International Journal of Electrochemical Science
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2023
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IF 1.5
Kuan Chen,Tianhong Xu,Hongjian Xu,Qiang Wu,Weiguo Pan
We designed and succeeded in synthesising a sequence of g-C 3 N 4 /Zn 3 In 2 S 6 (ZIS) composite photocatalysts by means of one-step hydrothermal synthesis, which integrated different amounts of g- C 3 N 4 into ZIS. The prepared products are characterized by means of various characterization methods to determine their structure, morphology and physicochemical properties. Their photocatalytic activities were assessed according to the performance of tetracycline (C 22 H 24 N 2 O 8 , TC) degradation experiments with light radiation. This consequence of experiments showing that the g-C 3 N 4 (0.5 wt.%)/ZIS photocatalyst is most effective for the photodegradation of TC. Moreover, results from the cyclic tests confirm the stability of the g-C 3 N 4 (0.5 wt.%)/ZIS composite, which remained active after five cycles of repeated photocatalysis experiments. We can get the conclusion that O 2 - , OH and h + all played roles during the degradation process from the figures of ESR tests and active species trapping experiments. And the corresponding degradation mechanism of g-C 3 N 4 /ZIS composites is proposed. High specific surface areas, desirable absorption capability, suppression of charge recombination should be put down to its nice photocatalytic performance. Thus, it can be considered that g-C 3 N 4 /ZIS composites have broad potential application prospects in photocatalysis degradation.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Lijun Jing,Jun Lin,Qiqi Fei,Haowei Tang,Xiaodi Yang,Chong Sun
Caffeic acid (CA) and ferulic acid (FA), as the simple phenolic acids, widely exist in plants and food. In this experiment, a novel method based on graphite-like carbon nitride (g-C 3 N 4 ) and chitosan (CS) was applied to determinate CA and FA in food samples. X-Ray diffraction (XRD), fourier transform infrared spectrometer (FTIR), ultraviolet visible spectrophotometer (UV- vis ) and transmission electron microscope (TEM) were illustrated that g-C 3 N 4 was synthesized successfully and had a unique two-dimensional structure. Under the optimized conditions, including the scan rate, pH and so on, the modified electrode had a sensitive response to CA and FA in the range of 1-30 μg/mL and 5-30 μg/mL with the detection limits of 0.354 μg/mL and 4.964 μg/mL (S/N=3), respectively. The electrochemical method showed satisfactory results and provided a new approach to determinate phenolic acids with many advantages, such as rapid response, easy operation, low cost and highly sensitive.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
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IF 9.5
Luolu Zhou,Meng Chen,Hu Yang,Zhen-liang Xu
This study introduces a novel ultrafiltration (UF) membrane, called NFFM, which utilizes a nanofiber (NF) layer as an integral filler during the phase inversion process. The photoactive NFFM was prepared using photoactive PAN-C 3 N 4 (PCN) NF, which is made using C 3 N 4 nanosheets as a visible light responsive photocatalyst with a loading ratio of up to 20%. NFFM membranes made using PAN NF, hydrophilic modified PAN-C 3 N 4 (HPC) NF as filler, and PAN-C 3 N 4 blend membrane were also prepared for comparison. NFFMs showed special morphologies, such as porous surfaces, selective layer located at the internal interface in cross-section, diverse pore sizes and pore size distribution , which are different from that of the traditional blend membrane made with the same ratio of components. Because the dissolving of NF layer into the casting solution changes the composition, polymer distribution, and property of the casting solution, thus change the membrane property. Thickness, composition and surface states of NF Layer can influence its dissolution process. Membrane filled with PCN NF (NFFM-PCN) showed a smaller pore size than membrane filled with HPC (NFFM-HPC), due to the low solubility of HPC. Moreover, a longer contacting time can cause the casting solution penetrate into the surface of the HPC layer, leading to a smooth surface. Finally, dye rejection and photoactivity test showed that NFFM-PCN showed better dye rejection property and photoactivity than other membranes, despite the lower photoactivity of C 3 N 4 due to the coverage effect of PAN. Overall, this primitive study provides a new method for preparing a new type of membrane for some potential applications.
