CEMENT & CONCRETE COMPOSITES
·
2024
·
IF 10.8
Guangpeng He,Deyu Kong,Xiaoguang Chen,Shujing Fan,Tao Meng,Jiabin Li
In this paper, low-cost dihydrate gypsum (CaSO 4 ⋅2H 2 O) was used as calcium source together with sodium metasilicate solution to prepare calcium silicate hydrate (C-S-H) gels through a mechanochemical activation strategy by using planetary and vibrational ball-milling. The influences of the prepared C-S-H gels on hydrating and hardening properties of super-retarded cement-based materials with sucrose were investigated. The results showed that CaSO 4 ⋅2H 2 O reacted with sodium metasilicate solution under mechanochemical effect during both planetary and vibrational ball-milling, although CaSO 4 ⋅2H 2 O was just slightly dissolved in water. It was also interestingly found that the C-S-H gels can continuously form while resting for a certain time after ball-milling. Under the mechanochemical activation, the prepared C-S-H gels had complete characteristic diffusion peaks and were composed of layered, flocculent and fibrous structures. While incorporating the prepared C-S-H gels into the super-retarded cement paste with sucrose, the cement hydration was greatly accelerated and the compressive strength of the hardened cement-based materials was also effectively improved at early age as expected. Through X-ray diffraction (XRD) analysis, it was found that C-S-H gels can effectively promote the growth of CH crystals along the (001) and (101) crystal planes. The scanning electron microscopy (SEM) results supported that the C-S-H gels inhibited the refinement of ettringite (AFt) crystals in super-retarded HCP with sucrose, which was more obvious at 28 d.
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 12
·1-12
·
IF 3.8
Zhang Ge,Yang Huifen,Lin Xingjie,Miao Yu,Zhang Chi,Li Fangze,Pang Zhikun,Xin Xin
In this work, a novel Ca-Fe-Si-S composite was prepared from thermal desorption residue through FeSO 4 impregnation-pyrolysis. The characteristics and modification process of the composite were specified through a series of analytical methods. And stabilization experiments were conducted to investigate the performance of prepared materials. The optimal Ca–Fe–Si–S composite was obtained at impregnation ratio of 10%, pyrolysis temperature of 900℃ and pyrolysis time of 60 min. The modification process included the dissolution of calcium hydroxide, the formation of gypsum and ferrous silicate, the dehydration of gypsum, the reduction decomposition of calcium sulfate, the decomposition of calcium carbonate and the solid reaction at high temperature. The obtained optimal Ca–Fe–Si–S composite was a multifunctional material mainly composed of high contents of Ca, Fe, Si, S, which corresponding to FeS, CaS, Ca 2 SiO 4 , Ca 3 Al 2 (SiO 4 ) 3 , Ca 3 Fe 2 (SiO 4 ) 3 , Ca 5 (SiO 4 ) 2 SO 4 . The application of 5% optimal Ca–Fe–Si–S composite successfully lowed the leaching concentrations of As, Zn, Cu, Cd in arsenic slag to meet the discharging standard. Meanwhile, the non-specifically bound and specifically bound of As totally decreased by 3.72%, and the acid extractable species of Zn, Cu, Cd reduced by 11.20%, 29.37%, 2.76% respectively. The distribution of stable species for heavy metals significantly increased as united results of surface complexation, chemical precipitation and ion/anion exchange reactions between the prepared composite and heavy metals. The findings of this research provide an effective material for the simultaneous stabilization of multiple heavy metals.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Kailin Wang,Yang Yang,Shumail Farhan,Yan Wu,Wen-Feng Lin
Probing the spatial separation and transport process of photogenerated charges at nanoscale interfaces is essential for understanding catalytic reaction mechanisms on heterostructure photocatalysts. Here, we developed a p-n junction Na 0.6 CoO 2 /g-C 3 N 4 S-scheme photocatalyst via electrostatic self-assembly technology. A significant hydrogen production rate of ∼ 0.294 mmol g − 1 h −1 was achieved on the optimal Na 0.6 CoO 2 /g-C 3 N 4 , which was ten times higher than that of pure g -C 3 N 4 . In-situ XPS shows that the electrons in Na 0.6 CoO 2 / g -C 3 N 4 had different flow directions without and with illumination, demonstrating a built-in electric field being formed through Na 0.6 CoO 2 and g -C 3 N 4 interaction. DFT calculations and ultraviolet photoelectron