PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 43
·29354-29362
·
IF 4.493
Xia Cui,Yi Fan Zheng,Hao Yong Yin,Xu Chun Song
In this study, C3N4/Zn1−xCdxS (0 ≤ x ≤ 1) heterostructures with adjustment of the band gap were successfully prepared by calcination and a hydrothermal synthesis method. The photocatalytic properties of C3N4/Zn1−xCdxS composite photocatalysts were evaluated by the photocatalytic degradation of RhB under visible light irradiation. The results showed that the combination of the two semiconductor photocatalysts (C3N4 and Zn1−xCdxS) greatly enhanced the photocatalytic degradation efficiency of RhB compared to the pure C3N4 and Zn1−xCdxS under visible light irradiation. Among them, the 0.1C3N4/Zn0.8Cd0.2S composite photocatalyst exhibited the highest photocatalytic activities with the degradation efficiency of RhB arriving to 97.9% within 90 min. The remarkable photocatalytic activity of the 0.1C3N4/Zn0.8Cd0.2S composite photocatalyst was mainly attributed to the appropriate band structure and the effective separation of photogenerated electron–hole pairs. Additionally, a possible basic mechanism of the composite semiconductor photocatalytic process was also discussed. Moreover, it was also investigated that O2˙− and h+ were the main reactive oxidative species in this photocatalytic process of the degradation of RhB on the 0.1C3N4/Zn0.8Cd0.2S heterostructure photocatalyst.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Zhi Zhu,Ziyang Lu,Dandan Wang,Xu Tang,Yongsheng Yan,Weidong Shi,Youshan Wang,Nailing Gao,Xin Yao,Hongjun Dong
A high-dispersed Ag/Fe 3 O 4 /g-C 3 N 4 composite photocatalyst is firstly synthesized by means of the selective photo-deposition technique. It exhibits the obvious improvement of photocatalytic activity and stability for degrading tetracycline besides retaining the recycled magnetic property. The enhanced photocatalytic activity originates from synergetic effect of Ag, Fe 3 O 4 and g-C 3 N 4 that improves light absorption capacity and separation efficiency of charge carriers. This work provides a promising approach to develop visible-light-response and recycled photocatalysts applied to antibiotic wastewater treatment .
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Shuisheng Hu,Wenjun Ouyang,Longhua Guo,Zhenyu Lin,Xiaohua Jiang,Bin Qiu,Guonan Chen
A fluorescent biosensor for ochratoxin A was fabricated on the basis of a new nanocomposite (Fe 3 O 4 /g-C 3 N 4 /HKUST-1 composites). Fe 3 O 4 /g-C 3 N 4 /HKUST-1 was synthesized in this work for the first time, which combined HKUST-1 with g-C 3 N 4 to improve its chemical stability. Fe 3 O 4 /g-C 3 N 4 /HKUST-1 composites have strong adsorption capacity for dye-labeled aptamer and are able to completely quench the fluorescence of the dye through the photoinduced electron transfer (PET) mechanism. In the presence of ochratoxin A (OTA), it can bind with the aptamer with high affinity, causing the releasing of the dye-labeled aptamer from the Fe 3 O 4 /g-C 3 N 4 /HKUST-1 and therefore results in the recovery of fluorescence. The fluorescence intensity of the biosensor has a linear relationship with the OTA concentration in the range of 5.0–160.0 ng/mL. The LOD of sensor is 2.57 ng/mL (S/N=3). This fluorescence sensor based on the Fe 3 O 4 /g-C 3 N 4 /HKUST-1 composites has been applied to detect OTA in corn with satisfying results.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SUPERLATTICES AND MICROSTRUCTURES
·
2016
·
IF 2.117
Fangmin Yan,Lianfeng Duan,Qiqian Gao,Jiao Men,Shihan Sun,Xueyu Zhang,Wei Lü
In spite of the great development in quantum dot sensitized solar cells (QDSSCs), enrichment of material system of QDSSCs is still imperial mission for further advances. In this report, two-dimensional graphitic carbon nitride (g-C 3 N 4 ) prepared from urea was applied to modify porous TiO 2 photoanodes , followed by the deposition of CdS and CdSe QDs as sensitizers. In the as-prepared photoanodes, g-C 3 N 4 functioned as barrier for retarding electron backward recombination and assisted to strengthen light absorption . Compared with the pure TiO 2 photoanode, the photoelectrical behaviors of g-C 3 N 4 modified TiO 2 photoanode were obviously improved. By optimizing the loading amount of g-C 3 N 4 , the champion performance was achieved at 15% addition amount of g-C 3 N 4 with shortcircuit current density of 15.1 mA cm −2 , open circuit voltage of 0.56 V, and energy conversion efficiency of 4.14% under AM 1.5 illumination. The improvement in cell performance was attributed to the type II alignment between g-C 3 N 4 and TiO 2 , which induced the fast separation of photogenerated carriers. The transfer of the photogenerated electrons and holes is driven by the conduction band offset of 0.39 eV and the valence band offset of 0.86 eV, respectively. Present results provided a new insight for further optimum photoanode structures of QDSSCs.
