CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Kai Ma,Xingyu Gan,Weichao Li,Laibo Li,Lingchao Lu,Haiming Zhang
Carbon sequestration of cement-based composites is an essential pathway towards the strategic goal of achieving carbon neutrality. However, the efficiency of cement-based composites to sequester carbon dioxide (CO 2 ) is limited. Inspired by legume structure, a sandwich-structured graphene oxide embedded with In(OH) 3 (SGOI) was synthesized to simultaneously enhance the CO 2 sequestration capacity, hydration kinetics, and mechanical performances of cement-based composites. The effect of SGOI content on the CO 2 sequestration capacity, hydration kinetics, and mechanical performances of cement-based composites was evaluated. The results show that the CO 2 sequestration, compressive strength, flexural strength, and eco-mechanical index of the hardened cement paste containing 0.03 wt% SGOI were achieved 52.55 g/kg, 105.1 MPa, 13.9 MPa, and 0.75 kgCO 2 /MPa, representing enhancements of 255.07 %, 32.70 %, 34.95 %, and 167.86 % compared to those of cement paste without SGOI, respectively. Meanwhile, the hydration reaction rate and hydration degree of cement at each stage were improved. The enhancement of these parameters is derived from the structural characteristics of SGOI, including the specific surface area (30.52 m 2 /g), interlayer distance (14.85 nm), and roughness (14.10 nm). One ton of hardened cement paste containing 0.03 wt% SGOI can sequestrate at least 31.09 kg of CO 2 within 28 days, highlighting its significant potential for promoting CO 2 neutrality.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Fubao Gong,Jun Shen,Runhua Gao,Xiong Xie,Xiong Luo
A novel organic–inorganic Mg(OH) 2 /silane surface layer has been developed for corrosion protection of AZ31 magnesium alloy. The results of electrochemical impedance spectroscopy (EIS), the immersion tests, Fourier-transform infrared spectroscopy (FTIR) and sellotape tests showed that the Mg(OH) 2 /silane-based composite surface layer possessed excellent corrosion resistance and very good adhesion due to the formation of Si–O–Mg bond between Mg(OH) 2 layer and silane layer. Electrochemical impedance spectroscopy tests results indicated that for the long-term corrosion protection of AZ31 the increase of the curing temperature improved the impedance of the composited layer when the curing temperature was lower than 130 °С. However, the impedance of the composited layer deceased when the curing temperature was more than 130 °С due to the carbonization of the silane layer.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Shuang Wu,Zheni Wang,Lei Wan,Chenghui Luo,Shams Ali Baig,Xinhua Xu
In the present study, Pd/Ni foam electrode was prepared by improved impregnation method for electrocatalytic hydrodechlorination (ECH) of clofibric acid (CA). The effects of complexing agent addition into the impregnation solution for the formation of Ni(OH) 2 and the ECH activity of Pd/Ni foam electrode were investigated. Results revealed that the introduction of sodium acetate (the complexing agent) greatly enhanced the ECH activity as compared to common impregnation liquid. Characterizations analyses demonstrated that the addition of sodium acetate did not change the phase of the electrode’s surface, but effectively reduced the deposition of Ni(OH) 2 . The surface morphology of the electrode was changed simultaneously by the addition of sodium acetate and the interlacing structure of Ni(OH) 2 and Pd catalyst was formed. NaAc before -Pd/Ni and NaAc after -Pd/Ni foam electrodes were used to perform ECH experiments on CA, and the combined Pd/Ni foam 15 min electrode was compared with the Pd/Ni foam 6 h electrode. After 2 h of electrolysis, the NaAc after -Pd/Ni foam electrode was found to remove the CA (∼100%) in the solution, which was 1.3 times the removal rate of the Pd/Ni foam 6 h electrode to CA and exceeded the Pd/Ni foam 15 min electrode. Findings from the present study demonstrated that adding the complexing agent into the impregnation solution can improve the ECH activity of Pd/Ni foam electrode and achieve a faster and more efficient dechlorination effect of CA.
