Pd^(0)-O v-Ce^(3+) Interfacial Sites with Charge Redistribution for Enhanced Hydrogenation of Methyl Oleate to Methyl Stearate

Improving the efficiency of metal/reducible metal oxide interfacial sites for hydrogenation reactions of unsaturated groups(e.g.,C=C and C=O)is a promising yet challenging endeavor.In our study,we developed a Pd/CeO_(2) catalyst by enhancing the oxygen vacancy(O V)concentration in CeO_(2) through high-temperature treatment.This process led to the formation of an interface structure ideal for supporting the hydrogenation of methyl oleate to methyl stearate.Specifi cally,metal Pd^(0) atoms bonded to the O V in defective CeO_(2) formed Pd^(0)-O v-Ce^(3+)interfacial sites,enabling strong electron transfer from CeO_(2) to Pd.The interfacial sites exhibit a synergistic adsorption eff ect on the reaction substrate.Pd^(0) sites promote the adsorption and activation of C=C bonds,while O V preferably adsorbs C=O bonds,mitigating competition with C=C bonds for Pd^(0) adsorption sites.This synergy ensures rapid C=C bond activation and accelerates the attack of active H*species on the semi-hydrogenated intermediate.As a result,our Pd/CeO_(2)-500 catalyst,enriched with Pd^(0)-O v-Ce^(3+)interfacial sites,dem-onstrated excellent hydrogenation activity at just 30℃.The catalyst achieved a Cis-C18:1 conversion rate of 99.8% and a methyl stearate formation rate of 5.7 mol/(h·g metal).This work revealed the interfacial sites for enhanced hydrogenation reactions and provided ideas for designing highly active hydrogenation catalysts.

使用气道内杂交支架治疗复杂气道狭窄和气道瘘疗效与安全性分析

背景与目的气道内支架广泛应用于气管狭窄和气管瘘的治疗,但使用气道内支架重建复杂气道的临床数据仍不充足。硅酮支架杂交金属支架重建复杂气道的有效性和安全性。方法纳入无法手术的复杂恶性气道狭窄和气道瘘患者。使用Y型硅酮支架联合金属覆膜支架(杂交支架)重建气道。评价置入支架后6个月的疗效和并发症。结果共纳入23例患者,置入23枚Y型硅酮支架和25枚金属覆膜支架。19例患者(19/23,82.6%)置入支架后症状迅速缓解。支架平均置入(153.43±9.14)d。置入支架后改良呼吸困难指数(modified British Medical Research Council,mMRC)、卡氏功能状态(Karnofsky performance status,KPS)评分和功能状态(performance status,PS)评分显著改善。12例患者带支架生存超过6个月。其余患者肿瘤进展导致6个月内死亡。无支架置入相关死亡及严重并发症。结论杂交支架重建恶性复杂气道疗效确切,耐受良好。

面向复杂曲率变化的智能车路径跟踪控制

针对智能车路径跟踪过程中对于复杂曲率变化工况适应能力弱的问题,提出了一种基于RBF神经网络补偿模型预测的控制方法。首先以3自由度智能车动力学模型作为预测模型,通过对线性时变方程分析后得到状态转移误差模型,利用RBF神经网络自适应补偿误差,保证控制的精确性,提高了路径跟踪准确性。最后,以中国智能汽车大赛比赛赛道为原型构建了包括直线路段、蛇行路段与双移线路段的复杂路径曲率变化工况,在半实车仿真平台上验证了高速环境下控制方法的路径跟踪效果。结果显示,最大轨迹跟踪误差在0.285 m范围内,并且侧向加速度最大为0.3299 m/s2,保证了路径跟踪的准确性与稳定性。

S-Scheme photocatalyst TaON/Bi_(2)WO_(6) nanofibers with oxygen vacancies for efficient abatement of antibiotics and Cr(VI):Intermediate eco-toxicity analysis and mechanistic insights

