LANGMUIR
·
2023
·
IF 3.9
Zhecun Wang,Min Guan,Xiangpeng Jiang,Jinyue Xiao,Yubing Shao,Shenghai Li,Yaohan Chen
Porous membranes with under-liquid dual superlyophobic properties, which are difficult to achieve because of a thermodynamic contradiction, have attracted considerable interest in the field of switchable oil/water separation. Herein, a bioinspired mesh membrane with alternating hydrophilic and hydrophobic chemical patterns on its surface that endows it with superamphiphilic and under-liquid dual superlyophobic properties is fabricated by a simple liquidus modification process. The as-prepared membrane possesses a combination of under-oil superhydrophobic and under-water superoleophobic characteristics in the absence of external stimuli. Moreover, it can effectively perform the on-demand separation of various oil/water systems, including immiscible oil/water mixtures and oil/water emulsions owing to its under-liquid dual superlyophobic properties.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wenbin Jin,Jingjing Wang,Hai Wan,Yuan Liang,Shuohan Huang,Yuwei Chen,Peng Wei,Qun Shao,Yanping Wang,Yong He,Yumin Xia
With the rapid development of marine transportation, frequent oil leakage will inevitably occur. Therefore, oil–water separation had become an important research topic. The polyoxymethylene (POM) microfiber is a potential oil–water separation material with very good chemical stability, hydrophobicity, and lipophilicity, as well as unique microfiber recyclability and deformability. In this paper, the POM microfiber (PMF) was prepared using a method inspired by natural bamboo cellulose. PMF can be directly used for oil adsorption with a maximum of 19.5 times of oil adsorption capacity (OAC). The water contact angle (WCA) in oil of POM microfiber membrane (PMFM) can reach 160° and the oil–water separation efficiency was more than 99%. In addition, the recyclability allowed the PMF to repeatedly separate the oil–water mixture, and the deformability ensured that it can be used in various oil–water separation situations with different shapes. Moreover, only deionized water was used in the top-bottom preparation strategy of PMF without any chemical reagents. Therefore, this eco-friendly strategy had important implications for the preparation of microfiber materials.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Wanzheng Ren,Jian Pan,Wenqiang Gai,Xinyu Pan,Haimei Chen,Jiao Li,Lilan Huang
A crucial step in the purification and recycling of industrial waste oil is the separation and removal of trace water from emulsified oil. After optimizing the polymer content, solvent composition, and SiO 2 nanoparticle addition amount of the spinning precursor solution, a Polyvinylidene fluoride- co -trifluoroethylene chloride (PVDF-CTFE)/SiO 2 nanofibrous membrane with micro and nano-rough structure was prepared by electrospinning. Using scanning electron microscopy, a pore size analyzer, a contact angle tester, a single-fiber strength tester, and a gravity separation experiment, the influence of SiO 2 addition on the morphology, pore size distribution , wettability , mechanical, and separation properties of the modified membranes was characterized. The results demonstrated that the water contact angle of the nanofibrous membrane was increased to 151.3° of superhydrophobic when SiO 2 was added at a concentration of 2.5 wt%. The nanofibrous membranes exhibited outstanding separation performance (>99%) for water-in-oil mixtures and emulsions, as well as for various oil-water systems. Moreover, the PVDF-CTFE/SiO 2 nanofibrous membranes exhibited superior multi-cycle performance and consistent chemical resistance. This research yielded a novel material and a straightforward method for fabricating superhydrophobic nanofibrous membranes, which demonstrated greater application potential in oil-water separation.
