CARBON
·
2023
·
IF 10.9
Hao Wang,Jiangwen Liao,Jiajun Zhong,Yunpeng Liu,Lei Yao,Lixiong Qian,Yuecheng Lai,Xin Wang,Yikun Li,Jianxin Song,Xueqing Xing,Guang Mo,Zhongjun Chen,Zhonghua Wu
In this paper, the unclear Ni atom coordination structure evolution in one-pot pyrolysis method synthesizing Ni single atom catalyst using graphitic carbon nitride as support (Ni-g-C 3 N 4 ) was deeply discussed. In-situ X-ray absorption fine structure spectra and other assisted methods were used to characterize the structural evolution. The results demonstrate that the pyrolysis process can be divided into three stages. In the first stage from room temperature to 183 °C (Stage I), the NiCl 2 ⋅6H 2 O was mixed with the supporting material (dicyandiamide) to form the precursor with Ni-(H 2 O) 6 octahedral coordination configuration. In the second stage from 183 to 350 °C (Stage II), the H 2 O molecules have been removed and the supporting material was converted to melamine. The melamine molecules were polycondensed to melem during 308–350 °C. The intermediates labeled Ni-melamine and Ni-melem was formed with Ni-N 4 planar quadrilateral coordination configuration. In the third stage from 350 to 600 °C (Stage III ), the supporting material (melem) was gradually converted to g-C 3 N 4 , and the Ni-N 4 coordination configurations were replaced by Ni-N 6 planar hexagon coordination configuration one by one. The three Ni coordination configurations were further confirmed by Reverse Monte Carlo simulations and ab initio calculations .
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chun Feng,Lijuan Zhu,Yaqiong Cao,Yin Di,Zongxue Yu,Guhui Gao
This study reports a new strategy for enhancing the anti-corrosion properties of epoxy coatings. For this purpose, beta-cyclodextrin-graphene oxide (β-CD-g-GO) nanosheets were synthesized via anchoring beta-cyclodextrin on a graphene oxide surface in the presence of 3-glycidoxypropyltrimethoxysilane (KH560). The structure of the material was characterized by SEM, EDX, XRD, FT-IR and TGA. The inclusion of 2 wt. % GO and β-CD-g-GO nanosheets in epoxy resin remarkably enhanced the corrosion protection performance of the material relative to that of pure epoxy coating. Electrochemical impedance spectroscopy (EIS) measurements revealed that the impedance of the epoxy coating was improved after the addition of 2 wt. % GO and β-CD-g-GO nanosheets. The most pronounced improvement in the properties of the epoxy coating was obtained using β-CD-g-GO nanosheets. Scratches tests confirmed the reduced steel substrate corrosion in the case of epoxy coating that included β-CD-g-GO nanosheets compared to the corrosion obtained for other samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 30
·10515-10521
·
IF 4
Yun Wu,Rui Yao,Qiang Zhao,Jinping Li,Guang Liu
The electrolysis of water, particularly proton exchange membrane (PEM) water electrolysis, holds great promise for hydrogen production in industry. However, the catalyst used in this process is prone to dissolution in acidic environments, making it imperative to develop cost-effective, highly efficient, and acid-stable electrocatalytic materials to overcome this challenge and enable large-scale application of PEM water electrolysis technology. Herein, we prepared ruthenium oxide (RuO2)/graphitic carbon nitride (g-C3N4) composites (RuO2/C3N4) via a combination of sol–gel and annealing methods. The g-C3N4 provides a large surface area, while RuO2 is uniformly deposited on the g-C3N4 surface. The interaction between g-C3N4 and RuO2 stabilizes the RuO2 nanoparticles and enhances long-term water oxidation stability. This unique structure and the combined advantages of RuO2 and g-C3N4 yield exceptional electrocatalytic activity toward both the oxygen evolution reaction (OER, 240 mV@10 mA cm−2) and the hydrogen evolution reaction (HER, 109 mV@10 mA cm−2), with excellent durability (over 28 h), and a cell voltage of 1.607 V at 10 mA cm−2 when used in an RuO2/C3N4||RuO2/C3N4 electrolyzer. This study highlights the efficacy of the g-C3N4 support method in designing highly stable Ru-based OER electrocatalysts for efficient acidic water splitting.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Energy and Sustainability Research
·
2023
·Vol. 4
·期 10
·2300072
·
IF 5.8
Haohui Huang,Xingqiang Liu,Feng Li,Qingyun He,Chengfa Tao,Longfu Wei,Changlin Yu,Hongbing Ji