Enlightened by natural photosynthesis,developing efficient S-scheme heterojunction photocatalysts for deleterious pollutant removal is of prime importance to restore environment.Herein,novel TaON/Bi_(2)WO_(6) S-scheme heterojunction nanofibers were designed and developed by in-situ growing Bi_(2)WO_(6) nanosheets with oxygen vacancies(OVs)on TaON nanofibers.Thanks to the efficiently spatial charge disassociation and preserved great redox power by the unique S-scheme mechanism and OVs,as well as firmly interfacial contact by the core-shell 1D/2D fibrous hetero-structure via the in-situ growth,the optimized TaON/Bi_(2)WO_(6) heterojunction unveils exceptional visible-light photocatalytic property for abatement of tetracycline(TC),levofloxacin(LEV),and Cr(Ⅵ),respectively by 2.8-fold,1.0-fold,and 1.9-fold enhancement compared to the bare Bi_(2)WO_(6),while maintaining satisfactory stability.Furthermore,the systematic photoreaction tests indicate Ta-ON/Bi_(2)WO_(6) has the high practicality in the elimination of pollutants in aquatic environment.The degradation pathway of tetracycline and intermediate eco-toxicity were determined based on HPLC–MS combined with QSAR calculation,and a possible photocatalytic mechanism was elucidated.This work provides a guideline for designing high-performance TaON-based S-scheme photocatalysts with defects for environment protection.

Ni-based photocatalytic H_2-production cocatalysts

Photocatalysis is believed to be one of the best methods to realize sustainable H2 production. However, achieving this through heterogeneous photocatalysis still remains a great challenge owing to the absence of active sites, sluggish surface reaction kinetics, insufficient charge separation, and a high thermodynamic barrier. Therefore, cocatalysts are necessary and of great significance in boosting photocatalytic H2 generation. This review will focus on the promising and appealing low-cost Ni-based H2-generation cocatalysts as the alternatives for the high-cost and low-abundance noble metal cocatalysts. Special emphasis has been placed on the design principle, modification strategies for further enhancing the activity and stability of Ni-based cocatalysts, and identification of the exact active sites and surface reaction mechanisms. Particularly, four types of modification strategies based on increased light harvesting, enhanced charge separation, strengthened interface interaction, and improved electrocatalytic activity have been thoroughly discussed and compared in detail. This review may open a new avenue for designing highly active and durable Ni-based cocatalysts for photocatalytic H2 generation.

The correlation between nitrogen species in coke and NO_x formation during regeneration

Nitrogen oxides （NOx） emission during the regeneration ofcoked fluid catalytic cracking （FCC） catalysts is an en- vironmental issue. In order to identify the correlations between nitrogen species in coke and different nitrogen- containing products in tail gas, three coked catalysts with multilayer structural coke molecules were prepared in a fixed bed with model compounds （o-xylene and quinoline） at first. A series of characterization methods were used to analyze coke, including elemental analysis, FT-IR, XPS, and TG-MS. XPS characterization indicates all coked catalysts present two types of nitrogen species and the type with a higher binding energy is related with the inner part nitrogen atoms interacting with acid sites. Due to the stronger adsorption ability on acid sites for basic nitrogen compounds, the multilayer structural coke has unbalanced distribution of carbon and ni- trogen atoms between the inner part and the outer edge, which strongly affects gas product formation. At the early stage of regeneration, oxidation starts from the outer edge and the product NO can be reduced to N2 in high CO concentration. At the later stage, the inner part rich in nitrogen begins to be exposed to 02. At this period, the formation of CO decreases due to lack of carbon atoms, which is not beneficial to the reduction of NO. There- fore, nitrogen species in the inner part of multilayer structural coke contributes more to NOx formation. Based on the multilayer structure model of coke molecule and its oxidation behavior, a possible strategy to control NOx emission was discussed merely from concept.

The Solar Upper Transition Region Imager(SUTRI)Onboard the SATech-01 Satellite

The Solar Upper Transition Region Imager(SUTRI)onboard the Space Advanced Technology demonstration satellite(SATech-01),which was launched to a Sun-synchronous orbit at a height of~500 km in 2022 July,aims to test the on-orbit performance of our newly developed Sc/Si multi-layer reflecting mirror and the 2k×2k EUV CMOS imaging camera and to take full-disk solar images at the Ne VII 46.5 nm spectral line with a filter width of~3 nm.SUTRI employs a Ritchey-Chrétien optical system with an aperture of 18 cm.The on-orbit observations show that SUTRI images have a field of view of~416×416 and a moderate spatial resolution of~8″without an image stabilization system.The normal cadence of SUTRI images is 30 s and the solar observation time is about16 hr each day because the earth eclipse time accounts for about 1/3 of SATech-01's orbit period.Approximately15 GB data is acquired each day and made available online after processing.SUTRI images are valuable as the Ne VII 46.5 nm line is formed at a temperature regime of~0.5 MK in the solar atmosphere,which has rarely been sampled by existing solar imagers.SUTRI observations will establish connections between structures in the lower solar atmosphere and corona,and advance our understanding of various types of solar activity such as flares,filament eruptions,coronal jets and coronal mass ejections.

