JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Gongduan Fan,Rongsheng Ning,Zhongsen Yan,Jing Luo,Banghao Du,Jiajun Zhan,Lingshan Liu,Jin Zhang
Antibiotic contamination is increasing scrutinized recently. In this work, the Ag−AgCl/WO 3 /g-C 3 N 4 (AWC) nanocomposites were successfully synthesized using a two-step process involving electrostatic self-assembly and in-situ deposition for trimethoprim (TMP) degradation. The as-prepared photocatalysts were investigated and characterized by XRD, FTIR, XPS, TGA, SEM, TEM , UV–vis, PL and EIS. The experimental results indicated that 99.9% of TMP (4 mg/L) was degraded within 60 min when the concentration of AWC was 0.5 g/L. Reactive species scavenging experiments and electron spin resonance (ESR) experiments illustrated that superoxide radical (•O 2 − ) and photogenerated holes (h + ) were the main active species. The functional theory calculation and identification of intermediates via HPLC-MS revealed the possible degradation pathways of TMP. A double photoelectron-transfer mechanism in AWC photocatalyst was proposed. Five cycling photocatalytic tests and reactions under different solution matrix effects further supported that the AWC was a promising photocatalyst for the removal of TMP from the aquatic environment.
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ANALYST
·
2020
·Vol. 145
·期 23
·7616-7622
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IF 3.978
Jingxian Li,Xueling Shan,Ding Jiang,Yuru Wang,Wenchang Wang,Zhidong Chen
In this work, a solid-state electrochemiluminescence (ECL) sensor based on resonance energy transfer (RET) was proposed using MoS2QDs@g-C3N4 as a donor and NH2-SiO2@PTCA as an acceptor. Herein, MoS2QDs could significantly facilitate the stability and efficiency of the ECL of g-C3N4. PTCA provided a large platform to anchor NH2-SiO2 nanoparticles. The prepared MoS2QDs@g-C3N4 exhibited good spectral overlap with the UV–vis absorption spectrum of NH2-SiO2@PTCA. Based on this, we designed an “off–on” ECL sensing strategy for sensitive and selective detection of glutathione (GSH). Under the best conditions, the linear range of the sensor for GSH detection was from 0.001 to 100 μM with a detection limit of 0.63 nM (S/N = 3). More importantly, GSH in commercial samples can be detected using the proposed sensor, which indicated its superior detection capabilities and potential application value in commercial medicines.
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Nano Research
·
2021
·Vol. 14
·期 8
·2846-2852
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IF 8.897
Wang Dongdong,Al-Mamun Mohammad,Gong Wanbing,Lv Yang,Chen Chun,Lin Yue,Wang Guozhong,Zhang Haimin,Zhao Huijun
The cyclopentanone and derivatives are a class of crucial fine chemicals for various industries and currently produced by conventional petrochemical synthetic routes. Here, we demonstrated a new synthetic approach to directly fabricate N-doped carbon nanotube (N-CNTs) networks with confined Co nanoparticles from Co 2+ -impregnated bulk g-C 3 N 4 as high performance hydrogenation rearrangement (HR) catalyst to efficiently convert a wide spectrum of biomass-derived furanic aldehydes to the corresponding cyclopentanones in water under a record-low H 2 pressure of 0.5 MPa and mild temperature. We unveiled a Co-catalysed bulk g-C 3 N 4 decomposition/carbonisation CNTs formation mechanism. A new HR pathway was also unveiled.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Wei Liu,Jiabin Zhou,Ying Zhou,Dan Liu
