JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Ziang Min,Qing Tian,Zhuanzhuan Shi,Xiangyu Ding,Chunxian Guo,Chang Ming Li,Xiaoshuai Wu
Microbial Fuel Cells (MFCs) have garnered significant research attention as promising candidates for efficient and eco-friendly energy storage solutions. However, the persistent obstacle of limited electron transfer efficiency continues to hinder their widespread adoption. This study innovatively tackles the challenge of low electron transfer efficiency in MFCs by copolymerizing a conjugated polymer (PDA) with a photocatalytic material (TiO 2 ) onto Shewanella putrefaciens CN32 to create a hybrid microorganism. These hybrids, particularly when utilized as catalysts within MFCs under light illumination, significantly boosted electron transfer rates. Remarkably, the hybrid microorganism demonstrated an impressive current density of 1.07 mA/cm 2 in darkness, which soared to 5.657 mA/cm 2 under illumination. This microorganism exemplifies the synergistic interplay between the PDA and TiO 2 , where the PDA serves as an electron accumulator, while TiO 2 converts photons into valuable energy, ultimately enhancing the overall electrochemical performance of the MFCs. This work not only underscores the potential of integrating conjugated polymers and photocatalytic technology within bioelectrochemical systems but also expands the avenues for the development of more efficient and sustainable MFCs.
研究领域:
生物技术
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环境科学
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能源研究
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DOI
高影响因子
CATALYSIS LETTERS
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2020
·Vol. 151
·期 7
·1961-1975
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IF 2.482
Wei Congcong,Zhang Wei,Wang Xinpeng,Li Aihong,Guo Jianping,Liu Bo
Abstract Here, g-C 3 N 4 /TiO 2 photocatalysts with mesoporous structure and intimate interfacial connection were synthesized via the facile pyrolysis of g-C 3 N 4 /MIL-125 composites. The photocatalytic H 2 evolution reaction was performed to examine the photocatalytic activity of obtained photocatalysts. Under the UV–vis light irradiation, the average H 2 evolution rate of g-C 3 N 4 /TiO 2 sample with optimal g-C 3 N 4 loading content (4.12wt%) was most increased by up to 0.606 mmol·g −1 ·h −1 , a value which transcended that of as-prepared g-C 3 N 4 (0.138 mmol·g −1 ·h −1 ) and mesoporous TiO 2 (0.244 mmol·g −1 ·h −1 ) by a factor of 4.41 and 2.48, respectively. The improvement in photocatalytic activity of g-C 3 N 4 /TiO 2 composites was explained by the synergistic effect between large specific surface area, decreased energy band gap and intimate interface contact. This study demonstrated a new approach for the preparation of binary mesoporous heterojunction photocatalysts. Graphical Abstract
研究领域:
材料科学
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光催化
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DOI
高影响因子
Journal of the American Chemical Society
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2014
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IF 11.444
Xibin Pang,Wei Chang,Chuncheng Chen,Hongwei Ji,Wanhong Ma,Jincai Zhao
The molecules O2 and H2O dominate the cleavage of aromatic sp2 C–C bonds, a crucial step in the degradation of aromatic pollutants in aqueous TiO2 photocatalysis, but their precise roles in this process have remained elusive. This can be attributed to the complex oxidative species involved and to a lack of available models for reactions with a high yield of direct products. Here, we used oxygen-18 isotope labeled O2 and H2O to observe the aromatic ring-opening reaction of the model compound 3,5-di-tert-butylcatechol (DTBC), which was mediated by TiO2 photocatalysis in an aqueous acetonitrile solution. By analyzing the primary intermediate products (∼75% yield), especially the seven-membered ring anhydrides that were formed, we obtained direct evidence for the oxygen atom of dioxygen insertion into a C–C bond of the aromatic ring. This indicates that molecular oxygen is the ultimate ring-opening agent in TiO2 photocatalysis and that it undergoes single O atom incorporation rather than the previously proposed molecular oxygen 1,2-addition processes. The ratio of intradiol to extradiol products depends on the particle size of TiO2 catalysts used, which suggests that the O2 activation is correlated with the available coordination sites on the TiO2 surface in the photocatalytic cleavage of the aromatic ring.
