CHEMOSPHERE
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2023
·
IF 8.8
Huanjun Zhang,Yanan Yu,Yi Li,Li Lin,Chi Zhang,Wenlong Zhang,Longfei Wang,Lihua Niu
Intimately coupled photocatalysis and biodegradation (ICPB) is a promising technology to remove refractory contaminants from water. The key to successful ICPB is a carrier capable of accumulating biofilm and adhering photocatalyst firmly. Herein, BC/g-C 3 N 4 was prepared into a three dimensional porous hydrogel and used as a carrier in ICPB system for the first time. Degradation experiments revealed that the removal rate of tetracycline hydrochloride (TCH) in water by the ICPB system was 96.0% after 10 h, which was significantly higher than that by the photocatalysis (PC, 76.3%), biodegradation (B, 32.5%), adsorption (AD, 17.2%), and photolysis (P, 5.0%) systems. Photo-electrochemical tests confirmed that ICPB system had superior electron transfer ability between photocatalysts and microorganisms . The removal efficiency of COD proved that microorganisms played an important role in the mineralization process of TCH by the ICPB system. After the ICPB degradation experiment, microorganisms maintained high activity and Pseudomonas , Burkholderiaceae and Flavobacterium which had TCH degradation or electron transport ability, were enriched. In conclusion, the novel ICPB carrier overcame shortcomings of the traditional ICPB carrier and the novel ICPB system had superior degradation performance for TCH. This study provided a possible method to promote the practical application of ICPB technology .
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PubMed
高影响因子
Advanced Sustainable Systems
·
2022
·Vol. 7
·期 2
·2200378
·
IF 6.737
Ziying Xiong,Hai Hu,Ziqi Cao,Yaxin Hu,Di Sun,Hengfei Qin,Shifei Kang
Photocatalysis water treatment without artificial energy is cost-effective, waste-free and sustainable. Coventional powder photocatalysts have tiny contact surfaces, low catalytic efficiency, and are difficult to recycle and reuse, restricting their usage. Herein, a Lignin@t-FeC 2 O 4 /g-C 3 N 4 material is developed by engineering hollow quadrangle t-FeC 2 O 4 and g-C 3 N 4 nanosheets on lignin membranes through facile impregnation coating and precipitation reaction. Fast mass transport, catalytic activity and accessibility characterize hollow tetragonal FeC 2 O 4 · 2H 2 O. TEM, SEM and FTIR show that lignin binds t-FeC 2 O 4 and g-C 3 N 4 . The g-C 3 N 4 nanosheets are uniformly wrapped on the surface of lignin fibers, and t-FeC 2 O 4 is loaded between them. This structure increases visible light absorption and active site-contaminant contact. The chain reaction produces extremely active hydroxyl radicals from hydrogen peroxide because the Lignin@t-FeC 2 O 4 /g-C 3 N 4 modules are rich inFe II , according to XPS. Transient photocurrent response curves and electrochemical impedance spectroscopy suggest a promoted charge migration and isolation at the redox reaction interface in the Lignin@t-FeC 2 O 4 /g-C 3 N 4 system. As a result, Lignin@t-FeC 2 O 4 /g-C 3 N 4 degrades 99% Rhodamine B within 40 minutes, and this performance is stable even under difficult conditions, such as low hydrogen peroxide concentration and high pH. This study combines lignin membranes with the photo-Fenton reaction, and thus provides new concept for the development and application of membranes and photocatalysis.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Qiunan Sun,Xuejiang Wang,Yiyang Liu,Yanan Zhang,Siqing Xia,Jianfu Zhao
In this study, floating carbon nitride incorporating copper ferrite catalyst (CNCFEp) was synthesized by a simple coprecipitation-calcination method. The prepared catalyst was applied to the catalytic activation of peroxymonosulfate (PMS) for the degradation of antibiotics under visible light irradiation (Vis/CNCFEp/PMS system). In the presence of CNCFEp (2.0 g/L) and PMS (0.1 g/L), 97.6 % of sulfamethazine (SMT, 10 mg/L) was degraded in 30 min under neutral conditions, whereas negligible influence was observed accompanied by water matrixes. The floating composite catalyst showed excellent stability after 5 times recycling experiments. Singlet oxygen ( 1 O 2 ) and high-valent oxo-metal species were unveiled to be the major reactive oxygen species (ROS), rather than conventional hydroxyl radicals or sulfate radicals. These nonradical species were produced by direct oxidation or the transformation of superoxide ions and metastable metal composite at neutral pH. SMT was broken down by four degradation pathways in this system and a remarkable reduction in toxicity has been demonstrated by the quantitative structure–activity relationship (QSAR) prediction. Likewise, the nonradical species were capable of inactivating the bacteria ( E. coli) . This work was the first study dedicated to the mechanism of PMS activation by CNCFEp and provides a novel catalytic system for removal of organic contaminants and bacteria in environmental waters.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Kang Li,Yutong Wen,Yuanyuan Song,Na Qi,Ying Li
