Journal of Inorganic and Organometallic Polymers and Materials
·
2021
·Vol. 32
·期 3
·973-983
·
IF 3.543
Yu Mingwei,Zhang Lianhong,Wen Jie,Zhang Hui,Liu Faping,Lv Yanjun,Zhao Xiaodong
The remove of the organic pollutants in water plays an important role on the environmental protection, thus photocatalysis, as an effective method, has been attained much attention to deal with this problem. In this paper, a composite of g-C 3 N 4 and Mg–Al hydrotalcite derived metal oxides was prepared by simple co-precipitation methods followed by calcination. The effective adsorption-photocatalysis synergic effect and highly efficient removal of organic pollutants from water under simulated sunlight irradiation was found in the presence of fabricated metal oxide nanocomposites. The photocatalytic degradation rate of methylene blue reached 97.3% within 1 h under visible light, and the degradation rate constant was 0.0432 min −1 , which is 3.6 times that of g-C 3 N 4 . Though characterization analysis, more active sites are exposed to absorb more organic pollutants on the mater surface in the presence of the open hierarchical structures of composite materials, and the "face to face" contact structure between 2D materials is formed to promote the separation of electrons and holes. The photocatalytic degradation was stable in the recycling process of the catalyst. In addition, the photocatalytic degradation mechanism of the catalyst was explained by free radical scavenging experiment. The material provides an effective method for removing organic pollutants in water, and has broad application prospects.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Enzhou Liu,Chenyang Jin,Chenhui Xu,Jun Fan,Xiaoyun Hu
Transition metal phosphides are considered as the most prospective replacements for noble metal cocatalysts used for H 2 evolution during photocatalytic water splitting. In this work, Ni 2 P/g-C 3 N 4 composite photocatalyst was synthesized using a simple in-situ hydrothermal method by one step. Benefiting from the excellent light trapping, efficient transfer of charge carriers and strong stability of Ni 2 P nanoparticles , as well as the stable interface contact between Ni 2 P and g-C 3 N 4 , the Ni 2 P/g-C 3 N 4 exhibit greatly enhanced H 2 evolution performance during photocatalytic water splitting . The optimized H 2 evolution rate can reach 3344 μmol h −1 g −1 over 17.5 wt% Ni 2 P/g-C 3 N 4 , which is 68.2 times greater than that of pure g-C 3 N 4 and even much greater than that of 15 wt% Pt/g-C 3 N 4 . The apparent quantum efficiency (QE) is about 9.1% under 420 nm monochromatic. The enhancement mechanism was demonstrated in detail by transient photocurrent responses, photoluminescence spectra and electrochemical impedance spectroscopy . This work develops a facile strategy to fabricate transition metal phosphide/semiconductor heterojunction systems with potential application for photocatalytic H 2 evolution.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jiayi Chen,Xinyan Xiao,Yi Wang,Zhihao Ye
Novel hierarchical sheet-on-sheet WO 3 /g-C 3 N 4 (WOCN) composites were successfully fabricated by simple calcination method using acid-treated SrWO 4 /g-C 3 N 4 as precursors. The morphological observation showed that WO 3 nanosheets were closely anchored on the surface of g-C 3 N 4 nanosheets to construct a hierarchical nanostructure . The as-synthesized WOCN composites exhibited a significantly higher photocatalytic activity towards the photocatalytic degradation of rhodamine B (RhB) compared to pristine g-C 3 N 4 and WO 3 under simulated sunlight irradiation. The optimum photocatalytic activity of the WOCN at a WO 3 mass content of 34.6% was 6.5 and 3.0 times higher than that of pristine WO 3 and g-C 3 N 4 , respectively. The enhanced photocatalytic activities of WOCN composites were attributed to the formation of hierarchical heterostructure , which provided larger specific surface area, better visible-light absorption capability, reduced the recombination of photogenerated electron-hole pairs and enhanced separation efficiency of charge carriers. A Z-scheme photocatalytic mechanism was proposed according to active species trapping experiments.
