CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Xuan Hou,Shuhua Ma,Xiaohui Wang,Yanjun Ou,Ruiping Liu
Industrial waste fly ash was transformed into a fluffy C-S-H (hydrated calcium silicate) material with thermal activation process . The textural property of the material makes it easily integrated and well dispersed in cement using 2% addition. Characterization techniques such as hydration heat, XRD , thermogravimetric analysis , were carried out to elucidate the effect of this C-S-H on cement hydration : the compressive strength of cement mortar was improved beyond 25%; and the viscosity of cement paste was reduced by 22%; the volume of solidified cement expand by 10%. This advances the overall utilization of cement and improve the properties as well.
研究领域:
材料科学
·
水泥化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Bo Yu,Yuxuan Wu,Fanming Meng,Qian Wang,Xueqiang Jia,Muhammad Wasim Khan,Caimei Huang,Shuyi Zhang,Li Yang,Hao Wu
Employing photocatalytic technology to promote CO 2 photoreduction into carbon fuels is of great significance to the field of renewable energy. Herein, the hierarchical Bi 2 MoO 6 @In 2 S 3 heterostructured nanotubes rich in surface oxygen vacancies (SOVs) are synthesized by a multi-step control strategy for visible-light-driven CO 2 reduction. The combination of density functional theory (DFT) calculations and in-situ X-ray photoelectron spectroscopy (ISI-XPS) confirms the existence of the S-scheme charge transfer mechanism and SOVs, which will accelerate the separation of charges and ameliorate the redox capability. Additionally, the unique hierarchical hollow architectures also effectively promote the efficiency of light utilization and provide abundant reactive sites. Consequently, the optimized Bi 2 MoO 6 -SOVs@In 2 S 3 heterogeneous nanotubes display remarkable activity under visible light irradiation, with the yield rate and selectivity for CO-generation are 28.54 μmol g -1 h −1 and 94.1%, respectively. This work provides new opportunities for the design of hierarchical hollow heterojunctions with an S-scheme charge transfer mechanism for effective photocatalytic CO 2 reduction.
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jing Wang,Xingyu Niu,Qi Hao,Kun Zhang,Xinyi Shi,Liping Yang,Hui Ying Yang,Jilei Ye,Yuping Wu
Low charge separation efficiency significantly hampers the performance of photocatalytic hydrogen production. Constructing heterojunctions emerges as a crucial strategy to enhance photocatalytic activity by improving charge separation. An S-scheme heterojunction not only effectively separates the photogenerated charge in composite photocatalysts but also preserves optimal redox capabilities. This study presents the first report of CuInS 2 /CeO 2 (CIS/CeO 2 ) and demonstrates how charge separation within CIS/CeO 2 to enhance photocatalytic hydrogen production through the construction of an S-scheme heterojunction. The UV–visible-driven hydrogen production rate of CIS/CeO 2 is 4.6 and 9.4 times higher than that of CIS and CeO 2 alone, respectively. The improved photocatalytic performance primarily stems from enhanced charge separation promoted by the S-scheme heterojunction. The charge transfer pathway was confirmed as an S-scheme mechanism through a combination of band structure experiments, density functional theory (DFT) calculations on work function, internal electric field, and charge differential density distribution, alongside electron paramagnetic resonance (EPR) experiments. Multiple perspectives were employed to elucidate the reasons behind facilitating efficient charge separation. This research provides valuable insights for advancing photocatalytic performance.
研究领域:
材料科学
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光催化
·
能源转换
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Biao Guo,Xianyu Wang,Xia Wu,Xinying Sun,Xinyuan Li,Xinxin Liu,Lijing Zhou,Zhen Zhao
The construction of S-scheme heterojunctions with oxygen vacancies (OVs) is an effective strategy to enhance the photocatalytic activity. In this pioneering study, we successfully fabricated Bi12O17Cl2/Bi2S3 S-scheme heterojunctions with abundant OVs (ROV-BOC/BS) using an anion exchange method. The in situ growth of Bi2S3 (BS) nanorods on OVs-rich Bi12O17Cl2 (ROV-BOC) nanosheets resulted in an interconnected reticulated structure. This structure not only increased the specific surface area of the composite but also established a tightly bound heterojunction, further enhancing the OVs content in the composites. The OVs-induced defect levels provide additional channels for photogenerated charge migration. The synergy between the heterojunction and OVs improved the light absorption and carrier separation efficiency. Consequently, the optimized ROV-BOC/BS-0.1 achieved 95.52% Cr(VI) removal efficiency within 120 min, with apparent reaction rate constants 5.39 and 23.86 times higher than those of pure ROV-BOC and BS, respectively. This investigation provides crucial guidance for designing novel S-scheme heterojunction photocatalysts with abundant OVs.
