Inorganic Chemistry Frontiers
·
2017
·Vol. 5
·期 1
·29-38
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IF 4.036
Zhen Zhang,Xiaoling Cui,Wei Yuan,Qihao Yang,Huarong Liu,Hangxun Xu,Hai-Long Jiang
A facile and efficient γ-radiation strategy has been developed to incorporate surface-clean metal nanoparticles (NPs) into UiO-66-NH2 in the absence of stabilizing agents and additional reductants. This approach is enabled by metal ion reduction with active e−aq and H˙ species derived from water radiolysis. As a result, highly dispersed Pd NPs with narrow size distribution were generated and evenly dispersed in UiO-66-NH2. More importantly, the radiation-reduced Pd NPs exhibit significantly enhanced catalytic activity and stability in olefin hydrogenation. Meanwhile, they are also highly active in the catalytic reduction of 4-nitrophenol to 4-aminophenol. Furthermore, the proposed radiation methodology could be successfully extended to prepare other metal NPs such as Au and Pt. Considering that γ-ray radiation is widely used in industry, this study provides a potentially scalable approach to incorporate metallic nanomaterials into metal–organic frameworks with improved catalytic performance.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yi Wang,Jialiang Chen,Lan Wang,Hanqin Weng,Zhihao Wu,Limin Jiao,Yusa Muroya,Shinichi Yamashita,Sheng Cheng,Fuhai Li,Hongbing Chen,Wei Huang,Mingzhang Lin
The large-scale synthesis and the stabilization of noble metal nanocatalysts with ultrasmall sizes are crucial to their practical application. Herein, Pd, Au, and Pt nanoparticles (NPs) are in situ embedded on boron nitride nanosheets (BNNSs) via the reduction of precursor salts induced by 60 Co γ-irradiation, which is a mature technique widely used in industry. The reduction mechanism was elucidated by pulse radiolysis experiments. In comparison with other BN substrates like hexagonal BN ( h -BN), BNNSs had not only large surface area of 263 m 2 g −1 , but also abundant hydroxyl groups produced during the sonicated exfoliation, resulting in ultrasmall sizes, large loading amounts, and uniform distribution of the anchored NPs. The particle sizes of the loaded Pd, Au, and Pt NPs were measured to be 2.9, 3.1, and 3.0 nm, respectively. As a consequence, in the model reaction of 2-nitroaniline reduction, the Pd-, Au- and Pt-BNNSs composite nanocatalysts showed much higher catalytic activities than those composites loading the corresponding NPs on other BN substrates. Particularly, most of the 2-nitroaniline could be reduced within merely 40 s when using Pd-BNNSs as catalysts, performing a rate constant of 1.1 × 10 −1 s −1 . The number of hydroxyl groups on BNNSs support as well as the catalytic performance of the corresponding NPs-loaded BNNSs composites could be improved by extending the sonicated exfoliation time, because more NPs were loaded and the hydroxyl groups were also proved to play an important role in enhancing the catalytic activity. Moreover, Pd-BNNSs catalysts still displayed prominent activity even after five cycles owing to the high stability of BNNSs and their strong affinity for PdNPs. This work not only demonstrates BNNSs as ideal supports to load noble metal NPs for catalysis, but also reveals the feasibility to synthesize and in situ embed ultrasmall noble metal NPs on BNNSs via γ-irradiation.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
Journal of Hazardous Materials Advances
·
2023
·
IF 0
Abdul Haleem,Shengqi Chen,Jianming Pan,He Weidong
γ − radiation is a clean, fast and efficient synthetic route for polymeric materials. it is very powerful tool to generate free radicals during polymerization without any need of initiator and accelerator in both hydrophilic and hydrophobic media. Here in this work, for the first time, we fabricated acrylamide-methyl-propane sulfonic acid based-single and double network hydrophilic cryogels via γ − radiation at low pH. pH highly effects the synthesis of acrylamide-methyl-propane sulfonic acid based cryogels using redox initiation method. Along with pH, the effect of radiation time and radiation dose rate on cryo-polymerization was also studied. Gold hybrid cryogels (single and double network) were fabricated via self-reduction method at ambient conditions. Fourier transform infrared spectroscopy was implemented for chemical structure analysis of the synthesized material. The surface morphology of single and double network cryogels was observed via scanning electron microscopy. For the hybrid cryogels materials analysis x-ray diffraction, thermal gravimetric analysis, energy dispersive x-ray analysis, x-ray photoelectron spectroscopy and transmission electron microscopy and was used to confirm the presence of nanoparticles in the polymer network. The fabricated hybrid cryogels (0.15 g) were used for the degradation of Congo red (50 mL) as model dye in the presence of NaBH 4 (0.02 g) with efficient and fast degradation activity. The apparent rate constant value (K app ) for single and double network hybrid cryogels was 0.3652 min −1 and 0.2268 min −1 , respectively. The activation energy, enthalpy and entropy was calculated (34.44 kJ.mol −1 , –30.85 kJ.mol −1 and –146.30 J·mol −1 k −1 , respectively) using Arrhenius and Eyring equations for the fabricated catalyst. The catalyst was tasted in the tap water system and its efficiency was satisfied in real world too. The fabricated double wall hybrid catalyst will have a significant importance in the environmental field.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
