COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Qian Fu,Chenxi Wang,Jia Chen,Yilin Wang,Chunyan Li,Yixi Xie,Pengcheng Zhao,Junjie Fei
Dopamine is an important neurotransmitter that has a crucial impact on the physiological health of the human body. Consequently, it is necessary to establish a highly selective and sensitive method for the determination of dopamine levels in serum. In this work, g-C 3 N 4 and BiPO 4 /BiOCl (BPCl) were used as optoelectronic materials to construct a novel dopamine photoelectrochemical sensor. Moreover, the optoelectronic materials were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy and steady-state fluorescence spectroscopy . Meanwhile, the photoelectrochemical performance of the modified electrodes with different materials was investigated, and the results showed that BPCl/C 3 N 4 /GCE has excellent photoelectrochemical performance. Concomitantly, the dopamine photoelectrochemical sensor also has a wide detection range (0.05–10 μM) and limit of detection (LOD = 0.023 μM). Furthermore, it has good reproducibility, selectivity and stability, which can be used in the actual sample detection of serum.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2022
·Vol. 2022
·期 7
·e202101005
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IF 2.551
Peng Mei,Jingting Xiao,Xinshui Huang,Ahadi Ishag,Yubing Sun
Graphical The STO/CN composites were excited under sun light conditions and generated electrons (e − ) in conduction band (CB) and holes (h + ) valence band (VB). The bandgap of SrTiO 3 and g-C 3 N 4 was calculated to be 3.02(=1.96-(−1.06)) and 2.51 eV(=1.39-(−1.12)), respectively. Generally, organics (i. e., CH 3 OH) were oxidized into CO 2 and H 2 O by h + , while U(VI) was reduced into U(IV) by e − . Thus, the excellent charge separation and electron transfer capabilities of STO/CN enhanced the photocatalytic reduction of U(VI) under visible light irradiation. Perovskite-based composites have been widely investigated in photocatalysis due to their narrow bandgap width and high separation efficiency of photogenerated charges. Herein, the novel perovskite/carbon nitride heterojunction (SrTiO 3 /g-C 3 N 4 ) was synthesized by a simple calcination method and then was applied in the photocatalytic reduction of U(VI) from aqueous solutions. The characterizations indicated that incorporation of SrTiO 3 increased the charge separation efficiency and light absorption range, while it decreased electron-hole recombination. Specifically, the SrTiO 3 /g-C 3 N 4 composite exhibited the high U(VI) removal rate (100 % in 15 min), high selectivity (88 % U(VI) from seawater within 15 min), chemical stability, and excellent regeneration performance due to the improved electron utilization efficiency. Electrons play an important role in U(VI) photocatalytic reduction according to quenching experiments, XPS, and electron paramagnetic resonance analysis. These findings are crucial for the application of perovskite-based composites in the actual environmental cleanup under visible-light to improve solar energy utilization.
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OPTICAL MATERIALS
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2023
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IF 3.9
Qingbo Yu,Fan Liu,Jia Pan,Qingping Wang,Zishe Xu,Shuli Deng,Xinxin Ren,Yuqi Li,Naishen Shi
Composite precursors with hydrogen bonding interactions (Fe(OH) 3 /DCDA) and chemical bonding interactions (Fe(OH) 3 /PA/DCDA) were constructed by simple hydrothermal method , respectively, and then the corresponding photocatalysts (Fe 2 O 3 /g-C 3 N 4 and Fe 2 O 3 /C/g-C 3 N 4 ) were calcined under N 2 atmosphere to study the effect of different bonding types of precursors on the structure and performance of the photocatalysts. It is shown that the strong chemical bonding interaction between -CHO in Fe(OH) 3 /PA and -NH 2 in DCDA causes the calcined Fe 2 O 3 /C/g-C 3 N 4 to exhibit a lower density of terminal amino defects compared to the weak hydrogen bonding interaction, which greatly facilitates the photogenerated electron-hole separation. In addition, the strong chemical bonding interactions in the precursors would also cause incomplete polymerization during calcination , leading to the formation of porous structures in the catalyst Fe 2 O 3 /C/g-C 3 N 4 , which increases the specific surface area on the one hand and enhances the photoavailability on the other. Therefore, the prepared Fe 2 O 3 /C/g-C 3 N 4 has good photocatalytic activity and can degrade 51.28 % of MB solution after 60 min of continuous irradiation under visible light , which is 2.8 times higher than that of g-C 3 N 4 .