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OPTIK
·
2018
·
IF 1.191
Zhonghua Wang,Haiqian Zhao,Ming Dong,Xue Cui,Xiaoyan Liu,Yang Liu
It is significant to quantitative test ·OH for understanding the reaction mechanisms of Fenton . OH concentration was directly measured in Fenton system via the spectrophotometric method based on Russell mechanism, and the drawbacks were analyzed. The influences of H 2 O 2 and dimethyl sulfoxide (DMSO, the trapping agent of OH) on the spectrophotometric measurement were studied. The Fe 2+ /Fe 3+ concentrations were tested during the Fenton reaction . The results show that it was difficult to detect ·OH directly in Fenton system. The effect of DMSO on the detection of diazosulfones was related to its concentration. Under most conditions (DMSO concentration was lower than 2000 mmol L −1 ), DMSO did not affect the detection of diazosulfones. The interference of DMSO on the colour reaction was weak. H 2 O 2 had a significant influence on the test result by reacting with methyl radicals, diazosulfones, and disturbing the colour reaction. High concentration of H 2 O 2 was the main reason why OH concentration was hard to be detected in Fenton system. A low concentration of H 2 O 2 was beneficial for decreasing the influence of H 2 O 2 on the measurement. The concentration ratio of Fe 3+ to Fe 2+ remained approximately constant in the Fenton system except during the short initial stage. Based on the analysis, a modified spectrophotometric method for OH concentration test in Fenton system was proposed. In this method, the H 2 O 2 solution was slowly added into the Fe 2+ /Fe 3+ system obtained from the Fenton solution. The test results showed that the ·OH concentration increased linearly with the consumption amount of H 2 O 2 .
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yuanxin Du,Jing Chen,Lin Li,Hongyu Shi,Kangjian Shao,Manzhou Zhu
As a promising new-star electrocatalyst, transition metal phosphide (TMP) has been widely applied in electrocatalytic hydrogen and oxygen evolution reactions (HER and OER). However, the current catalytic activity and stability are unsatisfactory. Herein, we started from optimizing the geometric and electronic structure of the catalyst, choosing FeCo Prussian blue analogues (PBAs) with rich pores as precursors and epitaxially grown Ni(OH)2 and then connecting them though graphene oxide (GO) by electrostatic interaction, and finally transformed them into ternary TMPs and graphene composites (Fe2P/CoP/Ni5P4/RGO). Due to the porous structure of phosphides and the large surface area and excellent conductivity of reduced graphene oxide (RGO), the Fe2P/CoP/Ni5P4/RGO exposed more active sites, promoted electrolyte diffusion and gas release, and accelerated the charge transport. The synergistic effect among ternary TMPs and between them and RGO made Fe2P/CoP/Ni5P4/RGO a highly efficient electrocatalyst for water splitting with only 57 mV, 232 mV overpotential, and 1.56 V cell voltage for obtaining 10 mA/cm2 current density in HER, OER, and overall water splitting. Benefiting from the protection of RGO, the Fe2P/CoP/Ni5P4/RGO remained the original structure and showed good stability during long-term testing. This work proposed a design thought to improve the activity and stability of metal phosphides that may be extended to other metal organic framework-derived compounds and carbon-based materials composites.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2012
·
IF 3.456
Yu Zhang,Ruo Yuan,Yaqin Chai,Xia Zhong,Huaan Zhong
A novel material, sol–gel derived La(OH) 3 nanorods (La(OH) 3 NRs) with excellent film forming ability was prepared, and it was first designed to incorporate with carbon nanotubes (CNTs) to modify glassy carbon electrode (GCE) to simultaneously voltammetric determine ascorbic acid (AA), dopamine (DA), uric acid (UA), and nitrite (NO 2 − ). Cyclic voltammetry (CV), transmission electron microscopy (TEM), and X-ray diffraction (XRD) were employed to characterize the sensor. Under optimal conditions, the linear response range for AA, DA, UA, and NO 2 − were 0.5 μmol L −1 to 1.46 mmol L −1 , 50 nmol L −1 to 35.36 μmol L −1 , 50 nmol L −1 to 0.79 mmol L −1 , and 0.55 μmol L −1 to 0.72 mmol L −1 , respectively and the detection limits were 1.67 μmol L −1 , 1.67 nmol L −1 , 1.67 nmol L −1 , and 0.18 μmol L −1 . The sensor demonstrated well stability, high selectivity and sensitivity. More importance, this material can be extended to construct other electrochemical sensors by the immobilization of enzymes and antibodies.
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JOURNAL OF ANALYTICAL CHEMISTRY
·
2016
·Vol. 71
·期 9
·891-895
·
IF 0.694
Teng Y. J.,Liu W. H.,Liu J. M.,Nie Y. H.,Li P.,He C. J.
