CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chao Liu,ShanShan Dong,Yinguang Chen
Effective interface contact between components in heterojunction is crucial to realize high photocatalytic performance of photocatalyst. In this paper, the improvement of heterojunction contact by forming new ternary heterostructure via calcining the mixture of tetracycline and melamine to obtain the graphene-like carbon plane grafted g-C 3 N 4 and then coupling it with TiO 2 is reported. The unique carbon plane, which is anchored into g-C 3 N 4 basal domains, acts as a significant role to achieve the sufficient ternary heterojunction contact in the novel carbon plane/g-C 3 N 4 /TiO 2 nanostructure system. Under visible-light irradiation, the new ternary nanocomposite exhibits excellent photocatalytic activity for efficient removal of aqueous organic contaminants: methylene blue (98.6%), tetracycline (94.0%), and norfloxacin (95.3%), with the corresponding degradation rate constants of 0.0441, 0.0302, and 0.0125 min −1 , respectively, which are 54.1, 9.8, and 9.4 times higher than that of the pure g-C 3 N 4 . The mechanism study indicates that the excellent photocatalytic activity is attributed to the effective heterojunction, which can successfully extend visible-light absorption, promote charge separation efficiency, and suppress recombination of the photocatalytic electron-hole pairs. Moreover, the electron spin resonance (ESR) assay and radical scavenger experiments demonstrate that the photogenerated holes (h + ), superoxide anion radicals ( O 2 − ), and hydroxyl radical ( OH) play vital roles in photocatalytic degradation process. Importantly, this work may open up novel insights into the design of ternary heterostructure with highly efficacious photocatalytic performance, which suggests attractive applications in environment protection.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 2
·215
·
IF 4.034
Shengqiang Zhang,Changsheng Su,Hang Ren,Mengli Li,Longfeng Zhu,Shuang Ge,Min Wang,Zulei Zhang,Lei Li,Xuebo Cao
The nanocomposite preparation procedure plays an important role in achieving a well-established heterostructured junction, and hence, an optimized photocatalytic activity. In this study, a series of g-C3N4/ZnO nanocomposites were prepared through two distinct procedures of a low-cost, environmentally-friendly, in-situ fabrication process, with urea and zinc acetate being the only precursor materials. The physicochemical properties of synthesized g-C3N4/ZnO composites were mainly characterized by XRD, UV–VIS diffuse reflectance spectroscopy (DRS), N2adsorption-desorption, FTIR, TEM, and SEM. These nanocomposites’ photocatalytic properties were evaluated in methylene blue (MB) dye photodecomposition under UV and sunlight irradiation. Interestingly, compared with ZnO nanorods, g-C3N4/ZnO nanocomposites (x:1, obtained from urea and ZnO nanorods) exhibited weak photocatalytic activity likely due to a “shading effect”, while nanocomposites (x:1 CN, made from g-C3N4and zinc acetate) showed enhanced photocatalytic activity that can be ascribed to the effective establishment of heterojunctions. A kinetics study showed that a maximum reaction rate constant of 0.1862 min-1can be achieved under solar light illumination, which is two times higher than that of bare ZnO nanorods. The photocatalytic mechanism was revealed by determining reactive species through adding a series of scavengers. It suggested that reactive ●O2−and h+radicals played a major role in promoting dye photodegradation.Keywords:ZnO nanorods;dye photodegradation;graphitic carbon nitride;nanocomposites;in situ synthesis
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 8
·4635-4643
·
IF 3.049
Xiufang He,Zhansheng Wu,Yongtao Xue,Zhenzhen Gao,Xia Yang
