g-C3N4/CeO2异质结材料的制备及其光催化性能的研究

以三聚氰胺、硝酸铈为原料,通过高温煅烧法制备了不同CeO₂含量的片层状g-C₃N₄/CeO₂,通过XRD、FT-IR、XPS等对系列g-C₃N₄-CeO₂材料进行了表征,考察了材料在可见光(λ≥420nm)条件下降解盐酸四环素(TC)的光催化活性。与单纯的g-C₃N₄相比,g-C₃N₄/CeO₂-30%具有更优异的光催化性能,这是由于g-C₃N₄-CeO₂间的异质结作用促进了光生电子和空穴分离。自由基捕获实验证实·O^-₂在催化反应过程中起到主要作用,并提出了相应的光催化机理。     

花状Cu2O/Cu的水热合成及其光催化性能

以硝酸铜为前驱体, 不采用任何模板, 通过逐步水热法合成了花状Cu2O/Cu复合纳米材料. 用扫描电镜(SEM)、X射线衍射(XRD)和紫外-可见漫反射光谱(DRS)对样品进行表征. 结果表明, 花状纳米Cu2O/Cu材料是由长为300-500 nm, 宽为30-70 nm的带状花瓣构成, 在可见光区域有很强的吸收. 复合材料中Cu的含量可以通过反应时间进行调控. 对染料Procion Red MX-5B(PR)的可见光催化降解, Cu能明显提高Cu2O的光催化性能. 当Cu质量分数为27%-71%时, 复合材料Cu2O/Cu的催化活性明显高于单相Cu2O. 与立方体形貌的Cu2O/Cu复合材料相比, 花状纳米Cu2O/Cu复合材料对染料PR有更高的催化降解性能. 且该复合材料有较高的循环回收利用率.     

异质型BiOI/NaBiO_3光催化剂的合成及其光催化性能

根据表面化学蚀刻原理采用加热冷凝回流的方法制备了一系列组成的异质结构BiOI/NaBiO3光催化剂。利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和紫外-可见漫反射光谱(UV-Vis-DRS)等技术对其晶相结构、微观形貌和光吸收性能进行了表征。光催化实验表明,BiOI/NaBiO3在可见光下可以有效降解罗丹明B(RhB),当BiOI与NaBiO3的物质的量分数为一定值时,异质结构的光催化剂明显优于单一组分的光催化活性。通过加入不同的牺牲剂及荧光实验结果推测了该异质结构材料的光催化机理,并且分析了其光生载流子的传输方向及光催化过程的活性物种。研究表明,BiOI/NaBiO3的催化活性增强主要归结为两者之间形成了有效的异质结构,其内建电场能够促进光生载流子的分离,同时光生空穴h+在光催化降解过程中是主要的活性物种。     

2D/3D ZnIn2S4/TiO2复合物的原位构筑及其提高的光催化性能

通过高温煅烧和油浴的方法构筑二维/三维(2D/3D) ZnIn₂S₄/TiO₂异质结, 应用于光催化降解罗丹明B (RhB)和四环素(TC), 来研究异质结的构筑对TiO₂可见光响应范围和光生载流子对分离效率的影响. 结果表明, TiO₂维持了MOFs的形貌, 显示窄的可见光响应范围和高的光生电荷复合率, 与ZnIn₂S₄纳米片复合后, TiO₂的比表面积增大, 光催化活性位点增多. 带隙宽度也由TiO₂的3.23 eV减小到ZnIn₂S₄/TiO₂-II的2.52 eV, 从而获得了更宽的可见光响应范围. 能带结构表明ZnIn₂S₄/TiO₂是type II型异质结, 提高了光生载流子对的分离与转移效率. 在可见光照射下, ZnIn₂S₄/TiO₂-II显示了最高的RhB光催化降解效率(93%), 分别是TiO₂和ZnIn₂S₄的18和2倍. 同时, ZnIn₂S₄/TiO₂-II也显示出比TiO₂和ZnIn₂S₄更高的TC降解效率(90%). 循环实验表明ZnIn₂S₄/TiO₂-II能保持良好的稳定性, 经5次循环实验后仍能降解83%的RhB. 研究表明基于MOFs衍生的TiO₂构筑2D/3D ZnIn₂S₄/TiO₂异质结是提高TiO₂光催化性能的一条有效途径.     

