☆ 4.7 Article

Synthesis of Bi25FeO40 Nanoparticles with Oxygen Vacancies via Ball Milling for Fenton Oxidation of Tetracycline Hydrochloride and Reduction of Cr(VI)

ACS APPLIED NANO MATERIALS (2023)

相关参考文献

注意：仅列出部分参考文献，下载原文获取全部文献信息。

Article Chemistry, Physical

Porous edge confinement: High carrier potential and low activation energy barrier synergistically boosting the efficiency of selective photocatalytic CO2 conversion

Bin Wang et al.

Summary: 2D BiOCl porous nanosheets (BOC-PNS), prepared by triblock polymer (F127) assisted mechanical ball milling, possess a (001) main exposed plane and a porous structure increasing the edge (110) facet. The (001)/(110) heterojunction enhances directional migration and separation of photogenerated carriers. Under simulated sunlight, the CO yield of BOC-PNS is significantly enhanced by the rich edge confinement effect, reaching 28.2 μmol g-1 h-1, which is 2.1 and 2.8 times that of BOC nanosheets (13.5 μmol g-1 h-1) and nanoplates (9.9 μmol g-1 h-1), respectively.

APPLIED CATALYSIS B-ENVIRONMENTAL (2023)

添加到收藏夹

Article Engineering, Electrical & Electronic

Influence of PVP on Bi25FeO40 microcubes for Supercapacitors and Dye-Sensitized Solar Cells applications

A. Muthu Kumar et al.

Summary: PVP-assisted Bi25FeO40 microcubes were synthesized via the hydrothermal technique to investigate the effect of morphology on electrochemical energy storage and conversion. The results showed that Bi25FeO40 is a promising material for supercapacitors and can also serve as a counter electrode in Dye-Sensitized Solar Cells.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS (2022)

添加到收藏夹

Article Chemistry, Multidisciplinary

Small amount for multiple times of H2O2 feeding way in MoS2-Fex heterogeneous fenton for enhancing sulfadiazine degradation

Zhuan Chen et al.

Summary: In this study, a new type of composite catalyst (MoS2-Fe-x) was developed, and the effect of H2O2 feeding way on the Fenton process was investigated. The results showed that supplying H2O2 in small amounts multiple times increased the degradation rate of sulfadiazine and reduced the decomposition side reaction of H2O2.

CHINESE CHEMICAL LETTERS (2022)

添加到收藏夹

Article Chemistry, Physical

Novel porous Mn-Fe nanocubes toward peroxymonosulfate activation via non-radical/radical pathways for emerging contaminants degradation

Li Li et al.

Summary: Novel porous Mn-Fe nanocubes with abundant oxygen vacancies were synthesized through annealing at H-2 atmosphere for the first time. They exhibited excellent performance for the degradation of bisphenol A and the possible degradation pathways were proposed.

APPLIED SURFACE SCIENCE (2022)

添加到收藏夹

Article Environmental Sciences

Removal of hexavalent chromium from water by Z-scheme photocatalysis using TiO2 (rutile) nanorods loaded with Au core-Cu2O shell particles

Sayaka Yanagida et al.

Summary: Cu2O-Au-TiO2 composites, prepared by loading Au core-Cu2O shell particles on TiO2 nanorods, exhibited higher photocatalytic Cr(VI) reduction activities under UV-vis light illumination compared to single TiO2 and Cu2O. The reduction site of the composite was Cu2O, and the reaction followed the Z-scheme. The composite also showed photocatalytic activity under visible light illumination, and the oxidation state of Cu changed during the photocatalytic reaction without affecting its performance.

JOURNAL OF ENVIRONMENTAL SCIENCES (2022)

添加到收藏夹

Article Chemistry, Physical

Promoting photo-Fenton catalytic performance of MnFeO3-type perovskite via creation of type-II heterojunction with superior charge separator boron nitride quantum dots

Zeynep Balta et al.

Summary: In this study, boron nitride quantum dots were successfully embedded on ferrite-type perovskite MnFeO3 structure to generate MFO/BNQDs heterojunctions. The presence of BNQDs enhanced the optical properties of MFO, facilitated charge carrier separation and transfer, and improved catalytic performance against tetracycline hydrochloride antibiotic.

