SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wentao Li,Jianwei Guo,Haojie Du,Dong Wang,Jianwei Cao,Zhi Wang
Remove of trace Al 3+ from rare earth solutions is a challenging task. In the present study, an aluminum ion imprinted polymer (Al (III)-IIP) has been fabricated by surface-imprinting method. Al (III)-IIP was obtained by grafting silica gel with aminopropyl triethoxysilane and acrylic acid (AA). The structure and morphology of the polymer were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and thermogravimetric analysis (TG). The densification degree and the number of grafted functional groups were regulated by changing the synthesis conditions, and the optimal synthesis conditions are obtained as template ion: functional monomer: crosslinker = 1:8:8, and the optimal synthesis temperature is 333.15 K. The adsorption performance and selectivity properties of Al (III)-IIP were also investigated. The results show that at 298.15 K, the optimal pH for Al 3+ adsorption is 4. The maximum adsorption capacity is 106.0 mg·g −1 at an Al 3+ ion concentration of 1000 mg·L −1 , which is 50% higher than that of reported recently. In addition, the adsorption process reaches equilibrium within 180 min. Furthermore, among many adsorption models and isothermal models, pseudo-second-order (PSO) adsorption model and Langmuir isothermal model are more suitable for the adsorption process. The selectivity coefficient of the Al 3+ ion in binary mixtures of Nd 3+ , Ca 2+ or Mg 2+ are 17.76, 16.72 and 11.09, respectively. In addition, the adsorption mechanism of Al 3+ is most probably caused by the formation of ionic bond between the Al 3+ ions and the carboxyl functional groups on Al (III)-IIP and template effect. Results show that Al (III)-IIP has a great potential for a selective separation of aluminum ions from rare earth solutions.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Wendong Xing,Zhongfei Ma,Chong Wang,Jia Gao,Chao Yu,Yongsheng Yan,Li Yan,Chunxiang Li,Yilin Wu
Molecularly imprinted membranes (MIMs) have been considered as a promising material for the treatment of intractable micropollutants due to their predetermined selectivity and high stability. Herein, we proposed an exclusive design by incorporation of heterogeneous porous UiO-66-NH 2 and hierarchically porous structure nanofibrous membranes to fabricate a MOFs based hierarchically porous molecularly imprinted nanofiber membranes (HP-MINMs) with multiple mass transfer channels, achieving efficient selective removal of atrazine (ATZ). The heterogeneous pores UiO-66-NH 2 nanoparticles as matrix facilitated loaded with more densely and accessible imprinted recognition sites. Meanwhile, the multiple transfer channels formed in well-designed hierarchically porous nanofibrous membranes significantly enhancing of permeation flux and increase the contacting efficiency of target molecules with selective recognition sites. As a result, the obtained HP-MINMs possess synchronous enhanced permeation flux ( J = 0.40 × 10 −3 , 1.01 × 10 −3 and 1.07 × 10 −3 mg min −1 cm −2 ) and permselectivity factors ( β = 3.22 and 3.52), which much superior to those pure molecularly imprinted nanofiber membranes and other references. Importantly, the impressive selective separation performance (the separation efficiency for ATZ is 60.7 %) was achieved in continuous separation process. The presented work provides a fresh idea for addressing the trade-off effect in selective separation of MIMs.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Tong Wen,Yunliang Zhao,Xingwen Wang,Licai Chen,Renbo Gao,Shutong Wang,Tingting Zhang
Recent innovations have created various two-dimensional membranes to break the Li + /Mg 2+ selectivity limit of traditional separation membranes. However, the simultaneous achievement of ultrafast transport and high selectivity is still below the theoretical prediction. Herein, for overcoming these shortcomings, the two-dimensional montmorillonite membrane (2D MMT membrane) consisting of sulfonated polyvinyl alcohol (SPVA), ethylene glycol (EG), and polyacrylamide (PAM) is proposed based on the design of porous 2D nanochannels. It is found that the SPVA can effectively improve the membrane stability, but will densify the channel, and prevent ion transport. When the appropriate EG is included in the membrane component, the transport rate of Li + can be increased from 0.29 mol h −1 m −2 to 0.56 mol h −1 m −2 . However, because the transport of Mg 2+ needs to overcome the high dehydration energy barrier, the J Mg2+ changes little, hence increases in S Mg 2+ Li + from 4.1 to 7.3. In addition, the selectivity regulation of PAM can be further integrated, and the permselectivity of the membrane is improved to 9.2 due to the strong selective coordination of amide groups to Mg 2+ . This novel strategy provides a valuable reference for developing high-performance 2D MMT membranes, which can also promote the application of 2D membranes in the Li + /Mg 2+ separation.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2023
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IF 9.8
Yi Luo,Chengzhe Yin,Leming Ou
Deep eutectic solvents (DESs) possess excellent solubility and selectivity , making them suitable for extracting valuable metals and serving as a green alternative in the recycling process. This work introduces a low-viscosity DES consisting of dimethylthetin, oxalic acid , and water for the comprehensive recovery of cathode materials from LIBs. Leaching parameters such as ratio (1:1), leaching temperature (60 °C), and reaction time (15 min) for were systematically optimized, resulting in a selective separation efficiency of 99.98 % for lithium ions. Furthermore, in-situ regeneration of the precursor can be achieved during the leaching process. Charge-discharge tests indicate that the initial charge and discharge capacities of the regenerated battery are 166.8 mAh/g and 138.4 mAh/g, respectively. The DES demonstrates stability and can be easily recycled by replenishing the consumed components. This proposed strategy facilitates the reintroduction of nonrenewable resources into the supply chain and reduces the environmental impact of heavy metals, aligning with the principles of a circular economy .
