COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Qiangbin Yang,Jibin An,Zhonghao Xu,Shuting Liang,Honghong Wang
Due to the carcinogenicity of atrazine, the effective removal of atrazine in water and soil has become the focus of attention. In the paper, the advanced oxidation technology based on sulfate radicals ( S O 4 · - ), which the visible light catalysis and nanocatalyst Co 3 O 4 /g-C 3 N 4 synergistically catalyzed to yield S O 4 · - , was constructed to efficiently degrade and remove atrazine. The Co 3 O 4 /g-C 3 N 4 was prepared through a simple solvothermal method, and its microstructure and composition were characterized by SEM and XRD. A series of experiments were carried out to degrade atrazine by Co 3 O 4 /g-C 3 N 4 activation of peroxymonosulfate under visible light, which revealed that the degradation efficiency reached to 78.5 percent in 35 min, CO 3 2− had a significant inhibitory effect on the degradation of atrazine in coexisting ions of NO 3 -, SO 4 2− , Cl- and CO 3 2− , the e -, ⋅OH, and S O 4 · - were mainly active species. Combined with density function theory calculations of Co 3 O 4 /g-C 3 N 4 , the high-efficiency degradation of atrazine was due to the synergetic enhancement between photocatalysis and Co 3 O 4 /g-C 3 N 4 catalyst in the constructed catalytic system.
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Nanoscience and Nanotechnology Letters
·
2019
·Vol. 11
·期 8
·1093-1103
·
IF 0
Wu Yujie,Zhang Yuting,Gong Yinyan,Niu Lengyuan,Li Can,Liu Xinjuan
Photocatalysis is a green and effective way to degrade antibiotic remnants, one of the main persistent and ecotoxic sources for aquatic environment pollution. Developing highly efficient photocatalysts is a key issue for large-scale application of this technique. In this work, we showed
that layered heterostructure photocatalyst composed of defective g-C3N4 by RbCl-assisted thermal polymerization of melamine (RbCN)/Bi2O2CO3 (BOC) appeared as a promising candidate for photocatalytic degradation of antibiotic pollutants.
The as-prepared RbCN/BOC heterostructure photocatalyst exhibited better photocatalytic activity than bare BOC, and can degrade 84% of tetracycline hydrochloride within 60 min under illumination. The observed improvement is ascribed to enhanced transfer and restrained recombination of free
electron–hole pairs generated under light irradiation as a result of staggered band alignment of RbCN/BOC, extended optical response region, large interface area and possibly more reactive sites associated with RbCl-assisted in-plane structural modification of g-C3N4.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2019
·Vol. 36
·期 2
·236-247
·
IF 2.476
Cui Yanhua,Yang Lili,Meng Minjia,Zhang Qi,Li Binrong,Wu Yilin,Zhang Yunlei,Lang Jihui,Li Chunxiang
A simplified strategy for facilely fabricating antifouling graphite carbon nitride/silver phosphate (g-C 3 N 4 /Ag 3 PO 4 ) nanocomposite photocatalytic polyvinylidene fluoride (PVDF) porous membranes was developed for effective removal of rhodamine B (RhB). g-C 3 N 4 /Ag 3 PO 4 heterojunction was strongly fixed to the interior of the PVDF membranes via phase inversion method. The membrane structure was analyzed by Fourier transform spectrophotometer (FT-IR). The morphology of the prepared membranes was investigated using scanning electron microscopy (SEM), EDX-mapping and atomic force microscopy (AFM), respectively. All prepared nanocomposite photocatalytic PVDF membranes exhibited a typically porous structure, and g-C 3 N 4 /Ag 3 PO 4 nanocomposites were well dispersed inside the membranes. The obtained g-C 3 N 4 /Ag 3 PO 4 heterojunction nanoparticle decorated PVDF membrane had a lower water contact angle of 79° and higher porosity of 85% than that of other two control membranes. The nanocomposite photocatalytic PVDF porous membranes had extremely high permeation flux over 1,083 L·m -2 ·h -1 , and could be used for the removal of RhB. The removal efficiency of g-C 3 N 4 /Ag 3 PO 4 -PVDF membranes towards RhB solution under visible light irradiation reached 97%, higher than that of the pure PVDF membranes (41%) and g-C 3 N 4 -PVDF membranes (85%). Remarkably, the flux performance and flux recovery ratio ( FRR ) of membranes revealed that the g-C 3 N 4 /Ag 3 PO 4 -PVDF membranes could recover high flux after fouling, which presented better fouling resistance. Furthermore, the fabricated antifouling g-C 3 N 4 /Ag 3 PO 4 nanocomposite photocatalytic PVDF porous membranes exhibited excellent recyclability. Therefore, it is expected that g-C 3 N 4 /Ag 3 PO 4 -PVDF membranes could provide an energy-saving strategy for effective removal of organic dyes wastewater and have a great potential for practical wastewater treatment in the future.
