RSC Advances
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2020
·Vol. 10
·期 13
·7619-7627
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IF 3.119
Chunmei Xiao,Jianming Lin
The existence of Pb(II) ions in water systems poses significant potential hazards to public health and the environment. In the present study, poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) brush-modified Ni3Si2O5(OH)4 nanotubes were prepared, and their adsorption efficiency against the Pb(II) ions was investigated. The characterization results of FTIR spectroscopy, TGA, TEM, and XPS indicated the successful grafting of PAMPS on the surface of free Ni3Si2O5(OH)4 NTs, and the prepared PAMPS-g-Ni3Si2O5(OH)4 NTs exhibited a 6–8 nm grafting layer, which could provide abundant binding sites for metal adsorption. During the Pb(II) removal process, a pH-dependent adsorption behavior was observed, and the adsorption processes fitted well with the pseudo-second-order kinetic model and the Langmuir isotherm model. Compared with unmodified Ni3Si2O5(OH)4, the PAMPS-g-Ni3Si2O5(OH)4 NTs exhibited obviously faster adsorption of Pb(II) and higher equilibrium adsorption capacity for the removal of Pb(II). The maximum adsorption capacity calculated via the Langmuir isotherm model was 0.653 mmol g−1 (135.3 mg g−1) at 298 K. In a metal coexisting system, the total adsorption capacity of the NTs was increased; this indicated the potential of the proposed NTs in the removal of Pb(II) from metal coexisting wastewater. This study showed the significant potential of PAMPS-g-Ni3Si2O5(OH)4 NTs in the effective removal of Pb(II).
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
PubMed
高影响因子
Particuology
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2023
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IF 3.5
Zixu Shi,Chaoyun Shi,Huili Shi,Binfang He,Guoqiang Qin,Ao Li,Jing Zhu,Jingbo Chen
Silica-based anode material is the most concerned material at present, which has the advantages of good cycle stability, high theoretical specific capacity and abundant reserves. However, silica suffers from inherent low conductivity , severe volume expansion effect and low initial coulombic efficiency, which limits its application in lithium-ion batteries. Nanotubes structure can mitigate the volume expansion during lithiation/delithiation. In this article, silica nanotubes (SNTs) were prepared using carbon nanotubes (CNTs) as a template, and then the uniform carbon layer was coated on their surface by carbonization of citric acid . The hollow structure of nanotubes provides more sites for the insertion of Li + during lithiation and additional channels for Li + migration in the cycles, which improves the electrochemical performance. Conductivity can be enhanced by coating carbon layer. The specific capacity of the composite material is about 650 mAh g −1 at 0.1 A g −1 after 100 cycles. With a specific capacity of 400 mAh g −1 even at 1 A g −1 after 100 cycles. The silica-based material is a competitive anode material for lithium-ion batteries.
研究领域:
材料科学
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电化学
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纳米技术
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DOI
高影响因子
Nanomaterials
·
2017
·Vol. 7
·期 8
·196
·
IF 3.553
Bin Liu,Xiaomeng Wu,Shan Wang,Zhen Tang,Quanling Yang,Guo-Hua Hu,Chuanxi Xiong
Lithium-sulfur (Li-S) batteries have become promising candidates for electrical energy storage systems due to their high theoretical specific energy density, low cost and environmental friendliness. However, there are some technical obstacles of lithium-sulfur batteries to be addressed, such as the shuttle effect of polysulfides. Here, we introduced organically modified carbon nanotubes (CNTs) as a coating layer for the separator to optimize structure and enhance the performance of the Li-S battery. The results showed that the cell with a CNTs-coated separator exhibited an excellent cycling performance. Compared to the blank separator, the initial discharge capacity and the capacity after 100 cycles for the CNTs-coated separator was increased by 115% and 161%, respectively. Besides, according to the rate capability test cycling from 0.1C to 2C, the battery with a CNTs-coated separator still released a capacity amounting to 90.2% of the initial capacity, when the current density returned back to 0.1C. It is believed that the organically modified CNTs coating effectively suppresses the shuttle effect during the cycling. The employment of a CNTs-coated separator provides a promising approach for high-performance lithium-sulfur batteries.Keywords:Lithium-sulfur batteries;carbon nanotubes;separators;shuttle effect
研究领域:
材料科学
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能源存储
