Temat: rutile - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Electrokinetic and flotation behavior of rutile in the presence of lead ions and aluminium ions
Autorzy:: Cheng, Hongwei
Liu, Changmiao
Guo, Zhenxu
Feng, Ansheng
Wei, Min
Lv, Zihu
Wu, Dongyin
Zhao, Dengkui
Tematy:: lead ions
aluminium ions
rutile
flotation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110558.pdf Link otwiera się w nowym oknie
Opis:: The effects of Pb(II) ions and Al(III) ions on the electro kinetic and flotation behavior of rutile were investigated by micro-flotation tests, zeta potential measurements and solution chemistry analysis. Micro-flotation results indicate that the Pb(II) ions can effectively improve the flotation recovery of rutile while the Al(III) ions significantly inhibit the flotation of rutile. Zeta potential measurements reveal that a collector styrene phosphoric acid (SPA) can adsorb on the rutile surface after the addition of Pb(II) ions, but hardly adsorb on the rutile surface after the addition of Al(III) ions. Pb(II) ions adsorb on the rutile surface in the form of Pb(OH)+ and Pb(OH)2(s), and the latter one is the main reason that activates rutile flotation. Al(III) ions adsorb on the rutile surface mainly in the form of Al(OH)3(s), which prevent the direct interaction between the rutile and the collector, resulting in a decrease of rutile flotation recovery.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Flotation separation of rutile from almandine using octadecyl amine polyoxyethylene ether as collector
Autorzy:: Li, Hongqiang
Zheng, Huifang
Chen, Qian
Kasomo, Richard M.
Leng, Jiahao
Weng, Xiaoqing
Song, Shaoxian
Xiao, Linbo
Tian, Chengtao
Tematy:: rutile
almandine
flotation separation
adsorption mechanism; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1449410.pdf Link otwiera się w nowym oknie
Opis:: In this study, the flotation separation of rutile from almandine using cationic surfactant Octadecyl amine polyoxyethylene ether (AC1815) as a new collector was investigated. The adsorption mechanism of AC1815 on rutile was illustrated through zeta potential measurement, infrared spectrum and XPS analyses. The flotation experiments demonstrated that AC1815 exhibited an excellent collecting ability and selectivity for rutile. The results of zeta potential measurements and XPS analysis indicated that more AC1815 was adsorbed on rutile surface instead of almandine. The adsorption mechanism of AC1815on rutile was mainly attributed to the electrostatic interaction between the positively charged molecules of AC1815 and the negatively charged rutile surface, and the hydrogen bonding between the protonated $≡NH^+$, $≡N$ group of AC1815 and $Ti-OH$ on rutile surface.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Insights into the interaction between octyl hydroxamic acid and the rutile surface activated by lead ion
Autorzy:: Cao, Qinbo
Chen, Xiumin
Zou, Heng
Yu, Xingcai
Tematy:: flotation
rutile
activation
density functional theory
adsorption; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1845214.pdf Link otwiera się w nowym oknie
Opis:: The flotation of rutile can be enhanced using lead ion as an activator. However, the binding behavior of collector on the activated rutile surface is still not fully understood. In this work, flotation and theoretical calculation approaches were employed to evaluate the activation behavior of lead ion in the flotation of rutile with octyl hydroxamic acid (OHA). Flotation results indicated that the activation flotation with lead ion should be conducted at pH 6.5. The binding features of OHA molecule on the inactivated and Pb-activated rutile surfaces were both investigated by density functional theory (DFT) studies. The OHA molecule may dissociate into OHA− anion on the inactivated rutile surface, generating a new Ti–O bond. Differently, the chelate complex of Pb-OHA anion was generated on the activated rutile surface, producing two Pb–O bonds. The adsorption of OHA onto the activated rutile surface was more stable than that on the inactivated rutile surface, due to the formation of more chemical bonds on the activated rutile surface. The DFT calculation results delineated the role of Pb2+ in the rutile flotation with OHA.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Transformations of PTCDA structures on rutile TiO_{2} induced by thermal annealing and intermolecular forces
Autorzy:: Prauzner-Bechcicki, Jakub
Glatzel, Thilo
Meyer, Ernst
Godlewski, Szymon
Szymoński, Marek
Opis:: Transformations of molecular structures formed by perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) molecules on a rutile TiO2(110) surface are studied with low-temperature scanning tunnelling microscopy. We demonstrate that metastable molecular assemblies transform into differently ordered structures either due to additional energy provided by thermal annealing or when the influence of intermolecular forces is increased by the enlarged amount of deposited molecules. Proper adjustment of molecular coverage and substrate temperature during deposition allows for fabrication of desired assemblies. Differences between PTCDA/TiO2(110) and PTCDA/TiO2(011) systems obtained through identical experimental procedures are discussed.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 5.

