您的检索：
学者姓名：李星
精炼检索结果：
年份
成果类型
收录类型
来源
综合
合作者
语言
清除所有精炼条件
摘要 ：
A Fe-doped graphite-like carbon nitride (g-C3N4) nanocomposites containing various Fe contents (5 wt.%, 10 wt. % and 15 wt.%) were prepared via two-step calcination thermal polymerization, and were employed as efficient heterogeneous photo-Fenton composites towards rhodamine B (RhB) removal in visible-light/H2O2 system. The sheet structure of g-C3N4 was refined down to nano-scale and less densely packed by the increasing Fe-doping ratio. X-ray diffraction (XRD), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) spectra indicated that Fe was doped completely into the g-C3N4 lattice. Over 90 %RhB was degraded in photo-Fenton system within 45 min under the optimal Fe-doping ratio of 10 wt.% (10 % Fe-g-C3N4). The degradation efficiency of photo-Fenton was superior in comparison with photocatalysis and Fenton reaction. The as-prepared composite exhibited excellent performance (similar to 90 % removal) and high stability in a wide range of pH value (3 similar to 9), and the degradation data well fitted with the pseudo-first-order kinetics model. The enhanced photo-Fenton catalytic activity benefited from the Z-scheme heterojunctions of Fe-g-C3N4, which improved the separation ability of photo-generated charge carriers and increased the electrons that participated in Fe2+/Fe3+ cycle. The main active oxygen species of Fe-g-C3N4 were hydroxyl radicals, followed by superoxide radicals and electron holes. The effect of Fe-doping was revealed by density functional theory calculation. The excellent recyclability and stability of Fe-g-C3N4 catalyst was also observed. Such photo-Fenton system was also effective to degrade other organic pollutants. The findings reported here offer promising implications in developing the utilization of Fe-g-C3N4 composite in photo-Fenton system for treatment of wastewater.
关键词 ：
Density functional theory (DFT) Density functional theory (DFT) Fe doped g-C3N4 Fe doped g-C3N4 Photo-Fenton Photo-Fenton RhB RhB
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Ji, Siyang , Yang, Yanling , Zhou, Zhiwei et al. Photocatalysis-Fenton of Fe-doped g-C3N4 catalyst and its excellent degradation performance towards RhB [J]. | JOURNAL OF WATER PROCESS ENGINEERING , 2021 , 40 . |
| MLA | Ji, Siyang et al. "Photocatalysis-Fenton of Fe-doped g-C3N4 catalyst and its excellent degradation performance towards RhB" . | JOURNAL OF WATER PROCESS ENGINEERING 40 (2021) . |
| APA | Ji, Siyang , Yang, Yanling , Zhou, Zhiwei , Li, Xing , Liu, Yuankun . Photocatalysis-Fenton of Fe-doped g-C3N4 catalyst and its excellent degradation performance towards RhB . | JOURNAL OF WATER PROCESS ENGINEERING , 2021 , 40 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Membrane filtration in various forms has become an increasingly used treatment method worldwide for the supply of safe drinking water. The fouling of membranes is commonly considered to be the major operational limitation to its wider application since it leads to frequent backwashing and a shortening of membrane life, and increased production costs. The components of natural organic matter (NOM) in surface waters have been reported previously to be important foulants of nanofiltration (NF) membranes, however, the potential beneficial effect of particular components of these 'foulants' has not been investigated or demonstrated to date. In this study, we have considered the roles of different organic materials including autochthonous NOM (e.g., biopolymers) and allochthonous NOM (e.g., humic substances) on the fouling of NF membranes by bench-scale tests with samples of two representative source waters (UK) taken in two different seasons (autumn and winter). Microfiltration (MF) and ultrafiltration (UF) were employed to generate two permeates, between which the presence of biopolymers (30 kDa - 90 kDa) is the major difference. We developed sequential filtration (MF/UFNF) to investigate biopolymers' behaviours in NF process. The results showed that the accumulation of biopolymers on NF membranes can mitigate fouling by providing a protective layer in which medium-low molecular weight (MW) materials (e.g. humic substances) are separated by adsorption and/or size exclusion. The protective layers assisted by biopolymers were seen to be thicker under scanning electron microscope (SEM) observation and characterized by higher roughness (i.e. three-dimensional, spacial structure) and greater adsorptive capacity. Moreover, improvement on NF membrane fouling mitigation could be more significant in autumn, comparing to that in winter. The findings in this study were found to be repeatable in similar tests with samples of comparable raw waters in China, and will be important to the practical application of NF membrane systems in terms of a new approach to combating fouling in long-term operation.
