JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 16
·9678-9691
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IF 4.22
Ma Zhongying,Zhang Zhihao,Wang Yuhua
Flame retardant is essential for cotton fabric because of the restrictions in applications caused by poor flammability. Herein, a novel flame-retardant coating assembled on the surface of cotton fabric consists of polyethyleneimine/g-C 3 N 4 and polyethyleneimine/phytic acid as the underlying insulating coating and the upper intumescent coating, respectively. Different amounts of the composite coatings were deposited onto the fabric by the layer-by-layer self-assembled technique. The char residue of TGA over 20 wt% has indicated the significantly enhanced performance of the thermal stability of all the coated samples and the achievement of the samples with composite coatings in a self-extinguished level proving through vertical combustion test. The samples prepared with binary hybrid coatings exhibited a high limiting oxygen index value of 30.5%. From the MCC test, the peak heat release rate and total heat release of (P/G + P/PA) 4+4 showed a significant decrease of 76.9% and 77.1%, respectively. All these results demonstrated that the composite coatings endowed the cotton fabric with outstanding thermal stability and flame retardancy.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yingying Qin,Jian Lu,XinYu Zhao,Xinyu Lin,Yue Hao,Pengwei Huo,Minjia Meng,Yongsheng Yan
The precise molecular tunability strategy is deemed to have great potential to improve the photocatalytic performance of metal-free photocatalysts for applying in hydrogen evolution but remains a formidable task. We herein cover a logical design for integrating N defect engineering and π-conjugation structure into g-C 3 N 4 . The photocatalytic hydrogen evolution rate of up to 1541.6 μmol g −1 h −1 is acquired over the optimum DCN350, which has 7.5-fold increase over primal g-C 3 N 4 (205.9 μmol g −1 h −1 ). The experimental study and density functional theory (DFT) investigations confirm that DCN350 with N defects not only can shorten band gaps for expanding the light absorption range via optimizing the electronic band structure, but also act as active sites for facilitating hydrogen evolution reaction. Besides, the –C≡N as strong electron-withdrawing functional group can make the isolated valence electrons delocalized to drive the charge spatial separation. Therefore, the light absorption capacity and charge separation/transfer of g‐C 3 N 4 can be flexibly mastered via changing calcination temperature of g-C 3 N 4 and NaBH 4 . Overall, this study provides an opportunity for having a deep understanding the role of structural defects on ameliorating the photocatalytic evolution hydrogen activity.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Jin Kang,Yiwu Tang,Min Wang,Chongyue Jin,Jiayun Liu,Siyan Li,Zhilin Li,Jiangwei Zhu
In this study, to enhance the peroxymonosulfate (PMS)-assisted photocatalytic degradation of tetracycline (TC) under visible light over BiVO 4 , g-C 3 N 4 coupling and Na + doping was used to co-modify BiVO 4 to obtain g-C 3 N 4 /Na-BiVO 4 (CN/Na-BiVO 4 ) heterojunction catalyst. The prepared CN/Na-BiVO 4 exhibited the apparently enhanced PMS-assisted photocatalytic TC degradation efficiency and can degrade approximately 98.20% of TC in 40 min, being 3.13 folds of BiVO 4 . The boosted TC degradation over CN/Na-BiVO 4 was ascribed to the Z-scheme heterojunction formation, doped Na + , more V 4+ and oxygen vacancies resulting from Na + doping facilitate the electron-hole pairs migration and separation. Meanwhile, more V 4+ and oxygen vacancies generated in Na-BiVO 4 also promoted the PMS activation . Therefore, a large number of reactive oxygen species (ROSs), including •O 2 − , h + , •OH, SO 4 •− , and 1 O 2 , were produced in CN/Na-BiVO 4 +PMS+Vis system to degrade TC. The mechanism of enhanced PMS-assisted photocatalytic degradation of TC was proposed. This work further highlighted the advantages of the PMS-assisted photocatalytic technology in antibiotics removal and also demonstrated that g-C 3 N 4 coupling and Na doping co-modify BiVO 4 was one effective and feasible method for promoting the PMS-assisted photocatalytic degradation of TC under visible light.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 2
·2146-2157
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IF 2.478
Zhong Chengwei,Wei Wei,He Huan,Huangfu Zhuoxi,Wang YiZheng,Yu Jiang
Heterojunction photocatalytic materials have received extensive attention by the researchers. In this work, g-C 3 N 4 /Bi 2 O 3 /TiO 2 (TCB) composites with g-C 3 N 4 as the main body were synthesized via microwave-assisted ball milling and the heat treatment method. The photocatalytic activity was evaluated by the degradation efficiency of rhodamine B (RhB) and methylene blue (MB) under visible or UV light irradiation. TCB with a mass ratio of melamine/TiO 2 /Bi(NO) 3 ·5H 2 O of 30:1:0.25 has the best photocatalytic performance when fabricated at 450 °C in open air, and the degradation efficiency of the as-prepared material to RhB was 48.07% under visible light and 51.18% to MB under UV. The results of morphological structure analysis revealed that there was a flocculent structure on the edge of the g-C 3 N 4 film and the phase of TiO 2 and Bi 2 O 3 changed. The presence of β-Bi 2 O 3 enhanced photocatalytic efficiency of the as-prepared materials. The optical properties analysis confirmed that the structure of the hybrid samples can promote electron–hole pairs separately at multilayer heterogeneous interfaces and the electron can react with O 2 to yield the · \({O}_{2}^{-}\) radical. In summary, the ability of novel spatial structure materials to absorb visible light is enhanced, which are facilitated for photocatalytic activity and have excellent stability. Therefore, the study of ternary heterojunction photocatalytic materials provides a reference for environmental remediation.