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MATERIALS RESEARCH BULLETIN
·
2023
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IF 5.4
Xin Yang,Zhaopeng Zhang,Jiang Wu,Zhengrong Zhu,Tao Zhang,Ping He,Yongfeng Qi,Shang Xiang,Mengjie Bai,Xingyue Qi
Construction of heterojunction and formation of oxygen vacancy are effective methods to improve the performance of photocatalysts. In this work, Er 3+ -doped BiOIO 3 /g-C 3 N 4 photocatalyst with oxygen-rich vacancies was prepared by a simple hydrothermal and calcination method for the photocatalytic oxidation of elemental mercury. The structural properties of BiOIO 3 /g-C 3 N 4 /Er 3+ were analyzed by XRD, SEM and BET. The results showed that all samples exhibited good photocatalytic oxidation ability for Hg 0 under visible light irradiation. Among them, the photocatalyst with Er 3+ -doped BiOIO 3 /g-C 3 N 4 and then calcined has the highest removal efficiency of Hg 0 , which is 68.83%. This may be due to the increase of oxygen vacancy caused by Er 3+ doping, which enables the photocatalyst to have higher electron transfer rate and wider visible light absorption range. Finally, the possible mechanism of photocatalytic oxidation of gaseous elemental mercury with BiOIO 3 /g-C 3 N 4 /Er 3+ photocatalyst was proposed. This study provides some reference for the design and application of photocatalysts containing oxygen vacancies.
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INORGANIC CHEMISTRY
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2023
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IF 4.6
Xuan Jiang,Zhaodong Nan
Multiple oxidation states of first-row transition-metal cations were always doped in g-C3N4 to enhance the catalytic activity by the synergistic action between the cations in the Fenton-like reaction. It remains a challenge for the synergistic mechanism when the stable electronic centrifugation (3d10) of Zn2+ was used. In this work, Zn2+ was facilely introduced in Fe-doped g-C3N4 (named xFe/yZn-CN). Compared with Fe-CN, the rate constant of the tetracycline hydrochloride (TC) degradation increased from 0.0505 to 0.0662 min–1 for 4Fe/1Zn-CN. The catalytic performance was more outstanding than those of similar catalysts reported. The catalytic mechanism was proposed. With the introduction of Zn2+ in 4Fe/1Zn-CN, the atomic percent of Fe (Fe2+ and Fe3+) and the molar ratio of Fe2+ to Fe3+ at the catalyst’s surface increased, where Fe2+ and Fe3+ were the active sites for adsorption and degradation. In addition, the band gap of 4Fe/1Zn-CN decreased, leading to enhanced electron transfer and conversion from Fe3+ to Fe2+. These changes resulted in the excellent catalytic performance of 4Fe/1Zn-CN. Radicals •OH, •O2–, and 1O2 formed in the reaction and took different actions under various pH values. 4Fe/1Zn-CN exhibited excellent stability after five cycles under the same conditions. These results may give a strategy for synthesizing Fenton-like catalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xiaohang Yang,Weilun Yu,Wensi Wang,Da Wang,Qiyao Wang,Xuyang Huo
A strategy of tuning the size of In 2 O 3 nanocube was employed to change the surface property of g–C 3 N 4 –In 2 O 3 heterojunction to boost its photocatalytic H 2 production. In the type II g–C 3 N 4 –In 2 O 3 heterojunction, the change on the size of In 2 O 3 nanocube (30, 60 and 120 nm) could regulate visible light utilization ability and photoelectric conversion efficiency of photogenerated charge carriers. The directional transfer of charge carriers caused the accumulation of photoexcited electron in plasmonic In 2 O 3 and localized electric field enhancement. The intensity and spatial distribution of localized electric field could be tuned by the adjustable size of In 2 O 3 nanocube. Therefore, the obtained g–C 3 N 4 –In 2 O 3 heterojunction with an optimal size of In 2 O 3 nanocube (60 nm) exhibited supreme photocatalytic H 2 evolution rate of 3.1 mmol h −1 g −1 with a high apparent quantum efficiency of 5.27%, which was 7.5 times higher than that of bare g-C 3 N 4 nanosheet (0.4 mmol h −1 g −1 ).
