JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 12
·8269-8275
·
IF 1.354
Wang Manchao,Peng Lin,Wang Jiahui,Li Changqing,Guan Lihao,Lin Yuqing
In this study, hierarchical ternary nanocomposites, i.e., Cu–TiO2-mesoporous silica microspheres (Cu–TiO2-MSM), were synthesized as ternary photocatalyst system to improve the visible light photocatalytic degradation of the environmental pollutant model
dye methylene blue (MB). The innovation of this method is in situ depositing TiO2 and Cu2O nanoparticles sequentially onto the surface of mesoporous silica microspheres to form highly active heterostructure. The improved activity for the degradation of MB is attributed
to: (1) the high adsorption capacity of the porous and interconnected-channel-structure MSM to MB; (2) the valence band electrons of TiO2 released from the conduction band generating abundant highly active free radicals, which directly reacted with adsorbed MB. The photocatalytic
degradation efficiency to MB was found to be 98% in 5 min, and almost 100% in 20 min. This study paves a way for the development of a ternary-doped catalyst for visible light photocatalytic degradation and may exhibit widely application in industry.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
·
IF 3.909
Yashi Chen,Yuwei Long,Qing Li,Xinhong Chen,Xi Xu
In this work, a biobased adsorbent (CMC-PAMA) consisting of sodium carboxymethyl cellulose, polyacrylic acid and polyacrylamide was prepared by a simple thermal crosslinking method for the removal of methylene blue (MB) and Pb (II) from aqueous solutions. The CMC-PAMA showed excellent static adsorption capacities for MB and Pb (II) of 1611.44 mg·g −1 840.11 mg·g −1 , respectively, indicating its excellent performance on dyes dynamic removal. The adsorption performance of the as-prepared CMC-PAMA could be fitted well with pseudo-second-order and Langmuir isothermal model. The adsorption mechanism between CMC-PAMA and Pb (II) was confirmed by FT-IR, XPS and ion-exchange behavior. Interestingly, CMC-PAMA showed high efficiency for separation of MB/methyl orange (MO) mixtures, low equilibrium swelling ratio (0.52 g·g −1 ) in distilled water, good stability and reusability. With those combined advantages, CMC-PAMA could find potential application in wastewater treatment.
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Nanoscale
·
2013
·Vol. 5
·期 7
·3078-3082
·
IF 6.233
Jinhui Hao,Wenshu Yang,Zhe Zhang,Shunhao Pan,Baoping Lu,Xi Ke,Bailin Zhang,Jilin Tang
A facile method is proposed for the synthesis of three-dimensional (3D) flower-like Co3−xFexO4 ferrite (CF) hollow spheres, using SiO2@FeOOH as precursor. The CF hollow spheres are efficient for the catalytic degradation of methylene blue (MB) in the presence of H2O2 at 80 °C. The obtained CF hollow spheres were characterized using transmission electron microscopy, field emission scanning electron microscopy, X-ray diffraction, X-ray photo-electron spectroscopy, and N2 adsorption–desorption isotherm measurements. The formation of 3D hierarchical flower-like superstructure was influenced by the relative amount of urea used. As the mole ratio of CoCl2 and urea decreased, the structure of the products was tailored from yolk-like spheres to hollow spheres with different sized void interiors. Moreover, N2 adsorption–desorption isotherm analysis showed that the CF hollow spheres have a large specific surface area (163 m2 g−1) which provided more activity sites. The CF hollow spheres can catalyze the oxidation of MB efficiently. These results indicate that the designed CF hollow spheres exhibit promising capability for the degradation of dyes.
