MATERIALS RESEARCH BULLETIN
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2024
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IF 5.3
Ruxue Ma,Han Zheng,Jing Wang,Xiucheng Zheng,Xiaoli Zhang,Xinxin Guan
Photocatalytic degradation is an effective and challenging strategy in purifying wastewaters containing organic pollutants. Thus, developing a suitable photocatalyst and clarifying the degradation mechanism are extremely worthwhile. In this work, Zn 2+ -decorated porous g-C 3 N 4 with nitrogen vacancies (g-C 3 N 4-δ ) is prepared with the facile sonication-calcination method. Benefitting from the modified geometric structure and electronic properties, compared with g-C 3 N 4-δ , the resulting composites deliver reduced micropore percentage, enhanced separation and migration of photogenerated carriers, narrowed band gap, and improved reducing capacity of photoinduced electrons, favoring the photocatalytic reaction. Particularly, Zn 2+ (2)-g-C 3 N 4-δ (10 mg) displays the highest photocatalytic activity toward eliminating tetracycline (TC, 10 mg L -1 , 50 mL), and the degradation efficiency (63.9%) within 30 min is 3.4 times that of g-C 3 N 4-δ (18.9%) irradiated by visible light. Moreover, the optimal composite demonstrates satisfactory recyclability and excellent universality. This study suggests a novel way to construct g-C 3 N 4 -based photocatalysts for efficiently degrading organic contaminants in water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2021
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IF 5.039
Yushuai Chen,Bo Yang,Wenyu Xie,Xueying Zhao,Zhuan Wang,Xintai Su,Chao Yang
Insufficient active sites and fast charge carrier recombination are detrimental to photocatalytic activity of graphitic carbon nitride (g-C 3 N 4 ). In this work, a combination of pore creating with thermal exfoliation was employed to prepare porous g-C 3 N 4 nanosheets for photocatalytic water splitting into hydrogen. Hexadecyl trimethyl ammonium chloride (CTAC) as the soft template promoted the formation of porous g-C 3 N 4 during the thermal condensation of melamine. On further post-synthesis calcination, the porous g-C 3 N 4 aggregates were exfoliated into discrete nanosheets, accompanied by an increase in specific surface area and defects. Optimal porous g-C 3 N 4 nanosheets achieved 3.6 times the photocatalytic hydrogen evolution rate for bulk counterpart. The enhanced photocatalytic activity may be ascribed to TCN-1%CTAC has larger specific surface area, stronger optical absorption intensity and higher photogenerated electron–hole separation efficiency. The external quantum efficiency of TCN-1%CTAC was measured to be 3.4% at 420 nm. This work provides a simple combinatorial strategy for the preparation of porous g-C 3 N 4 nanosheets with low cost, environmental friendliness and enhanced photocatalytic activity.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 2
·1082-1091
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IF 3.591
Yunqi Wang,Zhixiang Liu,Xu Tang,Pengwei Huo,Zhi Zhu,Boting Yang,Zhi Liu
In-depth research of the active sites and charge transport behavior is an important topic for investigating photocatalytic reduction of CO2. Herein, a novel photocatalyst composed of flake-like porous graphitic carbon nitride (P-CN) and CsPbBr3 is fabricated via a high temperature calcination and freeze drying method. The experimental results show that P-CN/CsPbBr3 has a superior CO2 reduction efficiency, and that the yield of CO reaches 30.39 μmol g−1, which is about 7.2 and 1.2 times higher than those of the primary B-CN (4.2 μmol g−1) and CsPbBr3 (24.4 μmol g−1), respectively. The improvement in photocatalytic performance is mainly ascribed to the heterostructure, which can promote the separation of photogenerated carriers, and the porous structure of P-CN, which can improve the absorption capacity of CO2. This study provides a significant method for the construction of efficient g-C3N4 based photocatalysts to reduce CO2.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2023
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IF 5.9
