DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 10
·3486-3495
·
IF 4.052
Juying Lei,Bin Chen,Weijia Lv,Liang Zhou,Lingzhi Wang,Yongdi Liu,Jinlong Zhang
A TiO2/g-C3N4 composite photocatalyst with an inverse opal structure and heterojunction has been successfully prepared by a relatively facile approach. The catalyst was characterized by a combination of XRD, SEM, HRTEM, XPS, PL, EIS and DRS techniques and applied for the photocatalytic degradation of organic pollutants represented by Rhodamine B, phenol and levofloxacin. The results of RhB degradation showed that the rate constant of inverse opal TiO2/g-C3N4 with the best compound ratio is 0.184 min−1, which is 2.7 times faster than that of normal TiO2/g-C3N4 and 4.2 times faster than that of inverse opal TiO2. The enhancement of photocatalytic activity may be attributed to the matched overlapping band structure and the interaction between inverse opal g-C3N4 and TiO2. The inverse opal structure of g-C3N4 has improved the optical absorption properties of g-C3N4 and the interaction between inverse opal g-C3N4 and TiO2 creates more interfaces for the efficient transfer of photogenerated electron–hole pairs to restrict the recombination, which was proved from the photoluminescence spectra (PL). Moreover, a possible photocatalytic mechanism has been tentatively proposed according to the experimental results. All in all, both the inverse opal structure and heterojunction construction play significant roles in the excellent photocatalytic degradation performance according to the mechanism investigation.
研究领域:
材料科学
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环境科学
·
光催化
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Fei Guo,Dongsheng Li,Rui Ding,Jiaming Gao,Xuehua Ruan,Xiaobin Jiang,Gaohong He,Wu Xiao
Two-dimensional nanomaterials have the characteristics of high aspect ratio and high space utilization, which has huge potential advantages in gas separation. In this work, g-C 3 N 4 two-dimensional nanosheets with sieving pore structure were selected as templates and combined with ZIF-90 to construct a 0-dimensional/2-dimensional composite material ZIF-90@C 3 N 4 (ZCN). The complete two-dimensional g-C 3 N 4 nanosheets were stripped under acid etching conditions at 25 °C. ZIF-90 was distributed in an orderly manner on the two-dimensional nanosheets, and the nanosheets were spread out due to the growth of ZIF-90 to provide more free volume. The gas permeation experiment proved that the ZCN has a better CO 2 /N 2 separation performance. The ZCN/Pebax mixed matrix membrane (MMM) with the optimized 8.0 wt% ZCN loading showed an improved CO 2 permeability of 110.5 Barrer and a CO 2 /N 2 selectivity of 84.4, surpassing the Robeson upper bound (2008). The results demonstrated that the designed composite filler with 2D nanosheets is an effective strategy to enhance gas separation performance of MMMs and verified the application potential in gas purification industry.
研究领域:
材料科学
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化学工程
·
气体分离技术
✓ 已验证
DOI
高影响因子
Frontiers in Energy
·
2023
·Vol. 18
·期 1
·110-121
·
IF 2.9
Ge Yang,Shen Quanhao,Zhang Qi,Li Naixu,Lu Danchen,Zhang Zhaoming,Fu Zhiwei,Zhou Jiancheng
Metal-free graphitic carbon nitride (g-C 3 N 4 ) has captured significant attention as a low-cost and efficient hydrogen production photocatalyst through. Effectively regulating the microstructure and accelerating the separation of photogenerated carriers remain crucial strategies for promoting the photocatalytic performance of this material. Herein, a novel sulfur–carbon co-doped g-C 3 N 4 (SCCN) hierarchical microtubules filled with abundant nanosheets inside by thermal polymerization is reported. Numerous nanosheets create abundant pores and cavities inside the SCCN microtubes, thereby increasing the specific surface area of g-C 3 N 4 and providing sufficient reactant attachment sites. Besides, the hierarchical structure of SCCN microtubules strengthens the reflection and scattering of light, and the utilization of visible light is favorably affected. More importantly, co-doping S and C has greatly improved the photocatalytic performance of graphitic carbon nitride, optimized the band gap structure and enhanced the photogenerated carrier splitting. Consequently, the SCCN exhibits a remarkable photocatalytic H 2 evolution rate of 4868 µmol/(g·h). This work demonstrates the potential of multi-nonmetal doped g-C 3 N 4 as the ideal photocatalyst for H 2 evolution.
