JOURNAL OF THE CHINESE CHEMICAL SOCIETY
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2017
·Vol. 64
·期 11
·1354-1359
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IF 0.935
Wangping Huang,Jinhui Li,Fei Han,Guoping Zhang,Rong Sun,Ching-Ping Wong
High-purity, large-aspect-ratio, and well-dispersed copper nanowires (CuNWs) with an average diameter of 45 nm and length >100 μm were successfully synthesized by reducing a Cu(II) salt with glucose, with oleylamine (OM) and oleic acid (OA) serving as dual capping agents, through hydrothermal reduction. A systematic study of the effects of the copper salt, capping agents, reductant, and temperature on the morphology of CuNWs has been conducted. Our results indicate that CuNWs with different diameters can be obtained using different copper salts. The diameter of the as-prepared CuNWs decreases with increasing amounts of OM/OA and glucose but increases with the increasing temperature of the reaction. By adjusting the experimental parameters, we could achieve controlled synthesis of CuNWs and obtain high-quality CuNWs with different diameters of 45, 76, 85, 90, 100, 112, 135, and 175 nm.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2017
·
IF 2.552
Jiankun Huang,Huie Liu,Shuang Chen,Chuanqin Ding
Cork-like graphene aerogels were synthesized via EDA-ammonia double hydrothermal reduction approach. The synthesized porous aerogels displayed high porosity, hydrophobicity and excellent mechanical properties. Its adsorption efficiency for oil is significantly higher than that of conventional adsorbents, having oil capacity (130.10 g/g) for pure diesel and continuous treatment capacity (71.67 g/g) for emulsified oil in oil-contaminated water. Besides, its recycling performance was evaluated by mechanical extrusion, ethanol washing and calcined regeneration, and for emulsified oil, the adsorption process follows a pseudo-second-order kinetic model and adsorption isotherms are related well by the Freundlich model with a determination coefficient. ( R 2 ) of 0.9994. Furthermore, a continuous aerogel-based water treatment process has been proposed to make the graphene-based aerogels have great potential applications for oil spill clean-up and water purification.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Duchao Zhang,Hongbin Ling,Tianzu Yang,Weifeng Liu,Lin Chen
Electric arc furnace (EAF) dust is a hazardous waste material containing valuable elements, such as zinc (Zn) and iron (Fe), as well as other environmentally harmful elements. In the conventional process, the existence of zinc ferrite (ZnFe 2 O 4 ) in EAF dust results in a low recovery ratio of zinc and can induce high energy consumption or difficulties utilizing iron resources. In this article, a hydrothermal reduction method in a NaOH system is proposed to recover Zn selectively from EAF dust. First, when pure ZnFe 2 O 4 was used as the input material to test the feasibility of the new method, 70% Zn leaching efficiencies and the isolation of Fe in the residue through the formation of ferroferric oxide (Fe 3 O 4 ) were achieved at the optimal conditions of 260 °C, 6 M [NaOH], 10 g/L [C 6 H 12 O 6 ] n and 50 mL/g of L/S. Second, a leaching process of EAF dust was proposed using the following two procedures: (i) first leaching under normal pressure to dissolve zinc oxide (ZnO); and (ii) second leaching of the first leach residue under hydrothermal reduction conditions to dissolve ZnFe 2 O 4 . The leach liquor from the second step was recycled to the first step. Under optimum conditions, the leaching efficiencies of Zn during the first and second leaching were 66.4% and 69.3%, respectively. The total Zn leaching efficiency was calculated to be 89.7%, producing Zn-impregnated leach solution and a leach residue rich in Fe (up to 39.4 wt%) that are suitable as resources for a steel-making plant. However, this process also has its shortcomings owning to larger liquid-solid ratio in the leaching process. Overall, the study technically provides an alternative approach to improve the recycling of zinc and iron and effectively reduce environmental risks from EAF dust.