Ya Lu,Zhuanfang Bi,Guangyi Shang
Fluorene, as one of the important organic compounds widely used in the field of medicine and photoelectric materials, could damage human health even if it is extremely low in the environment. The development of ultrasensitive and easy-recyclable surface-enhanced Raman scattering (SERS) detection of trace fluorene is highly desired. In this work, a nanocomposite of Ag nanoparticles (Ag NPs) and porous g-C3N4 is synthesized by a facile method. The advantageous features of the as-prepared nanocomposite include a high SERS sensitivity due to the plasmonic effect of the Ag NPs, excellent recyclability due to the self-cleaning ability originating from the photocatalytic degradation of porous g-C3N4 under visible light irradiation, and good adsorption due to the large specific surface area of porous g-C3N4. The experimental results show that an ultralow detection limit of 1.35 × 10–13 M for R6G can be achieved. Especially, the nanocomposite exhibits excellent performance for the detection of fluorene with the detection limit of 3.11 × 10–11 M and multidetection of at least 13 cycles. The present research provides a nanocomposite with excellent synergistic activity of plasmonic enhancement and photocatalytic degradation for the recyclable SERS detection of trace fluorene.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
CARBON
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2021
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IF 9.594
Xiaocui Wu,Qingshan Zhao,Fang Guo,Guangsen Xia,Xiaojie Tan,Huiyuan Lv,Zhaoxuan Feng,Wenting Wu,Jingtang Zheng,Mingbo Wu
Merging photocatalysis with Fenton-like reaction provides a promising synergetic advanced oxidation technology for water treatment, whereas the rational design of efficient cooperative photo-Fenton system still remains a great challenge. In this study, a ternary α-FeOOH/carbon dots/porous g-C 3 N 4 (α-FeOOH/CDs/p-GCN) composite is developed as visible-light-driven heterogeneous photo-Fenton catalyst for contaminated water remediation. α-FeOOH nanorods are in-situ grown on porous g-C 3 N 4 substrates, among which CDs are intercalated as high-speed electron transmission bridges, simultaneously preventing the photogenerated electron-hole recombination and accelerating the Fe 3+ /Fe 2+ redox cycle. The distinctive heterostructure and synergetic catalytic effect endow α-FeOOH/CDs/p-GCN with superior efficiency, reusability , and universality for recalcitrant pollutant elimination, the reaction rate of which is nearly 13.6, 7.3, 3.4, 1.4, and 5.1 times higher than that of α-FeOOH, bulk g-C 3 N 4 (b-GCN), p-GCN, α-FeOOH/p-GCN, and α-FeOOH/CDs/b-GCN, respectively. The FeOOH/CDs/p-GCN also demonstrates excellent tolerance to realistic environmental matrices including deionized water, sea water, river water, wastewater, and underground water. HO• and •O 2 − radicals are proved to be the predominant contributors in the photo-Fenton system. This work provides an efficient synergetic visible-light-driven photo-Fenton catalyst possessing great potential for practical contaminated water remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2017
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IF 2.813
Zhenxing Zeng,Kexin Li,Kai Wei,Yuhua Dai,Liushui Yan,Huiqin Guo,Xubiao Luo
A series of highly dispersed platinum-deposited porous g-C 3 N 4 (Pt/pg-C 3 N 4 ) were successfully fabricated by a simple in situ photoreduction strategy using chloroplatinic acid and porous g-C 3 N 4 as precursors. Porous g-C 3 N 4 was fabricated by a pretreatment strategy using melamine as a raw material. The morphology, porosity, phase, chemical structure, and optical and electronic properties of as-prepared Pt/pg-C 3 N 4 were characterized. The photocatalytic activity of as-prepared Pt/pg-C 3 N 4 was preliminarily evaluated by the degradation of aqueous azo dyes methyl orange under visible light irradiation. The as-prepared Pt/pg-C 3 N 4 were further applied to the degradation and mineralization of aqueous 4-fluorophenol. The recyclability of Pt/pg-C 3 N 4 was evaluated under four consecutive photocatalytic runs.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
