keyword
https://read.qxmd.com/read/35536466/phycocyanin-from-spirulina-platensis-bio-mimics-quantum-dots-photocatalytic-activity-a-novel-approach-for-dye-degradation
#21
JOURNAL ARTICLE
Sharmila Jeyaraja, Saravanan Palanivel, Kowsalya Palanimuthu, Chamundeeswari Munusamy
In our present study, the photocatalytic degradation of malachite green (MG) an organic dye was carried out using a phycocyanin extract of Spirulina platensis under the irradiation of sunlight. The aim of the present study is to incorporate a simple, novel, an eco-friendly, and cost-effective degradation of dyes without using any harmful metals and chemicals. It was observed that 25 ppm of MG dye got degraded nearly to 100 % at 3 h. The UV absorbance studies indicate the absence of a peak at 620 nm which is a conclusive evidence for MG dye degradation...
May 10, 2022: Environmental Science and Pollution Research International
https://read.qxmd.com/read/34984623/interfacial-coupling-effects-on-adsorptive-and-photocatalytic-performances-for-photoresponsive-graphene-wrapped-srtio-3-ag-under-uv-visible-light-experimental-and-dft-approach
#22
JOURNAL ARTICLE
Mohamed Khalil Guediri, Derradji Chebli, Abdallah Bouguettoucha, Riadh Bourzami, Abdeltif Amrane
Understanding the graphene/semiconductor/metal interactions is crucial to design innovative photocatalytic materials with efficient photocatalytic activity for environmental cleanup applications. SrTiO3 on reduced graphene oxide (rGO) with various graphene contents was successfully synthesized in this study utilizing a simple hydrothermal method, followed by decorating the surface with Ag particles by using the photodeposition process. Under UV-visible light irradiation, the resulting composites were tested for their improved photocatalytic activity to decompose methylene blue (MB)...
April 2022: Environmental Science and Pollution Research International
https://read.qxmd.com/read/34918718/mechanistic-understanding-of-the-increased-photoactivity-of-tio-2-nanosheets-upon-tantalum-doping
#23
JOURNAL ARTICLE
Hanggara Sudrajat, Sri Hartuti, Sandhya Babel
Anatase TiO2 is doped with Ta cations through a hydrothermal route. Based on X-ray photoelectron spectroscopy and X-ray absorption near-edge structure spectroscopy, the Ta dopants exist in the 5+-oxidation state. The oxidation state is insensitive to the Ta loading amount. Extended X-ray absorption fine structure spectroscopy confirms that the local structure around Ta cations is not identical between the Ta-doped samples. The Ta-O distance monotonically increases with the Ta loading amount due to a gradually expanding lattice...
January 4, 2022: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/34893262/in-situ-grown-bacterial-cellulose-mos-2-composites-for-multi-contaminant-wastewater-treatment-and-bacteria-inactivation
#24
JOURNAL ARTICLE
Huiying Shen, Shiqin Liao, Chenyu Jiang, Jiawen Zhang, Qufu Wei, Reza A Ghiladi, Qingqing Wang
For the purpose of developing multifunctional water purification materials capable of degrading organic pollutants while simultaneously inactivating microorganisms from contaminated wastewater streams, we report here a facile and eco-friendly method to immobilize molybdenum disulfide into bacterial cellulose via a one-step in-situ biosynthetic method. The resultant nanocomposite, termed BC/MoS2 , was shown to possess a photocatalytic activity capable of generating •OH from H2 O2 , while also exhibiting photodynamic/photothermal mechanisms, the combination of which exhibits synergistic activity for the degradation of pollutants as well as for bacterial inactivation...
