In this study,bismuth oxyiodide with coexistence of plasmonic Bi and oxygen vacancy(Bi/BiO_(1-x)I)was successfully prepared and used towards photothermal and photocatalytic disinfection of pathogenic bacteria containi...In this study,bismuth oxyiodide with coexistence of plasmonic Bi and oxygen vacancy(Bi/BiO_(1-x)I)was successfully prepared and used towards photothermal and photocatalytic disinfection of pathogenic bacteria containing water.Plasmonic Bi and oxygen vacancies in Bi/BiO_(1-x)I induced a surface plasmon effect under the irradiation of simulated solar light from 500-900 nm and promoted the generation of hot electrons and reactive species(^(1)O^(2),h^(+)and·O_(2)^(-)).The catalyst showed promising performance for inactivation of E.coli K-12,with a 7.2 log inactivated achieved under the optimum conditions.A synergy between photothermal and photocatalytic inactivation was identified and discussed.The mechanisms of E.coli K-12 destruction were investigated.The destruction of extracellular antioxidant enzymes of E.coli K-12 was identified after inactivation.Moreover,the E.coli's membrane and its intracellular contents were attacked by the reactive species(^(1)O^(2),h^(+)and·O_(2)^(-))and the thermal effects.This work provides useful insights into the rational design of semimetal bismuth-mediated photocatalysts towards effective and sustainable water disinfection.展开更多
A rapid deactivation of TiO2 film was observed in the process of the photocatalytic degradation of formic acid in the presence of Cu(II) due to the deposition of Cu(0). A novel regeneration method, air-assisted elect...A rapid deactivation of TiO2 film was observed in the process of the photocatalytic degradation of formic acid in the presence of Cu(II) due to the deposition of Cu(0). A novel regeneration method, air-assisted electrooxidation, could efficiently retrieve the photocatalytic activity of the deact ivated film. HNO3 medium has a regeneration extent of 97.2% for first run, much higher than that of HCl and H2SO4 mediums.展开更多
The rapid development and globalization of modern tourism have brought more and more tourists and tourist attractions, bringing opportunities to the tourism industry. However, challenges also come with it, including t...The rapid development and globalization of modern tourism have brought more and more tourists and tourist attractions, bringing opportunities to the tourism industry. However, challenges also come with it, including the cost of travelers’ trust, the satisfaction of personalized tourism needs, and the supervision and management of tourist attractions. In order to solve these problems and improve the tourism experience, this paper designs a blockchain-based smart tourism platform. First, by adopting blockchain technology, a decentralized database is established to reduce the cost of trust for travelers. Secondly, through the blockchain-based smart tourism platform, travelers can customize personalized travel routes and itineraries according to their preferences and needs. The platform uses the data interaction function of blockchain to visually display various resources and services of tourist attractions, and travelers can choose according to their own preferences to enhance the personalized experience of tourism. Third, the smart tourism platform based on the blockchain can provide the reliability and transparency of data information, and through the decentralized nature of blockchain, the relevant data of tourist attractions can be recorded and stored, and cannot be tampered with, ensuring the authenticity and credibility of the data. Regulatory authorities can easily access and review these data, and more effectively control and supervise scenic spots. Finally, this paper combines DPOS (Delegated Proof of Stake) and PBFT (Practical Byzantine Fault Tolerance) consensus algorithms to improve the on-chain consensus efficiency of blockchain-based smart tourism platforms. The consensus algorithm is the core mechanism to ensure the normal operation and consistency of the blockchain system, and improve the throughput and performance of the system by introducing DPOS and PBFT algorithms.展开更多