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2023
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IF 4.1
Shixian Zhang,Xinshan Rong,Ting Sun,Ping Gao,Jun Liu,Xuchun Qiu,Xiangtong Zhou,Zhiren Wu
With the increasingly severe environmental problems the traditional high pollution and high energy consumption of nitrogen fixation industry is striving to develop new cleaner production technology. In this work, we designed and prepared the 3D porous g-C 3 N 4 with nitrogen vacancy (3DV N PCN) through a combination of alkali-assisted and supramolecular self-assembly methods. Subsequently, we synthesized, characterized and employed a Z -scheme 3DV N PCN/CoFe 2 O 4 photocatalyst with strong nitrogen adsorption and activation for nitrogen photofixation. The results show that the best photofixation nitrogen efficiency of the photocatalyst can reach 14.66 mmol/g/h within 120 min. This nitrogen fixation process carried out at room temperature, and only requires water and nitrogen as raw materials, which has the advantage of being energy efficient, environmental friendly and pollution-free.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Xia Zhou,Shuilai Qiu,Jiajia Liu,Mutian Zhou,Wei Cai,Junling Wang,Fukai Chu,Weiyi Xing,Lei Song,Yuan Hu
It's acknowledged that the inferior toughness of bismaleimide resin (BMI) is the crucial problem hindering its development and application especially in aerospace, mechanical and electronic fields. While the poor fire safety of toughened BMI is another problem urgently needed to be resolved. Therefore a novel g-C 3 N 4 @PPZ hierarchical architecture constituted of porous g-C 3 N 4 tubes modified by polyphosphazene was designed and fabricated to improve the fire safety and mechanical properties of BMI in this work. Especially compared to pure BMI, the peak heat release rate (PHRR) and peak smoke production rate (PSPR) of BMI with an incorporation of 2 wt% g-C 3 N 4 @PPZ (BMI/g-C 3 N 4 @PPZ2.0) are at 246.3 kW/m 2 and 0.12 m 2 /s accompanying with 52.1% and 53.8% reduction respectively. The total heat release (THR) and total smoke production (TSP) of BMI/g-C 3 N 4 @PPZ2.0 are endowed with reductions of 29.4% and 42.9% as well, which demonstrates that the fire safety including heat and smoke hazards of BMI/g-C 3 N 4 @PPZ2.0 is significantly improved. With regard to the mechanical performance of BMI composites, the impact strength of BMI/g-C 3 N 4 @PPZ1.5 is 18.89 kJ/m 2 which increases by 184.0% in comparison with that of pure BMI resin (6.65 kJ/m 2 ). And it’s found that the impact strength of BMI/g-C 3 N 4 @PPZ are still higher than pure BMI in hot-humid environment, which signifies that the BMI/g-C 3 N 4 @PPZ would be preferred in the industrial applications. Meantime the possible flame retardant and toughening mechanism of g-C 3 N 4 @PPZ in BMI is detailed investigated and proposed as well.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Puhui Deng,Weisong Hong,Zhiwei Cheng,Linping Zhang,Yu Hou
Ni/porous g-C 3 N 4 was prepared by high temperature thermal polymerization process using carbon dots as soft template and photodeposition. With nickel nanoparticles supported as co-catalyst, the hydrogen evolution reaction (HER) activity of the photocatalyst has been significantly enhanced under visible light, which is up to 1273.58 μmol g −1 h −1 , superior to pristine g-C 3 N 4 (4.12 μmol g −1 h −1 ). This is attributed to the inhibited recombination of photogenerated electron-hole pairs and the much better electron transport efficiency. The formed porous structure of carbon nitride could facilitate light utilization and together with nickel nanoparticles, better charge separation can be realized which are proved by the photoluminescence , time-resolved photoluminescence spectra , transient photocurrent measurements and electrochemical impendence spectroscopy. This work provides a useful route to obtain less expensive and efficient photocatalyst containing no noble metals for hydrogen production .
