CHEMOSPHERE
·
2020
·
IF 5.778
Ping Li,Yixing Wang,Hairong Huang,Shuai Ma,Hu Yang,Zhen-liang Xu
Catalytic membrane plays an important role in environmental remedy. In this study, we reported an Ag coated membrane (PAN-Si-Cu-Ag) with a high catalytic activity to reduce 4-nitrophenol (4-NP) and methyl orange (MO) from water. The best performance is 99% reduction degree and 280 L m −2 .h −1 .bar −1 flux for (4-NP) reduction at 4-NP: NaBH 4 = 1:50 (mM) during a 12-h filtration. The reduction degree for MO is above 90% and the flux is about 230 L m −2 ·h −1 ·bar −1 , which is almost the best report till now. The Ag coated membrane was prepared by metal displacement-epitaxial growth on silica covalent grafted PAN membrane (PAN-Si). Silica atoms were used as linker to ensure the good adhesion between polymer and metal NPs, the loss amount of Ag NPs from the coated catalytic membrane is loss about 2 μg/cm 2 after one month storage. Cheap metal NPs were firstly reduced on the surface of PAN-Si membrane and then used to displace Ag ions. Thus the obtained catalytic membrane showed a very high loading (28%). Finally, the catalytic filtration mechanism of 4-NP was distinguished by Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and adsorption measurement.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Zhaoxin Li,Wei Cai,Xin Wang,Yuan Hu,Zhou Gui
Efficient solar vapor generation has provided a feasible way to solve the water shortage in undeveloped and arid areas. However, some photo-thermal materials need additional large-volume support materials being harmful to carry around to obtain float capacity, while suppressing the solar steam generation. Herein, the decrease approach of surface tension was presented for solving the moist-environment degradation behavior of black phosphorus (BP) nanosheets and obtaining the self-floating capacity, thus applying BP nanosheets in solar vapor generation field. With the in situ cross-linking polymerization, trichloro(1H,1H,2H,2H-perfluorooctyl) silane successfully modified BP nanosheets (F-BP). Due to the significantly decreased surface tension, F-BP nanosheets are capable of self-floating easily on water surface and spreading out spontaneously. With assistance of desirable photo-thermal conversion capacity, self-floating BP nanosheets convert the incident photon into local heat, showing excellent vapor generation performance. With simulated sun illumination (1 kW/m 2 ), 238.7 g/m 2 BP nanosheets present the evaporation rate of ~0.9437 kg/(m 2 ·h) and efficiency of ~64.63 ± 2.3%. Meanwhile, the super-hydrophobicity successfully imparts BP nanosheets with resistance to the deterioration caused by salt precipitation. The carriable F-BP nanosheets are an ideal photo-thermal convertor to produce drinking water , successfully providing a feasible way to solve water shortage in limited condition.
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PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 51
·30304-30313
·
IF 3.119
Jie Li,Jingshu Zhang,Xuan Wu,Jiajun Zhao,Minjie Wu,Weiwei Huan
Removal of soluble organic and inorganic contaminants from wastewater to produce clean water has received much attention recently. However, the simultaneous enhancement of water permeability and removal efficiency is still a challenge for filtration membranes. Here, we present a new kind of nanocomposite paper (CSH/CNF) consisting of calcium silicate hydrate (CSH) nanosheets and cellulose nanofibers (CNFs), and demonstrate the rapid water filtration and highly efficient contaminant (e.g., dyes, proteins, and metal ions) adsorption properties. The CNFs can serve as the bridging material to connect the CSH nanosheets to form a porous network structure and vital channels in the CSH/CNF paper for rapid water transportation. The weight ratio of CSH nanosheets in the paper is up to 75–85%. The weight ratio of CSH nanosheets has a significant effect on the water permeability and removal efficiency. The water permeability of the CSH/CNF paper with 82.5 wt% CSH nanosheets reaches as high as 312.7 L m−2 h−1 bar−1, which is about 14.7 times that of the CSH/CNF paper with 75 wt% CSH nanosheets. Because of the high specific surface area and abundant adsorption sites of CSH nanosheets, the CSH/CNF paper with 82.5 wt% CSH nanosheets exhibits high adsorption capacities and removal efficiencies for methyl blue (242.6 mg g−1, 97.3%), bovine serum albumin (289.2 mg g−1, 98.5%) and Pb2+ ions (366.2 mg g−1, 98.2%). The CSH/CNF nanocomposite paper holds great potential for application in environmental wastewater purification.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Hengrao Liu,Guanhua Liu,Min Zhang,Hao Zhao,Yanjun Jiang,Jing Gao