Graphitic carbon nitride (g-C3N4) has been considered to be a promising metal-free photocatalyst, although the high recombination rate of charge carriers and poor absorption of visible light have limited its applications. In order to overcome these problems, an interlayer composite photocatalyst that comprised β-cyclodextrin (β-CD), oxygen-doped C3N4 (O-C3N4) and molybdenum disulfide (MoS2) was successfully constructed for the highly enhanced photodegradation of glyphosate in this study. The structure and morphology, optical properties, and photoelectrochemical properties of the prepared photocatalyst were characterized via a series of characterization techniques. The average fluorescence lifetime of the composite photocatalyst was extended from 6.67 ns to 7.30 ns in comparison with that of g-C3N4, which indicated that the composite photocatalyst enhanced the absorption of visible light and also inhibited the recombination of electron–hole pairs. The mass ratio of MoS2 that corresponded to O-C3N4/MoS2-5 enabled the highest removal rate under simulated sunlight irradiation, which was almost twice that achieved using pure g-C3N4. Relative species scavenging experiments revealed that ·O2− was the main species during the process of photodegradation. Besides, a toxicity test indicated that glyphosate became less toxic or non-toxic after photodegradation. This study provided an effective, feasible and stable photocatalyst driven by simulated sunlight irradiation for the highly enhanced photodegradation of glyphosate.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Nan Wang,Bin Han,Jianbo Wen,Mingwei Liu,Xinjun Li
A novel Mn-doped Fe 2 O 3 modified g-C 3 N 4 nanosheets composite has been prepared for overall water splitting. Structure characterizations reveal that the Mn are successfully doped in the Fe 2 O 3 nanoparticle and a close interface between g-C 3 N 4 and Mn-doped Fe 2 O 3 is obtained. The optimized FMC-10 photocatalyst has a H 2 evolution of 51 μmol h −1 . The improved photocatalytic performance can be ascribed to the synergy effect of both Mn-doped Fe 2 O 3 and g-C 3 N 4 . Doping Fe 2 O 3 with Mn promotes photo-induced charges and increases the charge transfer for the improved conductivity of the bulk Fe 2 O 3 , while favorable contacting with g-C 3 N 4 enhances the charge separation ability.
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2019
·
IF 5.667
Yanqian Wu,Yi Xiao,Yushu Huang,Yanyun Xu,Donglei You,Wei Lu,Jiahui Yu
A biodegradable brush-type copolymer PHF-g-(PCL-PEG) based on a cleavable polyacetal backbone and biodegradable side chain modified with polyethylene glycol (PEG) was synthesized in this paper. This particular structure was directional to facilitate the formation of spherical or rod-shaped micelles. Flow cytometry showed that rod-shaped micelles displayed enhanced cellular uptake compared to spherical micelles. Rod-shaped micelles were selected to investigate their drug delivery abilities in detail. In vitro experiments verified the pH-triggered drug release of DOX-loaded micelles, and the release rate of doxorubicin (DOX) was 77% at pH 5.0 and 26% at pH 7.4. In drug-release kinetic analysis, a double-exponential model achieved the best fit. The copolymer appeared to be almost nontoxic, while the DOX-loaded micelles showed equivalent cytotoxicity compared to DOX at high concentration. The endocytosis of DOX-loaded micelles was two times that of DOX. Our findings suggest that the pH-sensitive brush type copolymer could be a possible carrier in drug delivery.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 46
·12660-12667
·
IF 5.976
Lan Mu,Liyi Shi,Yanqin Wang,Qianfan Zhou,Jinhong Ye,Xin Feng
Functional nanopaper based on cellulose nanofibrils (CNF) has attracted growing interest due to its renewability, biodegradability and enhanced printability. In this study, we developed novel transparent and luminescent nanopaper with excellent mechanical flexibility by grafting graphitic carbon nitride (g-C3N4) nanosheets with TEMPO-mediated oxidation CNF (TCNF) using a pressured extrusion paper-making technique. The carboxyl groups on the TCNF surface acting as active sites are covalently cross-linked with –NH2 or –NH groups of g-C3N4 nanosheets via EDC/NHS coupling chemistry, and then the g-C3N4@TCNF nanopaper with heterogeneous network structures is finally assembled. The hybrid nanopaper combines the advantages of TCNF and g-C3N4, exhibiting outstanding transparency and luminescent properties. Moreover, the transparent luminescent nanopaper possesses excellent thermal stability and mechanical flexibility. The intelligent design of high-performance nanopaper based on TCNF grafted with g-C3N4 nanosheets provides a potential strategy for applications in the easily identifiable and difficult-to-copy anti-counterfeiting fields.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Qian Zhang,Xin Gao,Yifei Wang,Hui Li,Yanlin Zhang,Yanping Fan,Jing Niu
