KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Peng Cheng Ruan,Hai Feng Chen,Jing Ling Hu,Jian Qiang Ye
Using Bi (NO3)3•5H2O, NH4VO3 as raw material and AgNO3, the Ag/BiVO4 were successfully prepared by a low-temperature solid-phase reaction. And Ag/BiVO4 samples were characterized by X-ray diffraction (XRD), Differential thermal analysis (DTA) and UV - visible diffuse reflectance spectroscopy (DRS). The Methyl Orange (MO) was simulated as the sewage under the visible light to study the influence of the illumination time and the amount of photocatalyst. The visible-light absorption scopes of BiVO4 were broaden by doping Ag, the UV-Visible absorption edge were slightly red shifted and the band gap was narrower comparing with the pure BiVO4. It was found that the catalytic effect of the Ag doped catalysts enhanced under the visible-light irradiation. And the cause of the enhanced catalytic effect also has been analyzed and discussed in the article.
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DOI
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Haidong Zhao,Liqin Yang,Zan Zhang,Yashuang Hei,Weitao Li,Zhen Lu,Zhiju Zhao
Creating an efficient, resilient, and low-cost material for hydrogen evolution is a tough task that has paid the attention by many researchers. Here, we present the in situ formation of non-noble metal CN@CoP heterojunction catalysts for photocatalytic hydrogen generation through a simple phosphorization technique. Consequently, the modified CN@CoP photocatalyst demonstrates an enhanced hydrogen evolution rate of 1.818 mol g −1 h −1 and superior hydrogen production stability. The results of UV–vis DRS , PL and EIS indicate that the core-shell CN@CoP heterostructure shows a faster photo-generated charge transfer. The fascinating photocatalytic performance is mainly due to the enhanced charge carrier separation efficiency and the increasing active sites, which are produced by the heterojunction.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 36
·19022-19027
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IF 11.301
Hui Ma,Haoge Cheng,Xinlei Ma,Sen Wang,Zhuqing Zhou,Yuqiao Chai,Ruoqi Chen,Xinyue Zhang,Yonglin He,Yapei Wang,Yan Li,Xusheng Wang,Rui Li,Ning Ma,Mianqi Xue
Charge/light-related advancements have greatly pushed the development of modern technology, and the relationship between charge and light is worth exploring. While research into the applications of light and charge flow (photoelectric current) is in full swing, studies on the reaction between light and electrostatic charge have made little progress on rare ways to realize photo-stimulated discharge. Herein, we link electrostatic charge and light using a bridge of intense heat, which is produced from the efficient photothermal conversion of Ti3C2Tx MXene. The in situ photothermal conversion and selective thermally stimulated discharge are successfully combined, then novel light-induced electrostatic lithography can be realized on both polymethyl methacrylate glasses and nanofilms. In this process the surface temperature of Ti3C2Tx film can be as high as 300 °C using 808 nm near-infrared irradiation at a power density of 1.7 W cm−2. The combination of light and electrostatic charge is also successfully applied to electrostatic printing and chemical reactions.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Zhao Gao,Hanpei Yang,Jingwei Li,Li Kang,Lina Wang,Junming Wu,Song Guo
Construction of semiconductor-based membranes accommodates new routes for photothermal conversion and in-situ decomposing of pollutants in solar light-driven evaporation. In this work, a novel photocatalyst composed of MoO 3- x , BiOCl, and carbon nanotubes was surficial deposited on cellulose acetate membrane. High capillary pressure (∼600 kPa) guaranteed an effective capillary rise of water from hydrophilic membrane matrix. The water was extruded into ultra-fine droplets with a saturation vapor pressure as high as ∼1.75 × 10 5 Pa and a heat flux as much as ∼2.11 × 10 −3 W mm −2 . Moreover, the top-surficial film can harvest sufficient solar photons to generate charge carries, and the surface temperature of membrane can quickly increase to higher than 50 °C by thermalization through carriers relaxation, transference, and recombination on specific sites. Simultaneously, pollutants in water are efficiently decomposed by effectively separated charge carriers on designed spots. Synergistically, a steam generation rate of ∼7.75 kg m −2 h −1 was acquired and an almost complete removal of RhB and toluene was achieved.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 56
·35663-35672
·
IF 3.361
Fang Wang,Zhenzhou Zhu,Jia Guo
ZnO and g-C3N4 provide excellent photocatalytic properties for degradation of antibiotics in pharmaceutical wastewater. In this work, 2D–2D ZnO/N doped g-C3N4 (NCN) composite photocatalysts were prepared for degradation of tetracycline (TC), ciprofloxacin (CIP) and ofloxacin (OFLX). The addition of ZnO resulted in higher separation efficiency and lower recombination rate of photogenerated charge under visible light. The composite photocatalyst showed better degradation performance compared to ZnO or NCN alone. The TC degradation reached 81.3% in 15 minutes by applying the prepared 20% ZnO/NCN composite photocatalyst, showing great competitiveness among literature reported g-C3N4 based photocatalysts. After 30 minutes, the degradation rate of TC, CIP and OFLX reached 82.4%, 64.4% and 78.2%, respectively. The TC degradation constant of the composite photocatalyst was 2.7 times and 6.4 times higher than NCN and CN, respectively. Radical trapping experiments indicated that ·O2− was the dominant active substance. The transference of excited electrons from the conduction band (CB) of NCN to ZnO enhanced the separation of photogenerated electron–hole pairs and simultaneously suppressed their recombination. This study provides a possibility for the design of high-performance photocatalysts for antibiotics degradation in wastewater.
