Silicon carbide (SiC) ceramic membranes are renowned for their excellent properties, finding extensive applications across various fields. However, achieving a balance between porosity and strength poses a persistent challenge. This study uses a freeze-drying method to prepare a silica sol-starch composite xerogel as a pore-forming agent. The structural stability of the composite xerogel plays a critical role in supporting the pore structure during pressing, thus enhancing porosity and achieving a homogeneous microstructure. At approximately 1400 degrees C, carbon derived from the starch carbonizes and reacts with SiO2 in the pore-forming agent via a carbothermal reduction, generating fine SiC particles. These particles further undergo recrystallization among the starting SiC particles, forming uniform pore structures to improve open porosity and robust sintering necks. With the pore-forming agent's dosage optimized to 15 %, the resulting high open porosity of 55.6 %, enhanced permeability, and improved mechanical strength of 54.9 MPa.

Cu-Mn co-doped CeO2 photocatalyst was successfully synthesized by the sol-gel method to assess its capability in degrading tetracycline.XRD and TEM results showed that Cu and Mn were successfully co-doped into CeO2 without forming heterostructure,XPS and photoelectrochemical results revealed that Mn ions doping amplified the generation of photo-induced charge carriers,while Cu ions doping significantly facilitated the interfacial charge transfer process.Notably,the optimized Cu3Mn2CeO2 nanoparticles exhibited the highest TC removal efficiency,achieved a rate of 78.18%and maintained a stable cycling performance.

A SrTiO3@SiC photocatalytic ceramic membrane with hierarchical pores was fabricated via hydrothermal in-situ growth optimized by ethylene glycol, providing strong interfacial bonding for enhanced durability and photo-catalytic performance. During filtration, the flux initially declined due to tetracycline accumulation but was fully restored after visible-light irradiation. The membrane achieved 96.54 % tetracycline removal with a flux of 8.63 L center dot m-2 center dot h-1and 98.52 % flux recovery through synergistic membrane separation and photocatalytic degradation, where superoxide radicals (center dot O2-) and holes (h+) mineralized pollutants and prevented fouling. This integration of separation and photocatalysis enables effective pollutant mineralization and in-situ membrane self-cleaning, offering a sustainable, chemical-free approach for antibiotic wastewater treatment and advancing environmental remediation technologies.

Overcoming the challenges associated with achieving high uniformity and connectivity of pore channels in ceramic membranes, we designed silicon carbide ceramic membrane derived from the recrystallization process based on the Dinger-Funk equation of the closest -packing model with various grain grading. Furthermore, the effects of particle size distribution on the resulting microstructure and pore architecture of the ceramic membrane was also explored. The findings corroborated the critical importance of raw material particle size distribution in controlling pore size distribution and morphology. After sintering at 1900 degrees C, the silicon carbide ceramic membrane, benefiting from ideal particle packing, exhibited a remarkably uniform pore structure. Notably, the most probable pore size constituted over 70 %, while achieving an open porosity of 51.3 % even without the addition of pore -forming agents. The silicon carbide ceramic membrane also demonstrated exceptional hydrophilicity (water contact angle:-0 degrees), impressive water permeation (1210 L m-2 h-1 & sdot;bar- 1), coupled with efficient turbidity removal (-100 %) in carbon black wastewater treatment applications. Additionally, membrane regeneration proved effective using a dilute NaOH solution backwash, achieving a flux recovery efficiency of 98 %. This strategy had directive significance for designing high -performing silicon carbide ceramic membranes.

市售的工业级SiC粉体形貌不规整,粒径分布宽,烧结的SiC多孔陶瓷的孔径分布不集中.以市售工业级SiC粉体(500目)为原料,采用高温法对SiC粉体进行预处理,然后采用预处理粉体、未经预处理粉体、微粉重结晶烧结SiC多孔陶瓷.系统研究了原料预处理工艺和烧结温度对多孔SiC陶瓷微观结构、力学性能、开孔孔隙率和孔径分布等性能的影响.结果表明:表面扩散作用使得预处理后的SiC粉体的粒度分布窄、流动性更好.制备的SiC多孔陶瓷的孔径分布比更均匀,强度更高.最佳工艺为:1750℃预处理后的粉体掺入30％10000目微粉经2250℃重结晶烧结.烧结的SiC多孔陶瓷开孔率为33.02％,平均孔径为3.02μm,弯曲强度达到115.08 MPa.

翻译是通过两种语言的转换,传递文化的过程.随着经济全球化进一步加深,翻译作为跨文化交际的桥梁,起着越来越重要的作用.由于中英文属于不同的语系,中西文化差异明显,了解掌握英汉差异是翻译的必经阶段.汉语习语是中国传统文化的重要组成部分,带有浓厚的民族色彩和鲜明的文化内涵,翻译起来具有一定难度.该文通过分析中英文化差异,结合汉语习语英译实例,简要总结汉语习语的英译策略.

根据Furnas模型理论,研究了两种粒径颗粒的级配对SiC陶瓷膜孔径大小及其纯水通量的影响.研究结果表明,细颗粒含量≤40％时,随着细颗粒含量的增加,粗细颗粒之间形成的烧结颈增多,粗颗粒与粗颗粒之间的间隙减小,使得粗颗粒堆积形成的陶瓷膜骨架更加密实,SiC陶瓷膜的孔径减小;经1900℃烧结后,当细粗颗粒含量比例为4:6时SiC陶瓷膜的孔径较小,为0.699μm,能有效分离乳化油油水.