Separations
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2022
·Vol. 9
·期 4
·92
·
IF 3.344
Mingming Wang,Feiyun Sun,Haojie Zeng,Xiaoli Su,Guofei Zhou,Hao Liu,Dingyu Xing
Catalytic membranes, as a combination of heterogeneous advanced oxidation and membrane technology reaction systems, have important application prospects in the treatment of dyes and other organics. In practical applications, it is still challenging to construct catalytic membranes with excellent removal efficiency and fouling mitigation. Herein, molybdenum disulfide-iron oxyhydroxide (MoS2-FeOOH) was fabricated using iron oxide and MoS2nanoflakes, which were synthesized by the hydrothermal method. Furthermore, by changing the concentration of MoS2-FeOOH, the MoS2-FeOOH/polyethersulfone (PES) composite ultrafiltration membrane was obtained with improved hydrophilicity, permeability, and antifouling capacity. The pure water flux of the composite membrane reached 385.3 L/(m2·h), which was 1.7 times that of the blank PES membrane. Compared with the blank membrane, with the increase of MoS2-FeOOH content, the MoS2-FeOOH/PES composite membranes had better adsorption capacity and catalytic performance, and the membrane with 3.0% MoS2-FeOOH content (M4) could be achieved at a 60.2% methylene blue (MB) degradation rate. In addition, the membrane flux recovery ratio (FRR) of the composite membrane also increased from 25.6% of blank PES membrane (M0) to more than 70% after two cycles of bovine serum albumin (BSA) filtration and hydraulic cleaning. The membrane with 2.25% MoS2-FeOOH content (M3) had the best antifouling performance, with the largestFRRand the smallest irreversible ratio (Rir). Catalytic self-cleaning of the composite membrane M3 recovered 95% of the initial flux with 0.1 mol/L H2O2cleaning. The MoS2-FeOOH/PES composite membranes with the functions of excellent rejection and antifouling capacity have a good prospect in the treatment of printing and dyeing wastewater composed of soluble dyes.Keywords:catalytic self-cleaning membrane;antifouling;MoS2;Fenton-like reaction
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 3
·2100787
·
IF 4.402
Dawei Dong,Minghua Zhang,Yafei Xiao,Zhaojie Yang,Ke Wang,Minmin Fan
Anion exchange membrane (AEM) is essential for the development of alkaline anion exchange membrane fuel cells, and its performance largely depends on its internal microstructure. Herein, to improve the performance of AEM, quaternized branched polyethyleneimine modified nitrogen-doped graphene quantum dots (QBPEI@N-GQDs) are introduced to quaternized polysulfone (QPSU) polymer matrix to prepare a series of QPSU/QBPEI@N-GQDs (QQ-n-N-GQDs) composite AEMs. Due to the uniform distribution of hydrophilic QBPEI@N-GQDs, an obvious hydrophilic/hydrophobic microphase separation structure is formed inside the QQ-n-N-GQDs composite AEMs. Compared with the pristine QPSU AEM, the QQ-0.7%-N-GQDs AEM shows slightly higher water uptake (WU) and swelling ratio (SR), as well as much higher ionic conductivity (76.18 mS cm −1 at 80 °C for QQ-0.7%-N-GQDs AEM versus 46.14 mS cm −1 at 80 °C for pristine QPSU AEM) and better maximum power density of single fuel cell (85.2 mW cm −2 for QQ-0.7%-N-GQDs AEM versus 46.3 mW cm −2 for QPSU AEM). Moreover, the chemical stability of QQ-n-N-GQDs composite AEMs has not been significantly adversely affected by the introduction of QBPEI@N-GQDs.
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ACS ES&T Water
·
2023
·
IF 5.3
Yansu Lan,Yicheng Huang,Die Zhou,Xi Zhang,Lei Xia,Raf Dewil,Bart Van der Bruggen,Yan Zhao
Carboxylates, which are considered high-value platform chemicals, are by-products produced during the fermentation of organic waste. There is a major challenge in effectively separating and recovering carboxylates from the fermentation broth. Electrodialysis (ED) has been considered a promising technology with its high selectivity in the absence of chemical additives. Here, a class of internally cross-linked anion exchange membranes (referred to as QPSF-n AEMs) were synthesized by using chloromethylated polysulfone (CMPSF) and varying amounts of 1,4-diazabicyclo [2.2.2] octane through quaternization and cross-linking reactions to recover carboxylates. The resulting membrane (QPSF-0.88) showed a high anion exchange capacity of 2.79 mmol g–1 but a low water content of 3.3% and an excellent swelling rate of 13.9%. To evaluate the separation efficiency of carboxylates, the membrane was tested with single solutions of acetate, oxalate, and citrate in 15.0 V (constant voltage) ED for 180 min. The removal efficiencies of QPSF-0.88 for acetate, oxalate, and citrate were 92.6, 87.9, and 85.9%, respectively, indicating a monocarboxylate selectivity for QPSF-0.88. After immersion in acidic or basic solutions, the change in the ion exchange capacity of QPSF-0.88 is less than 2%, indicating a high resistance to pH changes. This study presents innovative concepts in developing a membrane for the desalination of carboxylate.
