CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Huiping Zhao,Guangfang Li,Fan Tian,Qintao Jia,Yunling Liu,Rong Chen
To overcome the issue of UV-light response character of Bi 2 O 2 CO 3 due to its wide band gap, we primarily attempted to understand the possibility of improving the photocatalytic activity of Bi 2 O 2 CO 3 via g-C 3 N 4 surface-decoration by the theoretical calculation. Subsequently, g-C 3 N 4 surface-decorated Bi 2 O 2 CO 3 was successfully prepared via a facile hydrothermal method. It was found that the g-C 3 N 4 surface-decorated Bi 2 O 2 CO 3 samples exhibited enhanced activities for the photodegradation of tetracycline compared with pure Bi 2 O 2 CO 3 upon simulated solar light irradiation. Among them, the 10 wt% g-C 3 N 4 surface-decorated Bi 2 O 2 CO 3 sample showed the highest photocatalytic efficiency. First principle calculation and experimental data confirmed that the charge transfer at the interface between g-C 3 N 4 and Bi 2 O 2 CO 3 could significantly suppress the recombination of photo-generated electron-holes pairs, thus improving the photocatalytic performance. The proposed mechanism for the enhanced photocatalytic activity was also discussed. Moreover, the photodegradation of antibiotics over g-C 3 N 4 surface-decorated Bi 2 O 2 CO 3 was also performed in actual water matrix.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xianlong Zhang,Dong An,Dexin Feng,Fengbing Liang,Zhen Chen,Weimin Liu,Zhenzhen Yang,Mo Xian
Herein, in situ surfactant-free synthesis of ultrathin BiOCl/g-C 3 N 4 (BOC/CN) nanosheets for enhanced visible-light photodegradation of rhodamine B was described. The formation procedure, microstructural morphology, structure, optical properties , and photocatalytic activity were researched in detail. The results show that ultrathin BOC/CN heterojunctions nanosheets were successfully constructed via one-step surfactant-free solvothermal method by introducing CN into the synthesis system of BOC, and the thickness of BOC/CN nanosheets was ~3.5 nm. The ultrathin 2D/2D BOC/CN heterojunctions significantly enhanced the photodegradation of RhB dye under visible-light irradiation. The best-performing sample BOC/CN-60 had 3.9 and 12.8 times higher photocatalytic efficiency for visible-light RhB removal compared to pure BOC and CN, respectively. The large enhancement in the photodegradation activity should be attributed to the synergistic effect of BOC and CN in BOC/CN nanosheets. The synergism reflects in the widened optical window for effective light absorption , enlarged interfacial area for more efficient electron-hole separation, and a shorter diffusion distance for facilitated charge transfer. A possible visible-light RhB photodegradation mechanism was proposed, based on theoretical analysis and active species trapping experiments.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qiao Wang,Peng Xu,Guangshan Zhang,Limin Hu,Peng Wang
Visible-light responsive g-C 3 N 4 catalysts were successfully prepared by the calcination of urea, i.e., the thermal polycondensation method, and a series of ZnS/g-C 3 N 4 composite photocatalysts were then synthesized using a rapid microwave hydrothermal method . The physicochemical properties of the resulting g-C 3 N 4 and ZnS/g-C 3 N 4 catalysts were characterized via several microscopy and spectroscopy techniques . The reduction of Cr(VI) was used to evaluate the photocatalytic performance of the as-synthesized catalysts under visible light irradiation. The results showed that the calcination temperature substantially affected the crystallinity , specific surface area and photocatalytic performance of g-C 3 N 4 . The optimal temperature for thermal polycondensation in the g-C 3 N 4 synthesis was 600 °C. The bulk g-C 3 N 4 catalyst exhibited no Cr(VI) reduction ability, while a certain amount of ZnS nanoparticles coupling with g-C 3 N 4 significantly improved the Cr(VI) reduction efficiency, creating a synergistic effect between g-C 3 N 4 and ZnS. The simultaneous Cr(VI) reduction and rhodamine B decolorization by the ZnS/g-C 3 N 4 composite catalyst were also accomplished. In addition, a Cr(VI) reduction mechanism under visible light irradiation was proposed.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
