CARBON
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2021
·
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.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Jinsheng Zhou,Yugui Sun,Zixiang Huang,Zhongkuan Luo,Bin Yu,Xianghui Zou,Huiyuan Hu
A novel g-C 3 N 4 @InVO 4 semiconductor catalyzed surface-initiated photo atom transfer radical polymerization without catalysts residues problem has been developed. This method proceeded in N-methyl pyrrolidone/aqueous under atmospheric conditions. To verify the versatility of this method and enhance the antifouling properties of polyvinyl alcohol (PVA) hydrogel, two types of fluorinated polymer brushes (p6F/p13F) were successfully constructed on PVA hydrogel surface instead of the subsurface. The chemical bonds between PVA matrix and fluorinated polymer brushes (p6F/p13F) enhanced the surface cross link density and resulted in an increase of thermal stability and mechanical properties. All fluorinated PVA hydrogels with excellent antifouling properties was able to tackle the biofouling problem in complex environment of the human body. In addition, all fluorinated PVA hydrogels was no cytotoxicity for L929 and NDHF according to ISO 10993.5:2009. g-C 3 N 4 @InVO 4 catalyzed SI-photoATRP provides a novel surface modification technology for various biological or medical materials in the industrial-scale application.
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JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Shaoxiu Li,Chan Lai,Changhui Li,Jintang Zhong,Zhifeng He,Qiuyi Peng,Xi Liu,Bohan Ke
A new magnetic dual Z-scheme heterostructure photocatalyst, consisting of mesoporous graphitic carbon nitride (mpg-C 3 N 4 ), BiOBr, polythiophene (PTh), and magnetic iron oxide, was developed, and its structural, optical, and electrochemical properties were analyzed. The photocatalyst was employed for the degradation of dimethyl phthalate (DMP) in water under visible light to evaluate its photocatalytic activity. The results revealed that the photocatalytic activity of the new heterostructure photocatalyst was superior to that of its single-component counterparts. The reaction kinetics of photocatalytic DMP degradation followed pseudo first-order kinetics and the reaction rate constant was 3.7- and 4.5-fold higher than those of pristine g-C 3 N 4 and BiOBr, respectively. The enhanced photocatalytic performance was chiefly attributed to the dual Z-scheme heterostructure generated between mpg-C 3 N 4 , PTh, and BiOBr, which effectively hindered the recombination of photogenerated electron and hole pairs in mpg-C 3 N 4 and BiOBr, improving the photogenerated carrier transfer efficiency. Radical trapping test results indicated that the active species, h + , ·O 2 – , and ·OH, coexisted during the photocatalytic reaction process, and that h + played a major role in the destruction of DMP molecules. DMP was degraded into intermediate small-molecule products, such as acids and alcohols, which were ultimately mineralized to CO 2 and H 2 O. The magnetic property of the new heterostructure photocatalyst enabled its straightforward separation from water using magnetic separation technology for further reuse. This study provides a new material and method for the effective removal of DMP from aqueous solution.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Xue Ma,Guowei Wang,Lifan Qin,Jue Liu,Bing Li,Yuanan Hu,Hefa Cheng
The transfer rate of photo-generated electrons is a critical factor that determines the photocatalytic efficiency of Z-scheme photocatalytic systems. Here, a novel Z-scheme g-C 3 N 4 -AQ-MoO 3 photocatalyst with anthraquinone (AQ) serving as an e – transfer channel for hydrogen production was proposed. Its enhanced photocatalytic activity is due to the accelerated transfer of e – in the form of charge inside AQ, which also suppresses the recombination of photo-generated e – and h + . In addition, the reduction area is significantly increased by the exfoliation of g-C 3 N 4 into thin layers. Due to the synergistic effect of rapid e – transfer and large reduction area, Z-scheme g-C 3 N 4 -AQ-MoO 3 has a high hydrogen production efficiency that can reach 2018 μmol/g with the presence of triethanolamine as a hole sacrificial agent after 180 min of simulated sunlight illumination. This work provides a new strategy to design and develop Z-scheme photocatalytic systems with excellent electron migration rates and high charge separation efficiency.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Ting Song,Linquan Hou,Bei Long,Atif Ali,Guo-Jun Deng
The fabrication of ultrathin MXene (Ti 3 C 2 )-based photocatalysts is highly intriguing as the charges can vectorially transfer along the two-dimensional (2D) direction despite being challenging. Herein, ultrathin Ti 3 C 2 (TiC) nanosheets with excellent conductivity are rationally introduced to ultrathin metal-free 0D/2D black phosphorus (BQ)/ultrathin g-C 3 N 4 (UCN) heterojunction for improving photocatalytic H 2 production activity. The optimized BQ/TiC/UCN composite displayed obvious advantages such as the strong interfacial contact and enhanced visible-light capture. Importantly, the incorporation of TiC nanosheets substantially accelerates charge transfer to fast separation of photoinduced carriers between BQ and UCN . The optimized BQ/TiC/UCN composite exhibited 47.2 and 19.4 folds higher photocatalytic activity (18.42 mmol h −1 g −1 ) than that of bulk g-C 3 N 4 (BCN) and UCN, respectively. The microstructure, composition, and optical properties of BQ/TiC/UCN composite were carefully characterized. The current research results may furnish fresh insights into the exploration of MXene (Ti 3 C 2 )-based catalysts with high solar energy utilization.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Liyuan Duan,Guoqiang Li,Shuting Zhang,Hongyu Wang,Yongle Zhao,Yongfa Zhang