Engineering three-layer core–shell S-1/TS-1@dendritic-SiO_(2) supported Au catalysts towards improved performance for propene epoxidation with H_(2) and O_(2)

The advocacy of green chemical industry has led to the development of highly efficient catalysts for direct gas-phase propene epoxidation with green,sustainable and simple essence.The S-1/TS-1@dendritic-SiO_(2) material with three-layer core–shell structure was developed and used as the support for Au catalysts,which showed simultaneously fantastic PO formation rate,PO selectivity and stability(over 100 h)for propene epoxidation with H_(2) and O_(2).It is found that silicalite-1(S-1)core and the middle thin layer of TS-1 offer great mass transfer ability,which could be responsible for the excellent stability.The designed dendritic SiO_(2) shell covers part of the acid sites on the external surface of TS-1,inhibiting the side reactions and improving the PO selectivity.Furthermore,three kinds of SiO_(2) shell morphologies(i.e.,dendritic,net,mesoporous shell)were designed,and relationship between shell morphology and catalytic performance was elucidated.The results in this paper harbour tremendous guiding significance for the design of highly efficient epoxidation catalysts.

Defect-engineered Mn_(3)O_(4)/CNTs composites enhancing reaction kinetics for zinc-ions storage performance

The designing of reasonable nanocomposite materials and proper introduction of defect engineering are of great significance for the improvement of the poor electronic conductivity and slow reaction kinetics of manganese-based compounds. Herein, we report manganese-deficient Mn_(3)O_(4) nanoparticles which grow in-situ on highly conductive carbon nanotubes(CNTs)(denoted as DMOC) as an advanced cathode material for aqueous rechargeable zinc-ion batteries(RAZIBs). According to experimental and calculation results, the DMOC cathode integrates the advantages of enriched Mn defects and small particle size. These features not only enhance electronic conductivity but also create more active site and contribute to fast reaction kinetics. Moreover, the structure of DMOC is maintained during the charging and discharging process, thus benefiting for excellent cycle stability. As a result, the DMOC electrode delivers a high specific capacity of 420.6 m A h g^(-1) at 0.1 A g^(-1) and an excellent cycle life of 2800 cycles at 2.0 A g^(-1) with a high-capacity retention of 84.1%. In addition, the soft-packaged battery assembled with DMOC cathode exhibits long cycle life and high energy density of 146.3 Wh kg^(-1) at 1.0 A g^(-1) . The results are beneficial for the development of Zn/Mn_(3)O_(4) battery for practical energy storage.

New design principles for the bath towards chromate-and crack-free conversion coatings on magnesium alloys

Cracking and low thickness are major obstacles to the high corrosion performance of conversion coating on magnesium alloy.In this work,the ratio of total acidity to p H(TA/p H)was applied as an indicator,and new principles regarding the design of conversion bath were proposed.The treatment bath should be composed of species that can be categorized into two groups:the first group of species that react with Mg substrate to increase the local p H at the interface;the second group that precipitate and contributes to the growth of coating.The species belong to second group exists in a supersaturated state and its precipitation process is almost independent on the reactions of the species in first group.By this way,a thick and crack-free two-layered conversion coating is obtained.Moreover,the nature of the adjustment of TA/p H and the roles of the oxidizing agent and catalyst were discussed.

Microwave absorption of magnesium/hydrogen-treated titanium dioxide nanoparticles

Interactions between materials and electromagnetic irradiations in the microwave frequency are critical for many civil and military applications, such as radar detection, communications, information processing and transport et al. Dipole rotations or magnetic domain resonance are the mainly traditional mechanisms for microwave absorption. The recent finding of the excellent microwave absorption from hydrogenated TiO2 nanoparticles provides us an alternative approach for achieving such absorption, by manipulating the structural defects inside nanoparticles through hydrogenation. In this study, we demonstrate that the microwave absorption can be not only achieved but fine-tuned with TiO2 nanoparticles thermally treated in a Mg/H2 environment. Their position and efficiency can be effectively controlled by the treating temperature. Specifically, the microwave absorption position shifts to the lower frequency region as the treating temperature increases, and there seems to exist an optimal treating temperature to obtain the maximum efficiency, as the absorbing efficiency first increases, and then decreases, with the increase in treatment temperature. Therefore, this study enriches our knowledge and understanding microwave absorption from TiO2-based nanomaterials which may inspire new ideas on other systems to enhance their performance as well.