February 1, 2022: Carbohydrate Polymers
https://read.qxmd.com/read/34835610/uniform-fabrication-of-hollow-titania-using-anionic-modified-acrylated-polymer-template-for-phase-composition-effect-as-photocatalyst-and-infrared-reflective-coating
#25
JOURNAL ARTICLE
Tae Ho Yun, Changyong Yim
Polymer coatings containing thermal blocking and near-infrared (NIR)-reflective pigments have received much attention for their potential applications in energy-saving fields. A drawback of these coatings is sustainability providing similar long-term performance. Surface cleaning is mandatory to remove contaminants that decrease reflectance. In this study, synthesized hollow titania as photocatalyst was used to impart anti-contamination to infrared (IR)-reflective coatings. A TiO2 shell was selectively formed on an anionic polystyrene core, modified by methacrylic acid...
October 26, 2021: Nanomaterials
https://read.qxmd.com/read/34753124/upconversion-lanthanide-nanomaterials-basics-introduction-synthesis-approaches-mechanism-and-application-in-photodetector-and-photovoltaic-devices
#26
REVIEW
Baharak Mehrdel, Ali Nikbakht, Azlan Abdul Aziz, Mahmood S Jameel, Mohammed Ali Dheyab, Pegah Moradi Khaniabadi
Upconversion (UC) of lanthanide-doped nanostructure has the unique ability to convert low energy infrared (IR) light to high energy photons, which has significant potential for energy conversion applications. This review concisely discusses the basic concepts and fundamental theories of lanthanide nanostructures, synthesis techniques, and enhancement methods of upconversion for photovoltaic and for near-infrared (NIR) photodetector (PD) application. In addition, a few examples of lanthanide-doped nanostructures with improved performance were discussed, with particular emphasis on upconversion emission enhancement using coupling plasmon...
November 29, 2021: Nanotechnology
https://read.qxmd.com/read/34748802/strategies-based-review-on-near-infrared-light-driven-bismuth-nanocomposites-for-environmental-pollutants-degradation
#27
REVIEW
Anita Sudhaik, Aftab Aslam Parwaz Khan, Pankaj Raizada, Van-Huy Nguyen, Quyet Van Le, Abdullah M Asiri, Pardeep Singh
Recently, solar energy has been considered the most vulnerable source to resolve environmental pollution and energy scarcity problems. Researchers have made intense research efforts to convert solar energy into chemical energy through photocatalysis processes as it is a green, clean and renewable energy source. Numerous discovered photocatalysts show absorption in the ultraviolet-visible (UV∼5% and visible ∼43%) region and are devoid of near-infrared (NIR ∼52%) light utilization. As infrared (IR) light contains a top portion of the solar spectrum; therefore, many alluring and attractive practical strategies have been explored to improve photocatalytic reactions and to harness full solar spectrum (including NIR light)...
March 2022: Chemosphere
https://read.qxmd.com/read/34608804/photodriven-catalytic-hydrogenation-of-co-2-to-ch-4-with-nearly-100-selectivity-over-ag-25-clusters
#28
JOURNAL ARTICLE
Yan Xiong, Hongwei Chen, Yi Hu, Songyuan Yang, Xiaolan Xue, Lingfeng He, Xu Liu, Jing Ma, Zhong Jin
The conversion of chemically inert carbon dioxide and its photoreduction to value-added products have attracted enormous attention as an intriguing prospect for utilizing the principal greenhouse gas CO2 . Herein, we explore the use of Ag25 clusters with well-defined atomic structures for high-selectivity photocatalytic hydrogenation of CO2 to methane. Ag25 clusters, with molecular-like properties and surface plasmon resonance, exhibit competitive catalytic activity for light-driven CO2 reduction that yield an almost 100% product selectivity of methane at a relatively mild temperature (100 °C)...
