DESALINATION
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2023
·
IF 9.9
Qingyi Wang,Yongping Dong,Junmei Ma,Huimin Wang,Xuping Xue,Chaojie Bai,Mingjie Lin,Lingping Luo,Congjie Gao,Lixin Xue
Polyamide/polyethylene thin film composite (PA/PE-TFC) NF membranes were prepared from reverse-phase interface polymerization (RIP) for improved Mg(II)/Li(I) separation. RIP processes between 1,3,5-benzenetricarbonyl chloride (TMC) in bottom organic phase and piperazine (PIP) in upper aqueous phase were developed to form continuous and intact surface PA separation layers on PE porous substrates thinner than traditional polysulfone (PSF) based substrates. After activation with isopropyl alcohol (IPA), PA/PE-TFC-IPA NF membranes were formed, whose NF performance could be tuned by adjusting the preparation conditions. When TMC concentration was kept at 0.15 % w/v, RIP with low PIP concentration (0.025 wt%) yield PA/PE-TFC-IPA NF membranes with negatively charged surfaces , high Na 2 SO 4 rejection rate (95 % ± 3 %) and water permeance (13–19 L·m −2 ·h −1 ·bar −1 ). RIP with high PIP concentration (0.3 wt%) formed PA/PE-TFC-IPA NF membranes with less negative surfaces, high MgCl 2 rejection rate (94.3 ± 0.7 %), low water permeance (4.8 ± 0.3 L·m −2 ·h −1 ·bar −1 ), and high Mg(II)/Li(I) separation coefficient S Li/Mg (18 ± 1) for 1000 ppm LiCl and MgCl 2 mixed solution. PA/PE-TFC-IPA NF membranes also showed good long-term stability and improved anti-fouling performance for positively charged pollutants, bearing high potential for applications in the lithium extraction processes.
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高影响因子
DESALINATION
·
2023
·
IF 9.9
Zhongyue Sun,Xuewu Zhu,Fengxun Tan,Weiwei Zhou,Yongrui Zhang,Xinsheng Luo,Jingtao Xu,Daoji Wu,Heng Liang,Xiaoxiang Cheng
Loose nanofiltration (LNF) membranes possessing high water permeance and outstanding dye/salt selectivity are highly desirable for fractionating dyes and salts for textile wastewater . Herein, inexpensive and nontoxic poly(vinyl alcohol) (PVA) was utilized as an aqueous monomer via interfacial polymerization to fabricate novel highly permeable LNF membranes upon activation by sodium hydroxide . Systematic chemical and structural analyses indicated that the prepared polyester membrane formed was loose, hydrophilic , and negatively charged. The properties of the LNF membranes were optimized by adjusting the curing temperature (70 °C–100 °C). The optimized PVA-based membrane (PVA-M70°C) showed excellent water permeability (52.6 L m −2 h −1 bar −1 ), favorable dye rejection (> 90.0 %) and low salt rejection (NaCl and Na 2 SO 4 rejection rates were lower than 5 % and 18 %, respectively). Furthermore, the PVA-M membrane demonstrated excellent antifouling properties and long-term stability. Considering the biodegradable nature and low cost of PVA, PVA-based polyester membranes show great promise for LNF membrane production on an industrial scale. This work advances the use of PVA as a green aqueous monomer in fabricating highly permeable LNF membranes for efficient dye/salt selectivity .
