1
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Rychtowski P, Paszkiewicz O, Román-Martínez MC, Lillo-Ródenas MÁ, Markowska-Szczupak A, Tryba B. Impact of TiO 2 Reduction and Cu Doping on Bacteria Inactivation under Artificial Solar Light Irradiation. Molecules 2022; 27:molecules27249032. [PMID: 36558165 PMCID: PMC9784163 DOI: 10.3390/molecules27249032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/13/2022] [Accepted: 12/15/2022] [Indexed: 12/23/2022] Open
Abstract
Preparation of TiO2 using the hydrothermal treatment in NH4OH solution and subsequent thermal heating at 500-700 °C in Ar was performed in order to introduce some titania surface defects. The highest amount of oxygen vacancies and Ti3+ surface defects were observed for a sample heat-treated at 500 °C. The presence of these surface defects enhanced photocatalytic properties of titania towards the deactivation of two bacteria species, E. coli and S. epidermidis, under artificial solar lamp irradiation. Further modification of TiO2 was targeted towards the doping of Cu species. Cu doping was realized through the impregnation of the titania surface by Cu species supplied from various copper salts in an aqueous solution and the subsequent heating at 500 °C in Ar. The following precursors were used as a source of Cu: CuSO4, CuNO3 or Cu(CH3COO)2. Cu doping was performed for raw TiO2 after a hydrothermal process with and without NH4OH addition. The obtained results indicate that Cu species were deposited on the titania surface defects in the case of reduced TiO2, but on the TiO2 without NH4OH modification, Cu species were attached through the titania adsorbed hydroxyl groups. Cu doping on TiO2 increased the absorption of light in the visible range. Rapid inactivation of E. coli within 30 min was obtained for the ammonia-reduced TiO2 heated at 500 °C and TiO2 doped with Cu from CuSO4 solution. Photocatalytic deactivation of S. epidermidis was greatly enhanced through Cu doping on TiO2. Impregnation of TiO2 with CuSO4 was the most effective for inactivation of both E. coli and S. epidermidis.
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Affiliation(s)
- Piotr Rychtowski
- Department of Catalytic and Sorbent Materials Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70–322 Szczecin, Poland
- Correspondence:
| | - Oliwia Paszkiewicz
- Department of Chemical and Process Engineering, West Pomeranian University of Technology, Piastów 42, 71–065 Szczecin, Poland
| | - Maria Carmen Román-Martínez
- Department of Inorganic Chemistry and Materials Institute (IUMA), Faculty of Sciences, University of Alicante, Carretera de San Vicente del Raspeig s/n, 03690 Alicante, Spain
| | - Maria Ángeles Lillo-Ródenas
- Department of Inorganic Chemistry and Materials Institute (IUMA), Faculty of Sciences, University of Alicante, Carretera de San Vicente del Raspeig s/n, 03690 Alicante, Spain
| | - Agata Markowska-Szczupak
- Department of Chemical and Process Engineering, West Pomeranian University of Technology, Piastów 42, 71–065 Szczecin, Poland
| | - Beata Tryba
- Department of Catalytic and Sorbent Materials Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70–322 Szczecin, Poland
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2
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Bao N, Gold JI, Sheavly JK, Schauer JJ, Zavala VM, Van Lehn RC, Mavrikakis M, Abbott NL. Ordering Transitions of Liquid Crystals Triggered by Metal Oxide-catalyzed Reactions of Sulfur Oxide Species. J Am Chem Soc 2022; 144:16378-16388. [PMID: 36047705 DOI: 10.1021/jacs.2c03424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Liquid crystals (LCs), when supported on reactive surfaces, undergo changes in ordering that can propagate over distances of micrometers, thus providing a general and facile mechanism to amplify atomic-scale transformations on surfaces into the optical scale. While reactions on organic and metal substrates have been coupled to LC-ordering transitions, metal oxide substrates, which offer unique catalytic activities for reactions involving atmospherically important chemical species such as oxidized sulfur species, have not been explored. Here, we investigate this opportunity by designing LCs that contain 4'-cyanobiphenyl-4-carboxylic acid (CBCA) and respond to surface reactions triggered by parts-per-billion concentrations of SO2 gas on anatase (101) substrates. We used electronic structure calculations to predict that the carboxylic acid group of CBCA binds strongly to anatase (101) in a perpendicular orientation, a prediction that we validated in experiments in which CBCA (0.005 mol %) was doped into an LC (4'-n-pentyl-4-biphenylcarbonitrile). Both experiment and computational modeling further demonstrated that SO3-like species, produced by a surface-catalyzed reaction of SO2 with H2O on anatase (101), displace CBCA from the anatase surface, resulting in an orientational transition of the LC. Experiments also reveal the LC response to be highly selective to SO2 over other atmospheric chemical species (including H2O, NH3, H2S, and NO2), in agreement with our computational predictions for anatase (101) surfaces. Overall, we establish that the catalytic activities of metal oxide surfaces offer the basis of a new class of substrates that trigger LCs to undergo ordering transitions in response to chemical species of relevance to atmospheric chemistry.
