SEPARATION AND PURIFICATION TECHNOLOGY
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2015
·
IF 3.091
Lixin Xing,Ningning Guo,Yatao Zhang,Haoqin Zhang,Jindun Liu
Silica spheres in nanoscale were prepared via sol–gel method and then sodium 4-styrene sulfonate was grafted onto the surfaces of SiO 2 (PSS-SiO 2 ) by surface-initiated atom transfer radical polymerization (SI-ATRP). Then, a negatively charged loose SiO 2 -PSS/polyethersulfone (PES) nanofiltration membrane with high flux was fabricated via phase inversion method. FT-IR and TEM results showed that SiO 2 nanoparticles were synthesized and modified successfully. GPC results further proved the “living”/controlled behavior of SI-ATRP. The morphology, hydrophilicity of the membranes were investigated by SEM, static water contact angle and water ratio. The results revealed that the surface hydrophilicity and water permeability of hybrid membranes were greatly improved after adding SiO 2 -PSS and thus may enhance fouling resistance to a certain extent. The salt permeation and separation of dye/salt mixture of the hybrid membranes were significantly superior to the pure PES membrane, and the order of permeation for different salt solutions was NaCl > MgCl 2 > MgSO 4 > Na 2 SO 4 . When the content of SiO 2 -PSS was 3.0 wt%, the hybrid membrane showed optimal performance with IEC value of 0.07 mmol/g and pure water flux of 269.5 L m −2 h −1 and the rejections for all types of salts declined to under 11%. The above results indicated that SiO 2 -PSS incorporated into PES matrix played an important role in enhancing the performance of NF membranes, which may possess a significant impact on the application in dye purification and desalination.
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ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Rui Li,Changxian Liu,Ming Ma,Zhengguo Wang,Guoqing Zhan,Buhai Li,Xian Wang,Huaifang Fang,Huijuan Zhang,Chunya Li
1,3-Di(4-amino-1-pyridinium)propane tetrafluoroborate (DAPPT) ionic liquid was successfully synthesized, and was used as a modifier to functionalize graphene nanosheets through covalent binding of amino groups and epoxy groups in an alkaline solution. The as-prepared graphene-DAPPT nanosheets (Gr-DAPPT) were confirmed with transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV/vis and FTIR spectroscopy. A biocompatible platform based on Gr-DAPPT was constructed for the immobilization of hemoglobin (Hb) through a cross-linking step with chitosan and glutaraldehyde. The direct electron transfer and bioelectrocatalytic reaction of Hb immobilized on Gr-DAPPT surface were achieved. A pair of reversible redox peaks of hemoglobin was observed, and bioelectrocatalytic activity toward the reduction of H 2 O 2 was also demonstrated, displaying a potential application for the fabrication of novel biosensors to sense H 2 O 2 . Such results indicated that Gr-DAPPT based interface would be a promising platform for biomacromolecular immobilization and biosensor preparation.
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RSC Advances
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2015
·Vol. 5
·期 107
·88045-88051
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IF 3.84
Xueqing Gao,Guangrui Xu,Yan Zhao,Shuni Li,Feng Shi,Yu Chen
Graphene nanosheet (GNS) supported gold nanoparticle (Au-NP) composites (Au-NP/GNS) have attracted a lot of attention due to their important applications in catalysis, sensing, optics, medicine, and fuel cells. In this study, based on the strong electrostatic and/or hydrogen bonding interactions between the amine-functionalized Au-NP (Au-NP@NH2) and phosphonate-functionalized GNS (GNS-PO3H2), a self-assembly strategy was used to synthesize Au-NP/GNS composites. The physical and chemical properties of Au-NP@NH2, GNS-PO3H2, and the Au-NP/GNS composites were fully investigated using various physical characterization, including X-ray powder diffraction, X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, transmission electron microscopy, and zeta potential analysis. The experimental results demonstrate that the phosphonate-functionalization of GNS was critical for the generation of high-quality Au-NP/GNS composites. The as-prepared Au-NP/GNS composites show improved catalytic activity for the degradation of 4-nitrophenol compared to functionalized Au-NP, which was ascribed to the amine-functionalization of the Au-NP and the introduction of the GNS with high electrical conductivity and large surface area.
