首页期刊导航|Separation and Purification Technology
期刊信息/Journal information
Separation and Purification Technology
Elsevier Science B.V.
Separation and Purification Technology

Elsevier Science B.V.

1383-5866

Separation and Purification Technology/Journal Separation and Purification TechnologySCIEIISTP
正式出版
收录年代

    Synergistic effect of dielectric barrier discharge plasma and Ho-TiO2/rGO catalytic honeycomb ceramic plate for removal of quinolone antibiotics in aqueous solution

    Chen, YongyangLi, FulinChen, HaoHuang, Yixuan...
    12页
    查看更多>>摘要：A novel and efficient dielectric barrier discharge (DBD) plasma-catalytic system was studied, and Ho-TiO2/rGO catalytic honeycomb ceramic plates were successfully prepared via a sol-gel method. Norfloxacin (NOR) was selected as typical quinolone antibiotics to evaluate the catalytic oxidation activity of the system. The degradation rate of the system was increased by nearly 20% after the addition of photocatalyst. Moreover, the physical and chemical properties of the catalysts were characterized by various characterization techniques. The effects of different initial power, pH, conductivity, pollutant concentration, etc. on the degradation efficiency of quinolone antibiotics have also been investigated. The results show that the DBD plasma coordinated with a photocatalytic system possessed higher catalytic oxidation activity. The possible degradation pathways were derived from the main intermediate products by HPLC-MS analysis. It can be concluded that center dot OH, h(+), and center dot O-2(-) were the major active radicals in the system, and these radicals cooperated with active substances (O-3 and H2O2) to complete the degradation of quinolone antibiotic. The potential DBD plasma synergistic photocatalysis mechanism was proposed according to characterization and experimental results. This work provides a simple and feasible research direction for the synergy of different technologies to remove organic pollutants in water.
      原文链接:
    • NSTL
    • Elsevier

    The optimized flow-electrode capacitive deionization (FCDI) performance by ZIF-8 derived nanoporous carbon polyhedron

    Wang, JianShi, ZhengluFang, JieChu, Benli...
    8页
    查看更多>>摘要：Flow-electrode capacitive deionization (FCDI) has developed as a promising technology to realize the highly efficient and low-energy-consumed desalination process. To deliver better desalination performance, the flow-electrode with high capacitance and low resistance is essential. As for the traditional AC flow-electrode, although it is low-cost and wide-applied, the relatively low capacitance and poor conductivity are the limitations for its further development. Here, we propose a novel flow-electrode material, nanoporous carbon polyhedron (NCP), which was prepared by ZIF-8 followed by carbonization and activation process and have a higher surface area and larger specific capacitance than AC. The desalination experiments showed that the current density of FCDI system based on NCP is about 2.5 times larger than that of AC, exhibiting a higher desalination rate of 20.98 mu g cm(-2) min(-1) for NCP. Moreover, the desalination energy consumption and efficiency can keep relatively stable after the long-time continuous desalination cycling. This current research may be significant for the future promising application of highperformance FCDI system.
      原文链接:
    • NSTL
    • Elsevier

    Efficient adsorption of methylene blue from aqueous solution by hydrothermal chemical modification phosphorus ore flotation tailings

    Meng, WeileMa, ZeyuanShu, JianchengLi, Bing...
    9页
    查看更多>>摘要：Phosphorus ore flotation tailings (POFTs) are solid wastes produced in the phosphorus flotation process, and most of the POFTs are directly discharged into the tailing yard without treatment. In this study, modified phosphorus ore flotation tailings (MPOFTs) were synthesized by a hydrothermal chemical modification method as an efficient adsorbent to remove MB. The MPOFTs, the effect of initial MB concentrations, reaction time and pH on the MB characterization, and the adsorption mechanism of MB were studied. The results showed that modification of POFTs had a great BET specific surface area (151.26 m2/g). The maximum adsorption capacity of MPOFTs for MB was 321.5 mg/g at an initial pH of 5.94, the initial MB concentration was 1400 mg/L, and the reaction time was 60 min and 293 K. Moreover, the kinetic adsorption data were well described by both Elovich and pseudosecond order models, while the isotherm data were best fitted by Langmuir model. A thermodynamic analysis indicated that the adsorption process was spontaneous and exothermic adsorption. This study provides a new method for the resource utilization of POFTs.
      原文链接:
    • NSTL
    • Elsevier