Enhancing the dynamic electron transfer of Au species on wormhole-like TS-1 for boosting propene epoxidation performance with H_(2) and O_(2)

Engineering unique electronic structure of catalyst to boost catalytic performance is of prime scientific and industrial importance.Herein,the identification of intrinsic electronic sensitivity for direct propene epoxidation was first achieved over highly stable Au/wormhole-like TS-1 catalyst.Results show that the electron transfer of Au species can be regulated by manipulating the dynamic evolutions and contents of Au valence states,thus resulting in different catalytic performance in 100 h time-on-stream.By DFT calculations,kinetic analysis and multicharacterizations,it is found that the Au^(0) species with higher electronic population can easily transfer more electrons to activate surface O_(2) compared with Au^(1+) and Au^(3+) species.Moreover,there is a positive correlation between Au^(0) content and activity.Based on this correlation,a facile strategy is further proposed to boost Au^(0) percentage,resulting in the reported highest PO formation rate without adding promoters.This work harbors tremendous guiding significance to the design of highly efficient Au/Ti-containing catalyst for propene epoxidation with H_(2) and O_(2).

Heterostructuring noble-metal-free 1T'phase MoS_(2) with g-C_(3)N_(4) hollow nanocages to improve the photocatalytic H2 evolution activity

In this work,we report the preparation of 1T'-MoS_(2)/g-C_(3)N_(4) nanocage(NC)heterostructure by loading 2D semi-metal noble-metal-free 1T'-MoS_(2) on the g-C_(3)N_(4) nanocages(NCs).DFT calculation and experimental data have shown that the 1T'-MoS_(2)/g-C_(3)N_(4) NC heterostructure has a stronger light absorption capacity and larger specific surface area than pure g-C_(3)N_(4) NCs and g-C_(3)N_(4) nanosheets(NSs),and the presence of the co-catalysts 1T'-MoS_(2) can effectively inhibit the photoinduced carrier recombination.As a result,the 1T'-MoS_(2)/g-C_(3)N_(4) NC heterostructure with an optimum 1T'-MoS_(2) loading of 9 wt%displays a hydrogen evolution rate of 1949 mmol h^(-1) g^(-1),162.4,1.2,1.5,1.6 and 1.2 times than pure g-C_(3)N_(4) NCs(12 mmol h^(-1) g^(-1)),Pt/g-C_(3)N_(4) NCs(1615 mmol h^(-1) g^(-1))and Pt/g-C_(3)N_(4) nanosheets(NSs,1297 mmol h^(-1) g^(-1)),1T'-MoS_(2)/g-C_(3)N_(4) nanosheets(1216 mmol h^(-1) g^(-1))and 2H-MoS_(2)/g-C_(3)N_(4) nanocages(1573 mmol h^(-1) g^(-1)),respectively,and exhibits excellent cycle stability.Therefore,1T'-MoS_(2)/g-C_(3)N_(4) NC heterostructure is a suitable photocatalyst for green H_(2) production.

A Free Surface Frequency Domain Green Function with Viscous Dissipation and Partial Reflections from Side Walls

The free-surface Green function method is widely used in solving the radiation or diffraction problems caused by a ship or ocean structure oscillating on the waves. In the context of inviscid potential flow, hydrodynamic problems such as multi-body interaction and tank side wall effect cannot be properly dealt with based on the traditional free-surface frequency domain Green function method, in which the water viscosity is omitted and the energy dissipation effect is absent. In this paper, an open-sea Green function with viscous dissipation was presented within the theory ofvisco-potential flow. Then the tank Green function with a partial reflection from the side walls in wave tanks was formulated as a formal sum of open-sea Green functions representing the infinite images between two parallel side walls of the source in the tank. The new far-field characteristics of the tank Green function is vitally important fur improving the validity of side-wall effects evaluation, which can be used in supervising the tank model tests.

