JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Zhenyu Zhang,Juan Liu,Ting Li,Zhikai Fu,Jinshui Mao,Xiaocheng Li,Sili Ren
Recycling of Nd(III) and Dy(III) from waste NdFeB magnets is increasingly critical in the sustainable development of rare-earth elements (REEs) industry. The efficient separation of Nd(III) and Dy(III) from conventional aqueous solution by solvent extraction (SX) is facing huge challenge due to the high activity, high interfacial tension and the high dielectric constants of water that affect the coordination of REEs with the extractant. Herein, a novel non-aqueous solvent extraction (NASX) system based on neutral extractant P350 was developed to extract Nd(III) and Dy(III) with high extraction efficiency and separation factor. In this extraction system, the majority of water in the aqueous phase was replaced by different low-dielectric-constant polar molecular organic solvents (PMOSs) to reduce the influence of water during extraction. The effect of the type and content of PMOSs, P350 concentration, extract equilibration time and temperature on the separation performance were systematically investigated. It was encouraging to find that the favorable separation factor of Nd(III) and Dy(III) elements ( β Nd/Dy ) was determined to be 201 when extracted from 70 vol% PEG 200 with 0.2 mol/L P350, which was higher than that in traditional extraction from aqueous phase. Slope analysis method was used to determine the extractant stoichiometry and the main species of extraction complex was identified as DyCl 3 ·2L which was verified by Fourier infrared spectroscopy (FT-IR). Furthermore, in the simulation of recovery of NdFeB magnetic immersion solution experiment, the extraction efficiency (E%) of Dy(III) can reach 85 %, while co-extraction of Nd(III) was only 6 % and the β Dy/Nd was as high as 83.4. According to the McCabe-Thiele diagram, 3-stages counter-current solvent extraction was needed to completely extract Dy(III). Moreover, 97.11 % of Nd(III) and 98.5 % of Dy(III) in the loaded organic phase can be sequentially stripped by 0.04 mol/L and 0.4 mol/L HCl, respectively. These results indicated that the developed processes in this work have superior extraction efficiency, large separation factors and excellent stripping stability. Eventually, a P350-PEG 200 extraction system-based separation process was proposed in the hope of providing a novel and low-cost alternative to the efficient recycle of Nd(III) and Dy(III) from end-of-life NdFeB.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
KOREA-AUSTRALIA RHEOLOGY JOURNAL
·
2024
·
IF 2.2
Ouyang Xing,Gong Lei,Huang Xiang,Chen Dazhu
Silica/PEG200 shear thickening fluids (STFs) are widely used smart fluids. There is often residual water during the STF preparation process because of the strong water adsorbability due to the abundant hydroxyl group on the silica surface. Residual water usually influences the shear-thickening behavior of STFs. How much influence the residual water has during the preparation processes on the properties of STFs is still a problem. In this paper, six preparation processes were designed, and the influence of residual water content on the shear thickening behavior due to different preparation processes is analyzed. Firstly, three drying processes were used to prepare STFs, i.e., three kinds of silica powder, which were obtained from spray, freeze, or oven drying of the silica dispersion, were dispersed in PEG200 to obtain STFs. Secondly, three wet processes were used to prepare STFs, i.e., three kinds of silica slurry, which were obtained by centrifuging and washing through water, ethanol, or tetrahydrofuran of the silica dispersion, were directly dispersed into PEG200 and dried to obtain STFs. All the silica dispersion used in these six preparation processes was prepared using the Stöber method. The properties, microstructure, and residual water content of the STFs prepared by the six preparation processes were explored. The results showed that the preparation processes have a big influence on the properties of related STFs. The silica’s residual water content derived from different preparation processes is the critical factor that affects STFs’ shear thickening performance. The drying process using silica powder from spray drying of the silica dispersion resulted in the lowest water content and led to the best shear-thickening performance of the corresponding STFs. Meanwhile, the wet process using a slurry obtained by centrifuging and washing through tetrahydrofuran of the silica dispersion could also prepare STFs with good shear thickening behavior. Graphical abstract
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 SURFACTANTS AND DETERGENTS
·
2017
·Vol. 20
·期 6
·1281-1290
·
IF 1.45
Zhang Qian,Li Sha,Zhang Fanglei,Wei Xilian,Liu Min,Liu Jie,Sun Dezhi
The self-assembly behaviors of mixtures of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and didodecyl dimethylammonium bromide (DDAB) in polyethylene glycol 200 (PEG 200) and in water were investigated by surface tension, conductivity, steady-state fluorescence and dynamic light scattering (DLS) methods. The results show that the oppositely charged binary surfactant system can form micelles in PEG 200; the critical micellization concentration (CMC) decreases for the binary system versus those of either surfactant alone. Although there is no charge screening in the PEG 200 system, the CMC values significantly increase and the system does not precipitate or show turbidity at any proportion of AOT to DDAB, while a multiphase composition gap exists in water due to the strong electrostatic attraction. It is speculated that the weak polarity of PEG 200, the decreased solvophobic interaction between the alkyl chain and PEG 200, and the loose structure of the resulting micelles might explain the experimental phenomena. Observed from the values of the interaction parameter, it is found that there are a strong attractive interaction and a synergistic effect between AOT and DDAB in aqueous solution, in comparison, the synergy between them in PEG 200 is very weak.