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RSC Advances
·
2014
·Vol. 4
·期 21
·11003-11011
·
IF 3.708
Wenjun Liu,Dengrong Sun,Jinlong Fu,Rusheng Yuan,Zhaohui Li
Thiol-functionalized reduced graphene oxide (SRG) was prepared by coupling the carboxyl groups on the pre-carboxyl-functionalized graphene oxide (GO) with cysteamines through amide bonds. The as-prepared SRG can function both as a support and reducing agent for the formation of Au/SRG nanohybrids with evenly distributed Au nanoparticles on RGO. The thiol linkage on the RGO can act as anchor for Au nanoparticles and due to the existence of the strong interaction between them, the agglomeration of Au nanoparticles can be significantly impeded. The step-by-step assembly process of the Au/SRG nanohybrid was monitored and the products obtained were characterized by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray absorption near-edge spectroscopy (XANES), atomic force microscopy (AFM), powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The as-prepared Au/SRG nanohybrid showed superior catalytic performance for the hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). It is expected that the method for the preparation of the Au/SRG nanohybrids can also be applied to the preparations of other RGO-based nanohybrid materials which may find a variety of interesting applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2014
·
IF 4.331
Yanlin Ren,Guangyin Fan,Chenyu Wang
Reduced graphene oxide (RGO) supported rhodium nanoparticles (Rh-NPs/RGO) was synthesized through one-pot polyol co-reduction of graphene oxide (GO) and rhodium chloride. The catalytic property of Rh-NPs/RGO was investigated for the aqueous phase hydrodechlorination (HDC) of 4-chlorophenol (4-CP). A complete conversion of 4-CP into high valued products of cyclohexanone (selectivity: 23.2%) and cyclohexanol (selectivity: 76.8%) was successfully achieved at 303 K and balloon hydrogen pressure in a short reaction time of 50 min when 1.5 g/L of 4-CP was introduced. By comparing with Rh-NPs deposited on the other supports, Rh-NPs/RGO delivered the highest initial rate (111.4 mmol/g Rh min) for 4-CP HDC reaction under the identical conditions. The substantial catalytic activity of Rh-NPs/RGO can be ascribed to the small and uniform particle size of Rh (average particle size was 1.7 ± 0.14 nm) on the surface of the RGO sheets and an electron-deficient state of Rh in the catalyst as a result of the strong interaction between the active sites and the surface function groups of RGO.
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PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2014
·Vol. 117
·期 2
·603-610
·
IF 2.206
Liu Jialin,Li Jingrui,Fan Mengjin,Zhang Junying,Cheng Jue
Aromatic amine curing agent with flexible unit in backbone, 1,4-bis (4-diaminobenzene-1-oxygen) n -butane (DDBE), was synthesized, and the structure was confirmed by FT-IR and 1 H NMR. The curing kinetics of tetraglycidyl methylene dianiline (TGDDM, or AG80) using DDBE and 4,4′-bis-(diaminodiphenyl) methane (DDM) as curing agents, respectively, were comparatively studied by non-isothermal DSC with a model-fitting Málek approach and a model-free advanced isoconversional method of Vyazovkin. The dynamic mechanical properties and thermal stabilities of the cured materials were investigated by DMTA and TG, respectively. The results showed that the activation energy of AG80/DDBE system was slightly higher than that of AG80/DDM system. Šesták-Berggren model can generally simulate well the reaction rates of these two systems. DMTA measurements showed that the storage modulus of cured AG80/DDBE is similar to that of cured AG80/DDM at the temperature below glass transition temperature ( T
g ) and lower than that of cured AG80/DDM at the temperature above glass transition temperature, while T
g of cured AG80/DDBE is lower than that of cured AG80/DDM. TG showed that the thermal stabilities of these two cured systems are similar.
