SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Yucheng Liu,Qian Xu,Fuping Li,Fan Yu,Zijian Yu,Kaibo Hu,Hao Chen,Xuewei Li,Chonggang Wang,Dong Han Seo,Ming Xie,Sotto Arcadio,Jiuyang Lin,Youming Yang,Yinhua Wan
Rare earth elements (REEs) are commonly categorized into light (LREEs), medium (MREEs), and heavy (HREEs) groups. Separation between LREEs and MREEs or MREEs is relatively straightforward. However, isolating LREEs themselves is particularly challenging because of their similar ionic radii and identical charges. Traditional separation processes are hindered by drawbacks including low recovery rates for dilute REEs, poor selectivity, complex protocols, and environmental pollution. Consequently, developing a cleaner and more efficient method for LREEs separation is imperative. In this study, we employed a single-module hollow fiber supported liquid membrane (HFSLM) system with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (P507) as an extractant to concurrently extract and strip La 3+ and Nd 3+ from the mixed LREEs containing solutions. We also investigated the impact of flow rate, stripping solution acidity, feed solution pH, P507 concentration, Nd 3+ concentration of feed solution, and the volume ratio between the feed and stripping solutions influence the extraction and stripping of LREEs, as well as the molar fractions of La 3+ and Nd 3+ in the solutions. Under optimal condition, the molar fraction of La 3+ was 99.0% in the feed solution, whereas the molar fraction of Nd 3+ reached 91.6% in the stripping solution. Furthermore, the experimental results demonstrated a consistent preference of P507-HFSLM system for extracting Nd 3+ over La 3+ , and the underlying mechanism was thoroughly investigated. In summary, this study offers comprehensive insights and technical approaches for selective separation and purification of LREEs.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2022
·
IF 4.119
Haitao Zhou,Kun Huang
A new approach using water as the stripping phase for extraction and recovery of low-concentration Ga (III) from concentrated hydrochloric acid solutions by Aliquat 336-based supported liquid membrane (SLM) is suggested. Generally, the stripping of Ga (III) from the loaded organic phase during liquid-liquid two-phase stirring extraction using quaternary ammonium salt as an extractant is extremely difficult. However, in the present work, an efficient mass transfer of low-concentration Ga (III) through the SLM was observed by introducing a low acidity (pH=2) aqueous solution as the stripping phase of the SLM. It was revealed that dissociation of GaCl 4 - and HCl 2 - anions into Ga 3+ , Cl - and H + ions at the stripping/membrane phase interface play an important role in driving the mass transfer of GaCl 4 - from the concentrated hydrochloric acid solutions towards stripping phases. Kinetic analysis suggests that the permeability coefficient of Ga (III) ions through the SLM is dependent on the reaction temperature, extractant Aliquat 336 concentrations, and the difference in Cl - concentrations between the two sides of the liquid membrane phase , but independent of H + concentrations. In view of future’s applications for selective separation and recovery of low-concentration Ga (III) from the concentrated hydrochloric acid leaching solutions of various gallium-containing solid wastes, separation selectivity of Ga (III) against other coexisting metal impurity ions, such as Fe (II), Al (III), Mg (II) and Cu (II), was also evaluated.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Yunqian Zhang,Longqian Xu,Guojie Ye,Chengsi Hou,Deli Wu
Wastewater contains abundant small molecular acids such as acetic acid, but current treatment methods mainly focus on degradation, lacking effective means for recovery. In this study, we propose the use of supported liquid membrane (SLM) for the separation and recovery of organic acids in wastewater treatment. By optimizing the formulation of the liquid membrane and selecting the supporting matrix, we successfully constructed the SLM with superior performance for acetic acid separation, the acetic acid recovery efficiency could be stabilized at over 90 % after 9 hours. The effects of pH, recirculation flow rate, inorganic salt, and organic matter on the separation of acetic acid by this system were investigated and discussed. The primary driving forces for the separation of acetic acid in SLM are the chemical potential gradient and the concentration difference created by the pH difference, and the reaction mechanism and kinetics of this process were thoroughly analyzed. In the performance tests, the SLM exhibited excellent long-term operational stability and regenerative capacity, showing no decline in acetic acid recovery performance after five regeneration cycles. Furthermore, it demonstrated broad applicability for the recovery of various organic acids. Overall, this novel SLM system provides an effective strategy for recovering small organic acids from wastewater, facilitating their resourceful utilization.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2018
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IF 2.795
Lelin Zeng,Yan Liu,Tao Yang,Yunquan Yang,Kewen Tang
Low selectivity and weak stability constantly restrict the industrial application of emulsion liquid membrane (ELM) for metal ions separation. This study proposed an improved ELM system, in which selectivity and stability were simultaneously enhanced for separation of Cd(II)/Cu(II) by adding citric acid and its salt as retardant and buffer difunctional additives. Initially, the separation coefficient ( β Cd/Cu ) in the blank experiment was only 1.15 in 15 min, which indicated that P507 exhibited a poor selectivity as a carrier. After adding citrate additives, the β Cd/Cu of the improved ELM system increased to more than 395.19 for two reasons. Firstly, the selectivity was enhanced by the selective chelation of citrate radicals on the Cu(II) ions, which were trapped in feed solution. Conversely, the Cd(II) ions were preferentially extracted by the P507 and then stripped into internal phase. Secondly, the stability was also improved, because the pH variation in the feed solution caused by the instability of membrane breakage was effectively controlled by the citrate additives as a pH buffer. Important variables in the citrate-enhanced ELM system including total citrate concentration, P507 concentration, dosage ratio of H 3 Cit to Na 3 Cit, H 2 SO 4 concentration, and metal ion concentration were studied, respectively. The scale-up continuous experiment was executed in a pilot-scale modified rotating disc contactor with β Cd/Cu of 859.61, which indicated that the citrate-enhanced ELM has considerable industrial application potential for efficient and steady separation of Cd(II)/Cu(II).