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高影响因子
DESALINATION
·
2023
·
IF 9.9
Yuting Liu,Jiahao Mo,Huiying Ding,Yanjun Cheng,Zhong Zhang,Chen Wang,Xianhui Li
Loose nanofiltration membrane is regarded as an effective separation technology for dye purification and reuse, but is still restrained by the trade-off between the permeance and the dye/salts selectivity . Herein, we report the fabrication of an ultrafast loose polyamide nanofiltration (NF) membrane on the nanofibrous support layer with uniform in-situ grown ZnO nanoparticles . It was found that embedding ZnO nanoparticles provides more water channels and increased effective filtration area, thus enhancing the water permeation without trading off the dye/salt selectivity . The fabricated NF membrane with an in-situ formed ZnO-nanoparticle interlayer exhibits an ultrahigh water permeance up to 375 L m −2 h −1 bar −1 , which increased by approximate seven-fold than that of virgin NF membrane (54 L m −2 h −1 bar −1 ) without nanoparticles intercalated, and attains high rejection of organic dyes (>91 % for Congo red, >92 % for Methyl blue, and >98 % for Victoria blue B) but low rejection of inorganic salts (<5 %). The synergy of steric exclusion and charge effect dominate the high selectivity of dye and salts. This study unlocks a new avenue to synthesize ultrahighly permeable-selective loose NF membranes.
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高影响因子
DESALINATION
·
2022
·
IF 11.211
Xiumin Zhang,Yongping Dong,Qingyi Wang,Hang Yu,Congjie Gao,Lixin Xue
Structures and NF performance of TFC-Co and TFC membranes activated with 50 % alcohol solutions were studied. Methanol and glycol solution activation increased water flux 2–4 times without trading off salt rejection while glycerin solution activation increased water flux 3–4 times with reduced salt rejection and increased dye/salt retention selectivity . The Stokes radius of TFC-Co membrane changed from 0.77 nm to 0.66, 0.78 and 0.92 nm while the TFC membrane changed from 0.54 nm to 0.55, 0.65 and 0.70 nm after activation with methanol, glycol and glycerin solutions, respectively. Capillary pore filling models were developed from pure alcohol absorption experiments including the stages of initial pore filling, pore expansion, pore relaxation and pore adjustment, while most Stokes radius after 50 % solutions activation were found to be close to the relaxed pore radius values (r rx ) or half of the expanded pore radius values (r ex ) from pure alcohol absorption experiments.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jingxuan Zhao,Hongxu Liu,Yuchao Qi,Ruijia Wang,Ziwei Lv,Yang Yu,Shulin Sun
With the rapid development of industry, the problem of water pollution has become increasingly serious. Though there are many separation materials available to solve this problem, how to separate multiple wastewater at the same time remains a challenge. Hydrogel coating is suitable for use in the field of oil–water separation, and chitosan (CS) is effective in removing anionic dyes. Therefore, the preparation of separation membranes with hydrogel coating containing CS and dopamine (DA) can effectively separate oil–water emulsion and anionic dye wastewater. In this paper, DA@CNTs/CS hydrogel coating was prepared by sequentially coating Cu 2+ , DA@CNTs, Cu 2+ and CS on the surface of polyvinylidene fluoride (PVDF) membrane by deposition of self-assembly, which enhanced the hydrophilicity of the membrane and made it highly underwater oleophobic and antifouling. The alkali treated PVDF membrane contained a large amount of –OH, Cu 2+ , which formed coordination bonds with –OH, CS, and DA and the hydrogel coating could be stably loaded on the membrane. In addition, the introduction of rigid CNTs effectively improved the performance of the modified membrane under extreme conditions such as high pH and high salt concentration. PVDF-DA@CNTs/CS membrane had an ideal pure water flux (PWF) of 1470 (L·m −2 ·h −1 ) and the separation efficiency of 99.7 % for anionic dye and 99.4 % for oil–water emulsion. The contaminant on the membrane surface can be quickly removed by washing with DI water. The overall performance of the membrane is also maintained at a very high level of long-term filtration of wastewater. In summary, this study provides a new approach to complex wastewater treatment technology.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yanting Dou,Zhiman Liang,Zhenhe Xu,Yuanjin Wang,Jiqi Zheng,Dongling Ma,Yu Gao
