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
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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
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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
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化学工程
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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
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
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产品关联
DOI
高影响因子
International Journal of Environmental Science and Technology
·
2015
·Vol. 13
·期 1
·113-124
·
IF 2.19
Wang Z.,Ye C.,Wang H.
Amino group exhibits alkaline properties. Amino functionalized imidazole-modified silicas would benefit the adsorption of phenolic compounds. Coupling agent between the silica and the imidazolium ring has an effect on adsorption performance. In this paper, two adsorbents were synthesized for the surface bonding of N -(3-aminopropyl)-imidazole onto silicas modified by 3-chloropropyltriethoxysilane and 3-mercaptopropyltrimethoxysilane, respectively. Infrared spectra, elemental analysis, thermogravimetric analysis and N 2 adsorption–desorption isotherms were used to characterize the two adsorbents, and their adsorption capacities of 2,4-dinitrophenol from aqueous solutions were investigated in detail. The experimental results indicated that amino group plays an important role in the enhancement of adsorption capacities of 2,4-dinitrophenol. The adsorbent with 3-mercaptopropyltrimethoxysilane as coupling agent exhibited lower adsorption capacity due to a weak electron–electron repulsion between the non-bonding electrons of sulfur atom and π electrons of benzene ring of 2,4-dinitrophenol. The adsorption kinetics fitted well with pseudo-second-order model. The two adsorbents could be regenerated and reused eight times at least by washing with HCl. The adsorption mechanism was also discussed.
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
ADSORPTION SCIENCE & TECHNOLOGY
·
2018
·
IF 0.609
Hua-jun Chen,Wenjie Tian,Wuxiu Ding
Herein active manganese dioxide was prepared by different methods using KMnO4 and MnSO4·H2O as inorganic precursors. The impact of preparation methods on morphology and adsorption performance of the synthesized products was investigated. The experimental results show that the reaction temperature and pressure had a great effect on the morphology and adsorption performance of active manganese dioxide. The shape of active manganese dioxide prepared at room temperature and pressure was short rod-like while active manganese dioxide synthesized by hydrothermal method was mesoporous fibers and had better adsorption performance. The adsorption behavior of 2,4-dinitrophenol on mesoporous manganese dioxide was well described by Langmuir and Freundlich isotherm equation (R2>0.99) and pseudo-second-order kinetic equation (R2>0.99), so the adsorption process maybe a chemical and monolayer adsorption. The pH of solution had significant effect on the adsorption performance of 2,4-dinitrophenol on mesoporous manganese dioxide. The adsorption capacity was 2.539 mg/g in the condition of pH = 7.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS ES&T Water
·
2023
·
IF 5.3
Li Gao,Yuan Wang,Yitong Lu,Xue Ma,Wenjie Zhao
Dual-purpose ferric chloride was successively used as a catalyst and iron source for ferric oxide to conveniently prepare a magnetic Fe3O4/HCPBn-glu polymer with tetrabenzylglucose as the precursor. First, ferric chloride was employed as a Friedel–Crafts reaction catalyst for the synthesis of hyper-cross-linked HCPBn-glu. Subsequently, the ferric chloride was utilized as an iron source for the synthesis of Fe3O4 magnetic nanoparticles by coprecipitation, which anchored Fe3O4 nanoparticles onto the HCPBn-glu skeleton. A variety of modern analytical techniques were used to characterize prepared Fe3O4/HCPBn-glu. The effects of adsorbent amount, contact time, and pH were studied, and this composite showed excellent adsorption performance for 2,4-dinitrophenol (DNP), with a maximum adsorption capacity of 83.3 mg/g and removal efficiency of 91.7%. The adsorption of DNP is well fitted by the Freundlich model, indicating multilayer adsorption. The adsorption kinetics obey a pseudo-second-order kinetic model. In addition, Fe3O4/HCPBn-glu can be reused for at least six cycles with an acceptable removal efficiency, making it an economically valuable adsorbent. The adsorption mechanism was also discussed, and hydrogen bond, hydrophobic, and π–π interactions may be responsible for DNP adsorption. Based on these results, Fe3O4/HCPBn-glu can be utilized as an effective adsorbent for the removal of nitrophenols from sewage.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2014
·
IF 2.637
Cunling Ye,Xueyuan Wang,Heping Wang,Zhike Wang