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Journal of Water Process Engineering
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2023
·
IF 7
Hongyu Zeng,Hui Wen,Lizhu Liang,Hao Hu,Ziwei Xiao,Dan Liao,Yijing Xiang,Changkun Liu
The discharge of wastewater containing oil and dye has caused serious water pollution, and it is difficult to achieve simultaneous oil-water separation and dye degradation with a single material. Herein, two multifunctional fabrics were prepared from different steps during one preparation process for the first time, as to the best of our knowledge, by simple chemical oxidation polymerization and dipping. Ag nanoparticles were introduced by reduction of polypyrrole (PPy) after the in-situ deposition of PPy on cotton (namely, CF-PPy/Ag). Then, CF-PPy/Ag was immersed in the polydimethylsiloxane (PDMS) solution to achieve wettability modification (namely, [email protected] /Ag). [email protected] /Ag not only showed good durability and superhydrophobicity, but also own excellent antibacterial property (>99.99 %) against E. coli and S. aureus . The fabric exhibited excellent oil-water separation performance and recyclability, with a high separation efficiency (>98.5 %) after 50 cycles. Meanwhile, CF-PPy/Ag could be applied for dye degradation due to the excellent antibacterial and photocatalytic activity. The degradation efficiencies of CF-PPy/Ag for methyl blue and methyl orange were 90.1 % and 95.2 %, respectively, after 90 min of simulated sunlight irradiation. More importantly, we further designed a simple device that combined both CF-PPy/Ag and [email protected] /Ag, which could simultaneously achieve efficient oil-water separation and dye degradation. Therefore, we believe that the efficient strategy of combining multifunctional cotton fabrics derived from different steps during one preparation process for multi-purpose purification of water can provide a promising solution for the treatment of complex water pollution and a new idea for the collaborative application of multifunctional fabrics in the field of oil-water separation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Bingsen Wang,Haotian Zhang,Nan He,Haonan Wang,Bo Jiang,Dawei Tang,Lin Li
Salt deposition is one of the most significant obstacles to emerging solar interfacial desalination. Several strategies have recently been developed to combat salt deposition. However, the poor performance of most reported salt-resistant evaporators (<1.5 kg m -2 h −1 ) severely restricts the practical applications of this technology. Inspired by seawater-grown mangroves, we propose a bionic hydrogel-aerogel composite (HAC) evaporator with a respiratory root structure in this work. This bionic evaporator consists of a high-osmotic-pressure polyacrylamide (PAM) ionic hydrogel and a hydrophobic aerogel with vapor transport channels. The vapor escape surface is spatially separated from the salt deposition interface by constructing numerous vapor escape channels within the bionic evaporator, resulting in highly efficient salt-resistant evaporation. The HAC evaporator can run salt-free for 50 h in seawater with an evaporation rate of 2.7 kg m -2 h −1 , which is twice that of most salt-resistant evaporators. In addition, the evaporator can achieve evaporation rates of 2.4 kg m -2 h −1 in 20% brine. This design significantly improves the evaporation rate when resistant to salt accumulation, providing a novel strategy for developing highly efficient, long-term stable solar interfacial evaporators.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Qian Chen,Lan Hong,Shang-Kun Jiang,Chun-Xu Zhang,Shan Wang,Wei-Xing Li,Shi-Peng Sun,Mei-Ling Liu
Organic solvent nanofiltration (OSN), due to the characteristics of energy saving, mild operation conditions, and less waste generation, is an effective tool for purification, concentration and solvent exchange of high-value-added products. Introducing an interlayer containing ZIF-8, which features high surface areas and adjustable pore structures , can effectively regulate the interfacial polymerization process to optimize the performance of OSN membranes. However, due to the lack of nucleation sites with the substrate, it remains technologically challenging to design the ZIF-8 interlayer with structure and property persistence for interfacial polymerization under mild conditions. Inspired by the processes of birds’ nesting, the processes of mixing PEG and ZIF precursor, coating, and fast heating are working here to stimulate the in-situ growth of ZIF-8 in a facile, green and ordered way. PEG allows uniform dispersion of ZIF-8 in one step and without involving organic solvents. Furthermore, the increased binding affinity between ZIF-8 and the membrane surface endows the composite membrane with uniform morphology and significantly enhanced stability. Overall, this strategy may provide a fast, eco-friendly, and scalable approach to design composite membranes with MOF and other nanoparticulate materials as interlayers.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jiang Li,Siyu Huang,Lunliang Zhang,Hongrui Zhao,Wenkai Zhao,Chengzong Yuan,Xiaomeng Zhang