Non-steroidal anti-inflammatory drugs (NSAIDs) are a kind of emerging pollutants that have caused people's concerns. In this work, the catalytic system with perovskite-like material Bi 2 MoO 6 modified graphitic carbon nitride (g-C 3 N 4 ) combined with peroxymonosulfate (PMS) was constructed to efficiently degrade nimesulide (NIM) in water. After the characterization by various technologies, it was found that the g-C 3 N 4 @ Bi 2 MoO 6 composite possessed an increased specific surface area, enhanced light absorption range, and lower recombination rate of the photogenerated carriers. Thereby the composites displayed stronger photocatalytic activity than pure g-C 3 N 4 and Bi 2 MoO 6 . The introduction of PMS not only provided more reactive oxygen species (ROSs) for the photocatalytic system, such as SO 4 − and 1 O 2 but also further promoted the transfer of photogenerated electrons. The multiple active species that existed in the system were involved in the photocatalytic process so that 97.4% NIM was degraded with 12 min. The degradation path of NIM was analyzed by LC-MS detection, which revealed that the structure of NIM was decomposed by the cleavage of the phenyl ether bond. The detection results of the total organic carbon (TOC) indicated that the proposed method could enhance the mineralization efficiency of NIM. This work could propose a solution for the rapid removal and degradation of NSAIDs in water.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yingshuang Song,Yusi Peng,Nguyen Viet Long,Zhengren Huang,Yong Yang
At present, there is an urgent need to develop a highly efficient adsorbent and photocatalyst with photodegradability under visible light for the removal of dye molecules in wastewater. Herein, the multifunctional three-dimensional Ag/g-C 3 N 4 /reduced graphene oxide aerogel (Ag/g-C 3 N 4 /RGOA) has been successfully prepared by a simple “one-pot” hydrothermal method , which exhibits three kinds of improved properties including excellent surfaced-enhanced Raman scattering (SERS) activity, highly efficient adsorption and photocatalytic activity. The composite aerogel presents 3D porous network structure. Importantly, the composite aerogel exhibits excellent adsorption and photocatalytic performance with adsorption rate of 44% and degradation rate of 93%. This is mainly attributed to the synergistic effect of Ag NPs, g-C 3 N 4 and RGO, which promotes the separation of photogenerated electrons and holes. In addition, the 3D porous network structure is conducive to the utilization of visible light and the transfer of photogenerated electrons. Furthermore, Ag/g-C 3 N 4 /RGOA exhibits excellent SERS activity with a detection limit of 1 × 10 −7 M for R6G molecules. The SERS performance has been utilized to monitor the process of adsorption and photodegradation of R6G by the composite aerogel. In this research, the designed multifunctional aerogel may become an attractive material for the detection and removal of dyes in wastewater.
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ENERGY & FUELS
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2020
·
IF 3.421
Min Zhou,Jiang Wu,Huaning Wang,Dayong Guan,Xinfeng Dong,Jianmin Wang,Tao Jia,Qizhen Liu
Constructing a heterojunction and designing a band gap are effective methods to promote the efficiency of a photocatalyst and solar energy utilization. In this work, g-C3N4/Yb3+-Bi5O7I nanostructured photocatalysts were successfully prepared using a hydrothermal method with glycol as a solvent and a calcination method, and the performance of the photocatalysts containing different amounts of g-C3N4 was studied. A series of characterizations confirmed the successful complexation of g-C3N4 nanosheets with Bi5O7I, and Yb3+ was successfully doped into the lattice of Bi5O7I. g-C3N4 and Yb3+ have a synergistic effect on expanding the photoresponse range of CYB(g-C3N4/Yb3+-Bi5O7I) composite photocatalysts. As expected, CYB samples have wonderful photocatalytic performance and stability in the removal of Hg0, among which CYB-20 has the highest removal efficiency, reaching 79%. Yb3+ with upconversion characteristics can convert infrared light into visible light and form new energy levels in Bi5O7I. g-C3N4 and Bi5O7I form a Z-scheme heterojunction to improve the photocatalytic performance of Bi5O7I. Besides, the electron and hole transmission paths and the catalytic mechanism of the photocatalysts are also proposed. This work offers a new approach to construct a photocatalyst system for pollutant emission control with a wide wavelength range of sunlight, which may be helpful to develop environmentally benign functional materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Dongbo Wang,Xin Yu,Qingge Feng,Xianhao Lin,Ying Huang,Xianqing Huang,Xiang Li,Kao Chen,Bohan Zhao,Zhao Zhang