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 13
·8915-8922
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IF 3.9
Tong Zhou,Haitang Wei,Bin Xiao,Tianping Lv,Liangfei Duan,Qingjie Lu,Jin Zhang,Yumin Zhang,Qingju Liu
One of the most promising strategies for producing hydrogen is photocatalytic water splitting, in which the photocatalyst is a key component. Among many semiconductor photocatalysts, g-C3N4 has attracted great attention due to its narrow band gap, excellent stability and low cost. However, practical application is limited by its poor intrinsic activity. In this work, a high-performance porous g-C3N4 (PCN) photocatalyst with anchored Cu single atoms (CuSAs) was synthesized by a one-step co-heating approach. The obtained Cu1.5–PCN displays an excellent hydrogen evolution rate (HER) of 2142.4 μmol h−1 g−1 under visible light (=420 nm), which is around 15 and 109 times higher than those of PCN and bulk g-C3N4, respectively. In addition, it also shows good stability during H2 evolution. The results of experimental research and DFT simulations indicate that the single Cu ions formed bonds with the N-ring and these remain stable. Meanwhile, the special electronic structure of the Cu–N charge bridge extends the light absorption band to the visible-light region (380–700 nm). This high-performance and low-cost photocatalyst has great potential in solar energy conversion.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
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IF 6.7
Lanyu Qi,Guofeng Ma,Ronghui Kou,Ziyao Wang,Hongling Zhang,Yanhong Yang
The Fenton-like process is a highly efficient and widely applied advanced oxidation technology for degrading organic pollutants under dark conditions. However, its development is limited by low H 2 O 2 utilization, incomplete mineralization, and limited optimal pH range. We developed a CoAl-LDH/porous g-C 3 N 4 catalyst via high-temperature thermal polymerization with NH 4 HCO 3 as a dynamic gas template and urea as a precursor. The reaction rate constant of CoAl-LDH/porous g-C 3 N 4 -H 2 O 2 system for degradation of Rhodamine B is 0.0199 min −1 , which is about 1.58 times that of the CoAl-LDH-H 2 O 2 system. Moreover, the catalyst sustained performance over four cycles and maintained high activity in degrading three different substrates. The high catalytic activity is attributed to the rich porous structure of g-C 3 N 4 , the presence of abundant active sites, and the synergistic interaction between the CoAl-LDH and g-C 3 N 4 , which promotes the generation of ·OH, 1 O 2 , ·O 2 − , facilitating pollutant degradation. This study highlights the potential of this CoAl-LDH/porous g-C 3 N 4 -based Fenton-like system for applications in dye wastewater treatment.
研究领域:
环境科学
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催化材料
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废水处理
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Yong-Ting Li,Xiao-Li Zhang,Zhi-Kun Peng,Pu Liu,Xiu-Cheng Zheng
It is a crucial and urgent task to develop high performance catalysts for the hydrolysis of ammonia borane (NH3BH3, AB), which is presently thought to be an effective strategy for hydrogen generation. In this work, we immobilize the ultrafine RuNi alloy nanoparticles in the network of hierarchical porous g-C3N4 thin sheets with a facile adsorption–in situ reduction method. The structural and physicochemical properties of the as-prepared catalysts are studied using various techniques. The influence of different molar ratios of Ru to Ni in the catalysts on the hydrolytic dehydrogenation rate of AB is investigated to optimize the best one. The detailed reaction kinetics and the enhancing effect of NaOH with different dosages on the hydrolysis rate are studied through a series of experiments. Catalyzed by the optimal catalysts (denoted as Ru0.5Ni0.5/p-g-C3N4), the hydrolysis reaction is first-order and near zero-order relative to the Ru and AB concentrations, respectively. The corresponding turnover frequency reaches 840.3 min–1, and the apparent activation energy is as low as 14.1 kJ mol–1, which are greatly superior to many similar or counterpart catalysts previously reported. The results indicate the potential of the bimetallic alloy catalysts for the hydrolytic dehydrogenation of hydrogen storage materials.
研究领域:
材料科学
·
能源化学
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催化反应
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）