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Affiliation(s)
- Nanqi Bao
- Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Jake I Gold
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Jonathan K Sheavly
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - James J Schauer
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.,Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Victor M Zavala
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Reid C Van Lehn
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Manos Mavrikakis
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Nicholas L Abbott
- Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
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3
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Svensson F, Österlund L. One‐step synthesis of sulfate‐modified titania nanoparticles with surface acidic and sustained photocatalytic properties via solid‐state thermolysis of titanyl sulfate. ChemCatChem 2022. [DOI: 10.1002/cctc.202200682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Fredric Svensson
- Uppsala Universitet Teknisk-naturvetenskapliga vetenskapsomradet: Uppsala Universitet Teknisk-naturvetenskapliga fakulteten Deptarment of Materials Science and Engineering Läggerhyddsvägen 1 75103 Uppsala SWEDEN
| | - Lars Österlund
- Uppsala University: Uppsala Universitet Department of Materials Science and Engineering P.O. Box 35Lägerhyddsvägen 1 75103 Uppsala SWEDEN
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4
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R Riscoe A, Oh J, Cargnello M. Sulfur-treated TiO 2 shows improved alcohol dehydration activity and selectivity. NANOSCALE 2022; 14:2848-2858. [PMID: 35137741 DOI: 10.1039/d1nr06029e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The dehydration of alcohols is an important class of reactions for the development of fossil-free fuel and chemical industries. Acid catalysts are well known to enhance the reactivity of alcohols following two main pathways of either dehydration to olefins or dehydrogenation to ketones/aldehydes. TiO2 surfaces have been well documented for primary and secondary alcohol dehydration with selectivity ranging from 1-100% towards dehydration products based on process conditions and catalyst structure. In this work we document the effects of various sulfur treatments of TiO2 surfaces which induce higher activity and, more importantly, higher selectivity for alcohol dehydration than untreated surfaces. The increase in activity and >99% dehydration selectivity is coupled with demonstrated stability for several hours on stream at high conversion. Using temperature programmed reaction studies, XPS and FT-IR spectroscopy, we identify Lewis acidic sites correlated with sulfate species on TiO2 surfaces as active sites for the reaction.
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Affiliation(s)
- Andrew R Riscoe
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.
| | - Jinwon Oh
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Matteo Cargnello
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.
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5
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Langhammer D, Kullgren J, Österlund L. Photoinduced Adsorption and Oxidation of SO 2 on Anatase TiO 2(101). J Am Chem Soc 2020; 142:21767-21774. [PMID: 33331155 PMCID: PMC7872313 DOI: 10.1021/jacs.0c09683] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Adsorption of molecules is a fundamental step in all heterogeneous catalytic reactions. Nevertheless, the basic mechanism by which photon-mediated adsorption processes occur on solid surfaces is poorly understood, mainly because they involve excited catalyst states that complicate the analysis. Here we demonstrate a method by which density functional theory (DFT) can be used to quantify photoinduced adsorption processes on transition metal oxides and reveal the fundamental nature of these reactions. Specifically, the photoadsorption of SO2 on TiO2(101) has been investigated by using a combination of DFT and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The combined experimental and theoretical approach gives a detailed description of the photocatalytic desulfurization process on TiO2, in which sulfate forms as a stable surface product that is known to poison the catalytic surface. This work identifies surface-SO42- as the sulfate species responsible for the surface poisoning and shows how this product can be obtained from a stepwise oxidation of SO2 on TiO2(101). Initially, the molecule binds to a lattice O2- ion through a photomediated adsorption process and forms surface sulfite, which is subsequently oxidized into surface-SO42- by transfer of a neutral oxygen from an adsorbed O2 molecule. The work further explains how the infrared spectra associated with this oxidation product change during interactions with water and surface hydroxyl groups, which can be used as fingerprints for the surface reactions. The approach outlined here can be generalized to other photo- and electrocatalytic transition metal oxide systems.
