SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Ning Wu,Hao Guo,Liping Peng,Mingyue Wang,Yujuan Cao,Meng Yang,Lei Sun,Wu Yang
Thiodiglycolic acid (TDGA) is regarded as a sensitive biomarker for biological monitoring of VCM exposure. A simple, fast and reliable TDGA analysis method is of great significance to human health and the ecological environment. In this work, a novel core-shell nanomaterial based on p-type semiconductor@MOFs (Eu-CBO@Uio-66) is first prepared by in-situ growth and post-synthesis modification (PSM) as a ratiometric fluorescent probe for detecting TDGA, which shows a high sensitivity with a detection limit down to 51.1 μg L −1 (about 0.34 μM), relatively broad linear range (0–700 mg/L), fast response to TDGA within 2 min. As a result, after dispersing the resulting composite material in a solution containing TDGA, the blue emission of Eu-CBO@Uio-66 at 466 nm remains unchanged, while the red emission of Eu 3+ center at 615 nm is significantly quenched, even in coexistence with other potentially analytes in the urine, so that the peak height ratio of the two emissions could be employed for determining TDGA. In addition, the significant ratiometric luminescence response caused by TDGA makes Eu-CBO@Uio-66 undergo a significant color transition from red to blue under UV-lamp, which is beneficial for visual analysis with the naked eye.
研究领域:
分析化学
·
环境科学
·
医学诊断
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2024
·Vol. 81
·期 11
·10351-10367
·
IF 3.1
Wang Guoqiang,Wu Yifan
Polylactic acid (PLA), which is widely used in degradable packaging and medicine, has attracted much attention in recent years. However, PLA's ductility and processability still need to be improved. Previous literature indicated that poly(butylene diglycolate-co-butylene terephthalate) (PBDT) had good ductility, and degradability due to the introduction of diglycolic acid's ether group. Based on the above advantages of PBDT, the PLA/PBDT blends were prepared to improve the ductility of PLA. The blends' thermal, crystallinity, mechanical, and rheological properties and compatibility were characterized. The blends all showed greater elongation at break compared to PLA. The WAXD results showed that the tensile specimens of PBDT were semi-crystalline, and the tensile specimens of PLA and the blends were almost amorphous. The incorporation of PBDT caused the fracture behaviour of the blends to change from brittle to ductile behaviour. It is concluded that PBDT can effectively improve the ductility of PLA and the blend with 20 wt.% PBDT has high elongation at break (135%).
研究领域:
材料科学
·
高分子科学
·
生物降解材料
·
大分子化学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Wanqing Lin,Zhigang Zhao,Fan Yang,Zhaoli Liu,Fengzhi Tan,Meiying Xie,Ying Ma,Lingyi Meng
In this paper, a novel crystalline adsorbent MIL-101-DGA (DGA: Diglycolic Anhydride) is synthesized, which can change the order of traditional rare earth separation. This study is different from previously rare earth separation materials in which it can separate europium (III) first from other rare earth ions. The experiments result show that the separation coefficient (β) of preferentially separated europium (III) and other rare earth ions could reach 53.055, and the maximum adsorption capacity in the experiment was 33 mg/g. Density functional theory was used to calculate the absolute hardness of MIL-101-DGA from the perspective of hard-soft-acid-base theory, which explained the selective adsorption mechanism. Using MIL-101-DGA as an adsorbent, it can effectively recover Eu from the metal impurities Al, Ca, Cu, Mn, Zn and Y from the simulated phosphor leaching solution and has excellent recyclability. In summary, we believe that MIL-101-DGA is a new type of adsorbent that can effectively separate europium from rare earth and transition metal ions.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2025
·
IF 7
Panpan Yang,Sheng Lu,Yuemiao Zhang,Xiaoting Lu,Pengfei Huang,Kun Wu,Jun Shi,Yi Fu
The production of degradable polymer materials with high thermal conductivity is urgently needed to reduce plastic pollution from electronic waste. This research prepared a series of intrinsically thermally conductive polyesters (L-LCPs) by the melt polycondensation reaction of biphenyl diol with three different dicarboxylic acids, which are dl-tartaric acid, dl-malic acid, and diethanolic acid. The thermal conductivity and hydrolysis behavior of these were investigated. Biphenyl group π–π stacking enhances the interchain interactions and endows the polyester with high thermal conductivity. The thermal conductivity of L-LCP3 reaches 0.716 W/(m·K), showing a significant improvement of 168.8% compared to L-LCP1, which is 3.5 times higher than polyethylene terephthalate (PET). The differential scanning calorimetry (DSC) results of the cooling process and the polarizing optical microscopy (POM) pictures showed that all of the L-LCPs are bidirectional thermotropic liquid crystal polymers. Meanwhile, the L-LCPs were efficiently hydrolyzed to valuable raw materials by using the mixed solvents tetrahydrofuran (THF) and H2O. The notable merits of the solvent system are the fragmentation effect of tetrahydrofuran and the enhancement of the catalyst NaOH activity by H2O. The L-LCPs are transformed into oligomers or monomers as the hydrolysis reaction proceeds. The residue weights of L-LCP3 were reduced to 67.2% in the THF–H2O solvent system. The T5%, Tmax, and residual carbon of L-LCP3 were 375.1 °C, 430.4 °C, and 6.2% at 800 °C, respectively, indicating that it has good thermal stability.
