SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Jinxin Liu,Pan Wang,Hengjia Zhu,Jianming Pan
Conventional heavy metal adsorbents are limited by passive mass transfer mechanisms that constrain separation efficiency in practical applications. Herein, we report a novel approach integrating autonomous nanomotor propulsion with selective molecular recognition for enhanced Pb(II) removal. Bullet-shaped Janus nanomotor adsorbents (JSNMs@IIPs) were synthesized through asymmetric emulsion templating, featuring silver nanoparticle-catalyzed propulsion chambers and ion-imprinted polymer recognition shells. Under H 2 O 2 fuel (10.0 wt%), JSNMs@IIPs exhibited controlled autonomous motion (23.1μm s −1 ) that delivered significant kinetic enhancement with 265 % faster adsorption rates compared to static systems. The JSNMs@IIPs achieved maximum Pb(II) adsorption capacity (158.5 mg g −1 at 318 K) while maintaining high selectivity (k = 16.8–61.3) against competing metal ions and excellent regenerability (93 % capacity retention over seven cycles). XPS analysis revealed coordination-based adsorption through Pb-N interaction formation within pre-organized imprinted cavities, while autonomous motion enhanced mass transfer through active convection. This work establishes motion-enhanced molecular recognition for advanced separation technologies, demonstrating that nanomotor propulsion can simultaneously improve kinetics and maintain selectivity in complex separation challenges.
研究领域:
环境科学
·
纳米技术
·
材料科学
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Analysis and Testing
·
2024
·
IF 5.5
Wang Nan,Li Jiaqi,Ma Yitian,Xu Ahua,Tao Huajin,Huang Baoyu,Hao Song,Liao Jianjun,Lin Shiwei,Tang Yipeng,Hou Ying,Bian Chao,Li Xiaogan
In this paper, a sensor using carbon nanospheres modified boron-doped diamond (CNs/BDD) electrode for detecting heavy metal ions rapidly in aqueous solution is studied. The CNs/BDD electrode is characterized systematically by techniques including scanning electron microscopy (SEM), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical properties of the CNs/BDD electrode, BDD electrode and Au electrode are compared by cyclic voltammetry. It is found that the CNs/BDD electrode has more negative hydrogen evolution potential, a wider potential window and a larger effective electrode area, which is conducive to the accurate detection of heavy metal ions. The square-wave anodic stripping voltammetry (SWASV) is applied to assess and quantify the sensing capability of the CNs/BDD electrode. The effects of deposition potential, deposition time and other experimental parameters on the detection performance are studied. Under the optimal experimental conditions, CNs/BDD electrodes exhibit remarkable detection capabilities for lead (Pb(II) ions, in which a linear relationship within the concentration range from 1 to 140 µg/L with a 0.9994 correlation coefficient is obtained. Meanwhile, it has excellent repeatability with a low relative standard deviation (RSD) of 0.57%, and the achieved actual limit of detection (LOD) reaches 0.01 µg/L. In addition, the interference experiment results show that except for Cd(II) ions and Cu(II) ions, other common ions in water have little interference to Pb(II) ion detection. The Pb(II) ions recovery rates are 89.1–115.7% in the real water samples. Experimental analysis indicates that the CNs/BDD electrode possesses the advantages of low detection limit, short detection time, and simple experimental equipment, which meets the requirements of Pb(II) ions field detection.
研究领域:
环境科学
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电化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Si Liu,JinHui Huang,Wei Zhang,LiXiu Shi,KaiXin Yi,ChenYu Zhang,HaoLiang Pang,JiaoNi Li,SuZhou Li
In this study, the adsorption behavior of Pb(II) on natural-aged and virgin microplastics in different electrolyte solutions was investigated. The results demonstrated that natural-aged microplastics exhibited higher adsorption capacity for Pb(II) compared to virgin ones, and the addition of CaCl 2 strongly inhibited the adsorption amount of Pb(II). The adsorption kinetics of Pb(II) adsorption were better fitted by the pseudo-second order model and Elovich equation, and were slowed down greatly at higher ionic strength. The rate-limiting steps of adsorption process were dominated by intra-particle diffusion. The adsorption isotherm of Pb(II) onto microplastics affected by salt ions can be well described by Freundlich model, the greater adsorption efficiency of natural-aged microplastics proved that adsorption process was multilayer and heterogeneous. In addition, pH significantly influenced the adsorption of Pb(II) due to the changes electrostatic interactions. The effect of fulvic acid in the electrolyte solutions was also revealed and attributed to the complexation with Na + and Ca 2+ . Furthermore, the higher pH and ionic strength in different environmental water dramatically decreased adsorption capacity onto microplastics. Finally, it’s confirmed that the adsorption mechanisms affected by salt ions mainly involve electrostatic interaction, surface complexation, and ionic exchange. These findings indicate that salt ions exert an important influence on the adsorption of heavy metals for MPs, which should be further concerned.