    Investigation on desorption process in fixed bed for lithium recovery

    Yang, YingJiang, HuixiongYu, Jianguo
    9页
    查看更多>>摘要：With the development of lithium-ion batteries, the demand for lithium increase rapidly. Adsorption method is one of the most promising method to extract lithium from salt lake brine. In this work, desorption process for lithium recovery from simulated salt lake brine was systematically investigated under various operational conditions in fixed bed columns packed with lithium-aluminum hydroxides adsorbent, including the effects of washing volume, temperature and flowrate on the washing performance, as well as the effects of elution flowrate and volume on elution rate of Li+. The optional washing temperature is 283 K, and washing flowrate is 45 mL/ min. The desorption rate of lithium is only affected by elution volume, and flow rate may not affect the Li desorption significantly under the temperature of 333 K. The reason might be that the diffusion rate is fast enough and the process is dominated by adsorption equilibrium. Thus, temperature may be a key factor to the performance of fixed bed desorption process. The concentration-dependent Homogeneous Surface Diffusion Model (HSDM) was developed to fit and simulate the dynamic elution performance of lithium in fixed bed column. The overall pattern of the elution process can be represented by the HSDM. These results provided significant data for the design, optimization and scale-up of the column desorption process for brine lithium recovery.
      原文链接:
    • NSTL
    • Elsevier

    Efficient degradation of phenolic wastewaters by a novel Ti/PbO2-Cr-PEDOT electrode with enhanced electrocatalytic activity and chemical stability

    Zhou, QianLiu, DerongYuan, GuoyuanTang, Yi...
    9页
    查看更多>>摘要：Novel Ti/PbO2-Cr-PEDOT electrodes were prepared by electrodeposition for electrochemical degradation of phenolic wastewater. The electrodes were characterized by XRD, SEM-EDS, XPS, and FT-IR to study the crystalline, surface morphology, elements distribution, and microstructure of the electrodes. A flat and compact interface was obtained with Cr and PEDOT doping into beta-PbO2 plate by electrodeposition method. The linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were conducted to explore the electrochemical performance of the prepared electrodes. The Ti/PbO2-Cr-PEDOT electrode exhibited a higher oxygen evolution potential (OEP, 2.53 V vs SCE) and a lower charge transfer resistance compared with Ti/PbO2. Phenol degradation efficiency of 100% and TOC removal rate of 95.02% were achieved in the electrochemical degradation of phenol within 120 min. The optimal process parameters (phenol concentration = 1000 mg.L-1, electrolyte concentration = 4.0 g.L-1, current density = 15 mA.cm(-2) and electrode distance = 3 cm) in the process of electrochemical oxidation of phenol wastewater were explored. Active species trapping experiments proved that center dot OH radicals played an important role in the electrochemical system. Furthermore, the electrode also showed high activity for the degradation of other phenolic wastewaters such as phloroglucinol (eta(DEP) = 100%), bisphenol A (eta(DEP) = 97.17%) and p-chlorophenol (eta(DEP) = 89.77%) within 60 min. A possible degradation pathway was proposed based on the intermediate products determined by HPCL. The Ti/PbO2-Cr-PEDOT electrode showed excellent stability with only 3% loss of degradation efficiency (eta(DEP )= 96.95%) after recycling tests for 5 times. These results suggest that Ti/PbO2-Cr-PEDOT is a promising electrode for electrochemical degradation of phenolic wastewaters.
      原文链接:
    • NSTL
    • Elsevier

    Insight from the synergistic effect of dopant and defect interplay in carbons for high-performance capacitive deionization