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Zhiyong Li,Yu Chen,Zhenzhen Wang,Yang Zhao,Qingchun Xia,Jikuan Qiu,Huiyong Wang,Jianji Wang
Efficient adsorption and selective separation of ammonia at high temperature is a crucial and challenging issue. In this work, a series of stable ionic liquid hybrid materials have been developed by simple impregnation of ionic liquids into stable metal–organic framework Al-fum with 1D pores. The hybrid material [C 2 N][Zn 3 Cl 7 ]@Al-fum-60% exhibited an exceptionally high uptake (9.9 mmol/g at 80 °C, 8.8 mmol/g at 100 °C) at high temperature, excellent uptake (9.8 mmol/g at 25.0 °C) at low ammonia concentration (100,000 ppm), and remarkable selective separation performance (selectivity factor is 25.1) of NH 3 from NH 3 /CO 2 mixture at high temperature. The NH 3 uptake of [C 2 N][Zn 3 Cl 7 ]@Al-fum-60% at 100 °C was higher than the capacity of most of typical porous NH 3 adsorbents at room temperature. It is revealed that such superior NH 3 capacity and selective separation performance are mainly attributed to coordination interactions of NH 3 to Zn centre of the ionic liquids and the hydrogen bonding interactions of NH 3 with Cl of the ionic liquids and NH 3 with μ-OH of Al-fum.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Lelin Zeng,Qin Yi,Xiaohui Peng,Zhi Huang,Bart Van der Bruggen,Yusheng Zhang,Yan Kuang,Yingnan Ma,Kewen Tang
Polymer inclusion membranes (PIMs) have much application potential for metal ion separation. However, its separation selectivity highly depends on the extractant, and new efficient extractants are difficult to develop. This work proposes another approach, i.e., adding a complexing retardant to enhance the selectivity. The impurity ion (e.g., Cu 2+ ) was retarded in the feed solution by the complexing retardant (e.g., citric acid), while the target ion (e.g., Zn 2+ ) was transported across PIM. To reveal the enhancement mechanism, a mass transfer mathematical model was established. Contrast experiments proved that the complexing retardant can significantly enhance the overall separation coefficient β overall,exp . The β overall,exp of a conventional PIM system was 61.80, while β overall,exp increased to 853.45 after the retardant was added. The effects of retardant concentration, initial pH of feed solution, membrane thickness, extractant dosage, and plasticizer dosage on the retardant-enhanced PIM system were investigated. Model calculation results agreed well with the experimental data. The maximal β overall,exp 17525.68 was obtained at the optimal separation conditions of [CA] f,0 = 0.02 M, pH f ,0 = 4.5, [H 2 SO 4 ] s ,0 = 0.5 M, and the optimal composition of the PIM casting solution, i.e., PVC : P507: DBP: THF = 0.125 g: 0.188 mL: 0.032 mL: 10 mL. Further studies indicated that the retardant mechanism was reflected in the difference increase of interfacial partition coefficients P Zn 2 + , f and P Cu 2 + , f . Finally, the optimization strategies of the separation effects for the retardant-enhanced PIM system are discussed in depth based on the simulated calculation.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Dan Lu,Tao Ma,Saisai Lin,Zhijun Zhou,Ge Li,Quanfu An,Zhikan Yao,Qi Sun,Zhilin Sun,Lin Zhang
The separation of Li + and Mg 2+ is a decisive step for achieving high-grade lithium extraction from salt-lake brines to circumvent the lithium supply shortage and sustainability. However, polymer nanofiltration membranes suffer from low lithium selectivity and are hindered by complicated preparation and miniaturized scales. Here, we report a facile surface charge-inversion strategy via a unique secondary non-aqueous medium interfacial reaction of polyethyleneimine to construct a selective positive-nanolayer on nanofiltration membranes surface for selective separation of lithium ions from concentrated magnesium/lithium mixtures. The introduction of amine moieties not only increases the Donnan potential but also improves the compactness of the membrane, which simultaneously enhances the Donnan exclusion and size sieving for the Mg 2+ ion with higher valence and larger hydration ion size. The surface interaction theory (DLVO) verified that the high positive-charge density provided an excellent selectivity to allow passage of Li + but reject Mg 2+ , and the separation factor ( S Li/Mg ) achieved 12.37 at a high Mg 2+ /Li + mass ratio of 150. Such highly positive transmembrane potential barrier simultaneously endowed the membrane surface with the anti-fouling performance against Ca 2+ . We anticipate that our facile and scalable surface charge-inversion will greatly advance lithium ions permselectivity membranes design and application in lithium extraction.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Weijia Gong,Yanrui Wang,Haotian Zhang,Haochun Wang,Meng Zhang,Xiaobin Ma,Wenjun Cheng,Hailin Chang,Xiaobin Tang,Heng Liang
