Journal of Saudi Chemical Society
·
2021
·
IF 3.932
Tao Chen,Yuan Zhao,Ya-nan Sang,Min Tang,Guo-wen Hu,Xiao-bing Han,Jie Gao,Rui Ma
Efficient adsorption and separation of organic dyes in the wastewater is highly desirable for environmental protection. A facile synthesis of magnetic bio-based chitosan (CS) microspheres grafted with sodium polystyrene sulfonate (SPSS) via electron beam radiation is described. The obtained microspheres were characterized by FTIR, SEM, TG and VSM, which demonstrated millimetric magnetic CS-g-SPSS microspheres were obtained with enhanced thermal stability. Experimental parameters such as absorbed dosage, mass ratio, initial pH, initial concentration and contact time for the adsorption were thoroughly investigated. To investigate the adsorption rate and recyclability, evaluation of adsorption kinetic model and adsorption/desorption experiment were conducted.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
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IF 7.1
Qian Bi,Feng Qiu,Ruo Yuan,Yun Xiang
The abnormal variation of the concentration of acid phosphatase (ACP) in human body can be related to several pathophysiological diseases. Herein, a highly sensitive and non-label electrochemical biosensor for detecting ACP on the basis of target-induced inhibition of metal ion/pyrophosphate (PPi) coordination and G-quadruplex/hemin nanowires signal amplification is described. The target ACP molecules can hydrolyze PPi into phosphate to prevent the coordination between Cu 2+ and PPi, and the un-coordinated Cu 2+ further triggers cyclic cleavage of a G-quadruplex sequence (GS)-containing hairpin probes by the Cu 2+ -dependent DNAzyems on the sensor electrode to release the GS, which leads to in situ formation of the GS/hemin nanowires via the stacking of the free GS on the surface-immobilized GS with the presence of hemin . The many hemin molecules in the nanowires can thus yield dramatically enhanced current response for detecting ACP sensitively with the detection limit of 0.45 U/L. Besides, low levels of ACP present in diluted serum samples can also be selectively detected with this method. In addition to its sensitivity and selectivity, the developed method can realize substantial signal amplifications without using enzymes or nanomaterials, which can facilitate the establishment of convenient and sensitive strategies for detecting low concentrations of phosphatase for disease diagnosis.
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Yang Ding,Soumyajit Maitra,Chunhua Wang,Runtian Zheng,Meiyu Zhang,Tarek Barakat,Subhasis Roy,Jing Liu,Yu Li,Tawfique Hasan,Bao-Lian Su
Graphitic carbon nitride (g-C 3 N 4 ) has attracted great interest in photocatalysis and photoelectrocatalysis. However, their poor hydrophilicity poses a great challenge for their applications in aqueous environment . Here, we demonstrate synthesis of a hydrophilic bi-functional hierarchical architecture by the assembly of B-doped g-C 3 N 4 nanoplatelets . Such hierarchical B-doped g-C 3 N 4 material enables full utilization of their highly enhanced visible light absorption and photogenerated carrier separation in aqueous medium , leading to an excellent photocatalytic H 2 O 2 production rate of 4240.3 μM g −1 h −1 , 2.84, 2.64 and 2.13 times higher than that of the bulk g-C 3 N 4 , g-C 3 N 4 nanoplatelets and bulk B doped g-C 3 N 4 , respectively. Photoanodes based on these hierarchical architectures can generate an unprecedented photocurrent density of 1.72 mA cm −2 at 1.23 V under AM 1.5 G illumination for photoelectrochemical water splitting. This work makes a fundamental improvement towards large-scale exploitation of highly active, hydrophilic and stable metal-free g-C 3 N 4 photocatalysts for various practical applications.