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
Catalysis Science & Technology
·
2020
·Vol. 10
·期 5
·1368-1375
·
IF 5.721
Cankun Jiang,Lulu Zhang,Fan Gao,Xueyan Huang,Rui Lei,Yun Ye,Jie Yuan,Ping Liu
A CdS@MoOx core–shell nanorod photocatalyst has been constructed by a one-step in situ photodeposition method, which effectively utilizes the photoproduced-hole-induced dehydration and condensation of Mo–O–H derived from the hydrolyzed product of MoCl5, to successfully deposit a layer of MoOx on the surface of CdS NRs. X-ray photoelectron spectroscopy further confirmed that S–Mo bonds serve as bridges for carrier transport between the core and the shell, significantly reducing the interface impedance and improving the carrier transmission efficiency. Due to the superior interfacial carrier separation as well as the enhanced light absorption, the optimal CdS@MoOx-0.9 nanocomposite exhibits a high hydrogen production performance (5.42 mmol g−1 h−1) under visible light irradiation (λ > 400 nm). We have experimentally shed light on the mechanism of this excellent enhancement performance in detail. Moreover, our work can broaden the range of construction and application of developing other photocatalytic materials containing transition metal oxides.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 8
·3745-3757
·
IF 3.3
Litao Jia,Pei Yu,Ying Dong,Yonglei Xing,Juan Peng,Gang Ni,Xiaoyong Jin
The decomposition efficiency of refractory organic pollutants depends strongly on the characteristics of the photoanode semiconductors in the photoelectrocatalytic (PEC) process. The selection of superior materials with excellent PEC efficiency is a challenge in the practical application of PEC oxidation technology. Herein, a novel S-Co3O4/Bi2WO6 heterojunction photoanode was fabricated using a simple hydrothermal procedure. Compared with Bi2WO6 nanoflowers, the as-prepared S-Co3O4/Bi2WO6 photoanode had a large electroactive surface area, low charge transfer resistance, strong light absorption ability, and high separation efficiency for induced photogenerated electron/hole pairs (e−/h+). This relies on the fact that S doping not only controls the morphology of Co3O4 but also changes its intrinsic electronic structure to improve the interlayer polarization. Notably, the Z-scheme heterojunction formed by the combination of S-Co3O4 and Bi2WO6 not only enhances the e−/h+ separation efficiency but also results in a stronger redox ability than that of pure Bi2WO6. In addition, reactive species trapping experiments and electron spin resonance tests demonstrated that the S-Co3O4/Bi2WO6 photoanode plays a dominant role in the degradation of tetracycline (TC) by ˙O2− and ˙OH radicals. Therefore, the prepared S-Co3O4/Bi2WO6 photoanode exhibits better PEC performance than Co3O4, S-Co3O4 and Bi2WO6 in the degradation of TC. The optimized S-Co3O4/Bi2WO6 composite showed a degradation rate of 87.4% in 30 mg L−1 TC solution. This work provides a new strategy for the construction of efficient photoelectroanodes.
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
PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2023
·Vol. 43
·期 6
·1963-1978
·
IF 3.6
Lv Huan,Liu Xinyuan,Hao Yingzi,Yi Yanhui
The industrial utilization of methane to methanol is based on the indirect pathway with syngas as an intermediate product, but the reaction conditions are very harsh and the costs in equipment and operations are extremely high. Therefore, the direct oxidation of methane to methanol (DOMTM) under mild conditions is more desirable. In this paper, coupling of non-thermal plasma and Cu–zeolite (Cu–ZSM-5 and Cu–S-1) catalysts have been studied for DOMTM. The effect of Si/Al ratios (Cu–ZSM-5 and Cu–S-1 catalysts) on the reaction performance has been investigated. Cu–S-1 catalyst exhibited the best catalytic performance, i.e., 5.8% methane conversion and 50.6% methanol selectivity. The employed catalysts have been characterized by XRD, UV–Vis, XPS and FT-IR. The results show that Cu–ZSM-5 catalysts with high Si/Al ratio are conducive to the formation of isolated Cu 2+ species, and Cu–S-1 catalyst exhibits the most abundant isolated Cu 2+ species. Furthermore, Cu–S-1 catalyst shows the most abundant O ads species. The plentiful surface silicon defects on S-1 is the reason why Cu–S-1 catalyst shows the most abundant isolated Cu 2+ and O ads species, and these two species are interdependent to form a Si–O–Cu species, which may be the active site for DOMTM. Based on these findings, the possible catalytic mechanism was proposed.