spectroscopy verified that g -C 3 N 4 and Na 0.6 CoO 2 possess the energy band structures conforming to the heterostructure of S-scheme. In-situ Kelvin probe microscope studies show that Na 0.6 CoO 2 and g -C 3 N 4 both have a self-induced electric field effect, and their combination significantly strengthens the built-in electric field and improves the space separation of photogenerated electrons. Compared with the change of the surface photovoltage of g -C 3 N 4 (60 mV) and Na 0.6 CoO 2 (−30 mV), the average surface contact potential difference of Na 0.6 CoO 2 / g -C 3 N 4 reached 320 mV, yielding a higher efficiency of photogenerated electron separation. This work also provides direct evidence on the existence of a built-in electric field and an electron flow direction for heterostructure photocatalyst materials.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Zhuo Li,EnZhou Liu,Carlota Bozal-Ginesta,HaiXia Ma,HuiYong Chen,Bing Wang
The rational design of stable charge-transfer pathways remains a critical challenge in advancing S-scheme photocatalytic systems. Herein, we demonstrate a hydrogen-bond-engineered dual mortise-and-tenon supramolecular architecture using precisely tailored H 12 SubPcB-OCONapOH (SubPc-5) molecules, which synergistically enhance interfacial carrier dynamics and structural robustness. The SubPc-5/TiO 2 heterojunction, constructed through π-π-directed self-assembly, achieves exceptional photocatalytic degradation of oxytetracycline (90%) and tetracycline (99%) within 180 minutes, outperforming pristine TiO 2 by 3–4.5-fold in reaction kinetics. Multimodal mechanistic investigations, including in situ light-irradiated Kelvin probe analysis, synchronous irradiation X-ray photoelectron spectroscopy (SI-XPS), and density functional theory (DFT) calculations, unambiguously verify the S-scheme charge transfer between TiO 2 and SubPc-5. Theoretical investigations reveal that O 2 molecules adsorbed at the O-site on the TiO 2 (101) surface more efficiently capture photogenerated electrons compared to the Ti-site. This work pioneers a supramolecular engineering strategy for constructing mechanically stable and electronically efficient photocatalytic systems, highlighting the transformative potential of mortise-and-tenon nanostructures in environmental remediation applications.
✓ 已验证
产品关联
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2025
·
IF 8.6
Binghong Wu,Xinru Wu,Dong-Hau Kuo,Xiao Tang,Xin Mao,Baoqian Yang,Zhengjie Su,Pengkun Zhang,Longyan Chen,Minhao Liu,Jinguo Lin,Xiaoyun Chen
To reveal the role of bi-vacancy defects and heterovalent states in oxysulfide catalysts for enhancing the photocatalytic hydrogen evolution reaction (PHER), we demonstrate a Br/W co-doped Zn(O,S) catalyst (labeled as Br/W-ZnOS) featuring abundant anionic oxygen vacancies (V O )/cationic zinc vacancies (V Zn ) bi-defects and heterovalent W 5+ /W 6+ states via a facile hydrolysis method. The co-doping of Br and W induces lattice distortions that enable neighboring atoms to leave the lattice, creating surfaces enriched with anionic V O and cationic V Zn defects. The synergistic effect between dual defects forms an efficient electron-hole separation system, enhancing the efficiency of electron-hole pair separation. Density functional theory calculation (DFT) demonstrates that the combination of Br/W co-doping and vacancies significantly reduces the water dissociation barrier and optimizes the surface ∗H generation rate of the photocatalyst. Thus, Br/W-ZnOS exhibits a PHER rate of 3415.7 μmol h −1 , which is 12.5 times higher than the undoped Zn(O,S) catalyst, and achieves an apparent quantum yield (AQY) of 15.41 % at 365 nm, while maintaining good stability with a PHER activity of 3288.1 μmol h −1 after five repeated cycles. This research provides a promising strategy for designing oxysulfide catalysts with synergistically engineered defects for efficient PHER.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Ping-Fen Yang,Tai-Lei Nie,Xia-Nan Sun,Lan-Xin Xu,Cong Ma,Fang Wang,Li-Hong Long,Jian-Guo Chen
