Article
Environmental Sciences
Guy Didier Fanou, Mamadou Traore, Benjamin Kouassi Yao, Andrei Kanaev, Khay Chhor
Summary: A new composite photocatalyst was developed by grafting size-selected 5-nm titanium-oxo-alkoxo nanoparticles onto P25-TiO2 nanoparticles and incorporating HAP obtained by co-precipitation of salts. The photocatalytic yield was increased for the composite photocatalysts with the addition of HAP, likely due to a synergy between adsorption and photo-oxidation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Materials Science, Ceramics
S. Lopez-Esteban, B. Cabal, A. Borrell, J. F. Bartolome, A. Fernandez, M. Faraldos, A. Bahamonde, J. S. Moya, C. Pecharroman
Summary: This study investigates the properties of TiO2-anatase nanoparticles attached by a low-melting point inorganic glass. The composition does not contain toxic metals and shows excellent wettability on ceramic nanoparticles. The mechanical strength of the composites is remarkably enhanced by adding a small amount of glass, and the self-cleaning properties of TiO2-anatase are not affected by the presence of the glass.
CERAMICS INTERNATIONAL
(2021)
Article
Environmental Sciences
N. Ramesh Reddy, U. Bharagav, M. V. Shankar, P. Mohan Reddy, Kakarla Raghava Reddy, Nagaraj P. Shetti, Fernando Alonso-Marroquin, M. Mamatha Kumari, Tejraj M. Aminabhavi, Sang Woo Joo
Summary: Silver nanoparticles doped with FCNT-TiO2 heterogeneous catalyst were prepared via one-step chemical reduction process for hydrogen production testing under a solar simulator. The optimized catalyst showed high hydrogen production and good stability.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Biochemistry & Molecular Biology
Ximena Jaramillo-Fierro, John Ramon, Eduardo Valarezo
Summary: This study investigates the removal of cyanide species from aqueous solutions using the ZnTiO3/TiO2/H2O2/UVB system. The experimental results show that this system is effective in removing cyanide and has good detoxification effect.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Environmental Sciences
Xiao Qu, Chuntao Chen, Jianbin Lin, Wei Qiang, Lei Zhang, Dongping Sun
Summary: Photocatalytic technology is effective for pollutants removal, but has limitations. By constructing a heterostructure with defect-rich TiO2 anchored in g-C3N4, this study achieved enhanced degradation of organic pollutants, providing a potential approach for improved photocatalytic activity.
Article
Engineering, Environmental
Haodong Ji, Wen Liu, Fengbin Sun, Taobo Huang, Long Chen, Yue Liu, Juanjuan Qi, Chenghan Xie, Dongye Zhao
Summary: In this study, TiO2/SiO2 photocatalysts were prepared and the calcination temperature of 800 degrees C resulted in the highest photocatalytic activity for phenanthrene degradation. The composite material showed minimal phenanthrene uptake but strong photocatalytic activity, with the formation of Ti3+ under solar light irradiation promoting photoexcited electron trap and separation of electron-hole pairs. High electrophilic Fukui index atoms of phenanthrene were identified as the most reactive sites towards radicals during the degradation process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Mahmoud Abid, Abdesslem Ben Haj Amara, Mikhael Bechelany
Summary: Halloysite nanotubes (HNTs) are clay minerals that can be used instead of carbon nanotubes for various applications. They are non-toxic, biocompatible, and easily prepared. The aluminum and silica groups on their surfaces allow interaction with different functional agents, enabling the deposition of various materials. This review article focuses on HNT applications in water purification, particularly HNT-TiO2 composites as promising photocatalysts.
Article
Chemistry, Physical
R. Gustavo J. Chacon, Fabiano S. Rodembusch, Brunno L. Albuquerque, Wellington D. G. Goncalves, Jonder Morais, Daniel L. Baptista, Allan de Moraes Lisboa, Adriano Feil, Dario Eberhardt, Jose Espeso, Jairton Dupont
Summary: In this study, a photocatalytic device based on gold nanoparticles coated with an ionic liquid was developed for hydrogen evolution reactions via methanol photo reforming and photocatalytic water-splitting. The device prepared through magnetron sputtering exhibited direct Au-TiO2 interactions and the presence of the ionic liquid enhanced the photocatalytic performance. The results showed high apparent quantum yield values for hydrogen evolution using the prepared materials.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Vytautas Kavaliunas, Paulius Ceplikas, Mantas Sriubas, Giedrius Laukaitis
Summary: The study investigates the formation of Ag nanoparticles on the surface of TiO2 to enhance photocatalytic efficiency. The optimal annealing temperature and time were chosen to form Ag nanoparticles, and the results demonstrated that Ag nanoparticles can enhance the photocatalytic efficiency of TiO2 thin films.
