TALANTA
·
2016
·
IF 4.035
Qiang Chen,Junfeng Zuo,Xue He,Xiujuan Mo,Ping Tong,Lan Zhang
In this paper, a simple, rapid and sensitive fluorescence method based on the formation of terbium (Tb 3+ ) complex has been developed for the rapid detection of Tb 3+ in water. The fluorescence sensor has been studied by using terbium complexed with thiabendazole (TBZ) while acetonitrile (MeCN) as solvent. The complex was made up of TBZ as small-molecule ligand and Tb 3+ as central ion. Fluorescence spectroscopy and UV spectroscopy together were used to study the behavior of the complexation of TBZ-Tb in this medium. Enhancement fluorescence was observed due to the efficient energy transfer process from TBZ to Tb 3+ . And the affecting factors of the enhancement fluorescence were also studied in detail. Under optimal conditions, a linear relationship was obtained between the enhanced fluorescence intensity and the concentration of Tb 3+ in a range of 5.0×10 −6 M–3.0×10 −5 M. The sensor was used for the detection of Tb 3+ in river water samples, and the result was satisfactory. In the meantime, a linear relationship was also obtained between the enhanced fluorescence intensity and the concentration of TBZ in a range of 8.0×10 −6 M–4.0×10 −5 M. Moreover, the method was successfully extended for the detection of TBZ in juice samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Hong-cheng Fan,Jing Yu,Rong-ping Chen,Lei Yu
A novel bioflocculant, A-GS408, produced by Klebsiella oxytoca GS-4-08 cultured in acetonitrile (ACN) as sole nitrogen source was investigated in this study. A complete degradation of 1 g l −1 of ACN was achieved in 350 h, and 4.6 g of crude A-GS408 can be obtained in one litter of synthetic medium. The as-prepared bioflocculant exhibits good flocculation efficiency (over 90%) toward Kaolin solution with the aid of Fe 3+ . Chemical analysis showed that the bioflocculant was mainly composed of polysaccharides (46.3%) and proteins (20.6%). FTIR and XPS results indicated the abundant carboxyl, amine and hydroxyl groups in A-GS408 s, which play an important role on Pd 2+ and Cu 2+ adsorption. The adsorption of heavy metals can be well stimulated by Freundlich isotherm equation, and the K f was up to 439.2 mg 1-1/n l 1/n g −1 and 112.2 mg 1-1/n l 1/n g −1 for Pb 2+ and Cu 2+ , respectively. The kinetic fitting results proved that the adsorption of heavy metals by A-GS408 was chemisorption. This study may provide a new method for preparation of bioflocculant, which can not only degrade toxic compound i . e ., acetonitrile, but also can reuse considerable nitrogen source from nitrile-containing wastewater.
研究领域:
环境生物学
·
微生物学
✓ 已验证
DOI
高影响因子
AMB Express
·
2018
·Vol. 8
·期 1
·1-8
·
IF 1.719
Guo Yaping,Chang Hui,Wang Qiaoling,Shao Chenjia,Xu Jianmiao
Acrylonitrile (C3H3N) widely used in chemical raw materials has biological toxicity with –CN bond, so it is the key to removal of cyanide from acrylonitrile wastewater. In our previous research and investigation, a strain was identified as Arthrobacter nitroguajacolicus named ZJUTB06-99 and was proved to be capable of degrading acrylonitrile. In this paper, the strain ZJUTB06-99 was domesticated with acrylonitrile-containing medium and its decyanidation and denitrification in simulated acrylonitrile wastewater were studied. The intermediate product of acrylonitrile in degradation process was identified through gas chromatography–mass spectrometer, as well as the biodegradation pathway of acrylonitrile in wastewater was deduced tentatively. The kinetics equation of biodegradation of acrylonitrile was lnC = − 0.1784t + 5.3349, with the degradation half-life of acrylonitrile in wastewater by 3.885 h. The results of this study showed that the optimum levels of temperature, pH and bacteria concentration to attain the maximum biodegradation were obtained as 30 °C, 6 and 100 g/L, respectively. The disadvantages of the biodegradation with this strain and its possible enhanced method to degrade acrylonitrile in wastewater were also discussed.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhicheng Bai,Teng Huang,Jiahao Shen,Dan Xie,JinJia Xu,Junhui Zhu,Fengqing Chen,Wenbiao Zhang,Jinfeng Dai,Pingan Song