研究领域:
环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
·Vol. 333
·期 4
·2195-2206
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IF 1.5
Li Junze,Zhao Chuang,Guo Wenbin,Gao Yang,Liu Tingting,Zhou Yu,Hou Hongguo,Jiao Caishan,Zhang Meng
Using DMDODGA as the carrier, the transportation and separation behavior of Eu(III) and La(III) were studied using a plate-type supported liquid membrane. La(III) and Eu(III) reach their maximum transport rates at feed phase nitric acid concentrations of 2 and 4 mol/L, which are 72.41 (± 2.12)% and 77.80 (± 2.45)%; Increasing the concentration of NO 3 − in feed phase will promote the transport of both ions. The change of HNO 3 concentration in feed phase had major effect on the separation of Eu(III)/La(III), and the co-transport of Eu(III)/La(III) was observed when the concentration of NO 3 − was 3 mol/L.
研究领域:
化学工程
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分离科学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2017
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IF 4.421
Panpan Zhao,Fan Yang,Zhigang Zhao,Qiuxiao Liao,Yang Zhang,Peng Chen,Wanghuan Guo,Ruixi Bai
For the first time, our group has developed a novel, high-flux strategy for shape-controlled synthesis of rare earth nano-materials (CePO 4 ) using ionic liquid(IL)-driven supported liquid membrane (HVHP, DUPAPORE ® ) system. The system contains three phases including a supply phase of rare earth ions, a feed phase of phosphates, and ionic liquid-driven supporting liquid membrane phase. The imidazolium IL-driven supported liquid membrane is promising for nano-synthetic reaction of CePO 4 . The anion types of immersed imidazolium IL have a critical role in the formation rate of CePO 4 nano-materials. Moreover, the adding SO 4 2− anion or adjustment of pH in supply phase containing Ce(III) ions could control effectively the morphology of the CePO 4 nano-materials. The result can be regarded as a good example, the IL:[C 4 mim][Tf 2 N] −driven support liquid membrane systems can be used to prepare nano-wire and nano-sphere structures of CePO 4 with high efficiency and flux. Besides, the IL-driven supported liquid membrane can be cycled many times by using the back flush activation method.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2022
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IF 4.331
Yijun Feng,Guohua Liu,Jinliang Xu,Kaiying Wang,Wenbin Mao,Guansheng Yao
Particle separation from fluid interfaces is one of the major challenges due to the large capillary energy associated with particle adsorption. Previous approaches rely on physicochemical modification or tuning the electrostatic action. Here, we show experimentally that particle separation can be achieved by fast dynamics of drop impact on soap films. When a droplet wrapped with particles (liquid marble) collides with a soap film, it undergoes bouncing and coalescence, stripping and viscous separation, or tunneling through the film. Despite the violence of splashing events, the process robustly yields the stripping in a tunable range. This viscous separation is supported by the transfer front of dynamic contact among the film, particle crust, and drop and can be well controlled in a deterministic manner by selectable impact parameters. By extensive experiments, together with thermodynamic analysis, we disclose that the separation thresholds depend on the energy competition between the kinetic energy, the increased surface energy, and the viscous dissipation. The mechanical cracking of the particle crust arises from the complex coupling between interfacial stress and viscous forces. This study is of potential benefit in soft matter research and also permits the study of a drop with colloid and surface chemistry.