YFeO3/TiO2异质结材料的制备及其光催化性能研究

通过研磨-焙烧法制备了YFeO3/TiO2异质结材料,考察了焙烧温度和组分质量含量变化对合成异质结材料的影响;进行了X射线衍射(XRD)、傅里叶红外(FRIR)、紫外-可见漫反射(UV-vis/DRS)、光电子能谱(XPS)等表征并测试了不同样品光催化降解橙黄Ⅱ的活性.结果表明,YFeO3/TiO2复合氧化物不仅具有明显的可见光光响应,而且表现出比单组分相对较高的光催化降解活性.最佳的复合样品为600℃焙烧下,w(TiO2)=0.9的复合样品.复合材料光催化活性的提高可归因于p-YFeO3与n-TiO2间存在的p-n结.     

CeO2/γ-Al2O3复合材料制备及其光催化性能研究

以Ce(NO₃)₃·6H₂O及Al(NO₃)₃·9H₂O为原料,NH₄HCO₃为造孔剂,以沉淀法制备了具有介孔结构的CeO₂/γ-Al₂O₃光催化材料。研究了不同NH₄∶Al及Ce∶Al摩尔比等条件下制备CeO₂/γ-Al₂O₃样品的光催化性能。结果表明,所制备CeO₂/γ-Al₂O₃复合材料具有优异的光催化性能,最佳NH₄∶Al及Ce∶Al摩尔比分别为1及0.2,该条件下制备的样品BET比表面积为94.4642 m²·g^-1,孔径为5.8565 nm,对亚甲基蓝(MB)的光催化降解率可达93.59%,动力学常数k为0.0218 m...     

不同煅烧温度制备的n-p型CeO_2/BiOBr光催化性能研究

采用微乳法制备了n-p型CeO_2/BiOBr异质结,其中十六烷基三甲基溴化铵(CTAB)既作为Br源,又作为"桥"使CTA~+修饰在CeO_2表面形成了稳定的油包水微乳体系.利用XRD、SEM、HRTEM、UV-Vis DRS、BET、XPS等对样品进行结构、形貌和光学性质进行表征,并对复合光催化剂进行了可见光下降解甲基橙(MO)的光催化活性研究.考察了不同煅烧温度对合成CeO_2/BiOBr的影响.结果表明:CeO_2/BiOBr异质结相比于单体CeO_2和BiOBr来说,它的光响应范围大大增加,在可见光下降解MO具有更高的光催化活性.450℃下煅烧可使MO达到最佳的降解率,而高温则会使催化剂发生烧结.机理研究表明,在CeO_2与BiOBr复合体中,使有机物矿化的主要为CeO_2价带上的光生空穴.CeO_2/BiOBr催化活性增强主要是由于在CeO_2与BiOBr之间形成了n-p型的异质结.     

异质型BiOI/NaBiO3光催化剂的合成及其光催化性能

根据表面化学蚀刻原理采用加热冷凝回流的方法制备了一系列组成的异质结构BiOI/NaBiO₃光催化剂.利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和紫外-可见漫反射光谱(UV-Vis-DRS)等技术对其晶相结构、微观形貌和光吸收性能进行了表征.光催化实验表明,BiOI/NaBiO₃在可见光下可以有效降解罗丹明B(RhB),当BiOI与NaBiO₃的物质的量分数为一定值时,异质结构的光催化剂明显优于单一组分的光催化活性.通过加入不同的牺牲剂及荧光实验结果推测了该异质结构材料的光催化机理,并且分析了其光生载流子的传输方向及光催化过程的活性物种.研究表明,BiOI/NaBiO₃的催化活性增强主要归结为两者之间形成了有效的异质结构,其内建电场能够促进光生载流子的分离,同时光生空穴h⁺在光催化降解过程中是主要的活性物种.     

TiO_2/Bi_2WO_6纳米异质结的制备及其可见光光催化性能

采用共沉淀法制备了不同Ti/Bi摩尔比的TiO_2/Bi_2WO_6纳米异质结可见光光催化剂.采用XRD、HR-TEM、XPS及UV-vis DRS测试技术对样品的晶相结构、微观形貌、组成及吸光性能等进行了表征分析.以MB模拟环境污染物,考察了TiO_2/Bi_2WO_6纳米异质结的可见光光催化活性.结果表明,当热处理温度为700℃,n(Ti)∶n(Bi)的比值为1∶5.4,可见光照射180 min时,TiO_2/Bi_2WO_6纳米异质结对MB的降解率达80.0%,是纯Bi_2WO_6的12倍.光催化活性的提高可归因于TiO_2与Bi_2WO_6复合后可以产生能带交叠效应,从而促进光生电子-空穴对的有效分离.     

