JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Lanxingyu Liu,Xingtao Zuo,Jiajie He,Yun Zhou,Juan Xiong,Cong Ma,Zhongbing Chen,Shuili Yu
The preparation of high-performance nanofiltration membranes with high permeability and selectivity is a great challenge. Herein, we proposed 2-Aminophenol-4-sulfonic acid (APS) and piperazine (PIP) co-deposition for the first time through the interfacial polymerization (IP) with trimesoyl chloride (TMC) to form a polyamide (PA) layer. APS-incorporated membrane had a thinner active layer (20–60 nm), larger pore size and smoother membrane surface as well as strengthened electronegative feature. The pure water permeability of the membranes reached 5.8 times that of the control membrane, up to 70.8 LMH/bar with 96.4% rejection for RB, 99.0% rejection for BSA and SA , respectively. More importantly, the optimal membrane showed pure water flux of 22.9 LMH/bar as well as 95.9% Na 2 SO 4 rejection. The retention performance of the membrane also exhibited high dye rejections towards MB, NR, MO above 93.6%, especially 98.0%, 98.3% and 99.1% for CV, CR and RB, respectively. Almost complete removal was achieved for natural organic matters (≥99.7%) in the meanwhile. Significantly, long-term performance stability of the APS-integrated membrane was demonstrated during the 120-h continuous filtration of dye, NOM, and salt solution, respectively. This work provides a loose nanofiltration membrane with regulatable structural morphology for water desalination, surface water and wastewater treatment .
研究领域:
材料科学
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环境工程
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Hanxue Li,Haoliang Huang,Xianguang Yan,Chuanxiang Liu,Liang Li
Dyes are indispensable in the textile industry and are very difficult to degrade due to the presence of two or more benzene rings in their structures. However, the purification of water resources is currently an urgent issue. In this study, a trichlorotriazine-derived calix[4]arene and 1,3,5-tris(4-aminophenyl) benzene were crosslinked to generate a calix[4]arene crosslinked polymer that can serve as a highly efficient adsorbent for separating cationic dyes from water. This research provides evidence for the efficiency of the polymer to adsorb various organic micropollutants in water via batch adsorption experiments. In particular, this polymer exhibited a removal efficiency over 99.6% and 99.4% for methylene blue and toluidine blue within 5 min, respectively. The kinetic results showed that the adsorption process of this polymer for organic dyes could be described with quasi-second-order models, and Langmuir isotherm adsorption models demonstrated that the maximum equilibrium adsorption capacity for methylene blue and toluidine blue was reached to 1806.82 and 2161.32 mg g −1 , respectively. These observations suggest that the adsorption is mainly dependent on the electrostatic interactions, π−π interactions, and hydrogen bonding between the polymer and the organic dyes. Furthermore, the adsorption capacities of the adsorbent were maintained at high levels after five cycles. Its excellent adsorption capability and recyclability make this polymer a promising candidate for potential applications in water purification.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 97
·79456-79462
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IF 3.84
Zhuo Ma,Yunfeng Qiu,Yanmin Huang,Feng Gao,PingAn Hu
We report the eco-friendly chitosan assisted synthesis of 3D graphene@chitosan@Au nanosheet (3DG@CS@AuNSs) composites without using any toxic reductants or capping agents. The 3D graphene network consists of few-layer graphene sheets. One the one hand, the interfacial energy between graphene and Au nanostructures is significantly weakened due to the existence of chitosan polymers, serving as “glue” for anchoring Au nanosheets on the surface of 3D graphene. On the other hand, chitosan contains abundant hydroxyl and amine groups acting as reducing and stabilizing agents for the formation and even distribution of Au nanosheets. Mild redox reaction between hydrochloroauric ions and hydroxyl and amine groups occurred under thermal conditions due to the matching electrochemical potentials of the oxidants and reductants. The as-prepared 3DG@AuNSs exhibited much higher activities than that of 3DG@Au nanoaggregates towards the reduction of 4-nitrophenol, as well as more convenient recyclability than other supported Au NPs in terms of a robust free-standing foam structure. Furthermore, high performance liquid chromatography was also applied to monitor the emergence of 4-aminophenol during reaction. The present studies not only build a new route for the design of a robust and free-standing foam catalyst based on the integration of graphene and Au nanostructures by the assistance of a natural polymer, but also shed deep insight on the understanding of the synergistic catalytic activity towards nitrophenols.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
Molecular Catalysis
·
2023
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IF 4.6
Xuewu Ji,Guirong Bao,Peng Gao,Jia Luo,Dequan Chen,Zhen Fang
Vanillin hydrodeoxygenation (HDO) was studied in water and methanol using palladium-decorated carbon dots (Pd/CDs). The catalyst was synthesized from photo-reduction of palladium acetate using CDs as the reducing and dispersion agent, while CDs were produced via microwave treatment of glucose and urea. Pd/CDs were characterized with XRD, TEM, FT-IR, XPS, BET and ICP-OES. The selectivity to 2‑methoxy-4-methylphenol (MMP), at vanillin conversion of 100 % after 4.0 h was 98.8 % at 140 °C under 4.0 MPa of H 2 in water with 4.58 wt.% of Pd/CDs. The stability of Pd/CDs was also investigated after four times recycle under the optimal reaction conditions. CDs supported Pd reduced with NaBH 4 and hydrazine hydrate (Pd/CDs-S and Pd/CDs-H) and other carbonaceous materials (active carbon and OH functionalized multi-walled carbon nanotube) supported Pd (Pd/AC and Pd/CNTs) were also investigated for comparison. The highest selectivity to MMP achieved by Pd/CDs produced via photoreduction brings a novel use of this type of catalyst in the conversion of biomass into value-added chemicals and materials.
