Colloid and Interface Science Communications
·
2022
·
IF 5.633
Zhiying Guo,Fangxu Dai,Huixiang Yin,Mingming Zhang,Jun Xing,Lei Wang
Gold nanoparticles (Au NPs) are widely utilized to broaden the light absorption of the photocatalysts due to their localized surface plasmon resonance (LSPR). However, the photocatalytic mechanism of Au/photocatalyst heterostructure involving charges transfer and reactive sites is still in dispute. Here, we synthesized a typical system Au/graphite carbon nitride (g-C 3 N 4 ) and demonstrate that the role of Au NPs in the LSPR enhanced photocatalysis . Under visible light, the photoexcited electrons of g-C 3 N 4 would transfer to Au NPs and reduce protons into hydrogen together with hot electrons of Au NPs. The hot holes of Au NPs would flow to g-C 3 N 4 and oxidize triethanolamine . Therefore, the Au NPs play a dual role, plasma, and cocatalyst, in the LSPR enhanced photocatalyst. When λ > 420 nm, Au /g-C 3 N 4 has hydrogen production of 159.9 μmol g −1 h −1 . Our findings confirm the significance of metal plasma in photocatalytic reaction and benefit designing photocatalysts with boosting performance.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Hao Luo,Jiaxin Yan,Yiwei Shan,Jianwen Zhou,Jun Yu,Bruno Boury,Hui Wu,He Xiao,Liulian Huang,Zhanhui Yuan,Lihui Chen
Rational design of efficient semiconductors for photocatalytic nitrogen fixation is an urgent challenge for artificial ammonia (NH 3 ) production under mild condition. Recently, graphitic carbon nitride (g-C 3 N 4 , CN) shows fascinating potential in photocatalytic nitrogen fixation under visible light. However, compared with other catalysts, the low NH 3 production with pure CN leads to the restriction of practical application. Herein, we covalently coupled covalent organic frameworks (Tptta-COF) and carboxylated carbon nanotubes (CNT) onto CN with amido-linkage and imine-linkage, respectively, through the hydrothermal reaction. Compared with the pristine CN, the obtained COF/CN/CNT achieved larger specific surface area, more visible light absorption and more efficient separation of the photo-generated carriers. The optimal catalyst (COF/CN/CNT) exhibited enhanced photocatalytic activity with NH 3 conversion of 864 μmol·g −1 within 4 h under visible light illumination. Moreover, the introduction of COF and CNT results in a 6.20 times improved photocatalytic NH 3 conversion rate (211 μmol·g −1 ·h −1 ) under visible light in contrast to that of the pure CN. The boosting NH 3 production is due to the dual covalent decoration effect of COF and CNT. On the one hand, the COF introduction is favorable for the regulation of band gap, promoting specific surface area as well as N 2 adsorption ability. On the other hand, the CNT introduction not only enhances optical light harvesting, but also accelerates the transfer of photo-excited electron, maintaining high efficient separation of photo-generated carriers. This dual covalent decoration, therefore, shows a potential as a feasible strategy of combining light-harvesting and charge transfer for efficient NH 3 production.