研究领域:
化学工程
·
催化化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Huiming Zhang,He Bian,Fang Wang,Yaping Li,Lijun Zhu,Daohong Xia
Photocatalytic CO 2 reduction is a practical solution to the energy dilemma and environmental damage caused by greenhouse gases, and it is very important to explore high-efficiency photocatalysts. In this study, a novel Bi 2 WO 6 /C 3 N 5 step(S)-scheme heterojunction was successfully constructed and applied for CO 2 photoreduction. The 2D/2D structure showed excellent photocatalytic properties, with methane production reaching 1.976 μmol·g −1 ·h −1 and selectivity reaching 100 % under 5 hours of visible light irradiation. The result indicates that combining Bi 2 WO 6 and C 3 N 5 can promote interfacial charge separation and maintain the optimal reducing ability of photogenerated electrons. Based on experimental and theoretical calculations, we characterized the reaction mechanism and heterojunction formation mechanism. This study offers a novel approach to improve the selectivity and photocatalytic efficiency of CO 2 reduction products.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qingwei Gao,Jing Ding,Guanshu Zhao,Qingliang Zhao,Lili Li,Xiaoshan Zhao,Lingjun Bu,Shiqing Zhou,Shan Qiu
Sulfate radical-based advanced oxidation processes had been widely applied in the water treatment. In this study, a novel solar-assisted electrooxidation process (SEOP) to activate peroxymonosulfate (PMS) or peroxydisulfate (PDS) was conducted for the degradation of bisphenol S (BPS). The SEOP with persulfate (PS) demonstrated its synergistic effect for BPS degradation, compared with the electrooxidation/PS and the solar process. The hydroxyl radical, sulfate radical ( SO 4 · - ), and singlet oxygen were regarded as primary active species in BPS degradation in SEOP with PS. The transition structure complex ( persulfate* ) on the anode promoted the efficiency of BPS degradation via the non-radical mechanism. The activation of PMS and PDS in SEOP was dominated through radical and non-radical mechanism, respectively. To effectively supplement experimental work with quantum chemical calculation, density function theory (DFT) showed that the active sites mainly focused on the phenol ring of BPS. The energy barrier calculation indicated that BPS was more susceptible to be attacked by SO 4 · - through electron transfer. BPS was mainly degraded by ring-opening, substitution, addition, C–C bond breaking, and decarboxylation reactions. Furthermore, the effective decrease in bio-toxicity of BPS intermediates in SEOP with PS was predicted. Experiments under various current densities, initial concentration of PS, electrolyte, and humic acid suggested the feasibility of SEOP with PS. BPS was degraded with lower energy consumption (0.18 kWh·m −3 ·order − 1 ) in SEOP with PMS than that in SEOP with PDS (0.30 kWh·m −3 ·order − 1 ) and without PS (0.38 kWh·m −3 order − 1 ), respectively. The SEOP with PS poses the feasible, convenient, and economic potential for the degradation of refractory pollutants.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shengwang Chen,Xiaoli Sheng,Yanyun Wang,Pingping Yu,Chenghan Yang,Xian Zhang,Hao Fang,Yiwei Zhang,Yuming Zhou
Nitrogen-rich C 3 N 5 has emerged as a promising visible light catalyst due to its narrow band gap. Nevertheless, its practical application is hindered by the rapid recombination of photogenerated carriers. To address this limitation and enhance the photocatalytic performance of C 3 N 5 -based photocatalysts, one effective measure involves the construction of heterojunctions in conjunction with other semiconductors. In this work, the C 3 N 5 /TiO 2 S-scheme photocatalysts was constructed by matching C 3 N 5 with a more negative conduction band (CB) and TiO 2 with a more positive valence band (VB). Photoelectric tests exhibited that the prepared photocatalysts possessed enhanced visible light photoresponsivity as well as excellent charge separation and transport