MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Songlin Wang,Nan Jiang,Qiying Zhang,Huabo Li,Hongying Niu,Tong Chen,Gongying Wang
Methyl phenyl carbonate (MPC) is one of the versatile carbonates; in particular, it is an important component in lithium-ion batteries. In recent years, the catalytic synthesis of MPC has become an important topic, but the development of highly active catalysts is still challenging. In this study, SBA-15-loaded nano-sized Pb–Bi catalysts with different Pb/Bi molar ratios were prepared by deposition–precipitation to improve the efficiency and selectivity. To investigate the relationship between the structure and performance of the catalysts, XRD , BET, SEM-EDS, HRTEM , H 2 -TPR, and XPS characterization, as well as catalytic activity and stability tests, were conducted. Results revealed that Pb–Bi/SBA-15 can efficiently catalyze the synthesis of MPC under solvent-free conditions, with the highest catalytic activity obtained over 6 Pb–1Bi/SBA-15. SBA-15 with a large pore size and a high specific surface area was suitable as catalyst carrier, and the average diameter of Pb–Bi oxide particles was ∼3.57 nm. The addition of Bi led to the improved dispersion of active components, which were highly and evenly dispersed on the SBA-15 surface. Furthermore, an appropriate proportion of Pb and Bi on SBA-15 was conducive to the considerable enhancement of the catalytic activity. Besides, Pb–Bi/SBA-15 also exhibited good durability and recyclability, making it a promising catalytic material for the synthesis of various carbonates.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhaoyong Ye,Ying Zhang,Li-an Hou,Menglu Zhang,Yuzhang Zhu,Yu Yang
In this study, a novel modified nanofiltration (NF) membrane was fabricated to treat radionuclide-contaminated water by incorporation of Prussian blue (PB), graphene oxide (GO) and polyethylene glycol (PEG) into polysulfone (PSf) substrate. In this work, PB provided a large number of adsorption sites for the membrane, GO improved the Donnan effect of the polyamide (PA) layer by enhancing the negative charge, and PEG promoted the uniform dispersion of PB through interparticle electrostatic interaction and steric hindrance while increasing the adsorption sites on the surface of channels in the substrate by adjusting the pore structure. A conceptual model for the role of substrate in interfacial polymerization was then proposed. The modified membrane achieved efficient rejection of cesium (Cs + , 99.5%) and strontium (Sr 2+ , 97.5%). Its Cs + rejection rate still remained high (about 96%) even in the treatment of natural surface water containing various inorganic salts and organic matters. What’s more, the modified membrane exhibited excellent stability in both strong acid solutions and long-term operation. Then, potassium chloride (KCl) solution was applied to regenerate the modified membrane, which achieved high generation rate as compared to traditional acid regenerants. The excellent filtration performance inferred that the novel GO/PB-modified NF membrane holds great application potential for the application of simultaneous removal of radioactive Cs + and Sr 2+ from contaminated water.
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ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Yage Li,Sabry M. Shaheen,Muhammad Azeem,Lan Zhang,Chuchu Feng,Jin Peng,Weidong Qi,Junxi Liu,Yuan Luo,Yaru Peng,Esmat F. Ali,Ken Smith,Jörg Rinklebe,Zengqiang Zhang,Ronghua Li
Removal of toxic chemicals from the environment using novel adsorbents is of great concern. In this study, a novel composite of molybdenum trioxide (MoO 3 )-engineered biochar (MoO 3 -BC) was derived from corn straw and synthesized for the removal of Pb(II) from water. The pyrolysis temperature of 600 °C was suitable for the thermal self-assembly of MoO 3 -BC. Although MoO 3 -BC had lower S BET (59.3 m 2 /g) than the pristine BC (157.8 m 2 /g), it had a stronger adsorption affinity to Pb(II). The Pb(II) removal capacity of MoO 3 -BC was 229.87 mg/g at pH 4.0, and the adsorptive removal of Pb(II) was fit using a pseudo-second-order model and the Langmuir model. High temperature favored the removal of Pb(II) by MoO 3 -BC; However, the removal of Pb(II) was inhibited with increasing the ion strength. The MoO 3 -BC revealed an acceptable stability and reusability, since the removal efficiency of Pb(II) remained above 80.7%, even after 8 cycles. The MoO 3 -BC effectively reduced ≥99.9% of Pb(II) in the polluted irrigation water. The Pb(II) removal mechanisms involved surface electrostatic attraction, ion exchange and surface complexation. These findings conclude that the MoO 3 -BC is a novel composite that can be used for the removal of Pb from contaminated water . More studies are needed to investigate the potentiality of MoO 3 -biochar composite for the removal of other metals from water in a mono and competitive sorption system.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Rui Wang,Qiu-hui Hu,Qiu-yue Wang,Ya-li Xiang,Shuang-hui Huang,Yong-zhen Liu,Shu-yu Li,Quan-liang Chen,Qing-han Zhou
The development of membrane for heavy metal ion removal in water treatment is still impeded by low adsorption efficiency, poor selectivity, and deficient recyclability, which has gained great interests in both laboratorial research and industrial application. Herein, our aim is to fabricate the magnetic ion-imprinted PAN membranes (MII-PMs) based on polyacrylonitrile electro-spun nanofibers with improved adsorption ability, selectivity, and recyclability for efficient and selective removal of Pb(II) from water. The chemical structure and chemo-physical properties of the as prepared MII-PMs were characterized. Remarkably, in competitive adsorption experiment the MII-PMs demonstrated a much higher adsorption capacity towards Pb(II) than other interfering metal ions with the selective order of Pb 2+ >Cu 2+ >Mg 2+ >Co 2+ >Ni 2+ >Cd 2+ >Zn 2+ >Na + >K + . In investigation of the adsorption mechanism towards Pb(II), the equilibrium adsorption data of MII-PMs fitted better with Freundlich isotherm equation, and the kinetic parameters matched well with pseudo-second-order mode. In regeneration and reusability experiment, the MII-PMs could be regenerated with eluting solution and displayed good adsorption capacity towards Pb(II) during 6 adsorption–desorption cycles. Only small amount of Fe ions was leached out after the regeneration experiments. Generally, the as prepared magnetic ion-imprinted membrane with improved adsorption capability, high selectivity, and excellent reusability towards Pb(II) ions can be utilized as a promising and efficiently potential adsorbent in actual water treatment.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2021