Tannic acid (TA) is a promising material to prepare nanofiltration membranes due to its multiple interaction abilities with metal ions and zwitterionic polymer via coordination interaction and electrostatic interaction, respectively. Herein, we proposed a multiple layer-by-layer (mLBL) assembly strategy using three assembly materials for the rapid preparation of TA based zwitterionic nanofiltration membranes with enhanced antifouling performance, which was compared with the non-zwitterionic nanofiltration membranes prepared via the conventional layer-by-layer (cLBL) assembly. Among a series of transition metal ions, Fe 3+ was chosen to prepare nanofiltration membranes. The ATR-FTIR and XPS analysis revealed the TA/Fe 3+ layer was formed and the poly(sulfobetaine methacrylate) (PSBMA) polymer was successfully assembled on membrane surface. The prepared zwitterionic nanofiltration membranes showed enhanced hydrophilicity, roughness and zeta potential than the non-zwitterionic nanofiltration membranes. The influence of TA/Fe 3+ bilayer number and PSBMA concentration on membrane performance was systematically studied and the rejection properties of the prepared membranes for dyes and salts were also investigated. Under the optimum preparation condition, the zwitterionic (TA/Fe 3+ ) 1.5 /PSBMA membrane showed water permeability of 40.36 LMH/bar with rose bengal (RB) rejection more than 98% and Na 2 SO 4 rejection about 60%. Because of the introduction of the PSBMA polymer, the zwitterionic (TA/Fe 3+ ) 1.5 /PSBMA membrane showed better antifouling performance than non-zwitterionic (TA/Fe 3+ ) 2.5 membrane with similar rejection properties.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 33
·14198-14210
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IF 3.288
Yanrong Lan,Yingchun Wang,Han Zhang,Peng Shan,Xiaomeng Shi,Mengying Long
Reports about polyethylene terephthalate (PET) fabrics with durable superhydrophobicity and flame retardance are very limited. In this paper, durable superhydrophobic, photocatalytic, flame-retardant (FR) PET fabrics were fabricated for the first time by a green approach and further employed for various applications. Through layer-by-layer (LBL) alternate deposition of mixed polyelectrolytes, including branched poly(ethylenimine) (BPEI), phytic acid (PA), and ammonium polyphosphate (APP), the fabric obtained superior self-quenched flame retardance through deposition of only two bilayers (BL). The fire burned very slowly, and was self-extinguished after ignition for 8 s. The fabric was also anti-dripping. When the FR fabric was further coated with a layer of PDMS-grafted-TiO2@PDMS coating, it presented excellent superhydrophobicity and self-cleaning properties both under air and water conditions. Moreover, the final fabric showed durable superhydrophobicity, which presented resistance to repeated rinsing treatments, repeated peeling by adhesive tape, and cyclic abrasion treatments. This fabric also showed superior photocatalysis capability and photocatalytically stable superhydrophobicity. The finally coated fabrics could selectively and highly efficiently remove polluted oils from water and separate oil–water mixtures. This multifunctional fabric is believed to show very promising application potential in the flame retardance, superhydrophobicity, self-cleaning, water purification, liquid separation, and photocatalysis fields.
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高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Zhimin Wang,Fengjiao Zhang,Aimin Ning,Dongcan Lv,Guangce Jiang,Andong Song
Direct photocatalysis with plasmonic nanostructures represents a new and promising direction in pollutant disposal. In current practice, inert metal oxides are usually used as supports to load plasmonic nanoparticles . However, due to the lack of stabilizing functional groups on the surface of these metal oxides , the stability and dispersibility of the obtained nanostructures are poor. Herein, a nano-diamond (ND) material with easily functionalized surface was used as an inert support to load silver nanoparticles to prepare plasmonic nanostructures with direct photocatalytic ability. The plasmonic nanostructure can be easily prepared by modifying the surface of ND with pyridine groups and then reducing the silver precursor in-situ. Thanks to pyridine group's dual functions of complexing Ag nanocrystals and dispersing ND, the obtained plasmonic nanostructure not only has uniformly distributed Ag nanocrystals on ND surface, but also shows excellent multi-solvent dispersibility. we demonstrate that this novel plasmonic nanostructure can directly decolorization of methyl blue (MB) under visible light irradiation with a standard rate constant as high as 28.4 s −1 g −1 . In addition, the catalyst can be easily recovered and recycled for at least five times while maintaining high catalytic activity . The mechanism study shows that the localized surface plasmon resonance energy transfer of Ag nanoparticles is the direct driving force of MB degradation. The inert ND support can not only ensure the physical stability of Ag nanoparticles, but also avoid the attenuation of plasmonic resonance energy to matrix, which plays an indispensable synergistic role in promoting the rapid degradation of MB.
