摘要：TiO_(2)is a promising photocatalyst with limited use in practical applications owing to its wide bandgap,narrow light response range,and rapid recombination of photoexcited *** address these limitations,a novel 1D/2D TiO_(2)/ZnIn_(2)s_(4)heterostructure was designed according to the principles of the s-scheme *** TiO_(2)/ZnIn_(2)s_(4)(TZIsx)hybrids prepared via a hydrothermal method afforded significant improvement in photocatalytic hydrogen evolution(PHE)in comparison to pristine TiO_(2)and ZnIn_(2)s_(4).In particular,the optimal TZIs2 sample(mass ratio of ZnIn_(2)s_(4)to TiO_(2)was 0.4)exhibited the highest PHE activity(6.03 mmol/h/g),which was approximately 3.7 and 2.0 times higher than those of pristine TiO_(2)and ZnIn_(2)s_(4),*** improvement in the PHE of the TZIs2 sample could be attributed to the formation of an intimate heterojunction interface,high-efficiency separation of charge carriers,abundant reactive sites,and enhanced light absorption ***,theoretical and experimental results demonstrated that the s-scheme mechanism of interfacial electron transfer in the TZIsx composites facilitated the transfer and separation of photoexcited charge carriers,resulting in more isolated photoexcited electrons for the PHE reaction.

摘要：An s-scheme heterojunction photocatalyst is capable of boosting photogenerated carrier separation and transfer,thus maintaining high photooxidation and photoredox ***,a 0D Ag_(3)PO_(4) nanoparticles(NPs)/1D TiO_(2) nanofibers(NFs)s-scheme heterojunction with intimate interfacial contact was designed via the the hydro-thermal *** from the abundant hydroxyl groups and size confinement effect of TiO_(2) NFs,the average diameter of the Ag_(3)PO_(4) nanoparticles decreased from 100 to 22 nm,which favored the construction of a 0D/1D geometry *** multifunctional Ag_(3)PO_(4)/TiO_(2) sample exhibited excellent photocatalytic activity and stability in photocatalytic oxygen production(726μmol/g/h)and photocatalytic degradation of various organic contaminants such as rhodamine B(100%),phenol(60%)and tetracycline hydrochloride(100%).The significant improvements in the photocatalytic performance and stability can be attributed to the intimate interfacial contacts and rich active sites of 0D/1D geometry,fast charge carrier migration,and outstanding photoredox properties induced by the s-scheme charge-transfer *** work offers a promising strategy for constructing 0D/1D s-scheme heterojunction photocatalysts for improved photocatalytic performance.

摘要：step-scheme(s-scheme)heterojunctions in photocatalysts can provide novel and practical insight on promoting photogenerated carrier *** latter is critical in controlling the overall efficiency in one-step photoexcitation *** this study,a nanosized BiVO4/Bi0.6Y0.4VO4 solid solution was prepared by a coprecipitation method following with hydrothermal or calcination *** s-scheme heterojunction was fabricated by in-situ pressure-induced transformations of bismuth vanadate from the tetragonal zircon phase to the monoclinic scheelite phase,which led to the formation of BiVO4 nanoparticles with a diameter of approximately 5 nm on the surface of BiVO_(4)/Bi_(0.6)Y_(0.4)VO_(4)/Bi_(0.6)Y_(0.4)VO_(4) with s-scheme heterojunctions showed significantly enhanced photocatalytic overall water splitting activity compared with using bare BiVO_(4)/Bi_(0.6)Y_(0.4)VO_(4).Characterization of the carrier dynamics demonstrated that a superior carrier separation through s-type heterojunctions might have caused the enhanced overall water splitting(OWs)*** photovoltage spectra and the results of selective photodeposition experiments indicated that the photogenerated holes mainly migrated to the BiVO4 nanoparticles in the *** confirmed that the charge transfer route corresponds to an s-scheme rather than a type-II heterojunction mechanism under light *** study presents a facile and efficient strategy to construct s-scheme heterojunctions through a pressure-induced phase *** results demonstrated that s-scheme junctions composed of different crystalline phases can boost the carrier separation capacity and eventually improve the photocatalytic OWs activity.

摘要：在过去几十年中,将二氧化碳光还原转化为有用的化学燃料(甲烷、一氧化碳和甲醇等)受到了极大的关注.然而,由于光生电荷的复合速度快,二氧化碳和水分子的共吸附不足,目前的二氧化碳光还原系统的效率还远远不能令人满意.本文报道了在疏水碳纤维纸上构建一个紧密的二维/二维石墨相氮化碳@碘氧铋梯型(s型)异质结,用于高效的二氧化碳光还原.所制备的异质结具有良好的一氧化碳选择性(77.8%)和活性(458.0μmol h^(-1)m^(-2)).良好的光催化性能归因于良好设计的s型异质结结构,提高了电荷分离效率,以及形成了气-液-固三相界面,充分保证了二氧化碳和水的同时供给.这项工作为高效光催化二氧化碳还原系统的设计提供了新思路.