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IF 3.261
Asif Hayat,Fazal Raziq,Muhammad Khan,Ikram Ullah,Mati Ur Rahman,Wasim Ullah Khan,Javid Khan,Akhlaq Ahmad
In this work, we report the fabrication of polypyrrole/g-C 3 N 4 (PPy/g-C 3 N 4 ) nanocomposites via simple wet-chemical method. The photocatalytic activities of the composites are evaluated for water splitting to evolve H 2 , Rhodamine B dye (RhB) and 2,4-dichlorophenol (2,4-DCP) degradation under visible-light. The results reveal that the photocatalytic performance of g-C 3 N 4 for H 2 evolution, RhB dye and 2, 4-DCP degradation are significantly improved after coupling polypyrrole (PPy). Worth noting, the amount optimized (1 wt%PPy/g-C 3 N 4 ) photocatalyst showed highest photoactivity compared to the other photocatalysts. Further, it is confirmed by means of radical trapping experiments that superoxide radical (O 2 − ) is the dominant specie involved in the degradation of pollutants over PPy/g-C 3 N 4 nano-composites. Moreover, clear photocatalytic reactions for H 2 evolution and pollutants degradation are proposed. This work would help us to deeply understand the reaction mechanism and will provide feasible routes to fabricate g-C 3 N 4 based highly efficient photocatalysts for energy and environmental applications.
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
Jiangping Jing,Zhuoyuan Chen,Chang Feng
Graphitic carbon nitride (g-C 3 N 4 ) usually shows amphoteric property in a neutral solution. In this work, a K&I co-doped g-C 3 N 4 is prepared by simply sintering the mixture of dicyandiamine, KI and I 2 . The K&I co-doping modulates the band structure of g-C 3 N 4 with pulling the Fermi level toward its conduction band minimum. The obtained K&I co-doped g-C 3 N 4 (K&I-C 3 N 4 ) generates positive photocurrents over the whole investigated potential range, exhibiting a typical n-type semiconductor characteristic. Therefore, the K&I co-doping transforms the g-C 3 N 4 from amphoteric to n-type semiconductor. Also, the prepared K&I-C 3 N 4 shows widened light absorption range and enhanced separation efficiency of the photogenerated charge carriers, which results in the dramatically enhanced photoelectrochemical performance.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Weixuan Zeng,Yuan Bian,Sheng Cao,Anquan Zhu,Lulu Qiao,Yongjin Ma,Pengfei Tan,Quanyin Ma,Rui Dong,Jun Pan
Visible light-driven photocatalytic hydrogen production has been deemed a potential means to solve the increasingly serious energy shortage problem. Herein, two dimensional (2D) Sr 2 Ta 2 O 7 /S-doped g-C 3 N 4 nanocomposites that applied in photocatalytic water reduction were fabricated through thermal condensation of thiourea with hydrothermal-prepared Sr 2 Ta 2 O 7 . The resulted Sr 2 Ta 2 O 7 /S-doped g-C 3 N 4 nanocomposite exhibited enhanced hydrogen evolution rate (11.36 μmol g −1 h −1 ) under visible light irradiation, which is about 3.5 times higher than that of pure S-doped g-C 3 N 4 . In light of the UV–vis diffuse reflectance spectroscopy, Mott-Schottky curve and photoluminescence spectra, the enhanced photocatalytic performance could be mainly attributed to the conduction band difference between Sr 2 Ta 2 O 7 and S-doped g-C 3 N 4 . In addition, transient photoluminescence spectra, electrochemical impedance spectra and photocurrent responses proved that the presence of Pt cocatalyst also plays an important role in facilitates the transport of photoexcited electron-hole pairs, subsequently promoting the photocatalytic performance.