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Environmental Science-Nano
·
2020
·Vol. 8
·期 1
·217-232
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IF 7.683
Kexin Li,Dongxiao Zhao,Yawen Li,Shenglian Luo,Zhentao Zhou
In this article, three types of surface-modified g-C3N4 (H+/g-C3N4, BCQDs/g-C3N4, and H+/BCQDs/g-C3N4) with unique photocatalytic properties have been successfully fabricated by simple and low-cost strategies. The morphology, elemental composition, textural properties, structural information, and photoelectric properties of the as-prepared materials are systematically characterized. Subsequently, the as-prepared materials are applied to Cr(VI) reduction, 4-FP degradation, and simultaneous Cr(VI) reduction with 4-FP degradation photocatalytic systems under normal and anoxic conditions. Based on the photocatalytic test results, we successfully constructed a macro-thermodynamic model to reveal the essential laws of synergistic photocatalytic effects. The constructed macro-thermodynamic model is suitable for complex photocatalytic systems and is of great significance for the application of photocatalytic technology in real wastewater treatment with multiple pollutants.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Min Wang,Chongyue Jin,Jin Kang,Jiayun Liu,Yiwu Tang,Zhilin Li,Siyan Li
In the current work, a CuO/g-C 3 N 4 (Cu/CN) 2D/2D heterojunction photocatalyst was precisely designed to degrade oxytetracycline (OTC) by activating peroxymonosulfate (PMS) under visible light irradiation. The as-fabricated catalysts were explored in detail on the base of the characterization results. The optimum 5Cu/CN can degrade almost 100% of oxytetracycline (OTC) by activating PMS under visible light in 10 min, and also displays high degradation efficiency toward tetracycline (TC), ciprofloxacin (CIP), levofloxacin (LVX) and sulfadiazine (SDZ). Additionally, the effect of experimental conditions on OTC degradation was investigated, and the stability of the catalysts was evaluated. The electron spin resonance (ESR) and quenching results verified the generation of multiple reactive oxygen species (ROS), and the size of their roles in OTC degradation followed the sequence •OH & SO 4 •− > 1 O 2 > h + > •O 2 − . The possible mechanism of higher OTC degradation efficiency in the 5CuO/CN/PMS/Vis system and the OTC degradation pathway were deeply explored. This work supplies a worthy reference for developing an efficient g-C 3 N 4 -based photocatalytic technology for rapid and efficient antibiotic elimination from the environment.
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高影响因子
TALANTA
·
2020
·
IF 5.339
Xuejiao Liu,Qiaoe Wang,Jun Chen,Xu Chen,Wensheng Yang
Highly sensitive determination of tumor exosomes is significant for early diagnosis of cancers and precision therapy. Herein, a sandwich peptide-based electrochemiluminescence (ECL) biosensor was developed for determination of phosphatidylserine (PS)-positive exosomes, a promising biomarker for early diagnosis of ovarian malignancy. A PS-specific binding peptide with high affinity was immobilized on Au nanoflowers (AuNFs) modified biosensing interface for recognition and capture of exosomes. Meanwhile, g-C 3 N 4 nanosheet loaded with luminol capped AuNPs (Lum-AuNPs@g-C 3 N 4 ) nanocomposite was used as the ECL signal nanoprobe. The g-C 3 N 4 nanosheets with large surface area were not only utilized as the carrier to immobilize more peptides for recognition of exosomes but also used to catalyze co-reactant H 2 O 2 decomposition to achieve the ECL signal amplification of luminol-H 2 O 2 system. Under optimal conditions, the biosensor showed superior performances compared with most currently available methods, including wider linear range across 5 orders of magnitude and a lower detection limit (LOD) down to 39 particles μL −1 . Moreover, the biosensor could be applicable for determination of exosomes in complex biological samples. This study indicates the combination of peptide recognition with nanoprobe as a label for signal amplification in sandwich ECL biosensing is a great promising strategy for sensitive and cost-effective determination of exosomes.
