RSC Advances
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2023
·Vol. 13
·期 45
·31820-31834
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IF 3.9
Peiyao Xiong,Qian Li,Qijun Tang,Haiqiang Wang,Zhongbiao Wu
In this study, alkali-metal-doped crystalline g-C3N4 with an enriched cyano group was synthesized using the molten salt method and used for the visible-light photocatalytic degradation of methylamine (MA), a common organic amine compound with a low odor threshold. Different types and proportions of melting salts (Li, K, and Na) were added during secondary calcination to regulate the morphology, crystallinity, and surface defects of graphitic carbon nitride (g-C3N4). With molten salt treatment matched the melting point of the binary salt system, a cyano group and alkali metal co-doped crystalline g-C3N4 with a high surface area and good crystallinity were prepared. Co-decorating the alkali metal and cyano groups on crystalline g-C3N4 facilitated the adsorption of MA, realized an excellent photo-charge transfer efficiency, and generated more superoxide radicals. Compared with pristine g-C3N4 (PCN), the apparent rate constant of LiK15 : 5-CCN for the degradation of MA increased by 10.2 times and the degradation efficiency of 1000 ppm MA gas was 93.1% after 90 min of irradiation with visible light, whereas the degradation efficiency of PCN was 19.2%.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Jiayou Liu,Xiaoxiang Huang,Lizhen Hu,Penglei Liu,Liuhu Jia,Keiko Sasaki,Zhongchao Tan,Hesheng Yu
Simultaneous avoidance of secondary air pollution and catalyst deactivation remains a challenge for existing photocatalytic removal of nitric oxide (NO). Herein, a photocatalysis-adsorption (P-A) heterojunction is synthesized for eco-friendly NO removal by facilely grinding Pd single atoms (Pd 1 ) anchored g-C 3 N 4 (48CN/Pd) with UiO-66-NH 2 (UION). Under visible-light irradiation, the 40UION-CN/Pd composite shows 93.91 % of NO removal efficiency with only 2.73 % of NO 2 emissions and negligible catalyst deactivation. The DeNO x index increases remarkably from −0.66 for 48CN/Pd to 0.86 for 40UION-CN/Pd. Furthermore, the synthesized P-A heterojunction efficiently removes NO from real flue gases produced by a domestic coal-fired stove and from SO 2 -rich flue gases. The mechanism exploration based on experimental investigations and density functional theory (DFT) calculations reveals that UION captures the NO 2 selectively produced by 48CN/Pd, simultaneously suppressing NO 2 emissions and refreshing active sites for NO photooxidation. Moreover, the results of X-ray photoelectron spectroscopy (XPS), charge density difference calculation, energy-resolved distribution of electron traps (ERDT) and in-situ Kelvin probe force microscopy (KPFM) reveal that the built-in electric field and Type-II heterojunction formed between 48CN/Pd and UION promote the separation of photogenerated carriers, enhancing the catalytic activity of the composite. This work provides an innovative strategy to avoid NO 2 emission and catalyst deactivation during photocatalytic NO removal.
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NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 48
·22050-22062
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IF 3.3
Hui-Qin Zheng,Wen-Li Zhang,Min-Cai Yin,Yao-Ting Fan
In the present work, a ternary composite MoS2/soluble g-C3N4/CdS was synthesized using a facile one-pot hydrothermal reaction and conventional reflux reaction method. The composition, morphology, and properties of the ternary composite were characterized. The photocatalytic performance of the ternary composite was evaluated for hydrogen generation under LED lamp irradiation (450 nm < λ < 465 nm) with lactic acid (LA) used as a sacrificial reagent. The results demonstrated that the maximum hydrogen production reached 4869.6 μmol under the optimal hydrogen production conditions, including a composition of 20% soluble g-C3N4, 9% MoS2, a solution pH of 1, and an irradiation time of 6 hours. The corresponding hydrogen production rate for the ternary composite was calculated to be 8116 μmol g−1 h−1. Furthermore, a possible electron transfer mechanism of the ternary composite system was briefly explored. The interaction and synergistic effects between MoS2, soluble g-C3N4, and CdS in the ternary composite likely facilitate efficient electron transfer, resulting in enhanced photocatalytic activity for hydrogen production. Mechanistic research showed that the electron transfer pathway represented either a double or single type II heterojunction photocatalytic system.