研究领域:
环境科学
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生态学
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·
IF 3.1
Bian Hang,Li Peng,Ma Yu,Liu Lin,Li Dong,Zhang Ning
In recent years, the surge in industrialization and urbanization has led to the release of a significant amount of heavy metal ions into water. These ions, when present in drinking water, can enter the human body and cause irreversible health problem. Metal-organic frameworks (MOFs) have drawn considerable attention for their outstanding ability to remove these heavy metal ions. However, MOF powders tend to aggregate in water, reducing their adsorption efficiency and potentially leading to secondary environmental pollution. In this regard, the development of MOF composites that are highly adsorptive, recyclable, and maintain stable dispensability in water is crucial for heavy metal ions removal. Herein, the in situ growth of zeolitic imidazolate framework (ZIF-8) on melamine sponge (MS) using a secondary growth method is reported. The resultant composite sponges exhibit high efficiency in adsorbing Pb(II) and Cu(II) from water and maintain good reusability. These findings offer a promising method in efficiently eliminating Pb(II) and Cu(II) from aqueous solutions.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
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2018
·
IF 3.641
Sidi Zhu,Mingzhu Xia,Yuting Chu,Muhammad Asim Khan,Wu Lei,Fengyun Wang,Tahir Muhmood,Along Wang
Herein, we reported the adsorption and desorption of Pb(II) on l -lysine modified montmorillonite (L-Mt) with molecular dynamics simulation. l -lysine (Lys) modified montmorillonite (L-Mt) was prepared, characterized by various analytical techniques, and the simulation studies were performed to evaluate the interlayer structure and interaction properties of l -lysine and L-Mt. The results of X-ray powder diffraction (XRD) and Fourier transform infrared (FTIR) spectrum suggested that Lys + was intercalated into the interlayer of Na-montmorillonite (Na Mt) successfully. The batch adsorption experiments were implemented to study the adsorption capacity of Pb(II) on L-Mt in water. The maximum adsorption capacity of Pb(II) on the L-Mt (up to 43.3 mmol/100 g) were considerably higher than that on Na Mt (up to 15.3 mmol/100 g), at room temperature. The adsorption isotherms of both, L-Mt and Na Mt can fit the Langmuir isotherm . The adsorption experiments showed that Pb(II) removal efficiency of L-Mt is better than Na Mt in acidic solution. The simulation results revealed the micro-mechanism of Lys + inserted into the interlayer gallery of Na Mt. It can be deduced that lysine interacted with montmorillonite surface mainly through the protonated side-chain amino group rather than through the protonated main-chain amino group or deprotonated carboxyl group . These consequences are expected to elucidate the adsorption mechanisms occurring at the water/clay minerals interface at atom level, providing significant insight into the adsorption and retention of Pb(II) on L-Mt composite, and lead to relevant engineering applications while treating heavy metals of wastewater.
研究领域:
环境科学
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材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Chao Xiong,Shixing Wang,Wentong Sun,Ying Li
Lead-containing wastewater comes mainly from batteries , petroleum refining, dyes, lead mine drainage and so on. Here, the nanosilica functionalized with diethanolamine (DPM-SNPs) was utilized as an adsorbent to remove lead ions from aqueous solution. TEM, SEM, XPS, FT-IR, Zeta potential and BET analyzer have been employed to characterize DPM-SNPs. The adsorption property of DPM-SNPs was studied by varying pH, reaction time, Pb(II) concentration and temperature. The selectivity, reusability and adsorption mechanism have been systematically studied. DPM-SNPs has a shorter adsorption equilibrium time (60 min) as well as a high efficiency for lead ions removal (154.38 mg/g) at 298 K. The optimized pH was 5.8, mainly due to electrostatic and chelation interactions between hydroxyl/amino groups and metal ions . DPM-SNPs showed better selectivity for Pb(II) again various interfering ions and the removal efficiency just decreased about 4% after five repeated circles. Besides, the adsorption behavior fit well to Pseudo-second-order kinetic, Langmuir and Dubinin-Radushkevich models, indicating that the chemical reaction is the rate-limiting step and the adsorption process belongs to monolayer adsorption. Thermodynamic studies revealed that the adsorption process was spontaneous, feasible and endothermic. Thus, the nanosilica functionalized with diethanolamine is a potentially effective and sustainable adsorbent for application in lead removal from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
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2019
·
IF 6.395
Ze Lin,Xiulan Weng,Gary Owens,Zuliang Chen
Most environmental contaminants exist as a complex mixture of both metallic and organic pollutants and it is thus often a major challenge to remove both components simultaneously. In this paper, due to its low cost and environmentally friendliness, iron nanoparticles (Fe NPs) were successfully prepared using a one-step green synthesis for the simultaneous in-situ remediation of mixed contaminants. Specifically Fe NPs were used for the simultaneous removal of Pb(II) and rifampicin. The removal efficiency for Pb(II) and rifampicin were 100% and 91.6%, respectively. To better understand the mechanism of mixed contaminant removal by Fe NPs various characterization methods and the major conditions impacting removal efficiency were examined. It was concluded that (1) polyphenols and caffeine, both ubiquitous in green tea extracts, acted as both reducing and capping agents during the preparation of Fe NPs, reducing the agglomeration of Fe NPs and increasing their stability and reactivity; (2) the removal mechanism of contaminants involved Pb(II) being adsorbed onto the surface of Fe NPs due to the innate strong adsorption of metal ions onto iron oxides , while rifampicin and Pb(II) both interacted positively with the functional groups on the surface of Fe NPs. Overall, this study demonstrated that green synthesis Fe NPs had potential for use as inexpensive and efficient adsorbent for the simultaneous removal of both Pb(II) and rifampicin from wastewater.