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PubMed
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 16
·5205-5218
·
IF 4.174
Xiaoyi Chen,Xiuling Xue,Xiuwen Gong
A number of porous g-C3N4 nanosheet/Ag3PO4/NCDs (PCNNS/AP/NCDs) with little amounts of Ag3PO4 were synthesized via an in situ sedimentation–calcination method. The PCNNS/AP/NCDs photocatalyst exhibited excellent photocatalytic performance for the photocatalytic degradation of tetracycline (TC) under visible light irradiation at a removal rate of 90.5% in 40 min. The study of the reaction kinetics of the as-prepared samples was in accordance with the pseudo-second-order kinetics, with the correlation coefficient (R2) being greater than 0.9776. Meanwhile, the photocatalyst was capable of degrading ciprofloxacin (CIP), and showed good performance even under actual water conditions with natural sunlight irradiation, indicating that the photocatalyst has wide practical applications. In addition, the photocatalytic performance and the XRD and FTIR spectra showed no obvious changes even after four photocatalytic degradation cycles, which revealed the high stability of the PCNNS/AP/NCDs photocatalyst. Furthermore, the possible degradation pathways of TC and the possible Z-scheme mechanism were proposed with ˙O2− and h+ as the main active species contributing to photocatalytic degradation. The results provide a novel insight into the fabrication of Z-scheme PCNNS/AP/NCDs and introduce them as an efficient visible-light-responsive photocatalyst for use in practical applications.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lin Gong,Xiaodong Li,Qi Zhang,Bing Huang,Qiang Yang,Guangcheng Yang,Yousong Liu
Transition metal quantum dots (QDs) are ideal electrocatalysts due to their short ion diffusion path, high atom utilization and effective electron transfer properties. However, a lack of facile and large-scale synthesis strategy limits their industrial production and commercial application. In this study, a triaminoguanidine salt-induced one-step deflagration method is first reported for the ultrafast (hundreds of milliseconds) and gram-scale synthesis of Co 3 O 4 QDs-C 3 N 4 /rGO as an efficient oxygen reduction reaction (ORR) catalyst with high durability. The deflagration reaction process is carefully studied and the formation mechanism is proposed to explain the controllable synthesis of Co 3 O 4 QDs. An optimized sample is capable of achieving an excellent ORR performance in terms of an onset potential of 0.97 V (vs. RHE, equivalent to Pt/C) and the limited current density of −5.33 mA·cm −2 at 0.35 V (vs. RHE, ~7% higher than that of Pt/C). It is believed that this simple and effective synthesis strategy will open up an exciting new avenue to the future design and facile synthesis of Co 3 O 4 or other QDs-based functional materials.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ze Yin,Minguang Han,Zhao Hu,Li Feng,Yongze Liu,Ziwen Du,Liqiu Zhang
For efficient usage of visible light, Pd loading graphitic carbon nitride (Pd/g-C 3 N 4 ) hybrids were synthesized and peroxymonosulfate (PMS) was accompanied to improve the photoactivities of Pd/g-C 3 N 4 . The photocatalytic system consisting of Pd/g-C 3 N 4 , PMS and visible light (Pd/g-C 3 N 4 -PMS-Vis) exhibited higher bezafibrate (BZF) removal efficiency than Pd/g-C 3 N 4 -PMS, Pd/g-C 3 N 4 -Vis, g-C 3 N 4 -PMS, g-C 3 N 4 -Vis, and g-C 3 N 4 -PMS-Vis systems, which can be ascribed to the electron transfer from Pd/g-C 3 N 4 to PMS. Density functional theory (DFT) calculation proved that the chemical bond interaction forming between Pd and g-C 3 N 4 inspired the electron excitation, separation and transportation. Meanwhile, Pd particles with local surface plasma resonance (LSPR) phenomenon could also enhance the visible light adsorption. Notably, the photocurrent response of Pd/g-C 3 N 4 was significantly improved with PMS, demonstrating the photoinduced electrons on Pd/g-C 3 N 4 are capable to immigrate to PMS. The added PMS can perform as electron acceptors, thus favoring the quantum efficiency of photoinduced charge carriers to form SO 4 − . The BZF degradation mechanism was clarified by the addition of different scavengers and the major reaction active species were hydroxyl radicals (OH ) and sulfate radical (SO 4 − ). Four possible pathways in the degradation of BZF were also put forward via LC-MS/MS analysis (R-oxy substituent, oxidation dichlorination, OH-addition and oxidation deaminization). In the 2%Pd/g-C 3 N 4 -PMS-Vis system, an obvious decrease of genetic toxicity was observed because of the high removal efficiency and final low concentration of BZF. The results of this research underlined great prospective of Pd/g-C 3 N 4 catalysts and provided a potential approach to photocatalytically remedy the polluted water by micropollutants.