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Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 125
·期 2
·1179-1190
·
IF 1.515
Mao Yong,Wu Mingzai,Li Guang,Dai Peng,Yu Xinxin,Bai Zhiman,Chen Peng
For highly efficient photodegradation of organic pollutants, the enhancement of photocatalytic activity of metal-free photocatalyst graphitic carbon nitride (g-C 3 N 4 ) under visible light irradiation is meaningful, but still challenging due to the fast recombination of photogenerated electron–hole pairs, low quantum efficiency and specific surface area of pristine g-C 3 N 4 . To address these challenges, boron-doped g-C 3 N 4 together with nitrogen-vacancies (Bd-Nv-C 3 N 4 ) was designed and synthesized through a simple acid-assisted calcination of melamine without any further tedious operations. As expected, based on the synergistic effect of foreign elements doping (boron atoms doping) and intrinsic defects (nitrogen vacancies), the as-prepared novel Bd-Nv-C 3 N 4 photocatalyst shows lower band gap, higher surface area and separation efficiency of photogenerated electron–hole pairs, achieving a nearly tenfold increase of the phtocatalytic constant for methylene blue (MB) degradation compared to that of pristine g-C 3 N 4 without nitrogen-vacancies and boron-doping. This study provides a new train of thought and method for the design and preparation of nonmetal photocatalysts with enhanced visible light irradiation photocatalytic performance.
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ADVANCED SYNTHESIS & CATALYSIS
·
2016
·Vol. 358
·期 16
·2631-2641
·
IF 6.453
Lingling Wang,Min Yu,Chaolong Wu,Nan Deng,Chao Wang,Xiaoquan Yao
In this contribution, an Ag/g-C 3 N 4 nanocomposite was synthesized and utilized as highly efficient and green photocatalyst for organic reactions under visible light irradiation. A layered, porous g-C 3 N 4 was synthesized following a modified solvothermal-roasting process by using melamine and cyanuric chloride as precursor. Silver nanoparticles (NPs) were well anchored on g-C 3 N 4 nanosheets, which were prepared by a facile impregnation–roasting method. The inexpensive, stable g-C 3 N 4 coupled with the localized surface plasmon resonance (LSPR) effect of Ag NPs exhibited high photocatalytic activities toward aerobic oxidative amidation of aromatic aldehydes under visible light irradiation. Good to excellent yields were achieved for various substrates under the light of a 25 W compact fluorescent light (CFL) bulb in air. The operationally easy procedure provides an economical, green, and mild alternative for the formation of amide bonds.
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Catalysts
·
2025
·Vol. 15
·期 5
·504
·
IF 4
Xiyuan Gao,Pengnian Shan,Weilong Shi,Feng Guo
The development of photothermal-assisted photocatalytic systems with broad-spectrum solar utilization and high charge separation efficiency remains a critical challenge for antibiotic degradation. Herein, we report novel black g-C3N4(BCN) materials synthesized via a one-step thermal copolymerization strategy using C/N precursors and tetrachlorofluorescein. After the introduction of tetrachlorofluorescein, the color of the sample changes, which gives BCN enhanced light absorption and a significant photothermal effect for poorly heating-assisted photocatalysis. The synergistic coupling of photothermal and photocatalytic processes enabled the optimal BCN-U sample to achieve exceptional degradation efficiency (89% within 120 min) for a typical antibiotic (e.g., tetracycline) under an LED lamp as the visible light source, outperforming conventional yellow g-C3N4(YCN-U) by a factor of 1.37. Mechanistic studies revealed that the photothermal effect facilitates carrier separation via thermal-driven electron excitation while accelerating reactive oxygen species (•OH and •O2−) generation. The synergistic interplay between photocatalysis and photothermal effects, which improved mass transfer, ensures robust stability, which provides new insights into designing dual-functional carbon nitride-based materials for sustainable environmental remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xiuyang Zou,Meisheng Li,Huifang Xiao,Shouyong Zhou,Chenglung Chen,Yijiang Zhao
