the concentration of VO among the TiO 2 NRs subjected to different treatments, significantly higher photocatalytic activities than that of the stoichiometric TiO 2 NRs was achieved. The incident photon-to-current efficiency (IPCE) data indicate that the enhanced photocatalytic activity arises mainly from defect-assisted charge separation, which implies that photo-generated electrons or holes can be captured by VO and suppress the charge recombination process. The results show that the defective TiO 2 obtained by combining the two approaches exhibits the greatest photocatalytic activity enhancement among all the samples.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2015
·Vol. 30
·期 6
·1179-1183
·
IF 0.399
Zhang Kuibao,Wen Guanjun,Yin Dan,Zhang Haibin
TiO 2 was employed as the waste form for disposal of simulated nuclide Sr. Preparation of Sr bearing rutile was explored under different sintering temperatures and Sr contents. The optimal treatment temperature was confirmed as 1 300 °C for the incorporation of SrO in rutile TiO 2 . Perovskite type SrTiO 3 was prepared as the resultant product. The limited containment capacity of SrO in rutile was speculated to be 56.5wt%. As the SrO content increases, the as-synthesized sample exhibits more porosity because SrTiO 3 phase demonstrates higher density than rutile and SrO. The 28 day normalized leaching rate (LRi) of Sr and Ti will decrease congruously as the SrO incorporation increases. The LR Sr value is lower than 0.1 g·m -2 ·d -1 , which is about 3 orders of magnitude higher than the LR Ti value.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Shengliang Qi,Kaixin Zhu,Ting Xu,Weiguang Ma,Xu Zong
High-entropy (HE) design provides ample opportunities for accessing catalysts with unique physiochemical properties for advanced energy and environmental applications. Although a variety of multi-cationic high-entropy materials (HEMs) have been identified, HEMs consisted of multiple cationic and anionic elements are still limited. Herein, we present the design and synthesis of a series of rutile-structured high-entropy oxyfluorides (HEOFs), including [RuO 2 ] x [MgMnZnCoF 2 ] y , [MnO 2 ] x [MgMnZnCoF 2 ] y , [MoO 2 ] x [MgMnZnCoF 2 ] y , [SnO 2 ] x [MgMnZnCoF 2 ] y and [TiO 2 ] x [MgMnZnCoF 2 ] y (x:y = 3:1, 2:1, 1:1). All the HEOFs are obtained through mechanochemical alloying rutile-structured oxide and fluoride precursors and the HEOFs inherit the crystal structures of the skeleton oxides. Moreover, the HEOFs exhibit enhanced electrocatalytic oxygen evolution reaction (OER) activity than the corresponding one-element precursors. Typically, the best-performed HEOF [RuO 2 ] 3 [MgMnZnCoF 2 ] 1 catalyst requires an overpotential of 240 mV to achieve a current density of 10 mA cm −2 , which is lower than RuO 2 (291 mV). More impressively, the specific mass activity of [RuO 2 ] 3 [MgMnZnCoF 2 ] 1 is 537.1 A g Ru −1 at 1.55 V (vs RHE), which is ca. 7.6 times that of RuO 2 (70.5 A g Ru −1 ). The enhanced electrocatalytic OER performance obtained on [RuO 2 ] 3 [MgMnZnCoF 2 ] 1 is ascribed to the contribution of the different cationic and anionic elements that modulates the electronic structures of the pristine RuO 2 , which facilitates efficient OER kinetics. This work demonstrates the efficacy of high-entropy design towards approaching excellent catalysts for enhanced electrocatalysis.
研究领域:
材料科学
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电化学
·
催化科学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Quan Zhou,Wen-Wen Wu,Yue-Chan Song,Zhuo Wang,Chao Yuan,Lu-Lu Han,Jin-Qiu Liu,Yang Yang,Peng Liu
Boron nitride nanosheets (BNNS) were mixed with rutile TiO 2 and (Al, Nb)-codoped ceramics (ANTO) powders by heteroaggregation method. Homogeneous ceramics with the single phase of rutile TiO 2 were obtained by subsequent solid-state sintering. Scanning transmission electron microscope (STEM) and X-ray photoelectron spectrometer (XPS) results show that N was doped into the crystal lattice during sintering. It is shown that the strong electron localization of the covalent N i –O bond formed between interstitial N ( N i ) and adjacent O atom shifts the cutoff frequency of high permittivity from ∼100 kHz to 100 MHz in both rutile TiO 2 and the ANTO systems. Particularly, the ANTO-0.6BNNS sample exhibits optimum dielectric properties with a permittivity of 1.3 × 10 4 and tan δ of 0.04 measured at 1 MHz. Meanwhile, the colossal permittivity of ANTO-0.6BNNS with tan δ < 0.1 shows good temperature stability in the temperature range of 200–400 K.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Changchao Jia,Tao Dong,Meng Li,Peng Wang,Ping Yang
TiO 2 hollow hierarchical architectures with anatase and rutile phases are fabricated. The hierarchical structure uniformly decorated with SnO 2 nanoparticles endows a fascinating sensing performance for detecting triethylamine (TEA). Hierarchical structure provides a close connection between anatase/rutile TiO 2 and SnO 2 , which is in favor of efficient electrons transfer . It is found that TiO 2 @SnO 2 as a novel sensing material has high response at low level of TEA and rapid responding speed in comparison with individual TiO 2 components. In the case of 5 ppm TEA gas under the operation temperature of 240 °C, the response value of TiO 2 @SnO 2 sample is up to 21.6, which is three times higher than that of TiO 2 sample. The responding speed of TiO 2 @SnO 2 sensors elevates 28% in comparison with TiO 2 . This result is utilizable for developing the high efficiency gas sensors using hollow hierarchical architecture.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Hongwen Zhang,Lei Ma,Jintao Ming,Bingqian Liu,Yibo Zhao,Yidong Hou,Zhengxin Ding,Chao Xu,Zizhong Zhang,Jinlin Long
This work demonstrated the 12 fold-enhanced solar water splitting over the type-II core-shell nanostructured TiO 2 rutile photoanodes by orienting the charge flow and accelerating the hole transport to water-oxidation sites. Such nanoheterostructured photoanodes were designed rationally and prepared by a facile strategy to enwrapping an amorphous Ta 2 O x N y layer on surface of TiO 2 nanorods grown on the FTO glass substrates, consequently the incident photon-to-current conversion efficiency was increased from 2.2% to 22.6% in a two-electrode system under 390 nm light irradiation. The activity results showed that under AM 1.5 G illumination, the photocurrent output of TiO 2 @Ta 2 O x N y photoanodes reached a stable density of 1.32 mA cm −2 at 1.23 V vs RHE, and which is 12 times and ca. 4.3 times than that of the pristine TiO 2 and TiO 2 @Ta 2 O 5 counterparts, respectively. Correspondingly, the oxygen evolution rate was improved from 20.3 to 112.7 mmol m −2 h −1 . A solar-to-chemical energy conversion efficiency of ca. 1.49% was achieved at 1.23 V vs RHE.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
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