In this study, graphitized carbon nitride photocatalysts were successfully prepared by using the desulfurized waste liquid extracting salt from coking plants. The NO x removal efficiency of g-C 3 N 4 synthesized using ammonium thiocyanate (NH 4 SCN), ammonium thiosulfate ((NH 4 ) 2 S 2 O 3 ) and ammonium sulfate ((NH 4 ) 2 SO 4 ) with different mass ratios were evaluated. The results showed that due to the addition of (NH 4 ) 2 S 2 O 3 and (NH 4 ) 2 SO 4 a large amount of sulfur-containing gas was released during pyrolysis, which significantly increased the specific surface area and pore volume of the photocatalysts. The release of sulfur-containing gas also resulted in the incorporation of sulfur, and due to this doping process the band gap of the photocatalyst was widened to 2.94 eV, thus enhancing its visible light response. C vacancies were formed in the hepazine ring, which increased the electron density around the N–(C) 3 bridge bond and formed an electron trapping center, thus inhibiting the recombination of charge carriers. The photocatalysts had increased O 2 adsorption capacity and increased number of amino groups on their surface. This facilitated the rapid generation and consumption of reactive oxygen species, inhibited the accumulation of NO 2 on the surface, reduced the production of NO 2 , thus improving the NO x removal efficiency of the photocatalysts. The principle of using “waste for waste control” was achieved, and a new method for nitrogen oxide removal was provided.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Weiming Xiang,Qiuyi Ji,Chenmin Xu,Yang Guo,Yazi Liu,Dunyu Sun,Wenwu Zhou,Zhe Xu,Chengdu Qi,Shaogui Yang,Shiyin Li,Cheng Sun,Huan He
A novel Co 3 O 4 /g-C 3 N 4 /Bi 2 O 2 CO 3 (BCCN) photocatalyst with p-n/n-n heterojunction was synthesized through a solvent-thermal method. The degradation efficiency of 20 mg/L iohexol reached 94 % in 60 min ( k app =0.0417 min −1 ) in BCCN/light/PS system, which was 2.8 and 6.5 times higher than systems of BCCN/light ( k app =0.0150 min −1 ) and BCCN/PS ( k app =0.0064 min −1 ). The g-C 3 N 4 addition lowered conduction band of the prepared material to produce superoxide radicals, activate persulfate and further prevent the recombination of photoelectrons and holes. Superoxide radicals and singlet oxygens were dominant radicals for iohexol degradation. Besides, persulfate could act as electron acceptor to enhance efficiency of electron transfer. The interaction between sulfate, superoxide and hydroxyl radicals improved singlet oxygens production. Furthermore, theoretical calculation and liquid chromatography mass spectrometry were performed to analyze degradation pathway of iohexol in the system. Ultimately, the BCCN/light/PS system can provide a new method to degrade organic pollutants in aquatic environments.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 12
·7791-7806
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IF 12.732
Yunping Wu,Wei Wei,Tianyi Ding,Sheng Chen,Rui Zhai,Caihe Bai
Two-dimensional (2D) heterostructures combine the advantageous features of different 2D materials and represent advanced electrode architectures for the development of efficient energy storage devices. However, common 2D heterostructures made by stacking different 2D sheets in van der Waals (vdW) contact impose obvious limitations in light of the energy storage performance. Here, we shed light on how heterointerface conditions exert a great influence on the electrochemical properties of the heterostructured electrode and provide an example to modulate the interface contact mode via sandwiching unique g-C3N4 mesh (m-g-C3N4). We find that such m-g-C3N4 bonded heterointerfaces can greatly increase the electrochemical activity, redox conversion kinetics and structural integrity of the constituent component (NiS2), manifesting excellent electrochemical performance with respect to vdW heterostructures. Experimental characterization along with theoretical simulations demonstrates that the synergistic effects of the mesh-bonded interfacial contact and plenty of in-between porous channels contribute to superior electrochemical performance. This study directs attention to elaborate interface engineering toward high-performance energy storage and paves the way for designing and manufacturing of advanced heterostructured electrodes for supercapacitors, batteries and other hybrid devices.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Beibei Wang,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
A unique Prussian blue analog-derived three-dimensional (3D) hollow Ni–Co bimetal oxide compound supported on two-dimensional (2D) g-C3N4 nanosheets was successfully prepared using a low-temperature annealing method. A spatial conductive frame was formed owing to formation of a p–n heterojunction between the Ni–Co bimetallic oxide and g-C3N4, which accelerated photogenerated carrier migration and inhibited recombination. The hollow Ni–Co bimetallic oxide had pores that allowed facile gas circulation. After g-C3N4 recombination, the synergistic effect of the two catalysts degraded NO (600 ppb) under visible light with an extremely high conversion rate of up to 59.1%. Cycling experiments and X-ray diffraction results confirmed the stability of the composite catalyst, which has broad application prospects in environmental science.
