SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Yi-Fang Mi,Yi-Han Huang,Shu-Heng He,Rong Ma,Yi-Ding Meng,Zhi-Hai Cao
Designing nanofiltration (NF) membranes with tunable pore sizes and surface charges is highly desirable to meet the growing demand for precise separation. In this study, carbon quantum dots generated through lysine pyrolysis ( l -CQDs) were utilized as monomers to fabricate NF membranes via interfacial polymerization (IP). Intriguingly, the surface charge (from negative to positive) and effective pore size (from loose to dense structure) of the resultant NF membranes could be simultaneously modulated by simply adjusting the diffusion of l -CQDs during the IP process, which endowed the obtained l -CQD-based NF membrane with a tunable separation performance. The negative and loose NF membranes ( l -CQD; 0.1 wt%) achieved excellent dye/salt fractionation performance even at high NaCl concentrations (20 g/L). The recovered NaCl from the highly saline dyeing effluent could be directly reused in cotton fabric dyeing, indicating potential application prospects in the treatment of saline textile effluents. A dense and positive NF membrane was obtained when l -CQD concentration increased to 1.0 wt%; this membrane showed exceptional desalination performance with high rejection of MgCl 2 , CuCl 2 , and CaCl 2 (98.77 %, 99.06 %, and 99.0 %, respectively), demonstrating the ability to remove metal ions from water. This work provides an approach for preparing NF membranes with tailorable pore size and surface charge and highlights the potential of l -CQD-based NF membranes for the practical separation toward various charged components.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Fangmeng Sheng,Xingya Li,Yuanyuan Li,Noor Ul Afsar,Zhang Zhao,Liang Ge,Tongwen Xu
Wastewater containing organic dyes and high content of salts has posed a serious challenge on global water security. Herein, a cationic nanoporous covalent organic framework (COF) membrane is constructed via a facile interfacial growth strategy. The prepared membranes show excellent dye/salt separation performance with a pure water flux above 24 L m −2 h −1 bar −1 . The rejection rate of methylene blue of positive charges is above 99%, while the rejection rates of NaCl, Na 2 SO 4 , MgSO 4 are only 3.2%, 2.6%, and 9.4%, respectively. The high rejection of methylene blue is mainly governed by the electrostatic repulsion between cationic COF channels and the positively charged dye. Moreover, the size sieving effect dominates the rejection of dyes with larger molecular sizes than that of the COF channel. These findings provide strategies for developing various nanoporous COF membranes for efficient dye/salt separation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Fan Xiao,Ming Cao,Rongrong Chu,Xiaoyu Hu,Wenxiong Shi,Yingbo Chen
A new type of composite membrane was prepared through the vacuum filtration self-assembly, in which, graphene oxide (GO) was the basic material, and the horizontal insertion material is product of perylene-3, 4, 9, 10-tetracarboxylic dianhydride (PTCDA) and UiO-66-NH 2 (PTCDA-UiO-66-NH 2 ). The leading role of Π-Π conjugate, auxiliary effect of hydrogen bonding during membrane preparation have been confirmed through Fourier transform infrared spectroscopy (FTIR), UV–visible spectrophotometer, Raman spectroscopy, and X-ray diffraction (XRD). The prepared GO@PTCDA-UiO-66-NH 2 membrane had new nodular structure compared to GO membrane by scanning electron microscopy (SEM) and atomic force microscopy (AFM), which promoted the water transport. In addition, the insertion of PTCDA-UiO-66-NH 2 narrowed the actual filtration spacing between GO sheets, and PTCDA-UiO-66-NH 2 could also adsorbed dye laterally. Experiments showed that the permeance of GO@PTCDA-UiO-66-NH 2 membrane was 1.7 times of GO membrane, and the removal of methyl blue, congo red, crystal violet and disperse black 9 was close to 100%. Under extreme pH, high salt concentration and multiple recycling, its separation ability was still excellent. The GO@PTCDA-UiO-66-NH 2 membrane constituted a unique synergistic structure of vertical-screening and horizontal-adsorption, which successfully overcame the trade-off effect and obtained excellent stability of structure and performance. Therefore, GO@PTCDA-UiO-66-NH 2 membrane had great potential in practical applications.