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SOLID STATE SCIENCES
·
2023
·
IF 3.5
Qiqi Huang,Fuxiao Zhu,Feiyan Xiao,Gongliang Zhang,Hongman Hou,Jingran Bi,Shuang Yan,Hongshun Hao
In recent years, using external mechanical energy to solve environmental pollution problems has gradually become a promising strategy, such as piezoelectric catalysis and piezoelectric photocatalysis . In this paper, a series of HKUST-1/g-C 3 N 4 composite materials were successfully synthesized by the combination of g-C 3 N 4 with S-vacancy and porous HKUST-1 semiconductor. Under visible light irradiation and ultrasonic action, the catalytic activity of HKUST-1/g-C 3 N 4 on RhB degradation was investigated. When the mass ratio of HKUST-1 to g-C 3 N 4 is 1:0.3 during the process of piezoelectric photocatalysis, the as-prepared HKUST-1/g-C 3 N 4 composite had the best RhB degradation performance up to 94.42%, which is about 2.83 times that of visible light and 3.56 times that of ultrasonic waves. According to the result of the trapping experiment, the process of piezo-photocatalytic reaction could produce the number of reactive oxygen species (ROS), and the hydroxyl radical (•OH) was crucial in the breakdown of pollutants.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2023
·
IF 3.8
Hadeel A. Khayoon,Mohammed Ismael,Abbas Al-nayili,Hassan A. Alshamsi
LaFeO 3 -nitrogen deficient g-C 3 N 4 (LaFeO 3 -g-C 3 N 4 -H) heterostructure has been fabricated obtaining thermal polymerization of acetic acid-treated melamine followed by incorporation of perovskite-type LaFeO 3 onto the graphitic carbon nitride nanosheets (g-C 3 N 4 ) using La(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 ·9H 2 O as precursors. The as-synthesized nanocomposite was investigated using Fourier Transform Infrared Spectroscopy (FT-IR), powder X-ray diffraction (XRD), UV–Vis Diffuse Reflection Spectroscopy (UV–Vis DRS), Scanning Electron microscope (SEM), and Transmission Electron microscope (TEM). The findings of the characterization study revealed the successful incorporation of LaFeO 3 on g-C 3 N 4 -H nanosheets. The band gap energy of LaFeO 3 -g-C 3 N 4 -H heterojunctions was found to be active in the visible light region. The LaFeO 3 -g-C 3 N 4 -H ability to degrade Rhodamine B (RhB) dye in an aqueous solution was investigated under sunlight illumination. The results of photocatalytic degradation activity showed that LaFeO 3 -g-C 3 N 4 -H photocatalyst has presented the highest photocatalytic efficiency of 99.5% after 60 min under sunlight irradiation. The remarkable photocatalytic activity can be attributed to the defect structure of g-C 3 N 4 and the construction of heterojunction. In addition, LaFeO 3 -g-C 3 N 4 -H showed promise recyclability after 5 cycles with slight activity reduction.