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Affiliation(s)
- David Langhammer
- Department of Materials Science and Engineering, The Ångström Laboratory, Uppsala University, P.O. Box 35, SE-751 03 Uppsala, Sweden
| | - Jolla Kullgren
- Department of Chemistry, The Ångström Laboratory, Uppsala University, P.O. Box 538, SE-751 21 Uppsala, Sweden
| | - Lars Österlund
- Department of Materials Science and Engineering, The Ångström Laboratory, Uppsala University, P.O. Box 35, SE-751 03 Uppsala, Sweden
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6
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Ikram M, Hassan J, Raza A, Haider A, Naz S, Ul-Hamid A, Haider J, Shahzadi I, Qamar U, Ali S. Photocatalytic and bactericidal properties and molecular docking analysis of TiO 2 nanoparticles conjugated with Zr for environmental remediation. RSC Adv 2020; 10:30007-30024. [PMID: 35518250 PMCID: PMC9056309 DOI: 10.1039/d0ra05862a] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Accepted: 08/07/2020] [Indexed: 01/04/2023] Open
Abstract
Despite implementing several methodologies including a combination of physical, chemical and biological techniques, aquatic and microbial pollution remains a challenge to this day. Recently, nanomaterials have attracted considerable attention due to their extraordinary prospective for utilization toward environmental remediation. Among several probable candidates, TiO2 stands out due to its potential for use in multifaceted applications. One way to improve the catalytic and antimicrobial potential of TiO2 is to dope it with certain elements. In this study, Zr-doped TiO2 was synthesized through a sol-gel chemical method using various dopant concentrations (2, 4, 6, and 8 wt%). Surface morphological, microstructural and elemental analysis was carried out using FESEM and HR-TEM along with EDS to confirm the formation of Zr-TiO2. XRD spectra showed a linear shift of the (101) anatase peak to lower diffraction angles (from 25.4° to 25.08°) with increasing Zr4+ concentration. Functional groups were examined via FTIR, an ample absorption band appearing between 400 and 700 cm-1 in the acquired spectrum was attributed to the vibration modes of the Ti-O-Ti linkage present within TiO2 nanoparticles, which denotes the formation of TiO2. Experimental results indicated that with increasing dopant concentrations, photocatalytic potential was enhanced significantly. In this respect, TiO2 doped with 8 wt% Zr (sample 0.08 : 1) exhibited outstanding performance by realizing 98% elimination of synthetic MB in 100 minutes. This is thought to be due to a decreased rate of electron-hole pair recombination that transpires upon doping. Therefore, it is proposed that Zr-doped TiO2 can be used as an effective photocatalyst material for various environmental and wastewater treatment applications. The good docking scores and binding confirmation of Zr-doped TiO2 suggested doped nanoparticles as a potential inhibitor against selected targets of both E. coli and S. aureus. Hence, enzyme inhibition studies of Zr-doped TiO2 NPs are suggested for further confirmation of these in silico predictions.
