Polymers
·
2024
·Vol. 16
·期 2
·229
·
IF 4.7
Zhenyu Zhang,Guangyao Shen,Rongbo Li,Lei Yuan,Hongfu Feng,Xiuming Chen,Feng Qiu,Guangyin Yuan,Xiaodong Zhuang
Soft materials bearing rigid, lightweight, and vibration-dampening properties offer distinct advantages over traditional wooden and metal-based fillings for spent fuel transport casks, due to their low density, tunable structure, excellent mechanical properties, and ease of processing. In this study, a novel type of rigid polyurethane foam is prepared using a conventional polycondensation reaction between isocyanate and hydroxy groups. Moreover, the density and size of the pores in these foams are precisely controlled through simultaneous gas generation. The as-prepared polyurethane exhibits high thermal stability exceeding 185 °C. Lifetime predictions based on thermal testing indicate that these polyurethane foams could last up to over 60 years, which is double the lifetime of conventional materials of about 30 years. Due to their occlusive structure, the mechanical properties of these polymeric materials meet the design standards for spent fuel transport casks, with maximum compression and tensile stresses of 6.89 and 1.37 MPa, respectively, at a testing temperature of −40 °C. In addition, these polymers exhibit effective flame retardancy; combustion ceased within 2 s after removal of the ignition source. All in all, this study provides a simple strategy for preparing rigid polymeric foams, presenting them as promising prospects for application in spent fuel transport casks.Keywords:polyurethane foam;fillings;long service life;spent fuel;flame retardance
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 96
·54115-54121
·
IF 3.708
Peng Li,Chunya Wang,Zheng Li,Yichen Zong,Yingying Zhang,Xudong Yang,Shuiqing Li,Fei Wei
Hierarchical and gradient nanostructures are important to exploit the full potential of nanofibers in filtration applications. The introduction of a gradient into carbon nanotube (CNT)/fiber hierarchical structures could result in a change of the particle capturing properties. Here, we show the fabrication of hierarchical carbon nanotube (CNT)/quartz-fiber (QF) filters with gradient nanostructures where the content of CNTs decreases exponentially along the thickness direction of the filters. The loading of catalysts for the growth of CNTs in the QF filter has been achieved using an aerosol technique, which can be carried out on a large-scale. With only 1.17 wt% CNT, the penetration of the CNT/QF filter at the most penetrating particle size (MPPS) has been reduced by one order of magnitude, while the pressure drop only increases about 6% with respect to that of the pristine QF filter, leading to an obvious higher quality factor (Qf) for the CNT/QF filter. More importantly, the service life of the CNT/QF filter with the CNT-rich side downstream has increased by 64% when compared with the pristine QF filter. In contrast, when the CNT-rich side is placed upstream, the service life of CNT/QF filter is only 41.7% of that observed when placing the CNT-rich side downstream. Scanning electron microscopy (SEM) images reveal that the gradient nanostructure of the CNT/QF filter, together with the CNT/QF hierarchical structure play very important roles in the simultaneous enhancement of the filtration efficiency and the service life of the air filters.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2022
·Vol. 95
·期 3
·430-435
·
IF 0.869
Zezhong Jiang,Haiyue Wang,Rongrong Zheng,Kun Liu,Qiao Zhou,Lei Han,Liying Guo
Abstract Supramolecular ionic liquid catalyst (SILC) was synthesized from 1,4-bis(2-hydroxy-ethoxybenzene) by substitution, ring-opening and cyclization reaction, etc. The chemical structures of SILC were characterized by FTIR and 1 HNMR. The catalytic performance of SILC was evaluated in a continuous distillation reactor for the synthesis of dimethyl carbonate from vinyl carbonate and methanol. And the service life of SILC was investigated. The results showed that the catalytic performance of SILC was not ideal when used alone, but the catalytic performance of the basic co-catalyst was significantly improved. Under the conditions of methanol and vinyl carbonate molar ratio of 10 : 1, the conversion rate of vinyl carbonate was 75.6%, and the selectivity of DMC was 91.4% at 110℃ for 4 h. The catalytic system can still maintain stable catalytic effect after being used for 6 times.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Li Yang,Ma Hairun,Li Qianwei,Yan Guangxu,Guo Shaohui