CeO2/TiO2复合纳米纤维的制备及光催化性能研究

采用静电纺丝技术和水热合成法制备了CeO₂/TiO₂复合纳米纤维. 利用X射线衍射(XRD)、拉曼光谱(Raman)、扫描电镜(SEM)、透射电镜(TEM)和比表面积测定(BET)等分析测试手段对样品的形貌及结构进行了表征, 并以罗丹明B的脱色降解为模式反应, 考察了样品的光催化性能. 结果表明: CeO₂纳米粒子均匀地生长在TiO₂纳米纤维表面, 形成了异质结构的CeO₂/TiO₂复合纳米纤维光催化材料. 通过改变碱源, 可以得到不同形貌的CeO₂. CeO₂的存在增加了TiO₂纳米纤维的比表面积, 有效地实现TiO₂光生电子和空穴的分离, 增强了体系的量子效率, 与纯TiO₂纳米纤维相比光催化活性明显提高. 初步探讨了异质结的形成机理.     

NiFe2O4/g-C3N4 heterojunction composite with enhanced visible-light photocatalytic activity

Spinel structure nickel ferrite (NiFe₂O₄) doped graphitic carbon nitride (g-C₃N₄) photocatalyst NiFe₂O₄/g-C₃N₄ was synthesized by the coprecipitation route to enhance the photocatalytic activity for the visible-light driven degradation of methyl orange. The NiFe₂O₄ doping content is responsible for the microstructure and photocatalytic activity of NiFe₂O₄/g-C₃N₄ samples. Compared with pure NiFe₂O₄ and g-C₃N₄, the 2-NiFe₂O₄/g-C₃N₄ composite with NiFe₂O₄ doping of 2.0 wt% exhibited excellent photocatalytic activity and superior stability after five runs for degrading methyl orange under visible light irradiation. The catalytic activity of 2-NiFe₂O₄/g-C₃N₄ sample produced using the coprecipitation route was higher than those of conventional 2-NiFe₂O₄/g-C₃N₄ bulks prepared by the impregnation approach. The prepared samples for the photocatalytic degradation of methyl orange followed pseudo-first-order reaction kinetics. It’s ascribed to the synergistic effect between NiFe₂O₄ and g-C₃N₄, which can inhibit the recombination of photoexcited electron-hole pairs, accelerate photoproduced charges separation, and enhance the visible light absorption.     

原位合成具有高可见光催化活性的C3N4/CdS纳米复合材料

以硫氰酸铵和氯化镉为原料,采用无模板混合高温煅烧法一步合成氮化碳/硫化镉纳米晶(C3N4/CdS)的复合半导体材料。采用X射线衍射、傅立叶变换红外光谱和透射电镜等技术对其结构和形貌进行了表征。以有机污染物罗丹明B (RhB)为模拟污染物对复合催化剂的可见光催化活性进行测试。结果表明, C3N4/CdS复合材料中CdS以六方相纳米晶的形式均匀分散; CdS的复合基本不改变C3N4主体结构及聚合度;与纯C3N4相比,复合材料在可见区的光吸收能力有所增强。合适的能带匹配有利于光生载流子的迁移,抑制了其复合速率。在可见光照射下,复合半导体能够更加快速的降解有机污染物,且保持很好的稳定性。     

Construction of 2D-2D TiO2 nanosheet/layered WS2 heterojunctions with enhanced visible-light-responsive photocatalytic activity

Constructing nanocomposites that combine the advantages of composite materials, nanomaterials, and interfaces has been regarded as an important strategy to improve the photocatalytic activity of TiO₂. In this study, 2D-2D TiO₂ nanosheet/layered WS₂ (TNS/WS₂) heterojunctions were prepared via a hydrothermal method. The structure and morphology of the photocatalysts were systematically characterized. Layered WS₂ (～4 layers) was wrapped on the surface of TiO₂ nanosheets with a plate-to-plate stacked structure and connected with each other by W=O bonds. The as-prepared TNS/WS₂ heterojunctions showed higher photocatalytic activity for the degradation of RhB under visible-light irradiation, than pristine TiO₂ nanosheets and layered WS₂. The improvement of photocatalytic activity was primarily attributed to enhanced charge separation efficiency, which originated from the perfect 2D-2D nanointerfaces and intimate interfacial contacts between TiO₂ nanosheets and layered WS₂. Based on experimental results, a double-transfer photocatalytic mechanism for the TNS/WS₂ heterojunctions was proposed and discussed. This work provides new insights for synthesizing highly efficient and environmentally stable photocatalysts by engineering the surface heterojunctions.     

