Nanomaterials
·
2018
·Vol. 8
·期 3
·141
·
IF 3.504
Guangyin Fan,Xiaojing Li,Caili Xu,Weidong Jiang,Yun Zhang,Daojiang Gao,Jian Bi,Yi Wang
Developing highly efficient and recyclable catalysts for the transformation of toxic organic contaminates still remains a challenge. Herein, Titanium Carbide (Ti3C2) MXene modified by alkali treatment process was selected as a support (designated as alk-Ti3C2X2, where X represents the surface terminations) for the synthesis of Pd/alk-Ti3C2X2. Results show that the alkali treatment leads to the increase of surface area and surface oxygen-containing groups of Ti3C2X2, thereby facilitating the dispersion and stabilization of Pd species on the surface of alk-Ti3C2X2. The Pd/alk-Ti3C2X2catalyst shows excellent catalytic activity for the hydrodechlorination of 4-chlorophenol and the hydrogenation of 4-nitrophenol in aqueous solution at 25 °C and hydrogen balloon pressure. High initial reaction rates of 216.6 and 126.3 min−1·gpd−1are observed for the hydrodechlorination of 4-chlorophenol and hydrogenation of 4-nitrophenol, respectively. Most importantly, Pd/alk-Ti3C2X2exhibits excellent stability and recyclability in both reactions without any promoters. The superior property of Pd/alk-Ti3C2X2makes it as a potential material for practical applications.Keywords:palladium;titanium carbide;catalytic transformation;4-chlorophenol;4-nitrophenol
研究领域:
材料科学
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环境科学
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催化化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Analysis and Testing
·
2023
·Vol. 8
·期 2
·201-209
·
IF 4.7
Yang Jing,Liu Hao,Huang Yan,Li Li,Liu Huajie,Ding Yaping
An “on–off–on” fluorescence sensor was designed for rapidly and consecutively detecting 4-nitrophenol and cerium(IV) without the use of any labeling materials. The yellow carbon dots were synthesized by a simple one-step hydrothermal approach, and various techniques were applied to investigate the morphology, structure, and optical properties of the carbon dots. Under the optimal experimental conditions, 4-nitrophenol rapidly quenched the fluorescence of carbon dots as a result of the inner filter effect (IFE). The fluorescence intensity of carbon dots was linear with the concentration of 4-nitrophenol (1–150 μmol/L) and the limit of detection was 0.32 μmol/L. The fluorescence was gradually recovered as the cerium(IV) concentration (0.5–100 μmol/L) increased in CDs/4-NP, and the limit of detection was 0.16 μmol/L. The sensor showed good selectivity and demonstrated high accuracy for the analysis of 4-nitrophenol and cerium(IV) in actual water samples.
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Hairus Abdullah,Noto Susanto Gultom,Hardy Shuwanto,Worku Lakew Kebede,Dong-Hau Kuo
Zn(O,S) has been successfully doped with different amounts of Ho and characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and transient photocurrent (TPC). The as-prepared Ho-doped Zn(O,S) catalysts with different Ho amounts are evaluated for hydrogen evolution reaction. The catalyst with the best performance in evolving hydrogen is further utilized to hydrogenate 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). It is found that doping with Ho obviously enhanced charge transfer and photoresponse properties of the catalyst. Therefore, the modified Zn(O,S) can optimally evolve hydrogen by 18 624 μmol/g, which is 20% higher than that of pristine Zn(O,S). Subsequently, the in situ generated hydrogen ions on catalyst surfaces also play an important role as a hydrogen source to hydrogenate 4-NP to 4-AP without any reducing agents such as NaBH4, which is commonly used as a hydrogen source. As Ho is doped in the lattices of Zn(O,S), it acts not only to separate photocarriers and to enhance the charge transfer but also to shorten the diffusion time of nitrophenolate ions to catalyst surfaces for further photocatalytic hydrogenation reaction (PHR) process. A plausible PHR mechanism has been provided to elucidate the great performance of Ho-modified Zn(O,S) for photocatalytic hydrogenation.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Hejie Qin,Daqiang Yin,Joel Z. Bandstra,Yuankui Sun,Guomin Cao,Xiaohong Guan