Tytuł:: Study of the anatase to rutile transformation kinetics of the modified TiO2
Autorzy:: Grzmil, B.
Gleń, M.
Kic, B.
Lubkowski, K.
Tematy:: TiO2
anatase
rutile
modification
phase transformation kinetics; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/779360.pdf Link otwiera się w nowym oknie
Opis:: TiO2 attracts much interest because of its many potential applications. The use of titanium dioxide strongly depends on its polymorphic form: brookite, anatase, or rutile. Only rutile and anatase play an important role in industry. Anatase as a metastable form undergoes a non-reversible transformation into rutile. Understanding the kinetics of phase transformation and the processes of crystal growth of a material is essential for controlling its structure and, thus, its specific properties. The main purpose of this paper is to explain the anatase to rutile recrystallization kinetics in the modified TiO2 calcined from industrial hydrated titanium dioxide. The apparent activation energy of anatase to rutile transformation and the average size of titanium dioxide crystallites were determined for the unmodified TiO2 and TiO2 modified with P, K, Al, B, Zn, Zr, Ce, Sn, or Sb introduced in the amount of 0.5 mol% and 1.0 mol% when recalculated for their oxides. The growth of TiO2 crystallites during calcination was strongly inhibited by P, Ce and Zr, and inhibited to a lesser degree by Al, Sn and Sb. B and Zn did not affect the investigated process and K accelerated crystallites growth. The values of apparent activation energy depending on a modifier formed a relationship: Al
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Experimental Analysis of Titanium Dioxide Synthesis from Synthetic Rutile Waste using a Moderate Acid Concentration and Temperature
Autorzy:: Ahmad Mukifza, H.
Awang, H.
Yusof, S.
Farid, E.
Tematy:: synthetic rutile
titanium dioxide
caustic hydrothermal
sodium titanate; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1031724.pdf Link otwiera się w nowym oknie
Opis:: The present study is to clarify the present influences of acid concentration and temperature of caustic hydrothermal method on extracting the titanium dioxide (TiO₂) from synthetic rutile waste. In this experimental work, the caustic hydrothermal method comprises two processes: a decomposition and the sulphate process. The extracted titanium is characterized by using a electron dispersive X-ray spectroscopy to specify its chemical composition, field emission scanning electron microscope to determine the morphology and particle size, and lastly it is the X-ray diffraction to analyse the crystallinity of extracted titanium. In this study, we found that both acid concentration and temperature affected the TiO₂ growth while the calcination process could improve the crystallinity of extracted titanium.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The removal of Fe from the reduced ilmenite via aeration leaching assessing the effect of operating parameters
Autorzy:: Ibrahim, Siti Asmidar
Yunus, Farhana
Ariffin, Kamar Shah
Sheikh Abdul Hamid, Sheikh Abdul Rezan
Ismail, Suhaina
Jabit, Nurul Ain
Tematy:: ilmenite
reduced ilmenite
aeration leaching
synthetic rutile
titanium dioxide; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2146865.pdf Link otwiera się w nowym oknie
Opis:: An upgrade of Malaysian ilmenite (FeTiO3) concentrate to synthetic rutile (TiO2) using aeration leaching was investigated in this study. Carbothermal reduction using Sarawak MukahBalingan coal and compressed National Gas (CNG) as a reductant was used to produce reduced ilmenite (RI) as an intermediate phase consisting of titanium oxide matrix with metallic iron prior to aeration leaching. Metallic iron was dissolved in ammonium chloride solution after the reduction process, separating synthetic rutile in the leaching residue. This study aims to evaluate the leaching parameters, such as concentration, temperature, and leaching time. The optimum conditions established by the design of the experiment (DOE) and the analysis of variance (ANOVA) has indicated that leaching temperature was the most significant parameter for iron dissolution. It was found that iron dissolution at a maximum value of 97.0% was achieved at an optimum condition of 0.5 M NH4Cl at 90°C for 7 hours. With an initial weight of 46 wt.%TiO2 and 37 wt.% Fe2O3, ilmenite was successfully upgraded to 80 wt.% and 8 wt.%, respectively. In conclusion, Malaysian ilmenite has a high potential value to be upgraded to synthetic rutile by aeration leaching with ammonium chloride via Becher process.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Advancing nitrate radical chemistry through electro-assisted photocatalytic cleavage of olefins