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2014
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IF 2.726
Pin Lv,Wuyou Fu,Yannan Mu,Hairui Sun,Shi Su,Yanli Chen,Huizhen Yao,Dong Ding,Tie Liu,Jun Wang,Haibin Yang
TiO 2 film materials have very wide applications in photovoltaic conversion techniques. And, TiO 2 nanotubes array film with nanowires directly formed on top (denoted as TiO 2 NTWs) was prepared by the anodization method. CdS and PbS quantum dots (QDs) were firstly cosensitized on the TiO 2 NTWs array (denoted as (CdS + PbS)/TiO 2 NTWs) by novel successive ionic layer adsorption and reaction (N-SILAR), which only needed a cation mixed solution containing Cd 2+ and Pb 2+ and an anionic solution containing S 2− . This N-SILAR method can not only effectively shorten the experimental time, simplify the experiment procedure and reduce the experiment cost, but also make the material of (CdS + PbS)/TiO 2 NTWs possess the advantages of improving electron transport and reducing chemical erosion. Moreover, the photocurrent of (CdS + PbS)/TiO 2 NTWs was 4.1 mA/cm 2 under an illumination of 100 mW/cm 2 . The most eye-popping part was that the result was 8 times higher than that of the bare TiO 2 NTWs array. The result of photoelectrochemical measurements indicated that this novel material had a potential application in photovoltaic devices.
研究领域:
材料科学
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光电子学
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
Siyue Zhang,Lin Zhu,Zheng Ai,Baoli Wang,Ahmad Mansoor,Yan Zhang,Wei Sun
By using carbon nanotube (CNT) as the carrier, Ni as the active center and ZrO 2 as the modifier, an efficient electrocatalytic material (ZrO 2 -Ni/CNT) is designed and synthesized in this paper. The structure and properties of the catalyst are characterized by various instrumental analysis methods such as SEM, TEM, XRD and XPS. The electrochemical test results show that the addition of ZrO 2 can significantly improve the catalytic performance of this catalyst in the electrochemical water splitting. In an alkaline solution, ZrO 2 -Ni/CNT catalyst displays an exceedingly low overpotential of 169 mV and 249 mV at the current density of 10 mA cm −2 towards hydrogen evolution reaction and oxygen evolution reaction, respectively. This work shows that the modification of ZrO 2 can improve the electrocatalytic activity of Ni-based materials, and the modification strategy can be applied to improve the electrocatalytic activity of commercial Ni-based electrode materials.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2022
·
IF 3.754
Jian Lu,Hui Lin,Ruijin Hong,Dawei Zhang
By the solid phase reaction method, pure KNN and KNN with different proportions halloysite nanotubes (HNTs) were prepared to study the photocatalytic hydrogen evolution performance under the UV light irradiation. The band gaps of KNN with HNTs are narrower than that of pure KNN. The absorbance of KNN in the ultraviolet region is significantly enhanced by the incorporation of HNTs, where the absorbance in the 200-300 nm region increased about 2 times. Compared with KNN, the conduction band edge of KNN-5wt%HNTs reduced from −1.13 eV to −1.18 eV, showing stronger reducing ability. The H 2 production rate of KNN with HNTs is much higher than that of the raw KNN without HNTs. The best H 2 production rate of KNN-5wt%HNTs is 31.28 μmol•g −1 •h −1 , approximate 4.48 times as high as the rate of pure KNN (6.98 μmol•g −1 •h −1 ), suggesting appropriate addition of HNTs can efficiently improve the H 2 production efficiency.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yu Tan,Yike Wei,Gaigai Liu,Yuhang Cai,Siyu Liu,Shijie Wang,Shenghan Zhang,Kexin Liang
The mild reaction conditions, simple process, and clean raw materials make electrochemical nitrogen reduction reaction to ammonia (NRR) a promising method for producing this crucial substance for human life. The proposed catalysts have been shown to reduce the reaction barrier and improve catalytic efficiency, making them an excellent choice for this process. Carbon nanotubes coated FeMoO 4 (FeMoO 4 @CNTs) nanorods are a highly efficient catalyst for fixing N 2 to NH 3 . Carbon nanotubes doped FeMoO 4 improve the efficiency of electrocatalytic NRR by increasing their active surface. A superior ammonia yield of 18.49 μg h −1 ·mg·cat −1 at −0.65 V was obtained in a 0.1 mol L −1 Na 2 SO 4 solution, with a corresponding Faraday efficiency of 16.14%. The response of the experimental system to environmental factors was also investigated. The data clearly indicates that raising the temperature does not enhance the yield of ammonia. This reaction system is optimal for neutral or alkaline environments.
