ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Bo Hu,Fanpeng Cai,Tianjun Chen,Mingshan Fan,Chengjie Song,Xu Yan,Weidong Shi
We synthesized g-C3N4/nano-InVO4 heterojunction-type photocatalyts by in situ growth of InVO4 nanoparticles onto the surface of g-C3N4 sheets via a hydrothermal process. The results of SEM and TEM showed that the obtained InVO4 nanoparticles 20 nm in size dispersed uniformly on the surface of g-C3N4 sheets, which revealed that g-C3N4 sheets was probably a promising support for in situ growth of nanosize materials. The achieved intimate interface promoted the charge transfer and inhibited the recombination rate of photogenerated electron–hole pairs, which significantly improved the photocatalytic activity. A possible growth process of g-C3N4/nano-InVO4 nanocomposites was proposed based on different mass fraction of g-C3N4 content. The obtained g-C3N4/nano-InVO4 nanocomposites could achieve effective separation of charge-hole pairs and stronger reducing power, which caused enhanced H2 evolution from water-splitting compared with bare g-C3N4 sheets and g-C3N4/micro-InVO4 composites, respectively. As a result, the g-C3N4/nano-InVO4 nanocomposite with a mass ratio of 80:20 possessed the maximum photocatalytic activity for hydrogen production under visible-light irradiation.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2019
·
IF 2.752
Yibing Feng,Yi Du,Minxing Du,Xiuying Tian,Nan Jiang,Yang Liu
The g-C 3 N 4 /BiOCl x Br 1-x heterojunctions photocatalysts with different band gaps were successfully synthesized via a simple precipitation process. The photocatalytic activitys of the g-C 3 N 4 /BiOCl x Br 1-x composites were evaluated through the degradation of Tetracycline Hydrochloride (TC) under visible light irradiation. Compared with pure g-C 3 N 4 and BiOCl x Br 1-x , the hybrids exhibited prominently enhanced visible light photocatalytic activity for the degradation of TC. The various photocatalytic perfprmances of g-C 3 N 4 /BiCl x Br 1-x heterojunctions with same content of g-C 3 N 4 were determined by different optical absorption capabilities resulting from the band structures , which could be controlling by changing the molar ratio of Br to Cl in BiOCl x Br 1-x . The 10-CN/BiOCl 0·5 Br 0.5 (g-C 3 N 4 content: 10%) showed the highest photocatalytic activity toward TC, due to the optimal synergistic effect of bandgap structure and effective separation of electron-hole pairs. Furthermore, the capture experiments of 10-CN/BiOCl 0·5 Br 0.5 during photocatalytic reaction were also carried out, the results indicted the holes (h + ) and superoxide radicals (-O 2 - ) were the main active substances causing the enhancement of photocatalytic activity. Finally, we proposed a reasonable photocatalytic degradation of this g-C 3 N 4 /BiOCl x Br 1-x heterojunction photocatalysts .
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CHEMISTRY-A EUROPEAN JOURNAL
·
2015
·Vol. 21
·期 28
·10149-10159
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IF 5.731
Fa-tang Li,Shao-jia Liu,Ya-bin Xue,Xiao-jing Wang,Ying-juan Hao,Jun Zhao,Rui-hong Liu,Dishun Zhao
Heterojunctions of g-C 3 N 4 /Al 2 O 3 (g-C 3 N 4 =graphitic carbon nitride) are constructed by an in situ one-pot hydrothermal route based on the development of photoactive γ-Al 2 O 3 semiconductor with a mesoporous structure and a high surface area (188 m 2 g −1 ) acting as electron acceptor. A structure modification function of g-C 3 N 4 for Al 2 O 3 in the hydrothermal process is found, which can be attributed to the coordination between unoccupied orbitals of the Al ions and lone-pair electrons of the N atoms. The as-synthesized heterojunctions exhibit much higher photocatalytic activity than pure g-C 3 N 4 . The hydrogen generation rate and the reaction rate constant for the degradation of methyl orange over 50 % g-C 3 N 4 /Al 2 O 3 under visible-light irradiation ( λ >420 nm) are 2.5 and 7.3 times, respectively, higher than those over pristine g-C 3 N 4 . The enhanced activity of the heterojunctions is attributed to their large specific surface areas, their close contact, and the high interfacial areas between the components as well as their excellent adsorption performance, and efficient charge transfer ability. Graphical Better together : A structure modification function of g-C 3 N 4 (graphitic carbon nitride) for Al 2 O 3 in the hydrothermal preparation process is found and highly efficient g-C 3 N 4 /Al 2 O 3 heterojunctions are constructed by an in situ route, which results in large specific surface areas, close contacts and high interfacial areas between the components. The defect sites of Al 2 O 3 act as acceptors of photo-induced electrons from g-C 3 N 4 (see figure), which contributes to an enhanced photocatalytic activity of g-C 3 N 4 .