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Materials Horizons
·
2025
·
IF 10.7
Yihao Duan,Haihua Wang,Guiqiang Fei,Yu Wang,Liyu Sun
Modification of graphitic carbon nitride (g-C3N4) with semiconductor nanomaterials has been widely investigated as an effective method to enhance its photocatalytic activity. However, the construction of efficient g-C3N4-based heterojunction photocatalysts via an environmentally benign method remains critical. Herein, a two-dimensional (2D) few-layered MoS2/S-doped g-C3N4 hierarchical heterojunction was successfully synthesized by a simple strategy via combining small molecule-assisted liquid exfoliation, calcination and hydrothermal strategy, which was subsequently utilized for photocatalytic formaldehyde removal. The evaluation of the photocatalytic degradation reaction showed that the as-prepared 2D/2D MoS2/S-doped g-C3N4 photocatalysts exhibited superior photocatalytic activity compared to pristine g-C3N4 and S-doped g-C3N4 alone, which was attributed to the intimate interface and rapid charge transfer pathways. This heterojunction structure suppresses the excited electron–hole pair recombination within g-C3N4, which optimally enhances the photodegradation activity owing to high electron–hole pair separation efficiency. The few-layer MoS2 nanosheets play an irreplaceable role due to their unique molybdenum–sulfur atomic arrangement, thereby displaying the superior electronic properties of few-layer or even monolayer nanosheets, which make them an important transfer medium for photoexcited electrons. Meanwhile, S doping effectively modulates the band gap of g-C3N4 and introduces sufficient structural defects to inhibit electron–hole recombination. Moreover, the synthesis employs efficient and non-hazardous reagents, and the resulting catalysts exhibit outstanding stability and recyclability for pollutant degradation.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Jiawei Xiao,Yongli Li,Jinshu Wang,Ting He,Junshu Wu,Panting Song,Youheng Yao
Photocatalysis is regarded as a promising strategy to address global energy and environmental challenges. Therein, S-scheme heterojunctions composed of complementary semiconductors can significantly enhance the utilization efficiency of photogenerated charge carriers while preserving the inherent strong redox capabilities of the semiconductors. However, the inadequate interfacial contact between the host and guest semiconductors hinders the enhancement of carrier separation efficiency. Herein, we developed a facile route to obtain uniform dispersion of WO 3 quantum dots (QDs) on g-C 3 N 4 . Specifically, the interfacial W-N bonding tightened the connection between WO 3 and g-C 3 N 4 , which serves as an efficient pathway for electron transfer, and significantly accelerates the directional migration of charge carriers following S-scheme. The optimized WO 3 QDs/g-C 3 N 4 S-scheme heterojunction exhibits a remarkable hydrogen evolution rate of 11,097.3 μmol·g⁻¹·h⁻¹ under simulate solar irradiation. Notably, the catalyst enables prominently overall water splitting without adding sacrificial agent, achieving simultaneous evolution of stoichiometric hydrogen and oxygen, 254.5 and 125.8 μmol·g⁻¹·h⁻¹, respectively, which are 5.2 times higher than those of WO 3 NPs/g-C 3 N 4 . Even without deposition of Pt as the co-catalyst, WO 3 QDs/g-C 3 N 4 displays noticeable gas production from water. This work will provide an idea for design and preparation of efficient photocatalyst.
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高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2025
·
IF 10.3
Weixia Wang,Yongji Zhang,Fei Zhao,Libo Wang,Fanpeng Meng,Shuchao Qin,Jinsheng Zhao
Carrier recombination in polymer photocatalysts involves both undissociated exciton decay and charge recombination, which are the main obstacles limiting their photocatalytic activity. Achieving efficient charge generation and separation in a polymer system is a fundamental strategy for the potential success of solar energy conversion to hydrogen, but it remains a huge challenge. In this study, we propose an innovative intermolecular π–π stacking strategy to construct a π-delocalized all-polymer S-scheme heterojunction for photocatalytic hydrogen evolution. Two conjugated porous polymers (CPPs)—PyB, composed of benzo[1,2-b:4,5-b′]dithiophene (BDT) and pyrene units, and PhB, composed of BDT and benzene—were synthesized and integrated with CN nanosheets. The highly planar and π-extended structure of PyB facilitated strong interfacial π–π stacking with CN, forming an extended π-delocalized network that enhanced the internal electric field (IEF), improved charge separation, and boosted visible-light absorption. As a result, the optimized PyB/CN-20 composite achieved a remarkable hydrogen evolution rate (HER) of 23.84 mmol⋅h −1 ⋅g −1 under visible light, approximately 287 times higher than that of pristine CN. This work underscores the critical role of polymer planarity and π-conjugation in heterojunction efficiency, and provides new insights into the rational design of π-delocalized S-scheme systems and establishes a general strategy for developing highly efficient, metal-free photocatalysts by leveraging molecular-level structural control.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mei Yang,Jingtian Yang,Ruobing Pi,Yunlong Zhou,Meng Sun,Jiang Liu