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INORGANICA CHIMICA ACTA
·
2014
·
IF 2.041
Yong-Peng Xu,Jie Qin,Shi-Min Sun,Tong-Tong Liu,Xiao-Lin Zhang,Shao-Song Qian,Hai-Liang Zhu
Three novel complexes, [Ni II (dpp) 2 (L) 2 ] ( 1 ), [Ni II (eda) 2 (L) 2 ] ( 2 ) and [Ni II (deda) 2 (L) 2 ] ( 3 ) (L = 3-pyridinyl-4-amino-5-mercapto-1,2,4-triazole, dpp = 1,3-diaminopropane, eda = ethanediamine, deda = N,N-dimethyl ethylenediamine), were synthesized by reacting 3-pyridinyl-4-amino-5-mercapto-1,2,4-triazole with diamines and nickel(II) salt. The complexes were structurally determined by single-crystal X-ray diffraction. The inhibitory activity was tested in vitro against jack bean urease. Molecular docking was investigated to insert complexes into the crystal structure of jack bean urease at the active site to determine the probable binding mode. The experimental values and docking simulation exhibited that complexes 1 , 2 , 3 had better inhibitory activity than the positive reference acetohydroxamic acid, showing IC 50 values of 48.16, 32.35 and 15.22 μM, respectively. These complexes exhibited inhibitory activities as potent urease inhibitor.
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Molecular Medicine Reports
·
2015
·Vol. 11
·期 6
·4671-4677
·
IF 1.554
Qigen Du,Guang Xin,Hai Niu,Wen Huang
The 4[(Tetrahydro‑2H‑pyran‑2‑yl) oxy] phenol (XG‑d) hydroquinone analog, is found in Vaccinium vitis‑idaea L. Although it is known for its antioxidant properties and high level of safety, its antitumor activity remains to be elucidated. In the present study, the anticancer effect of XG‑d was determined in vitro and in vivo. The cytotoxicity of XG‑d against C26 murine colon carcinoma cells was found to occur in a time‑ and concentration‑dependent manner, whereas little effect was observed in the two normal cell lines (HK‑2 and L02) investigated. Oral administration of XG‑d (100 mg/kg) had effects on the tumor growth of tumor‑bearing mice. Furthermore, marked apoptosis was observed using Hoechst 33258 staining and flow cytometric analysis with annexin V/propidium iodide double staining. XG‑d also downregulated the expression of B‑cell lymphoma 2 (Bcl‑2), increased the expression levels of Bcl‑2‑associated X protein and activated caspase‑9, caspase‑3 and poly(adenosine diphosphate‑ribose) polymerase. The present study demonstrated for the first time, to the best of our knowledge, that XG‑d inhibited cancer cell growth via the induction of apoptosis and was also able to inhibit tumor growth in vivo. These results demonstrated that XG‑d may be used as a potential natural agent for cancer therapy with low toxicity.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Guangping He,Chunlan Xing,Xin Xiao,Ruiping Hu,Xiaoxi Zuo,Junmin Nan
Novel three-dimensional flower-like Bi 12 O 17 Cl 2 /β-Bi 2 O 3 composites are prepared using a facile solvothermal-calcining process and their photocatalytic performances for the degradation of 4- tert -butylphenol (PTBP, a representative alkylphenol) are evaluated under visible light irradiation. The formation of such composites is assumed to involve the reduction of Bi(III) to nano-metallic bismuth via a solvothermal process, followed by the reaction of bismuth with oxygen and bismuth oxide chloride hydroxide during the calcination in air. The XRD, XPS, EDS mapping, HRTEM, UV–vis DRS, and photocurrent measurement results indicate that heterojunctions are formed between Bi 12 O 17 Cl 2 and β-Bi 2 O 3 with broad contact interfaces. The as-synthesized Bi 12 O 17 Cl 2 /β-Bi 2 O 3 hybrid materials possess favorable band structures, heterojunction structures, relatively high specific surface areas, and hierarchical micro/nano-structures, resulting in superior photocatalytic and mineralization efficiencies for the decomposition of PTBP under visible light irradiation. The optimum photocatalytic activity of a Bi 12 O 17 Cl 2 /β-Bi 2 O 3 sample is approximately 3, 12, 51, and 107 times higher than the activities of single β-Bi 2 O 3 , Bi 12 O 17 Cl 2 , nitrogen-doped TiO 2 , and BiOCl, respectively. In addition, the photogenerated reactive species are identified based on free radicals trapping experiments and EPR analysis, which reveals that the photodegradation of PTPB over Bi 12 O 17 Cl 2 /β-Bi 2 O 3 under visible light is dominated by direct hole and superoxide radical oxidation rather than oxidized by hydroxyl radical.