The detection of trace fenthion using surface-enhanced Raman scattering (SERS) was proposed via the OH stretching band of water serving as an internal standard. The adsorption process of fenthion on the silver nanoparticle aggregates was characterized by UV-Visible absorption spectrometry and the optimal adsorption time was about 20 min. The OH stretching band of H 2 O molecule presented around 3100–3500 cm –1 in SERS spectrum was identified by density functional theory and it was not interfered with other characteristic peaks of fenthion. The linearity was obtained from the concentrations divided by the ratio of the benzene ring stretching area around 1073 cm –1 and the internal standard of OH stretching area from 3100 to 3500 cm –1 , while the detection limit was calculated as 0.46 µM. The proposed SERS detection method was used in analyzing lake water sample with the recovery of 94–99%.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Weize Yang,Jianzhong Zheng,Shirong Hu,Wuxiang Zhang,Chan Wei,Peihui Dong,Yaru Yan,Haixia Hu
Three-dimensional (3D) Co2(OH)3Cl-MnO2 hybrid sphere was first obtained through a facile solvothermal microwave-assisted synthesis method. Because of the 3D sphere structure with a flowerlike morphology built up by nanosheets, this type of hybrid accelerated ion transfer as well as the charge and simultaneously maximized the electroactivity of Co2(OH)3Cl or MnO2 with a high capacitance of 942.2 F g–1, which was greater than that of the single Co2(OH)3Cl or MnO2. Meanwhile, an asymmetric supercapacitor device was assembled with the hybrid and active carbon (AC) as the positive and negative electrodes, which yielded a specific capacitance of 49.26 F g–1 and a high energy density of 12.62 Wh kg–1 at a power density of 679.10 W kg–1. In addition, the capacitance of this device retained 83.77% after 5000 cycles, which showed a well-defined, long cycle life.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
·
IF 8.91
Hui Wang,Yan Xiang,Wei Liu,Jiyang Li,Nanwen Zhu,Ziyang Lou
Low-molecular-weight dissolved organic nitrogen (LMW-DON) is an emerging issue in concentrated leachate (CL). Ozonation is crucial to remove LMW-DON, but selectivity mechanisms of different reactive oxygen species were unknown. Here, reactions of O 3 and • OH with LMW-DON at different dosages were determined from composition, unsaturation/redox potential, and precursor-product relationship. The molecular weight of LMW-DON in CL presented a normal distribution and 76.5% was below 450 Da. LMW-DON with 400–1000 Da increased to 55.6%–66.7% and O/C wa increased by over 40.0% due to electrophilic substitution of O 3 . LMW-DON with <400 Da and 550–1000 Da were preferentially degraded by • OH at the low and high O 3 dosage, respectively. O 3 preferred to remove lipid-like (69.1%), protein-like (58.2%), and amino sugars-like (72.8%) LMW-DON, whereas • OH preferred to the refractory LMW-DON, such as carbohydrates-like (71.1%), lignin-like (49.6%), and tannins-like (72.5%) LMW-DON. Forty-three transformation reactions were quantified using mass difference analysis, and O 3 preferred to oxygen addition (e.g., +2O) and conversed amino to nitro groups, and saturated LMW-DON increased via unsaturated bonds rupture. • OH attacked the carbon groups (e.g., –CH 2 ) and nitrogen groups (e.g., –NH 3 +O, –NO 2 +H). These findings provide molecular evidence for the selectivity of oxidants with LMW-DON and improve the ozonation application in wastewater treatment .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 1
·212-220
·
IF 2.324
Hu Zhen,Zhao Li,Guo Haiyong,Wang Shimin,Li Wenlu,Yang Xiaojie,Dong Binghai,Wan Li
A novel composite double-layer film was developed using TiO 2 /La(OH) 3 :Yb 3+ /Er 3+ nanoparticles (P25/UC) and porous-hollow TiO 2 microspheres (PHTS) for highly efficient dye-sensitized solar cells (DSSCs). P25/UC was used as the first layer and coated onto fluorine-doped tin oxide glass substrate to create a good contact and upconversion effect. The P25/UC layer can absorb and convert infrared light into visible red and green light, increasing light utilization. PHTS has a large size and a high specific surface area, was deposited onto the surface of the P25/UC film to improve the light scattering performance and dye adsorption of solar cells. The P25/UC composite double-layer film (P25/UC + PHTS) achieved the highest short-circuit current density of 20.33 mA/cm 2 and photoelectron conversion efficiency of 8.89% due to the synergistic effect of the upconversion layers and light-scattering layers, which increased by 51.26% and 38.04% compared with that of the pure P25 film photoelectrode.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Fenglong Wu,Xiao Tian,Jin Song,Ying Zhang,Wei Li