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Affiliation(s)
- M Ikram
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore 54000 Punjab Pakistan
| | - J Hassan
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University 14 Ali Road Lahore Pakistan
| | - A Raza
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University 14 Ali Road Lahore Pakistan
| | - A Haider
- Department of Clinical Medicine and Surgery, University of Veterinary and Animal Sciences Lahore 54000 Punjab Pakistan
| | - S Naz
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences Tianjin 300308 China
| | - A Ul-Hamid
- Center for Engineering Research, Research Institute, King Fahd University of Petroleum & Minerals Dhahran 31261 Saudi Arabia
| | - J Haider
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences Tianjin 300308 China
| | - I Shahzadi
- College of Pharmacy, University of the Punjab Lahore 54000 Pakistan
| | - U Qamar
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University 14 Ali Road Lahore Pakistan
| | - S Ali
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University 14 Ali Road Lahore Pakistan
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7
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Ni-Doped Titanium Dioxide Films Obtained by Plasma Electrolytic Oxidation in Refrigerated Electrolytes. SURFACES 2020. [DOI: 10.3390/surfaces3020013] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Porous crystalline Ni-doped TiO2 films were produced using DC plasma electrolytic oxidation in refrigerated H2SO4 aqueous solutions containing NiSO4. The crystalline phase structure consisted of a mixture of anatase and rutile, ranging from ~30 to ~80 wt % rutile. The oxide films obtained at low NiSO4 concentration showed the highest photocurrent values under monochromatic irradiation in the UV-vis range, outperforming pure TiO2. By increasing NiSO4 concentration above a threshold value, the photoelectrochemical activity of the films decreased below that of undoped TiO2. Similar results were obtained using cyclic voltammetry upon polychromatic UV-vis irradiation. Glow discharge optical emission spectrometry (GD-OES) analysis evidenced a sulfur signal peaking at the TiO2/Ti interface. XPS spectra revealed that oxidized Ni2+, S4+ and S6+ ions were included in the oxide films. In agreement with photocurrent measurements, photoluminescence (PL) spectra confirmed that less intense PL emission, i.e., a lower electron-hole recombination rate, was observed for Ni-doped samples, though overdoping was detrimental.
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8
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Abstract
In this study, we report an investigation of the photoelectrochemical activity of TiO2 films formed by DC plasma electrolytic oxidation (PEO) at a variable potential in a sulfuric acid electrolyte at 0 and 25 °C. The surface morphology was mainly determined by the oxide-forming potential. X-Ray Diffraction and Raman analyses showed that the relative amount of the anatase and rutile phases varied from 100% anatase at low potential (110–130 V) to 100% rutile at high potential (180–200 V), while mixed-phase oxide films formed at intermediate potential. Correspondingly, the band gap of the TiO2 films decreased from about 3.20 eV (pure anatase) to 2.94 eV (pure rutile) and was red-shifted about 0.1 eV by reducing the electrolyte temperature from 25 °C to 0 °C. Glow-Discharge Optical Emission Spectroscopy (GD-OES) and X-ray Photoelectron Spectroscopy (XPS) analyses evidenced S-containing species located preferentially close to the TiO2/Ti interface. The photoelectrochemical activity was assessed by measuring the incident photon-to-current efficiency (IPCE) under Ultraviolet C (UV-C) irradiation, which showed a non-gaussian normal trend as a function of the PEO cell potential, with maximum values exceeding 80%. Photoelectrocatalytic activity was assessed by decolorization of model solutions containing methylene blue. Photoanodes having higher IPCE values showed faster decolorization kinetics.
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9
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Abbasi A, Jahanbin Sardroodi J. Prediction of a highly sensitive molecule sensor for SOx detection based on TiO2/MoS2 nanocomposites: a DFT study. J Sulphur Chem 2016. [DOI: 10.1080/17415993.2016.1229782] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Amirali Abbasi
- Molecular Simulation Laboratory (MSL), Azarbaijan Shahid Madani University, Tabriz, Iran
- Computational Nanomaterials Research Group (CNRG), Azarbaijan Shahid Madani University, Tabriz, Iran
- Department of Chemistry, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, Tabriz, Iran
| | - Jaber Jahanbin Sardroodi
- Molecular Simulation Laboratory (MSL), Azarbaijan Shahid Madani University, Tabriz, Iran
- Computational Nanomaterials Research Group (CNRG), Azarbaijan Shahid Madani University, Tabriz, Iran
- Department of Chemistry, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, Tabriz, Iran
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10
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Kohrt HE, Tumeh PC, Benson D, Bhardwaj N, Brody J, Formenti S, Fox BA, Galon J, June CH, Kalos M, Kirsch I, Kleen T, Kroemer G, Lanier L, Levy R, Lyerly HK, Maecker H, Marabelle A, Melenhorst J, Miller J, Melero I, Odunsi K, Palucka K, Peoples G, Ribas A, Robins H, Robinson W, Serafini T, Sondel P, Vivier E, Weber J, Wolchok J, Zitvogel L, Disis ML, Cheever MA. Immunodynamics: a cancer immunotherapy trials network review of immune monitoring in immuno-oncology clinical trials. J Immunother Cancer 2016; 4:15. [PMID: 26981245 PMCID: PMC4791805 DOI: 10.1186/s40425-016-0118-0] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 02/15/2016] [Indexed: 12/26/2022] Open
Abstract
The efficacy of PD-1/PD-L1 targeted therapies in addition to anti-CTLA-4 solidifies immunotherapy as a modality to add to the anticancer arsenal. Despite raising the bar of clinical efficacy, immunologically targeted agents raise new challenges to conventional drug development paradigms by highlighting the limited relevance of assessing standard pharmacokinetics (PK) and pharmacodynamics (PD). Specifically, systemic and intratumoral immune effects have not consistently correlated with standard relationships between systemic dose, toxicity, and efficacy for cytotoxic therapies. Hence, PK and PD paradigms remain inadequate to guide the selection of doses and schedules, both starting and recommended Phase 2 for immunotherapies. The promise of harnessing the immune response against cancer must also be considered in light of unique and potentially serious toxicities. Refining immune endpoints to better inform clinical trial design represents a high priority challenge. The Cancer Immunotherapy Trials Network investigators review the immunodynamic effects of specific classes of immunotherapeutic agents to focus immune assessment modalities and sites, both systemic and importantly intratumoral, which are critical to the success of the rapidly growing field of immuno-oncology.