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2022
·
IF 4
Afzal Ali,Tahir Raza,Adeel Ahmed,Muhammad Safdar Ali,Changbao Liu,Dong Li,Chunhu Li
The intentional discharge of polycyclic aromatic hydrocarbons (PAHs) into the aquatic system from different industrial units has posed a serious threat to human health. To address the concerns associated with PAHs misuse, an efficient approach for developing affordable photocatalyst materials for PAHs degradation is much needed. In this study, we have explored co-precipitation and hydrothermal methods to synthesize Fe 3 O 4 /GO/g-C 3 N 4 ternary composites and utilized them as photocatalyst materials for the degradation of naphthalene. Fe 3 O 4 /GO/g-C 3 N 4 nanocomposite demonstrated superior degradation performance, with 87.56% naphthalene degradation achieved in 140 min under visible light irradiation, far outperforming Fe 3 O 4 /GO (77.42%) and Fe 3 O 4 (69.42%). The enhanced degradation of naphthalene by the Fe 3 O 4 /GO/g-C 3 N 4 composite was credited to the effective charge carrier separation and increased visible-light absorption induced by GO and g-C 3 N 4 . The impact of operating parameters on the catalytic efficiency of the Fe 3 O 4 /GO/g-C 3 N 4 catalyst was also examined. The findings of this study revealed that lower naphthalene concentration (10 mg/L), higher catalyst dosage (40 mg), and moderate pH conditions (pH 5 to pH 9) were favorable for photocatalytic activity. The degradation of naphthalene followed pseudo-first-order kinetics with a rate constant value of 0.0137 min −1 . The generation of radicals ( • OH and O 2 •− ) liable for the degradation of naphthalene was corroborated through electron paramagnetic resonance analysis and quenching experiments. Furthermore, the Fe 3 O 4 /GO/g-C 3 N 4 photocatalyst exhibited promising reusability in five consecutive cyclic runs, validating its excellent stability.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Chun Yang,Feng Zhang,Xiao Liu,Yuxin Du,Di Huang,Jun Liu,Lixia Xie,Guiyin Zhou,Jianxin Tang
An important issue in photocatalysis is the light required to carry out the catalytic reaction, so maintaining photocatalytic reaction activity in the dark has been the ultimate target of expanding photocatalytic technology. Herein, we report a photocatalyst g-C 3 N 4 /SrAl 2 O 4 :Eu 2+ ,Dy 3+ through a strategy that couples the energy-storing and light-releasing properties of long afterglow materials and the light-absorbing properties of photocatalytic materials. g-C 3 N 4 /SrAl 2 O 4 :Eu 2+ ,Dy 3+ is able to effectively degrade methyl orange in water under visible light using molecular oxygen in the air, but it maintains significant methyl orange degradation activity after the light is turned off, as if SAO acts as a built-in light source in it. The photocatalytic degradation mechanism is investigated by active species capture experiments, which shows that superoxide radicals (•O 2 − ), hydroxyl radicals (•OH), holes (h + ), and singlet oxygen ( 1 O 2 ) generate during the photocatalytic process. Among them, •O 2 − is the relatively predominantly acting reactive species. This study exemplifies the design of a continuously working photocatalyst with conceptual value for light storage, which provides ideas for practical energy and environmental system applications.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Hua Chai,Chunyan Yang,Peng Xu,Peng Wang,Jianhua Qu,Guangshan Zhang
Heterojunction photocatalysts Fe 2 O 3 –ZnO@C/g-C 3 N 4 (FZCCN) were prepared by precipitation and calcination in this study. Systematic characterization demonstrated that the tight interfacial contact was established between Fe 2 O 3 –ZnO@C and g-C 3 N 4 , and the FZCCN-4 (theoretical mass ratios of ZnO and g-C 3 N 4 was 4) had large BET surface area (110.136 m 2 g −1 ). Bisphenol A (BPA) was selected to estimate the photocatalytic properties of FZCCN and the degradation reaction kinetics was analyzed at the same time. The results showed that, FZCCN-4 had the highest removal rate of BPA (100%, 60 min). The degradation rate of BPA by using FZCCN-4 was approximately 32 and 130 times higher than that of g-C 3 N 4 and Fe 2 O 3 –ZnO@C, respectively. ·O 2 − was proved to be the main active species by capture experiment and electron spin resonance. The UV–vis and PL results proved the formation of heterojunction in FZCCN. This study also identified the intermediates of BPA degradation and tested their toxicity. The excellent visible light catalytic performance of Fe 2 O 3 –ZnO@C/g-C 3 N 4 makes it an ideal material for degrading contaminants.