研究领域:
材料科学
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纳米技术
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催化
·
能量转换
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环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 42
·20146-20153
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IF 3.925
Zhengxing Gong,Jing Luo,Xinrong Shao,Xu Sun,Huan Wang,Dan Wu,Dawei Fan,Yuyang Li,Qin Wei,Huangxian Ju
A novel quenching electrochemiluminescence (ECL) immunosensor for the trace detection of neuron-specific enolase (NSE) was developed. Doping CdS with Zn2+ to obtain ZnCdS not only significantly improves the original properties of CdS, but also can be loaded onto the surface of g-C3N4 to form a special complex structure, which effectively improves the ECL performance of g-C3N4. Rh0.6Ru0.4 alloys with flower-like structures were prepared by simple hydrothermal synthesis, with excellent electrical conductivity and catalytic performance. Due to its special flower-like structure with a large specific surface area, Ag nanoparticles can be uniformly loaded on its surface to form Rh0.6Ru0.4@Ag composites. Through spectral comparison, it was found that Rh0.6Ru0.4@Ag has strong UV-vis absorption in the ECL emission wavelength range of g-C3N4, which can generate resonance energy transfer, thereby effectively quenching the ECL signal. The immunosensor has a wide detection range with a detection limit of 16 fg mL−1 (S/N = 3), good stability and biocompatibility, and has great potential in clinical application.
研究领域:
分析化学
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生物传感器
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生物医学工程
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材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xuliang Zhang,Shuangying Chen,Fushui Guo,Qiang Jing,Peipei Huo,Liu Feng,Fazhe Sun,Sakthivel Chandrasekar,Liantao Hao,Bo Liu
The synthesis of g-C 3 N 4 with a large specific surface area is highly desirable for developing g-C 3 N 4 -based photocatalysts with good activity. Herein, the specific surface area of g-C 3 N 4 was enlarged by preconditioning its raw material via a preassembly method, and the prepared g-C 3 N 4 , which has an enlarged specific surface area, exhibited a special maize-like structure. Interestingly, the specific surface area of this maize-like g-C 3 N 4 can be easily modulated by simply changing the amount of the special preconditioned precursor and the volume of the reaction cell used during the synthesis process, and the specific surface area can be enlarged to at least 224.11 m 2 /g. Several techniques, including transient-state photoluminescence spectroscopy, surface photovoltage response, and electrochemical measurements, confirmed that the charge separation property of g-C 3 N 4 is enhanced by enlarging its specific surface area, and it also exhibited increased photocatalytic degradation activities. This work provides a feasible strategy for designing high-performance g-C 3 N 4 -based photocatalytic systems.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-10
·
IF 3.578
Wang Shan,Fu Jing,Zhang Fang,Huan Ruirui,Liu Ting,Zeng Xingguo
Abstract A 0D/2D (0-dimensional/2-dimensional) nanostructure was designed by self-assembly of N–C QDs and carboxylated g-C 3 N 4 nanosheets and used as a fluorescence resonance energy transfer (FRET) fluorescent sensor. The N–C QDs/g-C 3 N 4 nanosheets were synthesized via the amino group on the N–C QD surface and the –COOH of the carboxylated g-C 3 N 4 nanosheets. The mechanism of detection of metronidazole (MNZ) by N–C QDs/g-C 3 N 4 nanocomposites is based on FRET between negatively charged N–QDs and positively charged carboxylated g-C 3 N 4 nanoparticles. N–C QDs/g-C 3 N 4 nanostructures displayed good responses for the detection of MNZ at normal temperature and pressure. The decrease in the fluorescence intensity showed a good linear relationship to MNZ concentration within 0–2.6 × 10 −5 mol/L, and the detection limit was 0.66 μM. The novel FRET sensor will have a great potential in clinical analysis and biological studies. Graphical Abstract
研究领域:
分析化学
·
生物医学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Jianhua Hou,Ting Jiang,Xiaozhi Wang,Geshan Zhang,Ji-Jun Zou,Chuanbao Cao
It is still challenging to adjust the desired structure and heterojunction interface of photocatalytic materials by a facile and efficient strategy. In this manuscript, variable dimensional structured BiOI with surface oxygen vacancies (OVs) were prepared via an in-situ growth on mesoporous g-C 3 N 4 nanosheets through one-pot synthesis at room temperature, which possesses the p-n heterojunction required for the high-performance photocatalysis . By reducing the amount of the precursor of BiOI during the reaction, the morphology of BiOI gradually changed from 3D microspheres to 2D nanosheets and even 0D nanoparticles , which were conjugated with ultrathin g-C 3 N 4 nanosheets forming the composites with 2D/3D, 2D/2D, and 2D/0D structure, respectively. The catalyst with the best performance was determined to be the g-C 3 N 4 /BiOI with 2D/2D structure, which provides a larger contact surface, appropriate bandgap, and the higher utilization of visible light. The synergies between heterostructure and OVs can promote both the production and the separation of electron-hole effectively, and hence producing more oxidizing • O 2 − and h + with the energy input. Thereby, under visible light, the optimized combination of g-C 3 N 4 /BiOI heterojunction can exhibit the outstanding photocatalytic performance of degrading 99% rhodamine B within 2 h, which was 2.6 and 12.8 times faster than pure g-C 3 N 4 and pure BiOI, respectively. In addition, our work provides a feasible and adjustable approach to regulate the structure and heterojunction interface of photocatalysts as well as the discussion about the variable dimensional structure-activity relationship in photocatalysis .