Ti/SnO 2 -Sb electrodes possess high catalytic activity and efficiently degrade nitrobenzene (NB); however, their low service life limits their wide application. In this study, we used one-step hydrothermal synthesis to successfully prepare Pt-Nd co-doped Ti/SnO 2 -Sb nanosphere electrodes. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were applied to characterize the surface morphology, microstructure, and chemical composition of the electrodes, respectively. The electrochemical activity and stability of the electrodes were characterized via linear sweep and cyclic voltammetry, electrochemical impedance spectroscopy, and an accelerated service life test; their performance for NB degradation was also studied. An appropriate amount of Pt-Nd co-doping refined the average grain size of SnO 2 and formed a uniform and compact coating on the electrode surface. The oxygen evolution potential, total voltammetric charge, and electron transfer resistance of the Ti/SnO 2 -Sb-Nd-Pt electrodes were 1.88 V, 3.77 mC/cm 2 , and 11.50 Ω, respectively. Hydroxy radical was the main active radical species during the electrolytic degradation of nitrobenzene with Ti/SnO 2 -Sb-Nd-Pt. After Pt-Nd co-doping, the accelerated service life of the electrodes was extended from 8.0 min to 78.2 h (500 mA/cm 2 ); although the NB degradation rate decreased from 94.1 to 80.6%, the total amount of theoretical catalytic degradation of NB in the effective working time increased from 17.4 to 8754.1 mg/cm 2 . These findings reveal good application potential for the electrodes and provide a reference for developing efficient and stable electrode materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Fiber Materials
·
2024
·Vol. 6
·期 3
·852-864
·
IF 17.2
Su Hongwei,Hu Hua,Li Zhenyu,Yan Guilong,Wang Li,Xiang Dong,Zhao Chunxia,Wu Yuanpeng,Chen Jingyu,Wang Ce
High-performance multifunctional filtration membranes are highly required in treating practically complex oily wastewater systems, but still a challenge unsolved. Herein, we propose a facile route to address these challenges simultaneously by simply constructing electrospun pre-oxidized polyacrylonitrile nanofibrous membrane (p-PAN NM). Given the pre-oxidation process, the p-PAN NM displays not only robust anti-corrosive tolerance against diverse corrosive media, but also superhydrophilicity/underwater superoleophobicity. Additionally, ~ 99% separation efficiency, ~ 100% oil-fouling recovery, and ultra-long service life (up to 265 h) have been realized in separating large-scale surfactant stabilized soybean/crude oil-in-water emulsions. Furthermore, strong anti-corrosive performance against various corrosive media (e.g., 1 M HCl, 1 M NaOH, or 10 wt% NaCl) has been achieved as well. Spin-unrestricted density functional theory (DFT) computations implemented in the Dmol3 modulus has been conducted to understand the robust fouling recovery and the variation of surficial wettability after pre-oxidation. These outstanding filtration functions make our NM hold great potential in separating viscous oil/water emulsions under harsh conditions. Graphical Abstract
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zian Wang,Shuqiang Peng,Lixin Wu,Zixiang Weng
Benefiting from its low surface energy, low surface tension and high efficiency of droplet mobility, Slippery liquid infused porous surfaces (SLIPS) are being applied in the fields like self-cleaning, anti-icing, thermal transfer etc . Nevertheless, the short service life and the complex preparation procedures are still hindering its further practical applications. In this work, with the combination of UV-curing technique and atom transfer radical polymerization (ATRP) treatment, superhydrophobic surface (SHS) with a chemical stability in a corrosive environment and an excellent mechanical resistance is prepared in a facile way. Profiting from the ultra-high affinity between SHS and lubricant oil, as-prepared SLIPS based on SHS exhibited an ultra-long service life. Compared with other commonly used SLIPS, the service life of resultant SLIPS in this work extends 50 times, which can bear a 3000 mL of continuous water droplet washing. As-prepared SLIPS is a promising candidate for the application in self-cleaning.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 25
·19601-19612
·
IF 3.84
Tigang Duan,Ye Chen,Qing Wen,Ying Duan
Sb-doped SnO2 electrode was fabricated by the one-step pulse electro-codeposition method, and was modified through either cerium dioxide nanoparticle (nano-CeO2) or cerium ion doping. The results showed that the effects of nano-CeO2 doping and cerium ion doping are quite different. Nano-CeO2 doping shrinks the unit cell volume, improves the degree of crystallinity and refines crystalline grains, while cerium ion doping expands the volume and deteriorates the crystallinity. Nano-CeO2 doping mitigates the surface antimony enrichment and promotes the complete oxidation of antimony so that the majority of antimony oxidation states exist as the Sb5+ state, but cerium ion doping aggravates the enrichment and increases the Sb3+ content. Electrochemical phenol degradation showed that the Ti/Sb–SnO2–CeO2 electrode has a higher degradation efficiency and its kinetic rate constant is 1.46 times as much as that of Ti/Ce–Sb–SnO2. Besides, due to the compact active layer of Ti/Sb–SnO2–CeO2 protecting the titanium substrate from passivation, the accelerated service lifetime of Ti/Sb–SnO2–CeO2 is prolonged, which is 1.28 times as long as that of Ti/Ce–Sb–SnO2.