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WATER RESEARCH
·
2020
·
IF 9.13
Tianyu Li,Lifa Ge,Xingxing Peng,Wei Wang,Weixian Zhang
Advanced oxidation processes (AOP) based on nonradicals have attracted growing attentions because nonradical systems require much less oxidants and have low susceptibility to radical scavengers. Herein, a novel Fenton-like system that utilizes nonradicals was explored. It was derived from g-C 3 N 4 /MgO activated H 2 O 2 , and can reduce the H 2 O 2 stoichiometry from 0.94%−0.18% to 0.03%. Sulfamethoxazole (SMX), a widely used sulfonamide, was used as the model pollutant to evaluate the efficacy of the system. It was observed for the first time that organic pollutants can be degraded with singlet oxygen ( 1 O 2 ) through a nonradical pathway in the g-C 3 N 4 /MgO H 2 O 2 system. The reduced H 2 O 2 consumption was the net result of continuously-recycled H 2 O 2 from the reactions between H 2 O 2 and g-C 3 N 4 /MgO. Based on experimental results and theoretical calculations, the synthesis of g-C 3 N 4 and MgO forms a N-Mg bond with strong ability to absorb electrons and the electron transfer of H 2 O 2 to N-Mg bonding is accelerated, activation of H 2 O 2 to generate 1 O 2 . Experimental data showed that organic pollutants can be degraded rapidly over a wide pH range. Findings of this study point to a cyclical but stable Fenton-like system with reduced H 2 O 2 requirement for cost-effective remediation and treatment of organic pollutants and toxic wastes.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Xueming Dang,Zhilian Song,Huimin Zhao
A novel photoelectrochemical (PEC) sensing strategy with an amplified signal was proposed based on polypyrrole/g-C 3 N 4 /WO 3 inverse opal photonic crystals triple heterojunction. The sandwich-type detection model was applied to increase the sensitivity and favor the assembly of heterojunction structure. The heterojunction among PPy, g-C 3 N 4 and WO 3 highly improved the separation of photo-generated charges. Meanwhile, WO 3 IOPCs with good optical performance were employed to enhance the light absorption of PEC detection electrode. With the simultaneous combination of these amplification techniques, the designed PEC sensor achieved high sensitivity with low limit of detection (LOD) as 0.004 nM (≈ 1.99 ng L −1 ) and admirable selectivity in the detection of oxytetracycline under visible light irradiation.
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Nanomaterials
·
2020
·Vol. 10
·期 4
·600
·
IF 4.324
Wan Zhao,Xiuru Yang,Chunxi Liu,Xiaoxiao Qian,Yanru Wen,Qian Yang,Tao Sun,Wenya Chang,Xin Liu,Zhi Chen
The increasing discharge of dyes and antibiotic pollutants in water has brought serious environmental problems. However, it is difficult to remove such pollutants effectively by traditional sewage treatment technologies. Semiconductor photocatalysis is a new environment-friendly technique and is widely used in aqueous pollution control. TiO2is one of the most investigated photocatalysts; however, it still faces the main drawbacks of a poor visible-light response and a low charge-separation efficiency. Moreover, powder photocatalyst is difficult to be recovered, which is another obstacle limiting the practical application. In this article, g-C3N4/TiO2heterojunction is simply immobilized on a glass substrate to form an all-solid-state Z-scheme heterojunction. The obtained thin-film photocatalyst was characterized and applied in the visible-light photodegradation of colored rhodamine B and tetracycline hydrochloride. The photocatalytic performance is related to the deposited layers, and the sample with five layers shows the best photocatalytic efficiency. The thin-film photocatalyst is easy to be recovered with stability. The active component responsible for the photodegradation is identified and a Z-scheme mechanism is proposed.Keywords:thin-film photocatalyst;environmental control;antibiotic residue removal;g-C3N4/TiO2;all-solid-state Z-scheme heterojunction
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