The complex transport mechanism of water and ions in the membrane hinders the design of free standing membranes. The mechanism of the mass transport characteristics of traditional nanofiltration membranes is no longer applicable to free standing membranes due to the change of the driving force in the membrane. In this study, the vacuum filtration of the g-C 3 N 4 suspension was simulated to form a free standing membrane model for the first time by using the molecular dynamics (MD) simulations. In the nanochannels formed by the g-C 3 N 4 nanosheets , the water molecules rapidly penetrated across the free standing membrane due to ultra-low friction. On the other hand, the hydrated Na + and Mg 2+ ions needed energy to partially dehydrate and penetrate across the free standing membrane. Moreover, the MD simulations indicated that the speed of Mg 2+ ions penetrating across the g-C 3 N 4 nanochannels was lower than that of Na + ions. Combined with the computational works, salt retention experiments were conducted to demonstrate the correctness of the proposed model. Further, the developed membranes exhibited excellent non-swelling stability and antibacterial activity in aqueous solutions. The g-C 3 N 4 free standing membranes prepared in this study can effectively realize the separation of monovalent and divalent ions, accompanied with high permeability.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bo Yu,Fanming Meng,Muhammad Wasim Khan,Rui Qin,Xingbin Liu
Traditional bulk photocatalysts often experience serious charge recombination and poor visible-light capturing, resulting in inefficient photocatalytic activity. However, proper nanostructure design usually helps to increase the activity of composite photocatalysts. Here, hollow TiO 2 @g-C 3 N 4 /Co 3 O 4 core-shell microspheres are first reported. The hollow structure of the heterostructured will directionally separate the photogenerated carriers, and the photogenerated holes transferred to the surface will be further captured by Co 3 O 4 to achieve an exposed oxidized surface. The novel multi-stage hollow microspheres can simultaneously achieve effective transfer of photogenerated carriers and extended light absorption. Benefiting from these structural and compositional characteristics, the optimized TiO 2 @g-C 3 N 4 /Co 3 O 4 nanospheres have excellent photodegradation activity for tetracycline and MO. Under simulated sunlight, the degradation rates of TC (10 mg/L) and MO (25 mg/L) at 60 min are 91.6% and 97.8%, respectively. At the same time, high activity is maintained after multiple cycles of testing. Possible transfer paths for photogenerated carriers have also been proposed. This work will provide more inspiration for the design of multi-stage hollow photocatalytic systems.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Wubin Wang,Jin Wang,Yufei Yan,Kaili Huo,Chao Han,Qingyun Zhang
The positively charged nanofiltration (NF) membrane prepared via interfacial polymerization (IP) of polyethyleneimine (PEI) and trimesoyl chloride (TMC) has drawn considerable attention for lithium-magnesium separation, particularly crucial for lithium recovery from salt lakes with high Mg 2+ /Li + mass ratios. However, NF membranes prepared solely from amine monomers have not achieved efficient Li + and Mg 2+ separation. In this study, PEI-g-C 3 N 5 /TMC composite NF membranes were successfully fabricated by mixing amino-rich graphitic carbon nitride (g-C 3 N 5 ) with PEI, followed by the IP reaction of the mixed solution with TMC. Molecular dynamics (MD) simulation results showed that g-C 3 N 5 had an attractive effect on PEI, which led to a decrease in the diffusion rate of PEI, thereby resulting in a thinner separation layer. Density functional theory (DFT) revealed that g-C 3 N 5 competed with PEI, leading to a reduction in the crosslinking within the polyamide (PA) layer and subsequently causing an increase in the surface pore size of the membrane. Besides, the hydrophilicity and positive charge of the modified membrane were both improved. MD simulations, transition state theory, and DLVO principles indicated that the modification of the PA layer by g-C 3 N 5 enhanced the repulsion of Mg 2+ and the transport of Li + during the NF process. This breakthrough effectively overcame the trade-off effect between membrane separation and permeability, especially at a g-C 3 N 5 content of 0.06 wt%, where the lithium-magnesium selectivity coefficient ( S Li, Mg = 18.18) and pure water flux (Flux = 58.59 L m −2 h −1 ) reached the optimum values. Meanwhile, the PEI-g-C 3 N 5 /TMC membrane demonstrated stable separation performance during prolonged filtration and in solutions with varying Mg 2+ /Li + mass ratios. This study not only provides an effective strategy for the design of NF membranes but also expands the application prospects of nanomaterials in the field of membrane separation.
