Desalination and Water Treatment
·
2015
·
IF 1.173
Lu Mao,Jiaojun Shen,Xiaoliang Ma,Zhonghui Lan,Xu Zhang
Photocatalytic degradation of 2,4-dinitrophenol in two commercial TiO2 (Degussa P25 and Hombikat UV-100) was investigated in this work. The properties of two TiO2 were systematically studied and described in detail. The observed photoactivity of Degussa P25 was 6–12 times higher than Hombikat UV-100 although the specific surface area of Hombikat UV-100 was 5.7 times more than that of Degussa P25. The photodegradation of 2,4-dinitrophenol was favored at neutral pH in Degussa P25, while its degradation was preferred at pH 3.0 in Hombikat UV-100 dispersion. The observed kinetic constant (kobs) for the photodegradation of 2,4-dinitrophenol in 20 mg/L humic acid solution was found to be 15% (Degussa P25) and 21% (Hombikat UV-100) of the values obtained from the corresponding pure aquatic solutions. The suppression effects of β-cyclodextrin on the photodegradation of 2,4-dinitrophenol over Degussa P25 (50%) was much more significant than that of Hombikat UV-100 because of the different adsorption behavior of β-cyclodextrin over two TiO2. Hydroxyl radical and valance band hole was found to be the predominant reactant during the degradation of 2,4-dinitrophenol using P25 and UV-100, respectively. Formic acid, acetic acid, oxalic acid, and were detected as advanced oxidation products.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Xiaoliang Ma,Hong Peng,Xu Zhang
This study systematically investigated the adsorption properties of 2,4-dinitrophenol (DNP) on granular activated carbon (GAC), and the performance of ultraviolet (UV) light irradiation and solvent extraction in the regeneration of spent adsorbent. It also evaluated the influence of such regeneration on the change of GAC surface properties. The adsorption followed a pseudo-second-order kinetic model and was controlled by the intra-particle diffusion rate process. With an adsorption capacity of 1,476 μM (272 mg/g), the adsorption of DNP onto GAC fit the Dubinin–Astakhov mode better than it did the Freundlich and Langmuir isothermal models. These results indicate that the adsorption occurred not only on the surface, but also in the micropores and mesopores. The regeneration efficiency of spent GAC was less than 10% using either UVC or vacuum UV irradiation, which was probably because the irradiated light could not directly enter the pores to induce the degradation of the adsorbed DNP. The levels of regeneration efficiency by ethanol extraction and acetic acid extraction were 60 and 100%, respectively, in the first cycle. The surface area was slightly decreased, while the porosity and surface composition were maintained after solvent extraction.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 56
·32425-32434
·
IF 3.049
Zhike Wang,Honglian Ge,Xueyuan Wang,Cunling Ye,Shunli Fan
Ionic liquid modified silicas with high adsorption capacity for phenols prompt us to deeply explore the contribution of interactions between the adsorbent and adsorbate, with a particular focus on hydrophobicity, π–π, electrostatic and acid–base interactions. Herein, by introducing a series of typical substituent groups including N,N-dimethylaminopropyl (A), benzyl (B), dodecyl (D) and naphthylmethyl (N) in an imidazole ring (Im), three mono-immobilized and two co-immobilized imidazolium ionic liquid modified silicas, namely SilprAImCl, SilprBImCl, SilprNImCl, SilprDBImCl and SilprDAImCl, werre synthesized for removal and recovery of 2,4-dinitrophenol (2,4-DNP) from aqueous solutions. Adsorption kinetics, isotherms, thermodynamic analysis and desorption experiments have been carried out. The experimental results reveal that the substituent groups such as N,N-dimethylaminopropyl, benzyl and naphthylmethyl on the imidazole ring can significantly enhance the adsorption of 2,4-DNP via the acid–base interaction or π–π interaction and the adsorption capacity of 2,4-DNP follows the order: SilprNImCl > SilprAImCl > SilprBImCl. Furthermore, SilprDBImCl exhibits the largest adsorption capacity and SilprDAImCl has the lowest among the five adsorbents. These interesting finds indicate that the combination of hydrophobicity and π–π interactions lead to enhanced adsorption performance towards 2,4-DNP, while the combination of the hydrophobicity and acid–base interactions can restrain greatly adsorption of 2,4-DNP from aqueous medium. Adsorption mechanisms of 2,4-DNP on the five adsorbents have been clarified. These results will provide a deeper insight for efficient removal of phenols from water environments.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Zhiyuan Meng,Jie Yin,Fei Zhao,Mingxin Li,Yan Zhang,Yueyin Liang,Zhonglong Wang,Yiqin Yang