研究领域:
化学
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材料科学
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环境科学
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DOI
高影响因子
FUEL
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2019
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IF 5.128
Limo He,Guang Liao,Song Hu,Long Jiang,Hengda Han,Hanjian Li,Qiangqiang Ren,Mohamed E. Mostafa,Xun Hu,Yi Wang,Sheng Su,Jun Xiang
The effects of reaction temperature (range from 500 °C to 800 °C) on multiple competitive processes were studied for the co-production of hydrogen and carbon nanotubes (CNTs) during catalytic reforming of toluene over Ni/α-Al 2 O 3 . With the temperature raising from 500 to 800 °C, H 2 yield increased by 7 times while H 2 proportion slightly decreased 5 vol% due to the competitive effect between steam reforming and reverse water–gas shift (WGS) reaction. Coke amounts (including amorphous carbon and CNTs) firstly increased and then decreased, which was determined by the competitive rate of formation and consumption reaction. Detailed characterization indicated the yield and quality of CNTs improved with the temperature increasing from 500 to 650 °C and reached the maximum at 650 °C, resulting from the enhancing transformation from amorphous to CNTs and consumption of amorphous carbon by steam. However, the growth of CNTs was suppressed by further increasing temperature, and almost no CNTs were generated at 800 °C. The higher temperature aggravated the sintering of Ni and enlarged their particle size, which was not conduced to CNTs growth.
研究领域:
化学工程
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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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2023
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IF 8.6
Wenlan Ji,Weiwei Li,Tian C. Zhang,Yuan Wang,Shaojun Yuan
Arsenic-containing water needs to be purified to reduce the global hazards of arsenic to human health and ecosystems. Herein, successive electrodeposition of SnO 2 and RuO 2 nanoparticles on the TiO 2 nanotube arrays (TNTAs) was performed to synthesize dimensionally stable TNTAs/SnO 2 /RuO 2 anodes for highly efficient electrocatalytic oxidation of As(III) in aqueous solution. Such a TNTAs/SnO 2 /RuO 2 anode possessed fast charge transfer, higher oxygen evolution potential (OEP), larger electrocatalytic active area, and excellent stability, and delivered effectively electrocatalytic oxidation As(III), of which 10 mg/L of As(III) was completely oxidized into As(Ⅴ) with lower toxicity within 20 min owing to the synergistic effect of RuO 2 and SnO 2 . Impressively, the optimized TNTAs/SnO 2 /RuO 2 -10 anode presented an excellent electrochemical stability and longer service lifetime, and its oxidation conversion efficiency of As(III) still could be maintained to be 98% as well as its kinetic reaction constant decreased by only 0.03 even after 11 recycled usage, which was ascribed to the intensified interaction between RuO 2 and TNTAs/SnO 2 . The excellence of the innovative anode was also evidenced through its strong anti-interference ability to coexisting ions and the elucidation of the associated oxidation reaction mechanism of As(III) on the surface of the anode by electron spin resonance and radical scavenger tests. This novel electrode integrates high electrocatalytic activity, high electron transport and high stability, ensures the long-term stable use of the electrode, while realizes efficient and rapid electrocatalytic oxidation of As(III) in aquatic environments. This work provides new ideas for further improving the catalytic performance and stability of dimensionally-stable anode materials.
