CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Hongwu Liao,Chong Wang,Jiaxian Zheng,Zhuo Chen,Yulin Zhou,Chengning Ye,Xiangfeng Lin,Meng An,Yusuke Yamauchi,Yusuke Asakura,Zhanhui Yuan
Photocatalytic depolymerization of lignin offers a sustainable approach to producing high-value-added aromatic compounds. Recently, carbon nitride has demonstrated notable selectivity for the C C bonds in lignin model compounds. However, limitations of pure carbon nitride include the low mobility of photogenerated electrons and the difficulty in precisely controlling the cleavage pathways and products of C C bonds. In this study, we constructed an S-Scheme heterojunction by in situ loading of Ce ions onto C 3 N 4 to form a CeO 2 /C 3 N 4 composite. This heterojunction achieves efficient lignin depolymerization under blue LED irradiation in an oxygen-rich environment. Comparative analysis indicated that the yield of primary products, benzaldehyde and phenyl formate, increased by 7.8-fold and 7.75-fold, respectively, compared with pure CeO 2 , and by 1.4 and 1.8 times relative to unmodified C 3 N 4 . After optimizing the reaction conditions, dealkalized lignin is applied to the system and successfully depolymerized. Comprehensive characterization and theoretical simulations verify the heterojunction's ability to enhance carrier separation and redox activity, with CeO 2 serving as an active dehydrogenation site that significantly boosts the depolymerization efficiency of lignin model compounds. This photocatalytic strategy presents a valuable step forward in lignin valorization and supports the sustainable utilization of biomass resources.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 9
·1931
·
IF 4.2
Yuhong Lin,Zhuoyuan Chen,Chang Feng,Li Ma,Jiangping Jing,Jian Hou,Likun Xu,Mingxian Sun,Dongchu Chen
In this study, S-doped graphitic carbon nitride (S-C3N4) was prepared using the high-temperature polymerization method, and then S-C3N4/AgCdS heterojunction photocatalyst was obtained using the chemical deposition method through loading Ag-doped CdS nanoparticles (AgCdS NPs) on the surface of S-C3N4. Experimental results show that the AgCdS NPs were evenly dispersed on the surface of S-C3N4, indicating that a good heterojunction structure was formed. Compared to S-C3N4, CdS, AgCdS and S-C3N4/CdS, the photocatalytic performance of S-C3N4/AgCdS has been significantly improved, and exhibits excellent photocatalytic degradation performance of Rhodamine B and methyl orange. The doping of Ag in collaboration with the construction of a Z-scheme heterojunction system promoted the effective separation and transport of the photogenerated carriers in S-C3N4/AgCdS, significantly accelerated its photocatalytic reaction process, and thus improved its photocatalytic performance.
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 35
·2103978
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IF 18.808
Wenchao Wang,Xueqin Bai,Qing Ci,Lili Du,Xingang Ren,David Lee Phillips
Undesired photoelectronic dormancy through active species decay is adverse to photoactivity enhancement. An insufficient extrinsic driving force leads to ultrafast deep charge trapping and photoactive species depopulation in carbon nitride (g-C 3 N 4 ). Excitation of shallow trapping in g-C 3 N 4 with long-lived excited states opens up the possibility of pursuing high-efficiency photocatalysis. Herein, a near-field-assisted model is constructed consisting of an In 2 O 3 -cube/g-C 3 N 4 heterojunction associated with ultrafast photodynamic coupling. This In 2 O 3 -cube-induced near-field assistance system provides catalytic “hot areas”, efficiently enhances the lifetimes of excited states and shallow trapping in g-C 3 N 4 and this favors an increased active species density. Optical simulations combined with time-resolved transient absorption spectroscopy shows there is a built-in charge transfer and the active species lifetimes are longer in the In 2 O 3 -cube/g-C 3 N 4 hybrid. Besides these properties, the estimated overpotential and interfacial kinetics of the In 2 O 3 -cube/g-C 3 N 4 hybrid co-promotes the liquid phase reaction and also helps in boosting the photocatalytic performance. The photocatalytic results exhibit a tremendous improvement (34-fold) for visible-light-driven hydrogen production. Near-field-assisted long-lived active species and the influences of trap states is a novel finding for enhancing (g-C 3 N 4 )-based photocatalytic performance.
