OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiamei Zhao,Qiangyi Deng,Ziyin Yang,Hongmei Zhang,Conglu Zhang
In this paper, a high-efficient visible light responsive g-C 3 N 4 /CaTiO 3 /CQDs Z-type heterojunction photocatalyst was successfully prepared by a two-step method for the photodegradation of organic pollutants in water. The combination of g-C 3 N 4 , CaTiO 3 and CQDs could produce synergistic effect, which facilitated the separation of carriers, thereby enhancing photocatalytic activity . The photocatalytic kinetic removal rate of g-C 3 N 4 /CaTiO 3 /CQDs for methylene blue could reach about 8 times of g-C 3 N 4 and 5.5 times higher than that of CaTiO 3 . The effects of co-existing ions, initial pH, water source, and humic acid on meloxicam degradation were examined. Repeatability experiments indicated that the composite had good reusability and stability with 81.1 % removal for meloxicam after four cycles. The main active substances of g-C 3 N 4 /CaTiO 3 /CQDs in free radical capture experiment was ⋅O 2 − . Possible degradation pathways of meloxicam were also analyzed. The results highlight the g-C 3 N 4 /CaTiO 3 /CQDs Z-type heterojunction is a desirable photocatalyst for removing organic pollutants in water.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiaoqi Jiang,Qing Li,Wenjie Xia,Zhiwei Huang,Xiaomin Wu,Huawang Zhao,Zhilei Guo,Weixin Kong,Chung-shin Yuan,Guohua Jing,Huazhen Shen
Elemental mercury (Hg 0 ) is the most difficult mercury species to remove from the flue gas. Photocatalysts of transition metal oxide modified TiO 2 can effectively remove Hg 0 . However, the metal oxide easily aggregates into large nanoparticles, reducing the atom utilization efficiency and photocatalytic activity. We presented a facile strategy of employing g-C 3 N 4 as an anchor to successfully load highly dispersed ultrasmall CeO 2 clusters on g-C 3 N 4 /TiO 2 . Moreover, the mechanism of anchoring CeO 2 clusters and charge transfer of the ternary photocatalyst were explored in-depth. The results demonstrated that at 250 °C, the photooxidation efficiency of Hg 0 by CeO 2 -g-C 3 N 4 /TiO 2 was several times higher than that of CeO 2 /TiO 2 , TiO 2 , and g-C 3 N 4 . The cavity of the tri-s-triazine ring anchored small CeO 2 clusters via strong Ce-N coordination bonds. A combined type II and Z-scheme transport paths accelerated the separation of photogenerated electron holes. This research offers valuable surface engineering strategy for highly dispersed ultrasmall cluster decorated TiO 2 .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Xia Zhang,Daolei Wang,Xiaokun Man,Jiang Wu,Qizhen Liu,Yongfeng Qi,Zhiqiang Liu,Xiaoyan Zhao,Jiaxi Wu,Chenyu Hao
The morphology of catalyst is a very important factor influencing the photocatalytic activity of the catalyst. Owing to its scientific and technological importance, controllable preparation of photocatalysts with different morphologies has been studied. In this work, BiOIO 3 /g-C 3 N 4 heterojunction composites are synthesized using hydrothermal method and the composites with different morphologies are fabricated by adjusting the amount of NaOH in precursor solutions to control the growth of BiOIO 3 crystal plane. The physicochemical properties of BiOIO 3 /g-C 3 N 4 heterojunction composites were investigated by XRD, XPS, FTIR, SEM, TEM, HRTEM, BET, UV–vis DRS and PL characterization. The effect of the BiOIO 3 morphology on the photocatalytic efficiency of BiOIO 3 /g-C 3 N 4 heterojunction composites was evaluated by photocatalytic removal of gas-phase Hg 0 under visible light irradiation. When the morphology of BiOIO 3 is regular square-like, BiOIO 3 /g-C 3 N 4 has the optimal removal efficiency 92.6% of Hg 0 . Finally, electron-hole migration path and photocatalytic mechanism of catalysts are proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Lianke Zhang,Ruidan Zhang,Shuaishuai Zhang,Peng Sun
A composite photocatalyst KCN/LFO was synthesized using K-modified g-C 3 N 4 (KCN) and LaFeO 3 (LFO). The photocatalytic activity of the KCN/LFO was evaluated by degrading indole (heterocyclic organic compound). The KCN/LFO-10 (mass fraction of LaFeO 3 with 10%) displayed the highest removal rate of indole. Indole was degraded to 97.366% after 60 min. The photocurrent and electrochemical impedance spectroscopy (EIS) results suggested that the close correlation between KCN and LaFeO 3 can increasing the efficiency of photogenerated carrier separation. The capture experiment results demonstrated that ·O 2 − and ·OH is primary active substance, respectively. Moreover, the degradation efficiency of KCN/LFO-10 to indole remains stable at 87% after four successive experiments of indole photocatalytic degradation. This work presents an effective method for addressing the pollution caused by heterocyclic organic compound .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Zijun Zhong,Ruopeng Xu,Huijuan He,Qiuna Zhuang,Langhuan Huang