In order to construct tighter heterostructures , a novel Z-scheme β-Bi 2 O 3 /g-C 3 N 4 composite (xBC) was synthesized by in-situ growth method. The crystal phase, morphology, chemical composition, optical and photoelectrochemical properties of the composites were investigated by XRD , FT-IR, SEM, TEM, XPS, UV–vis DRS , EIS , etc. The characterizations verified that β-Bi 2 O 3 nanosheets grew uniformly on the surface of g-C 3 N 4 . Meanwhile, the photocatalytic performance of xBC composites were also evaluated by degrading Rhodamine B (RhB) and p -Nitrophenol (PNP) under visible-light irradiation. As a result, 0.5BC exhibited the most superior performance, the removal efficiencies reached 71.6% for PNP in 300min and 94.8% for RhB in 120 min, with a rate constant (0.0233min −1 ) of 7.1 and 5.8 times than that of g-C 3 N 4 and β-Bi 2 O 3 , respectively. Evidences that Z-scheme carries transfer path were strongly confirmed by XPS, PL and reactive species analysis.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bo Lv,Lili Lu,Xuefan Feng,Xiaoping Wu,Xiaoming Wang,Xiong Zou,Fuqin Zhang
Photocatalysis is one of the most promising ways to realize artificial photosynthesis. The biologically inspired photocatalysts with 3D flower-like structures have attracted much attention. In this study, an effective method for the synthesis of composite photocatalytic material, NH 4 TiOF 3 /TiO 2 /g-C 3 N 4 , with a 3D camellia-like structure, was developed. The 3D hierarchical structure of the composite material enabled multiple refractions and reflections of light within the catalyst, which greatly improved the efficiency of the sunlight harvesting. The combination of NH 4 TiOF 3 and TiO 2 also effectively reduced the electron-hole recombination in the g-C 3 N 4 . To evaluate its photocatalytic performance, the prepared nanostructured composite materials were tested for the water-splitting with simulated sunlight. It showed the hydrogen evolution at the rate of 3.6 mmol/g/h, which is 4.0 times faster than that from the pure g-C 3 N 4 . The composite materials exhibited excellent cycling stability. The detailed mechanism of the Z-scheme heterojunction was also discussed. The proposed synthesis route for the creation of 3D flower-like hierarchical composites provides a new effective technique for developing efficient, active, and stable composite photocatalysts for hydrogen production.
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CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Xiaohan Ma,Qinghua Chen,Guocheng Liu,Yuanming Zhou,Dong Ma,Shuaishuai Xin,Chengze Yu,Bin Zhang,Yanjun Xin
Netlike 3D Z-scheme graphitic carbon nitride (g-C 3 N 4 ) nanosheets decorated TiO 2 nanobelt-tubes (TNBTs) photoelectrodes (g-C 3 N 4 /TNBTs) were fabricated via anodization and coating technology. The network 3D photoelectrodes were characterized by HR-TEM, XPS and UV–Vis/DRS. The photoelectrochemical properties were examined to reveal the transfer and separation efficiency of photogenerated electrons. The photocatalytic activity was investigated by the photocatalytic decomposition of tetracycline hydrochloride (TC) under light irradiation. Results showed that g-C 3 N 4 with rugged surface were loaded on TNBTs by chemical bond joint to form heterostructure. The g-C 3 N 4 /TNBTs exhibited stronger visible light absorption and reduced recombination of photogenerated electron-hole pairs than TNBTs. The photocurrent response of g-C 3 N 4 /TNBTs was ~1.88-fold that of TNBTs. The photocatalytic rate of g-C 3 N 4 /TNBTs for TC was significantly higher than that of TNBTs (0.017 min −1 vs 0.007 min −1 ). The O 2 − and h + were the dominant oxidation species during the degradation of TC. The possible photocatalytic mechanism of constructing Z-scheme heterojunction was also proposed.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Wei Ma,Na Wang,Yan Guo,Liuqing Yang,Manfei Lv,Xu Tang,Songtian Li
