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.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 27
·16161-16175
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IF 10.733
Jinxin Liu,Pan Wang,Mengdie Zhou,Yue Ma,Xiangheng Niu,Guoqing Pan,Jianming Pan
Potentially toxic dichlorophenols and heavy metal ions commonly coexist in industrial sewage, posing a serious threat to public health and the environment and making the treatment more challenging. Inspired by Suzhou bifacial embroidery, whereby the Janus-like planar structure allows different compositions to be compartmentalized onto two distinct surfaces, Janus silica nanosheets partitioning bispecific artificial receptors (i.e., molecularly imprinted sites and thiol groups) onto distinct recognition surfaces (J-MIPs/cys) were designed to independently take up 2,6-dichlorophenol (DCP) and Pb(II). For J-MIPs/cys, the thiol groups are expected to capture Pb(II) via chelating action and molecularly imprinted cavities act as highly specific recognition sites for DCP. J-MIPs/cys possessed uniform cross-sectional dimensions and thickness (∼25.3 nm), and a particle-like surface imprinted layer (∼21.8 nm). In the monocomponent system, J-MIPs/cys displayed fast binding kinetics (60 min and 45 min), large monolayer adsorption capacity (129.4 mg g−1 and 82.95 mg g−1), high affinity, and excellent regeneration after five reuse cycles (9.134% and 12.16% loss in adsorption amounts) for DCP and Pb(II), respectively. Additionally, a spontaneous and endothermic adsorption process was also confirmed. In a binary system, the presence of Pb(II) produced a prominent increase in DCP adsorption at high initial concentrations and a decrease at low initial concentrations, owing to the partial complexation of Pb(II) with excess DCP and occupation of imprinted sites by Pb(II). However, the uptake of Pb(II) was inhibited over the whole range of concentration in the presence of DCP due to the competitive adsorption onto thiol groups. In summary, J-MIPs/cys integrating novel bispecific receptors open wide possibilities for efficient and specific treatment of coexisting toxic pollutants.
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APPLIED CLAY SCIENCE
·
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.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-10
·
IF 5.705
Huang Yan-Qin,Yang Li-Na,Wang Yong-Sheng,Xue Jin-Hua,Chen Si-Han
The authors report on a one-pot approach for synthesizing highly fluorescent protamine-stabilized gold nanoclusters. These are shown to be a viable nanoprobe for selective and sensitive fluorometric determination of lead(II) via quenching of fluorescence via Pb(II)-Au(I) interaction. Under optimized conditions, fluorescence measured at excitation/emission peaks of 300/599 nm drops in the 80 nM–15 μM lead(II) concentration range. The detection limit is 24 nM, and relative standard deviations (for n = 11) at concentrations of 0.10, 4.0 and 15 μM are 1.6, 2.5 and 1.9%, respectively. The relative recoveries of added lead(II) in the water samples ranged from 97.9 ± 2.29% to 101.2 ± 1.83%.
Lead(II) ions are found to be able to selectively and sensitively quench the fluorescence of the protamine-gold nanoclusters (PRT-AuNCs). Thereby, an inexpensive, selective and sensitive lead(II) assay was established.
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yang Li,Ling Zhang,Linjiang Yu,Dequan Li,Haoyan Meng,Qiao Ai,Jinzhu Hu,Li Jin,Jinghui Gao,Gang Liu
Barium titanate ceramic is frequently used as a ferroelectric material and can be applied in the pulse power field in energy storage devices. Its properties, including dielectric , ferroelectric, and energy storage properties, can be significantly improved through doping. In this work, we prepared a series of (1- x )Ba 0.65 Sr 0.245 Bi 0.07 TiO 3 - x ZnO ( x = 0.005, 0.01, 0.02, 0.03) lead-free bulk relaxor ferroelectric ceramics by a traditional die-pressing processing route. The uniformity of the grain sizes for these ceramics was improved, and the grains were refined when a certain amount of ZnO was introduced into BaTiO 3 -based ceramics. In addition, the breakdown strength was improved in the case where the relaxor behavior was not significantly improved. It should be noted that the sample doped with 0.02 mol Zn showed the maximum room-temperature storage density (1.51 J/cm 3 ) at the largest electric field strength (210 kV/cm). At the same time, this ceramic exhibited good stability to temperature (60–150 °C) and frequency (10–100 Hz) variations, as well as fantastic fatigue resistance (10,000 charge-discharge cycles). This paper presents in-depth studies of the structure, morphology, electrical properties, and energy storage performance of ZnO-modified BaTiO 3 -based ceramics.