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INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
·
2013
·
IF 2.142
Qing Yang,Yongjun Hu,Yanchun Wei,Honglei Wang,Jiwen Guan,Yanjiao Zhang,Shaoxin Li
Laser desorption postionization mass spectrometry (LDPI-MS) is a novel mass spectrometry. In present report, LDPI-MS method with 10.5 eV vacuum ultraviolet (VUV 118 nm) single photon ionization (VUV-SPI-MS) is firstly used to detect medicinal chemicals (taking the methylene blue (MB) as the example) in situ in intact tissues, where MB is dosed into the tissue in advance. The neutral species of tissue and dosed MB are vaporized under 1064 nm IR radiation firstly, and followed by VUV (118 nm) light for postionization. The optimal delay time between the desorption laser and ionization laser is between 18 and 35 μs. The results show that a variety of the fragments of amino acids and other biological species below m / z 100 can be detected in the tissue which do not interfere the signal of MB detected in the MB-dosed tissue. The method, termed laser desorption postionization mass spectrometry with 10.5 eV vacuum ultraviolet (VUV 118 nm) single photon ionization, promises to be an approach toward in situ detection of medicinal chemicals in intact tissues.
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JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 18
·6113-6123
·
IF 2.371
Liu Xiaoyan,Zhou Yifeng,Nie Wangyan,Song Linyong,Chen Pengpeng
Novel environmental friendly hydroxypropyl cellulose (HPC) hydrogels were fabricated upon compositing with graphene oxide (GO) in this work. In order to promote a more homogeneous dispersion of GO sheets in HPC, GO was firstly modified with HPC chains through esterification. The morphology and chemical structure of the functionalized HPC-GO were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometer, X-ray diffraction, and thermo-gravimetric analysis. Then scanning electronic microscope was employed to compare the morphologies of the HPC and HPC-GO/HPC hydrogels. The obtained HPC-GO/HPC hydrogels exhibited excellent adsorption performance toward methylene blue. Simulation of the practical use by preparing simple adsorption columns made from in situ formation of HPC-based hydrogels had given a visible observation of the significant adsorption effect brought by the incorporation of HPC-GO sheets. Adsorption kinetics were then imitated by Lagergren pseudo-first-order and pseudo-second-order models. Adsorption isotherms were imitated by Langmuir isotherm and Freundlich isotherm.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Guozhong Zhang,Shuqu Zhang,Longlu Wang,Ran Liu,Yunxiong Zeng,Xinnian Xia,Yutang Liu,Shenglian Luo
The scrupulous design of hierarchical structure and highly active crystal facets exposure is essential for the creation of photocatalytic system. However, it is still a big challenge for scrupulous design of TiO 2 architectures. In this paper, bird’s nest-like anatase TiO 2 microstructure with exposed highly active (001) surface has been successfully synthesized by a facile one-step solvothermal method. Methylene blue (MB) is chosen as a model pollutant to evaluate photocatalytic activity of as-obtained TiO 2 samples. The results show that the photocatalytic activity of the bird’s nest-like sample is more excellent than P25 in the degradation of MB due to high specific surface area and highly active (001) crystal facets exposure when tested under simulated solar light. Besides, it can be readily separated from the photocatalytic system by sedimentation after photocatalytic reaction, which is a significant advantage against conventional powder photocatalyst. The bird’s nest-like microspheres with novel structure may have potential application in photocatalysis and other fields.