Facing the increasingly serious water pollution problem, photocatalytic method has been recognized as one of the best solutions due to its convenience, efficiency and low consumption. Graphitic carbon nitride (g-C 3 N 4 ), a metal-free and visible light-responsive photocatalyst , has shown great potential in the photocatalytic treatment of water pollution. This study describes a novel bottom-up strategy for constructing visible light-responsive photoactive nanocomposite g-C 3 N 4 /CNC/PAM aerogel with the g-C 3 N 4 uniformly loaded throughout a polymeric network, perfect mechanical property and high performance in treating wastewater containing organic/heavy metal compound contaminants. Aldehyde-modified negatively charged natural nanoparticle cellulose nanocrystal (CNC-CHO) was used to achieve uniform dispersion of g-C 3 N 4 , and also participate in the subsequent formation of aerogel through chemical crosslinking with photoinitiated polyacrylamide (PAM) catalyzed by g-C 3 N 4 without additional crosslinkers. The optimized porous structure of the prepared aerogel ensured high swelling rate of up to 2500%, excellent pollutant adsorption performance and high light transmittance , thus achieved high removal rate and removal efficiency for different types of pollutants including organic dyes (RhB, MB and CR) and heavy metal Cr(VI). The removal efficiency could get 99% for RhB (5 mg/L) in 6 h, and 95% for Cr (VI) (10 mg/L) in 100 min under visible light . Further more, the aerogel showed excellent mechanical stability and reusability, with no loss in activity observed after over 5 cycles of dye degradation .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Youzhou He,Mingzuo Chen,Yao Jiang,Lei Tang,Jianning Yu,Ya Chen,Min Fu,Xuemei Tan,Jiajia Jing,Guizhi Zhang,Xingyan Liu
The modification of graphite carbonitride (g-C 3 N 4 ) is beneficial to increase its specific surface area and high quantum efficiency, thus improving its activity. Herein, the Yb 2 O 3 /g-C 3 N 4 composites were adjusted through dual regulation synergistically (nanostructure design of g-C 3 N 4 and addition of lanthanide oxides Yb 2 O 3 ) to improve the photocatalytic performance of hydrogen production and NO removal simultaneously. The as-prepared 1% Yb 2 O 3 /tubular g-C 3 N 4 could efficiently promote the photocatalytic hydrogen evolution (4071.763 μmol·g −1 ·h −1 ) and NO removal performance (54.20%), which was approximately 8.85 times and 32.01% higher respectively than that of bulk g-C 3 N 4 prepared by melamine (g-C 3 N 4 -M). The formation process of·O 2 - and·OH radicals and the oxidation process of NO had been systematically studied through ESR and in-situ DRIFTS , which proved that the coupling of tubular g-C 3 N 4 with Yb 2 O 3 had a positive effect. This work provided a novel strategy for dual regulation (adjust morphology and metal oxide introduction) synergistically design of bifunctional photocatalysts to enhance H 2 production and NO removal simultaneously.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Linlin Sun,Yibing Feng,Kai Ma,Xiaohan Jiang,Zhengyang Gao,Jigang Wang,Nan Jiang,Xiaoshuo Liu
It is significant to realize the synergistic effect of single-atom sites and its support to obtain excellent performance photocatalysts. Here, single-atom silver (SAAg) is embedded into the hierarchical tremella-like carbon nitride (3DT-CN) by an efficient one-step reduction method. The photo-degradation mechanism of SAAg/3DT-CN for tetracycline (TC) is first proposed. And the synergistic effect to improve photocatalytic activity is also discussed in depth. Density functional theory (DFT) calculations and physicochemical characterizations reveal that the synergistic effect of SAAg and 3DT-CN has improved the absorption capacity of visible light, the binding energy with oxygen, charge transfer behavior and other properties. Electron spin resonance (ESR) and capture experiments validate the active species involved in the reaction. The first-order kinetic constant of TC degradation by SAAg/3DT-CN is 8.4 times and 3.8 times that of 3DT-CN and AgNP/3DT-CN in 75 min, respectively. This work provides a meritorious structure-activity strategy for the removal of refractory antibiotics.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xiangyu Wang,Yiming Wang,Jun Ma,Ping Ning