研究领域:
环境科学
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纳米技术
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生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2012
·
IF 3.461
Jianming Zhang,Shangru Zhai,Shi Li,Zuoyi Xiao,Yu Song,Qingda An,Ge Tian
Contamination of natural water with heavy metals (especially lead ions) is a problem of major concern and thus great demand of effective adsorbents for removal of toxic ions is increasing. Due to the task-specific properties of amino groups, core–shell nanostructures of Fe 3 O 4 @SiO 2 –NH 2 have been extensively investigated as advanced adsorbents; however, most studies on surface modification of Fe 3 O 4 @SiO 2 substances were of environmentally inefficient grafting methods. Herein, we demonstrated that mono-dispersed and spherical Fe 3 O 4 @SiO 2 –NH 2 nanomaterials can be facilely prepared by co-condensation of TEOS with APTMS employing a green sol–gel process. The as-prepared Fe 3 O 4 @SiO 2 –NH 2 magnetic nanoparticles (MNPs) prepared under optimum conditions possessing uniform core–shell structure (∼200 nm in diameter), relatively high loading of amino-functionality (∼5.45 wt%), easy recovery by external magnet and effective removal of Pb(II) ( q m = 243.9 mg/g, 25 °C). The adsorption was shown to be effective and a higher temperature was more favorable for the adsorption. The adsorption equilibrium data obeyed the Langmuir model and the kinetic data were well fitted to the pseudo-second-order model. Thermodynamic studies revealed the feasibility and endothermic nature of the system. These results demonstrated that the sol–gel produced Fe 3 O 4 @SiO 2 –NH 2 , due to its easy synthesis and recovery and eco-friendliness, can be a potential adsorbent for Pb(II) removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Liting Pan,Guanzhong Zhai,Xiaorong Yang,Hairong Yu,Changjing Cheng
Herein, we report a novel type of smart graphene oxide nanocomposites (MGO@PNB) with excellent magnetism and high thermosensitive ion-recognition selectivity of lead ions (Pb2+). The MGO@PNB are fabricated by immobilizing superparamagnetic Fe3O4 nanoparticles (NPs) and poly(N-isopropylacrylamide-co-benzo-18-crown-6 acrylamide) thermosensitive microgels (PNB) onto graphene oxide (GO) nanosheets using a simple one-step solvothermal method and mussel-inspired polydopamine chemistry. The PNB are composed of cross-linked poly(N-isopropylacrylamide) (PNIPAM) chains with numerous appended 18-crown-6 units. The 18-crown-6 units serve as hosts that can selectively recognize and capture Pb2+ from aqueous solution, and the PNIPAM chains act as a microenvironmental actuator for the inclusion constants of 18-crown-6/Pb2+ host–guest complexes. The loaded Fe3O4 NPs endow the MGO@PNB with convenient magnetic separability. The fabricated MGO@PNB demonstrate remarkably high ion-recognition selectivity of Pb2+ among the coexisting metal ions because of the formation of stable 18-crown-6/Pb2+ inclusion complexes. Most interestingly, the MGO@PNB show excellent thermosensitive adsorption ability toward Pb2+ due to the incorporation of PNIPAM functional chains on the GO. Further thermodynamic studies indicate that the adsorption of Pb2+ onto the MGO@PNB is a spontaneous and endothermic process. The adsorption kinetics and isotherm data can be well described by the pseudo-second-order kinetic model and the Langmuir isotherm model, respectively. Most importantly, the Pb2+-loaded MGO@PNB can be more easily regenerated by alternatively washing with hot/cold water than the commonly used regeneration methods. Such multifunctional graphene oxide nanocomposites could be used for specific recognition and removal of Pb2+ from water environment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Bao-Lin Zhang,Wei Qiu,Pan-Pan Wang,Yu-Lei Liu,Jing Zou,Lu Wang,Jun Ma
