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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
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    Targeted recovery of Ag-Pd alloy from polymetallic electronic waste leaching solution via green electrodeposition technology and its mechanism

    Liu, YaSong, QingmingZhang, LingenXu, Zhenming...
    9页
    查看更多>>摘要：Electronic waste (e-waste), as hazardous waste, is a promising secondary resource of precious metals. The extraction of precious metals from e-waste has great environmental and economic benefits. Most of the existing methods have high energy consumption, environmental pollution or low recovery efficiencies. This study proposed the application of green electrodeposition technology to realize targeted recovery of Ag-Pd alloy from Ni, Cu, Ag, Pd, Bi polymetallic e-waste leaching solution. Linear sweep voltammetry was conducted to determine the feasibility of targeted extraction. The high purity of Ag-Pd alloy was realized by controlling the potential. The recovery efficiencies of Ag and Pd were 97.72% and 98.05% after 5 h in 0.5 mol/L HNO3 with applied potential of 0.35 V. The results indicated the formation of monophase Ag-Pd alloy. Besides, the effect of acidity and potential on the particle size of alloy was analyzed. Chronoamperometric method was applied to study the electrodeposition mechanism. The Ag-Pd electrodeposition followed three-dimensional instantaneous nucleation and growth mechanism analyzed with Scharifker-Hills model, thus producing a solid solution. The nucleation site increased with the overpotential. This study provides a novel, efficient and green approach for the targeted recovery of Ag and Pd from the complex multi-metal system of e-waste.
      原文链接:
    • NSTL
    • Elsevier

    The reduction of CO2/bicarbonate to ethanol driven by Bio-electrochemical system using reduced graphene oxide modified nickel foam

    Luo, TianlieSong, QiHan, JiaxiangLi, Yihua...
    9页
    查看更多>>摘要：In this study, the reduced graphene oxide modified nickel foam (abbreviated as RGO-Ni) was used as catalytic cathode to reduce CO2/bicarbonate to produce organics in catholyte (containing 0.45 M KHCO3), driven by bioelectrochemical system. The characterization of electrode materials were tested by Scanning Electron Microscope (SEM) and Cyclic Voltammetry curves (CV). The reduction products was analyzed by Gas Chromatograph - Mass Spectrometer (GC-MS). The power generation and the faradic efficiency of the reduction process was determined. The results indicated the RGO-Ni electrode showed much higher catalytic activity than Ni electrode or graphene oxide modified Ni electrode (GO-Ni). The results of GC-MS indicated the reduction products were ethanol (as primary product) and acetone (as by product). Over the RGO-Ni cathode, after 6 h reaction in catholyte with CO2 continuously aerated, the final concentration of Chemical Oxygen Demand (COD) was 389 mg L-1, and the concentration of ethanol was 167 mg L-1. The process maximum power density was 0.52 W m- 2 over RGO-Ni electrode, almost 17 times of the value (0.03 W m-2) using Ni cathode. The faradaic efficiency of the process was calculated as 70%, and the reduction mechanism of CO2/bicarbonate was suggested.
      原文链接:
    • NSTL
    • Elsevier

    Polishing monoclonal antibody using pH-responsive TiO2/polysulfone membrane in dual size-exclusion strategy (vol 213, pg 359, 2019)

    Ng, H. K. MelvinLeo, C. P.Lim, Theam SoonLow, S. C....
    1页
      原文链接:
    • NSTL
    • Elsevier

    In-situ construction of superhydrophobic PVDF membrane via NaCl-H2O induced polymer incipient gelation for membrane distillation (vol 274, 117762, 2021)

    Zhang, RenweiTang, WenyongGao, HaifuWu, Chunrui...
    1页
      原文链接:
    • NSTL
    • Elsevier

    Study on the adsorption of low-concentration VOCs on zeolite composites based on chemisorption of metal-oxides under dry and wet conditions

    Yin, TaoMeng, XuanWang, SitanYao, Xiaoyu...
    14页
    查看更多>>摘要：Adsorption is a classical process applied to eliminate air pollutants with low-concentration of volatile organic compounds (VOCs). The evaporation induced self-assembly (EISA) method was used to efficiently load metal-oxide nanoparticles on the NaY zeolite to improve the adsorption capacity for VOCs. Dynamic and static adsorption experiments were applied to investigate the adsorption of toluene, isopropanol and acetone by Y@MxOy (M = Ni, Co, Cu, Mn) under dry (RH = 0) and wet (RH = 50%) conditions. Compared with NaY zeolite, Y@MxOy with uniformly dispersed nanoparticles of metal-oxide significantly improved the adsorption capacity of VOCs, and Y@CoO exhibited the optimal adsorption performance for isopropanol (189 mg/g) and acetone (124 mg/g) under RH = 50%, yet Y@MnO2 showed the best adsorption capacity for toluene (50 mg/g). Several important properties of the Y@MxOy composites were determined by XRD, N-2 adsorption-desorption isotherm, SEM, TEM and EDS. Moreover, density functional theory (DFT) was used to systematically calculate the adsorption system and explored the mechanism of the weakening of competitive adsorption between VOCs and water molecules. The chemisorption of metal-oxides with the oxygen functional groups of VOCs greatly improves the adsorption capacity, which provides a new way to develop a neoteric adsorbent for VOCs.
      原文链接:
    • NSTL
    • Elsevier