Herein, well-crystallized ZnTiO 3 particles are first prepared by hydrothermal method. A series of S-scheme heterojunction photocatalysts of ZnTiO 3 /g-C 3 N 4 (referred to as ZTO/CN) with different mass ratios are synthesized by successfully doping ZnTiO 3 in g-C 3 N 4 precursors and loading ZnTiO 3 onto g-C 3 N 4 nanosheets by calcination. It is clearly found that the ZnTiO 3 particles are successfully loaded on g-C 3 N 4 nanosheets by the X-ray diffractometer, energy-dispersive X-ray spectra, and high-resolution transmission electron microscopy images. Moreover, the specific surface area of 3.0% ZTO/CN is higher than that of pure g-C 3 N 4 . Using triethanolamine as the hole sacrificial agent, the highest CO and H 2 yields are achieved in the 3.0% ZTO/CN composite catalyst under the xenon lamp irradiation for 1 h. The generation rates of CO and H 2 reach 15.19 and 5.77 μmol g −1 h −1 , respectively, which are 2.9 and 4.1 times higher than that of pure g-C 3 N 4 . The CO and H 2 yields of the ZTO/CN composite catalyst show a trend of increasing and then decreasing with the increasing of ZnTiO 3 content, which is due to the fact that excess ZnTiO 3 can lead to a reduction of the effective heterojunction interface between ZnTiO 3 and g-C 3 N 4 , decreasing the transfer and separation efficiency of photogenerated electrons and holes and thus reducing the photocatalytic activity.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Feng Yang,Xiujiu Yang,Shaojun Chen,Hong Hai,Xiaoping Wei,Xiaoming Wan,Wenguang Jiao,Jiaji Yi
Developing rapid and renewable sensors to detect heavy metal lead ions is a crucial and promising area of research. Herein, we constructed a label-free electrochemiluminescence (ECL) sensor for detecting Pb 2+ using magnetic nanoparticles that were modified with a G-quadruplex probe. The aptamer probe was created by immobilizing a double-stranded DNA (dsDNA) onto the surface of Fe 3 O 4 @Au magnetic nanoparticles, with Ru(phen) 3 2+ being intercalated into the dsDNA structure. Upon introduction of Pb 2+ , the dsDNA structure opened up to form the Fe 3 O 4 @Au-G-quadruplex-Pb 2+ structure, resulting in the dissociation of single-stranded DNA (ssDNA) and Ru(phen) 3 2+ . The dissociated Ru(phen) 3 2+ acted as an ECL probe, allowing for the construction of a highly sensitive sensing system that quantitatively relates Pb 2+ concentrations to ECL signals. In the presence of the strong chelating agent EDTA, the hybridization of the two ssDNA strands back into the dsDNA structure allowed for the re-insertion of Ru(phen) 3 2+ into the dsDNA structure, endowing the sensor with excellent renewability. The adapter sensor was characterized using cyclic voltammetry, electrochemiluminescence, and fluorescence spectroscopy. Over the range of 50 pM to 9 nM, the Pb 2+ concentration exhibited a linear relationship with its corresponding ECL signal, with a detection limit of 1.2 pM. In addition, the biosensor demonstrated outstanding selectivity, stability, reproducibility, and potential for use in real-world sample applications.
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 9
·1043
·
IF 4.501
Shuang Tang,Yang-Sen Xu,Wei-De Zhang
Molecular skeleton modification has become a recognized method that can effectively improve the photocatalytic performance of g-C3N4because it not only effectively promotes charge separation, but also tunes the conjugated system of g-C3N4to make it more conducive to photocatalytic reaction. Herein, thiophene-amide embedded g-C3N4(TA-CN-x) was successfully prepared by simple one-step thermal polycondensation using urea as a precursor and ethyl-2-amino-4-phenylthiophene-3-carboxylate (EAPC) as an additive. After embedding with thiophene-amide, the induction and delocalization effects are formed in TA-CN-x, which significantly improves the migration efficiency of photogenerated charge carriers. Meanwhile, the conjugate structure is changed due to structural modification, resulting in significant enhancement of visible light absorption compared to the pure g-C3N4(CN). Specifically, the optimized photocatalytic H2evolution rate of TA-CN-2 reaches 245.4 μmol·h−1, which is 8.4 times that of CN (with Pt nanoparticles as a co-catalyst), and the apparent quantum efficiency (AQY) at 450 nm is 13.6%. This work opens up a new modification process for fully tapping the photocatalytic hydrogen absorption potential of g-C3N4-based materials.Keywords:photocatalysts;g-C3N4;thiophene-amide;embedding;induction effect;delocalization effect;hydrogen evolution
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 3
·8098-8109
·
IF 5.19
Shan Junyue,Wu Xianliang,Li Caifang,Hu Jiwei,Zhang Zhenming,Liu Huijuan,Xia Pinhua,Huang Xianfei