新型MIL-101(Fe)/BiOBr S型异质催化剂用于高效光催化降解抗生素和还原六价铬:光催化性能分析和光催化机理研究

水污染对生态环境和人类健康造成了巨大危害,特别是水体中抗生素和重金属具有毒性且难生物降解,已经引起科研工作者的广泛关注.传统的水处理技术难以有效地消除这些污染物.近年来,人们致力于开发绿色、低碳且高效的光催化技术用于解决环境污染问题,该技术实现大规模应用的核心在于开发出经济、高效的光催化剂.由于单一半导体光催化材料(如BiOBr)存在一些缺陷(如有限的催化活性位点和光生电子-空穴快速复合等),因此,构建具有可见光响应、高暴露活性位点和强氧化还原能力的异质结特别是新兴的梯(S)型异质结是去除这些污染物的有效策略之一.MIL-101(Fe)是一种新型的可见光驱动的金属-有机配体框架材料,具有强还原活性、高比表面积和较好的可见光吸收能力,因此,将氧化型的Bi OBr与还原型的MIL-101(Fe)进行合理设计,构筑S型异质结,有望开发出高效的催化材料.本文采用溶剂热法成功制备了一种新型的MOF基S型异质结MIL-101(Fe)/BiOBr,用于可见光照射下光催化还原六价铬(Cr(Ⅵ))和降解抗生素恩诺沙星.结果表明,在单一污染物体系中,MIL-101(Fe)/BiOBr可有效还原99.4%的Cr(Ⅵ)和氧化分解84.4%的恩诺沙星.值得注意的是,在Cr(Ⅵ)和恩诺沙星共存的条件下,MIL-101(Fe)/BiOBr对(Cr(Ⅵ))和恩诺沙星的去除效率明显提升,这主要是由于S型催化剂、Cr(Ⅵ)和恩诺沙星之间具有协同效应.MIL-101(Fe)/BiOBr催化剂活性增强的主要因素如下:(1)MIL-101(Fe)提供了大量的活性位点,改善了催化材料的光吸收能力.(2)S型载流子分离路径不但促进了电子和空穴的高效分离,而且增强了体系的氧化还原能力.此外,采用自由基捕获实验、电子自旋共振波谱仪、液相色谱-质谱联用技术以及毒性分析软件,系统分析了光催化反应机理、抗生素分解过程和中间产物的生物毒性.综上,本文提供一种简单有效的策略来构筑高活性的MOF/无机半导体S型异质结材料用于高效净化水体环境.

Protection of rat islet viability following heme oxygenase-1 gene transfection via adenoviral vector in vitro

Objective： To investigate the effect of Heme oxygenase-1 （HO-1） gene transfection on the viability of cultured rat islets, and to explore the potential value of HO-1 gene in islet transplantation. Methods：Recombinant adenovirus vector containing human HO-1 gene（Ad-HO-1 ） or enhanced green fluorescent protein gene（Ad-EGFP） was generated by using AdEasy system respectively. The rat islets were transfected with Ad-HO-1, Ad-EGFP or blank vector and then cultured for 7 days. Transfection was confirmed by expression of EGFP and human HO-1 protein detected by fluorescence photographs and western blot, respectively. The insulin release upon different concentration of glucose stimulation was detected using insulin radioimmunoassay kit, and stimulation index（SI） was calculated. Glucose-stimulated insulin release was used ＇to assess islet viability. Results：Adenovirus vector successfully transferred HO-1 gene to rat islet cells in vitro, and the insulin release upon high level of glucose stimulation and stimulation index （SI） of Ad-HO-1-infected islets were significantly higher than those of Ad-EGFP-infected islets and control islets （P 〈 0.05）. Conclusion： Adenovirus-mediated HO-1 gene transfection is a feasible strategy to confer cytoprotection and therefore protect the viability of cultured rat islets.

New Three-Dimensional Assessment Model and Optimization of Acoustic Positioning System

This paper addresses the problem of assessing and optimizing the acoustic positioning system for underwater target localization with range measurement.We present a new three-dimensional assessment model to evaluate the optimal geometric beacon formation whether meets user requirements.For mathematical tractability,it is assumed that the measurements of the range between the target and beacons are corrupted with white Gaussian noise with variance,which is distance-dependent.Then,the relationship between DOP parameters and positioning accuracy can be derived by adopting dilution of precision(DOP)parameters in the assessment model.In addition,the optimal geometric beacon formation yielding the best performance can be achieved via minimizing the values of geometric dilution of precision(GDOP)in the case where the target position is known and fixed.Next,in order to ensure that the estimated positioning accuracy on the region of interest satisfies the precision required by the user,geometric positioning accuracy(GPA),horizontal positioning accuracy(HPA)and vertical positioning accuracy(VPA)are utilized to assess the optimal geometric beacon formation.Simulation examples are designed to illustrate the exactness of the conclusion.Unlike other work that only uses GDOP to optimize the formation and cannot assess the performance of the specified size,this new three-dimensional assessment model can evaluate the optimal geometric beacon formation for each dimension of any point in three-dimensional space,which can provide guidance to optimize the performance of each specified dimension.

