In this work,BiOCl/OVs-BiPO_(4)heterojunction photocatalysts were successfully in-situ prepared by treating of BiPO_(4)with dilute hydrochloric acid(HCl)under hydrothermal condition.Systematically characterization res...In this work,BiOCl/OVs-BiPO_(4)heterojunction photocatalysts were successfully in-situ prepared by treating of BiPO_(4)with dilute hydrochloric acid(HCl)under hydrothermal condition.Systematically characterization results confirm that BiOCl/BiPO_(4)heterojunctions have been successfully in-situ constructed and oxygen vacancies(OVs)are significantly increased.The OVs on the surface of the BiOCl/OVS-BiPO_(4)heterojunctions photocatalyst and the interface electric field at the interface of the heterojunctions effectively accelerate the separation and migration of photogenerated carriers,and the surface OVs provide more sites for adsorption and reaction.Consequently,BiOCl/OVs-BiPO_(4)heterojunction photocatalysts have higher separation rate of photoexcited e-/h+pairs and exhibit ascendant photocatalytic degradation activity.Electron paramagnetic resonance(EPR)technology and free radical capture experiments give strong evidence that·O2-exists in the reaction system and is the leading species during the degradation process.The experimental results reveal that the degradation efficiency of rhodamine B(RhB)over BiPO_(4)treated with 3 ml of 0.1%dilute hydrochloric acid(3HCl-BPO)is 2.42 times of that over the reference BiPO_(4).After ultraviolet(UV)light illumination for 20 min,the destruction degree of RhB on the 3HCl-BPO sample reaches 99%.Moreover,the degradation rate of tetracycline(TC)is also obviously improved over 3HCl-BPO compared with that on the reference BiPO_(4)after 40 min exposure to ultraviolet light.The excellent stability of the sample was demonstrated by five cycles.A reasonable enhancement mechanism for BiOCl/OVs-BiPO_(4)heterojunctions was proposed to elucidate the boosted photocatalytic performance.This work offers a facile and reliable reference to design high performance BiPO_(4)-based photocatalysts for environment purification.展开更多
Architecture framework has become an effective method recently to describe the system of systems(SoS)architecture,such as the United States(US)Department of Defense Architecture Framework Version 2.0(DoDAF2.0).As a vi...Architecture framework has become an effective method recently to describe the system of systems(SoS)architecture,such as the United States(US)Department of Defense Architecture Framework Version 2.0(DoDAF2.0).As a viewpoint in DoDAF2.0,the operational viewpoint(OV)describes operational activities,nodes,and resource flows.The OV models are important for SoS architecture development.However,as the SoS complexity increases,constructing OV models with traditional methods exposes shortcomings,such as inefficient data collection and low modeling standards.Therefore,we propose an intelligent modeling method for five OV models,including operational resource flow OV-2,organizational relationships OV-4,operational activity hierarchy OV-5a,operational activities model OV-5b,and operational activity sequences OV-6c.The main idea of the method is to extract OV architecture data from text and generate interoperable OV models.First,we construct the OV meta model based on the DoDAF2.0 meta model(DM2).Second,OV architecture named entities is recognized from text based on the bidirectional long short-term memory and conditional random field(BiLSTM-CRF)model.And OV architecture relationships are collected with relationship extraction rules.Finally,we define the generation rules for OV models and develop an OV modeling tool.We use unmanned surface vehicles(USV)swarm target defense SoS architecture as a case to verify the feasibility and effectiveness of the intelligent modeling method.展开更多
基金supported by Sichuan University of Science and Engineering(No.2021RC26)Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province(No.CSPC202105).
文摘In this work,BiOCl/OVs-BiPO_(4)heterojunction photocatalysts were successfully in-situ prepared by treating of BiPO_(4)with dilute hydrochloric acid(HCl)under hydrothermal condition.Systematically characterization results confirm that BiOCl/BiPO_(4)heterojunctions have been successfully in-situ constructed and oxygen vacancies(OVs)are significantly increased.The OVs on the surface of the BiOCl/OVS-BiPO_(4)heterojunctions photocatalyst and the interface electric field at the interface of the heterojunctions effectively accelerate the separation and migration of photogenerated carriers,and the surface OVs provide more sites for adsorption and reaction.Consequently,BiOCl/OVs-BiPO_(4)heterojunction photocatalysts have higher separation rate of photoexcited e-/h+pairs and exhibit ascendant photocatalytic degradation activity.Electron paramagnetic resonance(EPR)technology and free radical capture experiments give strong evidence that·O2-exists in the reaction system and is the leading species during the degradation process.The experimental results reveal that the degradation efficiency of rhodamine B(RhB)over BiPO_(4)treated with 3 ml of 0.1%dilute hydrochloric acid(3HCl-BPO)is 2.42 times of that over the reference BiPO_(4).After ultraviolet(UV)light illumination for 20 min,the destruction degree of RhB on the 3HCl-BPO sample reaches 99%.Moreover,the degradation rate of tetracycline(TC)is also obviously improved over 3HCl-BPO compared with that on the reference BiPO_(4)after 40 min exposure to ultraviolet light.The excellent stability of the sample was demonstrated by five cycles.A reasonable enhancement mechanism for BiOCl/OVs-BiPO_(4)heterojunctions was proposed to elucidate the boosted photocatalytic performance.This work offers a facile and reliable reference to design high performance BiPO_(4)-based photocatalysts for environment purification.
基金National Natural Science Foundation of China(71690233,71971213,71901214)。
文摘Architecture framework has become an effective method recently to describe the system of systems(SoS)architecture,such as the United States(US)Department of Defense Architecture Framework Version 2.0(DoDAF2.0).As a viewpoint in DoDAF2.0,the operational viewpoint(OV)describes operational activities,nodes,and resource flows.The OV models are important for SoS architecture development.However,as the SoS complexity increases,constructing OV models with traditional methods exposes shortcomings,such as inefficient data collection and low modeling standards.Therefore,we propose an intelligent modeling method for five OV models,including operational resource flow OV-2,organizational relationships OV-4,operational activity hierarchy OV-5a,operational activities model OV-5b,and operational activity sequences OV-6c.The main idea of the method is to extract OV architecture data from text and generate interoperable OV models.First,we construct the OV meta model based on the DoDAF2.0 meta model(DM2).Second,OV architecture named entities is recognized from text based on the bidirectional long short-term memory and conditional random field(BiLSTM-CRF)model.And OV architecture relationships are collected with relationship extraction rules.Finally,we define the generation rules for OV models and develop an OV modeling tool.We use unmanned surface vehicles(USV)swarm target defense SoS architecture as a case to verify the feasibility and effectiveness of the intelligent modeling method.