Journal of Water Process Engineering
·
2025
·
IF 6.7
Bo Tian,Wenze Li,Jianwei Zhang,Jinfeng Li,Na Zhou,Wa Gao,Nan Zhang,Hongtao Zhao
With the advancement of nuclear energy, the recovery and reuse of uranium pose extremely challenging tasks. This paper commences by toughening polyacrylamide (PAM) with nanorubber polybutadiene (PB) through the radiation-induced graft polymerization (RIGP) method, and diaminomaleonitrile (DAMN) is introduced and amidoximated, giving rise to a three-dimensional network hydrogel named as bis-amidoxime (AO) -based three-dimensional hydrogel uranium adsorbent based on nano-rubber toughening (PAM/PB/DAMN-AO). This hydrogel not only retains the favorable hydrophilicity and chemical stability of PAM but also experiences a significant enhancement in mechanical properties due to the addition of nanorubber PB. In the tests of 10 cyclic compressions (with a strain of ε = 80 %), the compressive strength remains nearly unchanged, indicating a stable structure. During the amidoximation reaction and uranium-adsorption process, the pore structure of the hydrogel has been modified, evolving into a structure more conducive to uranium adsorption. In a 100 ppm uranium solution, the adsorption capacity reaches 154.4 mg·g −1 . The kinetic and isotherm models are evaluated, and the adsorption process is found to be more consistent with the pseudo-second-order kinetic model ( R 2 = 0.992) and the Langmuir adsorption isotherm model ( R 2 = 0.997). It exhibits high selectivity in the presence of competing ions and can still maintain an adsorption efficiency of over 90 % after 4 adsorption-desorption cycles, demonstrating excellent recyclability. The prepared hydrogel has a high adsorption capacity for uranyl ions and rapid adsorption kinetics, showing potential application prospects in the fields of nuclear wastewater treatment and uranium resource recovery.
研究领域:
材料科学
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环境科学
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核能技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 90
·86829-86835
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IF 3.289
Ling Chang,Shuquan Chang,Wei Han,Wei Chen,Zheng Li,Zheng Zhang,Yaodong Dai,Da Chen
Novel porous permutite/carbon nanobeads/amidated alginic acid nanocomposites were successfully fabricated via a gamma radiation method. The carbon nanobeads are 40–60 nm in diameter. The cross-linked amidated alginic acid is well dispersed on the surface of carbon nanobeads and permutite. The preparation parameters such as reactant ratio, carbonization conditions and radiation dose were optimized. The influences of contact time, pH and initial concentration of the Cs+ solution were investigated. Contact time = 4 h and pH = 9 are ideal conditions for Cs+ removal. The Cs+ removal efficiency and adsorption capacity can reach 98% and 60.1 mg g−1 respectively. They have good stability and adsorption–desorption properties. The adsorption capacity can maintain more than 85% after 4 adsorption–desorption cycles. The preparation strategy and adsorption mechanism were also discussed. Gamma radiation technology exhibits distinguished advantages to improve the dispersion and stability of organic/inorganic hybrid materials. This method can be easily applied to prepare other similar porous hybrid adsorbents.
研究领域:
材料科学
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环境科学
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核化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 4
·48313
·
IF 2.188
Abdul Qadeer Dayo,Li-li Zhang,Jun Wang,Wen-bin Liu,Sadia Kiran,Abdeldjalil Zegaoui,Hamid Abdelhafid Ghouti,Yitagesu Bereket Arse
The bisphthalonitrile (PN) thermosets series (poly(Baph), poly(Bafph), and poly(Bzph)) were prepared and subjected to 100 and 500 kGy γ-ray irradiation dose from cobalt-60 ( 60 Co) as a source. The main objective of this present study was to investigate the effects of gamma irradiation on the chemical structure, thermomechanical, mechanical, and thermal stabilities, which were studied by using a Fourier transform infrared (FTIR), dynamic mechanical analysis, bending test, and thermogravimetric analysis, respectively. The PN resins characteristics bands, namely, nitrile, triazine ring, and phthalocyanine, were not affected on γ-ray irradiation. However, remarkable changes were observed in the chemical structures of benzene, alkyl and CF 3 , which indeed slightly declined the thermal stabilities, thermomechanical and flexural properties. The decrease in properties could be ascribed to the scission of molecular chains and rupture of chemical bonds of PN resin as confirmed by the FTIR. The poly(Bafph) showed a maximum decline in the thermal stabilities and mechanical properties due to the existence of CF 3 in the polymer skeleton, which could not be crosslinked again once scission occurs under radiation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48313.