The photocatalytic degradation of antibiotics requires a good separation efficiency of photogenerated electron–hole pairs and a wide visible light absorption range. Current studies have discussed the successful preparation of ferroferric oxide/graphite carbon nitride/reduced graphene oxide (Fe 3 O 4 /g-C 3 N 4 /rGO). The phase structure and morphology of the Fe 3 O 4 /g-C 3 N 4 /rGO composites were characterized by XRD, HR-TEM, SEM, and EDS. The obtained composites were used to degrade tetracycline hydrochloride (TCH) to evaluate its photocatalytic activity. The effects of four variables on the degradation of TCH were analyzed by the response surface method and artificial intelligence (gradient regression tree, random forest, artificial neural network, etc.). The results showed that the graphite carbon nitride in the catalyst maintained its original structure and that the photocatalytic activity was significantly improved. The degradation rate of TCH was 86.7% under the optimal conditions (the Fe 3 O 4 /g-C 3 N 4 /rGO dosage was 0.1 g, pH = 7.0, the initial concentration of TCH was 20 mg/L, and the visible light irradiation time was 60 min). At the same time, the degradation rate of TCH changed little after the material was used five times, which indicates that the stability and recyclability of the Fe 3 O 4 /g-C 3 N 4 /rGO photocatalyst were excellent. Finally, a possible photocatalytic mechanism of the Fe 3 O 4 /g-C 3 N 4 /rGO photocatalyst is proposed in this paper.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Chengyuan Yang,Jing Wang,Rong Wang,Wenxin Zhu,Liang Zhang,Ting Du,Jing Sun,Ming-Qiang Zhu,Yizhong Shen,Jianlong Wang
Multi-pollutants environment coexisted organic and inorganic pollutants has become a common phenomenon, seriously affecting water biodiversity and human water security. Currently, the removal of organic and inorganic pollutants by photocatalysis are mostly in own single-pollutant environment, not in multi-pollutants system, where the common photocatalysts cannot achieve efficiently charge separate and transfer with low reactive oxygen species (ROS) efficiency. Herein, we constructed an efficient cascaded Z-scheme heterojunction Co 9 S 8 @defective ZnS/g-C 3 N 4 (C@DZ/N) composed of defective engineering in hollow nanocubes, which achieved excellent photodegradation activity (98.93 % for ciprofloxacin (CIP) and 97.18 % for Cr(VI) at 90 min) in multi-pollutants environment, significantly higher than the hollow cubic with Z-scheme heterojunction in single-pollutant environment (98.07 % for CIP and 98.72 % for Cr(VI) at 140 min). Defective ZnS acts as the core for direct charge transfer and separation to form a unique cascaded Z-scheme heterojunction system that blocks the type II charge transfer pathway to achieve ultra-efficient charge transfer. Furthermore, the structural characterization and ROS experimental results based on multi-pollutants models show that the cascade Z-scheme system greatly facilitates the ROS release kinetics and further leads to more electron-deficient cubic surfaces while increase the directional conversion to singlet oxygen ( 1 O 2 ) in multi-pollutants environment. Further tests of intermediates and reusability indicated its potential for the high-efficient treatment of multiple pollution systems.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Cheng Feng,Congting Zhang,Chang Xu,Shuang Lin,Baohua Zhang,Huanxing Wu,Zheng Zhang,Xinming Guo,Haineng Bai,Fuqiang Guo
The detection of H 2 S for biomarkers or special occasions often requires a lower detection limit. In this work, the ppb-level H 2 S sensor based on MoO 3 /CuO/g-C 3 N 4 (MCC) was presented by a simple method. The characterized results show that MCC-2 possesses a larger specific surface area, and has more adsorbed oxygen and oxygen vacancy compared to MoO 3 and MoO 3 /CuO. The gas-sensitive test results show that the response of the MCC-2 sensor to 1000 ppb H 2 S is up to 8.24 at room temperature , which is 1.31 times of MoO 3 /CuO (6.28). More importantly, the theoretical detection limit of the MCC-2 sensor is as low as 1.1 ppb, which is the lowest in the recent H 2 S sensor. In addition, the MCC-2 sensor has reliable repeatability, excellent selectivity to H 2 S, and still maintains a high response after continuous test for 5 weeks. Simultaneously, the MCC-2 sensor also keeps an outstanding response at high relative humidity. The excellent gas sensing properties are due to the larger specific surface area that can enable more gases to be adsorbed on the material surface. In addition, the oxygen vacancy reduces the energy required to adsorb the target gas and the formed heterojunctions by MoO 3 /CuO/g-C 3 N 4 expedite carrier migration.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 40