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MATERIALS RESEARCH BULLETIN
·
2024
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IF 5.3
Ruxue Ma,Han Zheng,Jing Wang,Xiucheng Zheng,Xiaoli Zhang,Xinxin Guan
Photocatalytic degradation is an effective and challenging strategy in purifying wastewaters containing organic pollutants. Thus, developing a suitable photocatalyst and clarifying the degradation mechanism are extremely worthwhile. In this work, Zn 2+ -decorated porous g-C 3 N 4 with nitrogen vacancies (g-C 3 N 4-δ ) is prepared with the facile sonication-calcination method. Benefitting from the modified geometric structure and electronic properties, compared with g-C 3 N 4-δ , the resulting composites deliver reduced micropore percentage, enhanced separation and migration of photogenerated carriers, narrowed band gap, and improved reducing capacity of photoinduced electrons, favoring the photocatalytic reaction. Particularly, Zn 2+ (2)-g-C 3 N 4-δ (10 mg) displays the highest photocatalytic activity toward eliminating tetracycline (TC, 10 mg L -1 , 50 mL), and the degradation efficiency (63.9%) within 30 min is 3.4 times that of g-C 3 N 4-δ (18.9%) irradiated by visible light. Moreover, the optimal composite demonstrates satisfactory recyclability and excellent universality. This study suggests a novel way to construct g-C 3 N 4 -based photocatalysts for efficiently degrading organic contaminants in water.
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CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Lihong Tan,Xinhe Wu,Jiachao Xu,Mahmoud Sayed,Guohong Wang
The construction of crystalline/amorphous g-C 3 N 4 homojunctions presents a versatile strategy to obtain all-organic homojunction photocatalysts with better interface matching and lower interface charge carrier movement resistance for optimized photocatalytic activity. However, the process entails a complex multi-step workup, which compromises its feasibility. To overcome this challenge, this work provided an innovative Na 2 CO 3 -induced crystallinity modulation strategy to construct a Na-doped crystalline/amorphous g-C 3 N 4 S-scheme homojunction photocatalyst in a single step. The approach involves the initial pre-assembling of melamine and cyanuric acid molecules, and subsequent introduction of Na 2 CO 3 before the calcination. Na 2 CO 3 plays key roles to induce in-situ crystallinity modulation during the calcination and as a source for Na-doping. The prepared g-C 3 N 4 S-scheme homojunction photocatalyst demonstrated a prominent H 2 O 2 -production rate of 444.6 μmol·L –1 ·h –1 , which is 6.1-fold higher than that of bulk g-C 3 N 4 . The enhanced activity was attributed to the synergistic effect of charge carrier separation induced by the S-scheme homojunction system, and the optimized interfacial H 2 O 2 generation kinetics. The latter was fostered by the Na-doping. This study provides an innovative approach for the one-step construction of g-C 3 N 4 S-scheme homojunction and its integration in photocatalytic applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Jinhui Huang,Jianglin Hu,Yahui Shi,Guangming Zeng,Wenjian Cheng,Hanbo Yu,Yanling Gu,Lixiu Shi,Kaixin Yi
Recently, the application of membranes faces a big challenge due to membrane fouling, to alleviate this situation, the hybridization of photocatalysis and membrane filtration has aroused significant attention. In this study, we firstly introduced melamine, cyanuric acid and urea in dimethyl sulfoxide (DMSO) as precursors to fabricated the MCU(DMSO)-C 3 N 4 material with excellent photocatalytic performance, and immobilized it on PVDF membranes by vacuum filtration, subsequently adding polyethylene glycol and glutaraldehyde as crosslinkers from MCU-C 3 N 4 /PVDF membrane. The results demonstrate that with the MCU-C 3 N 4 ratio increasing, the membrane flux was gradually decreased. Besides, the photocatalytic efficiencies of MCU-C 3 N 4 /PVDF for rhodamine B (RhB) and tetracycline hydrochloride (TC) degradation are 84.24% and 71.26% respectively, which are about 8 times higher than that of the original membrane. To evaluate antifouling performance of photocatalytic membranes, we conducted a four-stage filtration system, and the flux recovery ratio (FRR) of MCU-C 3 N 4 /PVDF membranes reached over 80% (optimum 91%) under visible light irradiating (λ > 420 nm) for 30 min. Meanwhile, under visible light irradiation reversible fouling (Rr) gradually became the dominant fouling factor instead of the irreversible fouling (Rir), indicating the excellent antifouling performance of MCU-C 3 N 4 /PVDF membranes. This novel method to modify membranes with MCU-C 3 N 4 gives insight to photocatalytic and self-cleaning properties of photocatalytic composite membranes, providing theoretical basis for their broad application.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Yaolin Hou,Jolla Kullgren,Lei Han,Pengyuan Qian,Wei Yuan,Jia Liu,Haiming Xie,Jiefang Zhu