关键词 ：
Biopolymers Biopolymers Fouling control Fouling control Nanofiltration Nanofiltration Natural organic matter Natural organic matter Seasonal changes Seasonal changes Surface waters Surface waters
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Su, Zhaoyang , Liu, Ting , Li, Xing et al. Beneficial impacts of natural biopolymers during surface water purification by membrane nanofiltration [J]. | WATER RESEARCH , 2021 , 201 . |
| MLA | Su, Zhaoyang et al. "Beneficial impacts of natural biopolymers during surface water purification by membrane nanofiltration" . | WATER RESEARCH 201 (2021) . |
| APA | Su, Zhaoyang , Liu, Ting , Li, Xing , Graham, Nigel , Yu, Wenzheng . Beneficial impacts of natural biopolymers during surface water purification by membrane nanofiltration . | WATER RESEARCH , 2021 , 201 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
For comprehensive insights into the effects of disinfection strategy on antibiotic resistance genes (ARGs) in pipe wall biofilm to ensure the biosafety of domestic hot water system (DHWS), this study investigated the occurrence, removal and interactions of ARGs, as well as their potential hosts. The shifts in biofilm community composition and microbial functions (level three) were observed under different disinfection strategies. A total of 40 ARG subtypes within seven antibiotic types were predicted. The total gene counts ranged from 6.10 x 104 to 2.31 x 105, and decreased after the chlorine, chlorine dioxide, silver ions (Ag+), ultraviolet (UV), and Ag+-UV disinfection. The ARGs in samples under different disinfection strategies were divided into four groups, and the removal and enrichment of the same ARGs in each group were almost consistent. The complex interactions among ARGs were weakened and altered by disinfection (edges decreased from 237 to 178), with yebQ and marC as the hub ARGs, but positive correlations were still dominant. Moreover, 36 nonpathogenic bacteria, including high- (Blastocatella), mid- (Ornatilinea) and low-abundant genera (Bdellovibrio), as well as 18 potential pathogens (Vibrio and Bacillus) were identified as the potential hosts harboring ARGs. Overall, this study provides some new insights into the occurrence of ARGs and their fate under eight disinfection strategies, which is of great significance for a comprehensive understanding and control of ARGs in DHWS.
关键词 ：
Antibiotic resistance genes Antibiotic resistance genes Disinfection Disinfection Domestic hot water system Domestic hot water system Potential hosts Potential hosts Removal and enrichment Removal and enrichment
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Li, Na , Li, Xing , Yang, Yan-Lin et al. Antibiotic resistance genes in pipe wall biofilm under eight disinfection strategies in domestic hot water system: Occurrence, removal and interactions [J]. | JOURNAL OF WATER PROCESS ENGINEERING , 2021 , 43 . |
| MLA | Li, Na et al. "Antibiotic resistance genes in pipe wall biofilm under eight disinfection strategies in domestic hot water system: Occurrence, removal and interactions" . | JOURNAL OF WATER PROCESS ENGINEERING 43 (2021) . |
| APA | Li, Na , Li, Xing , Yang, Yan-Lin , Fan, Xiao-Yan . Antibiotic resistance genes in pipe wall biofilm under eight disinfection strategies in domestic hot water system: Occurrence, removal and interactions . | JOURNAL OF WATER PROCESS ENGINEERING , 2021 , 43 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Conventional treatment such as coagulation and sand filtration prior to ultrafiltration (UF) is widely used for treating contaminated surface water sources for potable supply. While beneficial, conventional treatment alone is unable to control membrane fouling effectively in many cases, and there is continuing interesting in the use of additional, complementary methods such as oxidation and adsorption in the pre-treatment of raw water prior to UF. In this study, the applications of ozonation (O-3) and powdered activated carbon (PAC) in the submerged UF system (SUF) have been evaluated at laboratory-scale employing test water after conventional water treatment. In parallel tests with and without the pretreatment, the impact of O-3 on the increase of trans-membrane pressure was evaluated and with the analysis of membrane fouling resistance, both as the cake layer and within membrane pores. The results indicated that the O-3/SUF system can alleviate about 20.43% membrane fouling, compared with SUF system without pre-ozonation. Pre-ozonation combined with PAC removed protein-like substances, resulted in a 39.2% reduction of total organic carbon; increased the amount of attached biomass on the PAC and membrane surface, resulted in the improvement of the biodegradability of microorganisms. The application of O-3 can reduce the stickiness of surface of organic pollutants, which is beneficial to remove the pollutants deposited on membrane surface by chemical backwashing. Therefore, the application of pre-ozonation and PAC within SUF system is a potentially important approach for fully mitigating membrane fouling. (C) 2020 Elsevier B.V. All rights reserved.