In this study, Fe 2+ addition was employed to overcome the negative effects of humic acid (HA) on contaminant removal by zerovalent iron (ZVI), and its feasibility to improve electron efficiency of ZVI was also tested. HA at high concentrations suppressed the removal of 4-nitrophenol (4-NP) by ZVI, while the addition of 0.25–1.0 mM Fe 2+ could greatly mitigate this inhibitory effect and enhance 4-NP reduction. Specifically, with a mixed-order model, global fitting results showed that the addition of Fe 2+ increased the rate constant from 0.124 × 10 −2 –0.219 × 10 −2 mM/min to 0.227 × 10 −2 –0.417 × 10 −2 mM/min and shortened lag period from 19.7–47.9 min to 8.0–15.2 min for 4-NP removal. The mechanistic investigation revealed this trend could be explained by the following aspects: i ) Fe 2+ can facilitate the generation of Fe(II)-containing oxides, which can act as an electron mediator or direct electron donor for 4-NP reduction; ii ) the presence of Fe 2+ could lead to aggregation of HA particles and accordingly reduced its coverage on ZVI surface. But the results of respike experiments indicate that Fe 2+ addition did not show remarkable effect on the electron efficiency of 4-NP by ZVI, which should be associated with that Fe 2+ was not able to favor the enrichment of 4-NP on ZVI surface.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yiqi Liu,Gang Xue,Yaqian Ma,Lei Ding,Yanli Kong,Yang Gao,Zhonglin Chen
4-Nitrophenol (4-NP) removal using prepared molecular imprinting polymers (MIPs) as a specific adsorbent was investigated. On the basis of single-factor experiment, Box–Behnken statistical experiment design (BBD) and response surface methodology (RSM) were used to investigate the influence of MIPs dosage, initial concentration of 4-NP, pH and temperature of the solution, and their potential interaction effect on 4-NP removal. The quadratic polynomial regression model of response value Y (4-NP removal efficiency) was established based on the BBD experiment al results. The reasonable and reliable of regressive of the model was confirmed by the analysis of variance test and residuals analysis (R 2 = 0.9952). The RSM model indicates that all single-factors had a significant effect on 4-NP removal. The interaction effect between MIPs dosage and temperature, temperature, and pH were not significant but the other four interaction effects were significant. The regression model showed an optimum removal of 79.63%, while 78.39% removal was obtained from batch experiments at the optimum conditions suggested by the regression model, which reconfirmed the validity of the model. The results demonstrated that prepared MIPs possessed a strong adsorption ability for 4-NP removal, allowing a possible practical application in future water treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ANALYST
·
2021
·Vol. 146
·期 24
·7593-7600
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IF 4.616
Ling Lei,Caoling Li,Wensheng Huang,Kangbing Wu
Developing a sensitive and rapid detection method for 4-chlorophenol (4-CP) and 4-nitrophenol (4-NP) is very important due to their high toxicity. In this work, bulk Ti3AlC2 powder was etched to Ti3C2Tx for the first time through a hydrothermal reaction in NaF/HCl solution. After ultrasonication in N-methylpyrrolidone (NMP), Ti3C2Tx powder was successfully exfoliated into multilayered Ti3C2Tx nanosheets (i.e. Ti3C2Tx MXene). The prepared Ti3C2Tx MXene not only has a large electrochemical surface area for the oxidation of 4-CP and 4-NP, but also lowers their electron transfer resistance. As a result, the oxidation signals of 4-CP and 4-NP are significantly improved on the surface of the Ti3C2Tx MXene. Based on the remarkable signal amplification of the Ti3C2Tx MXene, a sensitive and rapid method was developed for the simultaneous detection of 4-CP and 4-NP. The linear range is from 0.1 to 20.0 μM for 4-CP, and from 0.5 to 25.0 μM for 4-NP, with detection limits of 0.062 μM (4-CP) and 0.11 μM (4-NP). This method was used in wastewater samples, and the accuracy was confirmed to be good by high-performance liquid chromatography.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 30
·e2401452121
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IF 9.4
Shujun Liu,Hong Wang,Zehui Hu,Xin Zhang,Yanjuan Sun,Fan Dong