Lithium-sulfur (Li-S) batteries, renowned for their exceptional theoretical energy density, are positioned as a leading candidate for future energy storage systems, offering a potential pathway to overcome the energy density limitations of conventional lithium-ion batteries. Nevertheless, the notorious lithium polysulfides (LiPSs) shuttle effect and sluggish redox kinetics hinder their practical application. To resolve these challenges, we report a novel NiO-Ni 2 P/C 3 N 4 heterostructure synthesized via an in-situ phosphation process. Herein, we present an in situ phosphorylation strategy for the construction of NiO-Ni 2 P heterojunctions anchored on a conductive C 3 N 4 substrate (NiO-Ni 2 P/C 3 N 4 ) for further integration into commercial polypropylene (PP) separator (denoted as NiO-Ni 2 P/C 3 N 4 @PP). Mechanistic studies demonstrated that the NiO phase facilitated strong chemisorption of LiPSs, while the Ni 2 P component reduced the energy barrier for Li 2 S dissolution through optimised d-band electron transfer. Concurrently, the C 3 N 4 framework enhanced the interfacial charge transfer and significantly reduced the charge transfer resistance. Benefiting from the synergistic “adsorption-transformation-conduction” triple-function, the cells with the NiO-Ni 2 P/C 3 N 4 @PP separator exhibit remarkable cycling stability (over 300 cycles at 3C) and outstanding rate capability (82.5 % capacity retention after 200 cycles at 5C). This work provides atomic-level insights into the engineering of multi-step sulfur electrochemical heterostructures, providing a generic design paradigm for high-energy metal-sulfur batteries.
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ACS Applied Materials & Interfaces
·
2025
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IF 8.2
Shenao Wang,Yuan Yang,Yongtao Zhao,Jianwei Qiu,Xiaochen Wu,Zhaojun Liu,Fei Ding,Pengchao Si
Electrochemical reduction of CO2 (ECO2RR) to formate represents a promising approach to achieving carbon neutrality, yet it faces significant challenges due to the low adsorption efficiency of the CO2 intermediates. In this study, we developed a highly dispersed electron-rich Bi metal catalyst, utilizing low-cost g-C3N4 as a nonmetallic support and electron donor. This design created a conductive network and a multielectron environment around the Bi atoms that facilitated dynamic interfacial charge transfer from g-C3N4 to Bi, thus enhancing the catalytic efficiency of active sites. The assembly catalyst exhibited a formate selectivity of over 90% within a wide potential window and maintained stable catalytic activity in simulated seawater solutions. In situ Raman spectroscopy and DFT calculations indicated that the incorporation of the nonmetallic support shifted the Bi-p band center to more negative values while increasing Bader charge transfer between Bi and *OCHO intermediates. This indicated enhanced adsorption of the *OCHO intermediate by electron-rich Bi, thus improving the selectivity and activity for formate production.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Song Han,Yun Zhao,Mina Liang,Jinshui Su,Xiangxiong Zhai,Qi Zhang,Guoling Li,Zhonghai Ni
The photocatalytic cleavage of C α -C β bonds in lignin holds considerable potential for the production of value-added chemicals. Lignin consists of phenylpropane units interconnected by a variety of complex chemical bonds. Specifically, C-O bonds are more prevalent and relatively easier to cleave, whereas C–C bonds exhibit higher bond energy, rendering them more difficult to cleavage under conventional conditions. This study presents a phosphotungstic acid/phosphoric acid-functionalized porous tubular C 3 N 4 composite photocatalyst (PW/P-TCN). H 3 PO 4 modified PW/P-TCN surfaces enhance O 2 adsorption, improve separation and transfer of photogenerated carriers, and increase exposure of active sites. This promotes reactant adsorption and significantly boosts photocatalytic efficiency. Through this strategy, 1,2-diphenylethanol (DPol), used as a typical model substrate, is fully converted into aromatic monomers, achieving a DPol conversion rate of 99.9 %. Mechanistic studies reveal that C α -C β bond cleavage primarily involves the photo-oxidation mechanism mediated by electron-hole coupling. The construction of the PW/P-TCN heterojunction is essential for simultaneously sustaining robust reduction and oxidation capabilities. Natural lignin samples are applied to the photocatalytic system, and successful C–C bond cleavage depolymerization is achieved under optimal reaction conditions. This study offers valuable insights for the design of more economical and efficient photocatalysts for lignin depolymerization.