关键词 ：
Pre-ozonation Pre-ozonation Submerged ultrafiltration Submerged ultrafiltration Dissolved organic matter Dissolved organic matter Membrane fouling Membrane fouling
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Yin, Wenchao , Liu, Yongwang , Du, Peng et al. Fouling control of pre-ozonation on a submerged ultrafiltration system: Characteristics and mechanisms [J]. | ENVIRONMENTAL TECHNOLOGY & INNOVATION , 2020 , 20 . |
| MLA | Yin, Wenchao et al. "Fouling control of pre-ozonation on a submerged ultrafiltration system: Characteristics and mechanisms" . | ENVIRONMENTAL TECHNOLOGY & INNOVATION 20 (2020) . |
| APA | Yin, Wenchao , Liu, Yongwang , Du, Peng , Li, Xing , Zhao, Li , Zhou, Zhiwei et al. Fouling control of pre-ozonation on a submerged ultrafiltration system: Characteristics and mechanisms . | ENVIRONMENTAL TECHNOLOGY & INNOVATION , 2020 , 20 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Gravity-driven membrane (GDM) ultrafiltration is a promising water treatment method due to its low energy consumption and low maintenance. However, the low stable permeability in algae-laden water treatment is currently limiting its wider application. With the ultimate goal of increasing permeability, the aim of this study was to evaluate the effect of a composite coagulant of aluminum sulfate-chitosan (AS-CS) on the GDM filtration performance. In parallel tests with a single AS coagulant and without pre-coagulation, the analysis of membrane fouling resistance and the membrane fouling mechanism were evaluated. The results indicated that the AS-CS/GDM system can alleviate 23.74% and 58.80% membrane fouling, respectively, compared with AS/GDM and the GDM system. The AS-CS/GDM system can effectively remove humic-like substances having a molecular weight (MW) of 3-100 kDa, resulting in removal of 98.32% of algae cells and removal of 66.25% of dissolved organic carbon; the AS-CS/GDM system thereby improved the concentration of attached biomass on the membrane surface with the stronger biodegradability of organic matters. The application of AS-CS pre-coagulation in the GDM process could enhance the proliferation of microorganisms and the removal of low molecular weight humic-like substances. Therefore, the AS-CS/GDM system is a potentially important approach for algae-laden water treatment.
关键词 ：
algae-laden water algae-laden water AS-CS pre-coagulation AS-CS pre-coagulation floc property floc property GDM membrane fouling GDM membrane fouling
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Du, Peng , Li, Xing , Yang, Yanling et al. Algae-Laden Fouling Control by Gravity-Driven Membrane Ultrafiltration with Aluminum Sulfate-Chitosan: The Property of Floc and Cake Layer [J]. | WATER , 2020 , 12 (7) . |
| MLA | Du, Peng et al. "Algae-Laden Fouling Control by Gravity-Driven Membrane Ultrafiltration with Aluminum Sulfate-Chitosan: The Property of Floc and Cake Layer" . | WATER 12 . 7 (2020) . |
| APA | Du, Peng , Li, Xing , Yang, Yanling , Zhou, Zhiwei , Fan, Xiaoyan , Feng, Jianyong . Algae-Laden Fouling Control by Gravity-Driven Membrane Ultrafiltration with Aluminum Sulfate-Chitosan: The Property of Floc and Cake Layer . | WATER , 2020 , 12 (7) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Sodium dodecyl benzenesulfonate (SDBS) is a common anionic surfactant used in detergents, and a major household pollutant. SDBS released with bathing and laundry wastewater causes eutrophication of water bodies and toxicity in aquatic organisms. We compared the degradation of SDBS in aqueous solution, by vacuum ultraviolet (VUV, 254 nm and 185 nm) and ultraviolet irradiation (UV, 254 nm). Using lab-scale reactors, VUV degraded SDBS more efficiently than UV, also achieving a higher mineralization rate. HO center dot was the main reactive oxygen species produced by VUV. SDBS concentration affected the distribution of absorbed VUV and UV photons, and influenced the reaction triggered. VUV was more efficient at lower concentrations, when indirect oxidation by HO center dot was prevalent. The UV process, relied mostly on direct photolysis, and was affected slightly by initial concentration. VUV was more efficient at solution pH of 5 and 9, while UV performed better at alkaline conditions. Temperature increased the degradation rates for both processes. The addition of SO42- slightly promoted SDBS degradation in the VUV process, while Cl- and HCO3- inhibited it. For UV, SO42- and Cl- illustrated no significant difference on the degradation, while HCO3- had a positive impact on the system. We identified the four photoproducts of SDBS degradation by VUV, and proposed a degradation pathway. Finally, the fact the VUV could be efficiently used to remove anionic surfactant from real wastewater, proved that it can be applied efficiently with low energetic consumption.
