ACS Applied Materials & Interfaces
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2022
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IF 10.383
Lei Lei,Deyu Wang,Yongfu Kang,Yoann de Rancourt de Mimérand,Xiaoyun Jin,Jia Guo
The combination of a phosphor with semiconductor photocatalysts can provide photoactivity in the dark. Indeed, the phosphor acts as a “light battery”, harvesting photons during irradiation and later re-emitting light that can be used by the catalytic phase when in conditions of total darkness. This allows for continued activity of the composite catalyst, even in conditions of unstable light stimulation. In this study, we assess the use of a heterojunction, namely graphitic-C3N4/Ag3PO4, that enables efficient photoactivity specifically under visible light stimulation, in combination with a phosphor that exhibits green–blue phosphorescence (510 nm), that is SrAl2O4:Eu2+,Dy3+. Our findings showed that this combination was particularly interesting, noticeably displaying significant photoactivity in darkness, after short periods of activation by visible light. After finding the right combination and optimal ratios for maximum efficiency, the resulting catalyst composite was immobilized on resin supports with a fractal surface, printed by LCD-SLA 3D printing. The immobilization was effectuated via an aqueous-phase plasma-aided grafting (APPAG) process, using cold plasma discharge (CPD) and using vinylphosphonic acid (VPA) as a coupling agent. Whereas the colloidal photocatalyst displayed a serious problem of partial physical separation between the catalytic phase, g-C3N4/Ag3PO4, and the phosphor, the immobilization of the composite catalyst on polymer supports allowed solving this issue. Photodegradation assessments confirmed that the hybrid supported phosphor-enhanced catalyst was active, notably in dark conditions, as well as fairly photostable. This study offers new prospects for the fabrication of polymer-based panels for water purification, with round-the-clock activity and that are, in addition, extremely easy to recover and reuse, by comparison with colloidal catalysts.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2019
·Vol. 36
·期 2
·236-247
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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.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 23
·15551
·
IF 4.614
Renguo Liu,Xue Li,Jinhui Huang,Haoliang Pang,Qiongfang Wan,Kun Luo,Ya Pang,Lingyu Wang
g-C3N4/Ag3PO4/TiO2nanocomposite materials were loaded onto a polyvinylidene fluoride (PVDF) membrane using a phase inversion method to obtain a photocatalytic flat membrane for dye removal. The morphology, structure, and photocatalytic activity of the g-C3N4/Ag3PO4/TiO2nanoparticles and composite membrane were evaluated. The g-C3N4/Ag3PO4/TiO2/PVDF membrane exhibited superior morphology, hydrophilic properties, and antifouling performance compared with the raw PVDF membrane. Four-stage filtration was performed to evaluate the self-cleaning and antifouling capacity of the g-C3N4/Ag3PO4/TiO2/PVDF membrane. Upon irradiating the composite membrane with visible light for 30 min, its irreversible fouling resistance (Rir) was low (9%), and its flux recovery rate (FRR) was high (71.0%) after five filtration cycles. The removal rate of rhodamine B (RhB) from the composite membrane under visible light irradiation reached 98.1% owing to the high photocatalytic activity of the membrane, which was superior to that of raw PVDF membrane (42.5%). A mechanism of photocatalytic composite membranes for RhB degradation was proposed. Therefore, this study is expected to broaden prospects in the field of membrane filtration technology.Keywords:g-C3N4/Ag3PO4/TiO2nanocomposite;photocatalytic membrane;self-cleaning;membrane fouling;dye
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
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2022
·
IF 7.613
J. Lu,Y.-Y. Qin,Y.-L. Wu,Z. Zhu,M.-N. Chen,Y.-S. Yan,C.-X. Li
Since the in-depth exploration of molecularly imprinted membranes (MIMs), compatibility between high selectivity and superior regeneration has been always the focus. Here we propose, based on biomimetic self-polymerization of dopamine, highly specific, self-cleaning, and interfacial-stable g-C 3 N 4 /Ag 3 PO 4 /PDA-composited molecularly imprinted membranes (C/A/D-MIMs) for enhanced treatment of fit-for-purpose water. Ciprofloxacin (CFX) was selected as a representative target because of its potential toxic effect on the microorganism, which will inevitably weaken the traditional biological-based water treatment. Besides superior antifouling performance, remarkable permselectivity ( β NFX/CFX = 1.65, β EFX/CFX = 1.90, and β OFX/CFX = 2.08) and flux regeneration rate (84.4% after photo-regeneration) could be ascribed to (i) effective formation of molecularly imprinted sites by self-polymerization of dopamine, (ii) synergism of polydopamine in constructing Z-scheme heterojunction configuration, as well as (iii) bio-adhesion of polydopamine in coupling photocatalyst and MIMs. Achievements in the present work will promote the development of highly specific and self-cleaning MIMs with considerable stability and applications in specific and selective separation.
研究领域:
材料科学
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环境工程
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化学工程
·
水处理
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产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 30
·e01615
·
IF 2
Bing Wang,Pinliang Lai,Jian Zhang,Guomin Li,Rao Fu,Hui Liu
Graphical The AgPCN+APS photocatalytic system was constructed in situ and its performance in degrading dyes in complex water environments was systematically investigated. It is of vital importance to develop highly efficient photocatalysts capable of removing dyes from actual wastewater environments. In this study, we constructed a in-situ, novel P-doped g-C 3 N 4 /Ag 3 PO 4 Z-scheme heterojunction photocatalyst (AgPCN) to degrade rhodamine B(RhB) in wastewater activated by persulfate (APS). Without the addition of persulfate, the kinetic degradation constant of RhB degraded by AgPCN can reach 0.53619 min −1 . Under the activation with a specific amount of persulfate, the kinetic degradation constant of RhB in the AgPCN + APS photocatalytic system can reach 0.78844 min −1 , which is 1.47 times higher than that of pure AgPCN. This is attributed to the structural defects of AgPCN itself and the energy level transformation caused by doping. Additionally, the activation of APS stimulates the generation of free radicals such as SO 4 · 2− , O 2 · − , and ·OH during the degradation process of AgPCN. It is worth noting that the AgPCN + APS system has a wide pH tolerance, indicating its application potential in complex actual wastewater environments. After three cycles of experiments, it still maintained a degradation efficiency of over 95%. Therefore, the AgPCN + APS system features excellent stability and wide applicability, providing a promising technical approach for the industrial treatment of dye wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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光催化
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水处理技术
✓ 已验证
产品关联
DOI
高影响因子
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