Photocatalysis is considered a promising technology to alleviate the energy crisis and environmental pollution; however, developing photocatalysts with improved light absorption efficiency is still a challenge. In this work, an effective strategy was proposed to synthesize a highly functional ternary nanocomposite (g-C3N4/RGO/AZIS) by coupling broader light-absorbing Ag-doped ZnIn2S4 (AZIS) nanoplates with ultrathin g-C3N4 and reduced graphene oxide (RGO) nanosheets. The 2D-on-2D stacking nanostructure of the composite provides a compact heterojunction, enlarged interfaces, and enriched active sites, resulting in the accelerated separation and relocation kinetics of charge carriers. Benefiting from these advantages, the g-C3N4/RGO/AZIS nanocomposite with systematically optimized contents of RGO and AZIS can serve as an efficient bifunctional photocatalyst for both H2 production from water splitting and methyl orange (MO) photodegradation under the irradiation of visible light. The H2 production rate of the ternary nanocomposite is 658.5 μmol h–1 g–1, which is 38 times higher than that of plain g-C3N4. The operation mechanism is proposed based on the results of scavenger tests and photoelectrochemical analysis. The formation of a type-II heterostructure between AZIS nanoplates and g-C3N4 nanosheets along with RGO with lower potential can maximize the separation efficiency of photogenerated electron–hole pairs and decrease the charge recombination. This work provides a viable strategy to develop bifunctional photocatalysts with enhanced performance for both H2 production and degradation of organic dyes.
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高影响因子
LUMINESCENCE
·
2023
·Vol. 38
·期 9
·1552-1561
·
IF 2.9
Shujuan Yu,Shiyan Lu,Guangjian Zheng
The design and synthesis of water-insoluble chitosan-based polymer carbon dots [P(CS-g-CA)CDs] are described. A polyvinyl alcohol/chitosan-based polymer carbon dot [PVA/P(CS-g-CA)CDs] composite film was prepared using a simple casting method to be used in dye adsorption. The composite film was characterized using FT-IR, XPS, transparency, contact angle, and mechanical properties tests, which showed the successful incorporation of P(CS-g-CA)CDs into the film and also revealed that hydrogen bonding improved the mechanical properties of the PVA film. Furthermore, the composite film displayed substantially enhanced hydrophobicity, making it suitable for use in aqueous environments. In addition, the composite film exhibited stable adsorption of acid blue 93 (AB93) at pH 2–9, with an enhanced adsorption capacity of 433.24 mg/g. The adsorption obeyed Langmuir law with an efficiency of more than 89% even after five cycles. Therefore, the PVA/P(CS-g-CA)CDs film is a promising material for the treatment of organic dye-polluted wastewater.
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高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Yuanjing Ding,Junkai Gao,Zhongzhi Chen,Qian He,Mengsheng Xia,Pengtao Xu,Yan Cao,Yan Chen
Based on the durability of fibroin and the biocompatibility of sericin, researchers are exploring ways to maximize their advantages by combining them in the biomedical field . Fortunately, silk cocoon shell (SC) offers a natural composite material of fibroin and sericin. However, the inherent hydrophobicity of SC, the random arrangement connection of fibers, and the protection provided by the outer sericin limit its application in purifying oil wastewater. In this work, a cost-effective method was developed to improve the hydrophilicity of SC and the mechanical properties of SC by utilizing obsoleted SC as a matrix as well as by dissolving portions of sericin proteins. The polydopamine particle (PDP) was utilized as the intermediate modification layer and a supramolecular gel (SMG) was introduced to the surface of SC, further improving the surface's hydrophilicity of SC. The study indicated that SC@P-SMG has excellent mechanical properties, favorable anti-fouling properties, and superior self-cleaning ability. Furthermore, when the SC@P-SMG was applied in water purification , it could achieve multifunctional applications such as purifying wastewater containing emulsified oil and Pb 2+ ions, methylene blue (MB), and oil-water mixture separation. This work provided innovative ideas to maximize the benefits of combining fibroin and sericin.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Meng Lu,Yao Wang,Junxia Yu,Dezeng Li,Qingbiao Zhao,Ruan Chi