Ag2S/Ag2WO4微米棒的声化学合成、表征及其高光催化性能

TiO2作为一种光催化剂广泛应用于各种污染物的降解.但是它较大的宽禁带(~3.2 eV)导致其很难吸收可见光,因此寻找窄禁带的具有可见光响应的半导体光催化剂成为近年来光催化研究的热点.在众多窄禁带光催化剂中,纯 Ag2S在降解污染物方面并不出色,但是作为一种窄禁带的直接带隙半导体,它在加快电子迁移和提高光量子效率方面表现出色.目前有许多高催化活性的 Ag2S异质结复合半导体光催化剂的报道,如 Ag2Mo3O10-Ag2S, TiO2-Ag2S, ZnS-Ag2S和NiO-Ag2S等. Ag2WO4是一种具有新颖物理化学性质的半导体材料,在催化、传感器、抗菌和光致发光等方面有着广泛应用.但是, Ag2WO4的理论带隙较宽,约为3.5 eV,而且光照下Ag2WO4很容易产生光化学腐蚀而分解出单质银,作为光催化剂存在太阳光利用率低和稳定性较差等缺点.声化学是一种特殊纳米材料的合成方法.它主要是利用超声空化产生特殊的物理化学环境来强化化学键的生成,同时实现半导体从无定形态到固定晶型转变.本文采用超声辅助共沉淀法制备了长为0.2?1μm、直径为20?30 nm的 Ag2S/Ag2WO4微米棒复合光催化剂.利用 X射线衍射(XRD)、N2物理吸附、扫描电镜、透射电镜、光电子能谱、光致发光谱(PL)和紫外-可见漫反射吸收光谱(UV-vis DRS)和光电流等手段对所制 Ag2S, Ag2WO4和 Ag2S/Ag2WO4进行了表征.结果表明,合成的样品比表面积较小(2.7?3.6 m2/g). UV-vis DRS测试表明,声化学处理能有效拓宽 Ag2S/Ag2WO4在可见光区的吸收范围,提高其可见光响应性能.另外, PL和光电流测试结果证实,在声化学制备的 Ag2S/Ag2WO4体系中,光生电子(e?)-空穴(h+)的复合过程被极大地限制,具有较高的 e?-h+分离效率.以金卤灯为光源进行了光催化降解染料亚甲基蓝的性能测试.结果表明,声化学合成的 Ag2S/Ag2WO4的反应速率常数(0.150 min?1)分别为单纯 Ag2WO4(0.031 min?1)和 Ag2S (0.004 min?1)的4.7和29.8倍.自由基捕获实验表明,在 Ag2S/Ag2WO4光催化降解甲基橙过程中主要的活性物种为超氧自由基(?O2?)和光生空穴(h+).此外,声化学合成的 Ag2S/Ag2WO4表现出很好的光催化稳定性.循环使用3次后,该样品对亚甲基蓝的光催化活性仍高达80.4%,而纯 Ag2WO4几乎完全失活. Ag2S/Ag2WO4具有很高的光催化活性的原因,一方面是声化学处理提高了催化剂的结晶度,同时生成了独特的棒状结构;另一方面是在超声作用下, Ag2S和 Ag2WO4两相紧密接触形成异质结,促进了可见光的吸收和光生 e?与 h+的分离.     