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Engineering
·
2021
·
IF 7.553
Chao Wang,Jing Zhao,Liu Liu,Peng Zhang,Xianfeng Wang,Jianyong Yu,Bin Ding
There is a great demand for transparent films, membranes, or substrates in the fields of intelligent wearables, electronic skins, air filtration, and tissue engineering. Traditional materials such as glass and plastics cannot satisfy these requirements because of the lack of interconnected pores, undesirable porosity, and flexibility. Electrospun fibrous membranes offset these shortcomings because they contain small pores and have high porosity as well as outstanding flexibility. Thus, the development of transparent electrospun fibrous membranes is of great value. This work reports a simple and effective way to develop flexible and porous transparent fibrous membranes (TFMs) directly from electrospun fibrous membranes via mechanical pressing, without employing any other additives. In addition, the relationship between the transparency performance and the molecular structure of the polymers after pressing was summarized for the first time. After mechanical pressing, the membranes maintained fibrous morphology, micron-sized pores, and desired porosity. Polystyrene fibrous membranes, which exhibited excellent optical and mechanical properties, were used as a reference. The TFMs possessed high transparency (~89% visible light transmittance at 550 nm), high porosity (10%–30%), and strong mechanical tensile strength (~148 MPa), nearly 78 times that of the pristine electrospun fibrous membranes. Moreover, this study demonstrated that transparent and conductive membranes can be fabricated based on TFMs using vacuum-assisted filtration of silver nanowires followed by mechanical pressing. Compared with indium tin oxide films, conductive TFMs exhibited good electrical conductivities (9 Ω per square (Ω·sq −1 ), 78% transmittance at 550 nm) and notable mechanical performance (to bear abundant bending stresses).
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Qi Cheng,Ligang Lin,Xuesong Deng,Tiantian Zheng,Qi Wang,Yixin Gao,Xiaofei Zhai,Jing Yang,Wensong Ma,Xinyang Li,Yuzhong Zhang
A large-scale and low-cost method for producing highly ordered honeycomb-patterned film using commonly commercialized polymers was proposed. This method provides the ability to prepare honeycomb-patterned films in normal indoor environments without the need to maintain a certain relative humidity and without the addition of stabilizers. This method can produce a uniform and highly ordered honeycomb structure in semiclosed substrates in areas with limited humidity and limited curvature. At the same time, it can be used for large surfaces and on objects of different shapes. The pore size could be controlled by choosing an optimal solvent–nonsolvent ratio and modulating the experimental processing conditions. A film with thickness of 800 μm, prepared using 5 wt % PS in CH2Cl2 with 1 wt % propylene glycol, showed a highly ordered honeycomb pattern and hence proved to be the most suitable formulation for manufacturing PS honeycomb-patterned films. This approach can be applied to manufacture honeycomb-patterned film on a large scale with significantly improved hydrophobic properties. The integration of low-cost and large-scale fabrication of ordered honeycomb-patterned film has widespread application potential for future commercial technology equipment that needs certain functions.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2020
·
IF 3.35
Zhengzhong Zhou,Dan Li,Qigang Wu,Tao Zheng,Haoran Yuan,Na Peng
A facilitated-transport enantio-separation mechanism was proposed in this study and verified with an enantio-selective thin film composite membrane. The polysulfone membrane substrate was first fabricated at the optimized conditions, and the chiral selector α-CD was then incorporated into the selective layer by mixing with the MPD monomer for interfacial polymerization. Racemic tryptophan was employed as the model selectant, and inversed enantio-selectivities, 1.55 and 0.6 were observed from two different operation mode driven by concentration gradient and pressure gradient, respectively. The facilitated-transport separation mechanism was demonstrated by the concentration driven mode. The effects of other influencing factors including racemic feed concentration, α-CD concentration and pressure were also investigated.
