APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zihan Yang,Jingkai Yang,Lixia Li,Wanning Cao,Jiao Zhang,Hongli Zhao,Liqin Wang
The challenge of creating effective S-scheme visible-light photocatalysts persists due to the inactive visible-light-driven component and the low band-gap characteristics of semiconductors. In this work, we developed a novel F-BiVO 4 /g-C 3 N 4 /CdS dual S-scheme photocatalyst using a sonochemical method. The removal efficiency of Cr(VI) and ciprofloxacin (CIP) can reach 98 % and 90 % in 5 min and 30 min, respectively, under simulated solar illumination. The excellent photocatalytic activity can be attributed to the efficient carrier separation and transport with the help of internal electric field at the interface. This work also reveals the reduction process of Cr(VI), as well as the intermediates and pathways involved in the CIP degradation, taking into account practical situations and expanding its potential applications. This research presents promising prospects for the design of bismuth-based dual S-scheme heterojunctions in the field of environmental remediation.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Hua Zhou,Liangdong Ye,Shanrong Li,Ziwei Li,Zhouqiao Wei,Zhiyi Huang,Shaorong Lu,Dongming Chen,Zuocai Zhang,Yuqi Li
Compatibilizers allow for the combination of two materials with vastly different polarities. The dosage of most compatibilizers must be more than 5 wt% to be effective—an expensive high dosage level that changes polymer composite properties. Thus, in this study, renewable resource epoxidized soybean oil (ESO) was used as the raw material to synthesize the end-hydroxyl group bio-based compatibilizer ESO-g-S-HPG. The experimental results revealed that composites prepared with ESO-g-S-HPG had better mechanical properties (i.e., tensile strength , impact strength , and energy storage modulus) than those prepared with a commercially available compatibilizer (TA 1618). The addition of 1 wt% of ESO-g-S-HPG significantly enhanced the interfacial compatibility between the HDPE and CaCO 3 , making it a good candidate for application in the field of HDPE composite filling and reinforcement, as evidenced by the minimal voids revealed by the scanning electron microscopy results. The molecular dynamics simulation results revealed that hyperbranched compatibilizers can eliminate filler aggregation and enhanced filler-matrix interaction, yielding effects that are better than those of linear compatibilizers. The compatibilizer proposed here can be a useful material for the fabrication of the next generation of composites applied in diverse industrial fields.
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高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Fang-yan Chen,Min-keng He,Yu-bin Tang,Cheng-yi He,Ke-ke Shu,Ming-yang Li
A core-shell g-C 3 N 4 /SiO 2 nanocomposite was successfully synthesized by depositing g-C 3 N 4 , obtained from the sublimation of melamine and subsequent polymerization reaction in the gaseous phase, on the nano-silica. The as-prepared g-C 3 N 4 /SiO 2 was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N 2 adsorption–desorption, UV-vis diffuse reflectance spectroscopy. The visible-driven photocatalytic activity of g-C 3 N 4 / SiO 2 was evaluated by the degradation of tetracycline. The results indicate that the specific surface area of g-C 3 N 4 /SiO 2 is 97.32 m 2 /g, which is 6.74 times as high as that of bulk g-C 3 N 4 (14.44 m 2 /g). Compared to bulk g-C 3 N 4 , g-C 3 N 4 /SiO 2 composite exhibits significantly enhanced photocatalytic activity for degradation of tetracycline and can degrade 72.7% of tetracycline within 60 min under visible-light irradiation. The photodegradation rate constant of tetracycline over g-C 3 N 4 /SiO 2 is 7.2 times as high as that over bulk g-C 3 N 4 . The greatly enhanced photocatalytic activity of g-C 3 N 4 /SiO 2 is due to coupling enlarged surface areas with the contribution of SiO 2 in inhibition of the recombination of photo-induced electron-hole pair.