Photocatalytic technologies capable of using solar energy for environmental restoration have much progressed with the increasing environmental concern. In this study, the ternary photocatalyst Ag 3 PO 4 /NG/g-C 3 N 4 conforming to the Z-scheme mechanism was prepared by a facile in-situ deposition method . Its morphology, chemical composition and optical property were determined by X-ray diffraction analysis, scanning electron microscopy, transmission electron microscope, Fourier transform infrared, X-ray photoelectron spectroscopy and UV–vis diffuse reflectance spectroscopy. Such photocatalyst (0.50 g/L loading) achieved the highest 93.6% degradation rate of tetracycline (TC), and 72% mineralization rate of TC comparing with single Ag 3 PO 4 (25% mineralization rate of TC). The detection of reactive oxidative species indicates that the photodegradation of TC is mainly caused by holes, O 2 − and OH. The synergistic effect of Ag 3 PO 4 , nitrogen-doped graphene (NG) and g-C 3 N 4 in the composite accelerates the separation and migration of photogenerated carrier via a solid electron mediator NG , and simultaneously inhibits the photo-corrosion of Ag 3 PO 4 , thereby improving the photo-stability of the ternary photocatalyst.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xiang Lv,Tianhe Wang,Wei Jiang
We report a novel method to prepare translucent and stable Ag@AgCl/g-C 3 N 4 /TiO 2 ceramic films having strong photocatalytic activities and self-cleaning capabilities under light irradiation. Colloidal silica was used as an inorganic binder and P25 TiO 2 was added as a hydrophilicity enhancer without which a smooth coating was not achievable. Ag@AgCl of particle size around 30 nm, was synthesized by in-situ oxidation of nano-silver particles in porous g-C 3 N 4 /TiO 2 films. Optimal conditions for Ag@AgCl/g-C 3 N 4 /TiO 2 preparation in terms of strongest photocatalysis were established by tests on Rhodamine B degradation under visible and full spectral irradiations. A good adhesion strength of the porous films on glass substrate was achieved. Stability and reusability of the films were assessed by cycling tests. Possible photocatalytic mechanisms are proposed based on the basis of trapping experiments. Systematic characterization of the film suggests that the in-situ oxidation is an effective and practical method to produce nanoscale Ag@AgCl.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Liquan Jing,Yuanguo Xu,Zhigang Chen,Minqiang He,Meng Xie,Jie Liu,Hui Xu,Shuquan Huang,Huaming Li
Highly efficient different morphologies of SnS2 (nanoparticles, nanosheets, and 3D flower-like)/g-C3N4 composites were, respectively, prepared via an elementary hydrothermal method that was integrated with the calcination means. The XRD results showed that the relative intensities of several diffraction peaks, especially (001), (100), (101), and (102), indicated that the as-prepared samples (SnS2 nanoparticle, SnS2 nanosheet, and 3D flower-like SnS2) should be dominated by different specific preferred growth of facets. In comparison with SnS2 and pure g-C3N4, the SnS2/g-C3N4 composites exhibited much higher H2 development performance under visible light irradiation in the presence of Na2SO3 and Na2S as the sacrificial agent. The SnS2 nanoparticles/g-C3N4 composites exhibit the highest visible-light-driven H2-generation rate of 6305.18 μmol h–1 g–1 without any noble metal as cocatalyst, which is approximately 16.98 times higher than that of SnS2 nanoparticles. In all, the SnS2 nanoparticles (SnS2 nanoparticle/g-C3N4 composite) dominated by (001) and (100) preferred growth of facets exhibit significant photocatalytic activity resulting from their suitable band edges to realize the photocatalytic redox reaction. The analysis of photocurrent response, linear sweep voltammograms, and photoluminescence demonstrated that the low recombination rate and the efficacious charge transfer of photogenerated carriers could be assigned to the interactive impact of g-C3N4 and SnS2.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 40