·e52813
·
IF 3.057
Hongbin Li,Jiliang Dai,Yue Hu,Heshan Zheng,Xiumin Ge,Yongqiang Guo,Shuzhen Gao,Chao Liu
Herein, the poly(vinylidene fluoride) (PVDF) composite membranes blended with pineapple leaf nanocrystalline cellulose (PLNC) and g-C 3 N 4 for ultrafiltration were designed and fabricated via surface segregation during non-solvent induced phase separation. The incorporation of PLNC and g-C 3 N 4 endows the PVDF composite membrane with a higher porosity, enhancing the pure water flux of PVDF/g-C 3 N 4 /PLNC membrane by 256.75% compared to the PVDF membrane, while maintaining a higher water flux recoveries of 82.1%. Moreover, surface chemical compositions, surface and cross-section morphologies, degree of crystallinity were also characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffraction, respectively. The mechanical properties of the PVDF composite membranes were also investigated. All the above experimental data showed that the addition of PLNC and g-C 3 N 4 can greatly improve the performance of the PVDF membrane. The prepared modified membrane has potential application value in the field of wastewater separation and treatment.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 20
·16077-16098
·
IF 2.779
Chen Keke,Feng Hange,Li Lingwei,Luo Menghao,Xue Shaolin,Sang Jingxin
The excellent photoresponse of semiconductors enables them as a promising photocatalyst for photocatalytic degradation of organic pollutants and antibiotics, but their practical applications are limited by photogenerated carrier recombination, instability, and fixed energy band positions. Herein, we designed and synthesized a dual Z-scheme flower-like spherical Ag 3 PO 4 /MoS 2 /g-C 3 N 4 (AMN) photocatalyst loaded with different mass of g-C 3 N 4 (3, 5 and 7 mg). Under visible light irradiation, MoS 2 enhanced the light absorption range of AMN composite. The holes concentrated in the valence band of Ag 3 PO 4 provide strong oxidation capacity, and the electrons retained in conduction band of g-C 3 N 4 provide strong reduction ability in the photocatalytic system. It is helpful to improve the separation efficiency of photogenerated carriers and enhance the photocatalytic activity of AMN composite. The AMN photocatalyst loaded with 5 mg g-C 3 N 4 (AMN-5) has the optimal photocatalytic activity. The photocatalytic degradation efficiency of the photocatalyst for methylene blue (MB) within 24 min is 3.98, 1.85, and 1.17 times that of g-C 3 N 4 , Ag 3 PO 4 , and Ag 3 PO 4 /MoS 2 , respectively. After three cycles, the degradation efficiency of AMN-5 for MB decreased from 99.44% to 90%, about 3.79 times of Ag 3 PO 4 (23.77%). In addition, the optimal AMN-5 photocatalyst also has excellent photocatalytic degradation efficiency for Rhodamine B (RhB) and tetracycline (TC). This design and concept provide a promising insight for the photocatalytic degradation of pollutants.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Tang Zhou,Lei Zhao,Dingsheng Wu,Quan Feng,Baobao Zhao
As an emerging and promising technology , photocatalytic technology can effectively remove trace organic pollutants such as tetracycline hydrochloride (TC-H, an antibiotic) in water. However, the research on photocatalysis is mainly focused on the powder photocatalyst, which is difficult to separate from the water body after use. Generally, fixing the photocatalytic material on a specific carrier can effectively avoid the above problems. In this article, we uniformly assembled g-C 3 N 4 on bacterial cellulose (BC) with 3D nanofiber network and enhance its catalytic activity by polypyrrole (PPy). Different from the modification of the photocatalyst in most studies, we have effectively improved the catalytic activity through the design of the support material and reactor in this work. The PPy@(BC/g-C 3 N 4 ) flexible membrane prepared has high-efficiency catalytic performance (64.28%, 2 h, TC-H) under a low-power xenon lamp (λ > 420 nm) in the reactor designed, which is 5.27 times the catalytic efficiency of the original BC/g-C 3 N 4 (12.20%, 2 h, TC-H). After 10 times of repeated use, it can stably retain more than 80% of the initial catalytic activity. Specifically, we propose to introduce oxygen in the active substrate generation stage and construct a photoelectrocatalytic reaction cell. This study can be used as a general strategy to prepare flexible membrane materials with high-efficiency catalytic properties.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）