关键词 ：
Bathing and laundry wastewater Bathing and laundry wastewater SDBS SDBS Ultraviolet (UV) Ultraviolet (UV) Vacuum ultraviolet (VUV) Vacuum ultraviolet (VUV)
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Li, Hang , Yang, Yanling , Gao, Jingfeng et al. Degradation of sodium dodecyl benzenesulfonate by vacuum ultraviolet irradiation [J]. | JOURNAL OF WATER PROCESS ENGINEERING , 2020 , 34 . |
| MLA | Li, Hang et al. "Degradation of sodium dodecyl benzenesulfonate by vacuum ultraviolet irradiation" . | JOURNAL OF WATER PROCESS ENGINEERING 34 (2020) . |
| APA | Li, Hang , Yang, Yanling , Gao, Jingfeng , Li, Xing , Zhou, Zhiwei , Wang, Nan et al. Degradation of sodium dodecyl benzenesulfonate by vacuum ultraviolet irradiation . | JOURNAL OF WATER PROCESS ENGINEERING , 2020 , 34 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
To ensure the biosafety of the domestic hot water system (DHWS) in the case of residual chlorine exhaustion and biofilm exfoliation, the secondary disinfection effects of chlorine alone or in combination with ultraviolet (UV) on microorganisms and its impact on biofilm bacterial community were investigated. A biofilm annular reactor was used to simulate DHWS conditions on a lab-scale and reproducibly. The results showed that even in the case of biofilm exfoliated into domestic hot water seriously, the chlorine combined with UV (chlorine-UV) disinfection could achieve high-level inactivation of suspended bacteria in a short time. Chlorine-UV disinfection effectively reduced the diversity of the bacterial community and affected bacterial community structure. It decreased the relative abundance of pathogenic bacteria, including Legionella, Staphylococcus. Chlorine-UV disinfection is suitable for the secondary disinfection of DHWS, which can ensure biosafety and effectively reduce bacterial contamination.
关键词 ：
Bacterial community Bacterial community Biosafety Biosafety Domestic hot water Domestic hot water Pathogenic bacteria Pathogenic bacteria Secondary disinfection Secondary disinfection
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Li, Na , Li, Xing , Yang, Yanling et al. Secondary disinfection ensures biosafety of domestic hot water and its impact on biofilm bacterial community [J]. | DESALINATION AND WATER TREATMENT , 2020 , 173 : 186-196 . |
| MLA | Li, Na et al. "Secondary disinfection ensures biosafety of domestic hot water and its impact on biofilm bacterial community" . | DESALINATION AND WATER TREATMENT 173 (2020) : 186-196 . |
| APA | Li, Na , Li, Xing , Yang, Yanling , Shang, Sihong , Fan, Xiaoyan , Liu, Yongwang et al. Secondary disinfection ensures biosafety of domestic hot water and its impact on biofilm bacterial community . | DESALINATION AND WATER TREATMENT , 2020 , 173 , 186-196 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Manganese pollution particularly in the form of dissolved Mn2+ is an important problem in groundwater treatment. The main approaches for Mn2+ removal from groundwater are chemical catalytic oxidation and biological oxidation. Their relative attribution to Mn2+ removal and relationship has not been clarified at the matured stage. An influent of water containing 2.0 and 4.0 mg/L Mn2+ was filtered through columns filled with manganese sand that had either been inoculated with a manganese-adapted microbial community or had been pre-oxidized with potassium permanganate. Either treatment resulted in good manganese removal capacities that maintained a final concentration in the effluent below 0.05 mg Mn2+/L at two concentrations for a period of 130 d. Among the matured period, the direct contribution rate of biological manganese removal was less than 20%. During operation, biological induction and chemical induction were both responsible for the formation of hexagonal Birnessite-type manganese oxide, whose physical characteristics were characterized and determined. Biological oxidation and chemical catalytic oxidation in the maturation of filter media were interlinked through the formation of Birnessite-type manganese oxide. Manganese removal during maturation was mainly attributed to cyclic autocatalysis rather than biological factors.