·22577-22582
·
IF 2.936
Fengying Dai,Mengjuan Wen,Jinna Wang,Wenzhe Jiang,Xuetao Tian,Yao Dong,Yiping Zhao,Li Chen
To detect and adsorb methylene blue (MB) from wastewater simultaneously, a solid fluorescent and absorbent material was designed by immobilizing attapulgite (ATP) on calcium alginate (CA) and reacting with carbon dots (CDs) which were modified by the activation of γ-(2,3-epoxypropoxy) propyltrimethoxysilane (KH-560), then the CA/ATP-g-CDs gel fibers were prepared. The problem of CDs easily falling out of materials was solved. The structures of the gel fibers were characterized by field emission scanning electron microscopy (FE-SEM), specific surface area (BET) and X-ray photoelectron spectroscopy (XPS). The thermal properties were analyzed by thermogravimetry (TG). The adsorption capacity was measured and the effect of initial pH was investigated. The results showed that ATP was successfully reacted with CA and the adsorption capacity was enhanced with the increase of the pH value. CA/ATP-g-CDs gel fibers were favorable materials to detect and adsorb MB simultaneously, and MB could be adsorbed by gel fibers and also the fluorescence of CA/ATP-g-CDs was weakened. At low concentrations of MB (1 μg L−1), the removal efficiency could even be as high as 100%.
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Gaoyuan Long,Jiafeng Ding,Lihong Xie,Runze Sun,Mengxia Chen,Yanfang Zhou,Xiuying Huang,Gaorui Han,Yajun Li,Weirong Zhao
Chlorophenols (CPs) have been considered as a kind of priority environmental pollutants for their potential detrimental effects, and photocatalytic reduction dechlorination tend to be a promising approach to CPs’ removal. In this work, 2,4-dichlorophenol (2,4-DCP) was adopted as the model pollutant of CPs, and a simple mixing and heating method was employed to prepare graphitic carbon nitride and bismuth tungstate (g-C 3 N 4 /Bi 2 WO 6 ) binary photocatalysts. Under UV–vis light irradiation and anoxic atmosphere, the g-C 3 N 4 /Bi 2 WO 6 samples exhibited enhanced photocatalytic activities. The optimal dechlorination rate constant of 2,4-DCP over g-C 3 N 4 /Bi 2 WO 6 (weight ratio 3:7) was 1.13 h −1 , 7.6 and 8.9 times higher than that of pristine g-C 3 N 4 and Bi 2 WO 6 respectively. The enhanced activities originated from the effective suppression of charge recombination and extended spectrum absorption range. Kinetic studies revealed that the dechlorination processes followed the pseudo-first-order model. The photocatalytic mechanism of 2,4-DCP over g-C 3 N 4 /Bi 2 WO 6 was discussed in detail, and based on which, a mediator-free Z-scheme mechanism was proposed. This work extends the application range of g-C 3 N 4 /Bi 2 WO 6 photocatalyst and provides a new insight into environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 15
·14486-14498
·
IF 2.8
Song Chengjie,Fan Mingshan,Shi Weidong,Wang Wei
We have successfully synthesized the composites of two-phase g-C 3 N 4 heterojunction photocatalysts by one-step method. And the reduced graphene oxide/two-phase g-C 3 N 4 heterojunction photocatalyst was fabricated via a facile hydrothermal reduction method. The characterization results indicated that the two-phase g-C 3 N 4 was integrated closely, and the common phenomenon of agglomeration for g-C 3 N 4 was significantly reduced. Moreover, the oxidized graphene was reduced successfully in the composites and the graphene was overlaid on the surface or the interlayers of g-C 3 N 4 heterojunction composite uniformly. In addition, we have carried out the photocatalytic activity experiments by H 2 evolution and rhodamine B removal, tetracycline removal under the visible light irradiation. The results revealed that the composite has improved the separation efficiency a lot than the pure photocatalyst. The photocurrent test demonstrated that the recombination of electrons and holes were efficiently inhibited as well as enhanced the photocatalytic activity. The 0.4% rGO loaded samples, 0.4% rGOCN2, own the best performance. Its rate of H 2 evolution was 15 times as high as that of the pure g-C 3 N 4 .
✓ 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）