Nitrophenols present on the surface of particulates are ubiquitous in the atmosphere. However, its atmospheric photochemical transformation pathway remains unknown, for which the crucial effect of visible light is largely overlooked, resulting in an incomplete understanding of the effects of nitrophenols in the atmospheric environment. This study delves into the photolysis mechanism of 4-nitrophenol (4NP), one of the most abundant atmospheric nitrophenol compounds, on the surface of photoactive particulates under visible light irradiation. Unexpectedly, the nonradical species (singlet oxygen, 1O2) was identified as a dominant factor in driving the visible photolysis of 4NP. The pathways of HONO and p-benzoquinone (C6H4O2) generation were clarified by acquiring direct evidence of C–N and O–H bond breakage in the nitro (–NO2) and hydroxyl (–OH) groups of 4NP. The further decomposition of HONO results in the generation of NO and hydroxyl radicals, which could directly contribute to atmospheric oxidizing capacity and complicate the PM2.5 composition. Significantly, the behavior of 1O2-induced visible photolysis of 4NP was universal on the surface of common particulates in the atmosphere, such as A1 dust and Fe2O3. This work advances the understanding of the photochemical transformation mechanism of particulate-phase atmospheric nitrophenols, which is indispensable in elucidating the role of nitrophenols in atmospheric chemistry.
研究领域:
环境科学
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大气化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 33
·期 3
·035601
·
IF 3.874
Jian-Hang Yin,Mengxuan Liu,Lei Meng,Nai-Di Tan,Na Xu
In this work, we reported a facile reduction approach for fabrication of water-soluble and ultrabright Cu nanoclusters with core–shell structure. A certain amount of reducing agent as NaBH4 was introduced into the polyethyleneimine-stabilized Cu nanoclusters (CuNCs@PEI) system, which exhibited 4-fold fluorescence enhancement along with a blue shift of the emission peak. The variations of morphology, valence states and functional groups demonstrated that a Cu shell was formed surround CuNCs (defined as CuNCs-Cu@PEI), attributable to metal complex (PEI-Cu+ and PEI-Cu2+) reduction. The effect of core–shell morphology on luminous and electron relaxation mechanism of CuNCs-Cu@PEI was investigated via temperature-dependent steady and time-resolved fluorescence measurements. The CuNCs-Cu@PEI with a high fluorescence quantum yields of 22.59% were able to homogeneously disperse in aqueous phase, indicating their potential applications in biological labeling, sensing and in vivo imaging. Finally, the CuNCs-Cu@PEI was employed as a fluorescence probe to determine 4-nitrophenol, of which the detection limit was much lower than initial CuNCs@PEI.
研究领域:
材料科学
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分析化学
·
生物医学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 10
·6481-6498
·
IF 5.044
Lang Daning,Shi Ming,Xu Xia,He Shixue,Yang Chao,Wang Lu,Wu Ronglan,Wang Wei,Wang Jide
Abstract 4-Nitrophenol is a highly toxic environmental pollutant. It is a challenge to selectively remove it from a mixture of various pollutants. Herein, we report a study on the selective adsorption of 4-nitrophenol by using molecularly imprinted polymers (MIPs). The imprinted polymer was synthesized using cellulose as a framework, onto which, the complex of the imprinting molecule (i.e., 4-nitrophenol) and a candidate material [namely, 2-(dimethylamino)ethyl methacrylate. DMAEMA] was grafted. The obtained MIP showed an excellent adsorption capacity with good selectivity. Also, the adsorption of 4-nitrophenol by the obtained MIP was fast and the adsorbent exhibited good recyclability. The thermodynamics and kinetics of the adsorption process of 4-nitrophenol by MIP was thoroughly studied, where an otherwise-equivalent non-imprinted polymer was used as a control in the experiments. The selectivity of the MIP adsorbent for 4-niteophenol was evaluated by two types of experiments: (1) adsorption experiments in single-component adsorbate systems (containing 4-nitrophenol, 3-nitrophenol, catechol, or hydroquinone), and (2) competitive adsorption experiments in binary adsorbate systems (containing 4-nitrophenol plus either 3-nitrophenol, catechol or hydroquinone). The selectivity coefficient for 4-nitrophenols was twice of those of other phenols (that were all around 2), indicative of the extent of the affinity of MIPs to these phenolic compounds. The recyclability of the adsorbent was evaluated for 5 adsorption–desorption cycles, where the adsorption capacity of the last cycle remained over 90.2% of that of the first cycle. Graphic Abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2016