Polylactic acid (PLA) is inherent brittle, flammable, and susceptible to ultraviolet light irradiation, limiting its application in the field of engineering safety. Therefore, advanced PLA composites with toughness and flame retardancy as well as other exceptional engineering performance has garnered significant interest. In this work, a versatile additive (PAHP) was synthesized by nucleophilic substitution utilizing flexible chain (polyphosphazene) as the skeleton and rigid biomass compound (guanine) as a substituent, then fabricating all-in-one PLA composites. The PAHP plays a synergistic flame-retardant role in both the gaseous and condensed phases, improving the flame retardant performance of the composites while effectively enhancing the crystallization and mechanical properties of PLA. Only 5 wt% PAHP within PLA composite can meet the fire-safety requirements of engineering applications (V-0 rating of UL-94) and exhibits a ∼12-folds enhancement in toughness compared to neat PLA. Moreover, the PLA/5% PAHP composite shows excellent ultraviolet shielding effects, blocking approaching 100 % UV isolation under UV-B wavelengths. This work offers a scalable strategy for preparing multifunctional flame-retardant additives, opening up a great promise for the application of high-performance PLA engineering composites in packaging, electronic, and automotive.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Lin Wang,Manman Jia,Hui Jiao,Shukang Ti,Dongmei Yue
Nitrile Butadiene Rubber (NBR) is widely used in aerospace, petroleum exploration, auto parts, and other fields because of its excellent performance. Nevertheless, NBR usually needs to be crosslinked with sulfur or peroxide, which restricts the tensile performance and recyclability of NBR. Herein, a novel strategy was developed to address these issues by introducing dynamic urea bonds into the main chain using a simple, catalyst-free one-pot method. The presence of urea bonds not only provides a large number of hydrogen bonding sites between the molecular chains but also exhibits the remarkable microphase separation properties of thermoplastic elastomers. This approach endows NBR with enhanced dynamic characteristics and significant recyclability. As a result, the as-synthesized multifunctional NBR elastomer (I–A0.5–P0.5) exhibits excellent tensile strength (19.9 MPa), toughness (93.7 MJ m−3), low glass transition temperature (−52 °C), and low compression cold resistance coefficient (0.15 at −55 °C), which are comparable to those of conventionally covalently crosslinked NBR. Importantly, the elastomer can retain its mechanical robustness, chemical structure, and thermal stability after multiple rounds of recycling (after five times of recycling, with a recovery of more than 81%). To broaden the application of NBR products, I–A0.5–P0.5 was crosslinked with sulfur, and its performance was compared with NBR vulcanizates of different acrylonitrile contents. It shows excellent oil resistance and low temperature resistance. Surprisingly, it can also possess the ability to be reprocessed multiple times. This new multifunctional thermoplastic NBR elastomer is of great significance in solving the problem of difficult recycling of traditional NBR and is expected to replace traditional covalently cross-linked NBR.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Jinlong Li,Tingting Li,Changjun Peng,Honglai Liu
Ionic liquids (ILs) of 1-ethyl-3-methylimidazolium acetate ([EMIM][OAC]), 1-ethyl-3-methylimidazolium proline ([EMIM][PRO]), and N,N,N-dimethyl-butylethanol amine glycolic acid ([N1,1,4C2OH][GAC]) are selected as entrainers for the extractive distillation to separate the mixture of acetonitrile and water based on the COSMO-RS method. The isobaric vapor–liquid equilibrium of ternary mixtures containing ILs at atmospheric pressure is determined, verifying that the used ILs can break the azeotropy of acetonitrile and water. On the basis of the thermodynamic analysis, a typical extractive distillation process is designed with Aspen Plus to evaluate the competitiveness of IL entrainers in separation performance. Significant savings of entrainer and energy, in which the solvent ratios in moles reduce from 0.94 to 0.09, 0.12, and 0.12 and the overall heat duties on the reboiler decrease 24.9, 17.5, and 15.4% for [EMIM][OAC], [EMIM][PRO], and [N1,1,4C2OH][GAC], respectively, can be achieved compared with those of ethylene glycol used as the entrainer.
