Polymers
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2018
·Vol. 10
·期 10
·1118
·
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
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Jing Zhang,Ning Gao,Fulong Chen,Tao Zhang,Guilong Zhang,Dongfang Wang,Xingyong Xie,Dongqing Cai,Xijun Ma,Lifang Wu,Zhengyan Wu
In this paper, we firstly used the inorganic nano-network of palygorskite (IPAL) with multiporous structure fabricated from rigid nano-rods by ion beam bombardment to enhance the photoactivity of the graphitic carbon nitride (CN). Results of spectroscopy techniques show that the as-prepared sample (IPAL/CN) displays broader light absorption in the visible light region and low recombination of charge carriers. Photocatalytic illustrations of Cr (VI) (and methylene blue (MB)) in aqueous solution by IPAL/CN samples were investigated respectively. Results show that the IPAL/CN-1:6 composites exhibit a superior catalytic activity with 99.5% of Cr (VI) and 99.2% of MB removal efficiency in 100 min, which were almost 7.0 times and 9.5 times higher than that of pure CN, respectively. After four cycles, the IPAL/CN-1:6 exhibits great photoactivity. Moreover, the reaction can be conducted better under the low pH value of the solution, and the initial concentration can influence the reaction property. The theory of DLVO and zeta potential were used to analyze the dispersion effect on the samples. The higher photoactivity of the IPAL/CN samples could be attributed not only to the high adsorption capacity but also to the improved dispersion affected by the nano-network of IPAL. This study provides a new opportunity for the modification of photocatalyst by the inorganic nanomaterials formed easily by physical irradiation.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
·
IF 2.891
Kedir Ebrahim Ahmed,Dong-Hau Kuo,Misganaw Alemu Zeleke,Osman Ahmed Zelekew,Angaw Kelemework Abay
Sn-WO 3 /g-C 3 N 4 composites were synthesized by calcination method. The materials were characterized with different techniques and photocatalytic activities examined by the degradation of anionic methyl orange (MO) and cationic Rhodamine B (RhB) under visible light. 8% Sn-WO 3 /g-C 3 N 4 showed superior degradation efficiency with 87% MO and 99% RhB dye removal within 120 and 50 min of irradiation time, respectively. X-ray photoelectron spectroscopy (XPS) analysis reveals molecular oxygen adsorption on the surface of the as-prepared composite material. The introduction of tin in Sn-WO 3 solid solution with a high atomic Sn:W ratio of 1:2 and the construction of interfacial hetrojunction with graphitic carbon nitride (g-C 3 N 4 ) plays a vital role to enhance the photocatalytic activity of the as-prepared composites by activating oxygen to react with dye molecules.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Shan Wang
A novel fluorescence probe was built by using graphitic carbon nitride (g-C 3 N 4 ) nanosheets . Fluorescence of the g-C 3 N 4 nanosheet solution was effectively quenched by Fe 3+ via photoinduced electron transfer (PET). Moreover, the linear detection range for Fe 3+ was 0–43.33 nM with a limit of detection of 4 nM. Fluorescence recovery of g-C 3 N 4 was observed upon addition of ascorbic acid (AA) to the g-C 3 N 4 nanosheet–Fe 3+ system, and the paramagnetic Fe 3+ was reduced to diamagnetic Fe 2+ by blocking PET. An “on–off–on” fluorescence response was observed through the oxidation–reduction between Fe 3+ and AA. Furthermore, a wide linear detection range for AA was found in 0–26.67 nM. Thus, this system can play a dual role in the selective and sensitive detection of Fe 3+ and AA in aqueous media via “on–off–on” fluorescence response.
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Nanoscale
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2013
·Vol. 6
·期 5
·2649-2659
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IF 6.233
Liming Sun,Yue Qi,Chun-Jiang Jia,Zhao Jin,Weiliu Fan
Fabricating heterojunction photocatalysts is an important strategy for speeding up the separation rate of photogenerated charge carriers, which is attracting greater interest. However, the choice of three factors, individual materials, band offsets, and effective interfaces, is still important for fabricating efficient heterojunction photocatalysts. Herein, efficient g-C3N4/Zn2GeO4 photocatalysts with effective interfaces were designed by controlling the surface charges of the two individual materials inside the same aqueous dispersion medium, making use of the electrostatic attraction between oppositely charged particles. The g-C3N4/Zn2GeO4 heterojunction with opposite surface charge (OSC) showed higher visible-light photocatalytic activity for degradation of methylene blue than those of pure g-C3N4, pure Zn2GeO4, and the g-C3N4/Zn2GeO4 with identical surface charge (ISC). The investigation of the light absorption spectrum, adsorption ability, and photocurrent responses revealed that the improved separation of photogenerated carriers was the main reason for the enhancement of the OSC g-C3N4/Zn2GeO4 sample's photocatalytic activity. By combining with theoretical calculations, we investigated the microscopic mechanisms of interface interaction and charge transfer between g-C3N4 and Zn2GeO4. The photogenerated electrons in the g-C3N4 N 2p states directly excited into the Zn 4s and Ge 4s hybrid states of Zn2GeO4. The strategy of designing and preparing a g-C3N4/Zn2GeO4 composite catalyst in this work is very useful for fabricating other efficient heterojunction photocatalysts.
