COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Jinming Ma,Huizhen Deng,Zhe Zhang,Lexin Zhang,Zhihui Qin,Yaru Zhang,Lili Gao,Tifeng Jiao
In this study, a series of Ag 3 PO 4 /PPy/PANI ternary composite catalysts were fabricated by adjusting the mixed solution of pyrrole and aniline with different volume ratios of 4:1, 3:2, 1:1, 2:3, and 1:4, and combining with the in-situ synthesis method. The synthesized Ag 3 PO 4 /PPy/PANI nanoparticles were examined by XRD , SEM, TEM and EDX , Raman spectroscopy . When the ratio of pyrrole and aniline is 1:1, the polymerized PPy/PANI acted as the supporting matrix to effectively immobilize and prevent the aggregation of Ag 3 PO 4 nanoparticles. The catalytic performances of the Ag 3 PO 4 /PPy/PANI composites were confirmed for reduction of 2-nitroaniline (2-NA) and 4-nitrophenol (4-NP) in the presence of NaBH 4 at room temperature by UV–vis spectroscopy. Results showed that the catalytic reduction effect of the Ag 3 PO 4 /PPy/PANI (1:1) on 2-NA is obviously better than that on 4-NP, which followed the pseudo-first-order kinetic, and the corresponding rate constants are 0.0053 min −1 and 0.022 min −1 , respectively, indicating that it has potential application in wastewater treatment in industries.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Shixue He,Chao Yang,Mingguang Niu,Dandi Wei,Shasha Chu,Mei Zhong,Jide Wang,Xintai Su,Lu Wang
Well-defined deposition of noble metal nanoparticles is attractive for the synthesis of heterogeneous metal catalysts with excellent activity, stability, and easy separability. Herein, a facile method combining surface coordination deposition with thermal decomposition has been proposed to fabricate Ag/CoFe 2 O 4 composites as magnetic catalysts for hydrogenation reduction of 4-nitrophenol and 2-nitroaniline. This method involved the adsorption of silver ions on cobalt-ferrous oxalate through the surface coordination, and then the thermal decomposition into Ag/CoFe 2 O 4 . The characterizations of XRD , SEM, FTIR, BET, VSM , XPS and Element mapping were utilized to reveal that Ag/CoFe 2 O 4 exhibited a magnetic saturation of 40.4 emu g −1 , a specific surface area of 58.8 m 2 g -1 , and an even distribution of metallic Ag on CoFe 2 O 4 particles. Catalytic reduction tests of 4-nitrophenol and 2-nitroaniline indicated that the Ag contents in Ag/CoFe 2 O 4 seriously affected the catalytic activity of the catalysts. Moreover, the durability test showed that Ag/CoFe 2 O 4 still preserved ∼74.6% of the initial catalytic activity even at the 20th run.
研究领域:
化学
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材料科学
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催化反应
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 53
·47966-47973
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IF 3.289
Yao Shi,Xiaoliang Zhang,Yongmei Zhu,Hongliang Tan,Xiangshu Chen,Zhang-Hui Lu
Ag–CeO2 nanocomposites (Ag@CeO2 NCs) with a core–shell structure have been successfully synthesized through the combination of a redox reaction and the reverse micelle technique without any additional reductants or surfactants. Under a N2 atmosphere, the redox reaction automatically occurs between Ag+ and Ce3+ in an alkaline solution, resulting in the formation of Ag@CeO2 NCs by the self-assembly process. By using the XRD, FE-SEM, TEM, XPS, and ICP methods, the characterized results of Ag@CeO2 NCs show that Ag nanoparticles (NPs) with a diameter of 3–7 nm are surrounded by CeO2 NPs. Compared to CeO2 supported Ag NPs, free Ag NPs, and CeO2, the as-synthesized Ag@CeO2 NCs exhibit a superior catalytic activity and high sustainability for the hydrogenation of 4-nitrophenol (C6H5NO3, 4-NP) and 2-nitroaniline (C6H6N2O2, 2-NA) with sodium borohydride (NaBH4) in water solution at room temperature. The Ag@CeO2 NCs can achieve a complete reduction of 4-NP and 2-NA with turnover frequencies (TOF) of 138.7 and 109.8 h−1, respectively. The durability tests show that the Ag@CeO2 NCs are still highly active for the reduction of 4-NP and 2-NA, preserving 98% and 95% of their initial catalytic activity even after ten runs.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
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2019
·Vol. 24
·期 20
·3718
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IF 3.06
Mao-Long Chen,Shu-Yang Zhou,Zhou Xu,Li Ding,Yun-Hui Cheng
MIL-100(Fe, Cr) and MIL-101(Cr) were synthesized by the hydrothermal method and applied to the adsorptions of five aromatic amines from aqueous solutions. These three metal-organic frameworks (MOFs) were well characterized by powder X-ray diffraction (PXRD), scanning electron microscope (SEM), transmission electron microscope (TEM), thermogravimetric analysis (TGA) and surface area analysis. The adsorption mechanism of three MOFs and the effects of the structures of MOFs on the adsorption of aromatic amines were discussed. The results show that the cavity system and suitable hydrogen bond acceptor were important factors for the adsorption for five aromatic amines of aniline, 1-naphthalamine, o-toluidine, 2-amino-4-nitrotoluene and 2-nitroaniline: (a) the saturated adsorption capacity of aniline, 1-naphthylamine and o-toluidine on MIL-100(Fe) were 52.0, 53.4 and 49.6 mg/g, respectively, which can be attributed to the intermolecular hydrogen bond interaction and cavity system diffusion. (b) The adsorption capacity of 2-nitroaniline and 2-amino-4-nitrotoluene on MIL-101(Cr) were 54.3 and 25.0 mg/g, respectively, which can be attributed to the more suitable pore size of MIL-101(Cr) than that of MIL-100(Fe, Cr). The MOFs of MIL-100(Fe) and MIL-101(Cr) can be potential materials for removing aromatic amines from aqueous solutions.Keywords:metal-organic framework;adsorption;aromatic amines;aniline;1-naphthalamine;o-toluidine;2-amino-4-nitrotoluene;2-nitroaniline
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xinyu Chen,Yingrui Nie,Wenqian Fan,Zhimin Zhao,Zhifei Wang,Yong Jiang
In this study, yolk-shell magnetic hydrogel microspheres loaded with silver nanoparticles (Fe 3 O 4 @P(DVB-co-MAA)@Ag) were innovatively constructed for efficient catalytic reduction of nitroaromatic compounds. First, hollow P(DVB-co-MAA) microspheres were prepared as shell. Fe 3 O 4 magnetic nanoparticles were successfully deposited into the microspheres as yolk through the decomposition of metal-organic precursor salts in high-temperature organic solvents. The EM images shows that Fe 3 O 4 @P(DVB-co-MAA) microspheres consist of a magnetic core, an intermediate void layer, and a hydrophilic hydrogel shell, demonstrating a unique multilayered structural feature. Then, highly active silver nanoparticles were uniformly loaded onto the hydrogel shell surface using the thermal co-reduction method. Catalytic results demonstrated that the yolk-shell material showed significantly enhanced activity toward the reduction of 4-nitrophenol (4-NP) and 2-nitroaniline (2-NA), compared to the core-shell structured composite microspheres. The catalytic parameters were 65.44 s⁻¹ g⁻¹ and 46.44 s⁻¹ g⁻¹ , respectively. Remarkably, the composite retained over 85 % catalytic efficiency after five cycles of use and achieved rapid magnetic separation within 20 s under an external magnetic field.
研究领域:
材料科学
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化学工程
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纳米技术
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催化
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环境科学
✓ 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）