SURFACE & COATINGS TECHNOLOGY
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2019
·
IF 3.192
Jingcheng Du,Cailong Zhou,Zhijie Yang,Jiang Cheng,Yuanyuan Shen,Xinjuan Zeng,Luxi Tan,Lichun Dong
The economic and green synthesis of metal-organic frameworks (MOFs) is of great significance. In this work, a facile method for preparing HKUST-1 MOFs at room temperature with insoluble Cu 2 (OH) 2 CO 3 particles and film as the precursors was developed. The as-prepared HKUST-1 MOFs were characterized by using the XRD , Raman spectrum , FTIR, XPS and N 2 adsorption-desorption analyses, and the wetting property of the HKUST-1 film was also evaluated. The results demonstrated that the MOF film decorated copper mesh possesses the promising underwater superoleophobicity and underoil superhydrophobicity, with the contact angles of non-wetting liquids larger than 150°. The on-demand oil/water separation was subsequently realized through a prewetting method, obtaining the high separation efficiency up to 97%. The facile route by using solid precursors developed in this work might provide a new strategy for preparing MOFs, and the special wetting properties of the as-prepared materials could enrich the applications of MOF films as well.
研究领域:
材料科学
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化学工程
·
纳米技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zizheng Liu,Jiawei Liu,Haike Yang,Jingyi Guo,Yiqun Chen,Qing Shao,Shuxian Gao,Liting Luo
Arsenic is categorized as a class I carcinogen due to its strong biological toxicity. In this study, a novel treatment process with Cu 2 (OH) 2 CO 3 as catalyst is proposed, whereby As(III) in water is oxidized by activating sulfite to generate SO 4 − and SO 5 − radicals. Under conditions of [Cu 2 (OH) 2 CO 3 ] 0 = 0.01 g·L −1 , [sulfite] 0 = 0.3 mmol·L −1 , and initial pH 8.0, 94% of As(III) was converted into As(V) within 20 min, whereby dissolved oxygen had a pivotal impact on the reaction. However, HCO 3 − , humic acid, and fulvic acid all significantly inhibited the oxidation. Heterogeneous electron transfer on the catalyst surface and homogeneous dissolved Cu 2+ jointly activated sulfite in the Cu 2 (OH) 2 CO 3 /sulfite system, with the heterogeneous process predominating. Density functional theory (DFT) calculations disclose a dominate physical adsorption of sulfite on Cu 2 (OH) 2 CO 3 surface with 1.74 electrons transferred. >90% of As(III) was still oxidized after recycling the material five times, indicating excellent reusability. Overall, it shows good potential for application in the removal of As(III) from real water samples.
研究领域:
环境科学
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化学
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DOI
高影响因子
DALTON TRANSACTIONS
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2017
·Vol. 47
·期 2
·348-356
·
IF 4.029
Hao Xu,Dongsheng Dai,Songsong Li,Lei Ge,Yangqin Gao
Semiconductor-based photocatalytic hydrogen evolution from water with earth-abundant and low cost co-catalysts has attracted much attention. Herein, novel Cu2(OH)2CO3 decorated 2D TiO2 nanosheets for photocatalytic water splitting were synthesized by a facile in situ synthetic method. The chemical and photophysical properties of Cu2(OH)2CO3/TiO2 nanosheets were investigated by X-ray diffractometry (XRD), transmission electron microscopy (TEM), UV-vis diffusion reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV) analysis. At an optimal Cu2(OH)2CO3 loading content of 1.5 mol%, the hybrid photocatalyst delivers a high photocatalytic H2 production rate of 1555.07 μmol g−1 h−1. Such enhanced photocatalytic activity is attributed to tight interfaces formed between Cu2(OH)2CO3 nanoparticles and TiO2 nanosheets, which play a vital role in the separation of photo-excited carriers, and the formation of active Cu1+ and Cu0 species can also benefit the charge separation process by reducing the over-potential of water reduction. Based on the above results, a possible mechanism is proposed and further verified using photoluminescence (PL) spectra. This work may provide more insight into the synthesis of novel Cu2(OH)2CO3/TiO2 nanosheets with high photocatalytic H2 evolution activity for solar-to-chemical conversion and utilization.
研究领域:
材料科学
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光催化
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纳米材料
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能源化学
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半导体物理
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太阳能转化
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Yang Wang,Cuilian Sun,Tianxing Wu,Xiujing Xing,Wei Xiong,Hao Li
The electrocatalytic nitrite reduction reaction (NO 2 RR) converts harmful nitrite in aqueous media into high value-added ammonia (NH 3 ) under mild conditions, representing a promising technology that integrates environmental remediation and green NH 3 synthesis. However, the NO 2 RR undergoes a complex process involving multi-electron/proton transfer steps. Cu-based catalytic systems are universally plagued by the inherent bottleneck of insufficient activity and selectivity, and these dual constraints can hardly be simultaneously overcome by single-element doping alone. Herein, we fabricated fluoride and cobalt co-doped Cu 2 (OH) 2 CO 3 nanosheet catalysts via a one-step hydrothermal method, where the synergistic effect between anionic and cationic dopants enables the simultaneous tailoring of the electronic structure and active site distribution of the material. Electrochemical test results demonstrate that F and Co co-doping can significantly boost the NO 2 RR catalytic performance of Cu 2 (OH) 2 CO 3 . The optimal F-3 sample achieves the highest NH 3 Faradaic efficiency (FE) of 96.47% with an NH 3 yield rate of 28.55 mg h −1 mg cat -1 at −0.8 V (vs. RHE) in 0.15 M NaNO 2 neutral electrolyte, showing a nearly 2-fold performance improvement over the undoped counterpart and outperforming most reported non-noble metal NO 2 RR electrocatalysts. This work provides a high-performance NO 2 RR electrocatalyst for neutral aqueous systems, and demonstrates that anion-cation synergistic doping can break the intrinsic performance bottleneck of Cu-based hydroxyl compounds, offering a valuable modification strategy for rational catalyst design towards electrocatalytic nitrogen-containing pollutant conversion.
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高影响因子
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