研究领域:
环境科学
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化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Shangyuan Ni,Zhengrong Fu,Lin Li,Manying Ma,Yuelin Liu
Construction of heterojunction between semiconductors is considered an effective strategy for enhancing photocatalytic capability. Herein, this work prepared an abundant porous g-C 3 N 4 /TiO 2 photocatalyst , with the two-dimensional (2D) nanosheet g-C 3 N 4 and nanoparticle TiO 2 . The heterojunction both enhanced the ultraviolet (UV) light absorption ability, and inhibited the recombination of photogenerated electron-hole (h + ) pairs. As expected, the optimal 4 % g-C 3 N 4 /TiO 2 (g-C 3 N 4 :TiO 2 = 1:25) exhibited a prominent degradation efficiency of 96.53 % in the photocatalytic performance of tetracycline hydrochloride (TCH) under UV irradiation . The recycling of the heterojunction photocatalyst g-C 3 N 4 /TiO 2 remained stability and reusability. The main active species were·O 2- , h + and·OH, and the formation of internal electric field on the step-scheme (S-scheme) heterojunction interface accelerated the migration of photogenerated carriers. Moreover, several environmental factors on degradation such as dose, pH, and the initial concentration of TCH were investigated. This work could be spread to the conceive of other S-scheme heterojunction photocatalysts in application to different environmental demands.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Zhaoyi Li,Zhen Sun,Guan Zhang
Solar reforming cellulosic biomass into hydrogen is an attractive research topic for sustainable biomass waste utilization and renewable energy development. To exert the advantages of enzymatic catalysis and heterogeneous photocatalysis , a glass fiber membrane integrated process that combines enzymatic hydrolysis of cellulose with sacrificial photocatalytic H 2 production from water under mild condition has been proposed as an example of integrating enzymatic catalysis and heterogeneous photocatalysis. Specifically, a low−cost Cu 0.5 Ni 0.5 −TiO 2 photocatalyst has been developed with presenting remarkable H 2 production performance even comparable with Pt−TiO 2 under UV light irradiation. The synergistic effect of Cu and Ni co−deposition onto TiO 2 has been found to improve the photocatalytic H 2 production. The condition for enzymatic hydrolysis of cellulose to generate glucose has been optimized in terms of reaction temperature, solution pH, types of cellulase and inorganic ions in order to obtain higher yields of glucose. To integrate the enzymatic catalysis and photocatalysis together, the glass fiber membrane with superior glucose penetration capability has been screened out. Lastly, the coupling of photocatalytic H 2 production from water based on the Cu 0.5 Ni 0.5 −TiO 2 photocatalyst and enzymatic hydrolysis of cellulose has been quantitively evaluated in both mixed and membrane−separation systems. The membrane−separation system can avoid the depletion of cellulase activity induced by photocatalytic oxidation , and thus presents higher H 2 production efficiencies with apparent quantum efficiency of 3.07 % at 365 ± 10 nm irradiation in initial 5 h. This work demonstrates that inorganic membrane integrated enzymatic catalysis and photocatalysis can be a powerful tool for different potential applications.
研究领域:
环境科学
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生物化学
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材料科学
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2019
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IF 1.901
Hongwei Feng,Hui Xu,Hongtu Feng,Ying Gao,Xinyuan Jin
The sol-gel method was used to synthesize Gd-SiO 2 -TiO 2 composite photocatalysts. When the doping amounts of Si and Gd reached 9.1 mol% and 0.2 mol% respectively, the sample showed the optimal photocatalytic activity during the methylene blue (MB) degradation. When the calcination temperature was lower than 550 °C, Gd-SiO 2 -TiO 2 photocatalyst has an anatase crystal structure. After doping of Si and Gd, the absorption wavelength thresholds of the sample approached 407 nm with the energy gap of 3.05 eV. Gd-SiO 2 -TiO 2 photocatalyst showed the degradation efficiency about 90% to methylene blue (MB) under irradiation of simulated sunlight.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jin Wen,Xiaoke Li,He Zhang,Size Zheng,Caini Yi,Liu Yang,Jinwen Shi
Solar-powered water distillation is one of the effective and promising ways of water purification. However, new high-efficiency evaporators are especially needed to reduce the energy requirement and improve water yields under natural sunlight. In this study, a Janus structured hydrogel with an interpenetrating double network was formed by polyvinyl alcohol and natural polysaccharide to speed up solar water purification. Due to its unique pore structure, water molecules can quickly escape from the surface of Janus hydrogel by molecular dynamics simulations. The Janus evaporator worked stably and the evaporation rate was achieved to 3.53 kg·m −2 ·h −1 under 1 sun illumination, which was attributed to the outstanding water transport capacity and thermal localization capacity. Meanwhile, the Janus-based solar evaporator exhibited excellent durability in wide acid–base range (pH 1–13) and salinity range (0–350‰), and long term (30 days). The daily yield of the Janus hydrogel reached 24.5 kg·m −2 ·h −1 in outdoor tests. The Janus evaporator enables efficient desalination and purification of other unconventional water sources, and can degrade more than 95% of organic dyes (trypan blue and Congo red) as a result of the synergistic effect of Polydopamine (PDA) /TiO 2 nanoparticles. This Janus structured hydrogel evaporator opens up potential applications in desalination and wastewater treatment.