Dear Editor,Biomolecular condensates have emerged as key players in cellular processes and responses to stress(Alberti and Hyman,2021).Recent studies have revealed that most biomolecular condensates arise from liquid-...Dear Editor,Biomolecular condensates have emerged as key players in cellular processes and responses to stress(Alberti and Hyman,2021).Recent studies have revealed that most biomolecular condensates arise from liquid-liquid phase separation(Banani et al.,2017;Shin and Brangwynne,2017),a process that has been described in the field of polymer chemistry.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.21876212,21976214,41603097,21673086 and 52070195)the Science and Technology Research Programs of Guangdong Province(No.2019A1515011015)+2 种基金the Science and Technology Program of Guangzhou(No.201904010353)the Fundamental Research Funds for the Central Universities(No.19lgpy157)supported by the Start-up Funds for High-Level Talents of Sun Yat-sen University(No.3800018821111)。
文摘In this study,bismuth oxyiodide with coexistence of plasmonic Bi and oxygen vacancy(Bi/BiO_(1-x)I)was successfully prepared and used towards photothermal and photocatalytic disinfection of pathogenic bacteria containing water.Plasmonic Bi and oxygen vacancies in Bi/BiO_(1-x)I induced a surface plasmon effect under the irradiation of simulated solar light from 500-900 nm and promoted the generation of hot electrons and reactive species(^(1)O^(2),h^(+)and·O_(2)^(-)).The catalyst showed promising performance for inactivation of E.coli K-12,with a 7.2 log inactivated achieved under the optimum conditions.A synergy between photothermal and photocatalytic inactivation was identified and discussed.The mechanisms of E.coli K-12 destruction were investigated.The destruction of extracellular antioxidant enzymes of E.coli K-12 was identified after inactivation.Moreover,the E.coli's membrane and its intracellular contents were attacked by the reactive species(^(1)O^(2),h^(+)and·O_(2)^(-))and the thermal effects.This work provides useful insights into the rational design of semimetal bismuth-mediated photocatalysts towards effective and sustainable water disinfection.
文摘A rapid deactivation of TiO2 film was observed in the process of the photocatalytic degradation of formic acid in the presence of Cu(II) due to the deposition of Cu(0). A novel regeneration method, air-assisted electrooxidation, could efficiently retrieve the photocatalytic activity of the deact ivated film. HNO3 medium has a regeneration extent of 97.2% for first run, much higher than that of HCl and H2SO4 mediums.
文摘The rapid development and globalization of modern tourism have brought more and more tourists and tourist attractions, bringing opportunities to the tourism industry. However, challenges also come with it, including the cost of travelers’ trust, the satisfaction of personalized tourism needs, and the supervision and management of tourist attractions. In order to solve these problems and improve the tourism experience, this paper designs a blockchain-based smart tourism platform. First, by adopting blockchain technology, a decentralized database is established to reduce the cost of trust for travelers. Secondly, through the blockchain-based smart tourism platform, travelers can customize personalized travel routes and itineraries according to their preferences and needs. The platform uses the data interaction function of blockchain to visually display various resources and services of tourist attractions, and travelers can choose according to their own preferences to enhance the personalized experience of tourism. Third, the smart tourism platform based on the blockchain can provide the reliability and transparency of data information, and through the decentralized nature of blockchain, the relevant data of tourist attractions can be recorded and stored, and cannot be tampered with, ensuring the authenticity and credibility of the data. Regulatory authorities can easily access and review these data, and more effectively control and supervise scenic spots. Finally, this paper combines DPOS (Delegated Proof of Stake) and PBFT (Practical Byzantine Fault Tolerance) consensus algorithms to improve the on-chain consensus efficiency of blockchain-based smart tourism platforms. The consensus algorithm is the core mechanism to ensure the normal operation and consistency of the blockchain system, and improve the throughput and performance of the system by introducing DPOS and PBFT algorithms.
基金supported by grants from the National Natural Science Foundation of China(32161133001)the Beijing Natural Science Foundation(JQ21020).
文摘Dear Editor,Biomolecular condensates have emerged as key players in cellular processes and responses to stress(Alberti and Hyman,2021).Recent studies have revealed that most biomolecular condensates arise from liquid-liquid phase separation(Banani et al.,2017;Shin and Brangwynne,2017),a process that has been described in the field of polymer chemistry.