In the context of the “dual carbon” goals, the development of sustainable photocatalytic systems for carbon dioxide (CO 2 ) reduction is critical for alleviating energy scarcity while mitigating carbon emissions. Utilizing agricultural waste biomass in photocatalytic systems supports the recycling of biomass resources and mitigates the environmental issues caused by stalk burning. In this study, carbon quantum dots (CQDs) with nitrogen and phosphorus doping (NP-CQDs) were prepared by a hydrothermal approach using corn stalks as the carbon source. The NP-CQDs were then incorporated into a composite with graphitic carbon nitride (g-C 3 N 4 ) and nickel hydroxide (Ni(OH) 2 ), successfully obtaining the ternary catalyst of CN/Ni/NP-CQDs. The optimal ratio composite material of CN/Ni/NP-CQDs-4 demonstrates excellent CO 2 reduction performance, exhibiting the CO and CH 4 production rates of 14.24 and 0.73 μmol g −1 h −1 , which are 10.02 and 2.28 times that of pure g-C 3 N 4 . The CN/Ni/NP-CQDs-4 has a relatively large specific surface area, which can provide more active sites and improve the CO 2 reduction efficiency. EPR results show that the Z-scheme heterojunction formed by g-C 3 N 4 and Ni(OH) 2 can effectively suppress the recombination of photogenerated carriers. NP-CQDs serve as an electron mediator, thereby enhancing photogenerated charge transfer capability. This study successfully combines biomass corn stalk derivatives with traditional photocatalytic materials, thereby addressing the challenge of utilizing agricultural waste valorization while reducing the cost of the photocatalytic system. This study provides new insights for constructing a green and sustainable CO 2 reduction photocatalytic system.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Haochuan Jing,Ruipeng Ou,Hongbin Yu,Yahui Zhao,Ying Lu,Mingxin Huo,Hongliang Huo,Xianze Wang
The emergence of antibiotics in surrounding environment has aroused serious concerns. In this work, a direct Z-scheme heterojunction was constructed by integrating g-C 3 N 4 nanoparticles (g-C 3 N 4 NP) with WO 3 hollow microsphere composed of nanosheets (WO 3 NHMs) and developed as highly efficient photocatalyst for tetracycline hydrochloride (TC) removal. The hierarchical structure of WO 3 NHMs not only enhanced the optical absorption of catalyst by multiple reflecting and scattering of photons, but also promoted the adsorption of reactant molecules owing to the high surface area generated from the self-assembly interconnected nanosheets. The close contact between the interfaces of g-C 3 N 4 NP and WO 3 NHMs led to effective charge separation and transfer, and the optimized Z-scheme architecture preserved the oxidation and reduction capacity of each component to the greatest extent. After optimizing the component ratio, the corresponding g-C 3 N 4 NP/WO 3 NHMs hybrid delivered a significantly prominent photocatalysis towards TC degradation, whose kinetic constant was 2.42 times as high as that of bulk g-C 3 N 4 , and 6.88 folds as great as that of pristine WO 3 NHMs. As far as we know, this is the first report of integrating C 3 N 4 NP with WO 3 NHMs to enhance TC photodegradation through the synergistic effect of light absorption, quantum efficiency and adjusted surface characteristics. The active species capture experiments testified that h + and OH originated from the reaction of electrons with oxygen played important roles in the photocatalytic process. Under the attack of reactive oxygen species, TC underwent demethylation, deacylation, and ring-opening processes, and ultimately mineralized into CO 2 and H 2 O. This research can open up a new way to develop photocatalysts with high TC removal efficiency through reasonable structural configuration.
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JOURNAL OF CATALYSIS
·
2024
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IF 6.5
Mingyuan Guo,Yongning Ma,Zhanqing Liu,Donghua Wang,Yuhao Yang,Xiaolong Li,Enzhou Liu
Halogen doping is an effective approach to regulate the electronic structure and improve photocatalytic properties of g-C 3 N 4 . Here, a salt-assisted approach was employed to prepare layered porous halogen-doped g-C 3 N 4 . The effects of halogen electronegativity and pore morphology were discussed. Highly electronegative F-doped g-C 3 N 4 with smaller pore size and higher surface area displayed the enhanced absorption property on reactants. The H 2 production rate decreased and the RhB degradation significantly increased with increasing the electronegativity of layered porous g-C 3 N 4 , which was significantly different from the conventional halogen-doped g-C 3 N 4 prepared with halogenated acid and monolayer g-C 3 N 4 . The decreased H 2 evolution can be ascribed to the strong adsorption property, and the strong interactions between halide ions and H + were difficult to be disassociated. Additionally, the RhB degradation performance of halogen-doped g-C 3 N 4 significantly increased with increasing the electronegativity. The most active species that dominated the RhB degradation of F-doped g-C 3 N 4 are leaved holes (h + ), which are totally different from that of the pristine g-C 3 N 4 and Cl/Br-doped g-C 3 N 4 (superoxide radicals,·O 2 – ). This work helps us to well understand the role and importance of electronegativity and pore morphology on the H 2 generation and RhB degradation properties of layered porous g-C 3 N 4 .