October 5, 2021: Nano Letters
https://read.qxmd.com/read/34537646/encapsulation-of-spinel-cuco-2-o-4-hollow-sphere-in-v-2-o-5-decorated-graphitic-carbon-nitride-as-high-efficiency-double-z-type-nanocomposite-for-levofloxacin-photodegradation
#29
JOURNAL ARTICLE
Farzad Hasanvandian, Ali Shokri, Mohsen Moradi, Babak Kakavandi, Shahrbanoo Rahman Setayesh
In this study, spinel CuCo2 O4 (CCO) with a hierarchical hollow sphere morphology was encapsulated in V2 O5 -decorated ultra-wrinkled graphitic carbon-nitride (VO-UCN) for the first time via a facile glycerol-assisted solvothermal method in the interest of developing a novel high-efficiency double Z-type nano-photocatalyst (denoted as VO-UCN@CCO). The remarkable physicochemical features of the as-prepared nano-photocatalysts were verified using diverse characterization techniques including TGA, XRD, FT-IR, FE-SEM, TEM, BET, UV-vis DRS, PL, EIS, and transient photocurrent techniques...
February 5, 2022: Journal of Hazardous Materials
https://read.qxmd.com/read/34333311/photocatalytic-degradation-of-cyanide-using-polyurethane-foam-immobilized-fe-tcpp-s-tio-2-rgo-nano-composite
#30
JOURNAL ARTICLE
Dhruti Sundar Pattanayak, Jyoti Mishra, Jyotirmayee Nanda, Prasanta Kumar Sahoo, Rahul Kumar, Naresh Kumar Sahoo
An attempt has been made for the treatment of cyanide contaminated wastewater using a S-TiO2 @rGO heterogeneous photocatalyst system immobilized on polyurethane foam (PUF) supporting materials. Further, to make the photocatalytic system more efficient and active under visible light, a highly efficient iron porphyrin derivative sensitizer viz. Fe-TCPP was synthesized and employed for cyanide degradation. To investigate the synthesized heterogeneous nano-composite S-TiO2 @rGO-FeTCPP photocatalytic system, advanced techniques such as XRD, XPS, FT-IR, PL spectra, UV-vis DRS, FESEM, and EDS were utilized...
November 1, 2021: Journal of Environmental Management
https://read.qxmd.com/read/34332408/oxygen-vacancy-bio-2-x-bi-2-wo-6-synchronous-coupling-with-bi-metal-for-phenol-removal-via-visible-and-near-infrared-light-irradiation
#31
JOURNAL ARTICLE
Jiafeng Jin, Jinsheng Sun, Kaihe Lv, Xuan Guo, Qilin Hou, Jingping Liu, Jintang Wang, Yingrui Bai, Xianbin Huang
The introduction of oxygen-defects has been a versatile strategy to enhance photocatalysis efficiency. In this work, a 2D/3D Bi/BiO2-x /Bi2 WO6 heterojunction photocatalyst with rich oxygen-defective was in sequence prepared through a facile solvothermal method, which displays favorable photocatalytic activity towards organic contaminants under visible-NIR light irradiation. The enhancement in photocatalytic performance can be attributed to the synergistic effect between oxygen-vacancy-rich heterojunction and the localized surface plasmon resonance induced by metallic Bi...
January 2022: Journal of Colloid and Interface Science
https://read.qxmd.com/read/34241368/zeolitic-imidazolate-frameworks-as-intrinsic-light-harvesting-and-charge-separation-materials-for-photocatalysis
#32
JOURNAL ARTICLE
Wenhui Hu, Brian Pattengale, Jier Huang
Zeolitic imidazolate frameworks (ZIFs) are a subclass of metal organic frameworks that have attracted considerable attention in the past years and have found many applications including heterogeneous catalysis due to their highly ordered porous structure, large surface area, and structural flexibility. However, ZIFs are largely utilized as simple hosts or passive media for dispersing other catalytically active species, resembling the roles of zeolites in catalysis. In contrast, our recent findings show that ZIFs not only have broad absorption across the UV-visible and near IR spectral region but also have an exceptionally long-lived excited charge separated state, suggesting that ZIFs may be used as intrinsic light harvesting and photocatalytic materials rather than as inert hosts...
