CHINESE JOURNAL OF CATALYSIS
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2017
·
IF 2.813
Xu Tang,Liang Ni,Juan Han,Yun Wang
abstract A stable PNIPAM/Fe 3 O 4 /g-C 3 N 4 composite photocatalyst was designed and prepared by a thermal photoinitiation technology. The structure and properties of the materials were characterized and the composite photocatalyst was found to show good stability for tetracycline degradation. The sample not only retained the magnetic properties of Fe 3 O 4 , allowing it to be recycled, but its photocatalytic properties could also be changed by controlling the temperature of the reaction system. The degradation intermediate products of tetracycline were further investigated by MS . This work provides a new facile strategy for the development of intelligent and recyclable photocatalytic materials.
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Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Yihao Zhao,Bingzhu Wang,Qimin Fang,Songyang Wu,Yuan Ma,Changxiang Xie,Haiwang Wang
To achieve efficient photocatalytic degradation of multi-component wastewater, the solvothermal method was employed to synthesize g-C 3 N 4 /BiOBr, leading to a homogeneous encapsulation of lamellar g-C 3 N 4 around the flower-like spherical BiOBr structure. In this work, the control of the temperature and the composition ratio during the solvothermal process was used to achieve the modulation of the g-C 3 N 4 /BiOBr microscopic morphology and enhance the photocatalytic activity, and the mechanism of the evolution of its microstructure and photocatalytic activity was elucidated. Moreover, the electron transport bridge between heterojunctions was constructed by introducing metal Pd, which further reduced the probability of photogenerated electron-hole complexation, leading to a higher photocatalytic performance. The elimination rates of RhB, Cr(VI), and TCH of g-C 3 N 4 /Pd/BiOBr under the irradiation of visible light were 99.74 %, 89.20 %, and 44.62 %, respectively, which achieved efficient elimination of a wide range of pollutants. Besides, the carrier transport mechanism in g-C 3 N 4 /Pd/BiOBr heterojunction was proven to Z scheme, which mainly induced the complexation of e - in the conduction band of BiOBr and h + in the valence band of g-C 3 N 4 , which provided higher energy for oxidation and reductive degradation. This work provides an important reference for the research focusing on photocatalyst design and sewage treatment.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Guodan Wang,Tengfei Huang,Yongsheng Tan,Shiyan Liu,Rong Wu,Zebo Fang,Baocheng Yang,Shunhang Wei
Photodeposition of noble metal nanoparticles is one of the effective strategies to enhance the photocatalytic activity of g-C3N4, but there are few reports about its application to improve the photocatalytic production of hydrogen peroxide (H2O2) by g-C3N4. In this work, different types and surface states of noble metal (Pt, Rh, Ru, Au, and Ag) nanoparticles were loaded on the surface of g-C3N4 through photodeposition. Based on their decomposition activity to H2O2, it was found that the weak adsorption between noble metals (such as metallic Ag, metallic Au, and negatively charged Au) and H2O2 was an important factor in inhibiting H2O2 decomposition. In addition, compared with metallic Au and metallic Ag, negatively charged Au was more conducive to O2 adsorption and activation. More importantly, besides the inhibition of carrier recombination benefiting from cocatalyst loading, the surface plasmon resonance effect of Au facilitated more electrons to participate in the reduction reaction. Thereby, the g-C3N4 loaded with negatively charged Au obtained the highest H2O2 concentration (16.98 μM in the first hour) in the absence of sacrificial agents through a two-step single-electron O2 reduction reaction pathway.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Wei Peng,Xiancai He,Xianlin Chen,Yishuo Zhang,Chunpei Yan,Zhongsheng Chen,Guolin Huang
The combination of adsorption and photocatalysis offers a synergistic strategy for enhanced U(VI) removal. In this study, g-C 3 N 4 /HAP composites were synthesized via a hydrothermal method to achieve efficient U(VI) removal. Hydroxyapatite (HAP) provides abundant adsorption sites for rapid U(VI) enrichment, while graphitic carbon nitride (g-C 3 N 4 ) exhibits excellent visible-light response, enabling the photocatalytic reduction of U(VI) to U(IV). The heterojunction formed between HAP and g-C 3 N 4 effectively suppresses electron-hole recombination, facilitating electron transfer and narrowing the band gap. Characterization revealed that the composite achieved a U(VI) removal efficiency of 99.28 % and a maximum adsorption capacity of 4880.95 mg/g, 1.85 times higher than single-component systems. Under solar light, photogenerated electrons in g-C 3 N 4 reduce U(VI) via interaction with dissolved oxygen to form superoxide radicals (· O 2 − ). This synergistic mechanism enhances photocatalytic performance and adsorption efficiency. The material exhibited excellent stability over multiple cycles, demonstrating its practical potential for environmental remediation. This study highlights the g-C 3 N 4 /HAP composite as a promising solar-driven material for efficient U(VI) removal, providing a sustainable and effective solution for uranium-contaminated water treatment.