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MATERIALS & DESIGN
·
2017
·
IF 4.364
Guoqiang Zhao,Weiping Li,Jianbo Feng,Guanwu Jiang,Xi Wang,Huicong Liu
Photopolymer film has been widely used in optical devices. However, the low initiator efficiency limits its wider development. In this study, Methylene blue (MB)/ N -methyldiethanolamine (MDEA) and MB/1,4-diazabicyclo [2.2.2]octane (DABCO) were first adopted as initiator system in photopolymer film and compared their initiator system efficiencies with the common initiator system MB/triethanolamine (TEA) by a self-established single-beam exposure setup. The MB/MDEA showed the highest performance, while the MB/DABCO was the poorest. The quantum yield , bleaching rate and saturated exposure of the MB/MDEA were 3.31 times, 2.62 times and 2.49 times, respectively, higher than those of the MB/TEA. This order of initiator system efficiencies (MB/MDEA > MB/TEA > MB/DABCO) is exactly consistent with the order of proton transfer efficiencies of the electron donors (MDEA > TEA > DABCO). Furthermore, high proton transfer efficiency and excellent migration of electron donors are helpful to improve initiator system efficiency via surface micromorphology analysis.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Zhaohui Yang,Min Li,Mingda Yu,Jing Huang,Haiyin Xu,Yan Zhou,Peipei Song,Rui Xu
A novel approach was proposed for the removal of methylene blue (MB), a soluble cationic dye, from aqueous solution by calcium dodecyl sulfate (Ca(DS) 2 ) enhanced precipitation which was based on the solubilization of sodium dodecyl sulfate (SDS) on MB and Ca 2+ effect on SDS micelles, and microbial flocculant GA1 (MBFGA1) flocculation. The independent and interactive effects of factors, such as SDS, Ca 2+ and MBFGA1 dosages, on the MB removal and interaction between SDS and Ca 2+ were investigated. The response surface methodology (RSM), environmental scanning electron microscope (ESEM) and energy dispersive spectrometer (EDS) analysis were employed to discuss the interaction mechanism between SDS and Ca 2+ , and MB removal mechanism. The results showed that MB and SDS removal efficiency could reach 98.63% and 88.97%, respectively, with pH (10), MB (50 mg/L), SDS (8 mM), Ca 2+ (5 mM) and MBFGA1 (4 mL/L). Under the optimal conditions, residual SDS and Ca 2+ concentrations in the upper phase were 0.88 mM and 1.27 mM, respectively, which reached the K sp of Ca(DS) 2 . The concentration consumption ratio between SDS and Ca 2+ was 2.0. The interaction between SDS and Ca 2+ was depended on the SDS-Ca 2+ concentration ratio in aqueous solution rather than the CMC of SDS. When Ca 2+ concentration was relatively sufficient, SDS micelles containing the solubilized MB (SDS-MB micelles) would disassemble to generate MB loaded Ca(DS) 2 particles (CDS-MB particles) which would be flocculated by MBFGA1. Whereas, when SDS concentration was superfluous relatively, SDS micelles formed in the upper phase would redissolve the CDS-MB particles in flocs.
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Nanoscale
·
2025
·
IF 5.1
Xianliang Ren,Liang Fang,Yi Hu,Fang Wu,Gaobin Liu,Shufang Zhang,Haijun Luo
MXenes are widely recognized as excellent dye adsorption materials. However, their propensity to oxidize will greatly reduce their stability and performance. In the present work, a simple antioxidation treatment was applied to TiVCTx using three acid antioxidants (oxalic acid (OA), sodium citrate (SC), and tartaric acid (TA)) and their effects on the stability and methylene blue adsorption performance were investigated. The stability of TiVCTx stored in an aqueous solution within 14 days was assessed using XRD and XPS. The antioxidant-treated TiVCTx showed a significant improvement in both long-term stability and MB adsorption properties, with TA-TiVCTx demonstrating the best performance. The MB adsorption of the as-prepared TiVCTx was physical and multilayer, but it became a multilayer process where physical and chemical adsorptions coexist after antioxidation treatment. The maximum adsorption capacity of TA-TiVCTx reached 8061.03 mg g−1 and remained at 3887.28 mg g−1 after 14 days of storage, far exceeding the performance of other reported adsorbents. It is found that the enhanced stability is attributed to the dense protective layer formed by the chelation between the antioxidant and TiVCTx, and the improved MB adsorption performance is ascribed to the synergistic effect of electrostatic adsorption between TiVCTx and MB and the Bloch reaction between the antioxidants and the MB molecules. The differences in the enhancement effects of the various antioxidants are related to the number of carboxyl and hydroxyl groups in the antioxidant molecules. This work provides useful reference and guidance for obtaining MXenes with better stability and adsorption performance.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Yaqi Xiao,Zhi Cai,Ying Yi,Yihua Yin,Weiquan Cai,Guanghua He,Jingli Zhang,Wenjin Xu,Yaru Li