研究领域:
胶体与界面化学
·
软物质物理
·
溶液化学
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2025
·
IF 4
Zhongxiao Sun,Zhiyong Xu,Jinyu Wang,Xiandong Hao,Wenbo Zhao,Jianming Pan
The traditional chemical absorption method using alkanolamine aqueous solution for carbon dioxide (CO 2 ) capture suffers from high volatility and high energy consumption for regeneration. In the present work, a mixed absorbent comprising diethanolamine (DEA) and polyethylene glycol 200 (PEG200) with high thermal stability and low specific heat capacity was designed for CO 2 absorption. Absorption capacity was measured at different temperatures and pressures; the first-order kinetic and bimolecular reaction thermodynamic models were also developed, and relative parameters were obtained. An optimal simulation of the absorption process was carried out. Based on the optimal control (OC) theory and kinetic parameters, the optimal absorption temperature of the absorption process at a certain fixed time was obtained, which decreases with the increase of time. Moreover, the optimal absorption temperature curve can further enhance the absorption capacity. Furthermore, an entropy–enthalpy compensation phenomenon was found for the capture of CO 2 with different absorbents.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Run Li,Xiandong Hao,Bo Wang,Ning Zhao,Zhiyong Xu,Wenbo Zhao
In the present work, a novel non-aqueous 3-aminopropanol/polyethylene glycol 200 (3AP/PEG200) absorbent for efficient carbon dioxide (CO 2 ) capture was designed using environment-benign and non-toxic polyethylene glycol 200 (PEG200) as an alternative to water. The mechanism, physical, thermodynamic, and kinetic properties of absorption process was investigated through a combination of experimental and multi-scale computational simulation approaches including molecular dynamics (MD) simulation and quantum chemical (QC) calculations. It was found that the addition of PEG200 not only enhanced the thermal stability of the absorbent, but also did not significantly increase the viscosity. In addition, kinetic studies revealed that the absorption process conforms to a pseudo-first-order equation, with the activation energy ( E a ) value of 20.40 kJ/mol, significantly lower than that of the benchmark 30 % monoethanolamine (MEA) aqueous solution used in industrial CO 2 capture. Furthermore, the enthalpy change ( ΔH ) and entropy change ( ΔS ) values were found to be more negative than those of other liquid absorption systems, indicating that the 3AP/PEG200 absorbent is favorable for CO 2 absorption even at low partial pressures. Most importantly, the absorption system exhibited good regeneration capability, as demonstrated by five absorption–desorption cycle experiments. In conclusion, the non-aqueous 3AP/PEG200 absorbent exhibits low viscosity, high thermal stability, enhanced absorption capacity, and excellent cyclic performance, positioning it as a promising candidate for CO 2 absorption in industrial applications.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Yaotai Jiang,Xiaobang Liu,Dongshun Deng
Carboxylate ionic liquid (IL) and polyethylene glycol 200 (PEG200) mixtures are suitable for the absorption of acidic SO2 because of their unique properties. In the present work, tetraethylammonium furoate ([N2222][FA]) and choline furoate ([Ch][FA]) were blended with PEG200 to form 40 wt % ILs/PEG200 mixtures as SO2 absorbents. The solubilities of SO2 in these two ILs/PEG200 mixtures were measured at T = (303.15, 313.15, 323.15, and 333.15) K and pressure up to 1.2 bar. [N2222][FA]/PEG200 demonstrated the high SO2 absorption capacity of 7.224 mol per kg absorbent at 303.15 K and 1.0 bar. The chemisorption mechanism of SO2 by mixture was studied by Fourier transform infrared and nuclear magnetic resonance spectra, and the influence of cations on the SO2 absorption capacity was analyzed. Furthermore, the reaction equilibrium thermodynamic model was used to correlate the experimental data, and Henry’s law constant (H), reaction equilibrium constant (K0), and thermodynamic properties (ΔrGm0, ΔrHm0, and ΔrSm0) were derived. The absorption enthalpies of the two binary mixtures are −46.39 and −23.07 kJ·mol–1 for the two mixtures, respectively. Considering the low cost, biodegradability of the materials, high capacity, and low absorption enthalpy, the [N2222][FA]/PEG200 mixture was regarded to be an attractive and promising alternative to pure ILs and ordinary solvent as a desulfurizer.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Lantong Gou,Xiandong Hao,Zhiyong Xu,Wenbo Zhao