研究领域:
环境工程
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冶金工程
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资源循环利用
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清洁生产技术
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工业废物处理
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 15
·2643
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IF 5.719
Yanhui Zheng,Xifeng Hou,Siqi Lv,Zichuan Ma,Xiaolong Ma
In this study,β-cyclodextrin-modified reduced graphene oxide aerogels (β-CD-rGOAs) were synthesized via a one-step hydrothermal method and were used to remove hexamethyldisiloxane (L2) from biogas. Theβ-CD-rGOAs were characterized by the Brunner–Emmet–Teller technique, using Fourier-transform infrared spectroscopy, Raman spectrometry, scanning electron microscopy (SEM), contact angle measurements, and X-ray diffraction. The results of the characterizations indicate thatβ-CD was grafted onto the surface of rGOAs as a cross-linking modifier. Theβ-CD-rGOA had a three-dimensional, cross-linked porous structure. The maximum breakthrough adsorption capacity of L2 onβ-CD-rGOA at 273 K was 111.8 mg g−1. A low inlet concentration and bed temperature facilitated the adsorption of L2. Moreover, theβ-CD-rGOA was regenerated by annealing at 80 °C, which renders this a promising material for removing L2 from biogas.Keywords:reduced graphene oxide aerogel;β-cyclodextrin;hydrothermal reduction;hexamethyldisiloxane;contaminant removal
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2016
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IF 3.782
Nannan Qin,Ya Zhang,Hongjian Zhou,Zhigang Geng,Gang Liu,Yunxia Zhang,Huijun Zhao,Guozhong Wang
The reactivity of zero valent iron (Fe 0 ) for removing Cr(VI) is self-inhibiting under neutral and alkaline conditions, due to the precipitation of ferrous hydroxide on the surface of Fe 0 . To overcome this difficulty, we incorporated a second metal (Co) into Fe 0 to form FeCo bimetallic nanoparticles (FeCo BNPs), which can achieve higher activity and significant improvement in the reaction kinetics for the removal of Cr(VI) compared with Fe 0 . The FeCo BNPs were synthesized by a hydrothermal reduction method without using any templates. The characterization analysis indicated that the products were highly uniform in large scale with 120–140 nm size in diameter. The obtained FeCo BNPs exhibited a remarkable removal ability for Cr(VI) in the pH range of 5.3–10.0. Especially, FeCo BNPs were able to reduce trace Cr(VI) (1.0 mg L −1 , pH = 7.5) down to about 0.025 mg L −1 within 1 h. XPS analysis confirmed that Cr(VI) was reduced to Cr(III) by FeCo BNPs, while Fe and Co was oxidized, implying a chemical reduction process. The enhanced removal of trace Cr(VI) could be originated from the introduction of Co, which not only served as a protecting agent against surface corrosion by galvanic cell effect, but also enhanced the efficient flow of electron transfer between iron and Cr(VI). All the results primarily imply that FeCo BNPs can be employed as high efficient material for wastewater treatment.
研究领域:
环境科学
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纳米技术
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水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Xiaoting Deng,Shaofeng Yin,Zhiyong Xie,Feng Gao,Shu Jiang,Xi Zhou
A novel oxygen reduction reaction (ORR) electrocatalyst silver@platinum-cobalt-rGO nanoflower (Ag@PtCo-rGO NFs) is prepared by hydrothermal reduction method. The formation of silver chloride likes elm leaf microstructure in the reaction process, performing as a template. The Ag@PtCo-rGO NFs exhibit excellent electrocatalytic activity , whose specific activity is 9 times higher than that of commercial Pt/C. More importantly, Ag@PtCo-rGO NFs demonstrate excellent durability than JM Pt/C for ORR in acid media, as evidenced by accelerated durability test after 40,000 cycles. These excellent performances can be attributed to the special structure, atomic steps and synergistic effect between Pt, Ag and Co. The density functional theory calculation shows that Ag@PtCo has the best activity, which is related to the transition state for O–O bond. This work proposes a promising pathway for the synthesis of surfactant-free nanoflowers structure catalysts with high catalytic performance and low cost.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Yinglei Han,Tongqing Sun,Hongde Liu,Dahuai Zheng,Shiguo Liu,Yongfa Kong,Jingjun Xu
Due to the outstanding performance of iodate systems in the field of nonlinear optics, many iodate compounds have been synthesized. However, exploring novel iodate nonlinear optical (NLO) crystals remains challenging. Base on the mixed anionic groups strategy, we successfully synthesized Ln(H 2 O) 2 (IO 3 )(SeO 4 )·H 2 O (Ln = Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) crystals by the hydrothermal redox reaction. These compounds crystallize in the P 2 1 2 1 2 1 space group of orthorhombic system, and exhibit NLO response. However, their second-harmonic generation (SHG) efficiencies were much weaker than that of KDP due to the reverse arrangement of the anionic groups. Furthermore, the structural adjustment was conducted by the substitution of Ln³⁺ by Al³⁺, which resulted in the discovery of a new compound — [Al(OH) 2 ] 3 (IO 3 )(SeO 4 )·H 2 O. Despite the significant variation in the radii of the substituted cations, the aluminum iodate-selenate retains the structural framework of the original crystals. Moreover, it crystallizes in an NCS space group with higher symmetry — P 6 3 mc . The experiments showed that its SHG efficiency increased to 2 × KDP as a consequence of structural modification. Detailed structural analyses and theoretical calculations indicate that the orientational consistency of the [IO 3 ] − anion groups is the key factor contributing to the enhancement of the SHG response. This work offers new candidate materials and design strategies for the development of novel nonlinear optical materials with high-performance.
