Article
Chemistry, Physical
Hiroyuki Takeda, Yu Monma, Osamu Ishitani
Summary: Two dinuclear Cu(I) complexes were synthesized, with one showing outstanding redox photosensitizing properties for photocatalytic CO2 reduction. A Fe(II) complex was used as the catalyst, resulting in a 14.1% quantum yield of CO production. The Cu dimer displayed significant durability and a high turnover number in the reaction.
Article
Chemistry, Physical
Nasim Rahmati Hendekhale, Ali Mohammad-khah
Summary: Different mass ratios of g-C3N4 were used to synthesized Cobalt Zirconate/g-C3N4 hybrids (Co2ZrO5/g-C3N4) by hydrothermal and grinding methods. Characterization results showed that different synthesis methods have varying effects on crystal structure and morphology, leading to different photocatalytic performances. Modification of MCM-41, g-C3N4, and MWCNTs surfaces by Co2ZrO5 NPs significantly improved their photocatalytic behavior, increasing degradation efficiencies.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Nanoscience & Nanotechnology
Dajiao Cheng, Rong Liu, Limei Tian, Quan Zhou, Fushuang Niu, Yinghong Yue, Ke Hu
Summary: The study presents a photocatalytic reaction that reduces nitrobenzene to aniline, which is significant for a class of nitroaromatic prodrugs in cancer therapy. The carefully designed photocatalyst achieves high selectivity in activating nitroaromatic prodrugs.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Damian C. Onwudiwe, Olalekan C. Olatunde, Violet M. Nkwe, Youssef Ben Smida, Hela Ferjani
Summary: Weak redox potential and high recombination of charge carriers are the main limitations for photocatalysts in wastewater treatment. This study reports the synthesis of a heterostructure photocatalyst (g-C3N4/Bi2S3/CuS) with improved charge carrier separation and tuned redox potential for enhanced photocatalysis of methyl orange dye. The synthesized heterostructure showed a synergistic effect, leading to enhanced charge carrier separation and reduced recombination. The g-C3N4/Bi2S3/CuS composite exhibited higher photocatalytic efficiency compared to individual components. The highest efficiency was achieved by g-C3N4/Bi2S3/CuS(20%), which achieved 98% degradation efficiency and a reaction rate constant of 8.08 x 10(-2) min(-1). Radical scavenging experiments revealed significant roles of (OH)-O-center dot, e(-), and h(+) in the degradation process. A charge transfer scheme and reaction mechanism were proposed based on these results.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yuchun Ren, Tao Gong, Songlin Tan, Ming Chen, Fei Zhou, Yongjun Lin, Li Yang, Qiong Peng
Summary: The properties and interactions of g-C3N4, Bi3NbO7, and g-C3N4/Bi3NbO7 photocatalysts were revealed through various tests. g-C3N4/Bi3NbO7 has a lower band gap and higher absorption of visible light, as well as higher efficiency in separating photogenerated electron-hole pairs. In the photocatalytic reduction of Cr(VI), g-C3N4/Bi3NbO7 is more effective than pure g-C3N4 and Bi3NbO7.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Wu Lin, Hu Minglei, Wang Liping, Huang Shaomeng, Zhou Xiangyuan
Summary: A composite photocatalyst (TiHAP@g-C3N4) consisting of Ti doped hydroxyapatite and g-C3N4 was synthesized and showed high purity and stable photocatalytic performance.
JOURNAL OF INORGANIC MATERIALS
(2023)
Article
Chemistry, Physical
Loubna El Faroudi, Yousra El Jemli, Rkia Zari, Abdellatif Barakat, Mustafa K. Ismael, Karima Abdelouahdi, Abderrahim Solhy
Summary: The development of a soft and ecological method for synthesizing ZnO nanoparticles is an important research area in materials science and engineering. A gelation method using sodium alginate was investigated to control the size, morphology, and porosity of ZnO NPs. The optimal conditions for Orange G photodegradation using ZnO NPs were determined through a Doehlert design experiment.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Yanqi Wang, Jianrong Li, Qianqian Hu, Minting Hao, Yifan Liu, Liaokuo Gong, Renfu Li, Xiaoying Huang
Summary: The study developed a stable and highly dispersed discrete T4[Cd3In17Se31] (5-) cluster as a novel photosensitizer for photocatalytic hydrogen production. The T4 cluster-sensitized TiO2 composite exhibited dramatically improved photocatalytic activity and high stability, highlighting the great potential of metal chalcogenide clusters as high-efficiency photosensitizers for converting solar energy to chemical energy.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Organic
Nikitas G. Malliaros, Michael Orfanopoulos
Summary: An innovative and efficient method for regioselective functionalization of C-60 with 9H-fluorenes has been developed. This approach involves the use of fluorenyl radicals derived from fluorenes in a HAT process mediated by tetrabutylammoniumdecatungstate to produce [60]fullerene-fluorene dyads in a single step. Kinetic isotope effect measurements suggest a stepwise mechanism with C-H (D) bond scission as the rate-limiting step.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Yusuf Yilmaz, Mecit Ozdemir, Kayode Sanusi, Nafisat O. Fatomi, Phindile B. Khoza
Summary: The effect of aggregation on the photocatalytic behavior of two different water-soluble phthalocyanines was investigated. The results showed that ZnTCPc exhibited lower aggregation and higher degradation efficiency compared to H2TCPc in the presence of TX surfactant.