The wide band gap of g-C 3 N 4 and severe aggregation of Fe 0 adequately limit their applications. To address these two critical issues, novel ternary phosphorus-doped g-C 3 N 4 /Fe 0 @expanded graphite carbon layer (P-CN/Fe 0 @EGC) photocatalyst with extremely narrow band gap and significantly enhanced catalytic activity was in-situ synthesized. P-CN/Fe 0 @EGC hybrid composite exhibited excellent photodegradation performance of tetracycline (TC) removal, which is 5.18 and 1.92 times higher than that of pristine g-C 3 N 4 and Fe 0 , respectively. Enhancement in photocatalytic activity is evaluated via photoluminescence (PL), UV–vis DRS, XRD and electron spin resonance (ESR). A reasonable catalytic mechanism of P-CN/Fe 0 @EGC is proposed. The multiply synergistic mechanisms of phosphorus-doped g-C 3 N 4 (P-CN), Fe 0 and expanded graphite carbon layer (EGC), as well as the strong reducibility of Fe 0 were accounted for the expanded visible light absorption range. The even dispersion of Fe 0 on porous and worm-like structured P-CN/EGC effectively and successfully avoided the decline in photocatalytic activity caused by aggregation of Fe 0 nanoparticles . Compared with g-C 3 N 4 , the band gap of phosphorus-doped g-C 3 N 4 was narrowed from 2.79 to 2.60 eV. It is worth noting that Fe 0 plays an important role in accelerating electron transfer speed and efficiency between P-CN and EGC. The·O 2 − and h + were the dominant active substances for TC degradation . Moreover, P-CN/Fe 0 @EGC catalyst could be used repeatedly for at least 7 cycles with high TC removal efficiency. This study may pave a new way on designing high efficient ternary hybrid photocatalyst for antibiotic degradation.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yanqing Cong,Yanan Li,Xiaoran Wang,Xing Wei,Lin Che,Shi-Wen Lv
In this study, a double p-n heterojunction based on g-C 3 N 4 @NiO/Ni@MIL-101 ternary composite was successfully prepared by a feasible method. Results suggested that the rational growth of NiO and MIL-101 on the surface of g-C 3 N 4 can improve the absorption capacity for visible light. Importantly, the formation of double p-n heterojunction can effectively inhibit the recombination of photogenerated electrons and holes. Due to the significant Fermi level differences among NiO, MIL-101 and g-C 3 N 4 , the internal electric fields were established on the interface after constructing the composite, consequently reducing the electrical resistance and accelerating the transfer of photoinduced charge carriers. As expected, the g-C 3 N 4 @NiO/Ni@MIL-101 ternary composite with good stability had excellent photocatalytic performance in the degradation of emerging pollutants, and the removal efficiency of ibuprofen was as high as 95.6%. The •O 2 − , •OH and 1 O 2 were the major active species in the reaction system. Furthermore, developed photocatalytic oxidation system can also achieve the rapid inactivation of bacteria. Based on the synergistic effects of energy band position and double internal electric fields, the separation and transfer of photogenerated charge carriers followed a traditional type-II route. In short, current work not only constructed a promising photocatalyst, but also shared an effective strategy for boosting the photocatalytic activity.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Dongshu Sun,Tianyu Zhou,Guangbo Che,Chunbo Liu
The engineering and synthesis of g-C 3 N 4 -based photocatalysts with high utilization rate of charge carriers and extensive visible light responsive range is pivotal to alleviate the energy crisis. Herein, inosculating P-doped g-C 3 N 4 with NiS (NPCN) via the calcination-solvothermal method to establish 2D/2D Schottky-junction with interfacial P-Ni bond photocatalyst can achieve high-efficiency hydrogen production upon exposure to visible light, the 2-NPCN displays superior photocatalytic H 2 -release ability up to 299.6 μmol in the absence of cocatalysts, which is approximately 53.3 times higher than that of BCN (5.6 μmol). Not only that, the apparent quantum efficiency (AQE) of the reconstructed material is 11.7% at 420 nm. Noticeably enhanced photocatalytic HER activities accrue from the fact that P-doped g-C 3 N 4 can shorten the band gap for widening the visible light responsive range, and the synergistic effect of Schottky-junction and P-Ni chemical bond can increase the separation efficiency of electron-hole pairs and efficiently ameliorating the charge transfer dynamics. Moreover, the 2D/2D structure with large and tight contact interfaces can decrease the charge migration distance. In this work, the 2D/2D NPCN Schottky-junction photocatalyst reasonably designed provides a meaningful case for meeting the requirements for high-efficiency hydrogen production driven by solar energy.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yi Peng,Juntao Wang,Ying Yan,Wenlei Wang,Hongbo Xiao