Phosphogypsum (PG) is a solid waste generated during the wet process of phosphoric acid production. The environmental-friendly disposal and recycling of PG is vital in the field of environmental solid waste treatment . In this study, PG is used for adsorbent of dyes in wastewater to achieve the goal of recycling waste with waste. Surfactant-modified phosphogypsum (ODBAC@PG) was prepared using octadecyl dimethyl benzyl ammonium chloride (ODBAC) as modifier. ODBAC@PG exhibits high adsorption capability for anionic dyes (methyl blue (MeB) and indocyanine carmine (IC)). The pseudo-second-order kinetic model fits the kinetic experimental data for the adsorption of two organic anionic dyes. Langmuir adsorption isotherm fits the adsorption characteristics of MeB and IC on ODBAC@PG, exhibiting a monolayer adsorption pattern. Thermodynamic parameters indicate the spontaneous and exothermic properties of MeB and IC on ODBAC@PG. MeB and IC have antagonistic effects on each other in binary adsorption system. High adsorption capacity after six cycles of experiments demonstrates the high reusability of ODBAC@PG. The nature for the adsorption includes electrostatic interaction, hydrogen bond and hydrophobic interaction. Using ODBAC@PG for dyes wastewater treatment can accomplish the goal of treating waste with waste and turning waste into treasure.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Luolu Zhou,Meng Chen,Hu Yang,Zhen-liang Xu
This study introduces a novel ultrafiltration (UF) membrane, called NFFM, which utilizes a nanofiber (NF) layer as an integral filler during the phase inversion process. The photoactive NFFM was prepared using photoactive PAN-C 3 N 4 (PCN) NF, which is made using C 3 N 4 nanosheets as a visible light responsive photocatalyst with a loading ratio of up to 20%. NFFM membranes made using PAN NF, hydrophilic modified PAN-C 3 N 4 (HPC) NF as filler, and PAN-C 3 N 4 blend membrane were also prepared for comparison. NFFMs showed special morphologies, such as porous surfaces, selective layer located at the internal interface in cross-section, diverse pore sizes and pore size distribution , which are different from that of the traditional blend membrane made with the same ratio of components. Because the dissolving of NF layer into the casting solution changes the composition, polymer distribution, and property of the casting solution, thus change the membrane property. Thickness, composition and surface states of NF Layer can influence its dissolution process. Membrane filled with PCN NF (NFFM-PCN) showed a smaller pore size than membrane filled with HPC (NFFM-HPC), due to the low solubility of HPC. Moreover, a longer contacting time can cause the casting solution penetrate into the surface of the HPC layer, leading to a smooth surface. Finally, dye rejection and photoactivity test showed that NFFM-PCN showed better dye rejection property and photoactivity than other membranes, despite the lower photoactivity of C 3 N 4 due to the coverage effect of PAN. Overall, this primitive study provides a new method for preparing a new type of membrane for some potential applications.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yang Cao,Yinhua Wan,Chulong Chen,Jianquan Luo
Nanofiltration (NF) is considered a competitive technique for acidic stream treatments. However, poorly reactive acid-resistant monomers normally cause thick and uneven separation layers with ultra-low permeability. Herein, catalyst-anchored secondary polymerization is employed after the interfacial polymerization (IP) reaction between trimesoyl chloride (TMC) and 3-aminobenzenesulfonamide (ABSA) to fabricate an extremely acid-resistant NF membrane. Acylation catalysts in ethanol are grafted on the nascent layer by reacting with residual acyl chloride groups to enhance the monomer reactivity, while the ethanol-induced nascent layer structure regulation greatly improves the surface uniformity. Benefiting from the improved self-inhibition effect and optimized phase integrity of the modified IP process, the resulting acid-resistant membrane has unprecedented water permeance (up to 31.4 Lm −2 h −1 bar −1 ), desirable Na 2 SO 4 rejection (92.8%), high dye/H + selectivity and impressive acid stability (20 wt% of H 2 SO 4 for 50 days), outperforming almost all advanced acid-resistant NF membranes. Our work provides a versatile approach for the synthesis of high-performance specialty membranes.
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高影响因子
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