研究领域:
化学工程
·
分离技术
✓ 已验证
DOI
高影响因子
Membranes
·
2021
·Vol. 11
·期 4
·267
·
IF 4.106
Danxia Chen,Xiang Wang,Jianyu Liang,Ze Zhang,Weiping Chen
Commercial separators (polyolefin separators) for lithium-ion batteries still have defects such as low thermostability and inferior interface compatibility, which result in serious potential safety distress and poor electrochemical performance. Zeolite/Polyacrylonitrile (Z/PAN) composite separators have been fabricated by electrospinning a polyacrylonitrile (PAN) membrane and then dip-coating it with zeolite (ZSM-5). Different from commercial separators, the Z/PAN composite separators exhibit high electrolyte uptake, excellent ionic conductivity, and prominent thermal stability. Specifically, the Z/PAN-1.5 separator exhibits the best performance, with a high electrolyte uptake of 308.1% and an excellent ionic conductivity of 2.158 mS·cm−1. The Z/PAN-1.5 separator may mechanically shrink less than 10% when held at 180 °C for 30 min, proving good thermal stability. Compared with the pristine PAN separator, the Li/separator/LiFePO4cells with the Z/PAN-1.5 composite separator have excellent high-rate discharge capacity (102.2 mAh·g−1at 7 C) and favorable cycling performance (144.9 mAh·g−1at 0.5 C after 100 cycles). Obviously, the Z/PAN-1.5 separator holds great promise in furthering the safety and performance of lithium-ion batteries.Keywords:separator;electrospinning;polyacrylonitrile;zeolite;lithium-ion batteries
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2012
·Vol. 51
·期 5
·1205-1214
·
IF 3.919
Xinjian Cheng,Cheng Peng,Daohong Zhang,Shuzheng Liu,Aiqing Zhang,Hui Huang,Jiansheng Lian
Novel cross-linked polyphosphazenes with remendable capacity have been synthesized through the Diels-Alder reactions. Their structure and properties were characterized by NMR, FT-IR, GPC, DSC, TGA SEM, and polarizing microscope. The process of Diels-Alder reaction (D-A reaction) and retro-Diels-Alder reaction (retro-D-A reaction) have been investigated by FT-IR, UV, and DSC. The cross-linked polyphosphazenes exhibited remendable capability only need a thermal treatment when they were cut by blade, any other treatments such as additional monomer or catalyst, surface treatment or pressure were not needed. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Teng Li,Shuai Li,Tongjun Ma,Yi Zhong,Linping Zhang,Hong Xu,Bijia Wang,Xueling Feng,Xiaofeng Sui,Zhize Chen,Zhiping Mao
A novel organic-inorganic hybrid polyphosphazene modified manganese hypophosphite (PZS-MnHP) shuttles was facilely fabricated and applied in enhancing the flame retardance and anti-dripping behavior of PET. The PET containing 5 wt% PZS-MnHP shuttles (PET/FR5.0) possessed a LOI value of 25.3% and corresponding melt-dripping was greatly restricted with few droplets. Incorporating 5 wt% PZS-MnHP shuttles also brought about dramatic decrease in the fire hazard of PET, for instance, 57.0% maximum reduction in heat release rate. Moreover, the tensile strength of PET/FR5.0 composite was gradually increased from 50.87 MPa to 55.68 MPa, relevant elongation at break was enhanced by 7.2% compared with that of PET. The flame-retardation mechanism of PZS-MnHP shuttles in PET was also systematically investigated. The results showed PZS-MnHP shuttles extremely accelerated the formation of intumescent char, cutting off the supply of external oxygen and heat. Moreover, inflammable gases including SO 2 and NH 3 released from PZS-MnHP shuttles efficiently diluted combustible organic volatiles in burning area, further blocking the spread of fire.
