JOURNAL OF HAZARDOUS MATERIALS
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2015
·
IF 4.529
Zailin Gong,Shujin Li,Jun Ma,Xiangdong Zhang
The commercial powdered activated carbon (PAC) has been selectively oxidized by two methods. The two oxidized methods are wet oxidation with ammonium persulfate and thermal treatment after acidification with hydrochloride acid, respectively. The two oxidized PAC were then functionalized with thermoresponsive poly ( N -isopropylacrylamide) (PNIPAM) in aqueous solution at ambient temperature. Comparing the two oxidized PAC products and their grafted derivatives, the oxidized PAC modified with thermal treatment after acidification shows larger surface area of 1184 m 2 /g and better adsorption of bisphenol A. Its derivative also exhibits relatively large surface area and adsorption capacity after grafted with PNIPAM. The maximum surface adsorption capacity simulated under Langmuir Models reached 156 mg/g. In addition, the grafted PAC products show self-flocculation behaviors with rapid response to temperature because of the thermal phase transition and entanglement behaviors of PNIPAM. The present study provides a new way to obtain carboxyl-rich activated carbon with large surface area and better adsorption capacity. The retrievable grafted PAC with good self-flocculation effect responsive to temperature will have high potential application in water remediation which requires pre-heating and emergency water treatment in the wild.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Yaoxun Zhang,Jian Zou,Shengji Wang,Xiangshu Hu,Zihao Liu,Peiyong Feng,Xin Jing,Yuejun Liu
MXenes are ideal conductive fillers to construct conductive routes for hydrogel-based flexible sensors owing to their great metallic conductivity, hydrophilicity , and high specific surface area. However, their high tendency to aggregate in sol solution severely limited the performance of the resultant hydrogels. Therefore, to enhance the performance of MXene-filled composite hydrogels , we proposed an oxidization method to tailor the nanostructure of MXene to improve the conductivity, transparency, mechanical properties, and sensitivity of the composite hydrogels. Meanwhile, it is noted that the conductivity of the hydrogel significantly affected the output performance of hydrogel-based triboelectric nanogenerator (H-TENG). The polyacrylamide/oxidized MXene (POM) hydrogel-based TENG with the highest output performance was assembled for self-powered sensing and energy harvesting , which demonstrated great reliability and durability with a maximum open circuit voltage of 243 V and a peak power density of 2.38 W/m 2 . Moreover, the relationship model between the conductivity of the hydrogel and the output performance of the H-TENG was successfully proposed based on the performance of the developed H-TENGs. Therefore, this work shed lights for reasonable design of H-TENGs with high output performance.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2015
·Vol. 27
·期 3
·3021-3025
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IF 1.569
Zhang Xiwei,Tang Zhenjie,Hu Dan,Wang Zhi,Yu Fengjun,Cui Haitao,Xu Tongshuai,Ju Lin
A facile method was used to oxidize p-type Zinc Selenide (ZnSe) nanowires into n-type Zinc Oxide (ZnO) through a 700 °C annealing process in air. Single crystal ZnSe nanowires, with a hole concentration of 0.805 × 10 18 cm −3 and
a negative photoconductivity, were oxidized into polycrystalline ZnO nanowires with an electron concentration of 4.88 × 10 18 cm −3 and a positive photoconductivity. Additionally, both the as-synthesized ZnSe nanowires and the post-oxidized ZnO nanowires presented excellent optoelectronic properties. This method can be used to construct radial p–n junctions or other nano-devices based on a single NW through a regioselective oxidation process.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Shencheng Pan,Bing Li,Juan Yu,Lulu Zhao,Yongxing Zhang
Oxygen evolution reaction (OER) is an important half-cell reaction of water splitting. The OER involves a multiple proton-coupled electron transfer process, which leads to the sluggish kinetic reaction. Searching for highly efficient route to synthesize electrocatalysts for OER is significant for developing sustainable energy systems. Herein, the 2D ultrathin cobalt-manganese layered double hydroxides (CoMn-LDHs) nanosheets with a typical hydrotalcite structure are prepared by a specific reduction–oxidation method. Particularly, the Co 8 Mn 2 -LDH electrocatalyst exhibits the highest activity along with a large surface area of 276.9 m 2 /g among different Co/Mn ratios of the CoMn-LDHs. The as-prepared Co 8 Mn 2 -LDH shows an overpotential as low as 307 mV at the 10 mA/cm 2 current density and a small Tafel slope of 86 mV/dec. The Co 8 Mn 2 -LDH still maintains a satisfactory durability after a long-term continuous measurement. Such excellent electrocatalytic performance may be attributed to the huge surface area and the unique layered structure, which will do favor to the charge transport between the interface of solution and catalyst. Therefore, the reduction–oxidation method provides a highly efficient route to synthesize LDHs for OER.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Rui Chen,Gao Li,Jiqiang Hu,Jialin Zhang,Hanqi Zhang,Zhengong Zhou,Bing Wang
Polydopamine (PDA), recognized for its exceptional adhesion and high-temperature resistance, serves as an effective sizing agent in demanding composite material production. This study explores the application of PDA as an interface adhesive for carbon fiber-reinforced high-temperature phthalonitrile (PN) composites (CFRPN), assessing the effects of two PDA synthesis methods—electrochemical and solution oxidation—on interfacial modification. The electrochemical method uniformly fills grooves on CF surfaces, creating an optimal interface layer , yet it encounters challenges in bulk, multi-layer fiber processing . Conversely, the solution oxidation method, despite less uniform PDA distribution, exhibits greater consistency in batch processing and significantly enhances the interlaminar shear strength of CFRPN, outperforming the electrochemical method in mechanical enhancements. Given its simplicity and reduced equipment requirements, the solution oxidation method offers considerable potential for broader engineering applications .
研究领域:
材料科学
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复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Ruohao Dong,Haoran Du,Yixuan Sun,Kuangfu Huang,Wen Li,Baoyou Geng
The design and synthesis of high-performance catalysts for oxygen evolution reaction (OER) are crucial for electrocatalysis reaction. In this study, the new Ag-decorated Co-based hydroxides nanosheets with good performance as well as gram-scale yield are prepared by a selective reduction–oxidation method in virtue of the different stability of metal in air. The doping of silver obviously raises the electrical conductivity of the catalysts. Due to the synergistic reaction of the high electrical conductivity and the original active sites, the overpotential of the as-prepared Ag-decorated Co(OH)2 nanosheets is as low as 270 mV at 10 mA/cm2. Compared to the pure Co(OH)2 nansheets, the overpotential decreased about 80 mV at the same current density. Especially, different from the general preparation methods, this process can be carried out at room temperature and does not need any strict condition. And the gram-scale output gives this method potential for industrial production.
研究领域:
电化学
·
催化
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材料科学
✓ 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）