APPLIED SCIENCES-BASEL
(2022)
Article
Green & Sustainable Science & Technology
Jyoti Saroha, Ekta Rani, Meenakshi Devi, Prathap Pathi, Mahesh Kumar, Shailesh Narain Sharma
Summary: Wastewater from textile industries containing organic pollutants is a global concern, and semiconductor nanocomposites have been explored for treatment. In this study, Au/Ag-TiO2 nanocomposites were synthesized and exhibited enhanced photocatalytic activity for the degradation of organic dyes in wastewater. The enhanced activity was attributed to the broad range absorption of visible light and effective charge transfer in the Au-TiO2 nanocomposites. The research provides insights into the physics underlying the enhanced photocatalytic performance of Au-TiO2 nanocomposites for organic pollutant removal.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Chemistry, Physical
C. Gomez-Polo, S. Larumbe, A. Gil, D. Munoz, L. Rodriguez Fernandez, L. Fernandez Barquin, A. Garcia-Prieto, M. L. Fdez-Gubieda, A. Muela
Summary: The study investigates the effects of Cr and N doping on the properties of TiO2 anatase nanoparticles, including adsorption capacity, photocatalytic performance, and antibacterial response. Doping with Cr and Cr/N enhances adsorption capacity and photocatalytic performance, with Cr-TiO2 nanoparticles exhibiting antibacterial activity under visible light. The differences in electrostatic charge and nanoparticle dispersion are suggested as the main reasons for the varied antibacterial response among the doped nanoparticles.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Weizi Zhang, Xinxin Li, Shaoru Liu, Jianhao Qiu, Jiahuan An, Jianfeng Yao, Songlin Zuo, Bo Zhang, Haian Xia, Changzhi Li
Summary: In this study, Ag/TiO2 materials with different interfacial structures were prepared and used for the photocatalytic conversion of biomass-derived 5-HMF to value-added HMFCA. It was found that low-temperature reduction could enhance the photoinduced charge separation efficiency and the localized surface plasmon resonance effects. The 2.5% Ag/TiO2-LTR showed the highest HMFCA selectivity of 96.7% under visible-light illumination. However, the photocatalytic efficiency decreased significantly when the reduction temperature increased due to the encapsulation of Ag NPs by a thicker TiOx overlay.
Article
Materials Science, Multidisciplinary
Mohd Fadhil Majnis, Ong Chia Yee, Mohd Azam Mohd Adnan, Mohd Rashid Yusof Hamid, Ku Zilati Ku Shaari, Nurhidayatullaili Muhd Julkapli
Summary: In this study, chitosan and zirconia were integrated into titanium dioxide nanoparticles through a sol-gel fabrication method to generate CS-ZrO2/TiO2 catalyst. The hybrid catalyst showed reduced band gap energy, enhanced photocatalytic activity, and improved photodegradation efficiency of model dye compounds under solar irradiation.
Article
Nanoscience & Nanotechnology
Qing-Yu Liu, Hao-Dong Wang, Rui Tang, Quan Cheng, Yong-Jun Yuan
Summary: In this study, rutile titanium dioxide (TiO2) nanoparticles with large specific surface area and abundant oxygen vacancy were designed for photocatalytic nitrogen fixation, showing high photocatalytic performance with the highest ammonia generation rate exceeding 6.5 times that of P25. This research provides a simple and facile method to prepare highly reactive TiO2 photocatalysts for enhanced photocatalytic nitrogen fixation performance.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Alejandra Romero-Moran, Jose L. Sanchez-Salas, Joel Molina-Reyes
Summary: The study established the influence of the crystalline phase and agglomeration degree of TiO2 nanoparticles on photocatalytic hydroxyl radical formation and bacterial inactivation in TiO2/SiO2 composite coatings. A relationship between hydroxyl radicals' formation and charge carrier transfer mechanism between defect levels in SiO2 and TiO2 embedded nanoparticles was established through a simple spectroscopic method. This correlation complements the lack of mechanisms behind the photocatalytic activity in TiO2/SiO2 composites.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Review
Polymer Science
Jianwen Chen, Yutian Zhu, Jinrui Huang, Jiaoxia Zhang, Duo Pan, Juying Zhou, Jong E. Ryu, Ahmad Umar, Zhanhu Guo
Summary: Conductive polymer composites (CPCs) have good processability and various functionalities, with electrical resistance dominated by conductive networks. Utilizing stimulus-response behavior of these networks, CPCs can be used to design sensitive sensors to monitor environmental conditions, showing potential for versatile sensor applications.