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Catalysts
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2025
·Vol. 15
·期 2
·184
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IF 4
Xinpeng Mo,Hong Zhong,Chenhuan Hu,Haoxiong Jin,Xianfeng Liu,Huanhuan Liu,Genqiang Zhang
The photocatalytic CO2reduction (PCR) into value-added fuels offers a promising solution to energy shortages and the greenhouse effect, thanks to the mild conditions and environmental sustainability. However, the activation of CO2is challenging because of the thermodynamic stability and chemical inertness of CO2molecules, which significantly restricts the efficiency of PCR. Cobalt carbonate hexahydrate (CCH), known for its excellent CO2adsorption and activation properties, faces challenges like poor electron–hole separation and photoresponse. To address these issues, graphitic carbon nitride (CN) as a “pseudo-sensitizer” was introduced into the system by an in situ heterojunction synthesis strategy to produce CCH/CN photocatalyst, where Co–N bonds formed between CCH and CN enhance charge carrier migration and lower interfacial resistance. The CCH/CN catalyst achieved a CO production rate of 19.65 μmol g−1h−1, outperforming CCH, CN, and a mechanically mixed sample (Mix) by 7.74, 2.31, and 1.77 times, respectively. This work demonstrates an effective strategy for designing heterojunction catalysts to improve visible light utilization and charge transfer for efficient CO2reduction.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Qin Wang,Xue Bai,Shiyu Sun,Yan Li,Mingzhe Tan,Yanfeng Wang,Na Wang,Ting Wang,Lina Zhou,Zijian Zhou,Xin Huang,Hongxun Hao
The fluorine chemical industry's rapid growth demands efficient strategies for treating and utilizing the costly and inefficient byproduct, fluoride-containing hydrochloric acid, posing a significant challenge. In this study, a cost-effective method was developed for preparing an acid-resistant and efficient defluorination material. Carbon nitride (C 3 N 4 ) was chosen for its exceptional acid resistance and was modified via template-free doping with different zirconium source. Characterization results through XRD, FTIR, BET, XPS, SEM, and TEM confirm the successful synthesis of CN-Zr using zirconium chloride (ZrCl 4 ) with a specific surface area of 87.77 m 2 /g. Furthermore, the adsorption results indicate outstanding fluoride adsorption performance of CN-Zr in hydrochloric acid, with a maximum adsorption capacity of 145.34 mg/g and minimal zirconium leaching. Moreover, the adsorption mechanism was systematically studied using Zeta potential, FTIR and XPS characterization. The findings indicate that Zr was integrated with C 3 N 4 uniformly by forming a deep eutectic system (DES), utilizing exposed terminal amino groups for effective hydrogen bonding with HF which predominates as the primary fluorine existence in hydrochloric acid. Meanwhile, the enhanced ion exchange, complexation of Zr-F and strong electrostatic attraction all contribute to improving adsorption. Finally, the assessment of recyclability performance and operation cost demonstrate that the material can maintain 80% of its initial adsorption capacity after five cycles. The cost analysis results indicate that the adsorption cost is only 0.3157 CNY/g, making it considerable competitive in the industry.
