Journal of the Taiwan Institute of Chemical Engineers
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2016
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IF 2.848
Ruiqi Fu,Yu Liu,Zimo Lou,Zhuoxing Wang,Shams Ali Baig,Xinhua Xu
A novel adsorbent (AC/Fe 3 O 4 @SiO 2 –NH 2 ) was synthesized via a co-condensation process for the enhanced removal of Pb(II) from aqueous solutions. Characterization analyses including SEM, TEM, BET and XRD confirmed the successful integration of magnetic nanoparticles and amino groups with carbon matrix. Results demonstrated that AC/Fe 3 O 4 @SiO 2 –NH 2 (mass ratio of AC to Fe 3 O 4 was 1:0.25) with specific surface area (48.9 m 2 /g) showed higher adsorption capacity for Pb(II) as compared to other mass ratios. Kinetics study revealed that the adsorption reach equilibrium within 20 h and the maximum adsorption capacity of 104.2 mg/g was achieved with increasing the initial concentration from 20 to 250 mg/L using AC/Fe 3 O 4 @SiO 2 –NH 2 . Maximum removal efficiency was recorded at pH 5.2 and the removal capacities toward four divalent metal ions calculated by the Langmuir model were found to be in the order of Pb(II) > Cu(II) > Ni(II) > Cd(II). Furthermore, Δ G 0 decreased from –1.6 to −3.1 kJ/mol with increase in temperature from 293 to 333 K illustrating that the adsorption was spontaneous and an endothermic process. Complexation adsorption mechanism was found prominent in FTIR and XPS analyses between Pb(II) and AC/Fe 3 O 4 @SiO 2 –NH 2 due to the presence of amino groups.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Qingling Zhao,Xiang Li,Xiaotong Wang,Zehao Zang,Heyan Liu,Lanlan Li,Xiaofei Yu,Xiaojing Yang,Zunming Lu,Xinghua Zhang
The surface functional groups of carbon dots (CDs) play a significant role in the luminescence performances, but it is still unclear about the effects of special groups on the luminescence mechanism since there are different groups on the surface of prepared CDs. Here, electrochemical method was adopted to synthesize initial CDs and graphite rods served as raw materials, and initial CDs were only modified with amino groups to regulate their surface states, which lead to the blue, green and red luminescence for the modified CDs. The amino groups with different contents are only introduced on the surface of CDs without affecting carbon core. With the increased contents of amino groups, the luminescence spectra of CDs can be successfully modulated from blue to red emission. In addition, the blue emitting carbon dots (B-CDs) have a specific response to Cu 2+ ions and can be applied as a fluorescent probe to detect Cu 2+ ions in the solution. Moreover, the addition of DL-serine can restore the blue emission of B-CDs quenched by Cu 2+ ions. Therefore, the B-CDs have great potential application as a fluorescent reversible ion detector.
研究领域:
材料科学
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分析化学
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纳米技术
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Mengqin Zhou,Zhenlong Liu,Tongliao Liu,Yan Zhu,Ning Lin
As a renewable and highly crystalline nano-object, chitin nanocrystals (ChNC) are the mechanical building blocks in the cell walls of fungi and the exoskeletons of shellfish, insects, and other crustaceans and have attracted intense interest in the production of functional materials. The structural feature of ChNC is composed of acetylglucosamine units with two hydroxyl groups and one acetyl group, and the latter can be transformed into more active amino groups by deacetylation. One issue is that obtaining more accessible amino groups by increasing the degree of deacetylation of ChNC under the preservation of the original crystalline property and rodlike morphology determines its subsequent modification and potential application. We analyze the influence of acid hydrolysis on the formed amino groups in the preparation process of ChNC and further investigate the tradeoff between gradiented deacetylation and varied crystalline index of this natural nanocrystal. The deacetylated ChNC obtained surface amino groups and retained its crystallinity, followed by surface fluorescence modification in an electrophilic addition reaction based on electrophilic addition reaction between the amino groups on its surface and the thiocyano groups of a fluorescent molecule. Finally, the fluorescent-modified ChNC is introduced into a water-borne polyurethane-based nail polish coating, providing a bright fluorescence performance, superior mechanical enhancement, and a rigid nanocomponent as a multifunctional additive.
研究领域:
材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
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2023
·Vol. 8
·期 9
·e202204060
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IF 2.1
Guang Shuo Zhu,Jia Yu Zheng,Chang Bao Han,Hao Zhang,Peiyu Chang,Wen Kang Zhao,Junda He,Yi Xia,Xuemei Song,Hui Yan
Graphical An amino groups modified MnO x catalyst (DEA-MnO x -PUF) was prepared for HCHO removal. During the indoor environment, the catalyst shows higher HCHO removal efficiency (93.9 %) than that of unmodified MnO x -PUF catalyst (88.6 %). It is attributed to the continuous decomposition of intermediates during the catalytic process by amino groups cross-linked on the surface of the catalyst. Indoor formaldehyde (HCHO) pollution has more and more serious adverse effects on human health, it is urgent to develop a material that can be embedded in the air purifier to achieve HCHO's degradation efficiently. In this work, based on the carrier material of polyurethane foam (PUF) modified by amino groups diethanolamine (DEA), we propose a strategy to prepare a manganese oxide compound catalyst (DEA-MnO x -PUF). During the static testing (C HCHO : 11.591 ppm, T: 25 °C), the catalyst shows higher HCHO removal efficiency (93.9 %) than that of unmodified MnO x -PUF catalyst (88.6 %), and it achieves high HCHO-to-CO 2 conversion (68.5 %). Additionally, during the continuous single-pass catalysis testing (C HCHO : 11.591 ppm, T: 25 °C, 240000 mL/(g cat h)), HCHO removal efficiency can be maintained around at 95 % within 50 hours. The excellent performance is attributed to the continuous decomposition of intermediates during the catalytic process by amino groups cross-linked on the surface of the catalyst. Based on the block whole MnO x -based catalyst DEA-MnO x -PUF, this work will provide a new route to develop a powerful purifier material with long-term efficient removal of HCHO.
研究领域:
环境科学
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材料科学
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室内空气治理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）