SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Na Yang,Xu Guo,Jing Yu,Yu Zhang,Qi Liu,Jiahui Zhu,Hongsen Zhang,Jun Wang
The integration of external field-enhanced effects such as the photothermal effect has emerged as a promising strategy for improving the adsorption efficiency of adsorbents toward Cs + and Sr 2+ due to its energy saving and high efficiency. Herein, a multifunctional photothermal adsorbent is rationally designed and synthesized via a simple one-step hydrothermal method and electrostatic assembly by combining V, W co-doped MoS 2 , P-MXene, and biomass-derived carbon aerogel (VWMoS 2 /P-MXene/C). Doping of V and W induces the phase transition of MoS 2 to the more active 1T phase, providing more accessible active adsorption sites. Moreover, the 3D porous structure of the biomass-derived carbon aerogel offers sufficient water transport channels, accelerating the diffusion kinetics of Cs + and Sr 2+ . The excellent photothermal conversion capability of the VWMoS 2 /P-MXene/C composite drives water evaporation, which promotes the increase of local concentrations of Cs + and Sr 2+ in the water medium. This synergistic mechanism combining phase engineering and photothermal enhancement collectively contributes to the excellent performance in Cs + and Sr 2+ capture. The VWMoS 2 /P-MXene/C demonstrates adsorption capacities of 158.3 mg/g for Cs + and 110.1 mg/g for Sr 2+ within 1 h, respectively, under photothermal enhancement. Simultaneously, the adsorbent exhibits excellent ion selectivity and reusability. The possible adsorption mechanisms mainly involve surface complexation and electrostatic interactions. Moreover, VWMoS 2 /P-MXene/C demonstrates a long-term solar-driven desalination capability with an evaporation rate of 1.98 kg·m −2 ·h −1 in natural seawater. Notably, the VWMoS 2 /P-MXene/C also shows promising application potential for dye removal and oil adsorption. This work provides a universal strategy for designing multifunctional integrated adsorbents and promotes their practical applications in radioactive wastewater treatment and seawater desalination
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2019
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IF 3.858
Yongli Yuan,Xiaoting Lin,Tianhua Li,Tianyu Pang,Youren Dong,Rongjie Zhuo,Qiqin Wang,Yuting Cao,Ning Gan
Solid phase microextraction (SPME) Arrows with enlarged sorption phases and Arrow-shaped tips are good alternatives to classic SPME fibers. Developing SPME Arrows with functionalized coatings has become a growing area of SPME research. In this study, a zirconium metal organic framework/molybdenum disulfide (UiO-66/MoS 2 ) composite coating modified SPME Arrow was developed and coupled with gas chromatography-mass spectrometry for the headspace extraction and detection of 16 polycyclic aromatic hydrocarbons (PAHs). The coating preparation can be easily manipulated by the assembly strategy using silicone gels to adhere UiO-66/MoS 2 powder onto the surface of the Arrows. The prepared UiO-66/MoS 2 coated SPME Arrows exhibited clearly enhanced adsorption capacity (2.1–4.5 folds) and an improved degree of affinity to PAHs species when compared to commercial PDMS/CARS/DVB SPME Arrows or fibers. The improved mechanism may be due to the high specific area, hierarchical micropores and mesopores, and the largely increased and immobilized amount of UiO-66/MoS 2 coating on the stainless-steel Arrow. Under optimized conditions, the SPME Arrow-based assay was successfully applied to determine PAH levels in fish samples with satisfactory recoveries of 80.2–101% and relative standard deviations (RSDs) of less than 6%. The detection limits of PAHs were between 0.11–1.40 ng kg −1 . The coating showed satisfied reproducibility and repeatability (RSD <8.6%) with only 10 mL of 10% (v/v) acetone in water used as the extraction phase in an effort to be environmentally friendly. All of the results showed that the method is simple, sensitive, and robust. SPME Arrows with UiO-66/MoS 2 coatings can provide new opportunities for the efficient extraction of persistent organic pollutants in food safety applications.
