Article
Chemistry, Multidisciplinary
Mohammed Asaad Mahdi, Mohammed A. Farhan, Zaid H. Mahmoud, Ahmed Mahdi Rheima, Zainab Sabri Abbas, Mustafa M. Kadhim, Alaa Dhari Jawad Al-bayati, Asala Salam Jaber, Safa K. Hachim, Ahmad Hussain Ismail
Summary: Photolysis was used to produce TiO2 nanoparticles with exposed (001) facets, which were then modified by incorporating rGO sheets at different wt.% concentrations. The resulting nanocomposites were characterized using various techniques, confirming the formation of anatase phase TiO2 and revealing the morphology and surface bonding of the rGO/TiO2 nanocomposites. The optical properties and photodegradation efficiency of the nanocomposites were investigated, and it was found that the 5 wt.% rGO-doped TiO2 showed the highest efficiency for the photodegradation of CR dye. Furthermore, the nanocomposites exhibited a high number of oxygen vacancies and showed excellent performance in the breakdown of CR dye under direct sunlight.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
S. Amaya-Roncancio, D. A. Torres-Ceron, J. P. Velasquez-Tamayo, D. F. Mercado, I. D. Arellano-Ramirez, E. Restrepo-Parra
Summary: TiO2/SO42-surfaces were used to reduce Cr(VI) to Cr(III) in wastewater. X-ray photoelectron spectroscopy and density functional theory were used to study the adsorption behavior of Cr(VI) and Cr(III) on TiO2/SO42-surfaces. The results show that Cr(III) (in the form of Cr(OH)3) and Cr(VI) (in the form of CrO42-) are present on the surfaces. The presence of OH- weakens the interaction between the surface and Cr(VI), while it stabilizes the formation of Cr(III) on the surface.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Si-Ming Wu, Yi-Tian Wang, Shi-Tian Xiao, Li-Ying Wang, Ge Tian, Jiang-Bo Chen, Jia-Wen Liu, Menny Shalom, Xiao-Yu Yang
Summary: The design of n-p homojunctions in semiconductors enables directed charge transfer and leads to significant enhancement in photoelectrochemical and photocatalytic performance. A spatial n-p homojunction in TiO2 has been achieved by decorating TiO2 nanosheets with Ti vacancies, providing a facile strategy for the design of high-performance semiconductors.
Article
Chemistry, Physical
Ting Wang, Kai Chen, Renxian Zhou
Summary: The Pt-Pd bimetallic catalysts with atomic-level alloy structure exhibit superior catalytic performance, especially for NO and HC conversions, due to their higher dynamic oxygen storage/release capacity. The presence of H2O and CO2 has little influence on the catalytic activity of Pt0.8Pd0.2/CZL, making it a promising catalyst for emissions control.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Steven Vargas-Villanueva, Darwin Augusto Torres-Ceron, S. Amaya-Roncancio, I. D. Arellano-Ramirez, Julieta Soledad Riva, Elisabeth Restrepo-Parra
Summary: In this study, TiO2/SO42- material was synthesized by Plasma Electrolytic Oxidation (PEO) and characterized by Raman, XRD, and XPS. DFT simulations were carried out to validate the experimental results. The synthesized material showed the presence of anatase and rutile phase of TiO2 and the existence of SO42- on the surface and in the bulk. DFT calculations demonstrated the energetically favorable quantification of sulfate ions on the Ti site.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Liting Fu, Xuguang Zhao, Zhu Meng, Jing Zhang, Gang Chu
Summary: A series of LaBO3:Pr3+ luminescent materials were prepared using lanthanum nitrate hexahydrate and boric acid as raw materials, glycine as combustion agent and praseodymium nitrate hexahydrate as modifier. The phase structure, micro morphology and ionic valence of the materials were analyzed, and the fluorescence properties of the materials were characterized. The results showed that Pr3+ ions successfully entered the lattice of LaBO3 after calcination at 850 degrees C for 4 hours. The main luminescence peak of LaBO3:Pr3+ powder was located at 670 nm at the excitation wavelength of 448 nm, and the luminescence intensity was the highest when the doping ratio was 0.03.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Huicheol Choe, Soong Yeon Kim, Shufang Zhao, Byeong Jun Cha, Thomas Grehl, Philipp Bruener, Young Dok Kim
Summary: Commercial rutile TiO2 particles capped with Al2O3 and ZrO2 layers were used as a starting material for visible light-responsive gas-phase NO oxidation photocatalysts. The study found that the photocatalytic activity of TiO2 with iron impurities was improved by the deposition of additional iron comparable to the intrinsic iron impurity level. Analysis using various spectroscopy techniques revealed differences in location, oxidation states, and interaction with TiO2 between the deposited iron and intrinsic impurity iron.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Elea Vernack, Sandrine Zanna, Antoine Seyeux, Dominique Costa, Fatah Chiter, Philippe Tingaut, Philippe Marcus
Summary: X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ions mass spectrometry (ToF-SIMS) analyses were used to investigate the interaction between copper and mercaptobenzothiazole (MBT) in aqueous solution with and without NaCl. MBT forms multilayers on the copper oxide surface, inhibiting oxide layer growth and chloride adsorption. The adsorption of MBT also inhibits copper dissolution in NaCl.