Article
Chemistry, Physical
Surabhi Mishra, Pravin Kumar Singh, Rajesh K. Yadav, Ahmad Umar, Pooja Lohia, D. K. Dwivedi
Summary: This paper investigates the linear and nonlinear properties of Sb-doped Ge-Se-Te glasses for optoelectronic applications, including refractive index, optical conductivity, dielectric constants, and energy losses. Various models and formulas were used to analyze the experimental data and provide a comprehensive understanding of the samples.
Article
Chemistry, Analytical
Ahmad Umar, M. Shaheer Akhtar, Sadia Ameen, M. Imran, Rajesh Kumar, Yao Wang, Ahmed A. Ibrahim, H. Albargi, Mohammed Jalalah, Mabkhoot A. Alsaiari, M. S. Al-Assiri
Summary: This work describes the preparation of spinel NiMn2O4 nanodisks decorated reduced graphene oxide (rGO) via low-temperature colloidal solution method and analyzes their performances as electro-active electrode for electrochemical sensor and supercapacitors. The results showed high sensitivity and specific capacitance of the NiMn2O4/rGO composite, making it a promising electrode material for high-performance sensing and supercapacitors.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Jincheng Fan, Hao Li, Huiyun Hu, Yue Niu, Ruiting Hao, Ahmad Umar, M. S. Al-Assiri, Mabkhoot A. Alsaiari, Yao Wang
Summary: In this study, a room temperature formaldehyde sensor was developed using ZnO nanoparticles and graphene material, capable of detecting as low as 5 ppm of HCHO. The excellent gas sensing performances, including high selectivity and reversibility, were attributed to the synergistic effects of 5-aminonaphthalene-1-sulfonic acid (ANS) and ZnO nanoparticles, with ANS facilitating charge transfer for lower energy barrier detection.
MICROCHEMICAL JOURNAL
(2021)
Article
Materials Science, Ceramics
Ahmad Umar, Ahmed A. Ibrahim, H. Y. Ammar, Umesh T. Nakate, Hasan B. Albargi, Y. B. Hahn
Summary: The synthesis, characterizations and gas sensor application of nano-textured urchin like CuO hollow microspheres were reported. The fabricated CuO sensor device showed elevated response towards ethanol with high selectivity after optimization of operating temperature and concentration. The developed gas sensor devices demonstrated outstanding selectivity towards ethanol gas and the ethanol sensing mechanism was elucidated using density functional theory computational quantum modeling.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Ahmad Umar, Ahmed A. Ibrahim, Umesh T. Nakate, Hasan Albargi, Mabkhoot A. Alsaiari, Faheem Ahmed, Fahad A. Alharthi, Abdulaziz Ali Alghamdi, Nabil Al-Zaqri
Summary: The ethanol sensing properties of nanocrystalline copper oxide (CuO) nanoplates were studied and a sensor based on CuO nanoplates showed a high ethanol response at 250 degrees C. The sensor exhibited high selectivity in the presence of various gases such as NO2, CO2, CH4, and H-2. The CuO nanoplates based gas sensor was also tested for transient ethanol response and stability.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Environmental Sciences
Prachi Chaudhary, Vikas Beniwal, Ahmad Umar, Raman Kumar, Priyanka Sharma, Anil Kumar, Yas Al-Hadeethi, Vinod Chhokar
Summary: Industrial wastes, such as tannery wastes, contain bacteria resistant to Chromium (Cr) and tannic acid (TA), which can effectively remove these pollutants through co-culture. Optimization of physio-chemical parameters enhances the efficiency of co-culture system, showing potential for degradation of other heavy metals by the isolated bacteria.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Chemistry, Physical
Xiaojing Lin, Mingxuan Sun, Bowen Gao, Wen Ding, Zihan Zhang, Sambandam Anandan, Ahmad Umar
