DALTON TRANSACTIONS
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2023
·Vol. 52
·期 22
·7447-7456
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IF 4
Qian Chen,Jianfeng Huang,Ting Xiao,Liyun Cao,Dinghan Liu,Xiaoyi Li,Mengfan Niu,Guoting Xu,Koji Kajiyoshi,Liangliang Feng
Exploring low-cost and highly active photocatalysts with noble metal-free cocatalysts is of great significance for photocatalytic hydrogen evolution under simulated sunlight irradiation. In this work, a novel V-doped Ni2P nanoparticle loaded g-C3N4 nanosheet is reported as a highly efficient photocatalyst for H2 evolution under visible light irradiation. The results demonstrate that the optimized 7.8 wt% V-Ni2P/g-C3N4 photocatalyst exhibits a high hydrogen evolution rate of 271.5 μmol g−1 h−1, which is comparable to that of the 1 wt% Pt/g-C3N4 photocatalyst (279 μmol g−1 h−1), and shows favorable hydrogen evolution stability for five successive runs within 20 h. The remarkable photocatalytic hydrogen evolution performance of V-Ni2P/g-C3N4 is mainly due to the enhanced visible light absorption ability, the facilitated separation of photo-generated electron–hole pairs, the prolonged lifetime of photo-generated carriers and the fast transmission ability of electrons.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
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IF 4.4
Tao Xu,Rongyan Wang,Chenjie Gu,Tao Jiang
Surface-enhanced Raman scattering (SERS) technology enables to satisfy the increasing demand of clinical drug monitoring due to the superiority of fingerprint recognition, real-time response, and nondestructive collection. Here, a novel graphitic carbon nitride (g-C 3 N 4 )/ molybdenum disulfide (MoS 2 )/Ag composite substrate with a 3D surface structure was successfully developed for the recyclable detection of gefitinib in serum. Attributed to the uniform and dense “hotspots” on the shrubby active surfaces in conjunction with the potential synergistic chemical enhancement of g-C 3 N 4 /MoS 2 heterosystem, a remarkable SERS sensitivity with an attractive enhancement factor value of 3.3 × 10 7 was demonstrated. Meanwhile, a type-II heterojunction between g-C 3 N 4 and MoS 2 enabled more efficient diffusion of photogenerated e − -h + pairs assisted by the localized surface plasmon resonance of Ag NPs, which contributed to the reliable recyclable detection of gefitinib. The ultra-low limit of detection at 10 −5 mg/mL and high recycling rates of gefitinib beyond 90% in serum were successfully realized. The results demonstrated the as-prepared SERS substrate has tremendous potential to be untilized for in-situ drug diagnostics.
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Nano Energy
·
2021
·
IF 17.881
Xue Li,Jundie Hu,Tingyu Yang,Xiaogang Yang,Jiafu Qu,Chang Ming Li
Effectively utilize photogenerated holes (h + ) of catalysts while blocking rapid recombination of photoinduced carriers are the two critical challenges for solar-to-hydrogen (STH) conversion. Here, an exquisite 2D/2D LaVO 4 /g-C 3 N 4 (LaVO 4 /CN) heterostructure is delicately designed and fabricated for efficient photocatalytic H 2 -evolution while producing high value-added furfural simultaneously. The abundant biomass furfuryl alcohol (FFA) is employed to substitute the traditional h + sacrificial agents such as triethanolamine (TEOA) for the oxidation half reaction, which is very meaningful to balance the H 2 -evolution half reaction. The LaVO 4 /CN heterojunction enables 3-time increased H 2 -evolution and a high furfural-production rate (0.95 mmol g −1 h −1 ) than that of pristine graphite carbon nitride (g-C 3 N 4 , labeled as CN), and with a 22.16% H 2 -evolution apparent quantum efficiency (AQE) irradiated at 400 nm. This work provides an exquisite catalyst and a new strategy for efficient photocatalytic H 2 -evolution coupled with production of high valuable chemicals.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2021
·Vol. 52
·期 3
·573-581
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IF 2.8
Zhao Ruiyu,Wang Yi Mou,Li Jie,Meng Wenhua,Yang Chunli,Sun Chongxiang,Lan Xuefang
Ni, Ce, and Ta modified Ti/SnO 2 –Sb 2 O 5 –RuO 2 anodes were first prepared by thermal decomposition strategy and applied for Orange G degradation to explore the effect of Ni, Ce, and Ta modification on electrocatalytic property. The Ta modified anode showed the highest ·OH generation capability and the lowest charge transfer resistance among all samples, conducive to electrocatalytic degradation of Orange G. Besides, the Ta modified anode shows more cracks than Ni and Ce modified anodes, which is expected to create more specific surface areas and more exposed active sites for Orange G degradation. The degradation efficiency and the total organic carbon (TOC) removal rate increased in the order Ru < Ru–Ni < Ru–Ce < Ru–Ta, with Ru–Ta showing the highest degradation efficiency of 98.6% and 44.2%, much higher than 79.6% and 27.5% of Ru, respectively.
Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Dongxu Wang,Juan Chen,Xin Gao,Yanhui Ao,Peifang Wang
Effective contact between photocatalysts and algal cells is important for algae inactivation because of the efficient transfer/utilization of photo-generated charges. Herein, sulfuric acid exfoliated C 3 N 4 (S-CN) is found to be efficient for algae inactivation under visible light irradiation (92% removal rate within 3.5 h). The high performance can be ascribed to the positive surface charge (S-CN can be rapidly adsorbed on the surface of algal cells) and small sized/ultrathin structure (high separation/transfer efficiency of charges). Furthermore, the efficiency can be improved significantly by H 2 O 2 addition (94.3% removal rate within 1.5 h). The addition of H 2 O 2 not only reduce the recombination of photo-induced carriers but also generate more ·OH. Decreased photosynthetic activity, membrane damage and cell rupture occur in the inactivation process. In addition, the organic matters release and leak from algal cells are also partly removed. The present work has great significance in the application of photocatalytic technology for algal remediation.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Jingjun Liu,Haiping Zhou,Jiajie Fan,Quanjun Xiang
With photoconductor being transferred and separated, interface contact plays a crucial role in developing composites photocatalyst . In the present work, 2D crystalline g-C 3 N 4 (called as CCN) with 2D TiO 2 nanosheets (called as TO) obtained in situ oxidized single-layered Ti 3 C 2 T x MXene is designed by an electrostatic self-assembly technology. This CCN/TO nanosheets system with a few TiO 2 nanosheets distributed to the surface is not only prolonging lifetime of photoelectron but also stimulating photogenerated carriers transferred in contact interface. The electron transfer mechanism of CCN/TO is further proved by Pt photo-deposition method. Therein, the optimal CCN-TO-0.6 exhibits excellent performance of H 2 generation compared with single photocatalyst of CCN. The result shows that the crystalline g-C 3 N 4 photocatalysts introduced TiO 2 with interfacial effect favorably reduce H + to H 2 and enhance photocatalytic activity .
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
·
IF 4.098
Lingfeng Qin,Bo Feng,Qi Luo,Zihang Zeng,Peng Zhang,Xiaosheng Ye,Taiping Qing
Improper dosage of Bleomycin (BLM) can easily lead to a series of side effects such as pulmonary fibrosis and pulmonary toxicity. Therefore, detecting the content of BLM in actual sample is very helpful to make full use of its therapeutic efficacy and reduce its toxicity. Herein, we constructed a copper ion and G-quadruplex mediated label-free sensor to detect BLM. The strategy mainly relies on the chelation of BLM to copper ions, which makes the copper ions lose the quenching ability to the fluorescent dye N-methylmesoporphyrin (NMM) after chelation. With the assistance of the G-quadruplex, the BLM content in the sample can be detected by observing the change in fluorescence. A good linear relationship can be clearly observed within the BLM concentration range of 0.1 nM-75 nM, and the limit of detection was derived as 0.1 nM. This sensor did not involve any labeling or addition of Fe 2+ , even in the presence of 10 different antibiotics and 11 different metal ions, it still has a good monitoring effect, and can be successfully applied to the detection of BLM in serum and wastewater. Thus, we believe that this work hold great potential in antibiotic monitoring and environmental protection.