研究领域:
电化学
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Xueye Wang,Hongyi Han,Huimin Zhou,Tianlin Wang,Ruobin Dai,Zhiwei Wang
Membrane separation is widely adopted in many industries, and the membranes reach their end of life (EOL) after long-term use. However, the conventional approach of replacing EOL membranes has a high carbon footprint, hindering the development of a green, low-carbon, and carbon-neutral process. In this study, we developed a cleaning–tannic acid-iron (TA-Fe)-healing–interfacial polymerization strategy with a reaction time of less than 20 min for the upcycling of an EOL microfiltration (MF) membrane. The cleaning step could remove most of the foulants from the EOL membrane. The TA-Fe healing step decreased the surface pore size and increased the hydrophilicity of the cleaned membrane, offering a more favorable platform for the storage of amine monomers required for interfacial polymerization. The upcycled NF-Healed membrane possessed a Na2SO4 rejection of 96.9 ± 0.7% and high pure water permeance of 23.7 ± 1.4 L m–2 h–1 bar–1. An economic analysis indicated that the chemical cost for upcycling was ∼$4.9/m2 membrane, which was lower than the estimated cost to replace the EOL MF membrane. This study provides a rapid and cost-effective method for the upcycling of the EOL MF membrane, which is a promising strategy to close the sustainable loop in the membrane materials.
研究领域:
环境工程
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材料科学
·
水处理
·
可持续性
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·21632-21645
·
IF 0
He Yuanzhen,Zhong Dengjie,Xu Yunlan,Zhang Jiayou,Jiang Ran,Liao Pengfei
In this paper, La-doped Ti/SnO 2 -Sb 2 O 4 electrode was prepared by electrodeposition and used for electrochemical degradation of rhodamine B. The optimum preparation conditions of the electrode were optimized as deposition time of 15 min and calcination at 500 ℃ for 2 h. The water treatment conditions were selected as initial pH 3.0, electrolyte Na 2 SO 4 concentration 0.1 M, current density 30 mA cm −2 , and initial rhodamine B concentration 20 mg L −1 ; the color and TOC removal of RhB reached 99.78% and 82.41% within 30 min. The FESEM, XRD, XPS, CV, LSV, and EIS characterization studies demonstrated that Ti/SnO 2 -Sb 2 O 4 -1%La electrode had a dense structure and the highest oxygen evolution potential (2.14 V) and lowest charge transfer resistance (0.198 Ω cm −2 ), indicating that doped La has lower energy consumption. Moreover, La doping can expand the specific surface area, active site, performance of pollutant degradation, and service life of the electrode. Especially, the service life of Ti/SnO 2 -Sb 2 O 4 -1%La is increased by three times, and the maximum life span reaches 90 min (1000 mA cm −2 , 1 M H 2 SO 4 ). Free radical quenching experiments show that ·OH plays a major role in the degradation of RhB. The Ti/SnO 2 -Sb 2 O 4 -1%La electrode prepared in this paper and its results will provide data support and reference for the design of efficient electrocatalytic electrode. Graphical
研究领域:
电化学
·
环境科学
·
材料科学
·
水处理技术
✓ 已验证
DOI
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2019
·
IF 4.527
Ying Zhang,Ping He,Lianhong Zhou,Faqin Dong,Dingming Yang,Hong Lei,Licheng Du,Lingpu Jia,Shiping Zhou