Summary: A series of mixed-phases TiO2 were fabricated using a mild hydrothermal process, resulting in nanocrystals with different combinations of anatase, rutile, and brookite phases. While the triphase TiO2 showed the longest optical edge in UV-vis absorption spectroscopy, the diphase TiO2 exhibited higher degradation ratio of levofloxacin. This study provides insights into regulating the phase ratio of TiO2 for environmental remediation applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Ahmad Umar, Ahmed A. Ibrahim, Rajesh Kumar, Hasan Albargi, Mabkhoot A. Alsaiari, Faheem Ahmed
Summary: The study investigated the synthesis, characterization, and ethanol gas sensing properties of hematite iron oxide microstructures. The fabricated sensor demonstrated a high response to ethanol gas compared to CO and H-2 gases, with a proposed ethanol sensing mechanism.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Physical
Rahul S. Salunke, Yogesh T. Nakate, Ahmad Umar, Umesh T. Nakate, Rafiq Ahmad, Dhammanand J. Shirale
Summary: The sensor electrode with gold nanoparticles (AuNPs) functionalized single polypyrrole nanowire (PpyNW) showed high sensitivity and an ultra-low detection limit during arsenic (III) detection in solution.
SURFACES AND INTERFACES
(2021)
Article
Biochemical Research Methods
Shafali Singh, Sushil Kumar Kansal
Summary: The study developed a carbon dots-based fluorescence sensor that can detect Fe3+ and Hg2+ ions simultaneously in the same aqueous solution, with high sensitivity and selectivity.
JOURNAL OF FLUORESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Sakshi Walia, Manpreet Kaur, Sushil Kumar Kansal
Summary: This study successfully synthesized an amine functionalized chromium based metal organic framework (NH2-MIL-101(Cr)) using the hydrothermal method. The prepared MOF was characterized for its structural, textural, morphological, and thermal properties. The NH2-MIL-101(Cr) showed a high surface area of 1321 m2/g and exhibited remarkable adsorption capacity for 2,4-dinitrophenol removal. Optimization studies were conducted for various process conditions, and the adsorption mechanism and data were analyzed. The results suggest that the hydrogen bonding interactions between the nitro group of 2,4-dinitrophenol and the amino group of NH2-MIL-101(Cr) contribute to its high adsorption tendency.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Applied
Sahil Kumar, Kanika Saini, Shunmugavel Saravanamurugan, Xiaolei Zhang, Sushil Kumar Kansal
Summary: This study focuses on synthesizing sulfate functionalized niobium oxide-based catalyst for the acetalation of biomass-derived glucose. The results show that the sulfate groups incorporated NbOx-DS catalyst exhibits superior catalytic activity and selectivity compared to commercial niobium oxide catalyst (NbOx-CS). The study highlights the importance of the synthesis procedure for efficient incorporation of sulfate groups.
TOPICS IN CATALYSIS
(2022)
Article
Chemistry, Physical
Hadi Ali, Tom Vandevyvere, Jeroen Lauwaert, Sushil Kumar Kansal, Maarten K. K. Sabbe, Shunmugavel Saravanamurugan, Joris W. W. Thybaut
Summary: The present study focuses on designing a robust non-noble metal-based niobia-supported catalyst with a high number of oxygen vacancies for efficient HDO activity of anisole. Different synthesis procedures were adopted for the preparation of the Nb2O5 support, followed by Ni impregnation. The catalysts exhibited differences in surface areas, crystallite size, metal-support interaction, active interfacial species, and oxygen vacancies. Ni impregnated on Nb2O5-H had the highest amount of oxygen vacancies and showed the highest HDO activity of anisole.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Rekha Yadav, Aditi Sugha, Manpreet S. Bhatti, Sushil K. Kansal, Sudhir K. Sharma, Tuhin K. Mandal
Summary: This study analyzed fog samples collected from the rooftop of Guru Nanak Dev University in Amritsar, India, and found that sulfate was the dominant pollutant in the fog, mainly originating from vehicular exhaust emissions from burning fossil fuels. Multiple regression analysis showed that the PM2.5/PM10 ratio and relative humidity have an exponential effect on visibility.