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
Journal of the Taiwan Institute of Chemical Engineers
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2023
·
IF 5.7
Chengzhi Hu,Huiping Zhang,Ying Yan
Background Co 3 O 4 shows potential as a cost-effective alternative to precious metal catalysts for VOCs catalytic combustion. However, its catalytic activity requires further enhancement. Methods A new type of paper-like carbon nanotube membrane composite (CNTs/PSSF) was used as a support to prepare Co 3 O 4 -CNTs/PSSF catalysts by metal-organic vapor deposition (MOCVD) and impregnation method (IM) respectively for toluene combustion. Besides, the effects of acid treatment to support on the catalytic activity were investigated. Various characterization techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), and oxygen temperature-programmed desorption (O 2 -TPD), were employed to evaluate the effects of different preparation methods and acid treatment on the structure and catalytic performance mechanism of Co 3 O 4 -CNTs/PSSF. Significant findings The preparation method significantly affects the catalyst's properties and catalytic activity. Compared with IM, the MOCVD-prepared catalysts show stronger coordination of carbon nanotubes, resulting in more oxygen vacancies and surface active oxygen. Additionally, oxygenous groups introduced by HNO 3 form Co-O-C linkage between Co and CNTs, promoting oxygen vacancies and enhancing surface active oxygen content, thereby dramatically improving the catalyst's catalytic activity, especially for HIM-10 whose T 90 is reduced by 140 °C. This work provides insights for enhancing the catalytic combustion activity of cobalt oxide.
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
SCIENCE OF THE TOTAL ENVIRONMENT
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2023
·
IF 9.8
Feilong Dong,Chuyun Fu,Zhu Meng,Qiufeng Lin,Jinzhe Li,Tao Zeng,Da Wang,Juntao Tang,Shuang Song
Ferrate (Fe(VI)) has been extensively studied as a green oxidant to treat wastewater. But Fe(VI) oxidation still faces several challenges for application, such as the sensitivity of Fe(VI) to pH and the restrictions on the Fe(VI) utilization efficiency for pollutant elimination at low concentration levels. This study proposed a two-stage Fe(VI) oxidation process to enhance the bisphenol A (BPA) removal for potential applicability, consisting of the adsorption by CNTs of stage I and the degradation by Fe(VI) of stage II. The Fe(VI) utilization efficiency in the two-stage process (0.848) was higher than that in one-stage processes (0.727) and Fe(VI) alone system (0.504) at pH 9. In stage I, the adsorption process had good compliance with the Langmuir isotherm model and pseudo-second-order kinetic model. In stage II, the effective utilization of low-concentration Fe(VI) was 2.45 times more than Fe(VI) alone, and the reduction of reaction volume was beneficial to further enhance utilization. The probe experiments (sulfoxide) and the degradation experiments of other electron-donating/withdrawing pollutants (e.g., atrazine, benzoic acid) demonstrated that Fe(IV) and Fe(V) were major oxidizing species in the two-stage process. The regeneration experiments showed that CNTs still had acceptable adsorption and catalytic capabilities after five cycles. Finally, the intermediate products in the two-stage process were detected and four possible degradation pathways of BPA were proposed. These findings were meaningful for the practical application of Fe(VI) oxidation to overcome the conditional limitation and improve the utilization.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2020
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IF 4.605
Hongyuan Zhao,Huina Ma,Xiaoguang Li,Binbin Liu,Runqiang Liu,Sridhar Komarneni
We report a simple and highly efficient preparation of nanocomposite of halloysite (Hal) nanotubes/multi-walled carbon nanotubes (Hal-MWCNTs) and its electrochemical sensor application for the determination of methyl parathion (MP). The phase structure and surface morphology of the Hal-MWCNTs nanocomposite were confirmed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectra. According to the electrochemical tests, the fabricated glassy carbon electrode (GCE) sensor with Hal and multi-walled carbon nanotubes showed excellent MP determination performance because of the synergistic effect of Hal and multi-walled carbon nanotubes . The Hal-MWCNTs/GCE sensor exhibited a relatively low detection limit of 0.034 μM in the linear range of 0.5–11 μM. When used for the determination of MP in real samples, the Hal-MWCNTs/GCE sensor showed good detection effect with satisfactory relative standard deviation (RSD) of 2.46 to 3.08% and recoveries of 98.8 of 101.8%. This work indicated that the nanocomposite of Hal-MWCNTs when coated on GCE is useful for the fabrication of high-performance MP electrochemical sensor.
研究领域:
分析化学
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环境监测
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纳米材料科学
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电化学
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食品安全
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毒理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）