Review
Chemistry, Multidisciplinary
Qiaohong Zhu, Zehong Xu, Bocheng Qiu, Mingyang Xing, Jinlong Zhang
Summary: This review summarizes recent advances in high-performance cocatalysts based on g-C3N4 towards hydrogen evolution reaction (HER), discussing the functions, design principles, classifications, modification strategies of cocatalysts, and their intrinsic mechanisms for enhancing photocatalytic HER activity. Furthermore, the pivotal challenges and future developments of cocatalysts in the field of HER are also proposed.
Article
Engineering, Chemical
Yasmine Kadri, Ezzeddine Srasra, Imen Bekri-Abess
Summary: Hybrid composites of ZnO and PANI were prepared by cost-effective and environmentally-friendly methods, and their structure and morphology were studied. Decreasing particle size and increasing grinding time resulted in reduced photoluminescence intensity and electron-hole recombination. The percentage of PANI also influenced the photocatalytic degradation reaction.
DESALINATION AND WATER TREATMENT
(2022)
Article
Biochemistry & Molecular Biology
Brijesh Kumar Shukla, Shalu Rawat, Mayank Kumar Gautam, Hema Bhandari, Seema Garg, Jiwan Singh
Summary: In this study, Bismuth molybdate was synthesized using a simple co-precipitation procedure and characterized using various methods. The photocatalytic degradation of Orange G dye was studied using the synthesized catalyst under visible light irradiation. The optimization of process variables was done using response surface methodology, and the degradation kinetics were evaluated through modeling of experimental data. The results showed that ORG concentration and irradiation time had significant effects on the degradation.
Article
Engineering, Environmental
Yu Luo, Yuanfang Lin, Zonglin Weng, Bin Han, Yang Zhou, Xinwen Ou, Jin Jiang
Summary: By grafting thiophene (TP) onto the edge of g-C3N4, a donor-acceptor-engineered catalyst (g-C3N4-TP) is developed for efficient H2O2 production. The optimized g-C3N4-TP exhibits a significantly enhanced H2O2 production rate compared to pristine g-C3N4, attributed to the introduced TP units that promote electron-hole separation, alter O2 adsorption mode, and reduce energy barriers for H2O2 production. This work provides insights into O2 adsorption and conversion on g-C3N4 and suggests a new approach for efficient H2O2 production via rational design of donor-acceptor-engineered photocatalysts.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Moyan Li, Hongjin Liu, Shaozhi Pang, Pengwei Yan, Mingyang Liu, Minghui Ding, Bin Zhang
Summary: Alpha-Fe2O3 fusiform nanorods with a length of about 125 nm and a diameter of 50 nm were successfully synthesized via a simple hydrothermal method. These nanorods exhibited higher visible-light photocatalytic activity compared to commercial Fe2O3 nanoparticles, attributed to their unique three-dimensional structure and lower electron-hole recombination rate.
Article
Chemistry, Physical
Dimitra Makarouni, Christos Kordulis, Vassilis Dourtoglou
Summary: The study introduces a novel catalyst-solvent system that enables high-yield and large-scale production of the terpenoid manoyl oxide, with improved selectivity using a substrate-controlled methodology. The research also demonstrates the crucial role of solvents in catalysis, showing a decrease in activation energy barrier in the presence of appropriate solvents. Additionally, the acidity of the catalyst is identified as a key parameter for the process.
Article
Biochemistry & Molecular Biology
Sotiris Lycourghiotis, Eleana Kordouli, John Zafeiropoulos, Christos Kordulis, Kyriakos Bourikas
Summary: Four Ni catalysts and one Mo-Ni catalyst supported on montmorillonite were synthesized and evaluated for the production of green diesel from waste cooking oil. The addition of Mo resulted in an increase in green diesel hydrocarbons and improved carbon atom economy. The synergistic effect between Mo and Ni was attributed to the oxygen vacancies on the surface. The optimal reaction conditions were determined and the study highlights the promising use of montmorillonite as a support for efficient Ni-Mo catalysts.
Article
Chemistry, Multidisciplinary
Ioannis Nikolopoulos, George Kogkos, Vasiliki D. Tsavatopoulou, Eleana Kordouli, Kyriakos Bourikas, Christos Kordulis, Alexis Lycourghiotis
Summary: Two nickel alumina catalysts were synthesized by different methods and evaluated for their catalytic efficiency in the transformation of sunflower oil into green diesel. The catalyst prepared by co-precipitation showed higher efficiency due to its higher specific surface area and smaller nickel nanoparticle size compared to the catalyst prepared by wet impregnation. Increasing the activation temperature resulted in larger nickel nanoparticles and decreased catalytic efficiency. The optimized reaction conditions achieved complete transformation of sunflower oil and waste cooking oil into green diesel with high yield.