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Functional Materials Letters
·
2021
·
IF 2.17
Xu Huang,Yiwen Zhang,Zhi Liang,Yingfeng Zhao,Huiwen Yuan,Mingyang Li,Fengping Peng,Wei Wang
In this paper, a series of isotype heterojunction photocatalysts with urea-derived g-C 3 N 4 (CNU) as the core and cyanamide-derived g-C 3 N 4 (CNC) as the shell are reported. A much thinner CNC shell which can protect the CNU core from thermal etching and determines the light absorption is beneficial to improve the photocarrier transfer and separation efficiency, pore volume, and the overall crystalline degree of the most active CNU/CNC2 core–shell isotype heterojunction photocatalyst for rhodamine B (RhB) degradation. Contrast experiments confirm that the electron-derived oxidant species (⋅O 2 − ) play key roles in driving the RhB degradation.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 37
·15908-15918
·
IF 3.288
Xiuna Yu,Zhixiang Liu,Yemei Wang,Hongyu Luo,Xu Tang
Insights into active sites and charge transport behavior are challenging topics for fabricating composite photocatalysts and investigating their photocatalytic degradation reaction mechanisms. Herein, novel composites comprising biomass charcoal and graphitic carbon nitride (CN) were fabricated via facial alkali catalysis and thermal condensation of corncob and melamine precursors. By fine-tuning the calcination temperature, the carbonization temperature of corncob-derived biomass charcoal was controlled, which had a great influence on the optimal photocatalytic activity of C–CN-600, which was 90% of the degradation activity of 2-mercaptobenzothiazole (MBT), and about 2-fold higher than that of pure CN. The corncob not only acts as a precursor for biomass charcoal, but can also prevent the agglomeration of CN at high temperature. Moreover, the charge carrier lifetime, visible light absorption and surface area are also revealed in detail by systematic characterization. In addition, the intermediate products of MBT, the degradation reaction pathway, and the mechanism over C–CN are revealed in depth.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Min Luo,Yu Bai,Rui Sun,Zhenhua Wang,Wang Sun,Peng Lin,Xian Dai,Kening Sun
Lithium–sulfur batteries are considered as one of the most potential energy storage devices in the future owing to their ideal theoretical energy density and specific capacity. However, the shuttle of soluble polysulfides and sluggish redox kinetics of polysulfides lead to insufficient use efficiency of active sulfur and the rapid capacity fading. In this study, novel Co-doped g-C3N4 (Co–CN) nanosheets are fabricated by a simple calcination process. The high discharge capacity of the commercial bulk S cathode with the Co–CN-modified separator is 1121 mAh g–1 at 0.2C with a satisfying rate performance of up to 3C. The Co–CN-modified separator also leads to excellent stability (640 mAh g–1 after 250 cycles) with high Coulombic efficiency of over 98%. At the sulfur mass loading of 3 mg cm–2, the cell can still deliver a discharge capacity of 719 mAh g–1 after 100 cycles with a high capacity retention of 95%. The improved performance can be attributed to the effective restriction of polysulfides shuttle due to the enhanced adsorption and catalytic conversion of polysulfides by the Co–CN nanosheet-modified separator. This work shares a simple and highly efficient strategy for increasing the performance of lithium–sulfur batteries.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Pinliang Lai,Jiasheng Li,Zhaojun Xu,Bing Wang,Guomin Li
With the increasing demand for preservatives in industries such as food, cosmetics, and pharmaceuticals, the environmental pollution associated with these compounds has attracted growing concern. Although preservatives are widely applied across diverse sectors, their environmental persistence and degradation behavior remain underexplored. In this study, a novel Z -scheme g-C 3 N 4 /Bi 2 O 2 CO 3 photocatalyst was synthesized, and two commonly used preservatives—potassium sorbate (PS) and methyl para-hydroxybenzoate (MPB)—were selected as model pollutants to systematically investigate the photocatalytic performance of the prepared composite. The results demonstrated that the g-C 3 N 4 /Bi 2 O 2 CO 3 heterostructure exhibited remarkable photocatalytic activity under UV light irradiation, achieving degradation efficiencies exceeding 98 % within 40 min. Furthermore, characterization tests and density functional theoretical (DFT) calculations jointly confirmed that the g-C 3 N 4 /Bi 2 O 2 CO 3 heterojunction follows a typical Z -scheme charge transfer mechanism. This Z-scheme configuration allows the photocatalyst to retain strong redox potentials, thereby improving its overall redox capability and photocatalytic efficiency. Meanwhile, Liquid Chromatograph Mass Spectrometer (LC-MS) analysis combined with toxicity assessment experiments proved the effectiveness and safety of g-C 3 N 4 /Bi 2 O 2 CO 3 in degrading preservatives. These findings offer a promising strategy for the design of high-performance Z -scheme heterojunction photocatalysts for the efficient degradation of environmental contaminants such as preservatives.