研究领域:
材料科学
·
高分子化学
·
热工学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Yunxiao Dong,Yong Yang,Jinggang Wang,Qianfeng Wang,Xiaoqin Zhang,Han Hu,Jin Zhu
With increasing environmental requirements, biodegradable polymers have received widespread attention. Herein, we synthesized a series of poly(butylene diglycolate)s (PBDs), which was a novel biodegradable homopolyester, with number-average molecular weight (Mn) values between 13 and 97 K g·mol–1. The effects of Mn on the thermal and tensile properties of PBDs were comprehensively investigated. The glass transition temperature (Tg), melting temperature (Tm), and temperature of 5% weight loss (Td,5%) of PBDs were found to be approximately −26.4, 64.0, and 336 °C, respectively. PBD with 31 K g·mol–1 exhibits a brittle fracture feature, while obvious yielding behavior occurs when the Mn of PBD is higher than 45 K g·mol–1. Besides, PBD achieves stable mechanical properties when Mn reaches 51 K g·mol–1, with the elastic modulus, tensile strength, and elongation at break of 285, 27.1 MPa, and 290%, respectively, superior to those of linear low-density polyethylene (LLDPE). Furthermore, the crystal structures of PBD were recorded by WAXD and POM. The spherulites were observed after isothermal crystallization of PBD in a wide temperature range, and the maximum nucleation density was obtained after annealing at 20 °C. Significant hydrolysis of PBD in both buffer solution and artificial seawater was confirmed by monitoring the changes in residual weight, intrinsic viscosity, surface morphology, crystallinity, and chemical composition. Finally, PBD exhibits considerable biodegradability under composting and freshwater environments, with the residual weight reducing to 49.2 and 94.7% after 35 days, respectively. Due to the balanced mechanical and barrier properties and biodegradability, PBD has potential application prospects in packaging materials.
研究领域:
材料科学
·
环境科学
·
聚合物化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fukai Li,Aijun Gong,Lina Qiu,Weiwei Zhang,Jingrui Li,Zhe Liu
In this work, magnetic nanomaterials were synthesized by grafting diglycolamide (DGA) derivatives onto polydopamine (PDA) functionalized magnetic nanomaterials (Fe 3 O 4 @PDA@DGA). The adsorption behaviors of Fe 3 O 4 @PDA@DGA for rare earth elements (REEs) were evaluated. The characterization results indicated that the Fe 3 O 4 nanoparticles form a hexagonal-like two-dimensional projection shape, and DGA is successfully grafted onto the surface of the nanomaterials. By using Fe 3 O 4 @PDA@DGA nanomaterials as the adsorption material, a novel method for magnetic solid phase extraction (MSPE) coupled with inductively coupled plasma optical emission spectrometry (ICP-OES) was developed, which can quantitatively determine trace REEs in environmental water. With the MSPE procedure, the parameters affecting the adsorption behaviors of the REEs on Fe 3 O 4 @PDA@DGA nanomaterials, such as pH, ultrasonic adsorption time, mass and solution volume were investigated systematically. Under the optimum experimental conditions, the limits of detections (LODs) and the relative standard deviations (RSDs) of 16 REEs (C = 10 µg L −1 , n = 7) were in the range of 0.039 µg L −1 for Eu to 0.425 µg L −1 for Nd and 1% for La to 3.9% for Gd. The linear range of the calibration curve over 2–1000 ng mL −1 (R 2 > 0.999) was obtained for the target analytes. This developed method was applied for the environmental samples and the recoveries were 95.8–105.8% for the spiked water. The proposed MSPE-ICP-OES method has the advantages of easy separation, simple operation, good anti-interference capability, fast adsorption and elution kinetics, low detection limits, high sensitivity and fast analysis speed, thereby acting as a potential application for the simultaneous analysis of trace REEs in environmental samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Friction
·
2023
·
IF 6.8
Wang Hanwen,Wang Ying,Wen Ping,Ma Lin,Fan Mingjin,Dong Rui,Zhang Chunhua