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CHEMICAL ENGINEERING SCIENCE
·
2015
·
IF 2.337
Jun Mei,Jianyong Mao,Zhirong Chen,Shenfeng Yuan,Haoran Li,Hong Yin
The aim of this paper is to explore the reason for the catalyst-free phenomenon of synthesizing 4-hydroxy-2-butanone from formaldehyde and acetone under supercritical conditions and in high-temperature liquid-phase. Experiments were conducted in a tubular flow-type reactor at temperatures between 230 and 270 °C for residence times between 0.5 and 8 min. Under these conditions, a small amount of formic acid appeared via noncatalytic self-disproportionation of formaldehyde. The generated formic acid proved to play a role as catalyst in main reactions. A mechanism-based detailed chemical kinetics model for main reactions was suggested to assess the effect of temperature. This model applied well both under supercritical conditions and in high-temperature liquid-phase. The activation energies for forming and dehydration of 4-hydroxy-2-butanone were 97.5±3.5 kJ/mol and 120.6±5.8 kJ/mol, respectively.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yaran Song,Meili Jian,Lili Qiao,Ziyi Zhao,Yujia Yang,Tifeng Jiao,Qingrui Zhang
This study addresses the long-standing challenges of removing and recovering trace silver (Ag) ions from wastewater while promoting their sustainable catalysis utilization. We innovatively developed a composite material by combining charged sulfonated polystyrene (PS) with a PDA coating. This composite serves a dual purpose: effectively removing and recovering trace Ag+ from wastewater and enabling reused Ag for sustainable applications, particularly in the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The PS–PDA demonstrated exceptional selectivity to trace Ag+ recycling, which is equal to 14 times greater than the commercial ion exchanger. We emphasize the distinct roles of different charged functional groups in Ag+ removal and catalytic reduction performance. The negatively charged SO3H groups exhibited the remarkable ability to rapidly enrich trace Ag ions from wastewater, with a capacity 2–3 times higher than that of positively-N+(CH3)3Cl and netural-CH2Cl-modified composites; this resulted in an impressive 96% conversion of 4-NP to 4-AP within just 25 min. The fixed-bed application further confirmed the effective treatment capacity of approximately 4400 L of water per kilogram of adsorbent, while maintaining an extremely low effluent Ag+ concentration of less than 0.1 mg/L. XPS investigations provided valuable insights into the conversion of Ag+ ions into metallic Ag through the enticement of negatively charged SO3H groups and the in situ reduction facilitated by PDA. This breakthrough not only facilitates the efficient extraction of Ag from wastewater but also paves the way for its environmentally responsible utilization in catalytic reactions.
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Molecular Catalysis
·
2024
·
IF 3.9
Mailidan Wumaer,Rahima Abdulla,Naeem Akram,Zhiqiang Liu,Tingxiang Chen,Jide Wang
Here, four copper oxide/hydroxide composites Cu/CuO, Cu-Cu 2 O/Fe 2 O 3 , Cu-CuO/Co(OH) 2 , and Co(OH) 2 /CuO with CuO(111) or Cu(111) as the central exposed crystal plane were synthesized and used in the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). A study of the dynamic changes of reaction was carried out by real-time HPLC-Q-Orbitrap-HRMS/MS, HPLC, UV–Vis detection, and DFT simulation. It revealed that in copper based catalytic reduction of 4-NP, three different reaction mechanisms are generated over four catalysts. The different adsorption modes and higher adsorption strength of 4-NP on the CuO(111) and Cu(111) plane make it selective and active for both direct hydrogenation and condensation in the reduction of 4-NP. The synergistic effect of different metal crystal faces with CuO(111) can improve the catalytic activity, especially the CuO(111)/Co(OH)(011) crystal planes that have the best synergistic effect on the reduction of 4-NP. This work reports an example where the reaction mechanism was significantly affected by the principal exposed crystal planes of copper oxide/hydroxide composites. It can be very informative for understanding the catalytic processes and providing new ideas for the design of novel catalysts.
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