研究领域:
材料科学
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高分子化学
·
辐射效应研究
✓ 已验证
产品关联
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2017
·Vol. 34
·期 3
·1600430
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IF 4.474
Jie Wang,Jielin Rong,Zhong Fang,Mozhen Wang,Anila Asif,Qichao Wu,Xiao Zhou,Xuewu Ge
Biosafe nanoparticles with strong near-infrared (NIR) light photothermal conversion effect can bring effective hyperthermia as one of the promising approaches in cancer therapy. In this work, a new facile and green preparation method of polypyrrole (PPy) nanoparticles based on 60 Co γ-ray radiation on a simple air-saturated strong acidic aqueous solution of pyrrole (pH ≤ 1) is studied. According to the MCAP-FACSIMILE simulation on the concentrations of the radiolysis products of water at the presence of H + and O 2 , the main strong oxidative radiolysis products · OH and H 2 O 2 rapidly induce the polymerization of pyrrole. The size of the prepared PPy nanoparticles is about several tens of nanometers and can be controlled by the pH, the concentration of the stabilizer poly(vinyl alcohol), and the absorbed dose rate (the amount of energy absorbed per unit mass of the irradiated material within per unit of time). The PPy nanoparticles show rapid and remarkable NIR (808 nm) photothermal conversion efficiency up to 40.1% in water. Furthermore, the in vitro and in vivo experiments confirm that the prepared PPy nanoparticles exhibit enough strong NIR photothermal effect in tumor cells (4T1 and HeLa) and show a promising prospect as the NIR photothermal agent for the future cancer therapy.
研究领域:
材料科学
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生物医学工程
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肿瘤学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 1
·e6290
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IF 3.1
Chunlei Dong,Xuanzhi Mao,Minglei Wang,Maojiang Zhang,Jianbing Chen,Jiangtao Hu,Guozhong Wu
Heat-resistant, highly surface-hardened, and transparent composites of poly(methylmethacrylate) (PMMA) play a significant role in modern devices. However, conventional PMMA-based composites with high nanoparticle loadings often compromise transparency for high surface hardness and heat resistance due to nanoparticle aggregation and poor interfacial compatibility. In this work, we successfully fabricated an exceptional composite (MSiO 2 /PMMA composites) with high transparency, superior heat resistance, and high surface hardness using γ-ray irradiation-induced polymerization of methyl methacrylate (MMA) containing uniformly dispersed SiO 2 that was modified by 3-methacryloxypropyl trimethoxysilane and trimethylchlorosilane. Specific silanes were utilized for polarity regulation to reduce the agglomeration of SiO 2 nanoparticles and improve compatibility with MMA. Compared to pure PMMA, the 40-MSiO 2 /PMMA composite sample exhibited significantly improved thermal stability in terms of the temperature at 10% weight loss ( T 10% ), glass transition temperature ( T g ), and decreased coefficient of thermal expansion (CTE). Furthermore, this composite achieves a very high surface hardness (pencil hardness of 6H versus H for pure PMMA) while maintaining transparency similar to PMMA. These MSiO 2 /PMMA composites open up new avenues to enhance the performance and durability of materials used in various industries such as electronics, optics, automotive, and aerospace.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
RADIATION PHYSICS AND CHEMISTRY
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2023
·
IF 2.9
Yu Wang,Yue Wang,Chen Liu,Xin Yuan,Jing Peng,Jiuqiang Li,Maolin Zhai
Carboxyl groups exhibit great potential in the field of heavy metal decontamination due to their good coordination ability. In this work, acrylic acid was grafted onto covalent organic framework (COF) by using a γ-ray radiation grafting approach. A carboxyl-functionalized adsorbent designated AA-TbDa-COF with high performance for multiple heavy metal removal was obtained. Infrared spectroscopy and thermogravimetric analysis proved the successful carboxyl modification. The porous nanofiber morphology and high accessibility of carboxyl functional groups give the resultant AA-TbDa-COF ultra-fast adsorption kinetics. The capacity for Pb 2+ , Cd 2+ and Cu 2+ decontamination was 127.9, 60.6 and 39.8 mg/g, respectively. The preparation of functional COFs by radiation method is extended to the field of heavy metal treatment, proving the great potential of radiation-prepared materials in environmental governance.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2016
·Vol. 7
·期 21
·3551-3561
·
IF 5.687
Xiaohang Han,Yangguang Hu,Miao Tang,Huagao Fang,Qianghua Wu,Zhigang Wang