Physical exercise has beneficial effect on anxiety disorders, but the underlying molecular mechanism remains largely unknown. Here, it is demonstrated that physical exercise can downregulate the S-nitrosylation of gephyrin (SNO-gephyrin) in the basolateral amygdala (BLA) to exert anxiolytic effects. It is found that the level of SNO-gephyrin is significantly increased in the BLA of high-anxiety rats and a downregulation of SNO-gephyrin at cysteines 212 and 284 produced anxiolytic effect. Mechanistically, inhibition of SNO-gephyrin by either Cys212 or Cys284 mutations increased the surface expression of GABA A R γ2 and the subsequent GABAergic neurotransmission, exerting anxiolytic effect in male rats. On the other side, overexpression of neuronal nitric oxide synthase in the BLA abolished the anxiolytic-like effects of physical exercise. This study reveals a key role of downregulating SNO-gephyrin in the anxiolytic effects of physical exercise, providing a new explanation for protein post-translational modifications in the brain after exercise.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaoyan Zhang,Wenkang Ni,Xuanyu Yue,Zhijie Wang,Zizhong Zhang,Ke Wang,Wenxin Dai,Xianzhi Fu
Converting CO 2 into CO, CH 4 , and other hydrocarbons using solar energy presents a viable approach for addressing energy shortages. In this study, photocatalysts with S-deficient WO 3 /Zn 3 In 2 S 6 (WO 3 /V S -ZIS) S-scheme heterojunctions have been successfully synthesized. Under UV–vis light irradiation, 20 %WO 3 /V S -ZIS demonstrated significantly improved CO 2 reduction activity and CH 4 selectivity. Detailed characterization and density functional theory (DFT) calculations reveal that the enhanced performance is due to the synergistic optimization of the S-scheme heterojunction and sulfur vacancies (V S ) for CO 2 reduction. The presence of V S aids in the adsorption and activation of CO 2 and enhances the separation of charge carriers. The 2D/2D S-scheme heterostructure assembled with WO 3 nanosheets not only accelerates the migration and separation of photoexcited charge carriers but also improves the adsorption of H 2 O and the formation of V S , thereby increasing the adsorption and activation of CO 2 and facilitating the protonation of CO* to produce CH 4 . This study clarifies the synergistic effect of V S and S-scheme heterostructures in improving photocatalytic performance, offering valuable insights into the photoactivation process of CO 2 at V S in S-scheme heterojunctions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 16
·9871-9885
·
IF 10.7
Longyan Chen,Pengkun Zhang,Dong-Hau Kuo,Jianmei Jiang,Binghong Wu,Zhengjie Su,Osman Ahmed Zelekew,Jinguo Lin,Dongfang Lu,Xiaoyun Chen
Herein, we demonstrate a Co/S doped TiO2 bimetal sulfur oxide nanoparticle catalyst (labeled CoTiOS) with heterovalent Co states and abundant oxygen vacancy (Ov) defects for the photocatalytic nitrogen reduction reaction (PNRR) in an ambient environment. Co/S co-doping converted TiO2 into a catalyst for visible light photocatalytic nitrogen fixation. The incorporation of Co endows TiO2 with better electrical conductivity and electron trapping ability. The introduction of sulfur adjusts the amount of Ov and Co3+/Co2+ ratio. Ov acts as an active site for trapping H2O and activating H2O to generate a proton for the N2 reduction reaction. Active atoms Co3+ were exposed and activated for N2, and electrons hopping between Co2+ and Co3+ enhanced electron transfer. CoTiOS-3 with appropriate Co/S doping has abundant Ov, suitable heterovalent Co3+/Co2+ ratios, higher surface active sites, smaller crystal sizes, higher specific surface area (SBET), and fast transfer of electrons, and it exhibited a super PNRR activity of 491.56 μmol g−1 h−1, an apparent quantum efficiency (AQE) of 1.89% at 420 nm and a solar-to-ammonia (STA) conversion efficiency of 0.083% in pure water under AM1.5G light irradiation. It also exhibited excellent stability and persistence and shows potential for photocatalytic nitrogen fixation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chuangbin Hong,Wenguang Wang,Liangpeng Wu,Jiehang Zhou,Shimin Long,Wentao Zhou,Yuxi Guo