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Affiliation(s)
- Holbrook E Kohrt
- Division of Oncology, Stanford Cancer Institute, Stanford University Medical Center, 269 Campus Drive, CCSR 1105, Stanford, CA 94305-5151 USA
| | - Paul C Tumeh
- Division of Dermatology, Department of Medicine, University of California Los Angeles, Los Angeles, CA USA
| | - Don Benson
- Division of Hematology/Oncology, Ohio State University, Columbus, OH USA
| | - Nina Bhardwaj
- Medicine, Hematology and Medical Oncology, Mount Sinai Hospital, New York, NY USA
| | - Joshua Brody
- Medicine, Hematology and Medical Oncology, Mount Sinai Hospital, Ruttenberg Treatment Center, New York, NY USA
| | - Silvia Formenti
- Department of Radiation Oncology, New York Weill Cornell Medical Center, New York, NY USA
| | - Bernard A Fox
- SOM-Molecular Microbiology & Immunology Department, Laboratory of Molecular and Tumor Immunology, OHSU Cancer Institute, Portland, OR USA
| | - Jerome Galon
- INSERM, Integrative Cancer Immunology Team, Cordeliers Research Center, Paris, France
| | - Carl H June
- Perelman School of Medicine, University of Pennsylvania, Pathology and Laboratory Medicine, Philadelphia, PA USA
| | - Michael Kalos
- Cancer Immunobiology, Eli Lilly & Company, New York, NY USA
| | - Ilan Kirsch
- Translational Medicine, Adaptive Biotechnologies Corp, Seattle, WA USA
| | - Thomas Kleen
- Immune Monitoring, Epiontis GmbH, Berlin, Germany
| | - Guido Kroemer
- Faculty of Medicine, University of Paris Descartes, Paris, France
| | - Lewis Lanier
- Department of Microbiology and Immunology, University of California, San Francisco, CA USA
| | - Ron Levy
- Division of Oncology, Stanford School of Medicine, Stanford, CA USA
| | - H Kim Lyerly
- Duke University School of Medicine, Durham, NC USA
| | - Holden Maecker
- Human Immune Monitoring Center Shared Resource, Stanford Cancer Institute, Stanford, CA USA
| | | | - Jos Melenhorst
- Product Development and Correlative Sciences, Smilow Center for Translational Research, Philadelphia, PA USA
| | - Jeffrey Miller
- Division of Hematology, Experimental Therapeutics, University of Minnesota, Oncology and Transplantation, Minneapolis, MN USA
| | - Ignacio Melero
- Centro de Investigacion Medica Aplicada, Universidad de Navarra, Avda. Pamplona, Spain
| | - Kunle Odunsi
- Center for Immunotherapy, Roswell Park Cancer Institute, Buffalo, NY USA
| | | | - George Peoples
- Cancer Vaccine Development Program, Brooke Army Medical Center, Houston, TX USA
| | - Antoni Ribas
- Tumor Immunology Program Area, Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA USA
| | | | - William Robinson
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, CA USA
| | | | - Paul Sondel
- Cellular & Molecular Pathology Graduate Program, University of Wisconsin-Madison, Madison, WI USA
| | - Eric Vivier
- Centre d'Immunologie de Marseille-Luminy, Marseille, France
| | | | - Jedd Wolchok
- Immunology Program, Memorial Sloan-Kettering Cancer Center, New York, NY USA
| | - Laurence Zitvogel
- Institut National de la Santé et Recherche Médicale, Institut GrustaveRoussy, Villejuif, France
| | - Mary L Disis
- Tumor Vaccine Group, University of Washington, Seattle, WA USA
| | - Martin A Cheever
- Fred Hutchinson Cancer Research Center, 1100 Eastlake Ave N., E3-300, PO Box 19024, Seattle, WA 98109-1023 USA
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11