原位合成具有高可见光催化活性的C3N4/CdS纳米复合材料

以硫氰酸铵和氯化镉为原料,采用无模板混合高温煅烧法一步合成氮化碳/硫化镉纳米晶(C3N4/CdS)的复合半导体材料。采用X射线衍射、傅立叶变换红外光谱和透射电镜等技术对其结构和形貌进行了表征。以有机污染物罗丹明B (RhB)为模拟污染物对复合催化剂的可见光催化活性进行测试。结果表明, C3N4/CdS复合材料中CdS以六方相纳米晶的形式均匀分散; CdS的复合基本不改变C3N4主体结构及聚合度;与纯C3N4相比,复合材料在可见区的光吸收能力有所增强。合适的能带匹配有利于光生载流子的迁移,抑制了其复合速率。在可见光照射下,复合半导体能够更加快速的降解有机污染物,且保持很好的稳定性。     

Hydrothermal synthesis and enhanced photocatalytic activity of mixed-phase TiO2 powders with controllable anatase/rutile ratio

In this study, mixed-phase TiO₂ powders were novelly synthesized via a facile and mild hydrothermal method without any post-heat treatment. TiOSO₄ and peroxide titanic acid (PTA) were used as inorganic titanium sources, while no special solvent or additive were introduced. The XRD and TEM results showed the mixed-phase TiO₂ powders were composed of anatase and rutile phases, and the PTA sol played an important role on forming the rutile nucleus. The proportion of rutile in the mixed-phase TiO₂ could be easily controlled in the range of 0%–70.5% by changing the amount of PTA sol used in the synthesis process. The UV-Visible absorption spectra indicated the prepared mixed-phase TiO₂ showed enhanced visible light absorption with the increase of rutile ratio. The photodegradation experiments revealed the mixed-phase TiO₂ exhibited the best photocatalytic activity at the rutile ratio of 41.5%, while a higher or lower rutile ratio both resulted in the decrease of photocatalytic activity.     

Novel CaCO3/g-C3N4 composites with enhanced charge separation and photocatalytic activity

A novel CaCO₃/graphitic carbon nitride (g-C₃N₄) photocatalyst was synthesized for the first time via a facile calcination method using CaCO₃ and melamine as precursors. The as-prepared samples were characterized using various techniques, such as scanning and transmission electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller analysis, as well as Fourier-transform infrared, X-ray photoelectron, photoluminescence, and UV–vis diffuse reflectance spectroscopy. The results of the experiments confirm the successful coupling of CaCO₃ to g-C₃N₄. The photocatalytic activity of the synthesized CaCO₃/g-C₃N₄ composites was evaluated by assessing their performance in the photocatalytic degradation of crystal violet (CV) in water under visible light irradiation. The analysis shows that CaCO₃/g-C₃N₄ exhibits higher photocatalytic activity towards CV degradation (76.0%) than pristine g-C₃N₄ (21.6%) and CaCO₃ (23.2%). Radical trapping and electron spin resonance experiments show that hydroxyl radicals (OH) and holes (h⁺) are the key reactive species in the photocatalytic process. The enhanced photocatalytic activity of the composite is mainly attributed to the efficient separation rate of electron-hole pairs achieved through the incorporation of CaCO₃.     

Synthesis of ZnTiO3/tourmaline/Ni foam catalyst and enhanced photocatalytic performance

ZnTiO₃/tourmaline loaded on the nickel foam (ZnTiO₃/tourmaline/Ni-foam) is prepared by a facile coating method. Morphology and structure of the photocatalyst were characterized by X-ray diffraction (XRD), scanning electrons microscopy (SEM), raman spectroscopy, UV–vis diffuse reflectance spectrum (UV–vis DRS) and photoluminescence spectroscopy (PL). The photocatalytic properties of the materials were tested by using the Rhodamine B (RhB) solution as the target pollutant. The results indicates that the ZnTiO₃/tourmaline/Ni foam exhibited higher photocatalytic activity than that of ZnTiO₃ and ZnTiO₃/Ni foam under ultraviolet (UV) light irradiation, and its degradation rate was up to 99.2%. Moreover, the degradation rate remained at 91.3% after eight consecutive photocatalytic reaction cycles. The outstanding photocatalytic performances of ZnTiO₃/tourmaline/Ni foam was mainly attributed to the existence of tourmaline, which can help to inhibit the recombination of electron-hole paris, and the proper pore structure of the carrier. Meanwhile, the trapping experiments indicated that ·O₂^– was the main active species in the photocatalytic degradation of RhB.     