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 6
·3389-3406
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IF 6.123
Lang Daning,Xu Xia,Wu Ronglan,Wang Wei,Shi Ming,Jia Ke,Chen Shifei,Wang Jide
A cellulosic material has been synthesized that could efficiently and selectively adsorb organic and inorganic contaminants from aqueous solutions without interference from competing adsorption sites. Cellulose-graft-tetraethylenepentamine molecular imprinted polymer (C-TEPA-MIP) was synthesized by using 4-nitrophenol (4-NP) as the template. The C-TEPA-MIP adsorbent could adsorb 4-NP and Cr(VI) simultaneously and selectively, without being affected by the competitive adsorption sites of each of these pollutants. The adsorption of 4-NP was predominantly due to the imprinted sites of 4-NP in C-TEPA-MIP that were located inside of the adsorbent, whereas that of Cr(VI) was primarily due to the amine groups of TEPA found on the surface of the adsorbent. Compared with the non-imprint polymer synthesized without the template, C-TEPA-MIP showed higher selectivity for both 4-NP and Cr(VI) in unitary and binary systems. In addition, C-TEPA-MIP exhibited good stability and recyclability for 4-NP, which makes it a promising candidate material for applications concerning wastewater treatment. Graphical abstract
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高影响因子
ACS Omega
·
2019
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IF 2.584
Chao Zhang,Jiandong Liu,Xiayun Huang,Daoyong Chen,Shiai Xu
Graphene-like g-C3N4 nanosheets (NSs) have been successfully synthesized with a modified polymerization process of melamine by cocondensation with volatile salts. Volatile ammonium salts such as urea–NH4Cl/(NH4)2SO4/(NH4)3PO4 were added with melamine to modulate the thermodynamic process during polymerization and optimize the structure formation in situ. The surface area, surface structure, and surface charge state of the obtained g-C3N4 NSs could be controlled by simply adjusting the mass ratio of the melamine/volatile ammonium salt. As a consequence, the g-C3N4 NSs exhibited much higher activity than bulk g-C3N4 for the photocatalytic degradation of target pollutants (rhodamine B, methylene blue, and methyl orange), and it also exhibited greater hydrogen evolution under visible light irradiation with an optimal melamine/volatile ammonium salt ratio. The as-prepared g-C3N4 NSs with melamine–urea–NH4Cl showed the highest visible light photocatalytic H2 production activity of 1853.8 μmol·h–1·g–1, which is 9.4 times higher than that of bulk g-C3N4 from melamine. The present study reveals that the synergistic effect of the enhanced surface area, surface structure, and surface charge state is the key for the enhancement of photocatalytic degradation and hydrogen evolution, which could be controlled by the proposed strategy. The result is a good explanation for the hypothesis that adding properly selected monomers can truly regulate the polymerization process of melamine, which is beneficial for obtaining g-C3N4 NSs without molecular self-assembly. Considering the inexpensive feedstocks used, a simple synthetic controlling method provides an opportunity for the rational design and synthesis, making it decidedly appealing for large-scale production of highly photocatalytic, visible-sensitizable, metal-free g-C3N4 photocatalysts.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
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IF 3.716
Ning Zhang,Chuanhui Huang,Ping Tong,Zunmei Feng,Xiaoping Wu,Lan Zhang
Volatile polycyclic aromatic hydrocarbons (PAHs) in water and soil are associated with status in the human body. Development of simple, efficient detection method is challenging due to the coating could be attacked by the abundance of water in the direct-immersion solid-phase microextraction. The stability of coating is essential to the analysis results. In this paper, a stable Ni-Zn MOF/g-C 3 N 4 (MG NFs) nanoflowers with cavity traps structure was firstly reported and acted as solid-phase microextraction (SPME) adsorbent for PAHs. Markedly enhanced moisture and acid stability of the MG NFs was obtained through the doping the hydrophobic graphitic carbon nitride (g-C 3 N 4 ) and metal ions into metal organic frameworks (MOFs). The aperture environment and ambient environment of MG NFs were changed by the doping of the Ni and the g-C 3 N 4, respectively. The moisture and acid stability of MG NFs were prominently increased under the dual protection. Compared to commonly used commercial coatings, the MG NFs own large surface area, unique nanoflowers structure and numerous open metal sites on the nanosheets, which demonstrated significant extraction superiority for PAHs. The MG NFs coated fiber was used for the SPME preconcentration of PAHs and couped with GC–MS for detecting PAHs. It presented low detection limits (0.1–3.0 ng L −1 ), wide linearity (0.3–5000.0 ng L −1 ) and good linearity (the correlation coefficient >0.9951). The inter-day and intra-day relative standard deviation (RSD) (n = 3) for three replicate extractions using one fiber was 3.8%–9.1%, and 3.5%–9.2%, respectively. The fiber-to-fiber reproducibility (n = 3) was 4.2–11.8%. The coupling method was successfully applied in the analysis of real water and soil samples with satisfactory recoveries of 82.9–109.2%, 84.2–106.4%, and the corresponding RSDs were 2.4–11.3%, 3.6–10.8%, respectively. The results indicated the effectiveness of NG NFs coated fiber in further practical application.
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