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RSC Advances
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2019
·Vol. 9
·期 50
·29109-29119
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IF 3.049
Tao Wang,Manqi Huang,Xiawei Liu,Zhen Zhang,Yonghong Liu,Wei Tang,Shaopan Bao,Tao Fang
With the expansion of industrialization, dye pollution has become a significant hazard to humans and aquatic ecosystems. In this study, α-Fe2O3/g-C3N4-R (where R is the relative percentage of α-Fe2O3) composites were fabricated by a one-step method. The as-prepared α-Fe2O3/g-C3N4-0.5 composites showed excellent adsorption capacities for methyl orange (MO, 69.91 mg g−1) and methylene blue (MB, 29.46 mg g−1), surpassing those of g-C3N4 and many other materials. Moreover, the ionic strength and initial pH influenced the adsorption process. Relatively, the adsorption isotherms best fitted the Freundlich model, and the pseudo-second-order kinetic model could accurately describe the kinetics for the adsorption of MO and MB by α-Fe2O3/g-C3N4-0.5. Electrostatic interaction and π–π electron donor–acceptor interaction were the major mechanisms for MO/MB adsorption. In addition, the photocatalytic experiment results showed that more than 79% of the added MO/MB was removed within 150 min. The experimental results of free-radical capture revealed that holes (h+) were the major reaction species for the photodegradation of MO, whereas MB was reduced by the synergistic effect of hydroxyl radicals (·OH) and holes (h+). This study suggests that the α-Fe2O3/g-C3N4 composites have an application potential for the removal of dyes from wastewater.
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PubMed
高影响因子
POLYMER BULLETIN
·
2019
·Vol. 77
·期 7
·3795-3811
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IF 1.858
Wang Zhonghua,Zhou Wei,Zhu Liang
We investigated the adsorption of Cd 2+ and Pb 2+ using straw/bentonite-g-poly(acrylic acid- co -acrylamide) resin as an adsorbent in single and binary-component systems. The resin was characterized by various analytical techniques. Adsorption experiments were conducted by varying the pH, adsorbent dosage, initial concentration and temperature. Adsorption data for Cd 2+ and Pb 2+ fitted the Langmuir isotherm in the single-component system. Kinetic data for Cd 2+ and Pb 2+ followed the pseudo-second-order kinetic in a single-component system. A maximum adsorption for Cd 2+ occurred at pH 5, whereas for Pb 2+ , the maximum Cd 2+ adsorption occurred at pH 3. The maximum Cd 2+ and Pb 2+ adsorption capacities were 315.1 mg g −1 and 355.5 mg g −1 , respectively. In the binary-component system, the presence of Cd 2+ could improve the adsorption capacity of Pb 2+ and the presence of Pb 2+ could reduce the adsorption capacity of Cd 2+ when the Cd 2+ concentration was high. This study provides realistic and valid data on resin use to remove heavy metal ions from aqueous solutions.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Meiting Song,Yuhang Wu,Guopeng Zheng,Chunfang Du,Yiguo Su
Z -scheme g-C 3 N 4 /Au/BiVO 4 photocatalyst has been prepared successfully by assembling gold nanoparticles on the interface of super-thin porous g-C 3 N 4 and BiVO 4 , which exhibits outstanding photocatalytic performance toward hydrogen evolution and durable stability in the absence of cocatalyst. The highest photocatalytic hydrogen production rate of g-C 3 N 4 /Au/BiVO 4 was about 410.0 μmol g −1 h −1 , which largely beyond that obtained of g-C 3 N 4 /BiVO 4 (23.3 μmol g −1 h −1 ), Au/g-C 3 N 4 (244.6 μmol g −1 h −1 ) and pristine g-C 3 N 4 (2.2 μmol g −1 h −1 ). The optimal apparent quantum efficiency was counted to be 6.8% at λ = 420 nm and 1.1% at λ = 600 nm. Moreover, the photocatalytic property of g-C 3 N 4 /Au/BiVO 4 could remain unchanged almost with 50 h in 5 cycles. The improvement of photocatalytic H 2 yield is attributed to the result of rapid separation of photogenic carriers in space and surface plasmon resonance effect of Au nanoparticles. In combination of photoelectrochemical measurement, active species capture experiment and electron paramagnetic resonance spectra, the underlying mechanism was illuminated. The pathway of charge carrier migration between semiconductor photocatalysts could be changed to Z-system through Au as an electron intermediate, which could not only benefit to maintain outstanding redox capability but also help to accelerate photo-generated carrier separation, and thus improve the photocatalytic activity .