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高影响因子
DESALINATION
·
2020
·
IF 7.098
Yue Zhang,Kongyin Zhao,Zhijian Zhang,Huike Xie,Ziyi Li,Ze Lin,Chen Mo,Wendong Yang,Xiaolei Wang,Junfu Wei
Calcium alginate hydrogel is an eco-friendly material, but its wide application as a self-supporting filtration membrane is severely limited by the weak mechanical properties, which makes it difficult for the large scale preparation and the fixation of the membrane in filtration equipment. In this work, a fiber-reinforced calcium alginate membrane (CaAlg-PP) was prepared by coating calcium alginate (CaAlg) hydrogel on the polypropylene (PP) non-woven fabric treated with ethanol/water (v:v = 1:1) solution. The CaAlg-PP filtration membrane was characterized and used for dye/salt separation under a series of operating conditions. The membrane exhibited the co-operativity of the porous support layer and the CaAlg hydrogel in the compositing process, and also exhibited good pressure resistance, pollution resistance and low anionic dye adsorption efficiency. The optimized CaAlg-PP membrane had a high permeance (e.g. 20.3 L·m −2 ·h −1 for methyl blue at 0.1 MPa) and high dye rejection (e.g. methyl blue 99.5%), while low salt rejection (e.g. NaCl 7.5%), and the selectivity of methyl blue/NaCl was up to 185. The CaAlg-PP membranes made with simple processes and low-cost materials may provide new strategies for environmentally-friendly and economical low salts-containing wastewater treatment and dye recycling.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Jiao Meng,Yan Xie,Yi-Hang Gu,Xi Yan,Yan Chen,Xiao-Jing Guo,Wan-Zhong Lang
Novel polyvinylidene fluoride-calcium alginate (PVDF-CaAlg) nanofiltration (NF) membranes were prepared by impregnating electrospun PVDF substrates with sodium alginate solution and crosslinking with CaCl 2 solution. The NF membranes were characterized via field emission scanning electron microscopy (FESEM) equipped with an energy-dispersive spectrometry (EDS), attenuated total reflectance Fourier transform infrared spectra (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). The results show that the prepared PVDF-CaAlg NF membranes exhibit dual thin-film-composite (TFC) structure and superior surface hydrophilicity. The highest pure water flux can achieve 63.8 L·m −2 ·h −1 ·bar −1 accompanied with a 98.5% rejection rate for methyl blue (MB), which is superior to many polymeric NF membranes. The prepared PVDF-CaAlg NF membranes exhibit much higher rejections for seven typical dyes, and the rejection slightly rises with the increase of impregnating time. In the long-term filtration process, the permeation flux for dye solution remains stable. PVDF-CaAlg NF membranes show good anti-fouling performance to BSA protein and lactobacillus.
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高影响因子
POLYMER BULLETIN
·
2021
·Vol. 79
·期 1
·443-462
·
IF 2.87
Wang Chuanfeng,Chen Yingbo,Yang Kang,Hu Xiaoyu,Zhang Yufeng
In this study, a graphene oxide/polyvinylidene fluoride (GO/PVDF) tight hollow fiber membrane (HFM) with improved permeability was fabricated via one-step direct spinning process to fractionate the dyes and salts (NaCl and Na 2 SO 4 ) in textile wastewater. Scanning electron microscopy (SEM) indicated that the GO/PVDF HFM possessed a smooth and tight outer selective layer and a relatively porous and loose inner surface. The optimized HFM not only possesses a small mean pore radius of 1.14 nm, but also has a high pure water flux of 24.8 L/m 2 ·h·bar. The stronger negative charge (− 40 mV at pH = 7) was obtained by the GO/PVDF HFM. Due to the synergistic effects of size exclusion and charge repulsion, the resultant HFM exhibited excellent rejection for dyes (i.e., close to 100% for Congo red and Methyl blue, 98.9% for Eriochrome black T) and low salts rejection (i.e., 1% for NaCl, 11% for Na 2 SO 4 ). Besides, with appropriate addition of hydrophilic GO to the doped solution, the resultant membrane exhibited good hydrophilicity, antifouling property and excellent stability. The newly developed tight HFM would be of great significance for effective fractionation and treatment of textile wastewater.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Zhaojian Gao,Shuai Zhou,Yingmei Zhou,Hongri Wan,Cai Zhang,Bing Yao,Teng Chen