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Polymers
·
2018
·Vol. 10
·期 12
·1383
·
IF 2.935
Jian Shen,Nan Wang,Yang Guang Wang,Di Yu,Xiao–kun Ouyang
Composite adsorption materials combine the advantages of various adsorptive materials and compensate for the defects of single adsorbents. Magnetic montmorillonite (MMMT) shows good adsorption properties for Pb(II). In order to further improve the adsorption properties of MMMT, in this work, Zn-BDC, a kind of metal–organic framework (MOF), was modified onto the surface of MMMT by in situ polymerization. The composite material MMMT@Zn-BDC was characterized by Zetasizer, SEM, TEM, FTIR, XRD, VSM, and XPS. The influence of adsorption conditions on the adsorption capacity of MMMT@Zn-BDC for Pb(II) was examined, including the adsorbent dosage, pH of Pb(II) solution, initial concentration of Pb(II), and the temperature and adsorption time. Also, the adsorption mechanism was studied. The results of this study show that MMMT@Zn-BDC adsorbs Pb(II) via chemisorption. In addition, MMMT@Zn-BDC exhibits good potential for adsorbing Pb(II), including its high adsorption capacity (724.64 mg/g) and good recyclability.Keywords:Zn-BDC;magnetic montmorillonite;Pb(II);adsorption
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INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
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2018
·
IF 1.886
Xiaoyan Liu,Liya Cao,Xinying Zhang,Jing Chen,Zhuhao Huo,Ying Mao
At present, the remediation for organic pollutants and heavy metals co-contaminated soils is a challenge which needs to be broken through. In this study, alkyl polyglucoside (APG), citric acid (CA), and nitrilotriacetic acid (NTA) were chosen to enhance the phytoremediation of pyrene and Pb co-contaminated soils by perennial ryegrass. Through the comparison of the results with different applications, it could be found that the application of NTA was beneficial to the growth of perennial ryegrass, the underground and aboveground biomass were increased by 172.9–236.1% and 61.9–142.8%, respectively, meanwhile, photosynthetic activity of perennial ryegrass was affected positively. More importantly, the combined application of APG and NTA maximally promoted the accumulation and translocation of Pb (BF/TF, 0.44/0.61) and dissipation of pyrene (71.6%). These results indicated that the combined application of APG and NTA could be promising for future practical application of phytoremediation. However, the optimal dosage ratio of APG and NTA for phytoremediation needs to be further researched.
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CHEMICAL ENGINEERING JOURNAL
·
2012
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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.