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY (2022)

添加到收藏夹

Article Chemistry, Multidisciplinary

Excited Electron-Rich Bi(3-x)+ Sites: A Quantum Well-Like Structure for Highly-Promoted Selective Photocatalytic CO2 Reduction Performance

Bin Wang et al.

Summary: This study reveals the important roles of oxygen vacancies and bimetallic oxyhalides structure in photocatalytic reactions through various experimental methods and theoretical calculations. The results indicate that the formation of excited Bi(3-x)+ sites can enhance the transfer efficiency of photogenerated electrons and reduce the energy barrier, thus improving the rate and efficiency of photocatalytic reactions.

ADVANCED FUNCTIONAL MATERIALS (2022)

添加到收藏夹

Article Chemistry, Multidisciplinary

Generating High-valent Iron-oxo ≡FeIV=O Complexes in Neutral Microenvironments through Peroxymonosulfate Activation by Zn-Fe Layered Double Hydroxides

Yan Bao et al.

Summary: In this study, we propose the construction of a neutral microenvironment on the surface of Zn-Fe layered double hydroxide for activating PMS. By utilizing the amphoteric properties of zinc hydroxide, equivalent to Fe-IV=O can be continuously generated over a wide pH range. The neutral microenvironment mitigates the self-decomposition of Fe-IV=O and the hydrolysis reaction of iron, resulting in stable and efficient treatment of wastewater.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

添加到收藏夹

Article Engineering, Environmental

A Cu/CuFe2O4-OVs two-electron centre-based synergistic photocatalysis-Fenton system for efficient degradation of organic pollutants

Shuyao Wang et al.

Summary: By preparing a Cu/CuFe2O4 catalyst with oxygen vacancies and a photocatalysis-Fenton degradation system, efficient degradation of organic pollutants can be achieved. The degradation activity of this system is superior to traditional photocatalysis and Fenton oxidation methods.

CHEMICAL ENGINEERING JOURNAL (2022)

添加到收藏夹

Article Chemistry, Inorganic & Nuclear

Fabrication of Two Isomorphic and Hyperstable Rare Earth-Based Metal-Organic Frameworks with Efficient Ratiometric Probe and Photocatalytic Performances

Geng Tan et al.

Summary: Two isomorphic lanthanide compounds {[Ln(ddpp)(H2O)]middotCH(3)CN}(n) (Ln = Eu and Gd, H(4)ddpp = 2,5-di(2 ',4 '-dicarboxylphenyl)pyridine) were synthesized and their properties and applications were investigated. Complex 1-Eu showed high stability and sensitivity in detecting quinolone antibiotics. Complex 1-Gd exhibited excellent tetracycline degradation properties under visible light. The behaviors of these two compounds were explained through experimental and computational studies.

INORGANIC CHEMISTRY (2022)

添加到收藏夹

Article Chemistry, Analytical

Fabrication of sensitive photoelectrochemical aptasensor using Ag nanoparticles sensitized bismuth oxyiodide for determination of chloramphenicol

Jintao Dong et al.

Summary: A highly sensitive and selective photoelectrochemical aptasensor was developed for detecting trace chloramphenicol. The aptasensor, based on Ag nanoparticles sensitized bismuth oxyiodide composites, showed enhanced CAP detection performance with wide linear range, low detection limit, and superior selectivity. Moreover, the aptasensor exhibited favorable stability and reproducibility.

MICROCHEMICAL JOURNAL (2022)

添加到收藏夹

Article Nanoscience & Nanotechnology

FeOCl Nanoparticles Loaded onto Oxygen-Enriched Carbon Nanotubes and Nickel-Foam-Based Cathodes for the Electro-Fenton Degradation of Pollutants

Shuang Zhong et al.

Summary: The electrochemical advanced oxidation processes (EAOPs) are a class of technologies that hold promise for wastewater remediation. In this study, a novel EAOP system was developed using a FeOCl/O-CNTs/NF cathode and an IrO2/Ti anode, which enabled simultaneous electro-Fenton and anodic oxidation reactions. The FeOCl/O-CNTs/NF cathode exhibited high H2O2 production rate and excellent catalytic performance, resulting in efficient and cost-effective organic contaminant remediation.