研究领域:
化学工程
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催化材料
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 18
·7028-7034
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IF 3.069
Weitao Xu,Ming Liu,Mary Clare Escaño,Carl Redshaw,Bing Bian,Ying Fan,Zhu Tao,Xin Xiao
The interaction between cucuribit[10]uril (Q[10]) and a series of 4-pyrrolidinopyridinium salts bearing aliphatic substituents at the pyridinium nitrogen, namely 4-(C4H8N)C5H5NRBr, where R = Et (g1), n-butyl (g2), n-pentyl (g3), n-hexyl (g4), n-octyl (g5), n-dodecyl (g6), has been studied in aqueous solution by 1H NMR spectroscopy, electronic absorption spectroscopy and mass spectrometry. The results revealed that the guests g1–g5 are located completely inside the cavity differing only in the orientation of g1, g4 and g5 which are aligned with the portal, whilst g2 and g3 are perpendicular to it. For g6, the tetrahydropyrrole moiety remains outside of the portal. DFT calculations confirm the stability of the guests in the Q[10] and the possibility of their curved structure inside the Q[10].
研究领域:
化学
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分子生物学
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DOI
高影响因子
Reaction Chemistry & Engineering
·
2021
·Vol. 6
·期 12
·2259-2265
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IF 4.239
Zhou Lan,Yangcheng Lu
A strategy of dissolving chlorine gas in 1,2-dichloroethane as the chlorine source for a liquid–liquid two-phase chlorination reaction was proposed in this study to resolve the problems of low efficiency, strong corrosivity, and poor controllability of traditional gas–liquid chlorination. Taking the chlorination reaction of 4-nitroaniline to synthesize 2,6-dichloro-4-nitroaniline as an example, the feasibility of the liquid–liquid chlorination method was verified in a microflow system. It can achieve 98.3% conversion and 90.6% selectivity within 1.6 s under the optimized reaction conditions. The recycling of HCl and 1,2-dichloroethane solvents was facile, and after three runs of recycling the chlorination reaction can still maintain good conversion and selectivity. The influence of feed mixing and the reaction networks on chlorination of 4-nitroaniline were also explored as a guide for process design. Compared with the traditional gas–liquid chlorination, the reaction efficiency of liquid–liquid two-phase chlorination is greatly improved, and it has a prospect for industrial application in terms of safety and controllability.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
Frontiers in Microbiology
·
2018
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IF 4.019
Zhang Hui,Yu Ting,Wang Yiran,Li Jie,Wang Guangli,Ma Yingqun,Liu Yu
4-Chlorophenol (4-CP) oxidation plays an essential role in the detoxification of 4-CP. However, oxidative regulation of 4-CP at the genetic and biochemical levels has not yet been studied. To explore the regulation mechanism of 4-CP oxidation, a novel gene cluster, cphRA2A1, involved in biodegradation of 4-CP was identified and cloned from Rhodococcus sp. strain YH-5B by genome walking. The sequence analysis showed that the cphRA2A1 gene cluster encoded an AraC-type transcriptional regulator and a two-component monooxygenase enzyme, while quantitative real-time PCR analysis further revealed that cphR was constitutively expressed and positively regulated the transcription of cphA2A1 genes in response to 4-CP or phenol, as evidenced by gene knockout and complementation experiments. Through the transcriptional fusion of the mutated cphA2A1 promoter with the lacZ gene, it was found that the CphR regulator binding sites had two 15-bp imperfect direct repeats (TGCA-N6-GGNTA) at −35 to −69 upstream of the cphA2A1 transcriptional start site. Notably, the sub-motifs at the −46 to −49 positions played a critical role in the appropriate interaction with the CphR dimer. In addition, it was confirmed that the monooxygenase subunits CphA1 and CphA2, which were purified by His-tag affinity chromatography, were able to catalyze the conversion of 4-CP to 4-chlorocatechol, suggesting that strain YH-5B could degrade 4-CP via the 4-chlorocatechol pathway. This study enhances our understanding of the genetic and biochemical diversity in the transcriptional regulation of 4-CP oxidation in Gram-positive bacteria.