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ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Huimin Wu,Zhen Ma,Chenjie Wei,Min Jiang,Xiao Hong,Yang Li,Dajing Chen,Xiaojun Huang
The novel 3D microfluidic concept of “lab-on-hollow fiber membrane (HFM)” was presented for multifunctional and rapid biological assays, integrating sample size sieving and colorimetric quantification in an HFM. Herein, microporous HFMs with a gradient pore size and high hydrophilic flux were used as microfluidic device substrates. The membrane pores selectively trapped macromolecules within the inner surface, while allowing free diffusion of smaller molecules, including glucose and protein. The microfluidic flow rate in HFM closely followed the Lucas–Washburn and Laplace’s models, indicating that the microfluidics facilitated the upward flow of the fluid by microcapillary action without external pumping. Subsequently, for sensing of different biomolecules, a highly sensitive fluorescent or optical chromogenic reagent was immobilized in HFM by an electrostatic interaction. Pyronin G fluorescence reagent was quenched by blood glucose, and the quenching efficiency showed a good linear correlation with glucose concentration (1–22 mM, R2 = 0.997). Moreover, this sensing platform was then further applied for the analysis of urine protein or glucose in the visible spectrum, with a wide testing range. Compared to traditional 2D flat membrane devices, this 3D-HFM microfluidic device exhibited excellent sensing versatility and color rendering uniformity with enhanced sensitivity. Target molecules screening, conditioning, enzymatic recognition, and signal readout of biomolecules have all been implemented on this device, which has paved the way to highly sensitive assays on point-of-care testing (POCT).
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PubMed
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POLYMER
·
2024
·
IF 4.1
Wenting Lan,Yafei Xiao,Minghua Zhang,Ya Cao,Minmin Fan
To investigate nanoparticle morphology's impact on the performance of composite anion exchange membrane (AEM), one-dimensional quaternized branched polyethyleneimine @multi-walled carbon nanotubes (QBPEI@MWCNTs) and two-dimensional quaternized branched polyethyleneimine @graphene oxide sheets (QBPEI@GO) were prepared and incorporated into quaternized polysulfone (QPSF) matrices to form QQ-x-MWCNTs and QQ-x-GO AEMs. These AEMs exhibited superior mechanical properties due to the flexible QBPEI cross-linking and nanoparticle reinforcement. Moreover, QBPEI facilitated microphase separation and ion cluster formation along the surface of nanoparticles, enhancing OH − transport. As a result, QQ-1.0%-MWCNTs and QQ-0.7%-GO AEMs both showed high ionic conductivity (83.19 mS/cm and 76.14 mS/cm at 80 °C). QQ-x-MWCNTs AEMs displayed higher conductivity than QQ-x-GO AEMs over the entire temperature range (20–80 °C) at the same level of ion exchange capacity. QQ-0.7%-MWCNTs AEM excelled, achieving a peak power density of 102.44 mW/cm 2 in an H 2 /O 2 fuel cell (80 °C, 40 % RH), surpassing QQ-0.5%-GO AEM (86.50 mW/cm 2 ). Evidently, one-dimensional MWCNTs are effective for establishing long-range interconnected ion transport channels, making them excellent AEM fillers.
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Green Energy & Environment
·
2024
·
IF 10.7
Chao Jiang,Xiaoli Liu,Xingpeng Wang,Qihui Wang,Huiyu Li,Weiliang Tian,Saeed Ahmed,Yongjun Feng
Coupling adsorption and in-situ Fenton-like oxidation process was developed for Methylene blue (MB) using refined iron-containing low-grade attapulgite (ATP) clay, and the removal mechanism was investigated. The MB was initially adsorbed on the porous ATPs, and then the enriched MB was removed by the H 2 O 2 -assisted Fenton-like oxidation with the iron-containing ATP catalyst. Under optimal conditions, the ATP powder exhibits the maximum removal efficiency of 100% with negligible iron leaching (1.5 mg L -1 ) and no sludge formation. Furthermore, polysulfone/ATP (PSF/ATP) pellets were fabricated through a water-induced phase separation process to construct a fixed-bed reactor (FBR) for continuous contaminant removal. For the first cycle, the maximum adsorption capacity was 15.5 L with an outlet MB concentration of 1.973 mg L -1 (˂ 2 mg L -1 , GB4287-2012) using the PSF/ATP pellets containing 50.0 g of ATP powders, and the maximum Fenton-like oxidation capacity was 35.5 L with the outlet concentration of 0.831 mg L -1 . After five cycles, the total treated volume of the MB solution was ca. 255 L, and the efficiency remained above 99%. After 10 hours of continuous treatment towards practical resin industrial wastewater, the chemical oxygen demand (COD) removal efficiency was still measured at 83.05%, costing 0.398 $ m -3 . These results demonstrate the practical applicability of iron-containing low-grade ATP clay for textile water treatment.