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APPLIED SURFACE SCIENCE
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2015
·
IF 2.711
Ming Wu,Jun-Min Yan,Xue-wei Zhang,Ming Zhao
The g -C 3 N 4 is synthesized by directly heating the acetic acid treatment melamine. A combination of XRD, SEM, TEM, PL and UV–vis are utilized to characterize the composition, morphology and optical properties of g -C 3 N 4 . This method synthesized g -C 3 N 4 shows smaller particles and some holes which high up the photocatalytic activity compared with the bulk g -C 3 N 4 .
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RSC Advances
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2015
·Vol. 5
·期 19
·14074-14080
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IF 3.84
Yuangang Li,Xiaoliang Wei,Huajing Li,Rongrong Wang,Juan Feng,Hui Yun,Anning Zhou
Novel nanoarrays composed of inorganic–organic CdS@g-C3N4 core–shell nanorods were fabricated via a simple hydrothermal treatment and heating process. The samples were characterized by XRD, FESEM, TEM, XPS, FTIR, UV-vis and photoelectrochemical (PEC) measurements. We find that both PEC performance and stability against light illumination of the CdS@g-C3N4 CSNRs are significantly enhanced compared with pure CdS NRs. The photocurrent density of the CdS@g-C3N4 CSNRs reaches up to 1.16 mA cm−2, which is 2.5 times higher than that of pure CdS NRs under the same conditions. More importantly, after 3600 s continuous illumination, the CdS@g-C3N4 CSNRs are quite stable and more than 85% of the initial photocurrent is sustained, while the photocurrent of CdS NRs decays to 20% of the initial value. Finally, a possible mechanism for the enhanced PEC performance and stability of the CdS@g-C3N4 CSNRs heterostructure is proposed and discussed systematically based on our experimental results.
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SENSORS AND ACTUATORS B-CHEMICAL
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2015
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IF 4.097
Lin Wu,Yuhong Sha,Wenrou Li,Sui Wang,Zhiyong Guo,Jun Zhou,Xiurong Su,Xiaohua Jiang
A novel, disposable and label-free electrochemiluminescence (ECL) immunosensor, based on multi-functionalized graphitic carbon nitride (g-C 3 N 4 ) coated on the one-off screen-printed carbon electrodes (SPCEs), for the detection of tumor marker carbohydrate antigen 125 (CA125) was developed. The multi-functionalized g-C 3 N 4 was prepared with amino-coated Fe 3 O 4 nanoparticles and CA125 antibody (anti-CA125) chemically bound to the surface of carboxylated g-C 3 N 4 simultaneously. The Fe 3 O 4 nanoparticles ensured the presence of multi-functionalized g-C 3 N 4 in the outer Helmholtz plane (OHP) of the ECL immunosensor and even becoming part of the electrode surface. This assembly promoted the electron transfer between g-C 3 N 4 and the electrode resulting in greatly enhanced ECL intensity. The CA125 was selectively captured by anti-CA125 leading to effective inhibition of the ECL signal. Under optimal conditions, this disposable ECL immunosensor exhibited a wide dynamic linear detection range for CA125 (0.001–5 U/mL) with a lower detection limit of 0.4 mU/mL, providing high sensitivity. In addition, the immunosensor also exhibited high specificity, good reproducibility and long-term stability. All these properties offer great promise for rapid, simple, selective and effective detection of CA125 in clinical applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
·
IF 7.435
Zhi Zhu,Ziyang Lu,Dandan Wang,Xu Tang,Yongsheng Yan,Weidong Shi,Youshan Wang,Nailing Gao,Xin Yao,Hongjun Dong
A high-dispersed Ag/Fe 3 O 4 /g-C 3 N 4 composite photocatalyst is firstly synthesized by means of the selective photo-deposition technique. It exhibits the obvious improvement of photocatalytic activity and stability for degrading tetracycline besides retaining the recycled magnetic property. The enhanced photocatalytic activity originates from synergetic effect of Ag, Fe 3 O 4 and g-C 3 N 4 that improves light absorption capacity and separation efficiency of charge carriers. This work provides a promising approach to develop visible-light-response and recycled photocatalysts applied to antibiotic wastewater treatment .