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NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 11
·8802-8806
·
IF 3.086
Wenshu Yang,Jinhui Hao,Zhe Zhang,Bailin Zhang
Co3O4-modified Prussian blue (PB) nanocubes (PB@Co3O4) were prepared by a simple water-bath method with CoCl2 as the Co source. TEM, SEM, XRD and XPS results indicated the uniform distribution of island-like spinel-phase Co3O4 nanoparticles (NPs) on the surfaces of the PB nanocubes (∼200 nm). The PB@Co3O4 NPs exhibited both intrinsic oxidase- and peroxidase-like activities and were observed to rapidly oxidize the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) with or without hydrogen peroxide at acidic pH values. In contrast, PB nanocubes or Co3O4 NPs alone could not efficiently oxidize TMB without H2O2. The enzyme-like activity of PB@Co3O4 NPs was also influenced by the working pH and temperature. Based on the oxidase-like activity of PB@Co3O4 NPs, a facile colorimetric biosensor for detection of glutathione was successfully fabricated, and displayed a linear range of 0.1 to 10 μM (R = 0.9740) and limit of detection of 0.021 μM (S/N = 3). These results demonstrate the potential applications of PB@Co3O4 NPs in bioanalysis and biodetection.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Nan Wang,Xiao-Kun Ouyang,Li-Ye Yang,Ahmed Mohamed Omer
A novel composite material (MCNC@Zn-BTC) is synthesized from magnetic cellulose nanocrystals (MCNC) and a metal–organic framework (MOF), based on Zn(II) and benzene-1,3,5-tricarboxylic acid (Zn-BTC), using a simple mechanical agitation method at room temperature. The developed MCNC@Zn-BTC was characterized by SEM, TEM, FTIR, XRD, XPS, and VSM instruments. The impact of MCNC@Zn-BTC dose, initial Pb(II) concentration, contact time, pH, and adsorption temperature have been explored. Results demonstrated that only 30 min was needed to achieve the adsorption equilibrium; the maximum adsorption capacity was 558.66 mg/g at 298.2 K. Besides, data obtained were fitted to a Langmuir isotherm model (R2 = 0.9890), and the adsorption kinetics followed a pseudo-second-order model. In addition, the removal (%) of Pb(II) remained greater than 80% after five recycled times. Therefore, the novel MCNC@Zn-BTC adsorbent displays great potential to improve the quality of environmental water contaminated with heavy metals.
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POLYMER BULLETIN
·
2017
·Vol. 74
·期 12
·5231-5247
·
IF 1.43
Yang Dongcheng,Yu Lili,Chen Hou,Yu Yanbo,Xu Yuanyuan,Sun Jinming,Wang Yating
Bromoactylated apple seeds (BAS) was used as new source for the synthesis of environmental adsorbent. Apple seeds were modified by bromoacetyl bromide to obtain a macroinitiator for single electron transfer-living radical polymerization (SET-LRP) of acrylonitrile (AN). The amidoxime (AO) adsorbent was prepared by the reaction of the graft copolymer bromoactylated apple seeds (BAS)/polyacrylonitrile (BAS- g -PAN) with hydroxylamine. Amidoxime BAS- g -PAN (AO BAS- g -PAN) was used to remove Pb(II) and the maximum adsorption for Pb(II) was 1.58 mmol/g. AO BAS- g -PAN could also selectively adsorb Pb(II) from binary ion systems in the existence of Ag(I), Ni(II) and Zn(II). This efficient modifying approach provides a new powerful mean toward filling the gap on apple waste as a potential source for controlling heavy metal pollution.
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JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Shunlong Pan,Jiansheng Li,Gaojie Wan,Chao Liu,Wenhong Fan,Lianjun Wang
In this work, Fe 3 O 4 @Zr(OH) x yolk–shell nanospheres (YSNs) were synthesized via a two-step process and further examined as adsorbents for the removal of Pb(II). To understand the hollow structure on the adsorption properties of Pb(II), another adsorbent without hollow cavities, i.e., Fe 3 O 4 @SiO 2 @Zr(OH) x core–shell nanospheres (CSNs), was also prepared for comparison. The adsorption results showed that Fe 3 O 4 @Zr(OH) x YSNs exhibited 41.6% higher Pb(II) adsorption capacity as compared to that of Fe 3 O 4 @SiO 2 @Zr(OH) x CSNs. The isotherm was well fitted to Langmuir adsorption model with q max value of 310.8 mg/g after normalized by the weight of Zr in Fe 3 O 4 @Zr(OH) x YSNs. Scanning transmission electron microscopy (STEM) mapping results revealed that the existence of cavities between Fe 3 O 4 cores and Zr(OH) x shells is responsible for the improved adsorption performance. XPS analysis indicated the surface hydroxyl groups played a key role in the Pb(II) adsorption. The removal efficiency of Pb(II) was maintained above 90% in five consecutive adsorption–desorption cycles.
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