ACS APPLIED NANO MATERIALS (2022)

添加到收藏夹

Article Chemistry, Multidisciplinary

Molecular Engineering toward Pyrrolic N-Rich M-N4 (M = Cr, Mn, Fe, Co, Cu) Single-Atom Sites for Enhanced Heterogeneous Fenton-Like Reaction

Feng Chen et al.

Summary: A novel transition metal single-atom catalyst has been developed for efficient heterogeneous Fenton-like reactions, showing excellent cyclic stability and a wide effective pH range. The catalyst accelerates the production and separation of charge carriers, enhancing the reaction performance.

ADVANCED FUNCTIONAL MATERIALS (2021)

添加到收藏夹

Article Chemistry, Physical

Oxygen vacancies in Bi2Sn2O7 quantum dots to trigger efficient photocatalytic nitrogen reduction

Yi Zhang et al.

Summary: By constructing Bi2Sn2O7 quantum dots using a solvothermal method, the energy band structure and surface active sites were optimized, leading to efficient photocatalytic nitrogen fixation behavior.

APPLIED CATALYSIS B-ENVIRONMENTAL (2021)

添加到收藏夹

Article Chemistry, Physical

High-efficiency photo-Fenton Fe/g-C3N4/kaolinite catalyst for tetracycline hydrochloride degradation

Zhou Cao et al.

Summary: A Fe/graphitic carbon nitride/kaolinite composite photocatalyst was successfully prepared for the first time and showed high degradation efficiency for TCH in the photo-Fenton system. Free radical scavenging experiments confirmed that hydroxyl radicals were the main active substances. The enhanced photocatalytic activity of the composite can be attributed to the large specific surface area of kaolinite and Fe acting as a photo-generated electron acceptor.

APPLIED CLAY SCIENCE (2021)

添加到收藏夹

Article Chemistry, Physical

Regulating activation pathway of Cu/persulfate through the incorporation of unreducible metal oxides: Pivotal role of surface oxygen vacancies

Xinquan Zhou et al.

Summary: The study found that incorporating unreducible metal oxides into CuO hybrid magnetic nano ferric oxide can alter the reaction pathway and increase the reaction rate in persulfate activation. In the CuM@Fe3O4/PMS system, O-1(2) dominates the nonradical oxidation process, indicating the importance of singlet oxygen in the system.

APPLIED CATALYSIS B-ENVIRONMENTAL (2021)

添加到收藏夹

Article Chemistry, Inorganic & Nuclear

Construction of MOF/COF Hybrids for Boosting Sunlight-Induced Fenton-like Photocatalytic Removal of Organic Pollutants

Xiandi Guo et al.

Summary: By hybridizing NH2-MIL88B metal-organic framework (MOF) material with TpPa-1-COF through covalent bonding and utilizing Fenton-like excitation of H2O2, the photocatalytic activity of the hybrid was significantly enhanced compared to its parent MOF and covalent organic framework (COF). This research demonstrates a facile approach to improving the photocatalytic property of MOF materials by forming hybrids with COFs and utilizing Fenton-like excitation of H2O2.

INORGANIC CHEMISTRY (2021)

添加到收藏夹

Article Chemistry, Physical

Oxalate enhanced synergistic removal of chromium(VI) and arsenic(III) over ZnFe2O4/g-C3N4: Z-scheme charge transfer pathway and photo-Fenton like reaction

Dashi Lei et al.

Summary: The direct Z-Scheme photocatalyst was used to purify Cr(VI) and As(III) in wastewater effectively, showing complete removal within a wide pH range. During the photo reaction, the generation of Fe(II) and center dot CO2- played a crucial role in the formation of hydroxyl and superoxide radicals.

APPLIED CATALYSIS B-ENVIRONMENTAL (2021)

添加到收藏夹

Article Chemistry, Physical

Electrocatalytic performance of Sb-modified Bi25FeO40 for nitrogen fixation

Yu Zhang et al.