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DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
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IF 7.6
Tianrui Yang,Yu Liu,Jingyi Chen,Junsheng Liu,Shan Jiang,Xiaoxue Zhang,Chunyu Ji
Lead(II) is a potential carcinogen of heavy-metal ions (HIs). With the wide application of Pb-bearing products including lead alloy products, and new-energy lead-ion batteries, lead pollution has become a tricky problem. To solve such a difficulty, novel ultrathin MoS 2 -vinyl hybrid membranes (MVHMs) with a “spring” effect were synthesized via co-polymerization of acrylic acid, styrene and molybdenum disulfide (MoS 2 ) and their adsorptions for HIs were explored. The “spring” effect derived from the interaction between the tendency of the short polyacrylic acid (PAA) chain connected with MoS 2 to spread outward and the coulomb force between layers from MoS 2 (s-MoS 2 ), which enlarge the spacing of MoS 2 layers without changing the number of layers after membrane formation, which changes the swelling membrane to a dense membrane and reduces the original thickness from 0.5 cm to 0.011 mm in the thickness direction. The adsorption experiment revealed that these MVHMs had super adsorption performance and high selectivity for Pb 2+ by comparison with other five metal ions: Cu 2+ , Cd 2+ , Ni 2+ , Cr 3+ and Zn 2+ . Especially, the adsorption quantity of MVHMs for Pb 2+ could approach 2468 mg/g and the maximum adsorption ratio of q e [Pb 2+ ]/q e [Cu 2+ ] can reach 10.909. These values were much larger than the data obtained with the adsorbents reported in the last decade. A variety of models are applied to evaluate the effect of ionic groups. It was confirmed that –COOH plays a key role in adsorption of HIs and s-MoS 2 also has a certain contribution. Conversely, ion exchange plays only a minor role during the period of adsorption process. Effective diffusion coefficient (D eff ) of Pb(II) had the largest values among these metal ions. Hence, these hybrid membranes are promising adsorbents for the removal of Pb 2+ from water containing various ions.
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PubMed
高影响因子
Journal of Water Process Engineering
·
2023
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IF 7
Fangke Yu,Xiaochun Xu,Jing Yang
In this study, precursor ultrathin molybdenum disulfide nanosheets and ZIF-67 was selected to prepare Co and N co-doped porous carbon by the support of Mo (MoS 2 /Co@NPC) to activate peroxymonosulfate (PMS) for perfluorooctanoic acid (PFOA) degradation. The morphology, crystal form and composition of MoS 2 /Co@NPC are studied by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and other methods. In MoS 2 /Co@NPC/PMS process, PFOA was completely degraded in 180 min at pH 7, 0.3 g/L catalyst, 0.1 mM PMS and reaction temperature of 25 °C. The degradation efficiency was much higher than that in other systems. The oxidative species for PFOA degradation was studied using free radical quenching experiments and electron paramagnetic resonance (ESR) tests. SO −4 plays a major role in the degradation of PFOA, OH plays an auxiliary role, and 1 O 2 contributes the least. The effect of different types and positions of cobalt‑nitrogen and molybdenum atoms on the electrocatalytic activity was investigated by density functional theory (DFT) calculations. The co-doping of Co and N into carbon-based materials can synergistically enhance by Mo for the activation of PMS. The unsaturated S atoms on the surface of metal sulfides can trap protons to form H 2 S while exposing the reducing metal active site, which also accelerates the rate-limiting step of the Co 3+ /Co 2+ conversion. The core-shell structure of Co@NPC doped with Mo has the characteristics of improving the electron transfer ability of carbon, promoting the mass transfer of reactants, and preventing cobalt metal agglomeration and metal dissolution. The degradation pathways of PFOA were investigated and three possible pathways were proposed. In addition to PFOA, MoS 2 /Co@NPC-800/PMS system can also remove contaminant in pharmaceutical wastewater, indicating that the process has potential application value in practical wastewater treatment .
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高影响因子
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