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CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Zhenbang Xie,Qihang Liu,Haixin Zhao,Hongtai Chen,Guozhi Jia,E. Lei,Chao Wang,Yongzhu Zhou
The low charge separation and transfer of g-C 3 N 4 hinders its industrial application in photocatalytic hydrogen evolution. Here, we design a novel co-catalyst strategy to integrate Ag 2 Se nanoparticles in situ on the surface of g-C 3 N 4 . The optimized photocatalyst, 15% Ag 2 Se/g-C 3 N 4 , demonstrates remarkable photocatalytic efficiency in the hydrogen evolution rate, reaching to 1102.8 μmol·g −1 ·h −1 , 7 times higher than g-C 3 N 4 . To further elucidate the photocatalytic activity of 15% Ag 2 Se/g-C 3 N 4 , we present a possible mechanism based on various characterizations and density functional theory calculations. This research offers potential insights for the future development of silver chalcogenide composites in photocatalysis.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 40
·18659-18670
·
IF 3.3
Zhentao Wang,Waheed Iqbal,Jingjing Wang,Ninghui Chang,Chuanguang Qin
Degrading dye waste using inexpensive synthetic photocatalysts is intriguing since it provides the dual advantage of treating water and managing waste simultaneously. There is considerable interest in the construction of heterojunctions for their efficiency in using solar energy for the degradation of wastewater contaminants and enhancing the solar conversion efficiency. Herein, BiVO4 microspheres and 2D g-C3N4 nanosheets were used to synthesize a direct Z-scheme BiVO4/g-C3N4 heterojunction through a hydrothermal calcination approach. The distinct 0D/2D intimate contact heterostructure displayed a high interfacial area and broader visible-light absorption range together with high photoexcited charge pair mobility. Optimizing the content of the BiVO4 microspheres in the heterostructure led to the maximum efficiency for the visible-light photodegradation of rhodamine B (RhB), which was about 12.5 and 2.4 times higher than that for pure BiVO4 and g-C3N4, respectively. Moreover, the quenching effects of various scavengers demonstrated that ˙O2− and ˙OH radicals were the principal active species responsible for ameliorating the photocatalytic performance for RhB degradation. The demonstrated strategy for boosting the photocatalytic performance with Z-scheme systems may help the advancement of high-performance photocatalysts for sustainable and efficient pollutant degradation and energy applications.
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FUEL
·
2023
·
IF 7.4
Rongxin Cao,Hui Yuan,Ning Yang,Qihong Lu,Yuxiong Xue,Xianghua Zeng
Two-dimensional sulfide is considered as one of the best alternative for noble metal cocatalyst, whereas few-layered 1T WS 2 structure is very helpful to promote the photocatalytical activity for hydrogen generation. Herein, few-layered 1T-WS 2 /g-C 3 N 4 composites have been prepared via a facile one-step calcination route and used as a noble metal-free catalyst for H 2 evolution. The results showed that the optimized 1T-WS 2 /g-C 3 N 4 has a H 2 evolution rate of 10.08 mmol∙g −1 h −1 , which is 180 and 2.44 times larger than that of pure pristine g-C 3 N 4 and g-C 3 N 4 (Pt), respectively. The enhanced photocatalytic activity can be explained as the optimized 1T-WS 2 /g-C 3 N 4 sample has an increased light absorption (from visible to infrared region), better electrical conductivity and high density of active sites. The studies will be helpful for constructing high efficient heterostructured catalysts by loading 1T phase metal dichalcogenides 2D of material onto a two-dimensional material surface.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jingjing Zhen,Faguang Ma,Jing Yan,Rongxin Lin,Ming Yan,Yilin Wu
Complex substrates found in certain extracts-particularly those containing high phenolic compounds with significant medicinal value-pose considerable challenges to developing molecularly imprinted membranes (MIMs) with specific recognition abilities. In this study, UiO-66-NH 2 , a metal–organic structure (MOF), was chosen as an optimizer to enhance the basic support material C 3 N 4 . A composite imprinted membrane based on MOFs was then prepared for the targeted adsorption of luteolin (LTL). This not only increases the surface area and pore capacity of the composite membranes, but also ensures unprecedented control over the membranes structure and good stability. To maximize the proportion of imprinted sites, we utilize an advanced boron affinity sol–gel imprinting technique that capitalizes on the exceptional response of the bifunctional monomer. By finely manipulating the imprinting process, controlled distribution of imprinted sites was achieved. Furthermore, the incorporation of Ag nanoparticles into the composite matrix of MIMs enhances selectivity and efficiency due to their