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高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 22
·4477-4487
·
IF 5.958
Xiang-Ling Lin,Bin Chen,You-Ren Huang,Kai-Yue Song,Pan-Ke Zhou,Lu-Lu Zong,Hao-Hong Li,Zhi-Rong Chen,Rong Jiang
The design of single-component broadband photoemitters with high stability is imperative for the development of next-generation WLEDs. In this work, 1D cationic haloplumbate chains and rigid luminescent naphthalene dicarboxylate (2,6-ndc) with a larger conjugated system were used to construct crystalline single-component broadband photoemitters, i.e. formulated as [(Pb4X2)(ndc)4·A2]n (X = Cl, Br, and I, A = (CH3)3NH+ and (CH3)2NH2+). These hybrids are 3D networks built from flexible 1D cationic (Pb4X2)6+ chains and rigid 2,6-naphthalene dicarboxylic acid ligands. The variation of halogen atoms from Cl to Br/I with higher polarity can switch the holo-directed geometry to the hemi-directed geometry with different distorted degrees. The larger conjugated system of 2,6-ndc leads to strong individual blue adsorptions and emissions. In particular, the Br- and I-analogues with hemi-directed geometries can give rise to additional red emissions, corresponding to the presence of stereochemical activities of Pb centers. Consequently, Br- and I-analogues are white-light emitters containing red emissions stemming from deformable haloplumbate and blue emissions originating from luminescent naphthalene motifs. Interestingly, haloplumbate-based emissions are thermally tunable, and those of naphthalene are generally inactive to thermal stimulus. As a result, tunable emissions from blue/white to yellow can be achieved. The higher quantum yield of Br-analogues can be assigned to their worse haloplumbate connectivity, which can enhance the electron–phonon coupling. In all, the combination of flexible haloplumbate chains with larger π-conjugated fluorophores is an efficient strategy for the construction of tunable broadband photoemitters.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 9
·e4448
·
IF 3.581
Shiyu Zuo,Haiming Xu,Wei Liao,Lei Sun,Donghui Han,Jie Zan,Binyang Zhang,Dongya Li,Dongsheng Xia
Acid-treated g-C 3 N 4 -Cu 2 O was prepared by hydrothermal reduction followed by high temperature calcination and acid exfoliation. The structures and properties of as-synthesized samples were characterized using a range of techniques, such as X-ray photoelectron spectroscopy, scanning electron microscopy, Photoluminescence Spectroscopy and the Brunauer–Emmett–Teller (BET) theory. The photocatalytic activity was evaluated by measuring the photodegradation of methyl orange under visible-light irradiation. Based on the results of TEM, XPS, EPR and other techniques, it was verified that a heterojunction was formed. The acid treatment process can increase the specific surface area to form abundant heterojunction interfaces as channels for photo-generated carrier separation, thereby enhancing its light utilization and quantum efficiency. Results indicate that acid-treated g-C 3 N 4 -Cu 2 O possesses a large specific surface area, which provides plentiful activated sites for heterojunctions to form; in addition, it showed a high visible light effect and the minimum charge-transfer resistance. Furthermore, the g-C 3 N 4 -Cu 2 O material exhibits high levels of effectiveness and stability. Electron paramagnetic resonance and a series of radical trapping experiments demonstrate that the holes and •O 2 − could be the main active species in methyl orange photodegradation. This work could provide new insights into the fabrication of composite materials as high-performance photocatalysts, and facilitate their application in addressing environmental protection issues.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Hui Wang,Chenyu Zhang,Lingru Kong,Yi Wang,Sijia Zhang,Xiulian Zhang,Jie Ding,Nanqi Ren
A novel porous core-shell magnetic β-cyclodextrin/graphitic carbon nitride photocatalyst (Mβ-CD/GCN) was synthesized and employed in a solar light driven catalytic system for the degradation of polychlorinated biphenyls (PCBs). The Mβ-CD/GCN display superior photocatalytic performance on account of porous structure and ultrathin GCN nanosheets design, the former improves the utilization of visible light by multiple scattering and reflection of incident light, and the latter accelerates electron transfer . The ultrahigh specific surface area (1255 m 2 g −1 ) of Mβ-CD/GCN provided a large number of active sites for adsorption and degradation of the target pollution. The pseudo-first order reaction rate constant ( k obs ) for the degradation of PCB180 by Mβ-CD/GCN was 0.021 min −1 , which improved 3.23 times than the bulk GCN. Additionally, the effects of various reaction parameters and water matrices were studied on the degradation of PCB180. Three possible degradation pathways and mechanism of PCB180 were speculated according to the identification of reaction intermediates and detection of reactive species. The solar light driven Mβ-CD/GCN catalytic technology is a promising method not only for the control of persistent organic pollutants (POPs), but also the catalyst could be recovered and reused through simple magnetic separation.