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高影响因子
Nanomaterials
·
2021
·Vol. 12
·期 1
·41
·
IF 5.076
Tong Yu,Chenpu Wu,Zhongyan Chen,Mingen Zhang,Zhuan Hong,Honghui Guo,Wenyao Shao,Quanling Xie
In this study, a novel photocatalytic self-cleaning nanofiltration (NF) membrane was fabricated by constructing aspartic acid-functionalized graphene quantum dots (AGQDs) into the polydopamine/polyethyleneimine (PDA/PEI) selective layer via the co-deposition method. The chemical composition, microstructure, and hydrophilicity of the prepared membranes were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), attenuated total reflection (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and water contact angle (WCA). Meanwhile, the effects of PEI molecular weight and AGQDs concentration on NF membrane structures and separation performance were systematically investigated. The photocatalytic self-cleaning performance of the PDA/PEI/AGQDs membrane was evaluated in terms of flux recovery rate. For constructing high-performance NF membranes, it is found that the optimal molecular weight of PEI is 10,000 Da, and the optimal concentration of AGQDs is 2000 ppm. The introduction of hydrophilic AGQDs formed a more hydrophilic and dense selective layer during the co-deposition process. Compared with the PDA/PEI membrane, the engineered PDA/PEI/AGQDs NF membrane has enhanced water flux (55.5 LMH·bar−1) and higher rejection (99.7 ± 0.3% for MB). In addition, the PDA/PEI/AGQDs membrane exhibits better photocatalytic self-cleaning performance over the PDA/PEI membrane (83% vs. 69%). Therefore, this study provides a facile approach to construct a self-cleaning NF membrane.Keywords:nanofiltration;graphene quantum dots;L-aspartic acid;self-cleaning;co-deposition
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高影响因子
WATER RESEARCH
·
2021
·
IF 11.236
Chenying Zhou,Peng Zhou,Minglu Sun,Yang Liu,Heng Zhang,Zhaokun Xiong,Juan Liang,Xiaoguang Duan,Bo Lai
The sluggish kinetics of Fe(II) recovery strongly impedes the scientific progress of Fenton reaction (Fe(II)/H 2 O 2 ) towards practical application. Here, we propose a novel mechanism that metal-free nitrogen-doped carbon nanotubes (NCNT) can enhance Fenton chemistry with H 2 O 2 as electron donors by elevating the oxidation potential of Fe(III). NCNT remarkably promotes the circulation of Fe(III)/Fe(II) to produce hydroxyl radical ( • OH) with excellent stability for multiple usages (more than 10 cycles) in the NCNT/Fe(III)/H 2 O 2 system. Although carbonyl on NCNT can act as the electron supplier for Fe(III) reduction, the behavior of NCNT is distinct from common reductants such as hydroxylamine and boron. Electrochemical analysis and density functional theory calculation unveil that nitrogen sites of NCNT can weakly bind with Fe(III) to elevate the oxidation potential of Fe(III) (named near-free Fe(III), primarily FeOH 2+ ) at pH ranging from 2.0 to 4.0. Without inputs of external stimulations or electron sacrificers, near-free Fe(III) can promote H 2 O 2 induced reduction of Fe(III) to initiate Fenton chain reactions for long-lasting generation of • OH. To our delight, it is a common property of N-doped carbon materials (e.g., graphene, carbon nanofibers, and acetylene black), our research thus provides a novel, sustainable, and green strategy for promoting Fenton chemistry.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuyang Zhou,Xiaochun Wu,Jin Zhang,Zhenxing Wang
Tannic acid (TA) − 3-aminopropyltriethoxysilane (APTES) coating (TA-APTES coating) composed of abundant nanospheres with secondary reaction sites has many distinct advantages for surface modification. Herein, an in-situ growth method is proposed to generate TA-APTES nanospheres on both the outer and inner surface of polypropylene (PP) membrane. Compared with previous reported TA-APTES nano spheres coating just on the outer surface of the membrane (named PP-Su-NPs), TA-APTES nano spheres on both outer and inner surfaces prepared with this method (named PP-En-NPs) exhibits much better functional performance after secondary reactions. As a proof of concept, the TA-APTES nanospheres is functionalized by tannic acid, polyethyleneimine (PEI) and Fe 3+ to carry positive charges for absorbing anionic dyes, and the dye adsorption performance of the PP-En-NPs after the secondary reactions is 7–8 times higher than that of PP-Su-NPs. Interestingly, the functionalized coating can not only absorb anionic dyes, but also cationic dyes, and selective desorption is also realized for this functionalized coating. The possible mechanism is revealed in this study. This study will accelerate the development of the TA-APTES coating, and make it become a powerful tool for membrane modification.