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2016
·
IF 6.198
Kui Li,Xin Xie,Wei-De Zhang
Graphitic carbon nitride-based nanocomposites hold great promise in photocatalysis . In this study, nanocomposites based on graphitic carbon nitride-encapsulating carbon spheres (CS/g-C 3 N 4 ) were facilely fabricated through polymerization of melamine from the carbon spheres. The incorporation of carbon spheres in g-C 3 N 4 leads to enlarged contact area and strengthened interaction between the two π-conjugated components. The CS/g-C 3 N 4 composites exhibit large specific surface area, improved visible light utilization, more negative potential of conduction band , and enhanced separation of photo-generated charge carriers. The optimized CS/g-C 3 N 4 composite displays a hydrogen evolution rate of 50.2 μmol h −1 , which is almost 4.8 times of that over the pure g-C 3 N 4 . The structures and morphologies of the catalysts can be maintained after photocatalytic reaction. This approach may stimulate a new way to construct g-C 3 N 4 -based nanocomposites with other carbon materials.
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2017
·
IF 0
Hong Liu,Zhe Zhang,Jingchai Meng,Jiang Zhang
Photocatalytic conversion of CO 2 into hydrocarbon fuels using semiconductor photocatalysts has attracted great attention, which is considered as a promising approach to resolve the energy shortage and greenhouse effect. In this work, ordered mesoporous g-C 3 N 4 (mpg-C 3 N 4 ) nanosheets supported CdIn 2 S 4 nanocomposites were successfully fabricated by a hard-template combinated with hydrothermal method. The hybrids showed highly efficient photocatalytic activities for the reduction of CO 2 to CH 3 OH under visible-light irradiation. The optimized CdIn 2 S 4 /mpg-C 3 N 4 photocatalyst exhibited a high CH 3 OH-production rate of 42.7 μmol g −1 h −1 at a mpg-C 3 N 4 content of 20 wt%. This rate was 1.8 times higher than that of pure CdIn 2 S 4 . The significant enhancement of photocatalystic activity was mainly ascribed to the increased CO 2 adsorption capacity and the improved separation and transfer of photogenerated electron-hole pairs at the intimate interface of CdIn 2 S 4 /mpg-C 3 N 4 heterojunctions. Furthermore, the hybrid photocatalysts displayed excellent stability under visible-light. A possible mechanism of enhanced photocatalytic activity of CdIn 2 S 4 /mpg-C 3 N 4 composite on photocatalytic reduction of CO 2 was also proposed. This work may provide some useful information for the future design and practical application of multifunctional hybrid photocatalysts in photocatalytic reduction of CO 2 .
✓ 已验证
产品关联
DOI
CHINESE JOURNAL OF CATALYSIS
·
2017
·
IF 2.813
Xu Tang,Liang Ni,Juan Han,Yun Wang
abstract A stable PNIPAM/Fe 3 O 4 /g-C 3 N 4 composite photocatalyst was designed and prepared by a thermal photoinitiation technology. The structure and properties of the materials were characterized and the composite photocatalyst was found to show good stability for tetracycline degradation. The sample not only retained the magnetic properties of Fe 3 O 4 , allowing it to be recycled, but its photocatalytic properties could also be changed by controlling the temperature of the reaction system. The degradation intermediate products of tetracycline were further investigated by MS . This work provides a new facile strategy for the development of intelligent and recyclable photocatalytic materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2016
·
IF 4.179
Yinhua Jiang,Fan Li,Yan Liu,Yuanzhi Hong,Peipei Liu,Liang Ni
An interlayer structure hybrid photocatalyst of TiO 2 hollow sphere/g-C 3 N 4 (TOCN) has been successfully constructed via a facile impregnation process. The photocatalytic activity was evaluated by degrading Rhodamine B under visible irradiation. TOCN-2 with 33 wt.% g-C 3 N 4 had much higher photocatalytic efficiency (98.09%) than pure g-C 3 N 4 (18.62%) and TiO 2 hollow sphere (16.37%). Significantly, TOCN-2 showed much superior photocatalytic performance than TiO 2 nanoparticle/g-C 3 N 4 composite (53.16%), indicating the hollow morphology of TiO 2 also played a crucial role for RhB degradation. In TOCN system, both the morphology effect of TiO 2 and the synergistic effects between TiO 2 and g-C 3 N 4 resulted in significantly enhancing photocatalytic performance.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Yuanzhi Hong,Yadong Meng,Guangyi Zhang,Bingxin Yin,Yong Zhao,Weidong Shi,Changsheng Li
