Scientific Reports
·
2020
·Vol. 10
·期 1
·1-11
·
IF 3.998
Liu Yi,Chen Yan,Zhang Junwei,Gao Junkai,Han Zhi
Copper microsphere hybrid mesoporous carbon (MPC-Cu) was synthesized by the pyrolysis of polydopamine microspheres doped with copper ions that were prepared using a novel, facile and simple one-step method of dopamine biomimetic polymerization and copper ion adsorption. The resulting MPC-Cu was then used as a supporter for polyethylene glycol (PEG) to synthesize shape-stabilized phase change materials (PEG/MPC-Cu) with enhanced thermal properties. PEG/MPC-Cu was studied by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, differential scanning calorimetry and thermal constant analysis. The results demonstrated that the thermal conductivity of PEG/MPC-Cu was 0.502 W/(m K), which increased by 100% compared to pure PEG [0.251 W/(m K)]. The melting enthalpy of PEG/MPC-Cu was 95.98 J/g, indicating that PEG/MPC-Cu is a promising candidate for future thermal energy storage applications. In addition, the characterization results suggested that PEG-MPC-Cu possessed high thermal stability. Therefore, the method developed in this paper for preparing shape-stabilized phase change materials with improved thermal properties has substantial engineering application prospects.
研究领域:
材料科学
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能源工程
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2024
·
IF 1.2
Min Li,Qing Li,Lijie Li,Zixuan Xu,Jie An,Gaohong He,Zhifang Wu,Sijin Li,Wenjun Zhang
Radioactive iodine waste generated from nuclear power and radioactive medical treatments has become a serious environmental issue, raising concerns about public health. Cross-linked chitosan adsorbed iodide anions through electrostatic attraction yet limit-efficiently. To achieve better adsorption performance, chitosan-coated cuprous oxide microspheres (Cu₂O@CM) was proposed via one-step in-situ liquid-phase method. Both Cu₂O@CM-e cross-linked with epichlorohydrin and Cu₂O@CM-g cross-linked with glutaraldehyde, performing rough and spherical morphology, exhibited rapid iodine removal capacities of 0.1843 mmol/g for Cu₂O@CM-e and 0.1819 mmol/g for Cu₂O@CM-g within just 10 min. The adsorption process occurred through a combination of physical multilayer adsorption and chemical monolayer adsorption, driven spontaneously and endothermically. After four regeneration cycles, Cu₂O@CM-e and Cu₂O@CM-g maintained almost identical adsorption efficiencies, highlighting their reusability. Considering the interference of Cl⁻ and CO₃²⁻, both adsorbents showed significant selectivity towards competing ions. Thus, both adsorbents showed promising potential for the removal of iodine waste
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Tiantian Zhao,Jiao Hu,Fengqin Chang,Xusheng Xie,Xue Zhao,Abdukader Abdukayum,Sanshuang Gao,Guangzhi Hu
The electrochemical removal of nitrate (NO 3 − ) from aqueous solutions is a promising strategy for wastewater treatment; however, highly active catalysts are required. In this study, self-supported Cu/copper oxide (CuO) microspheres (ms) on Ni foam (NF) (Cu/CuOms/NF) were fabricated for NO 3 − removal from water using an electrochemical method, achieving a transformation efficiency of up to 99.72 % and N 2 selectivity of 97.97 %. Cu/CuOms/NF also exhibited excellent NO 3 − removal performance over a wide pH range, while maintaining extremely low levels of toxic ammonia residues. The Cu/CuOms/NF-driven NO 3 − removal rate remains as high as 95.45 % even after recycling for five times, demonstrating the remarkable electrochemical stability of the catalyst. The Cu/CuOms supported on NF provided active sites and accelerated the oxidation cycle involving Cl − , leading to the complete transformation of NO 3 − into harmless N 2 gas. Therefore, this study not only achieved the environmentally friendly treatment of NO 3 − pollutants in wastewater but also provided a promising strategy for developing catalysts for electrochemical NO 3 − removal.