研究领域:
软物质研究
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表面化学
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流体力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2020
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IF 1.718
Haitao Zhou,Xiuli Zhang,Tianran Lv,Qingjie Guo,Lingyun Wang
The transport of Ga(III) from chloride solution by supported liquid membrane (SLM) using organophosphorus acids as carriers was studied and compared with solvent extraction results. The diffusion coefficient, permeability coefficient and mass transfer resistance for both processes were analyzed by investigating various parameters, such as flow pattern, flow rate, pH, Ga(III)/extractant concentration and temperature. Under optimized conditions, the extraction percentage of 97.0% and permeability coefficient of 9.22 × 10−6 m/s was achieved for SLM process. Kinetic modeling was proposed to determine the mass diffusion coefficient of Ga(III) complex across the membrane and stability of this SLM system was also examined.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CLAY MINERALS
·
2024
·
IF 1.1
Qihui Wang,Xiaoli Liu,Chao Jiang,Xingpeng Wang,Linlin Wu,Huiyu Li,Weiliang Tian,Yongjun Feng
Palygorskite (Pal) shows great potential for physical, chemical and biological uses due to its colloidal, catalytic and adsorption properties. Pal mines, however, are facing the challenge of low-grade materials (5–15%), making it difficult to use Pal in emerging fields such as new materials, environmental protection and health. Therefore, there is an urgent need to develop an efficient method for separating and purifying Pal to obtain high purity levels. Hence, we have developed a dispersant-assisted rotating liquid film reactor separation strategy based on sodium hexametaphosphate as the dispersant. This strategy utilizes the double electron layer of Pal and the density difference between impurities to achieve effective disaggregation and purification of Pal bundles through the promotion of repulsive driving effects. Under optimal conditions, the purity of Pal can be increased from less than 10% to over 80%. This research presents a novel approach to the efficient refining of low-grade Pal. The crudely purified Pal’s adsorption capacity for methylene blue increased from 84.2 to 256.4 mg g–1.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Wanying Zhou,Huiting Liang,He Xu
In recent years, waste mobile phones have become popular as electronic waste due to the huge amount, serious pollution with improper disposal and high resource value. It is imperative to realize the recycling of resources in waste mobile phones. The application of emulsion liquid membrane in the recovery of gold and synthesis of nanomaterials from waste mobile phone printed circuit boards (WMPCBs) was studied. The components of the emulsion liquid membrane, effects of 7 factors on the extraction rate and the morphology of the synthesized nanomaterials were explored. The results show that it is possible to extract 99.79% of Au(III) from WMPCBs leachate with kerosene as diluent, Span80 as surfactant, methyl isobutyl ketone(MIBK) as carrier, ascorbic acid solution as stripping agent and liquid paraffin as membrane stabilizer. The external phase pH and the internal phase concentration had a greater influence on the extraction efficiency of Au(III) among 7 factors. The morphology of the synthesized product was affected by the concentration and type of the surfactant. It provides a new idea to connect recovery from waste with deep processing, extending the waste mobile phone recycling process chain and achieving high-value utilization of waste mobile phone secondary metal resource products.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Lelin Zeng,Qian Liu,Li Luo,Lian Liu,Kewen Tang
Liquid membrane (LM) separation is a kinetic process that can be enhanced by increasing the difference between the permeation rates of the components. The addition of H 3 Cit/Na 3 Cit as a selective permeation retardant can enlarge the difference between the permeation rates of Cu(II) and Cd(II) ions when P507 was used as the extractant. This retardant is analogous to a masking agent employed in liquid–liquid extraction (LLE). However, the retardant mainly affects the LM’s kinetics, while the masking agent impacts the LLE's equilibrium. It was found that the separation coefficient of the H 3 Cit/Na 3 Cit LM system could be much greater than that of the H 3 Cit/Na 3 Cit LLE system owing to the LM's kinetic effect. Following the addition of H 3 Cit/Na 3 Cit, the Cu(II) ion permeation rate was selectively retarded, and the LM selectivity of Cd(II)/Cu(II) was significantly enhanced in comparison with a control LM system. To reveal this enhancement mechanism, a new LM kinetic model was established in which the interfacial chemical reactions and mass transfer resistance in the middle connection zone of a H-type device were considered. The model's predictions agreed well with the experimental data. According to the model' quantitative analysis, the retardant affected the apparent reaction rate constants of Cd(II) and Cu(II) ions differently, and this is key to the enhancement mechanism. Aside from concentration, the LM model also predicted the variations in separation coefficient, purity, and yield with time. An optimal LM extraction time zone was defined to obtain high yield and high purity simultaneously. Finally, the enhanced LM was further verified and applied on a preliminary basis in a supported liquid membrane with strip dispersion, which is a LM technology with potential for industrial application.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
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IF 8.8
Zhikun Yang,Mingrui Li,Yanxiao Li,Xin Wang,Zhihua Li,Jiyong Shi,Xiaowei Huang,Xiaodong Zhai,Xiaobo Zou,Yunyun Gong,Melvin Holmes,Megan Povey,Jianbo Xiao
The gelatin/gellan gum based-bilayer emulsion film was developed in this work to improve the survivability of Bifidobacterium longum during the storage process. The baobab seed oil (BO) was added to the gelatin (GE) matrix to develop emulsion film as the barrier outer layer. The blueberry anthocyanin extract (BE) was incorporated into the gellan gum (GG)-based inner layer to enhance the viability of B. longum . The SEM and FTIR results revealed that the probiotics were successfully entrapped in BO/BE-loaded bilayer film. The greatest survivability and viable cell numbers of the B. longum during the storage period were observed in the BO/BE loaded bilayer film. Furthermore, the stability of the colorful patterns by electrochemical writing was also evaluated in this work. Finally, the GE/BO-GG/BE/BM maintain satisfactory probiotic viability in steamed bread coating application. Hence, the GE/BO-GG/BE/BM bilayer film could be considered a novel material to deliver and protect the probiotics in food applications.
研究领域:
食品科学
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生物技术
✓ 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）