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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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
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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产品关联
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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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
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
JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Zitong Yang,Yunkai Sun,Zexi Hou,Haiyan Yu,Mingxue Li,Yanwei Li,Yude Li,Baoyu Gao,Shiping Xu
Although the effect of Cu 2+ on antibiotic removal during photocatalytic reaction has been studied in depth, there is less known about the effect of antibiotics on Cu 2+ removal. In this study, we report for the first time that, during the photocatalytic purification of sulfamerazine (SMZ) and Cu 2+ combined pollution, Cu 2+ concentration showed an obvious five-stage fluctuation, which was completely different from the simple promotion or inhibition reported in previous studies. By employing HPLC-MS analysis and density functional theory (DFT) calculation, the repeated fluctuation of Cu 2+ concentration was found to be closely related to the SMZ degradation process, mainly resulting from solution pH drop and formation of Cu-containing intermediates which acted as sacrificial agents for Cu 2+ reduction. In addition, compared with the SMZ-free system, the presence of SMZ can greatly enhance the deep removal of Cu 2+ (minimum Cu 2+ concentration was only 0.17 mg/L vs. 1.28 mg/L without SMZ), and there was a wide time interval to ensure the efficient recovery of Cu metal. More interestingly, the in-situ obtained Cu-decorated TiO 2 photocatalyst performed well in water splitting, nitrogen fixation and bacterial sterilization. Results of this study confirmed the great potential of photocatalytic technology in purifying antibiotic-heavy metal combined pollution.
研究领域:
环境科学
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化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
Nature Energy
·
2022
·Vol. 7
·期 11
·1042-1051
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IF 67.439
Zhang Lili,Liu Le,Pan Ziye,Zhang Rui,Gao Zhuoyang,Wang Guangming,Huang Keke,Mu Xiaoyue,Bai Fuquan,Wang Yan,Zhang Wei,Cui Zhonghua,Li Lu
Direct non-oxidative dehydrogenation of alkanes produces useful carbon feedstocks and hydrogen fuel. However, breaking the C–H bonds in alkanes typically requires high temperature, stoichiometric oxidants or high-energy ultraviolet light; processes that operate under milder conditions are attractive but tend to have poor efficiency. Here we report Pt/black TiO 2 photocatalysts in which Pt species are close to each other but not directly bonded, exhibiting high performance for alkane dehydrogenation in visible to near-infrared light at room temperature. For cyclohexane dehydrogenation, the turnover number for H 2 production exceeded 100,000 without any deactivation over 80 reaction cycles, far beyond thermal reactions. For methane, 8.2% conversion was achieved with 65% selectivity to propane, rather than the more common ethane. We propose that methane undergoes intramolecular dehydrogenation to produce a methylene intermediate. For C2+ alkanes, fast dehydrogenation (up to 1,440 µmol g −1 h −1 ) to the corresponding olefins was realized. Distinct from isolated Pt + monomers, the collections of Pt + monomers give better photocatalytic activity and selectivity.
研究领域:
化学
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催化
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材料科学
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能源
✓ 已验证
DOI
高影响因子
ACS Catalysis
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2025
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IF 13.1
Weina Yang,Yachao Wang,Yaxiong Wei,Guofeng Zhao,Weixin Huang,Cong Fu
Photocatalytic oxidative coupling of methane (OCM) offers a sustainable pathway for direct conversion of methane into value-added hydrocarbons, yet faces persistent challenges in balancing efficient methane activation with suppression of overoxidation. Here, we present a TiO2-based photocatalyst decorated with highly dispersed Ag–Co dual sites that achieves superior performance in continuous-flow OCM. The optimized AgCo–TiO2 system demonstrates a remarkable C2 hydrocarbon production rate of 1.7 mmol g–1 h–1 with 91% selectivity while maintaining stable operation for over 30 h. In situ spectroscopic analyses indicate that the introduced Co species induce mobile-charge imbalances, driving the directional transfer of photogenerated electrons and effectively suppressing electron–hole recombination. Coupled with Ag serving as a catalytic center, these effects synergistically enhance O2 activation, C–H bond cleavage, and selective C–C coupling, thereby contributing to the superior catalytic performance. This work provides valuable mechanistic insights into the photocatalytic OCM process, highlighting the pivotal role of precisely engineered charge transfer pathways in enabling efficient methane-to-C2 conversion.
研究领域:
光催化
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材料科学
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化学工程
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环境化学
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能量转换
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Liping Ren,Fanpeng Kong,Xufeng Wang,Yajie Song,Xudong Li,Fang Zhang,Nan Sun,Hanwen An,Zaixing Jiang,Jiajun Wang
The limited stability and the excessive dependence on external heating sources restrict the development of polymer-based solid-state Li-O 2 batteries . Herein, we propose a multifunctional composed cathode with the photo-electro-thermal synergy to achieve a PEO-based solid-state Li-O 2 (PSS Li-O 2 ) battery operating at room temperature. The multifunctional composed cathode consists of the traditional black TiO 2 photocatalyst and carbon cloth (b-TiO 2 /CC). The b-TiO 2 /CC harvests a full spectrum of sunlight, besides the photo-generated electrons and holes enhancing reaction kinetics during discharging and charging processes, though converting solar energy into heat to achieve self-heated replace on external. The photo-electro-thermal synergy-triggered PSS Li-O 2 battery establishes a low overpotential of 0.26 V and long durability of up to 90 cycles, which is a breakthrough for PEO-based Li-O 2 batteries operating at room temperature. A flexible PSS Li-O 2 battery is constructed and exhibits superior flexibility and mechanical stability . The mechanism of the photo-electro-thermal synergy provides a new strategy for PSS Li-O 2 batteries and advances the high-efficiency utilization of solar energy in portable devices.
研究领域:
材料科学
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电化学
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能量存储
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太阳能利用
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2021
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IF 8.198
Jilin Yuan,Ming Chen,Wenhao Xiang,Chuanbao Xiao,Nianbing Zhong,Qiang Liao
Rapid and continuous degradation of toxic organic pollutants and conversion to microalgae biomass are attracting enormous interest for resource recovery and wastewater treatment. Aiming toward this goal, we develop and demonstrate a novel photocatalytic-biological system in which photocatalytic optical hollow fibers coated with the N-doped TiO2 photocatalyst and a Scenedesmus obliquus biofilm cooperatively convert phenol to microalgae biomass. The photocatalytic optical hollow fibers exhibit high UV–visible photocatalytic activity to rapidly degrade phenol and emit visible light for biofilm growth, lipid synthesis, and O2 production. O2 produced as an electron acceptor is transferred to the surface of the photocatalytic optical hollow fibers, limiting electron–hole recombination and generating reactive oxygen species such as •OH and •O2–. Upregulation of nicotinamide adenine dinucleotide + hydrogen and adenosine triphosphate and enrichment of Rhodococcus and Pseudomonas in the biofilm enhance the resistance to phenol toxicity, maintain rapid and stable biofilm growth, and increase lipid content. This photocatalytic-biological system rapidly and sustainably converts phenol to microalgae biomass.
研究领域:
环境科学
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生物技术
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废水处理
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资源回收
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光催化
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）