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Chen WC, Wang XL, Jiao YQ, Huang P, Zhou EL, Su ZM, Shao KZ. pH-controlled and sulfite anion-directed assembly of a family of cerium(III)-containing polyoxotungstates clusters. Inorg Chem 2014; 53:9486-97. [PMID: 25153270 DOI: 10.1021/ic500442k] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A versatile one-pot strategy was employed to synthesize five cerium(III)-containing polyoxotungstate nanoclusters through pH-controlled and sulfite anion-directed assembly: [C2H8N]3Na7[Ce2(H2O)6W22O72(OH)4]·20H2O (1) at pH 5.0; [C2H8N]8Na16[Ce4(H2O)12W44O144(OH)12]·23H2O (2) at pH 4.5; [C2H8N]2Na4Ce2[Ce2(H2O)10W28O92(OH)2]·27H2O (3) at pH 2.8-3.3; [C2H8N]2Na7[{α-SW7O28}{Ce2(H2O)6}(W3O6){α-SW9O32}{α-SW9O31(OH)}]·18H2O (4) at pH 2.5; [C2H8N]2Na18[Ce2(H2O)9W36O110(OH)12]2·30H2O (5) at pH 1.5. These compounds were characterized by single-crystal X-ray structure analysis, IR spectroscopy, thermogravimetric (TG) analysis, X-ray photoelectron spectroscopy (XPS), and electrospray ionization mass spectrometry (ESI-MS). Moreover, their electrochemical properties were investigated. Single-crystal X-ray structure analysis revealed that 1 and 2 were di- and tetra-cerium(III)-bridged polyoxotungstates, constructed from two different types of lacunary {W11} units. 3 composed of the well-known cerium(III)-stabilized {W28} unit and organic amine-sodium-cerium cations, was isolated in the pH range 2.8-3.3. In this reaction system, the SO3(2-) anion acted as a heteroanion template at a lower pH 2.5. 4 was isolated by the combination of cerium(III) centers and SO3(2-) heteroanion template, which is the first lanthanide-containing polyoxotungstates with sulfur heteroatoms, and the 4f metal cerium(III) centers in 4 both have eight-coordinated modes and the SO3(2-) heteroanion templates display μ7 and μ9 coordination modes. At a much lower pH 1.5, the polyanion of 5 was obtained, two triangular-shaped {W36} subunits were bridged by the cerium(III) ions, resulting in the largest lanthanide-containing iso-polyoxotungstates known to date.
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Affiliation(s)
- Wei-Chao Chen
- Department Institute of Functional Material Chemistry, Key Lab of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University , Changchun 130024, P. R. China
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12
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Liu K, Cao M, Fujishima A, Jiang L. Bio-Inspired Titanium Dioxide Materials with Special Wettability and Their Applications. Chem Rev 2014; 114:10044-94. [DOI: 10.1021/cr4006796] [Citation(s) in RCA: 427] [Impact Index Per Article: 42.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Kesong Liu
- Key
Laboratory of Bio-Inspired Smart Interfacial Science and Technology
of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, PR China
- Institute
for Superconducting and Electronic Materials, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, NSW 2500, Australia
| | - Moyuan Cao
- Key
Laboratory of Bio-Inspired Smart Interfacial Science and Technology
of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, PR China
| | - Akira Fujishima
- Research
Institute for Science and Technology, Photocatalysis International
Research Center, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Lei Jiang
- Key
Laboratory of Bio-Inspired Smart Interfacial Science and Technology
of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, PR China
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
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13
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Wanag A, Kusiak-Nejman E, Kapica J, Kowalczyk Ł, Morawski AW. Nitrogen-Modified Titanium Dioxide as an Adsorbent for Gaseous SO 2. ADSORPT SCI TECHNOL 2014. [DOI: 10.1260/0263-6174.32.5.403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Affiliation(s)
- Agnieszka Wanag
- Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Pułaskiego 10, 70-322 Szczecin, Poland
| | - Ewelina Kusiak-Nejman
- Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Pułaskiego 10, 70-322 Szczecin, Poland
| | - Joanna Kapica
- Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Pułaskiego 10, 70-322 Szczecin, Poland
| | - Łukasz Kowalczyk
- Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Pułaskiego 10, 70-322 Szczecin, Poland
| | - Antoni W. Morawski
- Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Pułaskiego 10, 70-322 Szczecin, Poland