摘要：石墨炔由于其高载流子迁移率和有序的孔隙结构被认为是一种很有应用前景的光催化材料.本研究通过交叉偶联合成了一种新型球状石墨炔,并与棒状Mn_(0.2)Cd_(0.8)s耦合构建了s型异质结用于光催化析氢.结果表明,Mn_(0.2)Cd_(0.8)s/石墨炔异质结光催化剂表现出优异的光催化活性,产氢性能分别较Mn_(0.2)Cd_(0.8)s和球形石墨炔单体催化剂提升了16.78和613.2倍.同时,该催化剂应用于平米级规模产氢取得较好效果.其优异的光催化活性可归因于石墨炔的独特性能及s-scheme异质结的有效构建.通过紫外光电子能谱、原位辐射X射线光电子能谱、电子顺磁共振能谱、密度泛函理论计算和其他表征技术探究了s-scheme异质结的形成和光催化活性的增强.该工作可为石墨炔的形貌可调性制备以及高效异质结光催化剂的设计和合成提供新参考.

摘要：光热催化降解去除污染物对解决环境问题具有独特的优势.本文通过水热法结合超声处理的方法合成了BiVO4/CoPc s型异质结光热催化材料.实验结果表明,BVO-1%CoPc在10分钟内对四环素对降解率可达76%,相比钒酸铋单质提高了1.8倍.进一步的红外热成像仪表明酞菁钴(CoPc)的光热效应可以提高反应体系的温度.同时,研究人员还发现降解后的中间产物毒性显著降低.光致发光光谱的结果表明,合成的复合材料可以增强光生载流子的分离能力.基于捕获实验、能带结构和原位XPs等研究结果,我们提出了光生电荷在合成的催化剂中的s型传输机制.本工作为设计和开发用于去除有机污染物的s型光热催化材料提供了一种可行的策略.

摘要：Constructing a suitable heterojunction photocatalytic system from two photocatalytic materials is an efficient approach for designing extremely efficient photocatalysts for a broader range of environmental,medical,and energy ***,the construction of a step-scheme heterostructure system(hereafter called the s-scheme)has received widespread attention in the photocatalytic field due to its ability to achieve efficient photogenerated carrier separation and obtain strong photo-redox ***,a novel s-scheme heterojunction system consisting of 2D O-doped g-C_(3)N_(4)(OCN)nanosheets and 3D N-doped Nb_(2)O_(5)/C(N-NBO/C)nanoflowers is constructed via ultrasonication and vigorous agitation technique followed by heat treatment for the photocatalytic degradation of Rhodamine B(RhB).Detailed characterization and decomposition behaviour of RhB showed that the fabricated material shows excellent photocatalytic efficiency and stability towards RhB photodegradation under visible-light *** enhanced performance could be attributed to the following factors:fast charge transfer,highly-efficient charge separation,extended lifetime of photoinduced charge carriers,and the high redox capability of the photoinduced charges in the s-scheme *** trapping experiment conditions and electron paramagnetic resonance provide clear evidence of the s-scheme photogenerated charge transfer path,meanwhile,the RhB mineralization degradation pathway was also investigated using *** study presents an approach to constructing Nb_(2)O_(5)-based s-scheme heterojunctions for photocatalytic applications.

摘要：To improve separation efficiency of the photogenerated electron-hole pairs,constructing a heterojunction is considered to be a promising ***,the fabrication of heterojunction via a facile route to achieve a substantial improvement in photocatalytic performance is still *** this work,a well-designed nanosheet-based rodlike step-scheme(s-scheme)heterojunction Bi_(4)O_(5)I_(2)/Bi_(4)O_(5)Br_(2) with rich oxygen vacancies(OVs)(Bi_(4)O_(5)I_(2)/Bi_(4)O_(5)Br_(2)-OV)was easily synthesized by calcining BiOAc0.6Br0.2I0.2(Ac-=CH3 COO-)*** as-prepared Bi4O5I2/Bi4O5Br2-OV exhibited excellent visible light photocatalytic performance towards antibiotic tetracycline(TC)and dye rhodamine B(Rh B)degradation and removal rate reached 90.2% and 97.0%within 120 min,respectively,which was higher than those of Bi4O5I2-OV(56.8% and 71.8%),Bi4O5Br2-OV(47.4%and 68.4%),solid solution BiOAc0.6Br0.2I0.2(67.0% and 84.0%)and Bi_(4)O_(5)I_(2)/Bi_(4)O_(5)Br_(2) with poor oxygen vacancies(Bi4O5I2/Bi4O5Br2-P)(30.6%and 40.4%).Owing to the release of heat and generation of reducing carbon during calcining the precursor with Ac-,it could not only reduce the generation temperature of Bi-rich bismuth oxyhalides,which thus decreased particle size and increased surface areas,but also introduce surface OVs,which could trap photoelectrons and inhibit the recombination of *** addition,the calcination of single solid solution precursor benefited to the formation of well-alloyed interfaces with larger contact areas between 2D/2D nanosheet-like materials,which facilitates charge carriers transfer at the *** Bi4O5I2/Bi4O5Br2-OV also shows the desirable removal rate for TC and Rh B in actual wastewater or in the presence of some *** study provides an effective and simple strategy for designing OVs modified Bi-rich oxyhalides heterojunctions.