    Preparation and characterization of high permeance functionalized nanofiltration membranes with antifouling properties by using diazotization route and potential application for licorice wastewater treatment

    Oulad, FaribaZinadini, SirusZinatizadeh, Ali AkbarDerakhshan, Ali Ashraf...
    16页
    查看更多>>摘要：In the scope of this study, radically and coupling functionalized polyethersulfone (RPES-CPES) was synthesized using the diazotization route to prepare high-performance nanofiltration (NF) membranes. The filtration performance of licorice aqueous solution by prepared membranes was evaluated systematically in a cross-flow filtration set-up for simulated produced water treatment. Compared with the bare-PES membrane, RPES and CPES incorporated membranes were found to possess an enhanced permeability and antifouling capability. The influence of driving force, cross-flow velocity, and feed concentration on the output permeated flux, rejection capability and fouling tendency of membranes were investigated. The more extreme fouling tendency accompanied by higher output permeated flux of the membranes was observed with enhancing the driving force and cross-flow velocity parameters. The results were shown that, when the concentration of foulants feed was increased, the output permeated flux of the membranes was decreased significantly. The chemical stability of modified membranes was also studied by evaluating the effect of harsh acidic and alkaline conditions on the membrane licorice filtration for a 96-h period. RPES blended membrane indicated great resistance in the acidic and basic environments, indicating surprising membrane resistance capability to chemical reagents. Diazotization-inspired modification has great potential for practical application in water treatment with advanced characteristics.
      原文链接:
    • NSTL
    • Elsevier

    Heavy metal and organic pollutants removal from water using bilayered polydopamine composite of sandwiched graphene Nanosheets: One solution for two obstacles

    Shahzadi, IqraKhan, Zulqarnain HaiderAkram, WaheedKhan, Waheed Ullah...
    14页
    查看更多>>摘要：The swift and unprogrammed industrial development has engendered several human hazards, including water contamination by heavy metals (Pb2+ and Hg2+) and organic pollutants largely added by agricultural operations (pesticide sprays). The deleterious effects of these contaminants have been extensively studied, highlighting the need for an efficient, quick, and targeted water treatment process. We built a cellulose graphene material sandwiched between double layered polydopamine (PDM) metal-organic framework (MOF). The composite material efficiently removed two water contaminants, i.e., heavy metals (Pb2+, and Hg2+), and persistent organic pollutants-POPs (PCB44 (2,2',3,5'-tetrachlorobiphenyl), and gamma-HCH (1,2,3,4,5,6-Hexachlorocyclohexane)). The material was proved a highly stable metal-organic MOF composite (FeBT-PDM21/CG(20)) under dynamic physical conditions (pH 2-12 and temperature 4-65 degrees C). The extrinsic porosity in the bilayered MOF was due to internally pinned PDM, porous for water, and binds 1758 mg of Hg2+, 488 mg Pb2+, 673 mg PCB 44, and 596 mg gamma-HCH per gram of the composite material. Water samples with a one ppm standard concentration of each contaminant were cleaned up to the drinking level after just one adsorption cycle with the MOF. The material effectively adsorbed persistent organic pollutants (POPs), leaving no detectable graphene traces in water. The novelty of the material lies in the quick water filtration process (1 mL/min by 1 cm(2) of material area) up to the drinking water quality. Furthermore, the cleaning property remained persistent at different physical conditions, including pH. Moreover, the material proved stable and robust during lab assays.
      原文链接:
    • NSTL
    • Elsevier

    Establishment of PPy-derived carbon encapsulated LiMn2O4 film electrode and its performance for efficient Li+ electrosorption