This study examined the effects of two kinds of iron-trimesic metal-organic frameworks (MOFs) [MIL-100(Fe) and Fe-BTC] on adsorption of Pb(II) and Cd(II). For both materials, adsorption of Pb and Cd nearly approached equilibriums in the initial 2 min with high pseudo-second-order kinetics rate constants (0.895 g·mg −1 ·min −1 for Pb and 1.416 g·mg −1 ·min −1 for Cd). Both materials showed better adsorption performance with the increase of solution pH (from 2 to 7). Adsorption processes were endothermic, entropy-increased and spontaneous. The higher enthalpy change ( Δ H 0 ) and entropy change ( Δ S 0 ) values for Cd adsorption reflected the more difficult adsorption of Cd compared with Pb, which is related with more negative hydration enthalpy ( Δ H hyd Θ ) and larger ionic radius of Cd. Multilayer adsorption phenomena appeared with no maximum adsorptive capacity observed. Both Langmuir-Freundlich and Freundlich-BET models could well describe isotherms. Multilayer adsorption may be attributed to the formation of inner-sphere complexation and outer-sphere complexation. Bockris-Devanathan-Muller (BDM) electrical double layer theory was used for illustrating adsorption mechanism. The fixed-bed adsorption experiments with Fe-BTC showed outstanding elimination performance in initial operating period (>99.8% for Pb and >99.6% for Cd), with effective filtration volume of 980 mL for Pb and 300 mL for Cd. Recyclability test showed that Fe-BTC could be well regenerated by ethylenediamine tetraacetic acid disodium salt (EDTA-2Na). This study showed that MIL-100(Fe) and Fe-BTC are potential for practical heavy metal removal applications.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 59
·36929-36934
·
IF 3.108
Danfeng Qin,Ruiyu Xu,Hangjia Shen,Xamxikamar Mamat,Le Wang,Shanshuang Gao,Ying Wang,Nuerbiya Yalikun,Thomas Wagberg,Shiguo Zhang,Qunhui yuan,Yongtao Li,Guangzhi Hu
Nitrogen-doped mesoporous carbon (NMC) derived from a single small-molecule protic salt (p-phenylenediamine bisulfate) is used for sensing toxic heavy metal ions. Using Nafion, bismuth and NMC to anchor the glassy carbon electrode surface, the fabricate electrode shows high sensitivity for detecting Cd(II) and Pb(II). The limits of detection (S/N = 3) are estimated to be 0.3 μg L−1 for Cd(II) and 0.4 μg L−1 for Pb(II), respectively, which are 10 and 25 times lower than the maximum acceptable content for drinking water recommended by the WHO. Furthermore, the sensor is successfully used to analyze Cd(II) and Pb(II) in tap-water with high anti-interference capability and good recovery.
研究领域:
材料科学
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环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Kai Jia,Qiming Feng,Guofan Zhang,Wanying Ji,Wukai Zhang,Bingqian Yang
Smithsonite is a readily dissolvable carbonate mineral that is naturally hydrophilic, making recovery of this ore by flotation difficult. The flotation results showed that conditioning with only sodium sulfide (Na 2 S) did not successfully allow the smithsonite samples to float, whereas treatment with a combination of S(II), Pb(II) and xanthate (with Na 2 S as the sulfurizing reagent, lead ions (Pb(II)) as the activator, and xanthate as the collector) improved the flotation of smithsonite, achieving a mass recovery of 95.8%. A combination of analytical techniques, including X-ray diffraction (XRD), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS), in conjunction with depth profiling , was used to investigate the chemical nature of the sulfur and lead species on the smithsonite surface. For S(II)-conditioned smithsonite, a layer of ZnS formed on the smithsonite (ZnCO 3 ) substrates; this newly formed ZnS coating was amorphous or poorly crystallized. For smithsonite samples conditioned with S(II) and Pb(II), the microstructures and the phase constituents, obtained by AFM and XRD analyses, confirmed the formation of the PbS species with a cubic galena structure on the surface. XPS depth profiling showed that the PbS layer was 18-nm thick, which corresponds to 30 PbS molecular layers . This study presents direct evidence that the coating of the activation product, PbS, on the smithsonite surface was similar to a relatively thick galena layer, which led to successful flotation.
研究领域:
矿物学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）