关键词 ：
Autocatalysis Autocatalysis Biological oxidation Biological oxidation Chemical catalytic oxidation Chemical catalytic oxidation Hexagonal birnessite Hexagonal birnessite Matured manganese removal filter Matured manganese removal filter
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Wang, Xiaoyu , Yang, Yanling , Li, Xing et al. Manganese removal and characterization of manganese oxides induced by biologically and chemically on the matured sand [J]. | DESALINATION AND WATER TREATMENT , 2020 , 190 : 279-293 . |
| MLA | Wang, Xiaoyu et al. "Manganese removal and characterization of manganese oxides induced by biologically and chemically on the matured sand" . | DESALINATION AND WATER TREATMENT 190 (2020) : 279-293 . |
| APA | Wang, Xiaoyu , Yang, Yanling , Li, Xing , Zhou, Zhiwei , Fan, Xiaoyan , Liu, Yuankun et al. Manganese removal and characterization of manganese oxides induced by biologically and chemically on the matured sand . | DESALINATION AND WATER TREATMENT , 2020 , 190 , 279-293 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Acoustic emission (AE) source localization is a powerful detection method. Time Difference Mapping (TDM) method is an effective method for detecting defects in complex structures. The core of this method is to search for a point with the minimum distance away from the verification point in the time difference database. In Traditional Time Difference Mapping (T-TDM) method and Improved Time Difference Mapping (I-TDM) method, the larger database and denser grids allow the higher localization accuracy. If the location points are not included in the database, the localization accuracy of the T-TDM and I-TDM methods will be greatly affected. To solve the above problems, a new AE source localization method, Generalized Regression Neural Network Based on Time Difference Mapping (GRNN-TDM), is proposed to improve the localization accuracy in the study. In the proposed method, the time difference data of the sensor path on all nodes in the time difference mapping are used as the training input data and the coordinates of grid nodes are used as the training output data. After continuous learning and training, the neural network model predicts its possible source location with the time difference data collected from the verification point. In this paper, the localization of AE sources with T-TDM, I-TDM and GRNN-TDM methods was studied in four composite plates with different fiber layers and an aluminum plate with holes. The localization results showed that the localization accuracy of the GRNN-TDM method was higher than that of T-TDM and I-TDM methods.
关键词 ：
Acoustic emission Acoustic emission Composite plate Composite plate Generalized regression neural network Generalized regression neural network Structural health monitoring Structural health monitoring Time difference mapping method Time difference mapping method
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Liu, Z. H. , Peng, Q. L. , Li, X. et al. Acoustic Emission Source Localization with Generalized Regression Neural Network Based on Time Difference Mapping Method [J]. | EXPERIMENTAL MECHANICS , 2020 , 60 (5) : 679-694 . |
| MLA | Liu, Z. H. et al. "Acoustic Emission Source Localization with Generalized Regression Neural Network Based on Time Difference Mapping Method" . | EXPERIMENTAL MECHANICS 60 . 5 (2020) : 679-694 . |
| APA | Liu, Z. H. , Peng, Q. L. , Li, X. , He, C. F. , Wu, B. . Acoustic Emission Source Localization with Generalized Regression Neural Network Based on Time Difference Mapping Method . | EXPERIMENTAL MECHANICS , 2020 , 60 (5) , 679-694 . |
| 导入链接 | NoteExpress RIS BibTex |
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Wang, Nan , Li, Xing , Yang, Yanling et al. Photocatalytic degradation of sulfonamides by Bi 2 O 3-TiO 2 /PAC ternary composite: Mechanism, degradation pathway [J]. | JOURNAL OF WATER PROCESS ENGINEERING , 2020 , 36 . |
| MLA | Wang, Nan et al. "Photocatalytic degradation of sulfonamides by Bi 2 O 3-TiO 2 /PAC ternary composite: Mechanism, degradation pathway" . | JOURNAL OF WATER PROCESS ENGINEERING 36 (2020) . |
| APA | Wang, Nan , Li, Xing , Yang, Yanling , Zhou, Zhiwei , Shang, Yi , Zhuang, Xiaoxuan . Photocatalytic degradation of sulfonamides by Bi 2 O 3-TiO 2 /PAC ternary composite: Mechanism, degradation pathway . | JOURNAL OF WATER PROCESS ENGINEERING , 2020 , 36 . |
| 导入链接 | NoteExpress RIS BibTex |
导出
| 数据： |
选中 到 |
| 格式： |