plasmonic properties and high affinity for phenolic compounds, providing increased adsorption surface area and additional binding sites. The results showed satisfactory rebinding ability (56.25 mg g −1 ) and superselective ( β AG/LTL = 4.43 and β CT/LTL = 8.49). It was worth noting that incorporating Ag nanoparticles into composite MIMs for the selective adsorption of LTL demonstrates significant potential. This includes enhanced selectivity, efficiency, and hydrophilicity of the membrane surface. Thus, enhanced hydrophilicity can establish stronger non-covalent interactions, namely hydrogen bonding and van der waals forces, with the target molecules, thereby significantly improving the adsorption capacity of the MIMs. The feasibility of this method was demonstrated via in-situ infrared analysis of the chemical structure changes before and after adsorption.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Yin Tang,Wen Cui,Songxia Wang,Fan Dong
Though photocatalytic purification of NO has been widely studied, how to avoid secondary pollution during gas-solid reaction is still a challenge, especially in inhibiting the formation of toxic intermediates (NO 2 ) and avoiding the blow away of powdery photocatalyst. Herein, we proposed a one-step solvothermal method to prepare melamine sponge (MS) supported and functionalized g-C 3 N 4 (CN), which simultaneously realizes the inhibition of NO 2 formation and catalyst loss. Sodium hydroxide , which plays a dual role, has been introduced during the preparation of supported photocatalyst. Specifically, sodium atom, as the modifier of performance, could facilitate the randomly distributed charge of pristine CN to be converged, which accelerates the adsorption/activation of reactants for efficient and deep NO oxidation . Hydroxyl group, as the binder between CN and MS, induces the interaction by forming hydrogen bonds , which contributes to the firm immobilization of powdery photocatalyst. The supported sample exhibits outstanding NO removal rate (58.90%) and extremely low NO 2 generation rate (1.41%), and the mass loss rate of photocatalyst before and after reaction is less than 1%. The promotion mechanism of performance also has been elaborated. This work takes environmental risks as a prerequisite to propose a feasible strategy for perfecting the practical application of photocatalytic technology .
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JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Gang Liu,Sheng Xu,Wenting Li,Zhenxi Wang,Meng Cao,Jinlong Cui,Xinde Jiang,Zhengqiu Li
In order to improve the visible light catalytic activity of TiO 2 , the TiO 2 @g-C 3 N 4 (TCN) composite catalysts with three-dimensional porous structure and rich active sites were prepared by hydrothermal method and calcination method orderly. The synthesized TCN composites microstructures were thoroughly characterized and their performance for the photocatalytic degradation of organic dyes was investigated. The results show that the prepared composites formed the heterojunctions with a core-shell structure, which can effectively broaden the absorption spectrum of TiO 2 to visible light region. In the degradation experiments, the TCN composites exhibited excellent photocatalytic degradation effect on organic dyes, which can reach 99.65% under visible light irradiation for 2 h. The strong acid condition was benefit to the catalytic process. After five cycles of testing, the degradation efficiency of organic dyes can still maintain at 95.62% level, which indicate that the TCN composites had excellent visible light catalytic activity and reusability.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 8
·1-13
·
IF 2.5
Zhu Jiantao,Wen He,Han Wei,Ma Jiantai,Zhang Feng,Liu Chaowei
The growing concern about the environmental consequences of anthropogenic CO 2 emissions significantly stimulated the research of low-cost, efficient, and recyclable solid adsorbents of CO 2 capture. Metal–organic frameworks (MOFs) are a promising porous material for CO 2 adsorption. Hybrid materials consisting in copper benzene-1,3,5-tricarboxylate (Cu-BTC) and Cu doped graphitic-carbon nitride (Cu-g-C 3 N 4 ) were prepared through solvothermal method as CO 2 adsorbent. The size range of Cu-BTC@1.8%Cu-g-C 3 N 4 was 9.0 ~ 19.4 μm, which was lower than the size range of Cu-BTC (14.6 ~ 29.6 μm). The hybrid adsorbents had lower Brunauer–Emmett–Teller (BET) surface areas and pole volume due to the combination with Cu-g-C 3 N 4 . The CO 2 adsorption capacity of Cu-BTC@1.8%Cu-g-C 3 N 4 increased by 49.5% compared with that of pure Cu-BTC because of more adsorption sites including unsaturated metal centers and N atoms. Moreover, the Cu-BTC@1.8%Cu-g-C 3 N 4 had good stability in CO 2 adsorption capacity after multiple adsorption cycles. Graphical abstract
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