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RSC Advances
·
2016
·Vol. 6
·期 99
·96861-96869
·
IF 3.289
Lei Shi,Jinling Gou,Lin Liang,Fangxiao Wang,Jianmin Sun
A g-C3N4/Ag2WO4 composite photocatalyst was synthesized via a simple co-precipitation method at room temperature and was thoroughly characterized by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, UV-visible diffuse reflectance spectroscopy and photoluminescence spectroscopy. The characterization results indicated that upon depositing Ag2WO4 onto the surface of g-C3N4 its morphology changed from primary rod-like particles to globular nanoparticles and its phase changed from α-type to β-type Ag2WO4. When the composite was used as the catalyst in the photodegradation of Rhodamine B, 40%-g-C3N4/Ag2WO4 exhibited the highest photocatalytic activity with its rate constant was about 10.8 times larger than that of pure g-C3N4 and 3.12 times larger than that of bare Ag2WO4. The enhanced photocatalytic activity can be attributed to the complementary potentials of the conduction bands and valence bands of g-C3N4 and Ag2WO4, which could not only realize the effective separation of photoinduced electron and hole pairs, but also retained the catalysts high stability and photocatalytic performance even after five recycles. Furthermore, a possible photocatalytic mechanism for the degradation of RhB over the g-C3N4/Ag2WO4 composite was proposed according to the results of active species quenching experiments.
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DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Shen Shen,Jia Jia Fu,Hong Bo Wang
Exploring desirable and photostable homostructured catalysts is an explosive scientific hotspot for energy crisis and wastewater treatment . Efficient pollutants removal from wastewater is an attractive route to sustainable development. We here present an ideal photocatalyst that incorporates both g-C 3 N 4 and TiO 2 sheets (TNs), creating a novel nanomaterial of the type g-C 3 N 4 /TNs catalyst. The obtained photocatalyst can accelerate the interfacial charge transfer rate. Subsequently, we prepared 2:1O − -g-C 3 N 4 /TNs photocatalysts by H 2 treatment, which not only generated more active defects on 2:1O − -g-C 3 N 4 /TNs surface, but also produced oxygen vacancies . As measured by the degradation of CR (CR), the as-prepared g-C 3 N 4 /TNs samples perform outstanding removal properties due to high photocurrent response under visible light irradiation, which are transcend than bulk g-C 3 N 4 or pure TNs separately. Specially, the obtained 2:1O − -g-C 3 N 4 /TNs catalysts exhibit the highest photocatalytic rate for decomposition of CR (86.7%, 2 h), which was 107.5, 7.167, and 1.43 times higher than that of TNs, g-C 3 N 4 , and 2:1 g-C 3 N 4 /TNs. The decisive factor in enhancing the photocatalytic ability of this optimal sample is the richly available reaction sites exposed by hydrogenation process .
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Lei Lei,Deyu Wang,Yongfu Kang,Yoann de Rancourt de Mimérand,Xiaoyun Jin,Jia Guo
The combination of a phosphor with semiconductor photocatalysts can provide photoactivity in the dark. Indeed, the phosphor acts as a “light battery”, harvesting photons during irradiation and later re-emitting light that can be used by the catalytic phase when in conditions of total darkness. This allows for continued activity of the composite catalyst, even in conditions of unstable light stimulation. In this study, we assess the use of a heterojunction, namely graphitic-C3N4/Ag3PO4, that enables efficient photoactivity specifically under visible light stimulation, in combination with a phosphor that exhibits green–blue phosphorescence (510 nm), that is SrAl2O4:Eu2+,Dy3+. Our findings showed that this combination was particularly interesting, noticeably displaying significant photoactivity in darkness, after short periods of activation by visible light. After finding the right combination and optimal ratios for maximum efficiency, the resulting catalyst composite was immobilized on resin supports with a fractal surface, printed by LCD-SLA 3D printing. The immobilization was effectuated via an aqueous-phase plasma-aided grafting (APPAG) process, using cold plasma discharge (CPD) and using vinylphosphonic acid (VPA) as a coupling agent. Whereas the colloidal photocatalyst displayed a serious problem of partial physical separation between the catalytic phase, g-C3N4/Ag3PO4, and the phosphor, the immobilization of the composite catalyst on polymer supports allowed solving this issue. Photodegradation assessments confirmed that the hybrid supported phosphor-enhanced catalyst was active, notably in dark conditions, as well as fairly photostable. This study offers new prospects for the fabrication of polymer-based panels for water purification, with round-the-clock activity and that are, in addition, extremely easy to recover and reuse, by comparison with colloidal catalysts.
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