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WATER RESEARCH
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2024
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IF 11.4
Xueli Hu,Zhi Zhang,Peng Lu,Yuanhang Zhou,Yingying Zhou,Yun Bai,Juanjuan Yao
Without light at night, the system for photocatalytic degradation of refractory organic pollutants in aquatic environments based on free radicals will fall into a dormant state. Hence, a round-the-clock photocatalyst (CCN@SMSED) was prepared by in situ growth of cyanide-deficient g-C 3 N 4 on the surface of Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ through a simple calcination method. The CCN@SMSED exhibits an outstanding oxidative degradation ability for refractory tetracycline (TC) in water under both light and dark conditions, which is attributed to the synergistic effect of free radical (•O 2 − and •OH) and non-radical (h + and 1 O 2 ). Electrochemical analyses further indicate that direct electron transfer (DET) is also one of the reasons for the efficient degradation of TC. Remarkably, the continuous working time of the round-the-clock photocatalyst in a dark environment was estimated for the first time (about 2.5 h in this system). The degradation pathways of TC mainly include demethylation, ring opening, deamination and dehydration, and the growth of Staphylococcus aureus shows that the process is biosafe. More importantly, CCN@SMSED holds significant promise for practical application due to its low energy consumption and suitability for removing TC from a variety of complex water bodies. This work provides an energy consumption reference for the practical application of round-the-clock photocatalytic degradation of organic pollutants.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
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IF 5.401
Junling Duan,Yuanhong Zhang,Yanbin Yin,Houshen Li,Jun Wang,Lusheng Zhu
A facile fluorescence “on-off-on” approach for sensing 6-Thioguanine (6-TG) and Hg 2+ was designed based on g-C 3 N 4 nanosheets. It was found that in the absence of Hg 2+ , the addition of 6-TG to g-C 3 N 4 nanosheets solution resulted in the fluorescence quenching of g-C 3 N 4 nanosheets (turn off). However, in the presence of Hg 2+ , the quenched fluorescence of g-C 3 N 4 nanosheets was recovered (turn on), because the high affinity of Hg 2+ and 6-TG resulted in the loss of molecular interactions between 6-TG and g-C 3 N 4 nanosheets. The quantitative detection of 6-TG was obtained via the fluorescence quenching of g-C 3 N 4 nanosheets with a detection limit of 65 nM. Meantime, the 6-TG-g-C 3 N 4 nanosheets system could be used as a fluorescent “turn on” sensor for Hg 2+ . The detection limit for Hg 2+ was 37 nM. The proposed method showed high selectivity for the detection of 6-TG and Hg 2+ . In addition, it was successfully applied to detect Hg 2+ in real water samples.
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WATER AIR AND SOIL POLLUTION
·
2017
·Vol. 228
·期 9
·1-11
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IF 1.702
Feng Weihua,Zhang Lanxin,Fang Jianzhang,Lu Shaoyou,Wu Shuxing,Chen Yi,Fang Zhanqiang
Graphitic carbon nitride (g-C 3 N 4 ) is a photocatalyst with wide application in removal of organic pollutants. In this study, we designed a porous g-C 3 N 4 (p-g-C 3 N 4 )/8-quinolinolato iron(III) (Q 3 Fe)/H 2 O 2 system to enhance the organic pollutant removal efficiency by combining photocatalysis and Fenton interaction under neutral condition. The p-g-C 3 N 4 was prepared through a two-step thermal oxidation reaction. Afterwards, Q 3 Fe-coupled p-g-C 3 N 4 was prepared by an impregnating method. The 2,4-dichlorophenol (2,4-DCP) photodegradation ratio and decomposition rate of the p-g-C 3 N 4 /Q 3 Fe/H 2 O 2 system are approximately 5 and 18 times as high as those of individual p-g-C 3 N 4 system, respectively. Besides, its degradation rate is 4.3 times as high as that in the p-g-C 3 N 4 /H 2 O 2 system. Meanwhile, Q 3 Fe/g-C 3 N 4 also exhibits higher activity than individual p-g-C 3 N 4 in 2,4-DCP photo-decomposing. On the basis of the results of the radical trapping experiments and the Fe(II) concentration in different systems, the synergistic effect between photocatalysis and Fenton reaction is vital for the efficient pollutant degradation. The coupled system combining p-g-C 3 N 4 with Q 3 Fe and H 2 O 2 shows potential for efficient treatment of recalcitrant organic pollutants. The combined system in this work indicated a new idea for the decomposition of organic pollutants.