    Ni, WeiSong, XueZhang, MingtaoHuo, Silu...
    9页
    查看更多>>摘要：Carbon-based materials with heteroatoms doping and structural defects have been regarded as effective alternatives to boost capacitive deionization (CDI) performance. However, the underlying interaction between doping and defects cannot be clearly clarified. Especially, there is still a lack of comprehensive research of the underlying interplay on CDI applications. Herein, a series of porous carbons with different degrees of dopants and vacancy defects have been precisely designed and prepared to further explore their capacitive properties. Density functional theory simulations combined with the electrochemical results elucidate that the doping-defect underlying can further optimize the distribution of charge density and structural characteristics to enhance the capability of ion adsorption and diffusion, thereby maximizing pore and heteroatom utilization. For another, N dopants can be transformed into the effective N configurations as active sites to remarkably facilitate the intrinsic affinity of ions, benefiting to the ion-adsorption ability. As a result, the optimized carbon sample (NC-P) exhibits a salt removal capacity of 23.6 mg g(-1) in 500 mg L-1 NaCl at 1.2 V. Also, in different ionic solutions, NC-P still shows superior ion-adsorption capability. This work not only provides a deep new insight to the critical role of the doping-defect interplay on carbon-based CDI applications, but also will inspire further work to reasonably design of carbons for prominent CDI performance.
      原文链接:
    • NSTL
    • Elsevier

    MOF-based MMMs breaking the upper bounds of polymers for a large variety of gas separations

    Daglar, HilalAydin, SenaKeskin, Seda
    14页
    查看更多>>摘要：Mixed matrix membranes (MMMs) are a strong alternative to the conventional polymeric membranes which suffer from a trade-off between selectivity and gas permeability. Considering the existence of a large number of metal-organic frameworks (MOFs) and polymers, computational screening of MOF/polymer MMMs is strongly desired to explore their upper limits in various gas separation processes before experimental efforts. In this work, we computed permeability of CO2, CH4, N-2, O-2, H-2, and He gases in 5599 metal organic frameworks (MOFs) using atomically-detailed simulations and then assessed performances of >180,000 different MOF/polymer MMMs for 11 different gas separations He/H-2, He/N-2, He/CH4, N-2/CH4, H-2/N-2, H-2/CH4 O-2/N-2, CO2/N-2, CO2/CH4, H-2/CO2, He/CO2 . Our results revealed that many MOF/polymer MMMs exceed the upper bounds due to their high gas permeability and/or selectivity. The impact of MOFs on the separation performances of polymers was examined to provide guidelines for the best MOF-polymer pairing for a variety of gas separations. Data showed that using MOFs as fillers significantly improves the permeability of CO2, CH4, N-2, O-2, H-2, and He gases in 41 different types of polymers without changing their selectivities. Many MOFs offer a great opportunity for MMM applications by improving both the permeability and selectivity of polymers such as of Teflon AF-2400 for N-2/CH4, PTMSP-co(95/5) for H-2/CH4, PTMSDPA for O-2/N-2 and PTMSP for CO2/CH4 separations. The best MOF fillers leading to MMMs with exceptional selectivities were found to have narrow pores and low porosities. These results will contribute to directing the experimental efforts to the best MOF/polymer MMM materials for numerous industrially important gas separation applications.
      原文链接:
    • NSTL
    • Elsevier

    Anchoring metal organic frameworks on nanofibers via etching-assisted strategy: Toward water-in-oil emulsion separation membranes

    Zhou, FuWang, YixingDai, LihengXu, Fang...
    10页
    查看更多>>摘要：Efficiently separating water-in-oil emulsions is urgent demand and still worldwide challenge. Nanofibrous membranes with super-wetting surface have drawn wide concern to solve it. Herein, under-oil superhydrophobic zeolitic imidazolate framework-71/poly(vinylidene fluoride-hexafluompropylene) (ZIF-71/PVDF-HFP) nanofibrous membranes were prepared via electrospinning and etching-assisted in-situ growth strategy for water-in-oil emulsions separation. ZnO was etched to create adsorption sites, ensuring the dispersed ZIF-71 nanoparticles firmly anchoring on nanofibers. The membranes showed under-oil superhydrophobicity with under-oil water contact angle 162.1 degrees. The membranes could effectively separate a variety of water-in-oil emulsions (such as dichloromethane, chloroform, and toluene) by gravity. The separation efficiency of all emulsions was higher than 99% and the flux of water-in-chloroform without surfactant reached up to 6577.68 L m(-2) h(-1) . Moreover, the membranes exhibited excellent cyclic stability and anti-fouling. Therefore, the MOF/nanofibrous membranes fabricated by etching-assisted strategy are promised candidates for efficient oil/water separation.
      原文链接:
    • NSTL
    • Elsevier