研究领域:
材料科学
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环境科学
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能源工程
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产品关联
DOI
高影响因子
Catalysts
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2018
·Vol. 8
·期 12
·628
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IF 3.465
Lei Wang,Changbo Zhang,Rong Cheng,Jafar Ali,Zhenbo Wang,Gilles Mailhot,Gang Pan
Cyanobacterial blooms can cause serious damage to aquatic ecosystems. However, we have demonstrated that typical algae-blooming speciesMicrocystis aeruginosa (M. aeruginosa)combined with photocatalysts could synergistically facilitate the photodecontamination of tetracycline hydrochloride (TC) and Cr(VI). In this study, for the first time, harmful algae were successfully converted into photoreactive bionano hybrid materials by immobilizingM. aeruginosacells onto polyacrylonitrile (PAN)-TiO2/Ag hybrid nanofibers, and their photocatalytic activity was evaluated. The addition ofM. aeruginosasignificantly improved the photodecontamination, and the reaction rate constant (k) values of TC and Cr(VI) degradation byM. aeruginosa-PAN/TiO2/Ag nanofiber mats were 2.4 and 1.5-fold higher than that of bare PAN/TiO2/Ag nanofiber. Photoreaction caused damage to algae cells, but no microcystin was found that had been photodegraded simultaneously. The effects of various active species were also investigated, and the photodegradation mechanism was proposed. Recycling tests revealed that this flexibleM. aeruginosa-PAN/TiO2/Ag hybrid mat had potential application in the removal of mixed organic and inorganic pollutants with high efficiency and without secondary pollutants. Thus, harmful algae blooms could serve as an efficient materials to remove toxic pollutants in a sustainable way under visible light irradiation.Keywords:Microcystis aeruginosa;PAN nanofiber;TiO2photocatalytic;Ag nanoparticles;tetracycline;Cr(VI)
研究领域:
环境科学
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生物技术
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DOI
高影响因子
Catalysts
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2024
·Vol. 14
·期 10
·735
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IF 3.8
Lu Qiu,Hanliang Li,Wenyi Xu,Rongshu Zhu,Feng Ouyang
The organic pollutants discharged from industrial wastewater have caused serious harm to human health. The efficient photocatalytic degradation of organic pollutants under sunlight shows promise for industrial applications and energy utilization. In this study, a modified TiO2photocatalyst doped with bismuth (Bi) and fluorine (F) and composited with SnO2and SiO2was prepared, and its performance for the degradation of Rhodamine B (RhB) under simulated sunlight was evaluated. Through the optimization of the doping levels of Bi and F, as well as the ratio of SnO2and SiO2to TiO2, the optimal catalyst reached degradation efficiency of 100% for RhB within 20 min under simulated sunlight, with a first-order reaction rate constant of 0.291 min−1. This value was 15, 41, 6.5, and 3.3 times higher than those of TiO2/SnO2, Bi/TiO2, Bi-TiO2/SnO2, and F/Bi-TiO2/SnO2, respectively. The active species detection showed that h+was the most crucial active species in the process. The role of Bi and F addition and SnO2-SiO2compositing was investigated by characterization. Bi formed a chemical bonding with TiO2by doping into TiO2. The absorbance intensity in the UV and visible light regions was improved by SnO2and F modification. Composite with SiO2led to a larger surface area that allowed for more RhB adsorption sites. These beneficial modifications greatly enhanced the photocatalytic activity of the catalyst.
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
Journal of Cleaner Production
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2020
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IF 7.246
Nan Wang,Xing Li,Yanling Yang,Zhiwei Zhou,Yi Shang,Xiaoxuan Zhuang
Various pretreatments of raw surface water before ultrafiltration (UF) to retard membrane fouling due to natural organic matter (NOM) were compared in this study. Water treatment by conventional coagulation, visible light irradiation with the presence of a novel photocatalyst of Bi 2 O 3 –TiO 2 supported onto powder activated carbon (Bi–Ti/PAC), and their combination were compared in terms of removal of NOM and the optimal conditions were determined. The composite nano-photocatalyst of Bi–Ti/PAC could function as a pre-oxidant and a flocculation core assisting coagulation. Experiments results show that 58% of the NOM present could be removed by quantization of dissolved organic carbon in the combination treatment under optimal conditions of 2.0 g/L of photocatalyst dosage with light exposure of 20 min and 0.04 mmol polyaluminium chloride coagulant dosage with a solution pH of 7. The combined pretreatment with UF produced a reduction of 88% in total membrane fouling, with reversible and irreversible fouling being significantly decreased because of the removal of hydrophilic , protein- and humic-like substances, along with degradation and removing of medium-molecular weight (MW) and high-MW compounds into smaller molecules. Models used to fit the generated data indicated that the provided combined pretreatment had largely reduced standard blocking of the membrane pores. The effectiveness of the pretreatment was confirmed by characterization of the hydraulic irreversible organic foulants. This work demonstrated the potential advantages of combining photocatalysis with coagulation as a pretreatment of raw surface water and subsequent UF in simultaneously controlling membrane fouling and improving the permeate quality.