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zhansheng Wu,Xiufang He,Yongtao Xue,Xia Yang,Yunfeng Li,Qubing Li,Bing Yu
The hydrophobicity of MoS 2 /g-C 3 N 4 based photocatalysts remains a major hurdle to their successful application for the remediation of water-soluble contaminants such as herbicides and heavy metals. Herein, we develop new photocatalysts based on the graft of three different cyclodextrins (α-CD, β-CD and γ-CD) on MoS 2 /g-C 3 N 4 composites (CDs/MoS 2 /g-C 3 N 4 ) for the removal of glyphosate and Cr (VI) from simulated agricultural runoff. CDs/MoS 2 /g-C 3 N 4 show remarkably enhanced photocatalytic activities for glyphosate degradation and Cr (VI) reduction compared to pristine MoS 2 /g-C 3 N 4 . In addition, γ-CD/MoS 2 /g-C 3 N 4 exhibits the highest hydrophilicity and photocatalytic activity among these three different cyclodextrins grafted MoS 2 /g-C 3 N 4 . The mechanistic investigation indicates that cyclodextrins can not only increase the accumulation of glyphosate and Cr (VI) onto the surface of CDs/MoS 2 /g-C 3 N 4 but also facilitate the fleet separation of photo-induced electron-hole pairs. In summary, these results collectively imply that the graft of cyclodextrins could be an effective strategy to improve the photocatalytic efficiency of MoS 2 /g-C 3 N 4 composites for the removal of glyphosate and Cr (VI) from simulated agricultural runoff.
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 4
·1145-1159
·
IF 3.186
Yu Guiyun,Zhao Yefan,Zhang Yulong,Wu Jiaxin,Liu Chao
There are increasing concerns of environmental-pollution and energy issues. Herein, an exfoliation-restacking process was firstly employed to synthesize H + -restacked H + Ti 2 NbO 7 − nanosheets (HTNS), and then heated with melamine at 510 °C to obtain direct Z-scheme layered N-doped H + Ti 2 NbO 7 − /g-C 3 N 4 (TCN) heterojunctions with an increased specific surface area. Two-dimensional (2D) g-C 3 N 4 material was in-situ formed on the surface of HTNS to achieve a layered heterostructure between two components, which could maximize interfacial contact area and minimize interfacial distance for the efficient charge carrier separation. Simultaneously, the surface of HTNS was doped by nitrogen atoms to form visible-light-responsive N-doped HTNS. All TCN x ( x = 1, 2 and 3) composites exhibited the enhanced photocatalytic activity for both hydrogen (H 2 ) production and rhodamine B (RhB) degradation. As an optimal sample, the resulted TCN2 composite exhibited the best photocatalytic efficiency for H 2 production and RhB degradation. The enhanced photocatalytic activity was assigned to the combined effects of layered heterojunction, N-doping and large specific surface area. According to trapping experiments and electron spin resonance (ESR) spectra, the holes (h + ), superoxide (·O 2 − ) and hydroxyl (·OH) radicals were responsible for photocatalytic RhB degradation and especially the ·O 2 − was the key active specie. A possible charge transfer pathway was analyzed in detail. This work will hopefully provide some guidance on designing Z-scheme layered heterojunction photocatalyst systems with highly photocatalytic efficiency. Graphical Abstract Direct Z-scheme layered N-doped H + Ti 2 NbO 7 − /g-C 3 N 4 heterojunction photocatalysts were constructed by a three-step exfoliation-restacking-calcination process, showing the highly photocatalytic efficiency for H 2 production and RhB degradation under visible light due to the synergistic effects of layered heterojunction, N-doping and large specific surface area.
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