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高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Shen Liyan,Xing Zipeng,Zou Jinlong,Li Zhenzi,Wu Xiaoyan,Zhang Yuchi,Zhu Qi,Yang Shilin,Zhou Wei
Black TiO 2 nanobelts/g-C 3 N 4 nanosheets laminated heterojunctions (b-TiO 2 /g-C 3 N 4 ) as visible-light-driven photocatalysts are fabricated through a simple hydrothermal-calcination process and an in - situ solid-state chemical reduction approach, followed by the mild thermal treatment (350 °C) in argon atmosphere. The prepared samples are evidently investigated by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N 2 adsorption, and UV-visible diffuse reflectance spectroscopy, respectively. The results show that special laminated heterojunctions are formed between black TiO 2 nanobelts and g-C 3 N 4 nanosheets, which favor the separation of photogenerated electron-hole pairs. Furthermore, the presence of Ti 3+ and g-C 3 N 4 greatly enhance the absorption of visible light. The resultant b-TiO 2 /g-C 3 N 4 materials exhibit higher photocatalytic activity than that of g-C 3 N 4 , TiO 2 , b-TiO 2 and TiO 2 /g-C 3 N 4 for degradation of methyl orange (95%) and hydrogen evolution (555.8 μmol h −1 g −1 ) under visible light irradiation. The apparent reaction rate constant (k) of b-TiO 2 /g-C 3 N 4 is ~9 times higher than that of pristine TiO 2 . Therefore, the high-efficient laminated heterojunction composites will have potential applications in fields of environment and energy.
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高影响因子
MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Junling Duan,Li Zhao,Wei Lv,YiJing Li,Yuanhong Zhang,Shiyun Ai,Lusheng Zhu
The g-C 3 N 4 /Fe 3 O 4 nanocomposites with good fluorescence and magnetic property were designed and prepared for simultaneous detection and separation of trace Cr(VI) in water. The g-C 3 N 4 /Fe 3 O 4 nanocomposites based fluorescent sensor for Cr(VI) showed high sensitivity and selectivity. The linear response range of Cr(VI) was found to be 0 to 600 μM with a detection limit of 0.5 μM. In addition, the g-C 3 N 4 /Fe 3 O 4 as a novel adsorbent had effective removal towards Cr(VI). The adsorption capacity could reach 59.2 mg/ g. Furthermore, the g-C 3 N 4 /Fe 3 O 4 nanocomposites displayed superparamagnetic properties, allowing them to be easily separated from the liquid phase via an external magnetic field .
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高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Zhiyong Mao,Jingjing Chen,Yanfang Yang,Dajian Wang,Lijian Bie,Bradley D. Fahlman
Novel g-C3N4/CoO nanocomposite application for photocatalytic H2 evolution were designed and fabricated for the first time in this work. The structure and morphology of g-C3N4/CoO were investigated by a wide range of characterization methods. The obtained g-C3N4/CoO composites exhibited more-efficient utilization of solar energy than pure g-C3N4 did, resulting in higher photocatalytic activity for H2 evolution. The optimum photoactivity in H2 evolution under visible-light irradiation for g-C3N4/CoO composites with a CoO mass content of 0.5 wt % (651.3 μmol h–1 g–1) was up to 3 times as high as that of pure g-C3N4 (220.16 μmol h–1 g–1). The remarkably increased photocatalytic performance of g-C3N4/CoO composites was mainly attributed to the synergistic effect of the junction or interface formed between g-C3N4 and CoO.