In this work, a feasible collaborative design method for preparing magnetic superhydrophobic PU-PDA-Fe 3 O 4 -Ag sponge was proposed. Inspired by mussels, polydopamine (PDA) was used as a bio-glue to adhere Fe 3 O 4 , Ag nanoparticles and octadecylamine to the skeleton of the PU sponge. Under the synergistic effect, Fe 3 O 4 , Ag nanoparticles and octadecylamine endowed the PU sponge with magnetic response properties, antibacterial activity and superhydrophobic surface. The obtained superhydrophobic PU-PDA-Fe 3 O 4 -Ag sponge showed high absorption capacity for various oils and organic solvents with up to 22.9–52.0 times its own weight, which possessed a comparable or relatively high adsorption capacity compared with other reported superhydrophobic PU sponges. Due to the magnetic properties and good elasticity of the obtained PU sponge, the adsorbed oil can be quickly circulated through magnetic recovery and mechanical extrusion. After 20 absorption-desorption cycles, the adsorption capacity of the modified sponge remained above 90.9 % of the initial value, and under negative pressure, the sponge can be used as a filter for continuous separation of light oil and heavy oil from water. In addition, the surface-modified PU sponge also shows excellent oil-in-water emulsion degreasing performance, and the separation efficiency of toluene in water can reach 96.4%. Interestingly, the resulting PU sponges exhibited antibacterial activity with the action of Ag nanoparticles, indicating their potential environmental adaptability and durability in bacteria-contaminated oil/water mixture. The multifunctional characteristics of the modified polyurethane sponge prepared in this study have great potential for the practical application of oil spill treatment.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Dapeng Liu,Yongliang Chen,Toan Trong Tran,Ganwei Zhang
Non-polyamide (non-PA) thin-film composite nanofiltration (TFC-NF) membranes have received tremendous attention in recent years, but their development is strongly hindered by the complicated fabrication process and the trade-off between permeability and selectivity. Here, we report a highly perm-selective non-PA TFC-NF membrane through 2-minute rapid assembly of tannic acid (TA) on hydrolyzed polyacrylonitrile (PAN) substrate via Fe 3+ intermediated regulation and coordination. The optimized membrane with a molecular weight cut off of ~390 Da showed high rejections for salts in a sequence of Na 2 SO 4 (90.2%) > MgSO 4 (83.4%) > NaCl (50.0%) > MgCl 2 (35.2%) and desirable rejections for organic pollutants (e.g. >99.0% dyes, 92.2% streptomycin and 81.8% chloramphenicol) while maintaining a pure water permeability of as high as 13.6 L·m −2 ·h −1 ·bar −1 , which clearly outperforms the reported non-PA membranes. In addition, the assembled TFC membrane showed excellent antifouling performance and reasonable structural stability against operation pressure and solution alkalinity. These results are highly promising and indicate a great potential for the membrane to be used in practical nanofiltration application, e.g. water purification and wastewater reclamation. Our work outlines the production of novel high-performance non-PA membrane with a fast fabrication process in a green chemistry context.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Hao Yang,Yi Wang,Shang Fang,Gang Wang,Lijing Zhu,Zhixiang Zeng,Linghui Wang
Janus membrane (JM) with opposite wettability has great potential in separation of oil-in-water (O/W) and water-in-oil (W/O) emulsions. In this work, we have reported a simple, low cost nanocasting/NIPS strategy for preparation of the superhydrophobic and underwater oleophobic surface of JM for the first time. Poly (vinylidene fluoride) (PVDF) and polyethylenimine (PEI) blend membranes were fabricated on PDMS modified non-woven fabric by non-solvent induced phase separation (NIPS) process. Then the as-prepared membranes were further modified with hydrophilic nano-SiO 2 to improve the hydrophilicity of the top surface. Peel off PDMS modified non-woven fabric, parts of PDMS chains were imprinted to the membrane bottom surface with micro-nano three-dimensional microstructures, resulting in superhydrophobic property. The as-prepared JM exhibits an asymmetric wettability with the water contact angle of 35.3° and 151.8° of the opposite surfaces. By changing the orientation of the membrane, oil or water can be filtered respectively. The as-prepared JM shows excellent separation performance for both O/W emulsion and W/O emulsion, the separation efficiency reached 99.72 % and 99.68 %, respectively, as well as good long-term stability. This work is expected to yield a new way to fabricate the superhydrophobic surface of JM.
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高影响因子
危险品化学品经营许可证（带存储）