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Journal of CO2 Utilization
·
2021
·
IF 7.132
Xiaoyue Huang,Yan Hu,Liang Zhou,Juying Lei,Lingzhi Wang,Jinlong Zhang
As a greenhouse gas, CO 2 is also a rich carbon resource. Using sunlight to reduce CO 2 to usable substances through photocatalysis can alleviate the greenhouse effect and realize energy recycling. Herein, CuS nanoparticles are grown in situ on the surface of inverse opal g-C 3 N 4 by a one-step hydrothermal method. The inverse opal structure can increase the specific surface area of the material, and CuS can be used as the cocatalyst to accept photo-generated electrons on the conduction band of g-C 3 N 4 , thereby promoting the separation and transfer of photo-generated charges. And the interfacial charge transfer mechanism of CuS further improves the separation efficiency of photogenerated electrons and holes. The photocatalytic reduction of CO 2 activity of the prepared catalyst is greatly improved. The CO yield reaches 13.24 μmol g −1 h −1 . A new strategy is provided to develop artificial photosynthesis for reduction of CO 2 .
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xingchao Zhang,Ruoyu Zhang,Siying Niu,Jiming Zheng,Chongfeng Guo
The MoS 2 /g-C 3 N 4 heterojunction composite (marked as MoS 2 /g-C 3 N 4 -H) was successfully prepared via calcining the melamine coated MoS 2 nano-sphere, where the thin g-C 3 N 4 nano-sheets were tightly grown on the surface of MoS 2 nano-sphere to form MoS 2 inlaying in g-C 3 N 4 heterostructure. The detailed charge transfer mechanism was discussed by combining theoretical calculation and experiments, in which the intrinsic cause of photo-generated charge separation and transfer was determined as the directional built-in electric field driven by different Fermi levels of MoS 2 and g-C 3 N 4 . Comparatively, the enhanced photo-catalytic performance and stability of the sample were assessed by degrading the Rhodamine (RhB) and reducing the Dichromate (Cr 6+ ) solutions under the irradiation of the simulated sunlight, which could be attributed to the widened spectral absorption range and improved electron-hole separation rate. Based on above results, the photo-catalytic mechanism involving redox reactions was also clearly proposed.
研究领域:
材料科学
·
环境科学
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Jiayi Wang,Penggang Ren,Xueyan Zhao,Zhengyan Chen,Yanling Jin,Zengping Zhang
Graphite nitride (g-C 3 N 4 ) photocatalyst has attracted tremendous attention because of its suitable visible light-driven band gap, facile synthesis from low-cost nitrogencontaining organic precursors, and high stability. To address the limitations of conventional single modification methods. Here, a novel homojunction photocatalyst was developed by combining defective g-C 3 N 4 (CNx) and flaked g-C 3 N 4 (CN) through alkali etching and acid stripping techniques. Compared to the conventional g-C 3 N 4 , the homojunction photocatalyst (CNx/CN) exhibited white tremella-like folds, and the homojunction structure allowed faster transfer and separation of electrons and holes in CNx/CN. Under the synergistic effect of morphological modulation and homojunction construction, CNx/CN exhibited excellent degradation performance (the degradation for MB is 94.2 %) in the degradation of methylene blue (MB) and showed excellent cycling stability after four cycling experiments. Furthermore, CNx/CN exhibited satisfactory practicality in several simulation experiments, including evaluations of pH, co-existing cations, and real water. This work provides a new strategy for constructing an efficient g-C 3 N 4 -based homojunction photocatalyst for practical application in contaminated water treatment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Lan Ding,Yaoyao Tang,Siyang Wang,Yuqi Zhang,Xinyi Chen,Hongjun Zhou
