Polymers
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2018
·Vol. 10
·期 10
·1118
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IF 2.935
Tianhao Jiang,Chaoqun Shang,Qingguo Meng,Mingliang Jin,Hua Liao,Ming Li,Zhihong Chen,Mingzhe Yuan,Xin Wang,Guofu Zhou
Herein, we synthesized BiOBr/ultrathin g-C3N4/ternary heterostructures modified with black phosphorous quantum dots using a simple water bath heating and sonication method. The ternary heterostructure was then used for the photocatalytic degradation of tetracycline in visible light, with an efficiency as high as 92% after 3 h of irradiation. Thus, the photodegradation efficiency is greatly improved compared to that of ultrathin g-C3N4, BiOBr, and black phosphorous quantum dots alone. The synthesized ternary heterostructure improves the charge separation efficiency, thus increasing the photodegradation efficiency. This work provides a new and efficient method for the degradation of antibiotics in the environment.Keywords:BiOBr;ultrathin g-C3N4;black phosphorous quantum dots;photodegradation;antibiotics
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
PHYSICA B-CONDENSED MATTER
·
2024
·
IF 2.8
Yongyi Li,Huixing Yang,Wei Li,Zhigang Shao,Yongzhuo Yu,Huixiang Yan,Shichao Jiao,Di Lin,Wenxu Zhang,Chaoyu Lv,Yuxin Huang
In this work, ultrathin lamellar g-C 3 N 4 /In 2 S 3 S-scheme heterojunctions doped with P were synthesized by urea recrystallization and investigated to see which ratio was more favorable for photocatalysis. The P doping formed a new Fermi energy level and reduced the forbidden bandwidth. The ultrathin lamellar structure facilitated rapid charge transfer, and the formation of S-scheme heterojunction, the presence of the interfacial electric field, and band bending effectively separated strong redox-capable electron-hole pairs, thus significantly improving the photocatalytic performance. Among the prepared materials, the 50UP-C 3 N 4 /In 2 S 3 photocatalyst with 50 % UP-C 3 N 4 mass fraction showed optimal photocatalytic H 2 production performance, with a hydrogen production rate of 12,387 μmol h −1 g −1 . Moreover, it showed good performance in photocatalytic degradation, with a degradation efficiency of up to 90.2 % of ofloxacin after 120 min of light exposure. This article provided a new perspective on the synthesis of other photocatalysts with carbazide-based S-scheme heterojunction structures.
研究领域:
材料科学
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光催化
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ruiming Fang,Zhongqing Yang,Zukhra C. Kadirova,Ziqiang He,Ziqi Wang,Jingyu Ran,Li Zhang
The visible-light photocatalytic reduction of CO 2 becomes a vital breakthrough to alleviate the greenhouse effect and achieve carbon neutrality. In this paper, ultrathin g-C 3 N 4 nanosheets of 1.74 nm were constructed, and K + was successfully doped between layers. The yields of CO and CH 4 are 1.65 μmol·g −1 ·h −1 and 0.15 μmol·g −1 ·h −1 , which are 4.70 and 7.27 times higher than the original g-C 3 N 4 , respectively. The ultra-thin nano-lamellar structure shortens the carrier transmission distance, and the intercalation of K + not only promotes the electron transport between g-C 3 N 4 layers but also changes the original hybrid mode of the catalytic system, thus shortening the band gap and adjusting the energy band structure. In addition, the CO 2 adsorption center of the K + intercalated g-C 3 N 4 is transferred from the coordinated carbon atom to the center of the triazine unit, and the binding energy is obviously increased, which strengthens the CO 2 adsorption. Finally, through in-situ DRIFT characterization, it is speculated that the reaction enhancement mechanism is that the modified catalyst promotes the adsorption and activation of CO 2 , resulting in the production of more intermediates, especially more hydrocarbon intermediates, which is more conducive to the photocatalytic reduction of CO 2 .
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
DALTON TRANSACTIONS
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2018
·Vol. 47
·期 20
·6924-6933
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IF 4.099
Fengliang Wang,Yingfei Wang,Yanyan Li,Xuhui Cui,Qianxin Zhang,Zhijie Xie,Haijin Liu,Yiping Feng,Wenying Lv,Guoguang Liu
Enabling the optimal usage of solar energy is considered to be one of the most pressing challenges in the photocatalytic remediation of water resident contaminants. Herein, a single-atom dispersed Ag loaded ultrathin g-C3N4 hybrid (AgTCM/UCN) was prepared through a facile co-polymerization of dicyandiamide with silver tricyanomethanide (AgTCM) and NH4Cl, and used as a visible light driven photocatalyst for the degradation of sulfamethazine (SMT) in the presence of peroxymonosulfate (PMS). Under UV light, visible light and simulated sunlight irradiation, the AgTCM/UCN/PMS process showed higher efficiency for SMT degradation than AgTCM/UCN, UCN/PMS, and g-C3N4/PMS systems. This enhanced photocatalytic activity may be attributed to the synergistic effects encompassing the surface plasmon resonance (SPR) of Ag, high surface area of UCN, and efficient charge separation of PMS. Electron–spin resonance (ESR) and reactive species (RSs) scavenger-quenching experiments revealed that SO4˙− was generated following the addition of PMS, whereas O2˙− and h+ were predominantly responsible for the degradation of SMT. Three degradation pathways of SMT were deduced, including the cleavage of sulfonamide bonds, SO2 extrusion, and the oxidation of the aniline moiety, based on mass spectrometry and theoretical calculations. The degradation of SMT in ambient water revealed that the AgTCM/UCN/PMS photocatalytic process can be efficaciously applied for the remediation of SMT contaminated natural waters, particularly sea water.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Yaru Shang,Tianxing Liu,Gang Chen,Yu Wang
In this study, nitrogen-doped carbon dots (NCDs) modified ultrathin carbon nitride (g-C 3 N 4 ) nanosheets were synthesized by a simple secondary calcination method, which realizes efficient photocatalytic hydrogen production . The secondary calcination process can not only thermally exfoliate g-C 3 N 4 into ultrathin nanosheets , but also uniformly anchor NCDs (∼3 nm) on the surface of g-C 3 N 4 . The photocatalytic results manifested that a very small amount of NCDs (0.5 wt%) loading on g-C 3 N 4 could achieve a high photocatalytic hydrogen production rate (5.21 mmol g −1 h −1 ). The reasons for the enhanced photocatalytic activity were analyzed. The ultrathin g-C 3 N 4 nanosheets facilitated the migration of photogenerated carriers . Moreover, NCDs/g-C 3 N 4 exhibited enhanced visible light absorption owing to the up-conversion fluorescence effect of NCDs and the narrow band gap caused by the decoration of NCDs. Furthermore, NCDs as electron acceptors can promote carrier separation. This combination strategy provides a basis for the synthesis of inexpensive, metal-free, and efficient carbon-based photocatalysts .