ABSTRACT A novel g-C 3 N 4 /MoS 2 heterojunction photocatalyst with high efficient visible-light-region was fabricated by a facile calcination method. The composite with various weight ratios of g-C 3 N 4 and MoS 2 was synthesized and characterized. The results showed that MoS 2 was uniformly distributed on the surface of g-C 3 N 4 , resulting in the formation of heterostructure. The photocatalyst showed excellent photocatalytic activity in the photodegradation of organic pollutants. The optimized g-C 3 N 4 /MoS 2 sample (10-CNM) exhibited 94% (Methylene Blue) degradation efficiency after being irradiated for 2 h under visible light. At last, the possible mechanism of the enhanced photocatalytic activity was discussed.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 32
·32466-32477
·
IF 2.8
Cui Peipei,Hu Yun,Zheng Mengmeng,Wei Chaohai
Graphitic-like carbon nitride (g-C 3 N 4 ) photocatalyst was synthesized by a facile chemical pyrolysis method, which was built on the self-condensation of different precursors to generate g-C 3 N 4 , e.g., melamine, urea, and thiocarbamide. And the different precursors produced a great influence on the photocatalytic activities of g-C 3 N 4 . Heterojunctions of g-C 3 N 4 and BiVO 4 were synthesized using a facile solvent evaporation method. The formation of BiVO 4 /g-C 3 N 4 composites were confirmed by XRD, FT-IR, SEM, XPS, and UV-Vis DRS. The photocatalytic activities for RhB degradation were evaluated under visible-light irradiation. The photocatalytic activity of g-C 3 N 4 prepared by urea was higher than that of g-C 3 N 4 prepared by melamine and thiocarbamide, which was attributed to its favorable dispersibility, larger specific surface area, and higher oxidation capacity. The heterojunction composites exhibited higher photocatalytic activity than pure g-C 3 N 4 or BiVO 4 . The results showed obvious removal efficiency for RhB, and the optimal sample with a BiVO 4 content of 10% exhibited higher efficiency than pure g-C 3 N 4 and BiVO 4 , and 10 wt%BiVO 4 /CN-U showed the highest photocatalytic activity. The enhanced photocatalytic activity of BiVO 4 /g-C 3 N 4 composite can be attributed to the intimate coupling between the two host substrates, resulting in an efficient charge separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NANO
·
2022
·
IF 1.438
Kaiyue Liang,Mingcai Yin,Yixian Li,Yaoting Fan,Zhongjun Li
CdS and MoS 2 are both promising photocatalytic materials for hydrogen production and lots of MoS 2 /CdS composites have been investigated. However, most of the previous work focused on relatively stable hexagonal CdS; researches on cubic CdS are still rare mainly due to its unstability. Then in this paper, a ternary composite MoS 2 /CN/CdS composed of cubic CdS, MoS 2 and graphitic carbon nitride (g-C 3 N 4 , abbreviated as CN) was prepared by simple in situ precipitation of cubic CdS on MoS 2 /CN at room temperature. Based on a series of characterizations, the photocatalytic hydrogen production performance of MoS 2 /CN/CdS was studied. The results showed that when the amount of MoS 2 /CN was 10 wt.%, the activity reached 1253.2 μ mol h − 1 , about 110 times that of pure CdS. Especially, its stability was investigated in detail by cyclic hydrogen production tests, which indicated that although the activity decreased after the first cycle, it was stable in the following three cycles mainly due to the existence of CN. Namely, a relatively stable and high performance cubic CdS-based ternary composite was achieved. This research can provide some new insights into the design of cubic CdS-based photocatalysts.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
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.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 17
·期 2
·217-225
·
IF 4.803
Xie Jiwei,Liu Guijing,Wang Kaikai,Li Xueming,Bai Yusen,Gao Shanmin,Fan Leqing,Zheng Rundou