Exploiting photocatalysts with high interfacial charge separation efficiency remains a huge challenge for converting solar energy into chemical energy. Herein, a novel 0D/2D heterojunction is successfully constructed by using bimetallic Mo 2 Ti 2 C 3 MXene Quantum Dots (Mo 2 Ti 2 C 3 QDs) firmly immobilized on the surface of g-C 3 N 4 nanosheet via an electrostatic self-assembly strategy. The Mo 2 Ti 2 C 3 QDs/g-C 3 N 4 exhibits an efficient and stable photocatalytic hydrogen production performance up to 2809 µmol g -1 h −1 , which is 7.96 times higher than pure g-C 3 N 4 nanosheet , and prominently exceeding many reported photocatalysts. Besides, a prominent apparent quantum yield achieves 3.8% at 420 nm. The significant performance improvement derives from the giant interfacial electric field that formed between large interface contact areas, ensuring greatly efficient separation and transfer of the photogenerated carriers. Furthermore, the 0D/2D heterojunction possesses high-quality interfacial contact, which reduces the interfacial recombination of photoinduced electrons and holes, causing the quick electron transfer from the g-C 3 N 4 to electron acceptor Mo 2 Ti 2 C 3 QDs, thus enhancing the charge utilization. Kelvin probe force microscopy (KPFM) measurements and density functional theory (DFT) calculation comprehensively demonstrate that g-C 3 N 4 modified by Mo 2 Ti 2 C 3 QDs can modulate the electronic structure and prompt the establishment of the interfacial electric field, which consequently leads to efficient photocatalytic activity . This study adequately illustrates that constructing heterojunction interfacial electric fields based on MXene quantum dots is a prospective pathway to engineering high-performance photocatalytic platforms for solar energy conversion .
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 99
·期 2
·415-425
·
IF 3.4
Mingliang Chen,Guanghui Wang,Jialing Dai,Haifeng Li,Nansheng Deng
BACKGROUND There is increasing concern regarding the rising issue of Cr(VI) pollution in aqueous solutions. It is crucial to find an effective technology for the removal of Cr(VI) in aqueous solutions. In this work, a novel TiO 2 /BC/g-C 3 N 4 heterostructure photocatalyst was successfully prepared by a simple hydrothermal method and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectroscopy, photoluminescence, ultraviolet–visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The photocatalytic reduction behavior of Cr(VI) on the TiO 2 /BC/g-C 3 N 4 heterostructure was investigated under visible light irradiation, and the possible mechanism of photocatalytic reduction of Cr(VI) was elucidated. RESULTS The TiO 2 /BC/g-C 3 N 4 heterostructure photocatalyst exhibited better photoreduction activity for Cr(VI) under visible light irradiation. After 100 min irradiation with visible light, the TiO 2 /BC/g-C 3 N 4 photocatalyst achieved a removal efficiency of 89% for Cr(VI). Compared with TiO 2 , TiO 2 /BC and TiO 2 /g-C 3 N 4 , the photocatalytic removal efficiency of Cr(VI) on the TiO 2 /BC/g-C 3 N 4 increased by 40%, 20% and 10% respectively. The photocatalytic reduction of Cr(VI) was dependent on the initial concentration of Cr(VI), catalyst dosage, pH value and atmosphere. Moreover, TiO 2 /BC/g-C 3 N 4 presented excellent stability and reusability after five cycles. CONCLUSION The TiO 2 /BC/g-C 3 N 4 heterojunction enables highly efficient photocatalytic reduction of Cr(VI) under visible light irradiation. This enhancement is primarily attributed to the construction of an indirect Z-scheme TiO 2 /BC/g-C 3 N 4 heterojunction, which significantly improves the separation efficiency of photo- generated charge carriers during the photochemical process. Furthermore, the presence of BC enhances the adsorption performance of Cr(VI) on TiO 2 /BC/g-C 3 N 4 , thereby facilitating its photocatalytic reduction. © 2023 Society of Chemical Industry.
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