Summary: The electrochemical conversion of N-2 (NRR) using the Sb-modified Bi25FeO40 (BFSO/BFO) catalyst shows higher selectivity and significant electrocatalytic activity, providing new insight into the design of composite catalysts for NRR with high activity and selectivity.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2021)

添加到收藏夹

Article Chemistry, Physical

Hollow and porous NiCo2O4 nanospheres for enhanced methanol oxidation reaction and oxygen reduction reaction by oxygen vacancies engineering

Shuai Chen et al.

Summary: Controllable hollow NiCo2O4 nanoparticles with interconnected hierarchically porous structure and abundant oxygen vacancies were successfully constructed via a simple template-free solvothermal method and heat treatment. These hollow and porous NiCo2O4 nanoparticles exhibit outstanding performance in various electrochemical reactions, showcasing potential applications in fuel cells.

APPLIED CATALYSIS B-ENVIRONMENTAL (2021)

添加到收藏夹

Article Nanoscience & Nanotechnology

Direct Z-Scheme Heterostructures Based on MoSSe Quantum Dots for Visible Light-Driven Photocatalytic Tetracycline Degradation

Linjer Chen et al.

Summary: Z-scheme MoSSe quantum dots synthesized through a hydrothermal process exhibit enhanced photodegradation efficiency for tetracycline under visible light irradiation. The photodegradation rate of MoSSe QDs is found to be 5.26-6.25 times faster than that of bulk components, indicating their potential for environmental wastewater pollutant treatment.

ACS APPLIED NANO MATERIALS (2021)

添加到收藏夹

Article Engineering, Environmental

Immobilization of iron phthalocyanine on 4-aminopyridine grafted polystyrene resin as a catalyst for peroxymonosulfate activation in eliminating tetracycline hydrochloride

Yue Sun et al.

CHEMICAL ENGINEERING JOURNAL (2020)

添加到收藏夹

Article Chemistry, Physical

Critical role of oxygen vacancies in heterogeneous Fenton oxidation over ceria-based catalysts

Nuanqin Zhang et al.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2020)

添加到收藏夹

Article Engineering, Environmental

MoS2 nanosheets anchored on porous ZnSnO3 cubes as an efficient visible-light-driven composite photocatalyst for the degradation of tetracycline and mechanism insight

Feng Guo et al.

JOURNAL OF HAZARDOUS MATERIALS (2020)

添加到收藏夹

Article Nanoscience & Nanotechnology

Direct Z-Scheme 0D/2D Heterojunction of CsPbBr3 Quantum Dots/Bi2WO6 Nanosheets for Efficient Photocatalytic CO2 Reduction

Jichong Wang et al.

ACS APPLIED MATERIALS & INTERFACES (2020)

添加到收藏夹

Article Engineering, Environmental

Simultaneous reduction of Cr(VI) and degradation of tetracycline hydrochloride by a novel iron-modified rectorite composite through heterogeneous photo-Fenton processes

Sheng Guo et al.

CHEMICAL ENGINEERING JOURNAL (2020)

添加到收藏夹

Article Engineering, Environmental

Construction of CuBi2O4/Bi2MoO6 p-n heterojunction with nanosheets-on- microrods structure for improved photocatalytic activity towards broad- spectrum antibiotics degradation

Weilong Shi et al.

CHEMICAL ENGINEERING JOURNAL (2020)

添加到收藏夹

Article Chemistry, Physical

Novel magnetic rod-like Mn-Fe oxycarbide toward peroxymonosulfate activation for efficient oxidation of butyl paraben: Radical oxidation versus singlet oxygenation

Jia-Cheng E. Yang et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2020)

添加到收藏夹

Article Engineering, Environmental

Enhanced photocatalytic tetracycline degradation using N-CQDs/OV-BiOBr composites: Unraveling the complementary effects between N-CQDs and oxygen vacancy

Hanbo Yu et al.

CHEMICAL ENGINEERING JOURNAL (2020)

添加到收藏夹

Article Chemistry, Inorganic & Nuclear

Magnetite/Iron Foil as an Effective and Nonfiltration Catalyst for Heterogeneous Fenton-like Reactions under Neutral Conditions

Xiaoyi Wang et al.