The separation of oily wastewater, especially surfactant-stabilized water-in-oil emulsions, has become a pressing global challenge. Herein, to achieve ultrafast and efficient separation of water-in-oil emulsions, this work took advantage of the Dodecyltrimethoxysilane (DTMS)-modified TiO 2 sol to prepare a superhydrophobic fiberglass (FG) membrane via a facile one-pot in-situ deposition technique. The unique composite microstructure: stalactite-shaped TiO 2 -SiO 2 composite nanoparticles and multi-layer rough fibers were constructed on the fibrous membranes, which significantly increased the roughness and led to a water contact angle of 162.7°. As-prepared composite microstructures combined the capture, coalescence, and interception effects to achieve ultrafast gravity-driven separation of surfactant-stabilized emulsions, with a flux up to 3130.4 L m −2 h −1 for surfactant stabilized water-in-hexane and high separation efficiency above 99% for various emulsions. Additionally, the prepared membrane exhibited an excellent cyclic adsorption capacity of 4.25–19.07 gg −1 and high stability. Such an easy, cost-efficient one-pot in-situ deposition method provides a brand-new solution to fabricate superhydrophobic membranes for efficient separation of water-in-oil emulsions, thus exhibiting great potential in applications of domestic wastewater treatment, oil spill treatment, and oil industry development.
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高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Hengye Li,Xingwei Han,Lin Zhang,Wenjie Yu,Wenwen Bie,Meijie Wei,Zhongxia Wang,Fenying Kong,Wei Wang
Herein, β-cyclodextrin-containing hybrid polymers (P1, P2 and P3) were prepared through crosslinking partially benzylated β-cyclodextrin (PBCD) by octavinylsilsesquioxane (OVS). P1 stood out in screening studies and the residual hydroxyl groups of PBCD was sulfonate-functionalized. The obtained P1-SO 3 Na showed greatly enhanced adsorption towards cationic MPs and maintained the excellent adsorption performance towards neutral MPs. The rate constants ( k 2 ) of cationic MPs upon P1-SO 3 Na were 9.8–34.8 times larger than those upon P1. The equilibrium uptakes of the neutral and cationic MPs upon P1-SO 3 Na were above 94.5 %. Meanwhile, P1-SO 3 Na demonstrated appreciable adsorption capacities, excellent selectivity, effective adsorption of mixed MPs at environmental levels and good reusability. These results confirmed the great potential of P1-SO 3 Na as effective adsorbent to remove MPs from water.
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Na Zhang,Qiang Li,Chunhui Li,Zhen Li,Li Zhao,Xiaotai Zhang,Yi Wang,Zhenghua Li,Xianghua Dou,Wanling Cui,Saisai Li
In this report, a highly ordered mesostructured flexible silica-based nanofiltration membrane is fabricated using tetraethyl orthosilicate (TEOS) as a silica source and Pluronic F127 copolymer as a structure directing agent , and hydrolyzed polyacrylonitrile ultrafiltration membrane as a substrate by an evaporation induced self-assembly approach. The results show the fabricated silica/F127 (SF) composite membrane possesses ordered mesostructures with different space groups depending on the mass ratios of TEOS/F127. The membrane is negatively charged with an isoelectric point at pH 2.9, and it also has a very hydrophilic surface. The pure water permeability of the membrane is 32 Lm −2 h −1 bar −1 . The membrane also has high rejections to methyl blue (100%) and multivalent salts ( > 95%), and moderate rejection to divalent salt (78.5% for Na 2 SO 4 ). The ordering of the mesostructure enhances the membrane compactness, favoring the improvement of the separation performance. Additionally, the membrane possesses satisfactory resistances to humic acid (HA) and bull serum albumin (BSA) fouling, and bacteria adhesion due to the smooth and hydrophilic surface. Additionally, the salt rejection is stable in 0.5 M HCl for 11 h and/or active chlorine solution (pH = 5) with 9000 ppm·h chlorination strength accompanied by an obvious increase in permeate flux. The membrane also exhibits satisfactory performance stability in a long-term (168 h) running.