·
IF 2.299
Libo Sun,Xun Sun,Yuhua Zheng,Qingquan Lin,Huijuan Su,Caixia Qi
Herein, polystyrene/polyaniline/Au (PS/PANI/Au) composites were prepared by a novel method using self-made Au(en) 2 Cl 3 as the Au source and were used as the catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). Before the preparation of PS/PANI/Au, PS microparticles were sulfonated by the copolymerization between styrene and sodium 4-styrenesulfonate (SSS). Then self-made Au(en) 2 Cl 3 was added and Au(en) 2 3+ species were adsorbed on the surface of sulfonated PS particles due to the electrostatic attraction. The Au(en) 2 3+ was then reduced to Au nanoparticles in situ by aniline monomer. After the polymerization of the residual aniline monomer by ammonium persulfate (APS), the PS/PANI/Au composite catalysts were obtained. The morphology and structure of the as-prepared PS/PANI/Au composites were characterized by TEM, FT-IR, XPS and EDX. Their catalytic performance for the reduction of 4-NP by NaBH 4 was evaluated by means of UV–vis spectroscopy. The as-prepared PS/PANI/Au composites are very active for the reduction of 4-NP by virtue of the interaction between Au nanoparticles and PANI shell. The catalytic reaction obeys the pseudo-first-order reaction equations and the reaction rate constants are also calculated in this paper.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Sai Kumar Tammina,Yaling Yang
Here in, the fluorescent nitrogen doped carbon dots (N-CDs) were synthesized by microwave digestion method using glucosamine and ethylenediamine as raw materials for carbon and amine sources. Correspondingly, N-CDs formation was further confirmed through XPS, XRD, TEM and FT-IR techniques. And the optical properties were further investigated using fluorescence and UV–vis spectrophotometry. The synthesized N-CDs were used to explore its sensing ability against 4-nitrophenol (4-NP), Cr(VI), and Ascorbic acid. The sensing strategies of 4-NP, Cr(VI) and Cr(VI)/ascorbic acid had showed the promising detection limits such as 0.05, 0.08 and 0.15 μM respectively. The investigation related to the fluorescence emission quenching of N-CDs against 4-NP and Cr(VI) were attributed to the inner filter effect (IFE), however in case of AA sensing strategy, it was due to the weakening on IFE, results in restoring of fluorescence emission from 0.25 to 175 μM concentration range of AA against N-CDs/Cr(VI) fluorescent probe. Whereas to assess the practicality of the detection strategy, real sample analysis was also performed, which showed the acceptable rates of recoveries and relative standard deviations towards N-CDs/Cr (VI) and N-CDs/Cr(VI)/AA probes. All in all, the reported N-CDs can be utilized in environmental and biological applications.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD AND AGRICULTURAL IMMUNOLOGY
·
2023
·
IF 3
Jiannan Chen,Xiuhua Xia,Peizhen Li,Hang Yu,Yunfei Xie,Yahui Guo,Weirong Yao,He Qian,Yuliang Cheng
As a type of environmentally deleterious compound, 4-nitrophenol (4-NP) has become a global concern due to its extreme toxicity to aquatic organisms and humans. Herein, we used naturally available crayfish shells as precursors to prepare a new type of carbon dots (CDs) by the hydrothermal method. The as-synthesized CDs exhibited strong blue fluorescence emission which can be sensitively quenched by 4-NP through the static quenching effect because of the formation of a ground state complex between CDs and 4-NP. Accordingly, a facile and rapid fluorescence sensor was developed to detect 4-NP from 0 μM to 50 μM with a limit of detection (LOD) of 0.16 μM. Furthermore, the proposed sensor was successfully applied for the detection of 4-NP in fresh crayfish meat and aquatic water samples.
研究领域:
环境科学
·
分析化学
✓ 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）