INORGANIC CHEMISTRY (2019)

添加到收藏夹

Article Multidisciplinary Sciences

Promoting ring-opening efficiency for suppressing toxic intermediates during photocatalytic toluene degradation via surface oxygen vacancies

Xing'an Dong et al.

SCIENCE BULLETIN (2019)

添加到收藏夹

Article Environmental Sciences

3D Bombax-structured carbon nanotube sponge coupling with Ag3PO4 for tetracycline degradation under ultrasound and visible light irradiation

Jiafeng Jin et al.

SCIENCE OF THE TOTAL ENVIRONMENT (2019)

添加到收藏夹

Article Nanoscience & Nanotechnology

Lattice-Refined Transition-Metal Oxides via Ball Milling for Boosted Catalytic Oxidation Performance

Jing He et al.

ACS APPLIED MATERIALS & INTERFACES (2019)

添加到收藏夹

Article Engineering, Environmental

Singlet Oxygen Triggered by Superoxide Radicals in a Molybdenum Cocatalytic Fenton Reaction with Enhanced REDOX Activity in the Environment

Quying Yi et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2019)

添加到收藏夹

Article Chemistry, Physical

Spinel-type NiCo2O4 with abundant oxygen vacancies as a high-performance catalyst for the oxygen reduction reaction

Dongwook Lim et al.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2019)

添加到收藏夹

Article Environmental Sciences

Novel flexible Fenton-like catalyst: Unique CuO nanowires arrays on copper mesh with high efficiency across a wide pH range

Zhen Su et al.

SCIENCE OF THE TOTAL ENVIRONMENT (2019)

添加到收藏夹

Article Engineering, Environmental

Heterogeneous activation of peroxymonosulfate by sillenite Bi25FeO40: Singlet oxygen generation and degradation for aquatic levofloxacin

Yang Liu et al.

CHEMICAL ENGINEERING JOURNAL (2018)

添加到收藏夹

Article Chemistry, Physical

Facile fabrication of mediator-free Z-scheme photocatalyst of phosphorous-doped ultrathin graphitic carbon nitride nanosheets and bismuth vanadate composites with enhanced tetracycline degradation under visible light

Yaocheng Deng et al.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2018)

添加到收藏夹

Review Chemistry, Physical

Regulating the surface of nanoceria and its applications in heterogeneous catalysis

Yuanyuan Ma et al.

SURFACE SCIENCE REPORTS (2018)

添加到收藏夹

Article Engineering, Environmental

Evaluating tetracycline degradation pathway and intermediate toxicity during the electrochemical oxidation over a Ti/Ti4O7 anode

Jianbing Wang et al.

WATER RESEARCH (2018)

添加到收藏夹

Article Chemistry, Multidisciplinary

Synthesis of Particulate Hierarchical Tandem Heterojunctions toward Optimized Photocatalytic Hydrogen Production

Bojing Sun et al.

ADVANCED MATERIALS (2018)

添加到收藏夹

Article Engineering, Environmental

Enhancement of H2O2 Decomposition by the Co-catalytic Effect of WS2 on the Fenton Reaction for the Synchronous Reduction of Cr(VI) and Remediation of Phenol

Chencheng Dong et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2018)

添加到收藏夹

Article Nanoscience & Nanotechnology

One-Pot Solvothermal Preparation of Fe3O4-Urushiol-Graphene Hybrid Nanocomposites for Highly Improved Fenton Reactions

Xuelin Zheng et al.

ACS APPLIED NANO MATERIALS (2018)

添加到收藏夹

Article Nanoscience & Nanotechnology

α-MoO3 as a Conductive 2D Oxide: Tunable n-Type Electrical Transport via Oxygen Vacancy and Fluorine Doping

Kyle Crowley et al.

ACS APPLIED NANO MATERIALS (2018)

添加到收藏夹

Article Engineering, Environmental

Toxicity of Wastewater with Elevated Bromide and Iodide after Chlorination, Chloramination, or Ozonation Disinfection

Shengkun Dong et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2017)

添加到收藏夹

Article Engineering, Environmental

Oxygen Vacancy Promoted Heterogeneous Fenton-like Degradation of Ofloxacin at pH 3.2-9.0 by Cu Substituted Magnetic Fe3O4@FeOOH Nanocomposite

Hang Jin et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2017)

添加到收藏夹

Article Chemistry, Multidisciplinary

Hydrothermal oxidation synthesis of rod-like ZnO and the influence of oxygen vacancy on photocatalysis

Yao Wang et al.