The activation of the water molecule (H₂O) serves as the rate-determining step for hydrogen (H 2 ) evolution from the photo-assisted hydrolysis of ammonia borane (NH₃BH₃). Therefore, developing a low-cost efficient catalyst that can expedite the cleavage of O H bonds in H₂O is needed for improving hydrogen production efficiency in practical applications. Here, we prepared a supported non-noble metal catalyst (Co/Mo@MoO 2 –200) with a large number of active sites, comprising ultrathin low-crystalline cobalt (Co) nanosheets grown on amorphous molybdenum oxide (MoO 2 )-coated molybdenum (Mo) nanoparticles (Mo@MoO 2 –200), which serves as a high-performance non-noble metal catalyst to accelerate the activation of O H bonds in H 2 O. Notably, visible light irradiation facilitates the formation of ultrathin Co nanosheets by inducing the localized surface plasmon resonance of MoO 2 , as verified by transmission electron microscopy (TEM) images. Moreover, X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) spectra confirm the electron transfer from Co nanosheets to O sites in Mo@MoO 2 –200, establishing robust interfaces. Co/Mo@MoO 2 –200 exhibits high catalytic performance with the turnover frequency (TOF) value of 110.8 min −1 under visible light irradiation, which is greater than that of Co/Mo by 1.21 times and most of the reported Co-based catalysts. DFT calculations reveal that the Mo@MoO 2 –200 support in the catalyst can promote the Co-adsorption of NH 3 BH 3 and H 2 O, while facilitating H 2 desorption. Particularly, the Co/Mo@MoO 2 –200 can significantly decrease the activation energy barrier of the O H bond in H 2 O, compared with pristine Co and Mo@MoO 2 –200. This paper presents a flexible catalyst design strategy for NH 3 BH 3 hydrolysis and other H 2 O-associated catalytic reactions.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Lei Zhao,Zilong Zhang,Tianyuan Zhang,Xiang Wang,Huanjun Peng,Jingdong Peng
The Fenton reaction in advanced oxidation processes is an ideal pathway for the generation of highly reactive hydroxyl radicals (•OH). However, its application in organic wastewater treatment is limited due to the requirement for acidic pH conditions and the additional introduction of H2O2 and Fe2+. In this study, FeOOH–CN/Ni(OH)2 composites were constructed as photocatalysis-self-Fenton catalysts by the amorphous FeOOH, which was uniformly anchored onto the surface of pure g-C3N4 (carbon nitride (CN)), and Ni(OH)2 was assembled on top. In this process, FeOOH–CN/Ni(OH)2 achieved self-sufficiency in H2O2 production while enabling efficient degradation of tetracycline hydrochloride (TCH) over a wide pH range, with a degradation ratio of up to 98.82%, and a first-order reaction rate constant (k) was determined to be 0.04925 min–1, representing a 10.15 times enhancement compared to the pristine CN. A reasonable S-scheme heterojunction charge migration mechanism was demonstrated based on valence-band X-ray photoelectron spectroscopy (VB-XPS), atomic force microscopy (AFM) equipped with a Kelvin probe force microscope, and density functional theory (DFT) theoretical calculations. Furthermore, degradation experiments demonstrated that the catalyst possesses remarkable degradation efficiency for other contaminants as well. On one hand, this significant improvement can be attributed to the formation of an S-scheme heterojunction between Ni(OH)2 and CN, which not only increased the specific surface area of the composite but also remarkably enhanced the separation and transfer efficiency of photogenerated charges. On the other hand, the synergistic effect between Ni and Fe effectively facilitated the activation of H2O2 and promoted the cycling of Fe3+/Fe2+. This study provided an efficient visible-light-driven photocatalysis-self-Fenton system, offering novel perspectives for enhancing Fenton-based processes and advancing the application of Fenton reactions in the treatment of organic wastewater.
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