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2023
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IF 2.7
Yue-Feng Tang,Meng-Yun Zhao,Guo-Zhi Han
Herein, a novel composite of g-C 3 N 4 and silver nanoparticles(g-C 3 N 4 @Ag) with enhanced bifunctional catalytic activity through chemical etching is reported. A kind of g-C 3 N 4 @Ag composite by one-pot route, then treated the product with sodium borohydride (NaBH 4 ) solution for a certain time is first synthesized. The property and morphology of the g-C 3 N 4 @Ag composite changed greatly after the treatment. Compared with the pristine g-C 3 N 4 @Ag composite, the NaBH 4 -etching endowed g-C 3 N 4 @Ag composite (RACN) with smoother two-dimensional plane structure, as well as an extension of the conjugate system which originating from the stronger chemical connection between the Ag nanoparticles and g-C 3 N 4 . Furthermore, research results indicated that the RACN showed superior broad-spectrum catalytic performance for the reduction of aromatic nitro compounds, and the catalytic efficiency of the RACN is enhanced dozens of times by the treatment. Moreover, the photocatalytic activity of the RACN is also greatly improved. This discovery provides an efficient and facile method toward the enhancement of catalytic activity of semiconductor and metal nanoparticle composites by chemical etching.
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Carbon Letters
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2023
·
IF 4.5
Yang Yang,Hu Huali,Ai Jixing,Wang Hong,Du Haijun
Sulfamonomethoxine (SMM) is widely used to inhibit Gram-positive and Gram-negative bacteria, and improper use of SMM is detrimental to human health and ecological stability. Therefore, a sensitive determination method is of great importance for monitoring SMM residues in water, meat, milk, eggs, etc. Herein, a Pt-functionalized S-doped graphitic carbon nitride (Pt/S-g-C 3 N 4 ) was constructed for the electrochemical determination of SMM. The as-developed Pt 3 /S 3 -g-C 3 N 4 sensor showed a significant SMM determination performance. The electrochemical oxidation of SMM on Pt 3 /S 3 -g-C 3 N 4 /GCE involves two electron transference and was limited by a diffusion process. The as-developed Pt 3 /S 3 -g-C 3 N 4 /GCE sensor has good linearity in a wide range of 0.1–120 μmol/L and a remarkably low limit of detection (LOD) of 0.026 μmol/L for SMM determination. In addition, the sensor has high selectivity and anti-interference properties for SMM detection. Furthermore, this Pt 3 /S 3 -g-C 3 N 4 /GCE sensor has good reproducibility and stability. Moreover, the recoveries were in the range of 89.6–112.2% for the detection of the SMM in a real sample of egg. The proposed Pt 3 /S 3 -g-C 3 N 4 /GCE sensor shows great potential for practical applications in detecting trace amounts of antibiotics.
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PROGRESS IN ORGANIC COATINGS
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2023
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IF 6.6
Zuwei Song,Yingmin Sun,Jing Wang,Bei Qian
Graphitic carbon nitride (g-C 3 N 4 ) can function as nanofillers in anti-corrosion coatings due to its two-dimensional structure. Here, we investigate the corrosion protection performance of g-C 3 N 4 for polyvinyl butyral (PVB) coatings. Transmission electron microscope (TEM) of the calcinated g-C 3 N 4 displays a sheet-like nanostructure with a single or few layers. By subjecting PVB coatings containing g-C 3 N 4 to electrochemical impedance spectroscopy (EIS) and salt spray tests, we were able to investigate their anti-corrosion performance thoroughly. Results of EIS shows that the values of coating resistance increased significantly for all PVB coatings enriched with g-C 3 N 4 nanosheets . The PVB coating containing 10 wt% g-C 3 N 4 nanosheets survived after a 300 h salt spray test. UV and Xenon lamp aging tests provide additional information and evidence to prove their potential in practical application.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaoqing Wang,Chengjiang Qian,Wenjie Pan
Extended utilization of polypropylene (PP) is compromised by its high flammability. Owing to the merits of easy preparation and abundance in raw materials, graphitic-like carbon nitride (g-C3N4, denoted as CN) is favored as flame retardant for PP. Nevertheless, it is hard to acquire the satisfying flame retardancy efficiency when CN dosage is low. Here, the interfacial assembly strategy is utilized to obtain the micro–nano structure of phosphorus-doped CN/CoMoO4 (PCN–Co) as flame retardant for PP. When using 2.0 wt % PCN–Co, the decomposition temperatures are markedly enhanced, confirming the delayed thermal degradation. Peak heat release rate and total heat release values are impaired by 33.6 and 12.0%, implying the inhibited release of heat. Peak smoke production rate and total smoke production values are dampened by 45.1 and 34.9%, signifying hindered emission of smoke. In short, this work provides inspiration for the design of CN-based nanostructures, mining their potentials in polymer composite fields.