研究领域:
环境科学
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材料科学
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废水处理
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DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 30
·11966-11973
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IF 0
Yu Zhang,Pengli Zhu,Liang Chen,Gang Li,Fengrui Zhou,Daoqiang (Daniel) Lu,Rong Sun,Feng Zhou,Ching-ping Wong
Novel hierarchical architectures of porous copper (Cu) microspheres assembled with nanoparticles have been successfully synthesized by ingeniously selecting the precursor and complexant through a facile wet chemical reduction method. The resultant porous Cu microspheres have a size distribution of 700 ± 50 nm and have excellent monodispersity. The synergistic effect between the precursor of slightly soluble copper hydroxide and the complexants of polyacrylic acid and ethanol amine exactly induces the generation of unique porous hierarchical architectures. The obtained porous Cu microspheres were applied to reduce and degrade different organic dyes with high concentrations (4-nitrophenol, methylene blue, and rhodamine B) in the presence of NaBH4. Compared with solid Cu particles that have the same size, these porous Cu microspheres exhibit more excellent catalytic activity due to their hierarchical structures. Moreover, the catalyst with universal applicability could be easily separated from the catalytic system and sustainedly possess high stability in recycled reactions.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
DOI
Journal of Cleaner Production
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2019
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IF 6.395
Yan Chen,Han Ding,Junkai Gao,Xi Tang,Yi Liu,Mouyuan Yang
A novel and efficient strategy was developed for increasing the thermal conductivity of shape-stable phase change materials (ss-PCMs) using in situ reduction of copper ions , and this strategy used carbon-based adsorbents to adsorb and reduce Cu 2+ to form copper microspheres (CMSs) on the surface of the adsorbents, which were then used as the matrix of polyethylene glycol (PEG). Jujube pit biochar (JPB), which was prepared from forestry and agricultural residues of jujube pit by a simple pyrolysis method, was used as the carbon-based adsorbent. The study results demonstrated that the thermal conductivity of jujube pit biochar-based ss-PCMs of PEG/CMS-JPB was 0.630 W/m K, which is a 125% increase over the value of PEG (0.280 W/m K), and PEG/CMS-JPB possessed a favourable phase change enthalpy of 108.2 J/g. Additionally, according to the thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR), and X-ray diffraction (XRD) results, PEG/CMS-JPB possessed excellent thermal stability and had good chemical compatibility between PEG and the carrier. Therefore, the jujube pit biochar that was prepared using agricultural waste could be used as a favourable carrier in the preparation of ss-PCMs, and more importantly, this paper provides a new general approach for improving the thermal conductivity of ss-PCMs.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Fang Wang,Fengna Shi,Jingfang Li,Naipin Chen,Cheng Chen,Ziqi Xu,Jiajun Wang
It is extremely important to simultaneously detection different biomarkers in various biological systems. Hereby, we have developed an original flexible nonenzymatic glucose and uric acid sensor using carbon cloth loaded with copper microspheres (Cu MSs) and ZnO nanoparticles decorated single-walled carbon nanotubes (Cu MSs/ZnO@CNTs/CC). Firstly, ZnO@CNTs was synthesized via sol–gel method, and then Cu MSs were uniformly electrodeposited on ZnO@CNTs/CC substrate rapidly. Morphological and compositional characteristics were examined to confirm the successful decoration of Cu microspheres and ZnO nanoparticles. Importantly, the nanocomposite electrode displayed remarkable electrocatalytic activity for glucose and UA, including wide linear detection range, low detection limit, outstanding sensitivity, respectively. Moreover, the nanostructure biosensor exhibited fast response time (0.1 s) and favorable long-term stability, which are attributed to synergistic catalytic effects: (a) the large specific surface area of CNTs offered abundant sites for the decoration of ZnO nanoparticles, and (b) the rough nanosheets assembled Cu microspheres could expose plentiful active sites. Finally, in practical serum samples, the sensor also exhibits considerably favorable precision and accuracy. As such, the novel flexible Cu MSs/ZnO@CNTs/CC sensor developed with economical and efficient preparation method provided a new easy and sensitive platform for glucose and UA determination in real application.