Three 4-methylimidazolium-modified silica adsorbents with different counter anions such as BF 4 − , PF 6 − and Tf 2 N − (named as SilprM 4 ImBF 4 , SilprM 4 ImPF 6 and SilprM 4 ImTf 2 N, respectively) were prepared and characterized. Three types of adsorbents were used to remove 2,4-dinitrophenol (2,4-DNP) from aqueous solutions under static and dynamic conditions. It was found that the adsorption capacity of 2,4-DNP increases according to the order: SilprM 4 ImTf 2 N < SilprM 4 ImPF 6 < SilprM 4 ImBF 4 , which was opposite to the van der Waals volume of these counter anions and consistent with the hydrophilicity of these counter anions. The reason could be related that counter anions with large van der Waals volume would have large space steric hindrance and be unfavorable for the anion exchange reaction. Counter anions with good hydrophilicity would dissociate from these materials easily and the anion exchange reaction could easily take place. Under dynamic conditions, the geometry shape of counter anions could affect the recovery yields of 2,4-DNP. Tetrahedron such as BF 4 − and Tf 2 N − had similar recovery yields of 2,4-DNP, while regular octahedron such as PF 6 − had slightly low recovery yields.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 41
·49236
·
IF 2.52
Guohao Cheng,Wenna Yu,Can Yang,Shiying Li,Xiaoyue Wang,Peiyun Wang,Kaige Zhang,Xiang Li,Guifen Zhu
In this work, 2,4-dinitrophenol (2,4-DNP), a new molecularly imprinted polymer (MIP) with excellent performance was synthesized in ethanol by the sol–gel method using 3-aminopropyltriethoxysilane as functional monomer on the surface of silica particles. The structure and morphology of MIP were characterized via scanning electron microscopy, nitrogen adsorption–desorption analysis, infrared spectra, and thermogravimetry analysis. Results demonstrated that MIP had excellent selectivity toward the template molecule (2,4-DNP) with an imprinting factor of 9.55 and a maximum static adsorption capacity of 114.7 mg g −1 . Data obtained from the adsorption isotherm of 2,4-DNP were fitted well with the Freundlich isotherm model, and the adsorption process can be described by the pseudo-second-order model. The investigation of adsorption mechanism revealed that the specific recognition process of MIP toward 2,4-DNP was dominated by the hydrogen bond and molecular structure. By employing as a sorbent, the as-prepared MIP was applied to recognize and remove 2,4-DNP in poster paper, nonwoven fabric and brown curtain with recoveries in the range from 85.74 to 100.00%. However, the MIP can effectively remove 2,4-DNP after five cycles.
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
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2024
·
IF 2.3
Ou Sha,Xincheng Dai,Huiwen Li,Xiaobing Chen,Yunfan Wu,Yuan Xu,Jing Kong,Ziwen Wang,Zimeng Liu,Renxiang You
In this study, a core-shell magnetic molecularly imprinted polymers (MMIPs) adsorbent targeting 2,4-dinitrophenol (2,4-DNP) as a template molecule was developed by surface polymerisation and applied for magnetic solid-phase extraction prior to the determination of 2,4-DNP in environmental water samples via high-performance liquid chromatography. Different experiments were carried out to optimise the magnetic solid-phase extraction conditions. Subsequently, the adsorption capacity and selectivity of prepared MMIPs were investigated. Theoretical analysis demonstrated that the experimental data fitted well to the pseudo-second-order model, suggesting that chemical adsorption might be the rate-limiting step, with a maximum adsorption capacity of 21.76 mg g−1. Under the optimised conditions, this method showed relatively wide linearity within the concentration range of 0.0025 μg·mL−1−0.5 μg·mL−1, with a relative standard deviation of 2.5%–6.2%. The detection limit and quantification limit were 0.23 µg·L−1 and 0.76 µg·L−1, respectively.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xia Hua,GenLai Du,Jian Han,Yong Xu
A basic scheme of using 2,4-dinitrophenol (2,4-DNP) as an uncoupler between electron transport chain and oxidative phosphorylation for the biochemical regulation of Gluconobacter oxydans (G. oxydans) is raised. Under the weakly acidic environment, the lipophilic 2,4-DNP as an uncoupling agent destroys the electrochemical proton (H+) gradient in mitochondria, which leads to a loss of the driving force for adenosine triphosphate (ATP) synthesis. Based on the main enzyme system of G. oxydans, four typical substrates were studied for exploring the biochemical effects of uncoupling on the cells. As a result, it was found that under uncoupling conditions, cells receive a feedback signal of ATP deficiency, which promotes the utilization of catabolized substrates such as sorbitol and glucose through the substrate level phosphorylation pathway in order to make up for the deficiency of ATP. The proposal of strategy has a further understanding of the basic biochemical knowledge of G. oxydans and lays a theoretical foundation for the directional regulation of G. oxydans.
研究领域:
生化工程
·
微生物生物技术
·
代谢工程
✓ 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）