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SOLID STATE IONICS
·
2024
·
IF 3
Tianxin Zhao,Lulu Wang,Yang Zhang,Fan Zhang,Jilin Wang
A series of anion exchange membranes (AEMs) with highly ion conductivity suitable for practical application in fuel cells were prepared in this paper. Polysulfone (PSf) was used as backbone to prepare chloromethylation polysulfone (CMPSf). Then the synthesized CMPSf was blended with tetramethyldiaminopropane (TMPDA) and polyethylene glycol (PEG 400), to construct interpenetrating polymer networks with hydrogen-bonding conduction sites. In this paper the chemical structure of the AEM is confirmed by nuclear magnetic resonance spectrum ( 1 H NMR) spectroscopy and fourier transform infrared spectroscopy (FT-IR). The morphologies of synthesized membranes in this paper are investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The electrochemical and physical properties of AEMs are tested comprising water uptake (WU), ion exchange capacity (IEC), alkaline stability, thermal stability and mechanical stability. The introduction of hydrogen-bonding networks enhanced the OH − conductivity of the membranes (from 37.03 mS·cm −1 of QAPSf-PEG 0% to 104.67 mS·cm −1 of QAPSf-PEG 30% ). The interpenetrating polymer networks make the membranes have good mechanical property (tensile strengh is 19.61 MPa, elongation at break is 20.30 %) and anti-swelling properties (29.3 %, 80 °C). Due to the introduction of hydrogen-bonding conduction networks, the alkaline stability of the AEMs can be enhanced by reducing the modification of the polysulfone backbone. Thus, even after soaking in 6 mol·L −1 KOH solution for 30 days, the retained OH − conductivity of QAPSf-PEG 3 0% still reached 92.0 %. At the same time, the addition of PEG leads to the increased water uptake, so that the OH − ions could be better transported. And the single cell performance of QAPSf-PEG 30% was also revealed that the power density increases significantly from 323.35 mW·cm −2 at 60 °C to 514.8 mW·cm −2 at 80 °C as the temperature increases. Overall, QAPSf-PEG 30% exhibits promising development potential in the fuel cells.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yufan Mo,Chunxia Che,Wei Han,Feiran Chen,Jun Guan,Feng Zhang,Bo Yang,Xiangdong Ren,Huiyu Li,Saeed Ahmed,Yongjun Feng
Fenton degradation is a reliable treatment technology for mitigating environmental pollution. In the development of heterogeneous Fenton catalysts, improving the catalytic reactivity and long-term stability is of great significance for sustained industrial applications. In this work, spherical-shaped porous alumina supports (γ-Al 2 O 3 ) are prepared via polysulfone-assisted water column forming method. A simple impregnation method is utilized to prepare Fe 2 O 3 /γ-Al 2 O 3 catalysts, aimed at improving the dispersibility of active Fe components to boost catalytic activity. To prevent the detachment of Fe and enhance the catalyst’s long-term stability, glucose is employed as a carbon source to carbonize and coat the catalyst surface. This treatment leads to the formation of active Fe 2+ components through reduction and the final Fe-Fe 3 O 4 /γ-Al 2 O 3 @C catalysts. With the Fe-Fe 3 O 4 /γ-Al 2 O 3 @C-1 catalyst, the degradation of 10 ppm of ciprofloxacin antibiotic achieves a remarkable removal rate of 98.7 %. Notably, after 240 h of cyclic degradation, a high removal rate of 87.9 % is maintained, which is attributed to the protective properties of the carbon coating against the detachment of active iron components. This research highlights the potential of the developed catalyst for the effective and sustainable degradation of pollutants, particularly suitable for industrial applications.
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RSC Advances
·
2024
·Vol. 14
·期 30
·21307-21317
·
IF 3.9
Tian Xie,Han Qu,Chao Zhang,Zheng Li
Lithium extraction from salt lake brine is still challenging due to the existence of similar elements, e.g. sodium. In the present work, polysulfone (PSF) microcapsules containing 1-phenylazo-2-naphthol (HS) and trioctylphosphine oxide (TOPO) as extractants were successfully prepared by microfluidic technology for the separation of Li+ from brine with Li+ and Na+. The morphology, composition, and structure of HS-TOPO-based microcapsules were characterized systematically. The results showed that microcapsules consisting of 20 wt% (m m−1) polysulfone and 80 wt% (m m−1) 1-phenylazo-2-naphthol-trioctylphosphine oxide as the extractant, which was labeled as PSF/HS-TOPO-2/8, exhibited the best performance for Li+ adsorption. The separation factor (SF) of Li+ over Na+ is up to 653 and the adsorption capacity for Li+ in the simulated brine could reach 3.67 mg g−1 for microcapsules PSF/HS-TOPO-2/8, which demonstrated that Li+ can be separated with high selectivity. Besides, the kinetic results demonstrated that the adsorption followed quasi-secondary adsorption kinetic models, indicating that the adsorption mechanism of lithium by microcapsules involved chemisorption. After ten cycles of adsorption–elution, the maximum equilibrium adsorption capacity still remained at 87%. All these results demonstrate that PSF/HS-TOPO-2/8 microcapsules can be used as an efficient adsorber for the adsorption of Li+ from brine with high selectivity and stability.
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