Autorzy:: Fedel, Michele
Parrino, Francesco
Kobielusz, Marcin
Macyk, Wojciech
Gottuso, Alessandro
Opis:: The photocatalytic oxidative cleavage of olefins represents a sustainable route to carbonyl compounds under mild conditions and with high atom economy. While in photocatalytic domains nitrate radicals have emerged as effective mediators for this transformation, current methodologies rely on stoichiometric silver ions as sacrificial electron scavengers, a limitation that compromises cost-efficiency and environmental sustainability. In this work, we demonstrate the selective oxidative cleavage of styrene using an electro-assisted photocatalytic (EA@PC) system, wherein an externally applied bias replaces the function of silver, enabling in situ nitrate radical generation without the need for sacrificial reagents. This strategy achieves comparable efficiency to silver-based systems while mitigating their drawbacks, representing a more scalable and environmentally compatible platform for nitrate radical-mediated oxidative transformations and advancing the practical applicability of heterogeneous photocatalysis in synthetic chemistry.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 9.

Tytuł:: Adsorption of lead ion on the hydrated rutile (110) surface: a DFT calculation study
Autorzy:: Zou, Heng
Cao, Qinbo
Chen, Xiumin
Liu, Dianwen
Tematy:: rutile
hydrated surface
lead ion
adsorption
density functional theory; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/109829.pdf Link otwiera się w nowym oknie
Opis:: The adsorption behavior of lead species on the hydrated rutile surface was investigated with inductively coupled plasma mass spectrometry (ICP-MS) measurements and density functional theory (DFT) calculations. ICP-MS experiments suggested that lead species can be readily absorbed by the rutile powder in water at pH 6.5. From the ICP-MS results and the species distribution of Pb2+, it was concluded that Pb₂₊ was the major lead species adsorbing at the rutile/water interface at the pH of 6.5. DFT calculation results indicated that Pb2+ could adsorb at four different sites on the surface. At each site, water molecules or OH groups were involved in the reaction with Pb₂₊. The water molecules/OH groups on the rutile surface play an important role during the adsorption of Pb₂₊ on the hydrated rutile surface.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Obrazowanie powierzchni TiO2 metodą mikroskopii bliskich oddziaływań
Imaging of the TiO2 surface by scanning probe microscopy
Autorzy:: Kański, Michał
Opis:: Postęp w dziedzinie syntezy i modyfikacji materiałów w skali atomowej wymusza rozwój technik badawczych, służących do charakteryzacji tych struktur. Skaningowa mikroskopia tunelowa (Scanning Tunneling Microscopy – STM) jest jedną z metod, dzięki której można obrazować powierzchnię metali i półprzewodników z atomową zdolnością rozdzielczą.Celem niniejszej pracy było zobrazowanie powierzchni [011] rutylu, jednej z odmian alotropowych tlenku tytanu (IV) przy pomocy skaningowej mikroskopii tunelowej. Wszystkie badania przeprowadzono w warunkach ultrawysokiej próżni. Podczas opracowania danych zmierzono wysokość tarasów atomowych oraz przeprowadzono analizę struktury powierzchni półprzewodnika. Wyniki porównano z danymi literaturowymi.
A progress in the field of synthesis and modification of materials in atomic scale forces an advancement in research techniques, which are used to characterise those structures. Scanning Tunneling Microscopy is one of possibilities, which allows imaging a surface of metals and semiconductors with an atomic resolution.The goal of the thesis was to image surface [011] of rutile, one of alotropic forms of titanium dioxide, with using Scanning Tunnelling Microscope. The measurements were made in ultra high vacuum conditions. A height of atomic terraces were measured and an analysis of the structure of the surface was conducted. Results were compared with the literature data.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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