Article
Materials Science, Coatings & Films
Darwin Augusto Torres-Ceron, S. Amaya-Roncancio, Julieta Soledad Riva, Aldemir Vargas-Eudor, Daniel Escobar-Rincon, Elisabeth Restrepo-Parra
Summary: In this study, the incorporation of P ions in TiO2 coatings was investigated using the PEO technique and analyzed through XPS and DFT simulations. The results revealed the presence of various structural defects due to the incorporation of P ions into the crystal lattice. Computational calculations showed that the single replacement of P at the Ti site is energetically preferred.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Wallace T. Figueiredo, Ravi Prakash, Clovis G. Vieira, Dirlleia S. Lima, Vagner E. Carvalho, Edmar A. Soares, Silvio Buchner, Hannes Raschke, Oscar W. Perez-Lopez, Daniel L. Baptista, Roland Hergenroder, Maximiliano Segala, Fabiano Bernardi
Summary: This study utilized NAP-XPS, UPS, and DFT calculations to investigate the electronic factor of the SMSI effect in Pd/TiO2 nanoparticles, revealing charge transfer from Pd nanoparticles to TiO2 support through Pd-O-Ti entities at the Pd-TiO2 interface during reduction treatment at 300 degrees C.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Jingting Hou, Zeming Tang, Keyan Wei, Qingxue Lai, Yanyu Liang
Summary: The study focuses on optimizing the surface reconstruction of PBAs by incorporating Ni into Co-Fe PBAs nanocubes as an efficient OER catalyst. The addition of Ni enhances surface reconstruction, leading to metal oxyhydroxides as the major active sites for OER electrocatalysis, significantly accelerating OER kinetics. The NiCo-Fe PBAs electrode exhibits excellent catalytic activity with low overpotential and Tafel slope.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Achraf El Kasmi, Muhammad Fahad Arshad, Muhammad Waqas, Cedric Karel Fonzeu Monguen, Fatima-Zahra Azar, Ling-Nan Wu, Zhen-Yu Tian
Summary: Cu thin films were synthesized using chemical vapor deposition for catalytic study of CO oxidation. The obtained samples showed uniform morphology and porous textures. X-ray diffraction and X-ray photoelectron spectroscopy confirmed the formation of pure Cu metal and its metallic state on the surface.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Energy & Fuels
Deivanayagam Hariharan, Sundar Rajan Krishnan, Kalyan Kumar Srinivasan, Aamir Sohail
Summary: Experimental results demonstrate that dual diesel injection in dual-fuel low temperature combustion can reduce both HC and CO emissions without compromising NOx and PM benefits. By oxidizing HC with a second late diesel injection, reductions in ISNOx, ISHC, and ISCO emissions, as well as increases in IFCE and combustion efficiency, were achieved. Smoke emissions increased slightly, but remain lower than for conventional diesel operation.
Article
Chemistry, Physical
Sara Blomberg, Uta Hejral, Mikhail Shipilin, Stefano Albertin, Hanna Karlsson, Christian Hulteberg, Patrick Loemker, Christopher Goodwin, David Degerman, Johan Gustafson, Christoph Schlueter, Anders Nilsson, Edvin Lundgren, Peter Amann
Summary: Performing fundamental operando catalysis studies under realistic conditions is crucial for industrial catalyst efficiency improvement. This study conducted CO oxidation experiments on Pd(100) at 1 bar total pressure using XPS, revealing surface chemical composition at an atomistic level and tracking reaction kinetics in real-time based on observed gas-phase photoemission peaks.
Article
Chemistry, Physical
D. A. Zatsepin, D. W. Boukhvalov, A. F. Zatsepin
Summary: X-ray photoelectron spectroscopy (XPS) was used to study the electronic structure and surface states of GaN epitaxial films grown on Al2O3 and SiC substrates. After three years of storage in standard air conditions, only traces of surface oxidation were detected. First-principle modeling showed that GaN surface acidification is favorable in humid conditions, while oxidation process is slower in dry air conditions.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Paper & Wood
Bhaskar Devu Mukri, Killi Krushnamurty, Arif Chowdhury, Duvvuri Suryakala, Challapalli Subrahmanyam
Article
Chemistry, Multidisciplinary
Bhairi Lakshmi Narayana, Bhaskar Devu Mukri, P. Ghosal, Ch Subrahmanyam
Article
Chemistry, Physical
N. Mahadevaiah, Preetam Singh, Bhaskar Devu Mukri, Sanjit K. Parida, M. S. Hegde
APPLIED CATALYSIS B-ENVIRONMENTAL
(2011)
Article
Chemistry, Physical
Bhaskar Devu Mukri, Umesh V. Waghmare, M. S. Hegde
CHEMISTRY OF MATERIALS
(2013)
Article
Chemistry, Inorganic & Nuclear
Sudhanshu Sharma, Bhaskar Devu Mukri, M. S. Hegde
DALTON TRANSACTIONS
(2011)
Article
Chemistry, Physical
Tinku Baidya, Parthasarathi Bera, Bhaskar Devu Mukri, Sanjit Kumar Panda, Oliver Kroecher, Martin Elsener, M. S. Hegde
JOURNAL OF CATALYSIS
(2013)
Article
Chemistry, Multidisciplinary
Bhaskar Devu Mukri, M. S. Hegde
JOURNAL OF CHEMICAL SCIENCES
(2017)
Article
Chemistry, Multidisciplinary
S. R. Sanjaykumar, Bhaskar Devu Mukri, Satish Patil, Giridhar Madras, M. S. Hegde
JOURNAL OF CHEMICAL SCIENCES
(2011)