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Qin Yingfeng,Huang Ruiqi,Ye Gao-Jie
The analysis of glyphosate is essential to agricultural production, environment protection and public health. Herein, we proposed a fast and convenient “on-off-on” fluorescence platform for sensitive detection of glyphosate via Cu2+ modulated g-C3N4 nanosheets. The fluorescence of the system was quenched by Cu2+. With the presence of glyphosate, the fluorescence could be restored due to the formation of Cu2+- glyphosate complex. The proposed method was cost-effective with label-free and enzyme-free. Moreover, it exhibits high sensitivity with a low detection limit of 0.01 μg/ml. Furthermore, the proposed method has been successfully monitored glyphosate in real samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOELECTROCHEMISTRY
·
2022
·
IF 5.76
Xianhua Shi,Yixuan Xie,Linxi Chen,Jing Lu,Luyong Zhang,Duanping Sun
Zeolitic imidazolate frameworks (ZIFs), a famous subfamily of metal-organic frameworks (MOFs), are considered promising electrocatalysts. Herein, ZIF-67 was selected as an electrocatalyst for designing electrochemical sensors due to having the best electrocatalytic activity in ZIFs. To overcome the insufficient electrocatalytic activity of ZIFs, ZIF-67 derivatives (QZIF-67-X, where X represents calcination time) were obtained by calcining at 250 °C for a certain time. The porous structure of the precursor in QZIF-67-X is maintained, exposing more active centers. QZIF-67-X could accelerate electron transfer and lead to improve the electrocatalytic performance. Moreover, QZIF-67-2 was chosen as an Au nanoparticle-supported nanocarrier to further bind G-quadruplex/hemin DNAzymes with strong catalytic activity due to the best supporting activity of QZIF-67-2 among QZIF-67-X. The synergistic catalysis of QZIF-67-2 and G-quadruplex/hemin DNAzymes effectively amplified the reduction current signal of H 2 O 2 . The linear range of the prepared electrochemical sensor was 2 μM-65 mM, and the detection limit was 1.2 μM. Moreover, the real-time detection of H 2 O 2 from HepG2 cells was achieved by the sensor, providing a novel technique for efficient anticancer drug evaluation. These results suggested that QZIF-67 can be utilized as an efficient electrocatalyst for improving the sensitivity of sensors.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2022
·
IF 5.141
Qiusha Li,Shuzhen Peng,Yun Chang,Mujing Yang,Dandan Wang,Xiaoshun Zhou,Yong Shao
G-triplex (G3), as an intermediate of G-quardruplex (G4), is a typical non-classical DNA topology with three G-tracts, formed by folding guanine-riched DNA sequences. The flexibility and tunability of G3-folding structures can provide a versatile platform for analytes sensing. However, current researches about G3s on sensing applications, especially on metal ion sensing, are relatively rare. Herein, we first develop a label-free fluorescence switch-on sensing platform based on the G-triplex topology (HtG3) for the specific qualitative identification of chromium species. Coralyne (COR), a molecule probe whose fluorescence can be inhibited by HtG3, is employed to monitor the Cr 3+ binding events with the principle that Cr 3+ could break the parallel HtG3-folding structure to result in COR releasing from HtG3 and its fluorescence recovery. Furthermore, this HtG3 sensing platform we constructed also can be used to indirectly identify CrO 4 2- through reducing it to Cr 3+ with ascorbic acid (AA). Our work will extend the practical application of G3 as a biosensor and inspire wide interests in exploring more non-classical DNA structures.
✓ 已验证
产品关联
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 12
·3377-3388
·
IF 3.146
Sun Shuhan,Li Shiling,Hao Yibing,Yang Xiao,Dou Xiaomin
g/C 3 N 4 -ZnO composite catalysts were synthesized through surface hybridization of the delocalized conjugated- π structure of g/C 3 N 4 with the closely contacted surface of ZnO via a successive and simultaneous calcination procedure, and two kinds of photocatalysts, g/C 3 N 4 -ZnO1 and g/C 3 N 4 -ZnO2, were obtained. Heterojunctions were formed between the two components, which promote the separation of photogenerated carriers efficiently, and then enhanced the degradation of 100 mg/L of AMX The degradation rate of g/C 3 N 4 -ZnO1 was 1.54, 11.33, and 2.52-fold that of g/C 3 N 4 -ZnO2, g/C 3 N 4 and ZnO, respectively, at a 3.5-h reaction period, with the dosage of 0.3 g/L, and solution pH at 7.0±0.2. The recycle and reuse ability was excellent and 90.5% of AMX mitigation was achieved in the fifth cycle. For g/C 3 N 4 -ZnO1, electrons migrated from the conduction band of g/C 3 N 4 to that of ZnO via the heterojunction. ·OH and h + were the main active species for AMX degradation, compared to ·O
− 2
dominated for g/C 3 N 4 . Twelve intermediate products were identified, and two degradation pathways were inferred for g/C 3 N 4 -ZnO1 and g/C 3 N 4 -ZnO2, respectively. Finally, transformation products without lactam rings were achieved, which lost most of the antibacterial potencies, and the ecotoxicity was also dramatically decreased as indicated by the ECOSAR program.