层间化学键合促进二维层状共价有机框架光催化析氢

As an alternative clean energy carrier to replace traditional fossil energy,hydrogen energy has been the focus of numerous studies1.Direct conversion of water into hydrogen becomes a sustainable protocol2,3.Many photocatalysts,including organic and inorganic semiconductors,suffer from problems of narrow light absorption,poor charge separation,and insufficient active site4-6.These factors severely limit their practical applications.

Design,Fabrication and Assembly of the Solar Upper Transition Region Imager(SUTRI)

The Solar Upper Transition Region Imager(SUTRI)focuses on the solar transition region to achieve dynamic imaging observation of the upper transition region.In this paper,we report the optical system design,mechanical design,ultrasmooth mirror manufacture and measurement,EUV multilayer film coating,prelaunch installation and calibration for the SUTRI payload at IPOE,Tongji University.Finally,the SUTRI carried by the SATech-01 satellite was successfully set to launch.All functions of this telescope were normal,and the observation results obtained in orbit were consistent with the design.

漂浮型Bi_(2)WO_(6)/C_(3)N_(4)/碳布S型异质结光催化材料用于高效净化水体环境

近年来,水污染成为人类生存面临的巨大危机,如何治理水污染,特别是如何有效去除水体中的抗生素和重金属存在着很多挑战.采用先进、绿色且高效的光催化技术可有效去除水污染,因而受到科研工作者的广泛关注,但粉末状光催化剂易团聚、难分离回收等问题限制了其工业应用.近年来,人们发现将粉末状光催化剂固定在柔性大表面积且电荷传导性能良好的碳布上可以有效克服上述缺点.g-C_(3)N_(4)具有高光还原活性、高稳定性和低成本的优点,因而在环境净化领域具有突出的应用潜力.但单一组分的C_(3)N_(4)/碳布仍存在氧化能力弱、光生载流子分离效率低等问题.将其与高光催化氧化活性且能带位置匹配的Bi_(2)WO_(6)共同构筑具有强内建电场和保留最大氧化还原能力的S型异质结,是一种有效策略,有望开发出高效、可回收的可见光光催化体系.本文以柔性、大的碳布为基底,通过热聚合-溶剂热法将C_3N4和富含氧空位的Bi_(2)WO_(6)原位生长在碳纤维上,制备出了富含氧空位的S型Bi_(2)WO_(6)C_(3)N_(4)/CF布状光催化剂,并用于可见光照射下高效光催化降解抗生素和还原Cr(VI).宏观图像、X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)和傅里叶红外光谱(FTIR)等结果表明,富含氧空位的Bi_(2)WO_(6)和C_(3)N_(4)纳米片均匀地生长在碳纤维上形成了2D/2D/1D分级易回收的布状结构.X射线光电子能谱(XPS)结果表明了Bi_(2)WO_(6)上氧空位、低价氧化态Bi^((3-x)+)和W^((5-x)+)的生成.与C_(3)N_(4)/CF(Bi_(2)WO_(6)CF)相比,Bi_(2)WO_(6)C_(3)N_(4)/CF在可见光照射下的光催化降解盐酸四环素和还原六价铬的效率分别提高了0.5(1.1)倍和30.2(19.8)倍.系统实验证明Bi_(2)WO_(6)C_(3)N_(4)/CF布状光催化剂较好的光催化性能归因于三个方面:(1)碳纤维编织而成的分级Bi_(2)WO_(6)C_(3)N_(4)/CF布结构可以暴露丰富的活性位点、促进污染物的富集以及加强界面电荷转移和空间分离;(2)缺陷工程协同S型光生载流子分离路径促进了电子和空穴的高效分离;(3)柔性可漂浮的布状结构赋予了其良好的易回收性和可循环利用性.此外,该布状光催化剂具有较好的环境普适性和毒性缓释作用,可以在不同影响因素下保持良好的光催化活性且降解中间产物毒性减弱.XPS结果中电子结合能的变化和功函数分析进一步确认了其S型光生载流子分离路径,并通过自由基捕获实验和电子自旋共振波谱仪系统研究了光催化反应机理:Bi_(2)WO_(6)C_(3)N_(4)/CF布状光催化剂通过S型光生载流子分离路径促进了超氧自由基和羟基自由基的生成,在降解盐酸四环素的过程中空穴和超氧自由基为主要活性物种,而在还原六价铬过程中电子和超氧自由基为主要活性基团.综上,本文采用缺陷工程结合碳布基底的S型异质结构筑策略,开发出高性能、易回收、稳定的漂浮型光催化体系,为高效净化水体环境提供了新思路.