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
BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Yingying Qi,Fu-Rong Xiu,Minfeng Zheng,Baoxin Li
Ultralow concentration and selective detection of pesticide residue is important to evaluate the environmental and biological pollution and the threat to human health which single component pesticide can bring. Herein, we report an amplified chemiluminescence (CL) sensing platform for ultrasensitive and selective acetamiprid (widely used pesticide) detection. It is based on aptamer's high binding affinity to target and the relevance between AuNPs' morphology and its catalytic effect to stimulate the generation of CL in the presence of H 2 O 2 and luminol. Moreover, AuNPs morphological slight change induced by aptamers’ conformation during targets binding could lead to the significant change of catalytic properties . Therefore, the proposed sensing platform for pesticide residue exhibited a high sensitivity toward acetamiprid with a detection limit of 62 pM, which was about 100-fold lower than that of other aptamer-based sensor for acetamiprid detection. Because of the intrinsic specificity of aptamer's recognization, this sensing platform has high selectivity . So, this sensing platform provides a label-free and cost-effective approach for sensitive and selective detection of single component pesticide residue. More importantly, this CL method was successfully used to determine acetamiprid in real contaminated samples.
研究领域:
分析化学
·
环境科学
·
生物传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 5
·997-1006
·
IF 2.578
Xinyao Lv,Wei Zeng,Zhiwang Yang,Yaoxia Yang,Yun Wang,Ziqiang Lei,Jinling Liu,Denglong Chen
A novel zeolitic imidazolate framework (ZIF-8) nanoparticles@polyphosphazene (PZN) core-shell architecture was synthesized, and then, ZIF-8@PZN and ammonium polyphosphate (APP) were applied for increasing the flame retardancy and mechanical property of epoxy resin (EP) through a cooperative effect. Herein, ZIF-8 was used as the core; the shell of PZN was coated to ZIF-8 nanoparticles via a polycondensation method. The well-designed ZIF-8@PZN displayed superior fire retardancy and smoke suppression effect. The synthesized ZIF-8@PZN observably raised the flame retardancy of EP composites, which could be demonstrated by thermogravimetric analysis (TGA) and a cone calorimeter test (CCT). The chemical structure of ZIF-8@PZN was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). Compared with pure epoxy, with the incorporation of 3 wt% ZIF-8@PZN and 18 wt% APP into the EP, along with 80.8%, 72.6%, and 64.7% decreased in the peak heat release rate (pHRR), the peak smoke production rate (pSPR), and the peak CO production rate (pCOPR), respectively. These suggested that ZIF-8@PZN and APP generated an intumescent char layer, and ZIF-8@PZN can strengthen the char layer, resulting in the enhancement in the flame resistance of EP.
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
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Xihua Wei,Ou He,Yucong Jiang,DongPing Shen,Lianzhong Zhang
Performance of some novel mixed solvents as entrainers was tested for acetonitrile dehydration by extractive distillation. The mixed solvents are composed of ethylene glycol (EG) and choline chloride (ChCl) (EG + ChCl 8:1, EG + ChCl 4:1, EG + ChCl 2:1, and EG + ChCl 4:3), ethylene glycol (EG) and glycerol (EG + glycerol 1:1, EG + glycerol 1:2, EG + glycerol 1:4, and EG + glycerol 1:6), and dimethyl sulfoxide (DMSO) and ChCl (DMSO + ChCl 14:1). Isobaric vapor–liquid equilibrium (VLE) data were measured at 101.3 kPa and at a solvent-free acetonitrile mole fraction of 0.95 for the quaternary systems of water + acetonitrile + EG + ChCl, water + acetonitrile + EG + glycerol, and water + acetonitrile + DMSO + ChCl and for the ternary system of water + acetonitrile + DMSO. The NRTL equation was used for the correlation of the experimental VLE data. For all the three quaternary systems and one ternary system, the mean absolute deviations of equilibrium temperature were no more than 0.33 K, and the mean absolute deviations of water and acetonitrile vapor phase mole fractions were no more than 0.0026 and 0.0047, respectively. The mixed solvent EG + ChCl 4:3, which is also a deep eutectic solvent, showed favorable solvent performance. The azeotrope of water + acetonitrile can be removed at a solvent mass fraction of 0.212 or a solvent mole fraction of 0.104. This amount is less than that of EG (0.367 in mass fraction and 0.227 in mole fraction), EG + glycerol 1:6 (0.341 in mass fraction and 0.195 in mole fraction), and DMSO + ChCl 14:1 (0.266 in mass fraction and 0.153 in mole fraction).
研究领域:
化学工程
·
分离科学
✓ 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）