Rapid water permeability and precise solute–solute separation are both important for high-end nanofiltration (NF) membranes. Yet, current NF membranes suffer from high energy consumption or low efficiency because of a trade-off between membrane permeability and selectivity. An intricately designed polyamide (PA) separation layer can be used to construct high permeability-selectivity NF membranes. Inspired by the asymmetric structure between the surface and bottom layers of leaves, an innovative asymmetric leaf-like PA composite membrane with a highly ordered nanochannel bottom layer and loose PA surface layer structure was produced using alkali-induced MXene (AMXene) nanosheets. In this endeavor, small amorphous AMXene nanosheets were embedded in the bottom layer of the PA network via electrostatic attraction and hydrogen bonding to create short low-resistance 2D water transport nanochannels. These shorter nanochannels overcame the disadvantages of conventionally constructed nanofiltration membranes with long tortuous nanochannels comprising 2D nanosheets by reducing the transverse transmission resistance during NF. Furthermore, a loose ultrathin (18.48 nm) hydrophilic PA surface with low intrinsic resistance to water transport was obtained by limiting the diffusivity of interfacial-polymerized piperazine via the highly hydrophilic and electronegative AMXene nanosheets. Consequently, the water permeability of a thin-film nanocomposite membrane fabricated with 0.002 w/v% AMXene significantly increased by 1.63 times (17.48 L m -2 h −1 bar −1 ) over that of one prepared without the nanosheets owing to the reduction of transverse and normal energy barriers. Moreover, the asymmetric leaf-like PA composite membrane conferred a more homogeneous pore size distribution and more precise selectivity for targeted ion species of various sizes compared to conventional nanofiltration membranes. These findings provide new insights for manufacturing fast water-permeable NF membranes.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 16
·3868
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IF 4.2
Minjia Meng,Jiajia Ren,Chuanxun Zhang,Wanqi Du,Jixiang Wang
A traditional phase transformation method is commonly used to prepare molecular imprinting membranes for selective separation. However, traditional molecularly imprinted polymers are mostly micron-sized particles, and the imprinting sites in their membrane are easily embedded, leading to a reduced adsorption capacity and decreased selectivity. In this study, an ultra-long nanowire with a diameter of about 15 nm was synthesized for the separation of artemisinin (ART), and its adsorption capacity was as high as 198.29 mg g−1after imprinting polymerization. Molecular imprinting membranes were prepared, using polyvinylidene fluoride (PVDF), polyethersulfone (PES), and polysulfone (PSF) as the membrane matrix, for comparison. The average membrane pore size of PVDF-MIM was about 480 nm, and PVDF-MIM had the highest adsorption capacity (69 mg g−1) for ART. The optimal flow rate for PVDF-MIM’s dynamic adsorption of ART was 7 mL min−1. Under this optimal flow rate, selectivity experiments were carried out to obtain the separation factor of PVDF-MIM (α = 8.37), which was much higher than the corresponding values of PES-MIM and PSF-MIM. In addition, the hydrophobicity and low flux of PES-MIM and PSF-MIM lead to higher non-specific adsorption. The hydrophobicity of PVDF-MIM is lower than that of PES-MIM and PSF-MIM, which greatly reduces the non-specific adsorption of the membrane, thus increasing the selectivity of the membranes. Therefore, the effective density of the imprinting sites in the pores and the membrane structure are the main factors determining the efficient separation of molecularly imprinted membranes.