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Surfaces and Interfaces
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2023
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IF 6.2
Qin Lei,Jiaxin Li,Junjie Lei,Bo Hong,Xiaoling Li,He Li,Yiwen Wan
In this study, a simple wet chemical method was used to prepare p-n heterojunction photoelectric composites (Bi 2 S 3 @g-C 3 N 4 ). The p-n junctions were formed to facilitate charge transfer as well as strongly suppress electron-hole pair recombination, thus enhancing the photoelectrochemical (PEC) characteristics. Particularly, according to the transient surface photocurrent response, the photocurrent intensity of the prepared composites was 2.98 times higher relative to the pristine g-C 3 N 4 material. The photocurrent signal revealed the prepared novel PEC sensor composed of Bi 2 S 3 @g-C 3 N 4 composite material, which can be used for sensitively and selectively detecting chlorpyrifos. This method presented a linear change from 50 ng/mL to 0.1 mg/mL of chlorpyrifos under the optimal conditions. The linear regression equation was I(μA)=0.8546-0.1558lgC(mg/mL) (R 2 =0.9758) and the detection limit was 0.03 ng/mL (S/N=3). In addition, the novel sensing platform with high selectivity could assist in rapidly and effectively detecting chlorpyrifos in environmental analysis.
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Journal of Water Process Engineering
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2023
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IF 7
Lei Ma,Qiuyan Bi,Wanji Zhou,Xingliang Liu,Fuju Qi,Hao Zhang,Yifan Gao,Shiai Xu
Nanofiltration (NF) membrane with high selectivity and permeance is important for recovering lithium from salt lake brine. In this work, sandwich-like NF membranes were prepared using polyamide (PA) as the interfacial polymerization (IP) layer, dopamine (DA) and zwitterion-g-C 3 N 4 as the composite interlayer and polyethersulfone (PES) ultrafiltration (UF) membrane as the substrate. Three NF membranes were prepared with different zwitterion-g-C 3 N 4 : M3 membrane modified with C 5 H 12 ClNO 2 -g-C 3 N 4 , M4 membrane modified with C 12 H 24 N 2 O 4 S-g-C 3 N 4 and M5 membrane modified with C 19 H 39 NO 2 -g-C 3 N 4 , and their physical and chemical properties, separation capacity, and antifouling behaviour were analyzed. The zwitterion-g-C 3 N 4 composite interlayer improves the hydrophilicity and pore structure of NF membranes. The water contact angle (CA) of M5 membrane is 25.5°and its pore size is 0.49 nm. M5 membrane shows a high retention rate of 96.66 % for Mg 2+ in mixed salt solution (Mg 2+ /Li + = 84) and performs well in salt lake brine with a rejection of 97.90 % to Mg 2+ . The flux recovery ratio (FRR) can be kept above 93 %. This study may give ideas for the preparation of composite NF membrane for water softening and lithium utilization.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 7
·2827-2842
·
IF 3.3
Hao Tianran,Sun Shiping,Xu Hongliang,Yu Han,Cao Wenbo,Shao Gang,Fan Bingbing,Wang Hailong,Lu Hongxia
Porous g-C 3 N 4 composed of nanosheets (p-gCN-NS) was synthesized through firstly grinding the hydrochloric acid-treated melamine with ammonium chloride (NH 4 Cl) and then calcining the mixture at 550° C for 2 h. The photocatalytic properties were determined by degrading Rhodamine B (RhB) and tetracycline (TC) aqueous solution (10 mg/L, 100 mL). Results show that the crystallinity, size and thickness of g-C 3 N 4 in p-gCN-NS reduced dramatically compared with those in g-C 3 N 4 sample synthesized without the addition of NH 4 Cl (gCN). Specific surface area of