研究领域:
微生物学
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环境生物技术
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遗传学
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生物化学
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DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2013
·Vol. 41
·期 5
·3243-3260
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IF 0.88
Fa HuanBao,Zhou JingTing,Zhang Dong,Yin Wei,Zhang HaiFeng,Huo DanQun,Hou ChangJun,Luo XiaoGang,Mao YaLi,Zhang Jin
A novel 4-(2-{[6-(1,1-dicyanoprop-1-en-2-yl)naphthalen-2-yl](methyl)amino} ethoxy)-4-oxobutanoic acid ( 5 ) fluorescent probe for β-amyloids was synthesized by catalytic acylation using 4-dimethylaminopyridine between succinic anhydride and (1-{6-[(2-hydroxyethyl)(methyl) amino]-2-naphthyl}ethylidene)malononitrile ( 4 ). The structures of all compounds were identified by proton nuclear magnetic resonance spectroscopy, infrared spectroscopy, mass spectrometry, and ultraviolet–visible (UV–Vis) spectroscopy. The UV–Vis and fluorescence spectra of 1-{6-[(2-hydroxyethyl)(methyl) amino]-2-naphthyl}ethan-1-one ( 3 ), 4 , and 5 in solvents with different polarities were investigated, and the effects of solvent polarity on the optical properties of the three compounds were studied. The objective product 5 showed high binding affinities toward Aβ(1–40) aggregates in vitro ( K
d = 29.4 nmol/L) by fluorophotometry. This study provides a powerful fluorescent probe for the molecular diagnosis of Alzheimer’s disease.
研究领域:
化学
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生物化学
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神经科学
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分子生物学
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药学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Fan Fan,Jiao He,Junyu Chen,Xinjian Cheng
4-Nitrophenol (4-NP) poses a threat to the environment and human health. Developing a method to efficiently detect and separate 4-NP is of great significance. In this work, boron-dipyrromethane (BODIPY) phosphor was first prepared. Then, a small molecule fluorescent probe (BD-Ac) with an acetylene group was prepared through a Schiff base formation reaction. At the same time, the reversible addition-fragmentation chain transfer (RAFT) reagents (CTA-1, CTA-2) were prepared and polymerized with ethyl 2- (hydroxymethyl) acrylate and tert-butyl vinylcarbamate to obtain three non-fluorescent macromolecules P-01, P-02, and P-03 containing amino groups (−NH 2 ). The three polymers P-01, P-02, and P-03 were combined with the small molecule fluorescent probe (BD-Ac) through the alkyne-amine click reaction to obtain three fluorescent macromolecules P-1, P-2, and P-3. Meanwhile, through gel permeation chromatography (GPC) testing, it was confirmed that they have a good narrow distribution, with PDI values reaching 1.08, 1.05, and 1.06 respectively. Due to the existence of excited-state proton transfer (ESPT), 4-NP can quench the fluorescence of three fluorescent macromolecules. Limit of detection (LOD) reached 2.8 × 10 −7 mol/L, 3.4 × 10 −7 mol/L, and 4.8 × 10 −7 mol/L respectively. Not only can it identify 4-NP, but it can also achieve efficient separation of 4-NP. The separation efficiencies are 67.9 %, 68.9 %, and 60.3 % respectively. The as-prepared polymeric fluorescence probes might find application in the analytical and environmental sciences.