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Catalysis Science & Technology
·
2018
·Vol. 9
·期 1
·75-85
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IF 5.365
Ruyi Zhong,Zisheng Zhang,Shuqi Luo,Z. Conrad Zhang,Limin Huang,Meng Gu
Knowledge of the interfacial structure of nanocomposite materials is a prerequisite for rational design of nanostructured photocatalysts. Herein, TiO2 and g-C3N4 2D/2D nanocomposites were fabricated from three distinct synthetic protocols (i.e., co-calcination, solvothermal treatment and charge-induced aggregation), showing different degrees of enhancement (1.4–6.1 fold) in the visible-light induced photocatalytic hydrogen evolution reaction compared to the simple physical mixture. We propose that the interfacial Ti–O–N covalent bonding promotes the charge carrier transfer and separation more effectively than the electrostatic interaction, thus accelerating the photocatalytic H2 production. Meanwhile, the exposed surface area of TiO2 in the composite needs to be enlarged for deposition of the co-catalyst. This research sheds light on the rational design of hybrid nanocomposites based on earth-abundant elements for photocatalysis.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 24
·20580-20587
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IF 2.324
Fang Lu,Xue Yan,Hu Xing-Ming,Xie Dong,Li Wen-Jun
Electrochemiluminescence (ECL) is a very sensitive method for trace analysis because of its background interference and high signal-to-noise ratio. In the past decade, the determination of Cu 2+ in environment has attracted considerable attention since it plays an essential role in many physiological processes. Herein, a novel ECL sensor based on C,N quantum dots embedded g-C 3 N 4 nanosheets (C,N-QDs@NSs) was constructed for the detection of Cu 2+ . The nanocomposite was rapidly obtained via the oxidation of normal g-C 3 N 4 in H 2 O 2 solution using sonochemical synthesizing method. Due to the abundant surface defects on C,N-QDs@NSs, the ECL intensity was magnified 2.5 times for using a C,N-QDs@NSs electrode in comparision to a g-C 3 N 4 modified electrode. Besides, C,N-QDs@NSs could accelerate the rate of electron transfer in ECL reaction and thus resulted in the lower cathodic peak potential. Significantly, Cu 2+ could effectively quench the ECL of C,N-QD@NSs, which endowed C,N-QD@NSs with a great advantage in the ECL detection of Cu 2+ . under optimum conditions, C,N-QDs@NSs modified electrode exhibited a linear detection range from 5 × 10 −4 to 10 µM with a detection limit of 2 × 10 −4 µM (S/N = 3) for Cu 2+ , and was finally applied to detect Cu 2+ in real samples with satisfactory results.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Jiajia Feng,Dingke Zhang,Hongpeng Zhou,Mingyu Pi,Xiaodeng Wang,Shijian Chen
Fabricating heterostructures to promote the charge separation and doping heteroatom to modulate the band gap of the photocatalysts have been regarded as effective strategies to improve the photocatalytic performance. However, it is still an unresolved issue of doping element and fabricating heterostructures with good contact at the same time. In this study, P nanostructures/P doped graphitic carbon nitride composites (P@P-g-C3N4) were successfully composited by a solid reaction route. Various structural characterizations, including X-ray adsorption near edge structure, indicate that P has been doped into g-C3N4 and P nanostructures were directly grown on g-C3N4 to form heterostructures. As expected, the intimate contacted heterostructured composites exhibit much enhanced light absorption and high-efficiency transfer and separation of photogenerated electron–hole pairs, and consequently, the composites also possess the superior photocatalytic performance in the rapidly degrading RhB and an efficient H2 production rate of 941.80 μmolh–1g–1. Systematical studies combining experimental measurements with theoretical calculations were carried out to expound the underlying reasons behind the distinct performance. This study pave a one-step way to synthesize earth abundant element C, N, and P as novel photocatalysts for photochemical applications.
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