Development of energy-efficient lubricants is a way to reduce energy consumption for transportation, with the tendency to design molecules that are beneficial in reducing the viscosity of synthetic oils. Oligoether esters (OEEs), as a low-viscosity ester base oil, have characteristics such as simple synthesis and excellent lubrication effect, however, the application of OEEs in tribology field has rarely been investigated. The objective of the present study is to investigate the effect of structure on the lubricating performance of OEEs and to develop a predictive model for OEEs based on quantitative structure-property relationship (QSPR) through a combination of experiment and statistical modeling. Results showed that glycol chains contribute positively to lubrication with the ether functional groups increasing the sites of adsorption. Compared to branched-chain OEEs, straight-chain OEEs exhibited reduced wear, which was mainly due to the thicker adsorption film formed by the straight-chain structure. Furthermore, carbon films were detected on lightly worn surfaces, indicating that OEEs underwent oxidation during the friction process. Based on the results of principal component analysis (PCA) and partial least squares (PLS), it could be found that the predictive models of viscosity–temperature performance, thermal stability performance, coefficient of friction (COF), and wear volume (WV) performed well and robustly. Among them, COF and WV can be best predicted with an R 2 of about 0.90.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yiwen Wang,Yafei He,Aijun Gong,Lina Qiu,Min Zhang,Mory Traore,Xiaoning Zhan,You Li,Yuzhen Bai,Yang Liu,Ge Gao,Weiyu Zhao
We developed an adsorption column that can be used for rare earth recovery from acid mine drainage (AMD). 2-[2-oxo-2-(1-pyrrolidinyl)ethoxy] acetic acid was used as a functional ligand grafted onto amino silica gel , resulting in an adsorbent selective for rare earth metals . Adsorption columns for the enrichment of rare earth metals have been made using this functional silica. A flow rate of 500 µL min −1 and an eluent of pH= 2 0.013 mol L −1 DTPA were determined as the optimum operating conditions. The recovery of actual AMD using SiO 2 @PYRDGA adsorption column achieved 82.29%, 75.66%, 85.10%, 78.43% for Er, Gd, Nd and La, and the purity of rare earth in AMD can be increased about 10 times after recovery. In addition, the thermodynamics, kinetics, adsorption mechanism, and theoretical calculations of the adsorption process were investigated in detail.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Han Hu,Chen Lin,Qingyang Luan,Xiaoyu Jiang,Xiaoqin Zhang,Qianfeng Wang,Yunxiao Dong,Jing Wei,Jinggang Wang,Jin Zhu
Biodegradable polymers tend to undergo relatively slow degradation under natural conditions, facing challenges in ecofriendly applications. The copolymerization modification of the amorphous region of aliphatic–aromatic copolyesters has become an effective method to juggle outstanding comprehensive performance and adjustable degradation. Herein, a series of poly(butylene succinate diglycolate terephthalate) (PBSDT) copolyesters were successfully prepared, realizing synergistic modification of the amorphous phase with diglycolic acid and succinic acid. In detail, PBS40D10T to PBS10D40T were designed to explore the differences in molecular characteristics and properties. We find that the similarity of these two segments reflected in segmental rigidity and domain size, also displaying comparable melting temperature and mechanical properties. The PBSDT copolyesters exhibited higher melting temperature (>141 °C), elastic modulus (>120 MPa), and tensile strength (>25 MPa) than commercial PBAT. Their gas barrier performance achieved 20 times better than PBAT and 4 times better than PLA, also being superior to that of PBAT/PLA blends. The differences of two comonomers were mainly attributed to the oxygen heteroatom of diglycolic acid, reflected in the hydrophilicity and stronger intermolecular interactions, which significantly influenced their crystal growth rate and environmental degradation. Especially, the isothermal crystallization rate (minimum t1/2 < 15s) was the fastest among reported aliphatic–aromatic copolyesters. In addition, the degradation behavior clarified that the preferentially depolymerized diglycolate can be a decisive factor in controlling the degradation rate. Remarkably, synergistic modification by diglycolic acid and succinic acid endowed the access to enhanced hydrolytic degradability in a natural environment, without sacrificing the thermal, mechanical, and gas barrier properties. This work provides a new direction for the high strength-toughness green packagings and alternatives to PBAT with tunable degradation.
研究领域:
材料科学
·
环境科学
✓ 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）