The construction of semiconductor heterojunction is an effective way for charge separation in photocatalytic degradation of pollutants. In this study, a novel MoS 2 @MoO 3 /(Cu + /g-C 3 N 4 ) ternary composites (MMCCN) was prepared via a simple calcination method. The as-prepared composites exhibited exceptional performance in activating peroxymonosulfate (PMS) for the degradation of rhodamine B (RhB). The activity testing results indicated that 99.41 % of RhB (10 mg·L −1 , 10 mL) was effectively removed by the synergistic effect of composites photocatalyst (0.1 g·L −1 ) and PMS (0.1 g·L −1 ) under visible light irradiation for 40 min. Its reaction rate constant exceeded that of Cu + /g-C 3 N 4 , MoO 3 and MoS 2 by a factor of 3.56, 17.30 and 11.73 times, respectively. The crystal structure, band gap and density of states (DOS) of the semiconductors were calculated according to the density functional theory (DFT). Free radical trapping tests and electron spin resonance spectroscopy validated that 1 O 2 , O 2 − and h + are primary reactive species participating in the decomposition of RhB. The ternary composites demonstrated good stability and maintained excellent degradation efficiency even across four reaction cycles. Furthermore, the activation mechanism and the intermediates produced during the decomposition course of RhB by MMCCN/PMS/vis system were analyzed and elucidated. A double S-scheme heterojunctions was responsible for efficient separation of photo-induced electron-hole pairs. This work presents a novel method in the construction of double S-scheme heterojunctions for PMS activation which is expected to find wide applications in wastewater treatment and environmental remediation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Qian Chen,Xiang Wang,Jianyu Liang,Tingting Zhang,Xingwu Jiang,Peifeng Liu
With the emergence of flexible electronics technologies based on stretchable, foldable, and bendable properties, there is a growing need for new thermal interface materials (TIMs) that possess better flexibility and stretchability. Epoxy resins, as thermal management materials commonly used to improve heat transfer and heat transport , need to have high thermal conductivity as well as excellent flexibility and a degree of stretchability. In order to devise TIMs that can be employed with flexible electronic devices, here we propose a strategy to form a flexible thermal conductive network structure with the shape of a “rice plant” inside the flexible epoxy resin matrix . The polyvinyl alcohol (PVA) flexible network skeleton constructed by the electrostatic spinning technique is regarded as the branches of the rice plant, and the ultra-sonicated boron nitride nanosheets (BNNS) are assumed to be the granular rice seeds. As a result, a perfect interconnected thermal conductivity path can be constructed, and the thermal conductivity is greatly enhanced with a relatively low boron nitride loading. Additionally, the prepared EP/PVA@S-BNNSs epoxy composites can exhibit a low elastic modulus and 153 % elongation at the break, demonstrating superior electrical insulation and excellent ductility, making them suitable for a wide range of applications in flexible electronic and wearable devices .
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Huizhen Sun,Xiuhua Chen,Zongdeng Wu,Wenhui Ma,Shaoyuan Li,Chen Li,Dandan Wu,Kaixin Fu,Kexiang Ding
Lead ions (Pb(II)) in industrial wastewater pose a serious threat to the ecological environment and human health due to their toxicity and persistence. Traditional treatment methods often struggle to achieve both efficient capture and sensitive detection of Pb(II). In this study, a novel bifunctional covalent organic framework (BTT-DHBD-COF) with ortho N-S/N-O dual sites was innovatively designed to enable highly selective adsorption and ultrasensitive detection of Pb(II). Adsorption studies revealed that the BTT-DHBD-COF exhibits a high adsorption capacity for Pb(II) (570.7 mg/g at pH 5) and rapid kinetics (equilibrium reached in 10 min). The BTT-DHBD-COF/GCE sensor demonstrated a wide linear detection range (0.0001–0.5 μM) and an ultralow detection limit (0.03 nM). In real water samples (lake water and tap water), it achieved high recovery rates of 96–108 % with relative standard deviations (RSDs) of 2.5–3.45 %. Experimental results and theoretical calculations confirmed that the N-S/N-O dual sites significantly enhance Pb(II) capture and detection through strong coordination (with Pb transferring 0.46 and 0.44 electrons to the N-S and N-O sites, respectively) and efficient electron conduction via the π-conjugated framework. Compared to single binding sites (S: 0.42 e, O: 0.40 e, N: 0.37 e), the significant charge transfer of the dual site highlights its key role. This work presents an innovative bifunctional “adsorption-detection” strategy for the remediation of Pb(II) pollution in industrial wastewater.
✓ 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）