In this study a series of long chain branched polycarbonates (LCB-PCs) was prepared from linear PC precursors through gamma radiation with addition of a difunctional monomer, divinyl benzene (DVB) of varying amounts. The topological structures of the linear PCs and LCB-PCs were measured by size-exclusion chromatography coupled with a multiangle light scattering detector (SEC-MALLS) and rheology. SEC-MALLS measurements showed that the topological structures of the PCs were changed with the introduction of LCB structures. Rheological measurements showed that the LCB structures of the LCB-PCs contributed to enhancements of storage modulus, complex viscosity, shear-thinning behavior, and the deviation of phase angle, δ, from the “standard” curve of linear PCs in the δ − |G*| plots (van Gurp–Palmen plot). Modulated differential scanning calorimetry (MDSC) measurements showed that the glass transition temperature, Tg, of LCB-PCs decreases with increasing LCB degree, which is attributed to the combined effects of both increased branching density and free chain ends. LCB structures introduced into PCs did not apparently weaken the tensile properties of the PC materials, whereas the notched Izod impact strength could be obviously improved by the LCB structures. More importantly, the influence of LCB structures on the environmental stress cracking (ESC) behavior of LCB-PCs was explored and the results indicated that the ESC properties of LCB-PCs could be significantly enhanced with the introduction of LCB structures, which makes the application of LCB-PCs as the window view materials for helmets worn by astronauts while in outer space a possibility.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 26
·e52428
·
IF 3.057
Zhen Lu,Huarong Liu,Xiaoling Cui,Yue Li,Zhijun Lv,Weijian Chen
In this study, we report a new facile method to prepare fluorine-free superhydrophobic separation films by deposition of micron-sized hydrophobic polyhigh internal phase emulsion (polyHIPE) microspheres on stainless steel meshes. The so-called polyHIPE microspheres are polymer ones with interconnected porous structures, which are prepared by γ-ray radiation polymerization of (W/O HIPE)/W double emulsions stabilized by a single emulsifier 12-acryloyloxy-9-octadecenoic acid using a one-step emulsification in this work. The oil–water separation results show that our self-made hydrophobic meshes have excellent oil–water separation efficiency (about 99.5%), outstanding permeation flux (no less than 187.5 L/[m 2 ·min] and the maximum value of 1850 L/[m 2 ·min]). The oil flux of common organic solvents, water contact angle and water intrusion pressure of these hydrophobic meshes can be readily tuned by changing the size, amount and composition of polyHIPE microspheres. It is worth noting that the superhydrophobic meshes remain excellent separation efficiency and stability after 10 cycles in corrosive environments. More importantly, these superhydrophobic meshes can also efficiently separate surfactant-stabilized water-in-oil emulsions. The polyHIPE microspheres decorated superhydrophobic meshes that can easily realize large-scale production have potentially practical applications in sewage treatment or separation/purification.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 61
·55878-55883
·
IF 3.289
Jinxing Chen,Feng Chen,Yiyao Wang,Mozhen Wang,Qichao Wu,Xiao Zhou,Xuewu Ge
A sub-micron sized highly-crosslinked poly(ethyleneglycol dimethacrylate) (PEGDMA) microsphere supported nano-Au catalyst (PEGDMA@AuNP) was successfully prepared through a one-step synthesis method at room temperature and ambient pressure, taking advantage of the γ-ray radiation effect on a simple one-pot system, i.e. a methanol–water solution containing EGDMA, 4-VP, and HAuCl4. Electron microscopy, XPS, and XRD analyses proved that AuNPs of several nanometers had been synthesized and loaded simultaneously with the formation of crosslinked PEGDMA microspheres when the adsorbed dose rate and the initial concentration of HAuCl4 were controlled within a narrow range, i.e. 35–80 Gy min−1 and below 1 mmol L−1 of [HAuCl4]. The size of the prepared PEGDMA@AuNP microspheres changed little with the dose rate, but decreased with the initial [HAuCl4], from 900 nm at 0.1 mmol L−1 to 680 nm at 1 mmol L−1. At the same time, the size of AuNPs increases with the initial [HAuCl4], from 8 nm at 0.1 mmol L−1 to 35 nm at 1 mmol L−1. The prepared PEGDMA@AuNP microspheres can be dispersed stably in both water and organic solvent, CH3CN. They exhibit excellent catalytic efficiency not only on the reduction of Fe(CN)63− by NaBH4 in aqueous solution, but also on the cis–trans isomerization of azobenzenes in CH3CN at room temperature. A satisfactory repeatability of the catalytic performance of the prepared PEGDMA@AuNP microspheres was achieved in organic solvents. This work opens a new green simple and economic way to the synthesis of efficient and chemically-stable polymer-supported nano-metal catalysts.
研究领域:
材料科学
·
催化化学
·
纳米技术
✓ 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）