Aqueous zinc-ion batteries are attracting considerable attention because of their high safety compared with conventional lithium-ion batteries. Manganese-based materials have been widely developed for zinc-ion batteries cathode owning to their low cost, high security and simple preparation. However, the severe volume expansion and poor stability during charging and discharging limit the further development of manganese-based cathodes. Herein, superior α -MnO 2 @g-C 3 N 4 was successfully prepared for stable zinc-ion batteries (ZIBs) cathode by introducing g-C 3 N 4 nanosheets. Compared with pure α -MnO 2 , α -MnO 2 @g-C 3 N 4 has a specific capacity of 298 mAh·g –1 at 0.1 A·g –1 . Even at 1 A·g –1 , the α -MnO 2 @g-C 3 N 4 still retains 100 mAh·g –1 (83.4% retention after 5000 cycles), implying its excellent cycling stability. The α -MnO 2 @g-C 3 N 4 -based cathode has the highest energy density (563 Wh·kg –1 ) and power energy density (2170 W·kg –1 ). This work provides new avenues for the development of a wider range of cathode materials for ZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2014
·Vol. 6
·期 12
·3419-3425
·
IF 5.044
Yongliang Liao,Shenmin Zhu,Jun Ma,Zhihua Sun,Chao Yin,Chengling Zhu,Xianghong Lou,Di Zhang
Graphical Shaping graphitic nitrides: Synthesis of graphitic carbon nitride (g-C 3 N 4 ) and tailoring of its morphology was performed through adjustment of the molar ratio of melamine to urea, their self-assembly by hydrogen bonding and ionic interactions, and calcination. We report a novel method for the preparation of graphitic carbon nitride (g-C 3 N 4 ) with various morphologies through self-assembly and calcination, which starts from the raw materials melamine, urea, and cyanuric acid. The hollow to wormlike morphologies of g-C 3 N 4 could be readily tailored by adjusting the molar ratio of melamine to urea; with increase in the molar ratio from 3:1 to 1:3, a morphology transformation was observed. The morphologies were tailored by self-assembly of the aggregates by hydrogen bonding and ionic interactions. Correspondingly, an increased BET surface area from 49.6 to 97.4 m 2 g −1 was observed. If used as a photocatalyst in degrading rhodamine B (RhB) under visible-light irradiation, these g-C 3 N 4 samples demonstrated 7 to 13 times higher performance than conventional bulk g-C 3 N 4 . The high performance was attributed to the unique morphology that provided not only high specific surface area but low recombination losses of photogenerated charges.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 2
·1271-1280
·
IF 1.798
Wang Wenwen,Yang Dongjiang,Yang Weiyou,Sun Jin,Hou Huilin
The wide application of the titanium dioxide (TiO 2 ) as the photocatalysts is greatly hindered by its intrinsic large band gap and usually fast electron–hole recombination. Here, we reported the exploration of coupling g-C 3 N 4 nanoflakes to TiO 2 nanotubes with the anatase and TiO 2 (B) mixed phases (TiO 2 (AB)) toward the efficient visible-light-driven hybrid photocatalyst. It is found that coupling TiO 2 (AB) nanotubes with g-C 3 N 4 nanoflakes could bring a profoundly extension the visible light adsorption capacity and enhanced photogenerated carrier separation. Accordingly, they exhibit much higher efficient photocatalytic activities toward the degradation of sulforhodamine B under the visible light irradiation, which is enhanced for nearly 15 times to those of the TiO 2 (AB) and g-C 3 N 4 , suggesting their promising practical applications as novel and efficient semiconductor photocatalysts for the water purification.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Xuelian Yu,Wenchao Yin,Tao Wang,Yihe Zhang
One of the major challenges associated with fuel cells is exploring highly efficient and low-cost electrocatalysts for the oxygen reduction reaction (ORR). Herein, the feasibility of using Ti3C2 MXene nanoparticles (NPs) to enhance the electrocatalytic activity of g-C3N4 for ORR was investigated. By varying the content of Ti3C2 NPs, a series of g-C3N4/Ti3C2 heterostructures were obtained, displaying enhanced electrocatalytic activity, including a positive shift in both onset and peak potentials toward ORR, compared to the original g-C3N4 in basic solution. We attribute the improvement to the favorable electrical conductivity of well-dispersed Ti3C2 MXene nanoparticles and also enhanced O2 adsorption due to the electronic coupling effect between g-C3N4 and Ti3C2 in the heterostructures. This work demonstrates the potential of earth-abundant MXene family materials to construct low-cost and high-performance electrocatalysts.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）