Preparation of Z-scheme WO3(H2O)0.333/Ag3PO4 composites with enhanced photocatalytic activity and durability

Ag₃PO₄ is widely used in the field of photocatalysis because of its unique activity. However, photocorrosion limits its practical application. Therefore, it is very urgent to find a solution to improve the light corrosion resistance of Ag₃PO₄. Herein, the Z-scheme WO₃(H₂O)_0.333/Ag₃PO₄ composites are successfully prepared through microwave hydrothermal and simple stirring. The WO₃(H₂O)_0.333/Ag₃PO₄ composites are characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and UV-Vis spectroscopy. In the degradation of organic pollutants, WO₃(H₂O)_0.333/Ag₃PO₄ composites exhibit excellent performance under visible light. This is mainly attributed to the synergy of WO₃(H₂O)_0.333 and Ag₃PO₄. Especially, the photocatalytic activity of 15%WO₃(H₂O)_0.333/Ag₃PO₄ is the highest, and the methylene blue can be completely degraded in 4 min. In addition, the stability of the composites is also greatly enhanced. After five cycles of testing, the photocatalytic activity of 15%WO₃(H₂O)_0.333/Ag₃PO₄ is not obviously decreased. However, the degradation efficiency of Ag₃PO₄ was only 20.2%. This indicates that adding WO₃(H₂O)_0.333 can significantly improve the photoetching resistance of Ag₃PO₄. Finally, Z-scheme photocatalytic mechanism is investigated.     

NiS2助剂修饰g-C3N4光催化剂的简易合成及光催化制氢性能增强研究

g-C3N4是一种新型的稳定的半导体光催化材料,它可以通过热缩聚法、固相反应法、电化学沉积法和溶剂热法等制备.g-C3N4禁带宽度约为2.7 eV,吸收边在460 nm左右,具有合适的导带位置,可用作可见光响应制氢的光催化材料,但在实际应用中g-C3N4光催化性能较低,其原因可归纳为:(1)g-C3N4在吸收光子产生电子和空穴对后,光生载流子的传输速率较慢,容易在体相或表面复合,致使g-C3N4的量子效率较低;(2)材料在合成过程中易于结块,使g-C3N4的比表面积远小于理论值,严重削弱了g-C3N4光催化材料的制氢性能.目前已有很多关于g-C3N4改性的报道,但一些方法对材料的处理过程耗时较长或者合成过程较难控制.用助剂改性是提高光催化制氢活性的半导体材料的主要策略之一.合适的助剂可改进电荷分离和加速表面催化反应,从而提高光催化剂的制氢活性.虽然稀有金属或贵金属,如铂、金和银可大大提高g-C3N4的制氢速率,但由于其昂贵和稀缺性,因而应用严重受限.因此,开发成本低、储量丰富、高性能助剂来进一步提高制氢性能具有重要意义.NiS2来源丰富、价格低廉.它可在酸性和碱性的环境保持相对较高的稳定性,且其表面电子结构表现出类金属特性.但它较难与半导体光催化剂形成强耦合和界面,通常需要水热等条件下合成.实验表明,g-C3N4表面存在着大量的含氧官能团及未缩合的氨基基团,为表面接枝提供了丰富的反应活性位点,因而可利用g-C3N4表面均匀分布的含氧官能团等和Ni2+结合,再原位与S2?反应,从而在g-C3N4上负载耦合紧密的NiS2助剂,进一步提高复合材料的光催化制氢活性.本文采用低温浸渍法制备了NiS2/g-C3N4光催化剂.NiS2助剂在温和的反应条件下与g-C3N4光催化剂复合,可以防止催化剂结构的破坏,同时使得助剂均匀地分散,并紧密结合在催化剂表面,从而大大提高光催化剂的制氢性能.该样品制备过程为:(1)通过水热处理制备含氧官能团和较大比表面积的g-C3N4;(2)添加Ni(NO3)2前驱体后,Ni2+离子由于静电作用紧密吸附在g-C3N4表面;(3)在80oC加入硫代乙酰胺(TAA),可在g-C3N4的表面紧密和均匀形成助剂NiS2.表征结果证实成功制备NiS2纳米粒子修饰的g-C3N4光催化剂.当Ni含量为3 wt%,样品表现出最大的制氢速率(116μmol h?1 g?1),明显高于纯g-C3N4.此外,对NiS2/g-C3N4(3 wt%)的样品进行光催化性能的循环测试结果表明:该样品在可见光照射下可以保持一个稳定的、有效的光催化制氢性能.根据实验结果,我们提出一个可能的光催化机理:即NiS2促进了物质表面快速转移光生电子,使g-C3N4光生电荷有效分离.基于NiS2具有成本低和效率高的优点,因而有望广泛应用于制备高性能的光催化材料.