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PubMed
高影响因子
Asian Journal of Organic Chemistry
·
2022
·Vol. 11
·期 8
·e202200318
·
IF 3.116
Xingxing Cai,Jiahui Fu,Li Gu,Dongping Cheng,Hong Wang,Xiaoliang Xu
Graphical A visible light-promoted cascade reaction of acryloylbenzamides with carboxylic acids and α-imino oxy acid is established. A series of 4-substituted isoquinolindiones are obtained in satisfied yields. A metal-free and mild cascade reaction of acryloylbenzamides with carboxylic acids and α-imino oxy acid is developed. It undergoes decarboxylation, radical addition, and intramolecular cyclization in the presence of visible light, providing 4-substituted-isoquinoline-1,3(2H,4H)-diones in moderate to good yields.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 10
·5433-5440
·
IF 2.936
Chol-Nam Ri,Song-Gol Kim,Kyong-Sik Ju,Hyok-Su Ryo,Chol-Ho Mun,U-Hyon Kim
A novel Bi2MoO6/Bi4V2O11 heterostructured photocatalyst was successfully fabricated using a facile one-pot solvothermal method. This heterojunction consists of homogeneous dispersed Bi4V2O11 nanocrystals anchored on the surface of Bi2MoO6 nanoflakes, endowing the heterojunction with nanosized interfacial contact. Based on the favorable interfacial contact, the band alignment at the heterojunction effectively facilitated photo-generated carrier transfer, which was verified by photoelectrochemical and photoluminescence measurements. Thereby, in contrast with pristine Bi2MoO6 and Bi4V2O11, the as-synthesized heterojunction with nanoscale contact exhibited significantly enhanced photocatalytic activity towards the degradation of MB and the reduction of Cr(VI). In addition, the as-fabricated Bi2MoO6/Bi4V2O11 heterojunction exhibited good cycling stability for MB degradation after 4 cycles. Finally, a plausible photocatalytic mechanism for MB degradation over the Bi2MoO6/Bi4V2O11 heterojunction was discussed in detail. This work not only reports a highly efficient photocatalyst but also sheds light on the design and optimization of a heterojunction.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Peng Kong,Hao Tan,Tingyu Lei,Jie Wang,Wenjun Yan,Ruiyi Wang,Eric R. Waclawik,Zhanfeng Zheng,Zhong Li
Conjugated polyimide (R-PI) containing triazine ring was synthesized by a modified thermal solid-state polymerization of the salt monomer. The structure of the as-prepared R-PI was characterized by FTIR, XPS, EPR, EA and solid-state 13 C NMR, which is rich in oxygen vacancies (OVs). The R-PI exhibits excellent catalytic performance for selective benzylamine oxidation reactions under visible light. Both experimental and theoretical calculation results indicated that the introduction of OVs could increase the level of electron delocalization of R-PI. R-PI possess more excitable electrons and a narrower band gap, which expands the absorption of long-wavelength light. The surface OVs also serve as excellent sites for molecular O 2 adsorption and activation. Chemisorbed O 2 spatially builds up a channel for the delivery of photoexcited electrons to O 2 , which effectively enhanced separation efficiency of photogenerated charge carriers. These results indicate that OVs-rich conjugated polyimides can be efficient visible light-responsive photocatalysts for green synthesis.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Dongya Li,Shiyu Zuo,Haiming Xu,Jie Zan,Lei Sun,Donghui Han,Wei Liao,Binyang Zhang,Dongsheng Xia
A g-C 3 N 4 -Cu 2 O was successfully synthesized in the presence of PEG-400 surfactant via a hydrothermal method and high-temperature calcination method. Based on the results of TEM , XPS , EPR , and other techniques, it was verified that a heterojunction was formed. The synthesized g-C 3 N 4 -Cu 2 O show excellent photocatalytic activity and stability was confirmed through cycling experiments, XRD and XPS. At a suitable addition amount, the value of band gap of g-C 3 N 4 -Cu 2 O is reduced to 1.87 eV, the PL intensity decreases effectively, the specific surface area is increased to 12.8114 m 2 /g, and the photocatalytic degradation rate is increased to 94%. Adding the surfactant PEG-400 in the precursor solutions leads to a reduction in the crystallite size, which can improve the morphology and specific surface area to form abundant heterojunction interfaces as channels for photo-generated carrier separation, and improve its light utilization and quantum efficiency.
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高影响因子
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