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 14
·4653-4661
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IF 6.177
Gao Xiao,Huiying Lin,Yiting Lin,Liyin Chen,Xiancai Jiang,Xia Cao,Samson Afewerki,Yujuan Zhang,Weixia Zhang
Oxygen reduction reaction (ORR) electrocatalysts that are stable, highly efficient, and cost-effective play a significant role in the development of energy storage and conversion technologies. Transition metal carbonitrides have been investigated as an alternative to precious metal-based catalysts. Developing noble metal-free two-dimensional (2D) carbon-based materials for efficient ORR electrocatalysts can reduce the consumption of noble metals; more importantly, these materials have the advantages of being highly abundant, having a large active surface area, being easy to functionalize, and being chemical stable. Herein, we exquisitely designed the in situ growth of Co nanoparticles coated with tannin-carbon (CTA) embedded on hierarchical porous two-dimensional ultrathin g-C3N4 nanosheets (Co–CTA@g-C3N4), through the thermal transition of cobalt–polyphenol-networks modified graphitic carbon nitride (Co–TA@g-C3N4) by virtue of the excellent interfacial adhesion ability of an ortho-phenolic hydroxyl group in tannic acid (TA) to metal ions. By carefully tuning the Co/TA molar ratio in the Co–TA@g-C3N4 precursor and the carbonization temperature, an active stable ORR catalyst of the hybrid 2D Co–CTA@g-C3N4 heterostructured nanosheet is obtained. The results reveal that Co2.5–CTA1@g-C3N4-700 °C exhibits outstanding ORR activities, including outperforming the commercial 20 wt% Pt/C with a more positive half-wave potential of −0.864 V versus Ag/AgCl and high selectivity to the four-electron pathway (n ≈ 3.7), as well as outstanding stability and methanol tolerance.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Yong-Ting Li,Xiao-Li Zhang,Zhi-Kun Peng,Pu Liu,Xiu-Cheng Zheng
It is a crucial and urgent task to develop high performance catalysts for the hydrolysis of ammonia borane (NH3BH3, AB), which is presently thought to be an effective strategy for hydrogen generation. In this work, we immobilize the ultrafine RuNi alloy nanoparticles in the network of hierarchical porous g-C3N4 thin sheets with a facile adsorption–in situ reduction method. The structural and physicochemical properties of the as-prepared catalysts are studied using various techniques. The influence of different molar ratios of Ru to Ni in the catalysts on the hydrolytic dehydrogenation rate of AB is investigated to optimize the best one. The detailed reaction kinetics and the enhancing effect of NaOH with different dosages on the hydrolysis rate are studied through a series of experiments. Catalyzed by the optimal catalysts (denoted as Ru0.5Ni0.5/p-g-C3N4), the hydrolysis reaction is first-order and near zero-order relative to the Ru and AB concentrations, respectively. The corresponding turnover frequency reaches 840.3 min–1, and the apparent activation energy is as low as 14.1 kJ mol–1, which are greatly superior to many similar or counterpart catalysts previously reported. The results indicate the potential of the bimetallic alloy catalysts for the hydrolytic dehydrogenation of hydrogen storage materials.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Chunli Cui,Genrui Zhang,Yu Yang,Tingting Wu,Lei Wang
Constructing heterojunction has been proved to be an efficient strategy for enhancing the photocatalytic performance of g-C 3 N 4 by prohibiting charge recombination and providing surface active sites. Herein, a novel structure of ultra-thin carbon bridged MoC quantum dots/g-C 3 N 4 nanosheets was constructed for the first time to facilitate carrier transfer and accelerate surface reactions. In our designed composites, a surface-to-surface contact has been formed between conductive carbon layer and g-C 3 N 4 nanosheet via ultrasonic assembly process. Moreover, there exist strong interfaces between MoC QDs and carbon layer because of the in-situ conversion method. As to this unique structure, the ultra-thin carbon layer functions as charge separation and migration high ways while the MoC QDs perform as noble-metal-free co-catalysts consuming the surface electrons promptly. Significantly, an optimal 40 wt% MoC QDs-C/g-C 3 N 4 photocatalyst (MCCN) is synthesized with a hydrogen evolution rate of 2989 μmol h −1 g −1 , which is 69.6 and 1.7 times higher than that of pure g-C 3 N 4 and Pt/g-C 3 N 4 , respectively. Our work provides new insights on designing highly efficient heterojunction photocatalysts for water splitting.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiaoqi Jiang,Qing Li,Wenjie Xia,Zhiwei Huang,Xiaomin Wu,Huawang Zhao,Zhilei Guo,Weixin Kong,Chung-shin Yuan,Guohua Jing,Huazhen Shen