研究领域:
生物传感器
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材料科学
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电化学
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DOI
高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-12
·
IF 4.38
Wu Shibin,Chen Yan,Chen Zhenshou,Wang Jiaqi,Cai Miaomiao,Gao Junkai
Metal microspheres doping porous carbon (MMPC), which was prepared using in-situ pyrolysis reduction strategy, could enhance the thermal conductivity of shape-stabilized phase change material (ss-PCM) prepared by MMPC as the matrix. However, in previous studies that were reported, the preparation of MMPC needed to synthesize porous carbon by pyrolysis firstly, and then porous carbon adsorbed metal ions was pyrolyzed again to obtain MMPC, which was tedious and energy-prodigal. In this study, a one-step pyrolysis strategy was developed for the synthesis of MMPC through the pyrolyzation of wheat bran adsorbed copper ions, and the copper microspheres doping wheat bran biochar (CMS-WBB) was prepared. The CMS-WBB was taken as the supporter of stearic acid (SA) to synthesize the ss-PCM of SA/CMS-WBB. The study results about the thermal properties of SA/CMS-WBB demonstrated that the introduction of copper microspheres could not only improve the thermal conductivity of SA/CMS-WBB, but also could increase the SA loading amount of wheat bran biochar. More importantly, the CMS-WBB could be obtained by only one-step pyrolysis, which greatly simplified the preparation process and saved energy consumption. Furthermore, the raw material of wheat bran is a kind of agricultural waste, which is abundant, cheap and easy to obtain. Hence, the SA/CMS-WBB synthesized in this study had huge potentialities in thermal management applications, and a simplified method for improving the thermal properties of ss-PCMs was provided.
研究领域:
材料科学
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能源工程
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 44
·35338-35345
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IF 3.84
Junwei Ding,Wei Sun,Gang Wei,Zhiqiang Su
We report here a facile one-step green synthesis of cuprous oxide microspheres (Cu2OMS) on reduced graphene oxide (RGO) by reducing Cu2+ ions and GO with sodium ascorbate synchronously in the presence of sodium hydroxide. Cu2OMS with different sizes on the surface of RGO were successfully synthesized by adjusting the mass ratio of GO to CuSO4·5H2O in this reaction system. It was found that uniform Cu2OMS were formed on RGO by increasing the mass ratio from 1 : 20 to 1 : 80. The synthesized Cu2OMS–RGO composites with different structures were immobilized onto glassy carbon electrodes and applied to construct electrochemical hydrogen peroxide (H2O2) and glucose sensors. The results indicate that the Cu2OMS–RGO composite created with the mass ratio of 1 : 80 presents the best sensor performances. The fabricated H2O2 sensor exhibits a fast amperometric response to H2O2 with a linear detection range from 0.005 to 2.775 mM and a detection limit of 0.0108 mM, and the glucose sensor has a linear detection range from 0.001 to 0.419 mM and a detection limit of 7.288 × 10−4 mM. The superior performance is ascribed to the unique structure of the synthesized Cu2OMS and the excellent conductivity of the RGO content. In addition, the synthesized Cu2OMS–RGO composites exhibited improved electrochemical stability. Such novel Cu2OMS–RGO hybrid materials represent promising non-enzymatic electrochemical glucose and H2O2 sensors with high sensitivity and selectivity, improved stability, and fast amperometric response.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 38
·期 12
·5935-5942
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IF 3.159
Shaoming Fang,Xiaodong Dong,Yuanchang Zhang,Mengmeng Kang,Shunli Liu,Fufeng Yan,Linghao He,Xiaozhong Feng,Peiyuan Wang,Zhihong Zhang
In this paper, we report on the facile one-step synthesis of porous cuprous oxide microspheres on reduced graphene oxide (Cu2OMS–rGO) by synchronously reducing Cu2+ ions and GO with ascorbic acid sodium, followed by their application as electrochemical biosensors for the detection of mercury ions in water. After detailed characterization of the basic chemical components, crystal structure, surface morphology, and electrochemical properties of the Cu2OMS–rGO composites, single-stranded and thymine (T)-rich oligonucleotides were successively immobilized onto the surface of the composite electrode modified by Cu2OMS–rGO. Upon introduction of the target analyte, Hg2+ ions were intercalated into the DNA polyion complex membrane based on T–Hg2+–T coordination chemistry. The results show that the Cu2OMS–rGO composite has high sensitivity for the detection of Hg2+, with a detection limit of 8.62 pM within the range of 0.05 nM to 40 nM. Therefore, the Cu2OMS–rGO composite could be utilized as a novel biosensor for the detection of heavy metal ions in water or in the environment. The strategy yielded excellent selectivity of Hg2+ against other interfering metal ions. In addition, the developed DNA sensor for the determination of Hg2+ ions could be reproduced up to 10 cycles, and the recovery was approximately 95%.
研究领域:
材料科学
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环境科学
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分析化学
✓ 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）