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CHINESE JOURNAL OF CATALYSIS
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2024
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IF 15.7
Lingkun Yang,Zongjun Li,Xin Wang,Lingling Li,Zhe Chen
Photocatalysts featuring S-scheme heterojunctions offer considerable potential for both the photocatalytic CO 2 conversion and the degradation of antibiotics, providing practical solutions for energy crises and environmental challenges. In this work, 1D/2D CoTiO 3 /g-C 3 N 4 (CTO/CN) S-scheme heterojunction is synthesized through electrospinning and calcination . The close interweaving of g-C 3 N 4 nanosheets around CoTiO 3 nanofibers creates ample contact areas and active sites, resulting in exceptional photocatalytic CO production capability. The optimal mass ratio of CoTiO 3 to g-C 3 N 4 is 2%, and the CO and CH 4 yields are 46.5 and 0.825 μmol g -1 h -1 . Moreover, comparing with monomeric g-C 3 N 4 , this composite achieves a better CO yield with 43.5 times and displays an impressive product selectivity of 98.3% for CO 2 -CO photoreduction . In addition, the 2% CTO/CN photocatalyst demonstrates outstanding photocatalytic degradation efficiency, with degradation rates of 95.88%, 95.53%, and 71.23% for tetracycline hydrochloride , oxytetracycline , and ofloxacin , respectively. These enhanced photocatalytic properties are attributed to the S-scheme system constructed by CoTiO 3 with g-C 3 N 4 , maintaining strong oxidation-reduction capabilities while efficiently segregating photogenerated charges, with the existence of S-scheme heterojunction confirmed through various analyses. Furthermore, in situ studies and 13 C calibration experiments reveal that CO and CH 4 originate from the photocatalytic CO 2 conversion, further highlighting the potential of this work in advancing CO 2 photoreduction . This study offers novel insights into designing effective S-scheme heterojunction photocatalysts for practical applications to address environmental and energy challenges.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yana Xiao,Zihua Li,Bingang Xu
Flexible and stretchable triboelectric nanogenerators (TENGs) have been rapidly advanced owing to the demand for portable and wearable electronic devices that can work under universal or motional circumstances. While versatile materials can be applied in a TENG as dielectric materials, flexible and cost-effective electrodes are crucially important for the output performance of TENGs. Herein, we developed a poly(vinyl alcohol) (PVA) hydrogel TENG doped with a novel two-dimensional material, graphitic carbon nitride (g-C3N4), which could act as both a cost-effective flexible electrode and a positive dielectric for TENG with different morphologies. The measured peak-to-peak open-circuit voltage of the TENG reached 80 V at a dopant concentration of 2.7 wt % in single-electrode mode, which is far higher than that of the pristine PVA hydrogel TENG. As a demonstration of the application, the g-C3N4/PVA hydrogel TENG can be adopted as electronic skin to monitor the movement of the human body. Low-frequency mechanical energy-harvesting devices in different morphologies including discoid flake shape, tube shape, and spiral shape in the single-electrode mode or contact-separation mode have been designed, fabricated, and evaluated. All of these merits of the proposed hydrogel TENG after doping two-dimensional (2D) material g-C3N4 have demonstrated their promising potential for versatile applications in biomechanical energy harvesting and self-powered sensing.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Dong Li,Renyi Li,Yizhou Zhao,Kaixuan Wang,Ke Fan,Wei Guo,Qi Chen,Yujing Li
Perovskite CsPbBr 3 quantum dot shows great potential in artificial photosynthesis, attributed to its outstanding optoelectronic properties. Nevertheless, its photocatalytic activity is hindered by insufficient catalytic active sites and severe charge recombination. In this work, a CsPbBr 3 @Ag-C 3 N 4 ternary heterojunction photocatalyst is designed and synthesized for high-efficiency CO 2 reduction. The CsPbBr 3 quantum dots and Ag nanoparticles are chemically anchored on the surface of g-C 3 N 4 sheets, forming an electron transfer tunnel from CsPbBr 3 quantum dots to Ag nanoparticles via g-C 3 N 4 sheets. The resulting CsPbBr 3 @Ag-C 3 N 4 ternary photocatalyst, with spatial separation of photogenerated carriers, achieves a remarkable conversion rate of 19.49 μmol·g −1 ·h −1 with almost 100 % CO selectivity, a 3.13-fold enhancement in photocatalytic activity as compared to CsPbBr 3 quantum dots. Density functional theory calculations reveal the rapid CO 2 adsorption/activation and the decreased free energy (0.66 eV) of *COOH formation at the interface of Ag nanoparticles and g-C 3 N 4 in contrast to the g-C 3 N 4 , leading to the excellent photocatalytic activity, while the thermodynamically favored CO desorption contributes to the high CO selectivity. This work presents an innovative strategy of constructing perovskite-based photocatalyst by modulating catalyst structure and offers profound insights for efficient CO 2 conversion.
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