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高影响因子
WATER ENVIRONMENT RESEARCH
·
2024
·Vol. 96
·期 2
·e10984
·
IF 2.5
Xinchao Ruan,Huan Wang,Fengyun Huang,Fanye Wang,Xiaojun Yang
In this study, a highly efficient peroxymonosulfate (PMS) activator, ZnO/ZnMn 2 O 4 , was synthesized using a simple one-step hydrothermal method. The resulting bimetallic oxide catalyst demonstrated a homogenous and high-purity composition, showcasing synergistic catalytic activity in activating PMS for degrading 2, 4-dichlorophenol (2, 4-DCP) in aqueous solution. This catalytic performance surpassed that of individual ZnO, Mn 2 O 3 , and ZnMn 2 O 4 metal materials. Under the optimized conditions, the removal efficiency of 2, 4-DCP reached approximately 86% within 60 min, and the catalytic ability remained almost constant even after four cycles of recycling. The developed degradation system proved effective in degrading other azo-dye pollutants. Certain inorganic anions such as HPO 4 − , HCO 3 − , and NO 3 − significantly inhibited the degradation of 2, 4-DCP, while Cl − and SO 4 2− did not exhibit such interference. Results from electrochemical experiments indicated that the electron transfer ability of ZnO/ZnMn 2 O 4 surpassed that of individual metals, and electron transfer occurred between ZnO/ZnMn 2 O 4 and the oxidant. The primary active radicals responsible for degrading 2, 4-DCP were identified as SO 4 •− , OH • and O 2 •− , generated through the oxidation and reduction of PMS catalyzed by Zn (II) and Mn (III). Furthermore, X-ray photoelectron spectroscopy (XPS) analysis of the fresh and used catalysts revealed that the exceptional electron transfer ability of ZnO facilitated the valence transfer of Mn (III) and the transfer of electrons to the catalyst's oxygen surface, thus enhancing the catalytic efficiency. The analysis of radicals and intermediates indicates that the two main pathways for degrading 2, 4-DCP involve hydroxylation and radical attack on its aromatic ring. Practitioner Points A bimetallic ZnO/ZnMn 2 O 4 catalyst was synthesized and characterized. ZnO/ZnMn 2 O 4 can synergistically activate PMS to degrade 2, 4-DCP compared with single metal oxide. Three primary active radicals, O 2 •− , • OH, and SO 4 •− , were generated to promote the degradation. ZnO promoted electron transfer among the three species of Mn to facilitate oxidizing pollutants. Hydroxylation and radical attack on the aromatic ring of 2, 4-DCP are the two degradation pathways.
研究领域:
环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Kuang Yi,Xia Yunlong,Wang Xing,Rao Qingqing,Yang Shengxiang
4-hydroxyl coumarin (HC), an important intermediate during the synthesis procedure of rodenticide and anti-cardiovascular drug, shows highly medicinal value and economic value. To achieve the efficient adsorption of HC from natural biological samples, a novel magnetic surface molecularly imprinted polymer (HC/SMIPs) was constructed by employing methacrylic acid (MAA) as functional monomer, organic silane modified magnetic particles as matrix carrier and HC as template molecule. Due to the numerous specific imprinted cavities on the HC/SMIPs, the maximum adsorption capacity of HC/SMIPs for 4-hydroxycoumarin could reach to 22.78 mg g−1 within 20 min. In addition, HC/SMIPs exhibited highly selective adsorption for 4-hydroxycoumarin compared with other active drug molecules (osthole and rutin) and showed excellent regeneration performance. After 8 cycles of adsorption-desorption tests, the adsorption capacity of HC/SMIPs just slightly decreased by 6.64%. The efficient selective removal and easy recycle of 4-hydroxycoumarin from biological samples by HC/SMIPs made a highly promising to advance the application of imprinting polymers in complex practical environments.
研究领域:
分析化学
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材料科学
·
药物化学
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产品关联
DOI
PubMed
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2021
·
IF 4.237
Zhou Lan,Yangcheng Lu
In this work, a tubular reactor with a micromixer was introduced in attempt to enhance the amination reaction of 4-nitrochlorobenzene in terms of the process efficiency and safety. It was found that the reaction system containing a large excess of ammonia water can become homogeneous at high temperature. Thus, as both micromixing and the heat transfer performance were guaranteed, the set-up combining a micromixer and a microtube reactor enabled the reaction to exhibit homogeneous reaction characteristics, meeting the demands of efficiency and reliability. Furthermore, using a multi-channel sampling system connected behind the micromixer, the reaction kinetics were studied in a modified “stop flow” mode, which is adaptable for in-situ fast homogenization, high temperature, and high pressure. The reaction conditions were screened and a kinetic model was developed. Accordingly, we propose and verify a self-circulation strategy to reduce the burden of ammonia separation and recovery in a continuous tubular reactor system.
研究领域:
化学工程
·
反应工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）