研究领域:
环境科学
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水处理工程
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产品关联
DOI
高影响因子
Toxics
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2024
·Vol. 12
·期 2
·99
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IF 3.9
Jintao Yu,Yuning Xuan
Volatile organic compounds (VOCs) are prevalent soil contaminants. During the ex situ soil remediation process, VOCs may overflow from the soil and cause gas to diffuse into the atmosphere. Moreover, some VOCs, such as trichloromethane, are categorized by the EPA as emerging contaminants, imparting toxicity to organs, and the endocrine and immune systems, and posing a huge threat to human health and the environment. To reduce VOCs’ emissions from contaminated soil, aqueous foam suppression is a prospective method that provides a durable mass transfer barrier for VOCs, and it has been widely used in odor control. Based on an aqueous foam substrate, in order to enhance the foam’s stability and efficiency of suppression, SiO2–TiO2-modified nanoparticles have been used as stabilizing agents to improve the mechanical strength of liquid film. The nanoparticles are endowed with the ability to photocatalyze after the introduction of titanium dioxide. From SEM imaging, IR, and a series of morphological characterization experiments, the dispersibility of the SiO2–TiO2-modified nanoparticles was significantly improved under the polar solvent, which, in turn, increased the foam duration. The foam dynamic analysis experiments showed that the foam liquid half-life was increased by 4.08 h, and the volume half-life was increased by 4.44 h after adding the novel synthesized nanoparticles to the bulk foam substrate. From the foam VOC suppression test, foam with modified nanoparticles was more efficient in terms of VOCs’ suppression, in contrast with its nanoparticle-free counterparts, due to the longer retention time. Moreover, in a bench-scale experiment, the SiO2–TiO2nanoparticles foam worked against dichloroethane, n–hexane, and toluene for almost 12 h, with a 90% suppression rate, under UV irradiation, which was 2~6 h longer than that of UV-free SiO2–TiO2nanoparticles, the KH–570-modified nanosilica foam, and the nanoparticle-free bulk foam. XPS and XRD results indicate that in SiO2–TiO2nanoparticles, the proportion of titanium valence was changed, providing more oxygen vacancies compared to raw titanium dioxides.Keywords:volatile organic compounds;emerging pollutants;aqueous foam suppression;nanoparticle silica;TiO2photocatalysis
研究领域:
环境科学
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纳米技术
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土壤修复
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DOI
PubMed
高影响因子
ChemCatChem
·
2022
·Vol. 14
·期 13
·e202200120
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IF 5.497
Hongmei Fu,Haijun Chen,Beibei Gao,Tianliang Lu,Yunlai Su,Lipeng Zhou,Meijiang Liu,Hongji Li,Xiaomei Yang
Graphical Hydrodeoxygenation and reductive etherification of biomass-derived aldehydes were realized on the same Pd/TiO 2 photocatalyst via photocatalytic transfer hydrogenation using aliphatic alcohols as hydrogen donor, and the selectivity was easily switched by the substrate concentration. The development of selectivity control strategies based on external operational conditions without modification of catalyst is an attractive but challenging issue in photocatalysis. Herein we reported the substrate concentration-switched selectivity in photocatalytic transfer hydrogenation of biomass-derived aromatic aldehydes. With the same catalyst, hydrodeoxygenation was realized at low aldehyde concentration and reductive etherification was realized at high aldehyde concentration. Mechanistic studies revealed that the substrate concentration affected the electron density on catalyst, thus controlled the initial reduction of formyl group and types of intermediates. Competitive adsorption of these intermediates on the catalyst affected hydrogenolysis of C−O bonds in the later stage. This method is easy to handle, and achieved selective hydrogenation of diverse bio-based aldehydes to corresponding deoxygenated products and unsymmetric ether products as potential fuel additives under mild conditions. This work sheds light on the effect of substrate concentration on the selectivity in photocatalysis.
研究领域:
催化
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化学工程
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材料科学
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可再生能源
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DOI
高影响因子
危险品化学品经营许可证（带存储）