Elemental mercury (Hg 0 ) is the most difficult mercury species to remove from the flue gas. Photocatalysts of transition metal oxide modified TiO 2 can effectively remove Hg 0 . However, the metal oxide easily aggregates into large nanoparticles, reducing the atom utilization efficiency and photocatalytic activity. We presented a facile strategy of employing g-C 3 N 4 as an anchor to successfully load highly dispersed ultrasmall CeO 2 clusters on g-C 3 N 4 /TiO 2 . Moreover, the mechanism of anchoring CeO 2 clusters and charge transfer of the ternary photocatalyst were explored in-depth. The results demonstrated that at 250 °C, the photooxidation efficiency of Hg 0 by CeO 2 -g-C 3 N 4 /TiO 2 was several times higher than that of CeO 2 /TiO 2 , TiO 2 , and g-C 3 N 4 . The cavity of the tri-s-triazine ring anchored small CeO 2 clusters via strong Ce-N coordination bonds. A combined type II and Z-scheme transport paths accelerated the separation of photogenerated electron holes. This research offers valuable surface engineering strategy for highly dispersed ultrasmall cluster decorated TiO 2 .
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Suci Meng,Pengfei An,Lijie Chen,Shichao Sun,Zhongkai Xie,Min Chen,Deli Jiang
Developing high-efficient and low-cost photocatalysts is of great significance yet challenging for photocatalytic hydrogen evolution. Herein, we report a 2D/2D Ru-modulated CoP nanosheets (Ru-CoP -x , where x refers the Ru-to-Co molar ratio)/g-C 3 N 4 nanosheets (GCN NSs) ternary hybrid as a photocatalyst for hydrogen evolution under visible light. The optimal photocatalyst 25% Ru-CoP-1:8/GCN NSs exhibits an excellent hydrogen evolution rate of 1172.5 µmol g −1 h −1 under visible light with a high apparent quantum efficiency (AQE) of 3.49% at 420 nm, which is close to Pt/g-C 3 N 4 photocatalytic system and higher than most reported transition metal phosphides (TMP)/g-C 3 N 4 photocatalytic system. Experimental results indicate that the higher photocatalytic hydrogen evolution performance can be mainly attributed to the binary Ru-CoP -x co-catalyst with efficient charge separation and promoted surface water reduction kinetics, and the 2D/2D self-assembly structure with strong interface Schottky effect and short charge transport distance. This study provides a new approach to develop cost-effective Pt-alternative co-catalysts for photocatalytic hydrogen evolution by incorporating a small amount of ruthenium into the transition metal phosphides.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 22
·17587-17598
·
IF 2.779
Yu Bo,Miao Chun,Wang Dandan,Li Hongji,Sun Dongshu,Jiang Wei,Liu Chunbo,Che Guangbo
The development of high-efficiency heterojunction with improved photocatalytic property is regarded as a promising way to decontaminate wastewater. In this study, Z-Scheme g-C 3 N 4 /H-TiO 2 heterojunctions with different proportions were synthesized. The photocatalytic degradation of rhodamine B (RhB) was studied under visible light irradiation. Among them, 10% g-C 3 N 4 /H-TiO 2 photocatalyst had the best performance, and the degradation rate of RhB was 65% within 120 min. In addition, 10% g-C 3 N 4 /H-TiO 2 photocatalyst had high stability, and its photocatalytic activity did not decrease significantly after four cycles. Through photocurrent analysis, it is found that the photogenerated carriers have obviously excellent separation and transfer characteristics, which makes the 10% g-C 3 N 4 /H-TiO 2 photocatalyst have good degradation performance. Electron paramagnetic resonance (ESR) experiments showed that ·OH and ·O 2 − were active radicals during degradation.