·Vol. 30
·期 5
·1995-2006
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IF 3.667
Shen Jian,Xu Xinyi,Ouyang Xiao-kun,Jin Mi-cong
Based on the excellent performances of nanocrystalline cellulose, sodium alginate, or K-carrageenan in Pb 2+ adsorption, nanocrystalline cellulose/sodium alginate/K-carrageenan composite hydrogel beads were prepared to adsorb Pb(II) from aqueous solutions. The objective of this study was to demonstrate the excellent potential of the composite hydrogel beads for heavy metal ion adsorption. We successfully prepared ecofriendly Fe-modified nanocrystalline cellulose/sodium alginate/K-carrageenan composite hydrogel beads and characterized them. The structure and adsorption mechanism were investigated using scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, and the optimal adsorption conditions were determined. The tricomponent hydrogel beads were robust and exhibited improved adsorption capacity for Pb 2+ and good reusability. The adsorption results could be fitted well with a pseudo-second-order kinetic model and the Langmuir adsorption model. The maximum adsorption capacity obtained by fitting was 351.04 mg g −1 . Recycling experiments revealed that the adsorption capacity of the adsorbent remained high after five cycles of reuse.
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RSC Advances
·
2021
·Vol. 11
·期 58
·36826-36835
·
IF 3.361
Yunlong Shi,Changjiang Yu,Mengying Liu,Qiang Lin,Man Lei,Darun Wang,Mengwei Yang,Yuting Yang,Jian Ma,Zhengya Jia
In this study, a spherical Fe/C composite (AIBC) was successfully prepared via carbonization of Fe3+-crosslinked sodium alginate. The removal capacity and mechanism of AIBC were evaluated for the adsorption of Pb(II) from aqueous solution and compared with that of commercial nanoscale zero-valent iron (nZVI). The effects of the initial concentration, pH of Pb(II) solution, the contact time, coexisting anions, and aging under air were investigated. The results showed that the pH had a strong impact on the adsorption of Pb(II) by AIBC. The adsorption data for AIBC followed the Langmuir model, while the maximum adsorption capacity at pH 5 was 1881.73 mg g−1. The AIBC had a higher adsorption capability than nZVI, especially under the condition of relatively high Pb(II) concentrations. The oxidation–reduction reaction between Fe and Pb(II) was the main mechanism for the adsorption of Pb(II) onto nZVI. AIBC converted the largest amount of Pb(II) into PbO·XH2O/Pb(OH)2 mainly by generating Fe2+.
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REACTIVE & FUNCTIONAL POLYMERS
·
2021
·
IF 3.975
Wenmei Tan,Wei Shi,Sheng Ding,Zhengfeng Xie
Using renewable substances as the raw materials, and through relatively greener synthetic processes to implement the preparation of novel functional polymers is an idea that accords with the concept of “sustainable development” and is highly desirable in nowadays polymer science. In this study, apigenin (as renewable phenol) and furfurylamine (as renewable amine) were selected to prepare bio-based benzoxazine derivative (AP-f) through Mannich reaction . Using AP-f and diphenylmethane-based diisocyanide (IC) as reactants, a type of cross-linked, semi-aromatic polyamide derivative (Bio-PA) was successfully prepared via benzoxazine-isocyanide mechanochemistry (BIC-MC) by ball milling manner. Chemical structure , elemental composition , micro morphology and stacking state properties of Bio-PA were systematically characterized here. Multiple Pb(II)-affinitive molecular fragments (phenolic hydroxyl , tertiary amine and amide) were integrated into the structure of Bio-PA. Based on this, the application of Bio-PA as “enrichment-type” Pb(II) electrochemical probe was explored subsequently. The results showed that the introduction of Bio-PA significantly improved the response of Pb(II), and the modified electrode (Bio-PA/Nafion/GCE) illustrated satisfactory detection sensitivity and selectivity.
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ELECTROANALYSIS
·
2020
·Vol. 33
·期 4
·947-955
·
IF 2.544
Yanqiu Fu,Jinrui Li,Wei Jin,Zhonggang Liu
In this work, a dual-functional electrochemical sensor has been proposed based on Sn-doped defective Bi 2 S 3 (TDDB) microspheres, which exhibited the excellent electrochemical performance on Pb(II) and H 2 O 2 detection. The TDDB offered a satisfied detection limit of 8.0 nM towards Pb(II) with a sensitivity of 96.7 μA ⋅ μM −1 . As a H 2 O 2 sensor, a high sensitivity of 3540 μA mM −1 cm −2 was obtained in a linear range from 0.45 mM to 10 mM with a detection limit of 10 nM. Moreover, the electrochemical detection of Pb(II) in Taihu Lake and H 2 O 2 in human serum was achieved with high reliability and good recovery.
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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.
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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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CHEMICAL ENGINEERING JOURNAL
·
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.
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