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 43
·29354-29362
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IF 4.493
Xia Cui,Yi Fan Zheng,Hao Yong Yin,Xu Chun Song
In this study, C3N4/Zn1−xCdxS (0 ≤ x ≤ 1) heterostructures with adjustment of the band gap were successfully prepared by calcination and a hydrothermal synthesis method. The photocatalytic properties of C3N4/Zn1−xCdxS composite photocatalysts were evaluated by the photocatalytic degradation of RhB under visible light irradiation. The results showed that the combination of the two semiconductor photocatalysts (C3N4 and Zn1−xCdxS) greatly enhanced the photocatalytic degradation efficiency of RhB compared to the pure C3N4 and Zn1−xCdxS under visible light irradiation. Among them, the 0.1C3N4/Zn0.8Cd0.2S composite photocatalyst exhibited the highest photocatalytic activities with the degradation efficiency of RhB arriving to 97.9% within 90 min. The remarkable photocatalytic activity of the 0.1C3N4/Zn0.8Cd0.2S composite photocatalyst was mainly attributed to the appropriate band structure and the effective separation of photogenerated electron–hole pairs. Additionally, a possible basic mechanism of the composite semiconductor photocatalytic process was also discussed. Moreover, it was also investigated that O2˙− and h+ were the main reactive oxidative species in this photocatalytic process of the degradation of RhB on the 0.1C3N4/Zn0.8Cd0.2S heterostructure photocatalyst.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Ruirui Hao,Guohong Wang,Hua Tang,Lingling Sun,Chang Xu,Deyan Han
Mesoporous photocatalytic materials with macroporous structures have attracted more and more attention because of their textural mesopores and intrinsic interconnected pore networks, which are able to efficiently transport guest species to framework binding sites. In this work, macro/mesoporous g-C 3 N 4 /TiO 2 heterojunction photocatalysts were fabricated without templates or additives by a facile calcination method using tetrabutyl titanate and melamine as the feedstocks. Photocatalytic experiments of the as-prepared samples were measured by the photocatalytic oxidation degradation of RhB solution at room temperature under visible light irradiation. The results indicated that the melamine content in the precursors had an important influence on photocatalytic activity of the as-prepared samples. At the optimal loading content, the apparent reaction rate constant ( k ) was 47.8 × 10 −3 min −1 for RhB degradation, exceeding that of pure TiO 2 (6.6 × 10 −3 min −1 ) and g-C 3 N 4 (15.2 × 10 −3 min −1 ) by factor of 7.2 and 3.1 respectively. The improved photocatalytic activity was attributed to high surface area and heterostructure formation of g-C 3 N 4 /TiO 2 composites. The trapping experiment results showed that O 2 − and h + were main active species in the decomposition of RhB. A possible enhanced photocatalytic mechanism of g-C 3 N 4 /TiO 2 heterojunction photocatalysts was proposed.
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JOURNAL OF FLUORESCENCE
·
2016
·Vol. 26
·期 2
·739-744
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IF 1.601
Cao Yujuan,Wu Wei,Wang Song,Peng Hong,Hu Xiaogang,Yu Ying
Rapid and sensitive detection of heavy-metal ions in natural water environments worldwide is urgently needed because of their severe threats to human health. In the present work, monolayer graphite-like flake C 3 N 4 (g-C 3 N 4 ) materials were applied as a new fluorescent sensor for the detection of trace silver ion in aqueous solution. The thickness of synthesized g-C 3 N 4 was 0.45 nm and obtained by exfoliating twice with ultrasonic. With the presence of ethylene diamine tetraacetic acid as a screening agent, the highly sensitive sensor reached a low detection limit of 52.3 nmol/L for silver (I) ion and there was no disturbance when silver (I) ion coexisted with other metal ions in water samples. Under the optimal conditions, the monolayer g-C 3 N 4 was successfully used to detect trace silver (I) ion in different environmental water and drinking water samples.
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