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 18
·12754-12766
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IF 3.3
Qixiao Gai,Shoutian Ren,Xiaochun Zheng,Wenjun Liu
Cu nanoparticles (NPs) are low-cost surface plasmonic resonance (SPR) metal nanostructures, and their SPR properties can be used to enhance the photocatalytic hydrogen evolution performance of carbon nitride (C3N4). But their actual performance is usually limited, and one key factor is their poor interfacial quality. In this work, a highly conductive reduced graphene oxide (RGO) interlayer is introduced between protonated C3N4 (PCN) nanosheets and Cu NPs, which can act as an efficient sink for photogenerated electrons from C3N4 and hot electrons from Cu NPs, and simultaneously serve as reaction sites for the hydrogen evolution reaction, and accelerate the charge transport by the formed C–O–C and C–O–Cu bonds. The optimal hydrogen evolution rate of the optimized PCN/RGO/Cu is 1.30 mmol g−1 h−1, which is 6.76, 2.47 and 2.41 times that of PCN, PCN/RGO and PCN/Cu, respectively, and it can further reach up to 13.22 mmol g−1 h−1 by loading moderate Pt NPs. Meanwhile, the introduced RGO can effectively anchor Cu NPs to enhance the stability of the photocatalyst. In addition, due to the broad SPR response of Cu NPs, a near-infrared photocatalytic performance is realized for PCN/RGO/Cu with an apparent quantum efficiency of 0.46% at 765 nm.
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ENVIRONMENTAL TECHNOLOGY
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2023
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IF 2.8
Qian Yang,Wensong Lin,Zhichang Duan,Sen Xu,Junnan Chen,Xin Mai
In this work, g-C3N4/ZIF-8 heterojunction photocatalysts were synthesised by the process by which the metal-organic framework ZIF-8 nanoparticles were grown onto the g-C3N4 layer in situ. Bismuth element was doped into the as-prepared g-C3N4/ZIF-8 material and a new type of Bi@g-C3N4/ZIF-8 composite photocatalysts was manufactured, in which the doping element acts in adjusting the bandgap in the photocatalysts. The prepared photocatalysts were characterised by XRD, FESEM, TEM, FTIR, XPS, UV–VIS DRS, photoluminescence and photo-electrochemical experiments. The results show that the ZIF-8 nanoparticles grown in situ were well-formed onto the g-C3N4 layer, and bismuth was evenly doped into the gaps of the g-C3N4/ZIF-8 framework. The degradation rate of methylene blue by CNZ-1.5(Bi)-12, which was a photocatalyst composed of 12% Bi-doped with g-C3N4/ZIF-8 material (the mass ratio of g-C3N4: ZIF-8 = 1:1.5), reached 86.6% under visible light irradiation within 60 min. The free radical scavenging experiment and electron spin resonance spectroscopy showed that ∙OH was the main active substance. Bismuth doping into the photocatalytic system promotes the excitation of electrons from the valence band to the conduction band and provides a good channel for the transmission of photogenerated carriers as well. It is achieved that intensive visible light absorption, the enhanced separation efficiency of photogenerated carriers, and excellent thermal stability and high recyclability in the novel composite photocatalyst, owing to the synergistic effect of the introduced bismuth with the heterostructure of g-C3N4/ZIF-8. Therefore, the synthesised Bi@g-C3N4/ZIF-8 heterojunction photocatalysts may be used as a good photocatalyst for purifying and degrading organic matter in sewage.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Shuo Shi,Mingmin Jia,Meisheng Li,Shouyong Zhou,Yijiang Zhao,Jing Zhong,Dingliang Dai,Jianhao Qiu
Zinc oxide–Graphitic carbon nitride (ZnO@g-C 3 N 4 ) composite membranes were prepared via in-situ growing ZnO crystals in the g-C 3 N 4 membrane. In this composite membrane, ZnO crystals were embedded in loose surface layers of g-C 3 N 4 membrane, which can repair some non-selective defects and improve the dye retention performance. In addition, the hetero-structures formed between ZnO and g-C 3 N 4 nanosheets promoted the separation of photogenerated electron-holes in g-C 3 N 4 layer, and improving the photocatalytic and anti-fouling performance of ZnO@g-C 3 N 4 composite membranes. Herein, the prepared composite membranes showed excellent dye removal performance and self-cleaning property in dynamic recirculation filtration systems under visible light irradiation. The optimized sample (CNZ-0.15 g) showed MB removal efficiency of 94.4% and water flux of 336.8 L.m −2 .bar −1 .h −1 . The outcome of this research would suggest the application of graphitic nitride nanomaterials for developing highly efficient photocatalytic membranes.