Cationic photosensitizers have higher photodynamic antibacterial activity compared with anionic photosensitizers, and with low toxicity and no drug resistance. However, their poor photostability and low utilization rate limit their practical applications. Herein, a new strategy for the construction of a GSH-responsive antibacterial nanogel system is developed via the electrostatic interaction between methylene blue (MB) and sulfonated sodium alginate (HSSA) to self-assemble into nanoparticles followed by sulfhydryl cross-linking in an aqueous solution. The photobleaching of MB can be inhibited due to the self-aggregation-caused quenching (ACQ) effect, but the photodynamic activity can be restored by breaking the disulfide-crosslinking bonds in the nanogel in response to 10 mM GSH. In vitro antibacterial tests prove that the system has antibacterial activity beyond anionic photosensitizers. Antibacterial studies on plants show that the system has targeted antibacterial activity on infected plants and good wettability, retention, and adhesion to plant leaves. Safety evaluation shows that the system has no obvious toxic effect on plants. Therefore, this study provides a new approach to the discovery of novel photodynamic bactericides.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Wenjing Zhang,Yin Zeng,Fengying Cai,Hongliang Wei,Yuxuan Wu,Hui Yu
Hydrogels based on biopolymers have attracted considerable interest in the last decades. Herein, an interpenetrating network hydrogel (IPN-Gel) adsorbent from starch-chitosan was fabricated facilely in one-pot through tandem Schiff base reaction and photopolymerization. First, aldehyde starch (DAS) was synthesized by the reaction of soluble starch with sodium periodate. Afterward, acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), polyethylene glycol dimethacrylate (PEGDMA), photoinitiator, chitosan and DAS were dissolved in water to obtain a clear solution. Schiff base reaction between chitosan and DAS took place quickly to form the first network, and then photopolymerization of AM, AMPS, and PEGDMA occurred under ultraviolet radiation to form the second network. The preparation conditions of the as-prepared IPN-Gel were optimized with two indexes of gel mass fraction and swelling ratio. Its swelling behavior with pH and temperature change was explored. Finally, its adsorption performance was characterized with methylene blue (MB) as a model contaminant. The maximum adsorption capacity of IPN-Gel can reach 2039 mg·g −1 at pH =10. Its adsorption performance accords with Langmuir isothermal model and pseudo-second-order kinetic model and it was mainly controlled by chemisorption. This strategy is expected to found broad application prospects in the preparation of hydrogel adsorbents.
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Catalysts
·
2025
·Vol. 15
·期 1
·69
·
IF 4
Yuning Liang,Baohui Wang,Tao Cheng,Mingchun Bi,Weimeng Chi,Yuxi Liu,Wenjing Zhang,Yuxuan Liu
A novel dual Z-scheme heterojunction photocatalyst was constructed by introducing the narrow-bandgap semiconductor CuInS2(CIS) into the dual metal-organic framework (MOF) system of UiO-66(Zr) and NH2-MIL-101(Fe). This structure effectively overcomes the limitations of conventional photocatalysts in terms of light absorption range and the separation efficiency of photogenerated charge carriers. The prepared ternary catalyst, (UiO-66(Zr))-(NH2-MIL-101(Fe))/CuInS2, exhibited excellent photocatalytic performance under visible light irradiation, achieving a hydrogen production rate of 888 μmol g−1h−1and a methylene blue (MB) degradation efficiency of up to 95.03%. The significant enhancement in performance is attributed to the material’s porous structure, extended light absorption range, and optimized electron transfer pathways. Additionally, the construction of the dual Z-scheme heterojunction further promotes the separation and migration of photogenerated charge carriers, suppressing electron–hole recombination. This study demonstrates the great potential of dual Z-scheme heterojunctions in improving photocatalytic efficiency and provides an important theoretical foundation and design strategy for the development of efficient photocatalysts.
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