efficiencies. The characterization results of XPS and EPR confirmed that the existence of internal electric field and the unique S-scheme charge transfer mechanism, which achieves overall spatial separation of effective photogenerated carriers and accelerates the recombination of redundant electrons and holes. The photocatalytic hydrogen production performance of the TCN2 is 6.9 times and 30 times higher than that of C 3 N 5 and TiO 2 , respectively, which is ascribed to the unique charge transfer mechanism of the S-scheme heterojunction and significantly enhanced photocatalytic activity. The simple construction of S-scheme heterojunctions in this work provides a new strategy for research in other fields.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Dan Zheng,Ting-Hong Huang,Cheng Luo,Jing Tang
Three dinuclear Cu(I) complexes, [Cu 2 (pnd)(PPh 3 ) 4 ](BF 4 ) 2 (1) , [Cu 2 (pnd)(dppp) 2 ] (BF 4 ) 2 (2) , and [Cu 2 (pnd)(DPEphos) 2 ](BF 4 ) 2 (3) (PPh 3 = triphenylphosphine , dppp = 1, 3-bis (diphenylphosphino)propane, DPEphos = bis(2-diphenylphosphinophenyl)ether, pnd = N , N ’-bis (pyridin-2-ylmethylene)naphthyl-1, 5-diimine), have been prepared and characterized by IR, 1 H NMR, 31 P NMR, 13 C NMR, XRD , elemental analysis and X-ray crystal structure analysis. The structural analysis reveals that the flexible pnd in 1 – 3 acts in a trans bridging coordination mode to connect two Cu + ions, forming a S-shape conformation, while each of Cu (I) ion is four-coordinate N2P2, adopting a distorted-tetrahedral geometry. DFT calculations show that the HOMOs of complexes 1 – 3 are primarily located on the copper d -orbital and the phosphine ligand, together with a specific contribution of pnd, while LUMOs are mostly composed of pnd with admixed Cu(I) d-orbital character. Corresponding calculations of atomic charges indicate that the charge of the copper atom in complexes 1 – 3 is below + 1, while the total charges of the coordinated atoms are 0.743–0.786. Moreover, the solid-state emission spectra of complexes 1 – 3 show the existence of broad emission bands at 350–550 nm.
研究领域:
无机化学
·
理论化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Ze Liu,Yadong Hu,Chengkai Li,Zhenyu Zhang,Tingzhe Shen,Danni Zeng,Rongfeng Guan,Changjian Zhou,Pengyu Dong
Photocatalysis technology can degrade organic pollutants in wastewater, improving the ecological environment and protecting biodiversity. The BiVO 4 stable chemical properties of BiVO 4 make it a robust candidate for photochemical applications. Moreover, its broad light absorption spectrum and optimal band structure further enhance its potential, driving widespread research interest. The introduction of the eco-friendly biperovskite Cs 2 AgBiBr 6 enhanced BiVO 4 ′s surface area and visible light absorbance. Simultaneously, the doping process introduces impurities that modify charge transfer pathways, thereby enhancing the separation efficiency of photogenerated electron-hole pairs. When contrasted with pure BiVO 4 , the W-BiVO 4 /Cs 2 AgBiBr 6 composite demonstrates superior surface area characteristics and exhibits stronger absorption within the visible light spectrum. Within 40 min after exposure to visible light, the efficiency of W-BiVO 4 /Cs 2 AgBiBr 6 photocatalyst to degrade ofloxacin (OFX) and meloxicam (MEL) was 93.15 % and 92.70 %, respectively. Based on the toxicity analyses and antimicrobial assays simulated by the software, no highly toxic substances were found in the degradation intermediate products of OFX and MEL. The catalysts’ energy band structure and photoelectrochemical properties showed that W-BiVO 4 /Cs 2 AgBiBr 6 followed the S-scheme heterojunction charge transfer mechanism. By integrating BiVO 4 with other semiconductors in the form of S-scheme heterojunctions, this study explores a strategy that may effectively improve photocatalytic efficiency, particularly in pollutant degradation applications.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）