June 28, 2021: Journal of Chemical Physics
https://read.qxmd.com/read/34191486/mechanistic-investigation-and-optimization-of-photoredox-anti-markovnikov-hydroamination
#33
JOURNAL ARTICLE
Yangzhong Qin, Qilei Zhu, Rui Sun, Jacob M Ganley, Robert R Knowles, Daniel G Nocera
The reaction mechanism and the origin of the selectivity for the photocatalytic intermolecular anti-Markovnikov hydroamination of unactivated alkenes with primary amines to furnish secondary amines have been revealed by time-resolved laser kinetics measurements of the key reaction intermediates. We show that back-electron transfer (BET) between the photogenerated aminium radical cation (ARC) and reduced photocatalyst complex (Ir(II)) is nearly absent due to rapid deprotonation of the ARC on the sub-100 ns time scale...
June 30, 2021: Journal of the American Chemical Society
https://read.qxmd.com/read/33976220/metal-organic-framework-membranes-with-single-atomic-centers-for-photocatalytic-co-2-and-o-2-reduction
#34
JOURNAL ARTICLE
Yu-Chen Hao, Li-Wei Chen, Jiani Li, Yu Guo, Xin Su, Miao Shu, Qinghua Zhang, Wen-Yan Gao, Siwu Li, Zi-Long Yu, Lin Gu, Xiao Feng, An-Xiang Yin, Rui Si, Ya-Wen Zhang, Bo Wang, Chun-Hua Yan
The demand for sustainable energy has motivated the development of artificial photosynthesis. Yet the catalyst and reaction interface designs for directly fixing permanent gases (e.g. CO2 , O2 , N2 ) into liquid fuels are still challenged by slow mass transfer and sluggish catalytic kinetics at the gas-liquid-solid boundary. Here, we report that gas-permeable metal-organic framework (MOF) membranes can modify the electronic structures and catalytic properties of metal single-atoms (SAs) to promote the diffusion, activation, and reduction of gas molecules (e...
May 11, 2021: Nature Communications
https://read.qxmd.com/read/33316515/an-afm-ir-study-on-surface-properties-of-nano-tio-2-coated-polyethylene-pe-thin-film-as-influenced-by-photocatalytic-aging-process
#35
JOURNAL ARTICLE
Hongwei Luo, Yahui Xiang, Tian Tian, Xiangliang Pan
Most plastic wastes undergo extensive photo-aging in the environment, and the aged plastics exhibit different surface properties from pristine ones. Here, we investigate the surface properties of a nano-TiO2 coated polyethylene (PE) film as influenced by photocatalytic aging process using an atomic force microscopy coupled with infrared spectroscopy (AFM-IR) technique. Results showed that the height range of the as-prepared samples was about 30 nm, and the equivalent diameter of nano-TiO2 was ~70 nm. The photo-induced oxidation of the CH2 bond occurred on the surface of the PE film...
December 3, 2020: Science of the Total Environment
https://read.qxmd.com/read/33305778/graphitic-carbon-nitrides-as-platforms-for-single-atom-photocatalysis
#36
JOURNAL ARTICLE
Felippe M Colombari, Marcos A R da Silva, Mauricio S Homsi, Beatriz R L de Souza, Milenny Araujo, Juliana L Francisco, Gelson T S T da Silva, Ingrid F Silva, André F de Moura, Ivo F Teixeira
Herein we demonstrate that adding single atoms of selected transition metals to graphitic carbon nitrides allows the tailoring of the electronic and chemical properties of these 2D nanomaterials, directly impacting their usage in photocatalysis. These single-atom photocatalysts were successfully prepared with Ni2+, Pt2+ or Ru3+ by cation exchange, using poly(heptazine imides) (PHI) as the 2D layered platform. Differences in photocatalytic performance for these metals were assessed using rhodamine-B (RhB) and methyl orange (MO) as model compounds for degradation...