研究领域:
无机化学
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材料科学
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晶体工程
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非线性光学
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固体化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Xuesheng Liu,Xueli Li,Xuewei Liu,Sisi He,Junsu Jin,Hong Meng
To improve the photocatalytic performance of ZnO nanoparticles , based on the collective effect as electron sink of Ag and perfect two-dimensional (2-D) feature of graphene, Ag-ZnO-rGO nanoparticles were prepared by polyvinyl alcohol assisted freeze-drying and subsequent hydrothermal reduction method. Through photocatalytic degradation of methyl orange solution under UV irradiation , all as-prepared samples were assessed and compared with those of published works. The surface morphology , microstructure and optical property of materials were systematically studied by XRD , XPS , SEM , TEM and DRS , respectively. XPS and Raman spectra results confirmed that GO has successfully been reduced to rGO; SEM and TEM characterizations manifested that Ag-ZnO NPs were uniformly distributed in rGO with two-dimensional sheets structure; DRS characterization and Kubelka-Munk formula calculation illustrated that Ag-ZnO-rGO exhibited the smallest band gap and the best optical absorption performance. Moreover, the photocatalytic degradation results indicated that Ag-ZnO-rGO NPs combine the advantages of graphene and Ag which not only has significant adsorption but also maintains high photoreactivity.
研究领域:
材料科学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Shixin Zhang,Huanqiao Song,Tianjiao Li,Mingsheng Luo,Yu Chen,Changke Shao
Developing catalysts for the stable electrooxidation of ethanol have been a goal pursued by scientists. The present work reports a facile synthesis of catalysts with a double junction structure of Pt and SnO 2 on graphene (Pt/SnO 2 GN) through sol–gel combined with glycol hydrothermal reduction method. The physicochemical analyses show that the reduced Pt uniformly dispersed on GN is located adjacent to SnO 2 and has electronic interaction with the composite carrier. The electrochemical results exhibit that Pt/SnO 2 GN has better catalytic performance for ethanol electrooxidation than PtSnO 2 /GN and PtSn/GN. The ethanol oxidation peak current density on Pt/SnO 2 GN, after 1500 cycles of voltammetric testing, can still maintain 99.2% of the highest. The excellent catalytic stability of Pt/SnO 2 GN is ascribed to the double junction structure and the appropriate interaction between Pt and SnO 2 on GN, which enlarge the ECSA of Pt, improve the structural integrity, accelerate the charge transfer kinetics and increase the CO tolerance.
研究领域:
电化学
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催化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
IF 6.019
Bin Xu,Chenghua Chen,Jing Zhou,Zhongjin Ni,Xiaochun Ma
In this study, a novel microencapsulated phase change material paraffin@Cu-Cu 2 O/CNTs was successfully prepared by hydrothermal reduction and in situ deposition method , in which paraffin as the core, Cu, Cu 2 O and carbon nanotubes (CNTs) as the shell. SEM and TEM results proved that the microcapsules have a core-shell structure, the CNTs were irregularly wrapped on the shell, and the diameter of the microcapsules was about 600-800 nm. The melting temperature and latent heat of the paraffin@Cu-Cu 2 O/CNTs microcapsules were 61.17 °C and 81.31Jg -1 , respectively, and the encapsulation rate of the microcapsules was calculated to be 41.53% from the results of the DSC measurement. Due to the shell material, the paraffin@Cu-Cu 2 O/CNTs microcapsules displayed excellent thermal stability, its thermal decomposition temperature is increased by 97 °C compared to paraffin. Moreover, the paraffin@Cu-Cu 2 O/CNTs microcapsules were dispersed in water to form a new kind of slurry, such fluid exhibited great improvement in terms of thermal conductivity , specific heat capacity , light absorption performance and photo-thermal conversion efficiency than that of paraffin@Cu-Cu 2 O microcapsules slurry. Therefore, the high heat storage capability and excellent photo-thermal conversion performance of the paraffin@Cu-Cu 2 O/CNTs microcapsule slurry make it to be the most potential heat transfer fluid for direct absorption solar collector.
研究领域:
材料科学
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太阳能
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热能工程
✓ 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）