2,4-Dinitrophenylhydrazine (DNPH) is widely present in the ecological environment and has great harmful effects on humans, so it is necessary to detect DNPH in environmental samples. Chitosan, the second abundant renewable biological material in natural, has the advantages of wide sources, good biodegradability and good biocompatibility. Naphthalimide is a kind of classical fluorophore and has widely applications in fluorescent probe field. In this paper, a new fluorescent probe CTS-NA-OAc for DNPH detection was developed, which was constructed by using chitosan as skeleton and naphthalimide as the fluorophore. This probe displayed a highly specific “turn-off” fluorescence response toward DNPH, accompanied by the fluorescence color change from green to colorless. Its detection limit for DNPH was calculated to be 4.9 × 10 −7 M and much lower than that of the corresponding model compound NA-OAc . The interference experiments showed that other competing analytes have no influence on the detection of DNPH in a complex environment. In addition, the coordination mechanism of CTS-NA-OAc with DNPH was investigated by 1 H NMR titration and DFT calculations. Inspired by the above prominent performances, the probe CTS-NA-OAc was successfully applied to the detection of DNPH in real water and soil samples.
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Shuangying Li,Qingxiang Zhou,Zhi Li,Menghua Liu,Yanhui Li,Chunmao Chen
2,4-Dinitroaniline is a multifunctional product and has been applicated in various fields. It has absorbed much concerns due to its large consumption and occurrence in many environmental matrices. It is urgent to explore reliable and sensitive measurement technology. Present study described an outstanding fluorescence sensor constructed with carbon dots (CDs) derived from vitamin B 1 . The CDs were fabricated by dealing with a facile hydrothermal process, and exhibited good water solubility, fluorescence stability and highly fluorescence quenching characteristics in presence of 2,4-dinitroaniline. The excitation and emission wavelengths of the obtained CDs were 305 and 378 nm, respectively. The sensor displayed good selectivity and sensitivity for 2,4-dinitroaniline. Good linearity can be achieved in two-stage of 0.2–3 μmol L −1 and 3–20 μmol L −1 . The sensor earned low detection limit for 2,4-dinitroaniline down to 0.05 μmol L −1 . The sensor has been commendably employed for analysis of 2,4-dinitroaniline in real aqueous samples with spiked recoveries in the range of 95.0–99.6%. The proposed sensor provided a promising alternative for analysis of environmental pollutants or other meaningful employment.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2024
·Vol. 25
·期 1
·34
·
IF 3.4
Yalun Dong,Liyue Wang,Wenfang Liang,Jiqin Zhu,Lu Sun,Long Yi
Glutathione (GSH) plays a crucial role in various physiological processes and its imbalances are closely related to various pathological conditions. Probes for detection and imaging of GSH are not only useful for understanding GSH chemical biology but are also important for exploring potential theranostic agents. Herein, we report a fast intramolecular thiol-activated arylselenoamides (FITA)-based fluorescent probe using 2,4-dinitrophenyl alkylthioether as a sulfydryl-selective receptor for the first time. The fluorescence of the probe was low due to the double effects of PET, while the probe exhibits an 86-fold fluorescence enhancement at 460 nm after GSH activation and a detection limit of 0.95 μM. Furthermore, the probe is low-toxic and capable of imaging cellular GSH. This work further expands the design and applicability of theFITA-based platform, offering a new thiol-deprotection strategy for development of fluorescent probes.