    Enhanced separation of base metal sulfides in flotation systems using Chitosan-grafted-Polyacrylamides

    Monyake, Keitumetse CathrineAlagha, Lana
    16页
    查看更多>>摘要：In this study, chitosan-grafted-polyacrylamide (Chi-g-PAM), a synthetic biocompatible polymer was investigated as a selective depressant of iron sulfide minerals [i.e., pyrite (FeS2)] in the flotation process of base metal sulfide minerals [i.e., galena (PbS), chalcopyrite (CuFeS2), and sphalerite (ZnS)]. Chi-g-PAM was successfully synthesized by grafting polyacrylamide chains onto chitosan backbone. The synthesized polymer was characterized using Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR), Nuclear Magnetic Resonance (NMR), Scanning Electron Microscopy (SEM), and X-ray Powder Diffraction (XRD) analysis. Adsorption studies of Chi-g-PAM on mineral surfaces were conducted using zeta potential, contact angle, and total organic carbon (TOC) measurements in addition to X-ray Photoelectron Spectroscopy (XPS). Adsorption tests showed that Chi-g-PAM was most selective to pyrite as compared to the base metal sulfides indicating that this polymer may have the potential to be used as pyrite's depressant in the flotation of base metal sulfides under specific conditions. XPS studies suggested that the depression of pyrite by Chi-g-PAM was due to chemisorption of the amine, amide, and hydroxyl groups of Chi-g-PAM at pyrite-water interface. The impact of Chi-g-PAM on the flotation response of sulfide minerals was investigated in both microflotation and batch flotation systems using model minerals and real sulfide ore, respectively. In microflotation tests of model minerals, the best separation efficiencies between valuable base metal sulfides and pyrite were achieved at pH 7. In batch flotation tests of complex sulfide ore of Mississippi Valley type (MVT) at natural pH (7.8), a separation efficiency of 61% was achieved between galena and pyrite when Chi-g-PAM was used compared to 35% with sodium cyanide (NaCN), the depressant that is commonly applied for this type of ore. However, the separation efficiency between chalcopyrite and pyrite was 15% and 21% with Chi-g-PAM and NaCN, respectively. Comparative studies indicated that Chi-g-PAM outperformed other depressants at producing less pyrite-diluted flotation concentrates.
      原文链接:
    • NSTL
    • Elsevier

    Properties, synthesis, and recent advancement in photocatalytic applications of graphdiyne: A review

    Shandilya, PoojaMandyal, ParteekKumar, VineetSillanpa, Mika...
    23页
    查看更多>>摘要：Carbon materials are inexpensive and high-performance nanomaterials producing ample scope for versatile applications. Graphdiyne (GDY) is a two-dimensional allotrope of carbon having sp and sp2 hybridized planar carbon atoms. GDY was firstly synthesized by Li and co-workers in 2010, having diacetylene linkages, conjugated system, wide surface spacing, and pores distribution, tunable electronic properties, good chemical stability, and semiconductor characteristics. In this review, we examine GDY properties, synthesis, bandgap tunability, and current advancement in photocatalytic applications. Recent modifications in electrical, optical, and magnetic properties and some strategies to alter the bandgap of GDY, including applying strain, doping, co-doping, morphology formulation, and heterojunction construction, were elaborated. Different structural morphological analysis, including nanotube, nanowires, nanosheets, nanowalls, and 3D GDY framework, were also discussed. Earlier GDY studies are bound to theoretical analysis as if now their experimental validation has also been reported for feasible photocatalytic applications. The GDY-based nanocomposites were extensively explored for photodegradation, photoreduction of CO2, photocatalytic hydrogen production. The focus of this review is to provide an in-depth understanding of GDY and promote the advancement in the development of next-generation photocatalytic systems derived from carbon materials.
      原文链接:
    • NSTL
    • Elsevier