December 11, 2020: Faraday Discussions
https://read.qxmd.com/read/33280917/exploring-the-influence-of-varying-ph-on-structural-electro-optical-magnetic-and-photo-fenton-properties-of-mesoporous-znfe-2-o-4-nanocrystals
#37
JOURNAL ARTICLE
P Annie Vinosha, A Manikandan, R Ragu, A Dinesh, P Paulraj, Y Slimani, M A Almessiere, A Baykal, J Madhavan, Belina Xavier, G Francisco Nirmala
An economically viable and superficial technique was indorsed to yield ZnFe2 O4 nanocrystals in the system to investigate the impact of pH variation on the optical, structural, electrical, and magnetic properties of as-prepared nanocrystals. The as-synthesized ZnFe2 O4 nanocrystals were premeditated with the application protracted to degradation of Methylene blue organic dye. The results specify that the pH plays the utmost decisive facet in photo-Fenton recital. From XRD (X-Ray diffraction) analyses, it was confirmed that as-synthesized nanocrystals belong to a cubic Fd3m crystal phase...
March 1, 2021: Environmental Pollution
https://read.qxmd.com/read/33050364/morphology-surface-structure-and-water-adsorption-properties-of-tio-2-nanoparticles-a-comparison-of-different-commercial-samples
#38
JOURNAL ARTICLE
Lorenzo Mino, Chiara Negri, Rosangela Santalucia, Giuseppina Cerrato, Giuseppe Spoto, Gianmario Martra
Water is a molecule always present in the reaction environment in photocatalytic and biomedical applications of TiO2 and a better understanding of its interaction with the surface of TiO2 nanoparticles is crucial to develop materials with improved performance. In this contribution, we first studied the nature and the surface structure of the exposed facets of three commercial TiO2 samples (i.e., TiO2 P25, SX001, and PC105) by electron microscopy and IR spectroscopy of adsorbed CO. The morphological information was then correlated with the water adsorption properties, investigated at the molecular level, moving from multilayers of adsorbed H2 O to the monolayer, combining medium- and near-IR spectroscopies...
October 10, 2020: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/32939926/plasmonic-hot-electrons-from-oxygen-vacancies-for-infrared-light-driven-catalytic-co2-reduction-on-bi2o3-x
#39
JOURNAL ARTICLE
Yingxuan Li, Miaomiao Wen, Ying Wang, Guang Tian, Chuanyi Wang, Jincai Zhao
Current plasmonic photocatalysts are mainly based on noble metal nanoparticles and rarely work in the infrared (IR) light range. Here, cost-effective Bi 2 O 3- x with oxygen vacancies was formed in situ on commercial bismuth powder by calcination at 453.15 K in atmosphere. Interestingly, defects introduced into Bi 2 O 3- x simultaneously induced a localized surface plasmon resonance (LSPR) in the wavelength range of 600-1400 nm and enhanced the adsorption for CO 2 molecules, which enabled efficient photocatalysis of CO 2 -to-CO (~100% selectivity) even under low-intensity near-IR light irradiation...
September 16, 2020: Angewandte Chemie
https://read.qxmd.com/read/32909754/living-long-and-prosperous-productive-intraligand-charge-transfer-states-from-a-rhenium-i-terpyridine-photosensitizer-with-enhanced-light-absorption
#40
JOURNAL ARTICLE
Ricardo Fernández-Terán, Laurent Sévery
The ground- and excited-state properties of six rhenium(I) κ2 N -tricarbonyl complexes with 4'-(4-substituted-phenyl)terpyridine ligands bearing substituents of different electron-donating abilities were evaluated. Significant modulation of the electrochemical potentials and a nearly 4-fold variation of the triplet metal-to-ligand charge-transfer (3 MLCT) lifetimes were observed upon going from CN to OMe. With the more electron-donating NMe2 group, we observed in the κ2 N complex the appearance of a very strong absorption band, red-shifted by ca...
September 10, 2020: Inorganic Chemistry
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