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 20
·6149-6156
·
IF 4.478
Qin Shanshan,Chen Xuliang,Xu Zhichen,Li Tao,Zhao Shuhong,Hu Rui,Zhu Jiang,Li Ying,Yang Yunhuang,Liu Maili
Few reports are found working on the features and functions of the human telomere G-triplex (ht-G3) though the telomere G-quadruplex has been intensely studied and widely implemented to develop various biosensors. We herein report that ht-G3 lights up Thioflavin T (ThT) and establish a sensitive biosensing platform for RNA detection by introducing a target recycling strategy. An optimal condition was selected out for ht-G3 to promote ThT to generate a strong fluorescence. Accordingly, an ht-G3-based molecular beacon was successfully designed against the corresponding RNA sequence of the SARS-CoV-2 N-gene. The sensitivity for the non-amplified RNA target achieves 0.01 nM, improved 100 times over the conventional ThT–based method. We believe this ht-G3/ThT–based label-free strategy could be widely applied for RNA detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Shangyuan Ni,Zhengrong Fu,Lin Li,Manying Ma,Yuelin Liu
Construction of heterojunction between semiconductors is considered an effective strategy for enhancing photocatalytic capability. Herein, this work prepared an abundant porous g-C 3 N 4 /TiO 2 photocatalyst , with the two-dimensional (2D) nanosheet g-C 3 N 4 and nanoparticle TiO 2 . The heterojunction both enhanced the ultraviolet (UV) light absorption ability, and inhibited the recombination of photogenerated electron-hole (h + ) pairs. As expected, the optimal 4 % g-C 3 N 4 /TiO 2 (g-C 3 N 4 :TiO 2 = 1:25) exhibited a prominent degradation efficiency of 96.53 % in the photocatalytic performance of tetracycline hydrochloride (TCH) under UV irradiation . The recycling of the heterojunction photocatalyst g-C 3 N 4 /TiO 2 remained stability and reusability. The main active species were·O 2- , h + and·OH, and the formation of internal electric field on the step-scheme (S-scheme) heterojunction interface accelerated the migration of photogenerated carriers. Moreover, several environmental factors on degradation such as dose, pH, and the initial concentration of TCH were investigated. This work could be spread to the conceive of other S-scheme heterojunction photocatalysts in application to different environmental demands.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jinxing Hou,Guodong Dai,Jiuwu Wang,Xian Sun,Yue Situ,Hong Huang
A novel ternary polythiophene/Ag/protonated g-C 3 N 4 nanosheets (PTh/Ag/pCN) nanocomposite was constructed by electrostatic self-assembly strategy. The as-prepared 5% PTh/Ag/pCN exhibits excellent visible light photocatalytic performance toward methylene orange (MO), which is 6 and 3.7 times higher than pCN and PTh, respectively. The result was dominantly ascribed to the forming of Z-scheme heterojunction due to the synergetic effects of pCN, Ag and PTh, which is conductive to the separation of photogenerated charges. Meanwhile, the radical trapping experiments and ESR techniques proved that the photogenerated holes and superoxide radicals are vital reactive substances. This study provides a powerful approach to enhance catalytic activity of conjugated polymer photocatalyst .
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）