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Topalian Z, Stefanov B, Granqvist C, Österlund L. Adsorption and photo-oxidation of acetaldehyde on TiO2 and sulfate-modified TiO2: Studies by in situ FTIR spectroscopy and micro-kinetic modeling. J Catal 2013. [DOI: 10.1016/j.jcat.2013.08.004] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Nisar J, Topalian Z, De Sarkar A, Österlund L, Ahuja R. TiO2-based gas sensor: a possible application to SO2. ACS APPLIED MATERIALS & INTERFACES 2013; 5:8516-8522. [PMID: 23915321 DOI: 10.1021/am4018835] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Fixation of SO2 molecules on anatase TiO2 surfaces with defects have been investigated by first-principles density functional theory (DFT) calculations and in situ Fourier transform infrared (FTIR) surface spectroscopy on porous TiO2 films. Intrinsic oxygen-vacancy defects, which are formed on TiO2(001) and TiO2(101) surfaces by ultraviolet (UV) light irradiation and at elevated temperatures, are found to be most effective in anchoring the SO2 gas molecules to the TiO2 surfaces. Both TiO2(101) and TiO2(001) surfaces with oxygen vacancies are found to exhibit higher SO2 adsorption energies in the DFT calculations. The adsorption mechanism of SO2 is explained on the basis of electronic structure, charge transfer between the molecule and the surface, and the oxidation state of the adsorbed molecule. The theoretical findings are corroborated by FTIR experiments. Moreover, the (001) surface with oxygen vacancies is found to bind SO2 gas molecules more strongly, as compared to the (101) surface. Higher concentration of oxygen vacancies on the TiO2 surfaces is found to significantly increase the adsorption energy. The results shed new insight into the sensing properties of TiO2-based gas sensors.
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Affiliation(s)
- Jawad Nisar
- Condensed Matter Theory Group, Department of Physics and Astronomy, Uppsala University , Box 516, SE-751 20 Uppsala, Sweden
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Chang H, Chen X, Li J, Ma L, Wang C, Liu C, Schwank JW, Hao J. Improvement of activity and SO₂ tolerance of Sn-modified MnOx-CeO₂ catalysts for NH₃-SCR at low temperatures. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:5294-5301. [PMID: 23582170 DOI: 10.1021/es304732h] [Citation(s) in RCA: 190] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The performances of fresh and sulfated MnOx-CeO₂ catalysts for selective catalytic reduction of NOx by NH₃ (NH₃-SCR) in a low-temperature range (T < 300 °C) were investigated. Characterization of these catalysts aimed at elucidating the role of additive and the effect of sulfation. The catalyst having a Sn:Mn:Ce = 1:4:5 molar ratio showed the widest SCR activity improvement with near 100% NOx conversion at 110-230 °C. Raman and X-ray photoelectron spectroscopy (XPS) indicated that Sn modification significantly increases the concentration of oxygen vacancies that may facilitate NO oxidation to NO₂. NH₃-TPD characterization showed that the low-temperature NH₃-SCR activity is well correlated with surface acidity for NH3 adsorption, which is also enhanced by Sn modification. Furthermore, as compared to MnOx-CeO₂, Sn-modified MnOx-CeO₂ showed remarkably improved tolerance to SO₂ sulfation and to the combined effect of SO₂ and H₂O. In the presence of SO₂ and H₂O, the Sn-modified MnOx-CeO₂ catalyst gave 62% and 94% NOx conversions as compared to 18% and 56% over MnOx-CeO₂ at temperatures of 110 and 220 °C, respectively. Sulfation of SnO₂-modified MnOx-CeO₂ may form Ce(III) sulfate that could enhance the Lewis acidity and improve NO oxidation to NO₂ during NH₃-SCR at T > 200 °C.
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Affiliation(s)
- Huazhen Chang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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