JOURNAL OF THE CHINESE CHEMICAL SOCIETY (2017)

添加到收藏夹

Article Engineering, Environmental

Hexavalent chromium as a cathodic electron acceptor in a bipolar membrane microbial fuel cell with the simultaneous treatment of electroplating wastewater

Changman Kim et al.

CHEMICAL ENGINEERING JOURNAL (2017)

添加到收藏夹

Article Chemistry, Physical

The role of Ar plasma treatment in generating oxygen vacancies in indium tin oxide thin films prepared by the sol-gel process

Deuk-Kyu Hwang et al.

APPLIED SURFACE SCIENCE (2017)

添加到收藏夹

Article Nanoscience & Nanotechnology

Simple but Effective Way To Enhance Photoelectrochemical Solar-Water-Splitting Performance of ZnO Nanorod Arrays: Charge-Trapping Zn(OH)2 Annihilation and Oxygen Vacancy Generation by Vacuum Annealing

Minki Baek et al.

ACS APPLIED MATERIALS & INTERFACES (2017)

添加到收藏夹

Article Chemistry, Physical

Enhanced photocatalytic oxidation of propylene over V-doped TiO2 photocatalyst: Reaction mechanism between V5+ and single-electron-trapped oxygen vacancy

Fengzhu Ren et al.

APPLIED CATALYSIS B-ENVIRONMENTAL (2015)

添加到收藏夹

Article Engineering, Environmental

Magnetic recoverable MnFe2O4 and MnFe2O4-graphene hybrid as heterogeneous catalysts of peroxymonosulfate activation for efficient degradation of aqueous organic pollutants

Yunjin Yao et al.

JOURNAL OF HAZARDOUS MATERIALS (2014)

添加到收藏夹

Article Fisheries

Comparison of effect of chitin, chitosan, chitosan oligosaccharide and N-acetyl-D-glucosamine on growth performance, antioxidant defenses and oxidative stress status of Penaeus monodon

Jin Niu et al.

AQUACULTURE (2013)

添加到收藏夹

Article Chemistry, Multidisciplinary

Effect of Nature and Location of Defects on Bandgap Narrowing in Black TiO2 Nanoparticles

Alberto Naldoni et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2012)

添加到收藏夹

Article Engineering, Environmental

Kinetics and efficiency of H2O2 activation by iron-containing minerals and aquifer materials

Anh Le-Tuan Pham et al.

WATER RESEARCH (2012)

添加到收藏夹

Article Chemistry, Multidisciplinary

The {001} facets-dependent high photoactivity of BiOCl nanosheets

Liqun Ye et al.

CHEMICAL COMMUNICATIONS (2011)

添加到收藏夹

Article Environmental Sciences

Aqueous photolysis of tetracycline and toxicity of photolytic products to luminescent bacteria

Shaojun Jiao et al.

CHEMOSPHERE (2008)

添加到收藏夹

Article Multidisciplinary Sciences

Electric polarization reversal and memory in a multiferroic material induced by magnetic fields

N Hur et al.

NATURE (2004)

添加到收藏夹

Article Multidisciplinary Sciences

Magnetic control of ferroelectric polarization

T Kimura et al.

NATURE (2003)

添加到收藏夹

Article Multidisciplinary Sciences

Epitaxial BiFeO3 multiferroic thin film heterostructures

J Wang et al.

SCIENCE (2003)

添加到收藏夹

Article Biochemical Research Methods

Preliminary assays to elucidate the structure of oxytetracycline's degradation products in sediments -: Determination of natural tetracyclines by high-performance liquid chromatography-fast atom bombardment mass spectrometry

R Delépée et al.

JOURNAL OF CHROMATOGRAPHY B (2000)

添加到收藏夹

© Peeref 2019-2024. All rights reserved.