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高影响因子
LAB ON A CHIP
·
2023
·Vol. 23
·期 9
·2341-2355
·
IF 6.1
Weidong Fang,Zhi Tao,Haiwang Li,Shuai Yin,Tiantong Xu,Yi Huang,Teckneng Wong
Droplet coalescence with fast response, high controllability and monodispersity has been widely investigated in industrial production and bioengineering. Especially for droplets with multiple components, programmable manipulation of such droplets is crucial for practical applications. However, precise control of the dynamics can be challenging, owing to the complex boundaries and the interfacial and fluidic properties. AC electric fields, with their fast response and high flexibility, have attracted our interest. We design and fabricate an improved flow-focusing microchannel configuration together with a non-contact type of electrode featuring asymmetric geometries, based on which we conduct systematic investigations of the AC-electric-field-controlled coalescence of multi-component droplets at the microscale. Parameters such as flow rates, component ratio, surface tension, electric permittivity and conductivity were given our attention. The results show that droplet coalescence in different flow parameters can be achieved in milliseconds by adjusting the electrical conditions, which shows high controllability. Specifically, both the coalescence region and reaction time can be adjusted by a combination of applied voltage and frequency, and unique merging phenomena have appeared. One is contact coalescence with the approach of paired droplets, while the other is squeezing coalescence, which occurs in the start position and promotes the merging process. The fluid properties, such as the electric permittivity, conductivity and surface tension, present a significant influence on merging behavior. The increasing relative dielectric constant leads to a dramatic reduction of the start merging voltage from the original 250 V to 30 V. The range of effective voltage for coalescence decreases with the addition of surfactant, offering a stricter and yet higher selectivity on electrical conditions, about 1500 V. The conductivity presents a negative correlation with the start merging voltage due to the reduction of the dielectric stress, from 400 V to 1500 V. Finally, we achieve the precise fabrication process of the Janus droplet via implementation of the proposed method, where the components of the droplets and the coalescence conditions are well controlled. Our results can serve as a potent methodology to decipher the physics of multi-component droplet electro-coalescence and contribute to applications in chemical synthesis, bioassay and material synthesis.
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 24
·2214661
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IF 19
Jing Yang,Ligang Lin,Fengling Tang,Zixu Zhang,Zitian Liu,Meina Xu,Xu Yang,Qiying Wang,Aishan He,Qi Cheng,Chunhong Wang
The development of low-pressure or pressureless self-driven membranes is important for saving energy and overcoming the critical trade-off effect in membrane separation processes. However, conventional self-driven membranes rely on gravity, which is effective in the separation of large-sized materials but is still ineffective in the fine separation of small molecules. Herein, inspired by the capillary effect that exists in nature, a capillary force-induced membrane-driving strategy for fine separation at ultra-low pressures is demonstrated. Hydrophilic nanoparticles are prepared by a cross-linking reaction between tannic acid and 3-aminopropyltriethoxysilane and then introduce them into membrane pores to simulate sand accumulation with an aim to generate the capillary force. The membrane is then used in ultra-low pressure membrane separation. Interestingly, it is found that the membrane has excellent performance in the separation of dye/salt mixtures (dye rejection > 99%, salt rejection < 10%) and a high permeate flux (160 L m −2 h −1 ) under near “zero pressure” conditions. Moreover, the structural stability of the membrane is verified. Introducing capillary forces into membranes as an autonomous driving force can be a promising universal approach that can be added up to the toolbox for the efficient preparation of separation membranes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Junyang Pan,Dan Hua,Yiping Hong,Xi Cheng,Fangsong Guo,Kok Bing Tan,Ziqi Zhong,Guowu Zhan