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Linghui Ding,Chuanhui Geng,Yan Hao,Kecun Ma,Mei Liu,Pengfei He,Zhi Chen,Qingguo Chen
A new lotus-like Bi 2 WO 6 /Bi 2 S 3 /g-C 3 N 4 composite was synthesized through hydrothermal reaction and physical doping techniques. And the degradation of norfloxacin (NFX) using Bi 2 WO 6 /Bi 2 S 3 /g-C 3 N 4 (BiSW-GCN) photocatalytic material was investigated. Scanning electron microscopy (SEM) revealed that spherical Bi 2 S 3 and flake-like g-C 3 N 4 were closely adhered to the petals of Bi 2 WO 6 , with a uniform distribution of various elements observed in the Raman spectra. These spectra also indicated a reduction in fluorescence intensity and the recombination rate of photogenerated electron-hole pairs. Through analysis of the degradation efficiency of NFX with varying ratios of the photocatalytic materials, it was determined that the optimal photocatalytic performance was achieved when Bi 2 S 3 constituted 3 % of the Bi 2 WO 6 content, and the Bi 2 WO 6 /Bi 2 S 3 to g-C 3 N 4 ratio was set at 20:1. The influence of pH value, photocatalyst concentration, and NFX concentration on the degradation rate within the reaction environment was examined. Results showed that the material exhibited its highest efficiency in a neutral environment. With the addition of 1 g/L BiSW-GCN, the degradation rate of an 8 mg/L NFX solution reached 92.4 % within 120 min, and the total organic carbon (TOC) removal rate achieved 41.1 %. The kinetic constant for BiSW-GCN was calculated to be 0.0206 min −1 . A trapping experiment demonstrated that the primary toxicity of the photocatalytic process was due to hole action, followed by photoelectron generation. Based on the inhibitory effect of NFX on E. coli , the toxicity of the degraded NFX solution was found to be absent when analyzed using the product intermediate toxicity assessment method, thus confirming the potential for the by-product to be non-toxic.
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Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Fang Wang,Zhe Chen,Zhenzhou Zhu,Jia Guo
Antibiotics in pharmaceutical and aquaculture wastewater is a growing threat to the environment of world, due to the induction of drug-resistant bacteria and the harm to the aquatic organisms. Photocatalytic membrane, which has immobilized photocatalyst on membrane is an effective and environmentally friendly technology for antibiotics degradation. In this study, a novel photocatalytic membrane was prepared by loading ZnO/N-g-C 3 N 4 composite on commercial polymer membrane with glutaraldehyde as a crosslinker through pressure driven filtration. The loading of the photocatalyst over the membranes was validated by Fourier transform infrared spectroscopy, scanning electron microscope and X-ray photoelectron spectroscopy. The photocatalytic properties of ZnO/N-g-C 3 N 4 composite membrane were observed efficient for degradation of tetracycline, ciprofloxacin and ofloxacin in both immersion and filtration model under visible light (λ > 420 nm). Especially, a ZnO/N-g-C 3 N 4 loading amount of 1.12 g/cm 2 and glutaraldehyde concentration of 45% led to the degradation rate of 100% and 80% for tetracycline at 5 mg/L and 10 mg/L, respectively. Low trans-membrane pressure (0.005 MPa) and narrow membrane size (50 kDa) were favorable for antibiotics degradation in filtration model due to long reaction time on membrane surface. Construction and performance of ZnO/N-g-C 3 N 4 composite membrane might provide new strategy for energy saving wastewater treatment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xiang Xie,Wenhua Xue,Xiaoyun Hu,Hongfei Lv,Jun Fan,Bo Chen,Enzhou Liu
The Cu 2−x Se/g-C 3 N 4 heterojunction was successfully constructed using a one-step method and employed to photocatalytic H 2 evolution from water for the first time. The optimal Cu 2−x Se/g-C 3 N 4 -10 wt% exhibits an efficient H 2 evolution rate of 1954.9 μmol·g −1 ·h −1 , which is nearly 2.2 and 18.6 times higher than that of the pristine Cu 2−x Se and g-C 3 N 4 . This could owe to the improved light capturing ability, abundant active sites, efficient charge carriers’ separation for the appropriate band gap structures between Cu 2−x Se and g-C 3 N 4 . In addition, a photocatalytic H 2 production mechanism over Cu 2−x Se/g-C 3 N 4 heterojunction is analyzed based on the investigation on energy band structures and photoelectric properties of the components.