研究领域:
生物化学
·
医学诊断
·
化学生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2013
·
IF 3.925
Zhike Wang,Cunling Ye,Juan Li,Heping Wang,Han Zhang
The objective of this work was to improve the understanding the influence of the methyl group at different positions of imidazolium ring on the adsorption behaviors of imidazole-modified silica adsorbents. Five adsorbents named as SilprImCl, SilprM 1 ImCl, SilprM 2 ImCl, SilprM 4 ImCl and SilprM 1 M 2 ImCl were synthesized using imidazole , 1-methylimidazole, 2-methylimidazole, 4-methylimidazole and 1,2-dimethylimidazole, respectively. These adsorbents were characterized by scanning electron microscope, infrared spectra, thermogravimetric analysis, elemental analysis and BET analysis. Firstly, phenol, 2-nitrophenol (2-NP), 3-nitrophenol (3-NP), 4-nitrophenol (4-NP) and 2,4-dinitrophenol (2,4-DNP) were used as adsorbates to investigate the selectivity of SilprImCl and its adsorption capacities followed the order of 2,4-DNP ≫ 4-NP > 2-NP ≫ 3-NP > phenol. Therefore, 2,4-DNP was used to investigate the adsorption behaviors of the five adsorbents. It was inferred that the adsorbents are of primary anion-exchange and electrostatic nature. The electrostatic nature was affected significantly by the methyl group at different positions of imidazolium ring. The adsorbed amounts of 2,4-DNP decreased in the order of: SilprM 1 M 2 ImCl ≈ SilprM 1 ImCl > SilprM 4 ImCl > SilprM 2 ImCl > SilprImCl. The adsorption–elution experiments indicated that 2,4-DNP can be removed from aqueous solutions by a SilprM 4 ImCl packed column and the recovery of 91.6% was obtained. The adsorbent could be regenerated and reused ten times at least by simple washings with HCl and water in turn.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 7
·1-9
·
IF 5.479
Sun Jiangjiang,Wang Qin,Yang Jiajun,Zhang Jianjian,Li Zheng,Li Hua,Yang Xiao-Feng
The authors describe a carbon dot-based fluorescent probe for biothiols. Green emissive carbon dots (g-CDs; with λ ex /λ em maxima of 407/505 nm) were synthesized by a one-step solvothermal method starting from 3-diethylaminophenol. They were then covalently functionalized with 2,4-dinitrobenzenesulfonyl chloride to afford 2,4-Dinitrobenzenesulfonate-functionalized CDs (g-CD-DNBS) as a nanoprobe for biothiols. The fluorescence of the g-CD-DNBS is quite weak. Upon addition of biothiols, the DNBS group of the probe is removed by thiol groups. This results in gradual restoration of the green fluorescence. The nanoprobe exhibits high selectivity for biothiols over other amino acids and biological molecules. The detection limits for cysteine, homocysteine and glutathione are 69, 74 and 69 nM (S/ N = 3), respectively. The probe was applied to image biothiols in SMMC-7721 cells.
Schematic presentation of the mechanism of 2,4-dinitrobenzenesulfonate-functionalized carbon dots (g-CD-DNBS) for the detection of biothiols. g-CDs: green emissive carbon dots.