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Advanced Materials Interfaces
·
2021
·Vol. 9
·期 4
·2101602
·
IF 6.147
Haizhou Huang,Nan Wu,Hui Liu,Yide Dong,Longxiang Han,Shu Wan,Guangbin Dou,Litao Sun
Device–body interface is significant for acquiring high quality bio-signals, preventing skin-irritation, and minimizing the motion artifacts. However, low breathability of the typical substrate used in a flexible electronic device usually deteriorates the stability of device–body interface, which is imperative for long-term application but commonly disregarded. In paper, a directional sweat transport and breathable electrode with three-layer sandwiched structure is reported. The top hydrophilic hydrolyzed-polyacrylonitrile (HPAN) layer and middle hydrophobic thermoplastic-polyurethane (TPU) layer form Janus structure; and the bottom layer is an electrode layer of Ag nanowires (AgNWs). This dedicatedly designed electrode can transport sweat from skin to the top HPAN layer, while keeping low noise electrocardiogram (ECG) signal detection. In the trial of ECG monitoring, the results show that the electrode can achieve reliable recording with high signal noise rate (SNR) both in calm state (10.5 dB) and sweaty state (10.1 dB) with sweat tolerance. No allergy or obvious SNR degeneration is observed when utilizing the electrode owing to the effective sweat transport away from the device–body interface rather than accumulation. Finally, the application of the anti-sweat accumulating electrode in wearable electronics is demonstrated.
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Small
·
2021
·Vol. 18
·期 5
·2105198
·
IF 13.281
Xiangyi Zhang,Lipei Ren,Jie Xu,Bin Shang,Xin Liu,Weilin Xu
Structural design of the solar-absorbing layer has been considered as one of the most direct and effective approaches for improving the solar steam generation performance by maximizing the absorption of sunlight, but great challenges in manipulation simplification and structure controllability still remain. Herein, a polyester (PET) fabric covered with a vertically aligned 3D tower-like ferrosoferric oxide (Fe 3 O 4 ) array via a convenient magnetically driven spray-coating method is reported, and both the spatial density and height of the Fe 3 O 4 array are tunable upon spraying time. It shows an extremely high solar absorbance (98.6%) in the entire solar spectrum, which is superior to the corresponding 2D Fe 3 O 4 structure (91.1%). Combining the obtained 3D Fe 3 O 4 /PET with a yolk-shell hydrophobic/superhydrophilic modified melamine-formaldehyde (mMF) sponge, the carefully designed and fabricated 3D Fe 3 O 4 /PET-mMF evaporator can realize a high water evaporation rate of 1.59 kg m −2 h −1 under 1 kW m −2 solar illumination, outperforming most related solar steam generation systems. With the advantages of cost-effectiveness, high evaporation rate, reliable endurance, and structural controllability, this 3D structural design provides an avenue to build up high-performance solar energy-driven water steam generation systems.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yun Liu,Yue-Fei Zhang,Jian Tang,Yuting Tan,Hang Lei,Ying Li,Pengmian Huang,Yan Li
In this study, we developed a novel chitosan-based adsorbent with low cost, high adsorption capacity and marvelous reusability. The adsorbent was prepared in one pot by crosslinking chitosan with acrolein , which was the first attempt to use acrolein as a crosslinking agent to achieve chitosan-based hydrogel (A/CS hydrogel). The A/CS hydrogel not only had the high swelling ratio as many as approximately 1300 times the dry hydrogel, but also has excellent adsorption property for the anion dye acid blue 93 (AB93). Under the optimal adsorption conditions, the adsorption capacity of the adsorbent on AB93 reached up to 1839 mg/g, which realized the ultra-high adsorption capacity. After 12 times of adsorption-desorption cycle, the adsorption rate of the adsorbent to AB93 was still about 90%, which revealed marvelous stability and reusability. The purpose of the present study was to provide a new choice of the elimination and recycle of AB93 and have potential for industrial application.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Xiaoqin Niu,Kejian Chang,Wenduo Li,Haobin Hu