研究领域:
材料科学
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能源科学
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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 4
·2333-2341
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IF 3.108
Yanfang Yang,Jingjing Chen,Zhiyong Mao,Na An,Dajian Wang,Bradley D. Fahlman
Ultrathin graphitic carbon nitride (g-C3N4) nanosheets were synthesized via thermal exfoliation of bulk urea-derived g-C3N4 under an argon atmosphere. As a visible-light responsive photocatalyst, this material exhibits a much superior photocatalytic activity in pollution degradation and H2 evolution than bulk g-C3N4, as a result of the extended region of visible light response and the enhanced surface area of ultrathin g-C3N4 nanosheets. These findings may provide a promising and facile approach to the design of high-performance photocatalysts.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Junnan Wang,Minqiang Wang,Jindou Shi,Yun Zhou,Chen Zhang,Arshad Saleem Bhatti
Flexibility and self-cleaning are the main research hot-spots in the development of plasma substrates for practical applications in Surface-enhanced Raman scattering (SERS) at present. In this study, a flexible composite Au@Ag/ultrathin g-C 3 N 4 /Graphene (AUG) film based on PDMS film was reported and used as a highly sensitive SERS substrate for the detection of rhodamine 6G (R6G) molecules. The Au@Ag nanosphere array formed by self-assembly provided dense hot-spots, the ultrathin g-C 3 N 4 enabled the composite to possess excellent photocatalytic ability, and the graphene enhanced SERS detection and photocatalytic performance while improving the stability of the composite film . The results showed that the AUG flexible composite film had a detection limit of 10 −12 M for R6G molecules. After 10 photocatalytic cycles of testing, the composite film maintained 83 % of SERS activity. Benefiting from the graphene covering the surface, the composite films showed only a 5 % decrease in SERS detection performance after 30 days of storage in air. The facile fabrication process of AUG composite film enables it to be an outstanding candidate for the flexible, inexpensive, and stable wearable SERS sensing systems.
研究领域:
材料科学
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光催化
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分析化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jing Zou,Dongpeng Mao,Andrew Thye Shen Wee,Jizhou Jiang
Ultrathin (UT) g-C 3 N 4 with a thickness of ∼2 nm was prepared via a facile thermal exfoliation method using bulk g-C 3 N 4 as precursor. The UT-g-C 3 N 4 sample obtained exhibited a large specific surface area of 192.9 m 2 ·g −1 . The UT-g-C 3 N 4 /Ag hybrids were fabricated by a photo-assisted reduction technique. The morphology, microstructure and composition of the UT-g-C 3 N 4 /Ag hybrids were systematically characterized by transmission electron microscopy (TEM), aberration-corrected scanning transmission electron microscopy (STEM), STEM-energy dispersive X-ray (EDX) spectrometry, atomic force microscopy (AFM), X-ray diffraction (XRD) and X-ray photoelectron spectra (XPS). Based on electrochemical impedance spectroscopy (EIS) results, the optimal UT-g-C 3 N 4 /Ag hybrids displayed a faster electron transfer rate in comparison of UT-g-C 3 N 4 and bulk g-C 3 N 4 . Moreover, in the presence of a phosphate buffer solution (pH = 6.0), cyclic voltammetry (CV) and differential pulse voltammetry (DPV) results showed that the UT-g-C 3 N 4 /Ag hybrids coated on glassy carbon electrode (denoted as UT-g-C 3 N 4 /Ag/GCE) exhibited excellent electrochemical properties for l -tyrosine detection. It is observed that the electrochemical response of was linear in the concentration range of 1.00 × 10 −6 to 1.50 × 10 −4 mol L −1 with a limit of detection (S/N = 3) of 1.40 × 10 −7 mol L −1 , superior to the other reported sensors. The developed UT-g-C 3 N 4 /Ag/GCE sensor was employed for l -tyrosine detection in commercial l -tyrosine tablet samples, and the recovery of 97.2–99.3% was observed. This proposed g-C 3 N 4 -based electrochemical sensor provides a rapid and sensitive sensing method for l -tyrosine detection in real samples.
研究领域:
材料科学
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电化学
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生物传感器
·
分析化学
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产品关联
DOI
高影响因子
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