In this work, a high content of pyrrole nitrogen carbon nitride (HPCN)-SnS 2 has been successfully constructed with −C═Sn− chemical bond as the interface framework. The charge state of Sn species was adjusted by β particles to obtain controllable sulfur defects onto the HPCN-SnS 2 through electron beam irradiation (EBI). The composites exhibited excellent photocatalytic oxidation capacity of As(Ⅲ) and adsorption capacity of As(Ⅴ). It is confirmed that the optimized HPCN-SnS 1.38 can remove the total As concentrations below 0.40 mg/L within 80 min. Additionally, the effect of various conditions (pH value and type of anions) was evaluated using degradation experiments, and HPCN-SnS 1.38 could be reused at least 5 times without an obvious reduction in the photocatalysis and adsorption performances. Based on the experimental results, the photocatalytic mechanism of As(Ⅲ) by HPCN-SnS 2 after electron beam irradiation was studied. Free radical quenching experiments and electron paramagnetic resonance (EPR) showed that the oxidation of As(III) under visible light is mainly controlled by •O 2 − and •OH, and •OH is converted from •O 2 − under acidic conditions.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Ding Jiang,Ming Qin,Linhua Zhang,Xueling Shan,Zhidong Chen
Quests for stable and highly efficient electrochemiluminescence (ECL) emitters and a full understanding of the relation between the ECL emitter structure and its properties are a continual and active theme in the fields of ECL. In this work, an intense and stable ECL platform was achieved by encapsulating 0D graphite carbon nitride quantum dots (g-C 3 N 4 QDs) into 3D graphene hydrogel via a facile hydrothermal approach. The architectures of the as-fabricated 0D g-C 3 N 4 QDs/3D graphene hydrogel nanocomposites showed 4.3-fold ECL intensity relative to that of pure g-C 3 N 4 . This phenomenon was caused by a pore confinement effect, which could increase the electrochemical reaction efficiency because the pore channels could promote electron transfer and mass transport. The confinement effect could also localise a very large luminophore near the electrode surface, resulting in enhanced ECL emission. Moreover, the as-fabricated architecture ensured the stability of the g-C 3 N 4 QDs in the ECL field due to the increased dispersibility. On the basis of the excellent ECL performances, a novel ECL biosensor was fabricated for highly selective and sensitive detection of kanamycin (KAN) with the assistance of an aptamer. The proposed ECL sensor can quantify KAN from 1 pM to 50 nM with a limit of detection of 0.33 pM. Such work offers an efficient design idea for achieving a high-performance ECL platform and provides new insight into developing and applying a g-C 3 N 4 -based ECL system.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 8
·5041-5052
·
IF 3.553
Hu Leqi,Jia Fuchao,Wang Shuo,Shao Xingyan,Wang Xiaomei,Sun Yuping,Yin GuangChao,Zhou Tong,Rajan Ramachandran,Feng Zhenyu,Liu Bo
In the present study, the nano-composite of Co-doped g-C 3 N 4 and ZnO (Co–C 3 N 4 /ZnO) sensor was successfully prepared by using solid-phase precursor synthesis method. The crystalline phases were analyzed by X-ray diffraction (XRD), the microstructure of Co–C 3 N 4 /ZnO sensor was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the chemical bonding states were analyzed by X-ray photoelectron spectroscopy (XPS). The gas sensing performance of Co–C 3 N 4 /ZnO sensor was systematically studied and compared with other sensors at the operating temperature of 200–370 °C, and the highest response was observed at 370 °C. Interestingly, Co–C 3 N 4 /ZnO sensor exhibited better response to o-xylene, m-xylene and p-xylene compared with other BTEX gases tested in this study; especially about 11 times higher response was observed against p-xylene compared with pure ZnO sensor at 370 °C. In addition, this sensor showed good stability and repeatability even after 14 weeks with a response/recovery time of 2 s/2 s. The improved gas sensing performance of this sensor was attributed to the formation of more active sites and more number of active oxygen species on the surface of ZnO. Based on these results, it could be ideal to explore Co–C 3 N 4 /ZnO sensor for the rapid detection of BTEX gases, specifically for p-xylene, in the surrounding environment.
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高影响因子
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