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Arabian Journal of Chemistry
·
2024
·
IF 5.3
Azim Khan,Ruhumuriza Jonathan,Shafiq Ur Rehman,Muhammad Shoaib,Feng Cao,Sajjad Ali,Mohamed Bououdina,Pir Muhammad Ismail,Junwei Wang,Hazem Abu-Farsakh,Yifan Liu,Xian Jian
Enhancement in the visible light absorption and efficient interfacial charge transfer is crucial for optimizing photocatalytic efficiency in the degradation of pollutants such as methyl orange (MO) and formaldehyde. This study focuses on the properties of a TiO 2 /C/g-C 3 N 4 hybrid efficient photocatalyst, which is developed using an air calcination method to deposit graphitic nitride (g-C 3 N 4 ) onto a carbon-modified TiO 2 surface. The characterization techniques, including high-resolution transmission electron Microscopy (HRTEM), X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), were used to provide a comprehensive understanding of the material’s structural, morphological, thermal, and chemical properties. This hybrid catalyst is specifically engineered for the efficient decomposition of methyl orange (MO) and formaldehyde, demonstrating a significant increase in photocatalytic activity. The TiO 2 /C/g-C 3 N 4 photocatalyst also exhibits an enhanced specific surface area of 181.2 m 2 /g, which facilitates increased physical adsorption and photo-catalytic active sites. Experimental results confirm that this catalyst effectively adsorbs MO physically even in the dark without degradation. Combining physical and photo-catalytic functions, this catalyst degrades 94 % of MO within 180 min with the initial concentration 0.2 mol/L of MO, and achieves almost 100 % decolorization of MO under visible light irradiation. Notably, the catalyst retains its high activity after 4 cycles of MO degradation, underscoring its durability and consistent performance. Additionally, the hybrid catalyst features a staggered type-II energy level configuration, which effectively enhances charge separation and boosts photocatalytic efficacy. The incorporation of an ultrafine carbon layer further augments electron mobility towards the surface, crucial for effective catalytic reactions. This study paves the way for future development of highly efficient photocatalytic materials for environmental purification.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ke Xiang,Shaoyi Wu,Tiefeng Xu,Wangyang Lu
The photocatalysis-assisted peroxymonosulfate (PMS) activation process has shown great potential for organic wastewater treatment. Herein, the composite photocatalyst (FeTAPc/PDI/CN) was obtained by grafting graphitic carbon nitride (CN) and amino iron phthalocyanine (FeTAPc) onto both ends of perylene tetracarboxylic anhydride (PTCDA) through an imidization process. Under simulated solar irradiation, the catalyst exhibited a remarkable degradation performance toward the target pollutant by activated PMS over a wide pH range from 3 to 11. The degradation efficiency of SMX reached 100 % in 7 min with the reaction kinetic constant of 0.845 min −1 , which was 13 times higher than that of pure CN. In addition, the removal rate of FeTAPc/PDI/CN-4 for SMX was more than 80 % after 9 cycles. The introduction of phthalocyanine and PDI improved the separation efficiency of photogenerated electron-hole pairs. Furthermore, the active species involved in the SMX degradation were identified as •OH, SO 4 • - , •O 2 – and 1 O 2 . The possible degradation pathways were proposed based on the identified intermediates, in which the oxidation of the amino group on the benzene ring was the main degradation pathway. This study is anticipated to result in a favorable method for designing CN-based photocatalysts with high stability and excellent catalytic activity for environmental remediation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Feng He,Qianxiang Xiao,Yin Chen,Hongqing Wang,Xiangke Wang
In the photoreduction of U(VI), protective gases and additional sacrificial agents are still the major obstacles. Herein, we developed an oxygen-deficient WO x /g-C 3 N 4 catalyst for the simultaneous reduction of U(VI) and preparation of benzaldehyde by selective oxidation of benzyl alcohol without protective gases and sacrificial agents. The removal of U(VI) by WO x /g-C 3 N 4 could reach 98.5% and the conversion of benzyl alcohol was nearly 32% with a selectivity close to 100%. Compared with single g-C 3 N 4 and defect-free WO 3 , the photoreduction activity of WO x /g-C 3 N 4 was 10.4 and 7 times higher, respectively. Besides, the role of oxygen and oxygen defects was explored. Owing to oxygen defects in the catalyst, oxygen was adsorbed on the oxidation end (WO x ) of the catalyst and activated without entering the reduction end to interfere with the photoreduction of U(VI), while favoring the generation of •O 2 - to improve the selectivity of benzaldehyde. Finally, a new mechanism was proposed.
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