Article
Engineering, Chemical
Nikolaos Nikolopoulos, Eleana Kordouli, Labrini Sygellou, Kyriakos Bourikas, Christos Kordulis, Alexis Lycourghiotis
Summary: The promoting action of molybdenum species in high nickel loading Ni-ZrO2 co-precipitated catalysts was investigated. Mo addition nearly doubled the green diesel yield by accelerating the hydrodeoxygenation pathway. Increasing the activation temperature further enhanced the catalytic efficiency of the promoted catalysts, resulting in a 70.1% green diesel yield. The promoting action of molybdenum was attributed to the increase of specific surface area and the synergy between oxygen vacancies on the well-dispersed Mo-species and nickel surface sites.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Energy & Fuels
George Petropoulos, John Zafeiropoulos, Eleana Kordouli, Alexis Lycourghiotis, Christos Kordulis, Kyriakos Bourikas
Summary: The efficiency of Ni/TiO2 catalysts for renewable diesel production was evaluated. Two series of catalysts were synthesized and characterized using various physicochemical techniques. The yield towards renewable diesel was maximized over the catalyst with 50 wt.% Ni loading. The efficiency of the catalysts in green diesel production was influenced by the preparation method.
Review
Chemistry, Applied
Sotiris Lycourghiotis, Eleana Kordouli, Kyriakos Bourikas, Christos Kordulis, Alexis Lycourghiotis
Summary: This paper reviews the important contributions of metals and metal oxides as promoters in the production of green diesel using reduced nickel catalysts. The promotion effect includes accelerating green diesel production, shifting the reaction network to the dehydration pathway, reducing C-C hydrogenolysis and fragmentation of triglyceride side chains, and decreasing methanation. The promoting action is achieved through various mechanisms such as increasing the active surface of nickel, forming alloys, intermetallic compounds, and mixed oxides, as well as the synergy between nickel or Ni-Me hydrogenation sites and oxygen vacancies of the second metal oxide. The contribution of each mechanism depends on the type of promoter used.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ioannis Nikolopoulos, Eleana Kordouli, Nikolaos Mourgkogiannis, Hrissi K. Karapanagioti, Alexis Lycourghiotis, Christos Kordulis
Summary: This study aims to use biochars derived from residual biomass as supports for Ni-based catalysts. The biochars were prepared from espresso coffee residue (C) and rice husks (R) via pyrolysis, and were further treated with hot water, H3PO4 or H2SO4 solution, and NaOH solution. The obtained biochars had high surface areas and microporous structure. The most promising biochars were used as supports for Ni catalysts, and the addition of Mo significantly increased the hydrocarbon yield.
Article
Chemistry, Multidisciplinary
Konstantina Fani, Sotiris Lycourghiotis, Kyriakos Bourikas, Eleana Kordouli
Summary: In this study, activated natural mordenite was used as a support to prepare two metallic nickel catalysts for the production of green diesel from biodiesel. The optimized mordenite support exhibited enhanced surface area and pore size, ease of nickel reduction, high active surface, balanced distribution of acid sites, resistance to sintering, and low coke formation. The catalyst achieved a liquid product consisting of 94 wt.% renewable diesel after 9 hours of reaction at 350°C and 40 bar H-2 pressure under solvent-free conditions.
Article
Chemistry, Multidisciplinary
Dimitra Makarouni, Chara Dimitriadi Evgenidi, Christos Kordulis, Vassilios Dourtoglou
Summary: In this study, the mordenite catalyst TECH NOSA-H2 from Greek volcanic soils was used for synthesizing ethers and acetals from renewable materials. The yields of di-furfuryl ether and furfuryl ethyl ether achieved with TECH NOSA-H2 were 30% and 60% respectively, in 3 hours at 150°C. The catalyst also demonstrated high efficiency in synthesizing citral propylene glycol acetal and citral diethyl acetal, with 50% yields obtained in 20 minutes at mild temperatures. The active sites of TECH NOSA-H2 were found to be dominated by Bronsted acidity.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Article
Chemistry, Applied
George Petropoulos, John Zafeiropoulos, Eleana Kordouli, Labrini Sygellou, Christos Kordulis, Alexis Lycourghiotis, Kyriakos Bourikas
Summary: Research was conducted on reduced NiMo catalysts supported on titania for the transformation of vegetable oils to green diesel. The catalysts were prepared using the deposition-precipitation method and characterized by various techniques. The optimal catalyst formulation had a synergistic [Ni/(Ni+Mo)] atomic ratio of 0.99 and achieved high conversion yields of 65±2% for various crude oils.
Article
Chemistry, Inorganic & Nuclear
Theocharis Kentri, Antonios Trimpalis, Adam Misa, Eleana Kordouli, Theodora Ramantani, Soghomon Boghosian
Summary: The structural properties of the (WOx)(n) phase dispersed on TiO2 were studied using in situ Raman and FTIR spectroscopy. The results showed that the dispersion and coverage of the (WOx)(n) phase were temperature and coverage dependent, and the transformations were reversible.
DALTON TRANSACTIONS
(2022)