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Huihu Wang,Hao Tu,Feng Chen,Huang Xu,Ziguan Zhang,Guode Chen,Chenhuinan Wei,Xing Xiang,Zhixiong Xie
Through a facile oil bath method, a novel highly dispersed NH 2 -MIL-101(Fe)/carboxylated g-C 3 N 4 (NM-101(Fe)/CCN) heterostructure was prepared using the chemical bonding between carboxyl groups and -NH 2 groups. Compared with the octahedral morphology of pure NM-101(Fe), the chemical bonding interaction promoted the heterogeneous nucleation and growth of NM-101(Fe) to form nanometer-sized granular morphology, which was homogeneously dispersed on CCN surface. Cr(Ⅵ) and ciprofloxacin (CIP) were selected as the typical pollutant models in micro-polluted water sources. The results showed that 10 %NM-101(Fe)/CCN heterostructure could remove 97 % of Cr(Ⅵ) in 60 min and 88 % of ciprofloxacin (CIP) in 120 min. In the dual pollutant system of Cr(Ⅵ) and CIP, Cr(Ⅵ) reduction and CIP degradation can promote each other, and the degradation efficiency of CIP reached 96 % within 120 min. The apparent rate constant of 10 %NM-101(Fe) /CCN heterostructure for Cr(Ⅵ) reduction was 4.30 and 9.67 times of that of NM-101(Fe) and CCN, respectively, which may be ascribed to the interface electric field and good interface bonding of heterojunction . The charges separation efficiency was significantly improved, which effectively enhanced the photocatalytic activity.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yixuan Lv,Dandan Ma,Chao Yang,Kunli Song,Le Shi,Yonghong Cheng,Chunming Niu,Jian-Wen Shi
Lead-free halide perovskites have enormous superiority in photoelectric devices, but low photocatalytic hydrogen evolution (PHE) hinders their application in photocatalysis. Here, a heterojunction composed of CsCu 2 I 3 (CCI) perovskite and graphite carbon nitride (CN) is constructed by in-situ hot-injection method for the first time. The resultant CCI/CN presents a significantly enhanced PHE performance from hydroiodic acid (HI) splitting with a PHE rate of 2212 umol/g/h, which is four times higher than CCI and nearly ten times higher than CN. It is revealed that a unique N-I bond is formed by the connection of N in CN and I in CCI at the interface between CN and CCI, which serves as a fast channel for the transfer of photogenerated electrons to establish a type II mechanism, effectively promoting the PHE performance. This study provides ideas and methods for the construction of type II photocatalyst for hydrogen production using lead-free halide perovskite.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
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IF 13.6
Yizhong Shen,Xiang Gao,Huanhuan Chen,Yunlong Wei,Hui Yang,Ying Gu
Engineering efficient dual-mode portable sensor with built-in cross reference correction is of great significance for onsite reliable and precise detection of organophosphorus pesticides (OPs) and evading the false-positive outputs, especially in emergency case. Currently, most nanozyme-based sensors for OPs monitoring primarily replied on the peroxidase-like activity, which involved unstable and toxic H 2 O 2 . In this scenario, a hybrid oxidase-like 2D fluorescence nanozyme ( [email protected] 3 N 4 ) was yielded by in situ growing PtPdNPs in the ultrathin two-dimensional (2D) graphitic carbon nitride (g-C 3 N 4 ) nanosheet. When acetylcholinesterase (AChE) hydrolyzed acetylthiocholine (ATCh) to thiocholine (TCh), it ablated O 2 − • from the dissolved O 2 catalyzed by [email protected] 3 N 4 ’s oxidase-like activity, hampering the oxidation of o-phenylenediamine (OPD) into 2,3-diaminophenothiazine (DAP). Consequently, with the increasing concentration of OPs which inhibited the blocking effect by inactivating AChE, the produced DAP caused an apparent color change and a dual-color ratiometric fluorescence change in the response system. Through integrating into a smartphone, a H 2 O 2 -free 2D nanozyme-based onsite colorimetric and fluorescence dual-mode visual imaging sensor for OPs was proposed with acceptable results in real samples, which holds vast promise for further development of commercial point-of-care testing platform in early warning and controlling of OPs pollution for safeguarding environmental health and food safety.
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