    Fang, Jia-WeiWang, JingJi, Zhi-YongCui, Jia-Li...
    14页
    查看更多>>摘要：Improving the cycle stability and Li+ electrosorption rate of the LiMn2O4 (LMO) film electrode in the selective Li+ electrosorption process is still a considerable challenge. In this work, a novel polypyrrole (PPy) - derived carbon encapsulated material LiMn2O4@Carbon/Nitrogen-4 (LMO@CN-4) was prepared by the threedimensional in-situ polymerization and high-temperature annealing of PPy on the LMO surface. The LMO@CN-4 film electrode showed a faster Li+ electrosorption rate, higher lithium-ion selectivity, and higher stability than the LMO film electrode. The maximum capacity of the LMO@CN-4 film electrode for Li+ could reach 34.57 mg/g within 40 min in 0.05 mol/L LiCl solution. Even in the simulated concentrated seawater with a low Li+ concentration (0.17 g/L), it could quickly reach adsorption equilibrium and maintain the high selectivity of Li+. The adsorption capacity was about 37.14 mg/g and the separation coefficient of alpha (Li+/Mg2+), alpha (Li+/ Na+), and alpha (Li+/Ca2+) was about 228.25, 2110.64, and 1381.89. The carbon encapsulation served as a conductive layer to enhance charge and ion transport. It also provided a buffer layer to prevent the volume collapse of the crystal and the dissolution of Mn. Therefore, the charge and discharge capacity of the LMO@CN-4 film electrode could be maintained at about 80% after 50 cycles at the 1C (148 mAh/g) rate, which was 20% higher than that of the bare LMO. What's more, the high cycle stability and Li+ electrosorption rate of the modified film electrode also suggested its potential for lithium electrosorption from concentration seawater.
      原文链接:
    • NSTL
    • Elsevier

    Synergy effect between adsorption and heterogeneous photo-Fenton-like catalysis on LaFeO(3/)lignin-biochar composites for high efficiency degradation of ofloxacin under visible light

    Chen, XinZhang, MingQin, HaoweiZhou, Jiancheng...
    14页
    查看更多>>摘要：The perovskite-type LaFeO3 serves as a promising photo-Fenton-like catalyst, but its low adsorption ability and catalytic activity inhibit the effective removal of ofloxacin. Herein, the LaFeO3 and lignin-biochar composites were fabricated by a facile sol-gel pyrolysis route. As compared with LaFeO3 nanoparticles, the LaFeO3/lignin-biochar composites showed better adsorption and degradation ability due to the synergistic effect between LaFeO3 nanoparticles and lignin-biochar. Compared with LaFeO3, the adsorption capacity of LaFeO3/lignin-biochar for ofloxacin increased from 0.72 to 30.4 mg.g(-1). Importantly, this catalyst exhibited the improved degradation efficiency of ofloxacin during 75 min (95.6 % for LaFeO3/lignin-biochar Vs 53.4 % for LaFeO3) as the adsorption process was combined with the photo-Fenton-like process. Notably, the lignin-biochar in the LaFeO3/lignin-biochar composites decreased the bandgap of LaFeO3 nanoparticles from 2.10 eV to 1.79 eV due to the interface interaction between LaFeO3 and lignin-biochar, facilitating the enhanced photo-Fenton-like activity. The hydroxyl radicals that were generated in the photo-Fenton-like process effectively induced the oxidative degradation of ofloxacin, which was confirmed by free radical capture experiments and ESR characterization. Moreover, the photo-Fenton-like degradation pathway of ofloxacin was proposed according to LC-MS analyses, and the toxicity analysis of degradation intermediates was further carried out. Hence, the LaFeO3/lignin-biochar composite was a promising photo-Fenton-like catalyst to eliminate ofloxacin via coupling of adsorption and photo-Fenton-like processes.
      原文链接:
    • NSTL
    • Elsevier

    Preparation of EDTA modified chitooligosaccharide/sodium alginate/Ca2+ physical double network hydrogel by using of high-salinity oilfield produced water for adsorption of Zn2+, Ni2+ and Mn2+

    Yue, HaoyuShang, ZhijieXu, PanFeng, Dongyue...
    10页
    查看更多>>摘要：A novel EDTA functionalized chitooligosaccharide/sodium alginate/Ca2+ physical double network hydrogel (ECSDNH) was prepared by using of high-salinity oilfield produced water. The formation and structure of ECSDNH were characterized by FT-IR and SEM. Various factors, including EDTA functionalized chitooligosaccharide content, pH of solution, initial concentration of heavy metal ions, temperature and contact time, were thoroughly investigated to explore their effect on adsorption capacity of ECSDNH. The obtained results showed that ECSDNH had higher adsorption capacity for Zn2+, Ni2+ and Mn2+. The maximum adsorption capacities of Zn2+, Ni2+ and Mn2+ were 160.19 mg/g, 72.67 mg/g and 52.43 mg/g at 298 K, respectively. The pseudo-second-order kinetic model and Langmuir isotherm model fit the experimental data fairly well. The thermodynamic parameters of the adsorption, Delta H degrees, Delta S degrees, and Delta G degrees, were also calculated. In addition, the ECSDNH still had higher removal efficiency for three metal ions after three adsorption-regeneration cycles, indicating its potential application for removing heavy metal ions from wastewater.
      原文链接:
    • NSTL
    • Elsevier