p-gCN-NS was 63.65 m 2 ·g −1 , which was 6.7 times that of gCN. After photocatalysis for 50 min, the degradation rate of RhB achieved 99.32% by p-gCN-NS (100 mg), whose reaction rate constant ( k = 0.09317 min −1 ) was 10.6 times higher than that of gCN. p-gCN-NS also exhibited excellent photocatalytic activity for degrading colorless tetracycline aqueous solution. The significant improvement of photocatalytic performance can be credited to the reduced sized and thickness of g-C 3 N 4 , higher specific surface area and pore structure, as well as the weakened recombination rate of photogenerated electron–hole pairs in p-gCN-NS. This work provides a feasible and facile method for synthesis porous g-C 3 N 4 composed of nanosheets with excellent photocatalytic performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Ruijie Chen,Lei Wang,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Photocatalytic CO 2 reduction can simultaneously alleviate the energy crisis and solve environmental issues. Nevertheless, it is still challenging for designing photocatalysts with efficient carrier mobility in rational. Herein, the Bi 2 MoO 6 /g-C 3 N 4 (BMO/CN) heterostructure was constructed through a microwave-assisted which could enhance the construction of two-dimensional and two-dimensional (2D/2D) structures. The 2D/2D BMO/CN heterojunction possessed excellent charge separation efficiency which exhibited superior performance on photocatalytic CO 2 reduction. It was shown by the characterization that the (131) surface of Bi 2 MoO 6 was constructed with the (100) surface of g-C 3 N 4 . The work functions of Bi 2 MoO 6 and g-C 3 N 4 were determined to be 4.57 and 4.22 eV, respectively, which suggested the type-II heterojunction was formed. The formation of CO and CH 3 OH over the optimized BMO/CN-30% catalyst reached 2.44 and 3.61 µmol⋅g −1 ⋅h −1 , respectively. The immediate products of HCO 3 - were observed within in-situ FT-IR to further certify the evolution of CH 3 OH. This work highlighted a microwave-assisted strategy to build a heterojunction structure for enhancing photoreduction CO 2 .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yan An,Xiaoping Hu,Xinyu Wang,Jian Tian
Solar energy conversion into hydrogen (H 2 ) energy has attracted much attention. However, the low light utilization rate and fast carrier recombination of photocatalysts extremely limit the practical application of photocatalytic H 2 production. In this paper, MoSe 2 -NiSe with abundant active sites and interfacial electronic structures as dual co-catalysts were assembled on g-C 3 N 4 nanosheets (NSs) vis a solvothermal reaction process. MoSe 2 -NiSe/g-C 3 N 4 NSs composite exhibited improved light absorption and photoelectrochemical properties. The photocatalytic H 2 production rate of MoSe 2 -NiSe/g-C 3 N 4 composite achieved 2379.04 μmol·h −1 ·g −1 , which is 99.25, 1.44, and 3.67 times those of pure g-C 3 N 4 nanosheets (23.97 μmol·h −1 ·g −1 ), MoSe 2 /C 3 N 4 (1654.57 μmol·h −1 ·g −1 ), and NiSe/C 3 N 4 (649.08 μmol·h −1 ·g −1 ), respectively. The apparent quantum efficiency (AQE) value of MoSe 2 -NiSe/g-C 3 N 4 achieved 4.07 % under light at λ = 370 nm. The corresponding characterization and experiments proved that 2D ultrathin g-C 3 N 4 NSs with a large surface area and short charge-transfer distance could facilitate light scattering and the transport of photoexcited electrons. MoSe 2 -NiSe, as a dual co-catalyst, showed strong electronic synergistic interaction between the interfaces, thus improving the conductivity and promoting the electron transfer process.
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