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Tianxu Zhang,Fei Chang,Yingfei Qi,Xinyi Zhang,Jieya Yang,Xiaoqi Liu,Shijie Li
In this investigation, a facile alkali-free one-pot synthetic protocol was developed to construct binary SnO 2 / g -C 3 N 4 composites for sake of environment friendliness. These composites were systematically characterized by various analytical techniques. X-ray powder diffraction (XRD) patterns, Fourier-transform infrared spectra (FT-IR), and X-ray photoelectron spectra (XPS) identified the coexistence of both components that were closely combined to generate heterojunction structures proven by high resolution transmission electron microscope (HRTEM) observations. These binary composites showed enhanced photocatalytic performance over methyl orange decolorization under visible light irradiation in comparison to bare g -C 3 N 4 , mostly attributing to morphological harmony of both ingredients, formation of heterojunction domains, and well-aligned band structures. Besides, the satisfactory reusability and structural stability of composites were identified. Basing on entrapping experiments and electron spin resonance (ESR) analyses, a possible photocatalysis mechanism was preliminarily inspected. It was noted that the variation of real weight percent of SnO 2 in composites was constrained to some degree, which should be settled in future work by appropriate modifications of such synthetic protocol.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yanmei Xing,Liying Yin,Yingnan Zhao,Zhilu Du,Hua-Qiao Tan,Xing Qin,Wingkei Ho,Tianyu Qiu,Yang-Guang Li
The reasonable construction of heterojunction photocatalysts with clear nanostructures and a good interface contact especially the one-dimensional/two-dimensional (1D/2D) composite heterojunction with unique morphology is considered one of the most effective strategies for designing highly efficient photocatalysts. Herein, a series of the 1D β-keto-enamine-based covalent organic framework (COF)/2D g-C3N4 composite materials COF–CN (1:x; where 1:x represents the mass ratio of COF and g-C3N4, x = 2.5, 5, 10, 15, 20) is prepared through the in situ reaction of 2,4,6-triformylphloroglucinol (Tp) and benzidine (BD) in stripped g-C3N4 suspension. A series of characterizations, such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), have verified their 1D/2D heterojunction structure. With the introduction of 1D COF nanobelts, the absorption of the composite is largely extended to 560 nm. Photocatalytic experiments reveal that the composite COF/CN shows evidently superior photocatalytic performance than individual COF and g-C3N4. The optimized COF–CN (1:10) exhibits a H2 production rate of 12.8 mmol g–1·h–1 under visible-light (λ ≥ 420 nm) irradiation, which is about 62 and 284 times higher than those of COF and g-C3N4, respectively. The apparent quantum efficiency (AQE) of COF–CN (1:10) is about 15.09% under 500 nm light irradiation, which is one of the highest among previous COF- or g-C3N4-based materials. This work provides important strategies for designing and constructing high-efficiency heterojunction photocatalysts with multidimensional features.
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高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 30
·2201330
·
IF 6.389
Yaping Wang,Meiyang Liu,Yi Zhang,Qingfeng Yi,Ruowei Yi
Herein, a combined method for planetary ball milling and pyrolysis of g-C 3 N 4 /cobalt phthalocyanine mixture to synthesize Co nanoparticles loaded on C N nanosheets ( g -C 3 N 4 @CoPc- x with different mass ratios x of g-C 3 N 4 :CoPc) is proposed. The synthesized catalysts exhibit a unique 3D open sheet-like structure, and the average size of Co particles is 4.45 nm while encouragingly, a small amount of quasi single-atom cobalt (mean particle size 0.5 nm) is also found in the samples. In addition, the mass ratio of g-C 3 N 4 to CoPc presents a significant effect on ORR activity of the samples. Among the samples, g-C 3 N 4 @CoPc-3 shows excellent ORR performance with the onset potential of 0.94 V in neutral condition and the half-wave potential of 1.00 V in alkaline condition, both better than Pt/C. Its onset potentials in acidic (0.83 V) and alkaline (1.07 V) conditions are also comparable to Pt/C. In a full pH range (acidic, alkaline, and neutral) electrolyte, the prepared samples catalyze ORR via a direct four-electron reaction pathway, and the C 3 N 4 @CoPc-3 reveals high catalytic stability and high anti-alcohol tolerance. Results provide wide feasibility for the synthesis and application of g-C 3 N 4 @CoPc-3 in fuel cells.
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高影响因子
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