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Yanxian Geng,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Heterojunctions have attracted considerable attention for efficiently utilizing solar energy and improving conversion efficiency during pollutant degradation. Herein, carbon nitride and hematite (α-Fe 2 O 3 ) are used to prepare a Z-scheme 2D/2D α-Fe 2 O 3 /g-C 3 N 4 heterojunction using an impregnation-hydrothermal method. The unique 2D/2D structure has a high interfacial area and widely-dispersed active sites. The energy band structure of the Z-scheme heterojunction leads to broad visible-light absorption and promotes charge transfer. Optimizing the content of the α-Fe 2 O 3 precursor in composite leads to a maximum efficiency of 60.8% for the removal of 600 ppb of NO , which is approximately 1.78 times that of g-C 3 N 4 (34.2%). The photocatalytic performance is greatly promoted because of the formation of the heterojunction and the strong interfacial action between g-C 3 N 4 nanosheets and α-Fe 2 O 3 nanoplates. Cycling experiments verify that the α-Fe 2 O 3 /g-C 3 N 4 heterojunction has good stability and reusability. The α-Fe 2 O 3 /g-C 3 N 4 heterojunction therefore has great potential in sustainable and efficient pollutant degradation.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Ya-Nan Li,Zhao-Yang Chen,Min-Qiang Wang,Long-zhen Zhang,Shu-Juan Bao
A porous g-C 3 N 4 /TiO 2 with hierarchical heterostructure has been successfully fabricated through a in situ assembling of small needle-like TiO 2 on the surface of ultrathin g-C 3 N 4 sheets. The ultrathin g-C 3 N 4 sheets with carbon vacancies and rich hydroxyl groups were found to facilitate the nucleation and in situ growth of TiO 2 and also to modulate the surface chemical activity of the g-C 3 N 4 /TiO 2 hierarchical heterostructure. The as-designed photocatalytic heterojunction degraded Acid Orange with 82% efficiency after 10 min under simulated solar light, and possessed excellent cycle stability. Relative physical characterizations and photochemical experiments reveal that engineering the interface/surface of g-C 3 N 4 plays a vital role in effectively constructing heterostructures of g-C 3 N 4 /TiO 2 , thus realizing efficient photoinduced electron-hole separation during photocatalytic process.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Dongfeng Sun,Yu Kang,Junwei Wang,Luo Huang,ShuKai Ding,Guohui Dong,Yanning Qu,Yuan Yu
Ammonia synthesis via photocatalytic nitrogen fixation is regarded as a green and sustainable alternative to the conventional Haber-Bosch process. Nevertheless, its practical application is greatly hindered by the chemically inert N N triple bonds and slow reaction kinetics. In this work, a Cu-doped TiO 2 /g-C 3 N 4 composite with a well-defined type-II heterojunction was synthesized through a facile wet-chemical method integrating low-temperature crystallization and in-situ molecular assembly. Characterizations confirm that Cu-TiO 2 nanoparticles are evenly immobilized on g-C 3 N 4 nanosheets, which effectively suppresses nanoparticle aggregation. On the one hand, Cu doping tunes the band structure of TiO 2 and introduces abundant oxygen vacancies, greatly promoting the adsorption and activation of N 2 molecules. On the other hand, the formed type-II heterojunction establishes an internal electric field, which broadens light response and accelerates the separation and migration of photogenerated charge carriers. Benefiting from the synergistic effect of Cu doping, oxygen vacancies and type-II heterojunction, the optimal Cu-TiO 2 /g-C 3 N 4 (CuTCN-2) achieves an outstanding NH 3 evolution rate of 91.14 μmol·g −1 ·h −1 with a quantum yield of 1.75% at 420 nm under simulated solar illumination. The activity is 7.6-, 3.4- and 34.1-fold higher than that of bare TiO 2 , single Cu-TiO 2 and pristine g-C 3 N 4 , respectively. This work reveals that the co-regulation of heteroatom doping, defect engineering and heterojunction construction can remarkably boost photocatalytic kinetics. It also provides a feasible design principle for high-performance photocatalysts toward solar-driven nitrogen fixation.