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ChemCatChem
·
2018
·Vol. 11
·期 3
·1069-1075
·
IF 4.674
Rui Tong,Zhi Sun,Xiongwei Zhong,Xina Wang,Jincheng Xu,Ye Yang,Baomin Xu,Shuangpeng Wang,Hui Pan
Graphical Photocatalytic hydrogen production : g-C 3 N 4 /CeCO 3 OH/CeO 2 ternary composite showed greatly enhanced photocatalytic performance for hydrogen production under visible light irradiation. Promoting the separation of photo-generated carriers is significantly important to improve the efficiency of photocatalytic hydrogen production. Therefore, we prepared g-C 3 N 4 /CeCO 3 OH/CeO 2 (CeCeCN) ternary nanocomposite via an easy synthetic way using g-C 3 N 4 and CeO 2 as reactants. A CeCO 3 OH layer was formed and resulted in the novel ternary photocatalyst. The CeCeCN composite shows superior photocatalytic (PC) H 2 generation performance in sunlight excitation. The H 2 evolution rate is about 764 μmol h −1 g −1 , which is over 11 times larger than those of g-C 3 N 4 and CeO 2 . Compared with g-C 3 N 4 and CeO 2 , CeCeCN further shows a larger photo-response current density and a lower charge-transfer resistance. The remarkably increased photocatalytic property of CeCeCN is because of the efficient charge migration induced by the formed heterojunction. Our findings demonstrate that building multi-heterostructures can liberate more excited electrons for efficient hydrogen production under sunlight.
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JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Pengxiang Qiu,Jinhua Yao,Huan Chen,Fang Jiang,Xianchuan Xie
ZnIn 2 S 4 /g-C 3 N 4 heterojunction photocatalyst was successfully synthesized via a simple hydrothermal method and applied to visible-light photocatalytic decomposition of 2,4-dichlorophenoxyacetic acid (2,4-D) from aqueous phase. The flower-like ZnIn 2 S 4 particles were dispersed on the surface of g-C 3 N 4 nanosheets in the ZnIn 2 S 4 /g-C 3 N 4 composite. The composite showed higher separation rate of electron-hole pairs as compared to ZnIn 2 S 4 and g-C 3 N 4 . Consequently, the ZnIn 2 S 4 /g-C 3 N 4 composite exhibited enhanced visible light photocatalytic decomposition efficiency of 2,4-D, within 20% ZnIn 2 S 4 /g-C 3 N 4 composite owning the highest photocatalytic efficiency and initial rate. The initial rates of 2,4-D degradation on g-C 3 N 4 , ZnIn 2 S 4 , and 20% ZnIn 2 S 4 /g-C 3 N 4 were 1.23, 0.57 and 3.69 mmol/(g cat h), respectively. The h + and O 2 − were found to be the dominant active species for 2,4-D decomposition. The photocatalytic degradation pathways of 2,4-D by ZnIn 2 S 4 /g-C 3 N 4 under visible light irradiation were explored. The ZnIn 2 S 4 /g-C 3 N 4 composite displayed high photostability in recycling tests, reflecting its promising potential as an effective visible light photocatalyst for 2,4-D treatment.
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