The presence of pesticides in water has emerged as a momentous environmental issue over the past decades. Herein, a terbium doped Ti/PbO 2 (denoted as Ti/PbO 2 –Tb) dimensionally stable Ti/PbO 2 –Tb anode has been successfully prepared by one-step electrodeposition path for electrocatalytic degradation of imidacloprid (IMD) wastewater with high efficiency. Ti/PbO 2 –Tb electrode presents higher oxygen evolution potential, lower charge transfer resistance, stronger stability, longer service lifetime and outstanding electrocatalytic activity than Ti/PbO 2 electrode. The optimum condition for IMD oxidation is obtained by analyzing the effects of some critical operating parameters including temperature, initial pH, current density and electrolyte concentration. It is proved that 70.05% of chemical oxygen demand and 76.07% of IMD are removed after 2.5 h of degradation under current density of 8 mA cm −2 , pH 9, temperature 30 °C and 7.0 g L −1 NaCl electrolyte. In addition, the electrode displays commendable energy saving property as well as favorable reusability. The degradation mechanism of IMD is proposed by analyzing the intermediates identified by LC-MS. The present research provides a feasible strategy to degrade IMD wastewater by Ti/PbO 2 –Tb electrode.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Gaoyi Yi,Baian Ji,Jianjun Du,Jiahao Zhou,Zhiyi Chen,Yang Mao,Yiwen Wei,Zhining Xia,Qifeng Fu
Exploring the innovative strategies for improving the enantioseparation performance of CDs-based electrokinetic chromatography (CD-EKC) has great significance for chiral separation. In this study, a novel quinine (QUI) modified polydopamine (PDA) coated capillary (QUI/ [email protected] ) was firstly fabricated via the chiral alkaloid-inducing co-deposition strategy and applied for enhancing the enantioseparation performance of CD-EKC using QUI as the immobilized auxiliary modifiers. With the assistance of solvothermal process, the one-pot co-deposition process of QUI/PDA coating was rapidly completed within 60 min, significantly improving the preparation efficiency and simplifying the coating procedure. The successful preparation of the QUI/PDA coated capillary was confirmed by several measurements. Compared with the unmodified, PDA coated and PDA/branched polyethyleneimine (PEI) co-deposited capillaries, significantly improved enantioseparation performances of eight chiral analytes were observed using QUI/ [email protected] and baseline separation with high efficiency was all easily obtained. The possible mechanism of the remarkably enhanced enantioseparation obtained using QUI/ [email protected] was also investigated. The relative standard deviations (RSDs) of the enantiomers’ retention times for intra-day, inter-day and column-to-column were all less than 5%. Moreover, the fabricated QUI/PDA coated capillary possessed good stability and long lifetime. These results show the promising prospects of PDA-assisted modification strategy for enhancing the enantioseparation performance and applicability of CD-EKC.
研究领域:
分析化学
·
色谱学
·
材料科学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 17
·2390
·
IF 4.9
Guixiang Xie,Yaqi Lu,Xiaochun Lu,Zhusen Zhang,Shuidong Lin
Thermogravimetric analysis (TGA) has been extensively applied in polymeric characterization and quality inspection, facilitating in-depth investigations of the microstructural thermal response characteristics of polymers, including thermal stability, composition analysis, and thermal decomposition mechanisms. Here, the impacts of six factors on the TG thermal analysis curves obtained during operation are systematically examined while analyzing their causes and recommending solutions. Furthermore, the thermal degradation kinetics of an ionomer formed by neutralizing an ethylene–methacrylic acid copolymer with metal ions (SGP membrane) used in laminated tempered glass is analyzed using the Arrhenius equation, Ozawa–Flynn–Wall hypothesis and Kissinger method. Kinetic parameters at 5% degradation are fitted and used to predict the service lifetime of the SGP membrane. The results indicate that the SGP membrane sample exhibits activation energyEa= 136.90 kJ/mol, reaction ordern= 1.65 and pre-factorA= e25.93. It can be seen that the service lifetime of the SGP membrane sample is 16 years at 80 °C and 1.65 years at 100 °C.
研究领域:
高分子科学
·
热分析
·
材料化学
·
动力学建模
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）