Polyethersulfone membrane is easy to be polluted, and the negative surface would help enhance improve the permeability and the anti-pollution performance; so how to anchor polymer brushes with negative groups to polyethersulfone membrane surface is a challenge. In this paper, polymer brushes of poly(2-acrylamide-2-methylpropanesulfonic acid sodium salt) is first grafted to carbon nanotubes to form an organic-inorganic hybrid additive, which is further anchored onto the membrane surface of polyethersulfone by blending method. The graft reaction is proceeded by surface initiated electrochemical atom transfer radical polymerization , where the introduction of electrochemical part is because it could help better control the growth of polymer brushes compared with the pristine atom transfer radical polymerization process. The carbon nanotubes grafted with poly(2-acrylamide-2-methylpropanesulfonic acid sodium salt) could anchor on the membrane surface because the there is a self-assemble process of organic-inorganic hybrid additive during phase inversion method, where the inorganic part carbon nanotubes firmly embedded into the membrane and the organic part can be fixed on membrane surface. The polyethersulfone membrane exhibits enhanced surface hydrophilicity , improved the permeability of the membrane, and good anti-fouling performance due to the negative charge and electrostatic repulsion brought by anionic surface of the modified membrane. When the mass of nanotubes grafted with poly(2-acrylamide-2-methylpropanesulfonic acid sodium salt) in the casting solution is 20 mg, the water flux can reach 365.5 L m −2 h −1 , and the rejection ratios of both BSA and CR are close to 100% with good flux recovery and anti-fouling effect performance.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Tianyue Zhang,Xuejiao Wang,Ying Dong,Jing Li,Xiao-Yu Yang
Separating water-in-oil emulsions is important in terms of environmental protection and resource recovery. To address the challenges posed by the water–oil interface, superwetting materials have been designed to accomplish separation through filtration and adsorption. Superhydrophobic membranes prevent the permeation of water droplets owing to extreme repellence and their size-sieving abilities. However, their use in remediating water-contaminated oil is limited by high oil viscosities. Meanwhile, in-air superhydrophilic sorbents are rarely employed for the separation of water-in-oil emulsions due to the thermodynamic and kinetic limitations of water adsorption in oil. Herein, the integration of an under-medium superlyophilic membrane with the hierarchical porous structure of wood is presented for filtration-driven selective adsorption of water from surfactant-stabilized (10 g/L) water-in-oil emulsions. Compared to filtration through a natural wood membrane or direct adsorption using an under-oil superhydrophilic wood membrane, the under-medium superlyophilic wood membrane demonstrated high separation efficiencies of > 99.95% even when applied to the regeneration of high-viscosity lubricating (6.3 mPa s) and edible (50.5 mPa s) oils, exhibiting viscosity-dependent fluxes and excellent stability. Moreover, the cost of purifying 200 mL of lubricating oil using the modified wood membrane was much lower than the oil’s market price and required a low energy consumption of ca. 1.72 kWh. Environmental implication The ever-growing use of petroleum and industrial/domestic oil products has led to excessive (estimated at a million tons per year) output of waste oils. Because direct discharge of waste oils into the environment causes serious pollution problems, separating water-in-oil emulsions is important in terms of environmental protection and resource recovery. Here filtration-driven water adsorption has been demonstrated to be a feasible method for the remediation of water-contaminated waste oils, even those that are highly viscous.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Ye Jiang,Lijun Du,Wenyuan Lang,Shuyu Liu,Bing Xue,Shuguang Yang
Novel thin-film-composite (TFC) nanofiltration (NF) membranes with polysulfone (PSF)/sulfonated polytrifluorostyrene (SPTFS) substrate and polyethyleneimine (PEI)/SPTFS selective layer were fabricated via the combination of phase inversion and stepwise interfacial complexation. As the increase in SPTFS additive during phase inversion, PSF/SPTFS substrates exhibited macrovoids cross-sectional structures, smaller water contact angle, lower surface zeta potential, and excellent water flux. The PEI/SPTFS selective layer was constructed through stepwise interfacial complexation. Attenuated total reflection flourier transformed infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) results verified the successful complexation of polyelectrolytes on PSF/SPTFS substrate. The water flux and selectivity experiments revealed that the TFC membrane with a single PEI/SPTFS bilayer (TFC-1) presented a desired pure water flux of 28.0 (L m −2 h −1 bar −1 ) and excellent dye rejections of MB, CR, AR66 above 98 %. Moreover, TFC-1 membrane demonstrated a ∼11-fold lower adsorption of bovine serum albumin (BSA, 5.8 µg cm −2 ) compared to the pristine PSF membrane, indicating a great static anti-pollution performance. This study provides a facile strategy to prepare fluoropolymer-modified NF membranes with high water flux, excellent dye rejection and low non-specific adsorption.
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