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 60
·54964-54975
·
IF 3.289
Jian Zeng,Ting Song,Meixiang Lv,Tingting Wang,Jiayi Qin,Heping Zeng
A Au/g-C3N4/NiFe2O4 nanocomposite was successfully prepared and characterized, and it exhibited a significant visible-light-driven photoactivity for hydrogen production. The results suggested that NiFe2O4 was closely coupled with flake-like g-C3N4 and Au nanoparticles were successfully loaded onto the surface of an optimal g-C3N4/NiFe2O4 nanocomposite. Subsequently, the photocatalytic hydrogen evolution of the as-prepared sample was investigated and optimized, indicating that the optimal Au/g-C3N4/NiFe2O4 ternary nanocomposite with AuNP loading of 1.0 wt% showed the highest hydrogen generation rate of 1.607 mmol g−1 h−1, which was 30.9 times and 28.7 times higher than the values of pure NiFe2O4 and pure g-C3N4, respectively, whereas the optimized g-C3N4/NiFe2O4 binary nanocomposite with NiFe2O4 coupled at 49.4% exhibited a hydrogen generation rate of 0.351 mmol g−1 h−1. Interestingly, the photocatalytic hydrogen production mechanism was also tentatively proposed as promoted charge carrier transfer and the strong surface plasmon resonance (SPR) effect of AuNPs via PL, EIS and photocurrent measurements was verified.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jia Yang,Rong Wang,Xiaorui Sun,Yan Li,Jian Liu,Xiaojun Kuang
The use of novel two-dimensional MXene materials and conventional g-C3N4 photocatalysts to fabricate the composites for hydrogen evolution reaction (HER) has attracted much attention, for which there is plenty of room for the enhancement of hydrogen evolution rates particularly under visible light and photostability. Herein, g-C3N4 was modified by copolymerization of malonamide and melamine and used to fabricate the ternary composites of Au particles and Ti3C2 MXene, and based on the synergistic effect, the composites enhanced the hydrogen evolution rates by 2.1, 99.8, and ∞ times compared with the unmodified g-C3N4 under UV, simulated sunlight, and visible light illumination, respectively. Moreover, the composite exhibited a sustained hydrogen evolution capacity in the cycle test for up to 120 h. Theoretical calculations and experimental results indicated that the hot electrons of Au are injected into the modified g-C3N4 and transferred to Ti3C2 simultaneously along with the photogenerated electrons of the modified g-C3N4 and then further transferred to Au, forming a photogenerated electron transfer channel of Au and modified g-C3N4 → Ti3C2 → Au within the composite. Ti3C2 acts as a bridge for fast separation of photogenerated electrons and holes on Au and modified g-C3N4, playing a key role in the enhanced photocatalytic performance. In addition, the visible light absorption ability of Au also positively contributed to the enhancement of visible light photocatalytic performance by providing hot electrons. Therefore, the selection of suitable cocatalysts for the design of composites is a crucial research direction to improve the photocatalytic performance and photostability of photocatalysts.