Nitric oxide (NO), a major air pollutant from coal-fired power plants, demands an efficient capture for environmental and industrial applications. Ferrous-based absorbents exhibit promising potential for NO capture due to rapid Fe2+-NO complexation. Herein, a novel nonaqueous FeCl2/PEG200 mixture absorbent was designed by employing FeCl2 as the Fe2+ source and PEG200 as the solvent. The FTIR/UV–vis spectrum confirmed Fe2+-NO complex formation and suggested possible reaction mechanisms. Dynamic sorption experiments were systematically conducted to evaluate sorption performance. Kinetic and thermodynamic analyses obtained activation energy, enthalpy change, and entropy change information. Most importantly, a new sorption kinetic model has been established, which can be used to predict the NO sorption capacity at any temperature and partial pressure. Cyclic sorption─desorption testing demonstrated a high desorption efficiency (>91%) and robust cyclic stability over 4 consecutive cycles. This work establishes the FeCl2/PEG200 system as an efficient, reusable, and scalable candidate for industrial NO capture.
研究领域:
环境工程
·
化学工程
·
工业化学
·
大气污染控制
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Photonics
·
2025
·Vol. 12
·期 8
·742
·
IF 1.9
Yan Zhang,Ming Ma,Zirun Peng,Na Liu,Hanzhuo Zhang,Peizhong Feng,Cheng Xu
The laser damage resistance of optical films holds significant practical importance, as it largely determines both the maximum power output of laser systems and the overall stability of the entire optical assembly. A comprehensive investigation was conducted to examine the influence of both single additives—acetylacetone (ACAC) and diethanolamine (DEA)—and dual-additive systems, specifically ACAC combined with polyethylene glycol 200 (PEG 200) and DEA combined with PEG 200, on TiO2film properties and their laser-induced damage behavior under 1064 nm irradiation. It demonstrated that the films fabricated using ACAC exhibited smoother surfaces. Nevertheless, the sol prepared with DEA was more stable, resulting in films with superior optical properties and an enhanced laser-induced damage threshold (LIDT). The incorporation of dual additives further improved the films’ LIDT. Specifically, the film with DEA and PEG 200 achieved the highest LIDT, reaching 21.5 J/cm2. Moreover, all films exhibited defect-induced damage, yet distinct damage morphologies were observed across different samples. The single-additive films predominantly displayed stress-type damage patterns, whereas the dual-additive films manifested melting-type damage characteristics. Furthermore, through a combination of experiments and calculations, it was revealed that the reasons why the film with DEA and PEG 200 achieved the highest LIDT were twofold: first, the high thermal conductivity of DEA reduced the maximum temperature at the defect center within the film; second, the long molecular chains of PEG 200 created a looser film structure that better mitigated damage caused by stress and expansion during laser irradiation. This study presents a promising approach to enhancing the LIDT through the strategic selection of additives with high thermal conductivity while simultaneously incorporating organic compounds with long molecular chains to develop effective dual-additive films.
研究领域:
光学材料
·
薄膜技术
·
激光物理
·
材料科学
·
应用物理
✓ 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）