Novel carbon quantum dots (CQDs)/graphitic-like carbon nitride (g-C 3 N 4 ) metal-free heterojunctions were firstly synthesized via a facile low temperature process. Multiple physicochemical techniques were carried out to characterize the samples. The CQDs with the average size of about 5 nm are attached to the surfaces of g-C 3 N 4 nanosheets. The photocatalytic activity of as-prepared samples was carefully evaluated by the degradation of rhodamine B (RhB) and tetracycline hydrochloride (TC-HCl) under visible light irradiation. Photocatalysis result displayed that the CQDs/g-C 3 N 4 heterojunctions can significantly enhance visible-light photocatalytic activity in compared to that of pristine g-C 3 N 4 . The reaction rate constant of the optimum active C0.50%/CN heterojunction for the photodegradation of RhB and TC-HCl were about 3.7-fold and 1.9-fold higher than that of bare g-C 3 N 4 , respectively. The efficiently enhanced photoactivity was attributed to the CQDs not only can improve the photogenerated electron–hole pair’s separation, but also can increase light harvesting by the up-conversion photoluminescence behavior. Moreover, the as-prepared C0.50%/CN sample also exhibited excellent photostability and recyclability for both photodegradation of RhB and TC-HCl. In addition, the possible enhanced photocatalytic mechanism was proposed and analyzed by the active species trapping experiments. This work will bring about potential for application in environmental purification and useful for designing other CQDs-based photocatalyst in energy conversion.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Shao-jia Liu,Fa-tang Li,Yi-lei Li,Ying-juan Hao,Xiao-jing Wang,Bo Li,Rui-hong Liu
The mismatches of lattices and energy bands in heterojunction are the dominant factors restricting the generation efficiency of reactive oxygen species (ROS) that are powerful tools for water purification and anti-bacteria. In this paper, the mediated lattice matching role of amorphous Al 2 O 3 is presented for constructing the ternary g-C 3 N 4 /Al 2 O 3 /ZnO heterojunctions, which exhibit higher molecular oxygen activation performance than binary g-C 3 N 4 /ZnO and g-C 3 N 4 /Al 2 O 3 heterojunctions. The oxygen activation ability and the ROS generation were testified by the electron paramagnetic resonance (EPR) measurement, transformation of nitroblue tetrazolium (NBT) and degradation of methylene blue (MB). The ROS include superoxide anion radical ( O 2 − ) and consequent product of hydroxyl radical ( OH). The superior oxygen activation performance of the ternary heterojunctions can be attributed to the lattices matching of the mediated amorphous Al 2 O 3 and the resultant efficient cascade electron transfer.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Ruirui Hao,Guohong Wang,Hua Tang,Lingling Sun,Chang Xu,Deyan Han
Mesoporous photocatalytic materials with macroporous structures have attracted more and more attention because of their textural mesopores and intrinsic interconnected pore networks, which are able to efficiently transport guest species to framework binding sites. In this work, macro/mesoporous g-C 3 N 4 /TiO 2 heterojunction photocatalysts were fabricated without templates or additives by a facile calcination method using tetrabutyl titanate and melamine as the feedstocks. Photocatalytic experiments of the as-prepared samples were measured by the photocatalytic oxidation degradation of RhB solution at room temperature under visible light irradiation. The results indicated that the melamine content in the precursors had an important influence on photocatalytic activity of the as-prepared samples. At the optimal loading content, the apparent reaction rate constant ( k ) was 47.8 × 10 −3 min −1 for RhB degradation, exceeding that of pure TiO 2 (6.6 × 10 −3 min −1 ) and g-C 3 N 4 (15.2 × 10 −3 min −1 ) by factor of 7.2 and 3.1 respectively. The improved photocatalytic activity was attributed to high surface area and heterostructure formation of g-C 3 N 4 /TiO 2 composites. The trapping experiment results showed that O 2 − and h + were main active species in the decomposition of RhB. A possible enhanced photocatalytic mechanism of g-C 3 N 4 /TiO 2 heterojunction photocatalysts was proposed.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2016
·Vol. 26
·期 2
·739-744
·
IF 1.601
Cao Yujuan,Wu Wei,Wang Song,Peng Hong,Hu Xiaogang,Yu Ying
Rapid and sensitive detection of heavy-metal ions in natural water environments worldwide is urgently needed because of their severe threats to human health. In the present work, monolayer graphite-like flake C 3 N 4 (g-C 3 N 4 ) materials were applied as a new fluorescent sensor for the detection of trace silver ion in aqueous solution. The thickness of synthesized g-C 3 N 4 was 0.45 nm and obtained by exfoliating twice with ultrasonic. With the presence of ethylene diamine tetraacetic acid as a screening agent, the highly sensitive sensor reached a low detection limit of 52.3 nmol/L for silver (I) ion and there was no disturbance when silver (I) ion coexisted with other metal ions in water samples. Under the optimal conditions, the monolayer g-C 3 N 4 was successfully used to detect trace silver (I) ion in different environmental water and drinking water samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）