研究领域:
生物化学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 43
·20699-20710
·
IF 3.925
Die Wang,Luminita Marin,Xinjian Cheng
Nitro compounds are widely used in modern industries. Among them, 2, 4-dinitrophenylhydrazine (DNH) is extremely harmful. It is of great significance to develop methods for the detection of DNH. In this work, chitosan was used as the substrate material, and fluoroborondipyrrole (BODIPY) was used as the fluorophore. Chitosan was endowed with the fluorescence sensing ability by the introduction of BODIPY units. First, BODIPY derivatives (NO-3 and BO-1) with an alkynyl group (CC) were synthesized. Second, small molecules NO-4 and BO-2 with an aldehyde group (–CHO) were obtained. Finally, the –NH2 groups on chitosan underwent a click reaction (–NH2/CC) and a Schiff base formation reaction occurred (–NH2/–CHO) to form three polymer probes C1, C2 and C3. CC formed in the click reaction can interact with DNH and can be used as recognizing sites for DNH. These chitosan probes have good thermal stability and could selectively recognize DNH, showing notable fluorescence quenching effects, which are visible to the naked eye. DNH is a typical electron-deficient compound, and the polymer fluorescent probe contains electron-rich groups, which makes it easier for the two species to combine and cause fluorescence changes. C1 is flexibly cross-linked, C3 is rigidly cross-linked, and C2 has a non-crosslinked structure, and they show different rheological properties. This work expands the application of chitosan.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2020
·
IF 4.613
Yujiao Tu,Suping Wang,Xiaotian Yuan,Yunlin Wei,Kunhao Qin,Qi Zhang,Xuemei Chen,Xiuling Ji
The highly fluorescent nitrogen, phosphorus carbon dots ( Gl N,P-CDs) and G l CDs deriving from Ganoderma Lucidum were successfully prepared by a simple hydrothermal method . The Gl N,P-CDs exhibited low biotoxicity and good biocompatibility by cell imaging , onion skin staining and in vivo bioimaging . In addition, Gl N,P-CDs and G l CDs showed high selectivity and sensitivity in detecting 2,4-dinitrophenol (2,4-DNP) and 4-nitrophenol (4-NP). Good linear range 0–37.5 μM (R 2 = 0.9923) and 0–50 μM (R 2 = 0.9944) for Gl CDs, and 0–30 μM (R 2 = 0.9914) and 0–30 μM (R 2 = 0.9976) for Gl N,P-CDs were obtained, and the low detection limits were 89.77 nM, 100.27 nM ( Gl CDs) and 73.03 nM, 68.09 nM ( Gl N,P-CDs) for 2,4-DNP and 4-NP, respectively. It revealed that the inner filter effect dominated in quenching of the Gl CDs and Gl N,P-CDs fluorescent by 2,4-DNP and 4-NP. The Gl N,P-CDs was successfully used to detect 2,4-DNP and 4-NP in real water and soil samples. It provided a new insight on the bioimaging application and environmental pollutants detection.
研究领域:
材料科学
·
环境科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 22
·2575-2587
·
IF 2.073
Rui Huang,Wenyan Wu,Shuyu Shen,Jiawen Fan,Yue Chang,Shiguo Chen,Xingqian Ye
The content of flavonoids is important for evaluating the quality of citrus-related products. However, due to the different characteristics of the structures of flavonoids and the lack of a universal method, many methods for quantification have been misused. Here, we used twenty-one citrus flavonoid standards to evaluate four widely used colorimetric methods, and seven species of citrus as natural samples were used to verify the evaluation. The results indicated that NaNO2–Al(NO3)3–NaOH and AlCl3 methods could only detect some of the flavonoids and were inadequate to estimate the total flavonoid content, and the 2,4-dinitrophenylhydrazine (2,4-DNPH) method might be affected by other carbonyl compounds in extracts. The Davis method was modified with naringin as the standard at a measuring wavelength of 420 nm for grapefruit and pomelo, and with hesperidin as the standard at a measuring wavelength of 360 nm for other species. It was proved to be the most reliable method for the quantification of citrus flavonoids and was also recommended for laboratories and factories where needed.
研究领域:
食品科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2021
·
IF 4.291
Xinyue Jiao,Luminita Marin,Xinjian Cheng
2,4,6-trinitrophenol (TNP) and 2,4-dinitrophenylhydrazine (DNH) are harmful to the environment and human beings. Trace detection of TNP and DNH is worth of developing facile methods. In this work, cellulose powder and filter paper based fluorescence sensor are synthesized. Firstly, NH 2 CH 2 CH 2 – was introduced into cellulose through etherification reaction, and at the same time, a small molecule BODIPY with –CHO was synthesized. Then BODIPY was incorporated into cellulose by Schiff base reaction to obtain fluorescent macromolecular probes. These fluorescent cellulose sensors can efficiently identify TNP and DNH, with the lowest detection limits of 2.8 × 10 −7 M and 1.6 × 10 −7 M, respectively. Fluorescent filter paper is obtained via the same route. They also exhibit TNP and DNH identification ability. The method developed in filter paper not only expands the application range of cellulose, but also can efficiently identify the pollutants TNP and DNH, which is of great significance in theory and practical applications.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）