A novel porous structure g-C 3 N 4 with nitrogen defect photocatalysts (DCN-P) was successfully prepared by in-situ doping strategy and freeze-dried method, it exhibits enhanced photo-reduction CO 2 performance with satisfactory CO, CH 4 productivity about 19.7 umol g −1 , 37.1 umol g −1 , which is more higher than that of bulk g-C 3 N 4 (B-CN). Systematically characterization demonstrated that the synergistic effect of unique porous structure and the nitrogen defection in DCN-P can effect enhance CO 2 adsorption, increase reactive sites, improve optical absorption and narrowed band gap of g-C 3 N 4 , which is supported by both experimental and density functional theory (DFT) calculations results. More importantly, this work provides a new ideas for constructing other high-performance metal-free photocatalytic systems for CO 2 reduction.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yingying Qin,Hong Li,Jian Lu,Yonghai Feng,Fanying Meng,Changchang Ma,Yongsheng Yan,Minjia Meng
Fabricating 2D/2D heterojunction with vacancy is more favorable to the spatial separation and transfer of charge owing to the matching of unique 2D structure and vacancy engineering, but the regulation and observation of interlayer forces and electronic structure is a challenging task for synthesizing heterojunction photocatalyst and studying the photocatalytic hydrogen evolution mechanism. Herein, an original 2D/2D ZnIn 2 S 4 /g-C 3 N 4 Van der Waals heterojunction with S vacancies (ZIS-S/CN VDW) photocatalyst are firstly engineered. The optimized 30ZIS-S/g-C 3 N 4 has the highest H 2 evolution rate of 6095.1 μmol h −1 g −1 , which is primarily attributed to the fact that 2D/2D VDW heterojunction possesses larger contact area and strong electronic interaction to stimulate charge kinetics, and the vacancy engineering can enhance light absorption by regulating the electronic band structure and act as effective active sites for capturing electrons. This work not only enriches 2D/2D heterojunction photocatalytic system based on g-C 3 N 4 , but also provides alternative proposal for engineering 2D/2D heterojunction photocatalyst with satisfactory performance.
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RSC Advances
·
2020
·Vol. 10
·期 34
·20110-20117
·
IF 3.119
Fengzhi Wang,Weisheng Lei,Xinhua Pan,Bin Lu,Zhizhen Ye
Photocatalytic hydrogen evolution by water splitting has become a very effective way to solve the energy crisis. For use in that process, graphitic carbon nitride (g-C3N4) has drawn much attention for its response in the visible region. However, its insufficient sunlight absorption efficiency and easy recombination of photoinduced carriers restrict its photocatalytic activity. Herein, we demonstrate a two-step liquid ultrasonic method in water to synthesize a series of tetracyanoquinodimethane (TCNQ)–C3N4 photocatalysts aiming to form a conjugated structure by 7,7,8,8-TCNQ. g-C3N4 was treated with APTES firstly on its surface in order to give a better interface contact with TCNQ. Benefiting from the conjugation effect between TCNQ and g-C3N4, the separation and transport efficiency of photogenerated carriers were significantly improved. Besides, introducing TCNQ also broadened the absorption region. Both of these points lead to the enhancement of photocatalytic H2 production rate, with the optimized 5% TCNQ–C3N4 giving a rate nearly 9.48 times that of pure g-C3N4. Also, 5% TCNQ–C3N4 (U) was prepared with unmodified g-C3N4, which exhibited a rate only 6.87 times that of pure g-C3N4, thus validating the necessity of surface modification. Our work reveals that the rational conjugated structure could modulate the electrical and optical properties of g-C3N4, yielding an improvement of photocatalytic activities.
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