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高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2026
·
IF 2.9
Wang Guoqiang,Yu Qingbo,Feng Xiujuan
Using titanium ester Tyzor 371 and dicyandiamide as raw materials, modified precursors DCDA-x were synthesized by hydrothermal method with controlled titanium ester ratios, followed by calcination to prepare TiO 2 -composited C-doped g-C 3 N 4 catalysts TCCN-x. The study shows that hydroxyl groups of the titanium ester form hydrogen bonds with amino groups of dicyandiamide, and their combined steric hindrance suppresses the polymerization of g-C 3 N 4 . Among them, the TCCN-3 precursor exhibits the strongest hydrogen bonding and the most significant inhibition effect. During calcination, the titanium ester decomposes to produce amorphous carbon that integrates into the heptazine rings or interlayers of g-C 3 N 4 , facilitating charge transfer. Simultaneously, the formed TiO 2 creates heterojunctions with g-C 3 N 4 , enhancing carrier separation. Together, these effects synergistically improve the photocatalytic performance. After 60 min of visible-light irradiation, TCCN-3 achieves a methylene blue degradation rate of 53.02%, which is 2.24 times that of pure g-C 3 N 4 (23.60%), exhibiting the best performance. Graphical abstract
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高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 5.2
Xuemei Bai,Ketian Gao,Haijun Miao,Song Hu,Xueya Liu,Mouji Li,Bo Yu,Zhengfeng Ma,Feng Zhou,Wufang Yang
Controllable growth of hydrogel coatings on diverse substrates is highly desirable yet remains challenging due to the lack of universal and straightforward fabrication strategies. Herein, we present a visible-light-activated, surface-catalyzed radical polymerization approach that enables the controllable in situ construction of hydrogel coatings on a broad spectrum of materials. The process initiates with the deposition of a P(DMA-co-MEA)@g-C3N4 adhesive primer layer, which not only establishes robust interfacial anchoring to the substrate but also functions as a photocatalytic initiator under visible-light irradiation. This interfacial activation drives spatially confined polymerization, yielding uniform hydrogel coatings with precisely tunable thickness. The method demonstrates extensive substrate compatibility─including metals, polymers, and inorganic materials─and readily affords programmable surface functionalities through interfacial chemical design to impart antifouling, lubricating, or biocompatible properties. Owing to its universality, strong interfacial adhesion, and operational simplicity, this strategy provides a versatile platform for the functional tailoring of irregular and three-dimensional surfaces and holds substantial potential for applications in surface/interface engineering and biorelated technologies.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Shuanglian Jia,Wenfeng Li,Che Qian,Guofang Du,Zetian He,Yu Liang
Construction of ultrathin CoAl-LDHs/g-C 3 N 4 Type-II heterojunction via an electrostatic self-assembly. • Type-II band alignment suppresses charge recombination and boosts charge separation. • Bifunctional design enables efficient H 2 evolution and pollutant degradation. • In-situ XPS and DFT calculations validate the proposed charge transfer pathway. Constructing efficient and stable heterojunction photocatalysts was crucial for achieving bifunctional applications in antibiotic degradation and photocatalytic hydrogen production. Herein, an ultrathin CoAl-LDHs/g-C 3 N 4 Type-II heterojunction was successfully fabricated via an electrostatic self-assembly strategy, and its performance was systematically evaluated for both ciprofloxacin (CIP) degradation and visible-light-driven hydrogen evolution reaction (HER). The optimal CAC2 sample (CAC2, mass ratio of 1:2) achieved a CIP degradation efficiency of 84.9%, which was 1.9-fold and 3.3-fold higher than those of pristine CoAl-LDHs (CAL) and g-C 3 N 4 (CN), respectively. Meanwhile, it delivered a remarkable hydrogen evolution rate of 1935.67 μmol·g −1 ·h −1 , which was 263.3 and 6.5 times higher than those of pristine CAL and CN, respectively. The significantly improved hydrophilicity of the heterojunction enhanced the interfacial enrichment of CIP. Active species trapping experiments confirmed that h + acted as the dominant reactive species, while ·O 2 - played an auxiliary role. Combining XPS, work function calculations, and in situ XPS under light irradiation, we strongly indicate that electrons spontaneously transfer from CAL to CN in the dark, establishing a built-in electric field (BIEF) oriented from CAL to CN. Upon light excitation, the photogenerated electrons migrate from CN to CAL following the typical Type-II pathway, which together with the BIEF synergistically facilitates spatial charge carrier separation. This study elucidated the structure-activity relationship of the electrostatic self-assembled Type-II heterojunction for bifunctional photocatalysis, offering a new paradigm for designing efficient and robust catalytic materials for environmental and energy applications. Download: Download high-res image (253KB) Download: Download full-size image
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