Photocatalytic membranes with concurrent catalytic oxidation and separating functions possess promising potentials for the degradation of organic pollutants in wastewater treatment. Herein, we designed a hybrid photocatalytic membrane ( viz. , g-C 3 N 4 /GO/MCE) by vacuum-filtration-assisted assembling method, consisting of graphitic carbon nitride (g-C 3 N 4 ) nanosheets as a top layer, graphene oxide (GO) nanosheets as an interlayer, and commercial mixed cellulose ester (MCE) as a substrate layer. The microstructures, chemical compositions, and physicochemical properties of the designed g-C 3 N 4 /GO/MCE membranes were systematically characterized by a series of characterization techniques. Particularly, photocatalysis-filtration reactor cells were designed for the evaluation of the simultaneous separation and photocatalytic degradation performance in a single unit using both organic dyes and antibiotics as modeling pollutants in wastewater. Four parameters were adopted to represent the integrated photocatalysis-filtration performance of our designed photocatalytic membranes, including permeance ( P ), rejection ( R’ , filtration alone), removal ( R , combined photocatalysis-filtration under light-irradiation), and degradation rate ( D ). The hybrid membranes showed superior permeance and solute removal under visible-light irradiation (300 W, λ > 420 nm), in which the permeance was 20% higher than that of no-irradiation conditions. In addition, 10 consecutive cycling tests and light-on/off cycles of the as-prepared g-C 3 N 4 /GO/MCE membrane toward RhB showed quite stable permeance in the range of 268.9 to 352.9 L h −1 m −2 bar −1 , and the removal was maintained in the range of 88.4% to 95.4%, indicating excellent long-term stability. Remarkably, it also exhibited good removal performance of antibiotics ( e.g. , ofloxacin, norfloxacin, sulfamethoxazole, erythromycin, and roxithromycin). Accordingly, the designed hybrid g-C 3 N 4 /GO/MCE photocatalytic membranes with excellent photocatalytic activity and photocatalysis-filtration performance are promising for wastewater treatment and water purification applications.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jinsong He,Haitong Wu,Fan Ni,Fei Shen,Yanzong Zhang,Zhang Cheng,Mei Huang,Li Zhao,Ling Luo,Yu Zhang,Xiaochan An
Loose nanofiltration (LNF) membrane prepared by hydroxyl-based materials with excellent separation and antifouling properties has attracted great attention for treating textile wastewater. However, the construction and formation mechanism of the selective layer by using large polyphenol-based monomers was not well studied. Herein, a novel LNF membrane was fabricated by interfacial polymerization, in which a polyphenol named epigallocatechin gallate (EGCG) was employed as aqueous monomer to design the selective layer. The results illustrated that the formed polyester (PE) selective layer possessed a loose structure with smooth and hydrophilic surface. Notably, the EGCG with large molecular volume and polyphenol groups contributed to the larger molecular weight cut-off (MWCO) and hydrophilic PE layer with high permeability, whereas the small molecular trimesoyl chloride (TMC) accounted for the pore size reduction with low permeance. More importantly, the optimized EGCG-based LNF-4 membrane displayed a high water permeability of 41.7 LMH·bar −1 , high rejection of dyes (98.5 % for Congo Red (CR), 93.4 % for Methyl Blue (MB), and 94.8 % for Evans Blue (EB), respectively) and low rejection of salt (7.4 % for NaCl). Besides, under 60 g/L salt content, a high retention of CR (93.0 %) and high permeation of NaCl (95.1 %) could be still maintained. Furthermore, the LNF-4 membrane had a superior fouling resistance towards CR and EB with flux recovery rate above 96.4 %. The excellent antibacterial property also made LNF-4 more competitive in practical applications. This work can provide a new strategy for fabrication of outstanding multifunctional LNF membranes by large molecular polyphenol monomers.
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高影响因子
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