研究领域:
材料科学
·
光催化
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Jiafeng Ding,Gaoyuan Long,Yang Luo,Runze Sun,Mengxia Chen,Yajun Li,Yanfang Zhou,Xinhua Xu,Weirong Zhao
Polychlorinated dibenzo- p -dioxins (PCDDs), as a group of notorious anthropogenic environmental toxicants, are arguably ubiquitous in nature. In this study, we investigated the photocatalytic reductive dechlorination of 2-chlorodibenzo- p -dioxin (2-CDD) over Pd/g-C 3 N 4 catalysts under UV–vis irradiation. The g-C 3 N 4 and a series of Pd/g-C 3 N 4 catalysts were prepared by thermal polymerization and mechanical mixing-illumination method and characterized by XRD, TEM, BET, SEM and UV–vis DRS analyses. Among all the samples, the Pd/g-C 3 N 4 (5 wt%) yielded the optimal dechlorination activity with a total 2-CDD conversion of 54% within 4 h, and 76% of those converted 2-CDD were evolved to dibenzo- p -dioxin (DD). The kinetics of dechlorination could be described as pseudo-first-order decay model (R 2 > 0.84). Corresponding rate constants (k) increased from 0.052 to 0.17 h −1 with Pd contents up to 5 wt% and decreased to 0.13 h −1 with a 10 wt% of Pd. The enhanced activities originated from the surface plasmonic resonance (SPR) effect of Pd nanoparticles and the formation of Schottky barrier between Pd and g-C 3 N 4 , which extend the spectrum responsive range and suppress the charge recombination of g-C 3 N 4 . This is the first report on the photocatalytic reductive removal of PCDDs and may provide a new approach for PCDDs pollution control.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Functional Materials Letters
·
2021
·
IF 2.17
Dan Yang,Lei Zhao,Xueting Feng,Lili Ma,Hanming Ding
As a potential nonmetal activator of peroxymonosulfate (PMS), g -C 3 N 4 becomes a hot material owing to its superior chemical and physical properties. Nevertheless, pristine g -C 3 N 4 is unsatisfactory for PMS activation because of its limited photo-generated charge separation and low specific surface area. Herein, a porous sulfur-doped g -C 3 N 4 (S-doped g -C 3 N 4 ) has been prepared through a one-step calcination route without a template. The in - situ doping of sulfur element and the formation of porous morphology have been confirmed via various characterization methods. The catalytic activity of porous S-doped g -C 3 N 4 is approximately 6.2-fold higher than that of the pristine g -C 3 N 4 on rhodamine B (RhB) decomposition in aid of the photo-assisted PMS activation. The superior catalytic activity and high stability of the porous S-doped g -C 3 N 4 catalyst in a wide pH range are attributed to its higher specific surface area, enriched active sites, efficient photo-induced charge separation, and increased visible-light utilization. Meantime, a synergistic effect between the PMS activation process and the photocatalytic process is conducive to produce abundant radicals for the RhB degradation. This study offers new insight into further developing highly efficient nonmetal heterogeneous catalysts for wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Dawei Lan,Huiwen Zhu,Jianwen Zhang,Chengrui Xie,Fan Wang,Yueying Zheng,Zeyu Guo,Mengxia Xu,Tao Wu
This work provided a green, one-pot route to synthesize mesoporous g-C3N4. A series of characterizations revealed that the mesoporous sample maintained the typical structure of g-C3N4. The findings displayed that this mesoporous material had enlarged porosity and optical properties. The largest SBET of the mesoporous sample (32.65 m2/g) was 4.36 times larger than that of the bulk sample (7.48 m2/g). The photoactivity of the prepared photocatalysts was measured by the photocatalytic removal of rhodamine B (RhB). In agreement with the characterization analysis, the mesoporous g-C3N4 (99.60%) exhibited a 3.88 times better photocatalytic efficiency than that of bulk g-C3N4 (25.63%) and an 11.19 times faster reaction rate in the same period. In addition, the possible mechanism of this photodecomposition reaction was identified by the electron spin resonance (ESR) and trapping tests. The results demonstrated that •O2– and •OH made contributions, and •O2– played a dominant role in this process. This research offers a promising method for the synthesis of mesoporous g-C3N4 in an environmentally friendly and cost-effective route with remarkably high photoactivity.
研究领域:
环境化学
·
材料科学
·
光催化
·
纳米材料
·
环境功能材料
·
绿色合成
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）