研究领域:
材料科学
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药物化学
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Xian Cheng,Miao-Miao Long,Sheng-Nan Li,Peng-Fei Li,Pan-Pan Li,Liang-Wu Bi,Yu-Xiang Chen
For the first time, a novel porous organic polymer (POP), namely Cin-POP, was constructed under normal temperature and pressure using less toxic basic fuchsin and natural cinnamic acid. Cin-POP was synthesized through the diazo-coupling reaction between the diazonium salts of basic fuchsin and cinnamic acid. The FT-IR spectra and XPS analysis prove the successful construction of the Cin-POP, and the BET analysis demonstrates the high-surface-area (166.42–202.56 m 2 g −1 ) and suitable pore sizes (11.00–18.63 nm). Owing to the advantages of porous structures, abundant aromatic groups, good thermal stability, and good dispersity, Cin-POP exhibits remarkable adsorption rates and capacities towards polyphenols, including procyanidine and rutin. Especially for procyanidine, the extraction efficiency can arrive at nearly 98.1 % after 2.5 min adsorption, and the pseudo-second-order rate constant (k 2 ) of Cin-POP is 0.0257 g mg −1 min −1 . The maximum adsorption capacities of Cin-POP towards procyanidine and rutin are 2500.00 mg g −1 and 1814.83 mg g −1 , outpacing all reported adsorbents. In addition, Cin-POP can selectively adsorb polyphenol among the mixtures of polyphenols and alkaloids. More importantly, Cin-POP can be used for polyphenols separation from complex cinnamon extract. All the above advantages make Cin-POP comparable porous adsorbent for polyphenol separation.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2024
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IF 2.8
Lusheng Huang,Xu Zhou,Nasha Wu,Yaqin Sun,Zhilong Xiu
BACKGROUND Conventional methods for the separation of 1,3-propanediol (1,3-PDO) are problematic in many ways. The study of a simple and efficient separation process was the key to solving the bottlenecks that have restricted the large-scale development of 1,3-PDO. In order to solve the difficulty of separating 1,3-PDO from fermentation broths, a ternary selective extraction system was constructed to separate 1,3-PDO from a simulated solution and fermentation broth. RESULTS In this study, quantum chemistry calculation and wave function analysis showed that the reaction between phenylboronic acid and 1,3-PDO is thermodynamically feasible, stable and covalently reversible. The ternary extraction system was composed of 1-naphthylboric acid, dichloromethane and Aliquat 336. After optimization of the extraction conditions, a high extraction efficiency of 82.6% could be achieved for 1,3-PDO. Meanwhile, the stripping recovery of 1,3-PDO was over 90%, with a high purity (98.6%), from a simulated solution using 0.4 mol L −1 hydrochloric acid as stripping solution. The extraction selectivity of 1,3-PDO to glycerol, acetic acid and butyric acid in the fermentation broth reached 12.9, 230.6 and 233.7, respectively, implying a high selective performance compared with the aldehyde-based traditional reactive extraction. CONCLUSION The ternary extraction system exhibited good extraction performance, highlighting the potential for selective extraction of diol biochemicals from fermentation broths. © 2024 Society of Chemical Industry (SCI).
研究领域:
生物工程
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Dandan Hao,Ping Wang,Ju Liu,Huanhui Zhan,Tiantian Zhou,Bo Fu
MOF-199 is considered to be an excellent CO 2 adsorbent owing to its substantial specific surface area, suitable pore structure and abundant sorption sites. However, powdered MOF-199 is prone to agglomeration and has poor recyclability. Herein, we proposed a MOF-199-based adsorbent by combining the MOF synthesis process with traditional papermaking process. Through such a design, MOF-199 particles are adhered on the surface of wood pulp fiber. The sufficient hydroxyl groups and electrostatic forces of cellulose facilitates the homogeneous and tight adhesion of MOF crystals. The optimal MP-4 sample demonstrated a high CO 2 adsorption capacity (1.80 mmol·g ‐−1 at 25 °C) and good CO 2 /N 2 selectivity (30.06). Moreover, the composite sorbent can be easily regenerated. The adsorption mechanism was analyzed by the density functional theory approach. The simulation results showed that the carboxyl functional groups with a large number of oxygen atoms and active metal sites are the key to boost the CO 2 adsorption performance.
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
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）