JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2019
·Vol. 102
·期 10
·5989-5996
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IF 3.094
Yue-Xing Chen,Kang-Di Shi,Fu Li,Xiao Xu,Zhen-Hua Ge,Jiaqing He
In recent years, BiCuSeO oxyselenides have been developed as a promising thermoelectric material. In this article, Pb x Bi 1− x Cu 1− y SeO ( x = y = 0, 0.02, 0.04, 0.06, and 0.08) are prepared by solid-state reaction method and spark plasma sintering (SPS), and the combinatorial effects of Pb doping and Cu deficiencies on thermoelectric properties are investigated systematically. The transport properties are significantly enhanced due to the optimized carrier density, majorly contributing to the promotion of ZT values. As a result, the maximum ZT of 0.77 at 873 K and average ZT (from 300 to 873 K) of 0.50 are obtained for Pb 0.06 Bi 0.94 Cu 0.94 SeO sample. The values are 0.4 and 1.2 times, respectively, higher than that of pristine sample.
研究领域:
材料科学
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热电学
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陶瓷
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能量转换
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 16
·5119-5126
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IF 4
Liubing Fan,Shiqiang Hao,Shihui He,Xusheng Zhang,Mingyang Li,Christopher Wolverton,Jing Zhao,Quanlin Liu
Organic–inorganic hybrid metal halides have been extensively studied because of their great potential in optoelectronics. Herein, we report three hybrid metal halides (Bmpip)2ZnBr4, (Bmpip)2CdBr4, and (Bmpip)8Pb11Br30 (where Bmpip+ is 1-butyl-1-methyl-piperidinium, C10H22N+). (Bmpip)2ZnBr4 and (Bmpip)2CdBr4 crystallize in the P21/c space group with zero-dimensional crystal structures with [MBr4]2− (M = Zn, Cd) tetrahedra isolated by Bmpip+. (Bmpip)8Pb11Br30 crystallizes in the triclinic space group P with one-dimensional corrugated chains constructed from face-sharing [PbBr6]4− octahedra. All of the compounds exhibit excellent ambient and thermal stability. Under UV excitation, all three compounds exhibit very broad emissions. Temperature-dependent photoluminescence measurements indicate that the broad emissions of (Bmpip)2ZnBr4 and (Bmpip)2CdBr4 can be attributed to both the organic cations and self-trapped excitons (STEs) and that the emission of (Bmpip)8Pb11Br30 is assigned to STEs. Density functional theory calculations reveal that the three compounds adopt a direct band gap. This work enriches our understanding of the structure types of hybrid metal halides while revealing their diverse emission mechanisms.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yaqin Rong,Wenjun Yan,Zhongde Wang,Xiaogang Hao,Guoqing Guan
The slow accumulation of heavy metal in the sediment and aquatic food chain, leads to extremely bad health influence in human body. Most of the traditional adsorption materials have deficient adsorption capacity and selectivity. In this research, the TiO 2 /PANI composite material is synthesized successfully by intercalating 2HT (intercalating agent) and PANI into the interlayer of the TiO 2 nanosheet for the separation of Pb 2+ . During this synthesis process, the layer spacing of TiO 2 /PANI can be controlled precisely by adjusting the concentration of 2HT and PANI. The rapid Pb 2+ uptake/ release process is triggered through turning the redox states of composite film which can leads to the conversion between Ti 4+ and Ti 3+ and the conversion between –OH and -O-Pb covalent bond for maintaining the electrical neutrality. In addition, the directional H + proton migration, fast electronic transporting network and superfast Pb 2+ ion transport path both are benefit for the transmission and uptake of Pb 2+ . As a result, this composite film illustrates ultrahigh uptake capacity (1499.99 mg∙g −1 ) and selectivity (K D = 15.2 L·g −1 ). It can even treat real wastewater to a level lower than WHO. Hence, this composite film with superior electrochemical performance is a promising material, which could be used for uptake/release of Pb 2+ .
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MOLECULES
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2023
·Vol. 28
·期 13
·5021
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IF 4.6
Xinlan Han,Jinhua Li,Siyu Tao,Guowei Dou,Sanawar Mansur,Xinqian Zhang
The specific structure and diverse properties of hybrid organic–inorganic perovskite materials make them suitable for use in photovoltaic and sensing fields. In this study, environmentally stable organic–inorganic hybrid perovskite luminescent materials using Pb–MOF as a particular lead source were prepared using a mechanochemical method. Based on the fluorescence intensity of the MAPbBr3/MOF composite, the mechanized chemical preparation conditions of Pb–MOF were optimized using response surface methodology. Then, the morphological characteristics of the MAPbBr3/MOF composite at different stages were analyzed using electron microscopy to explore its transformation and growth process. Furthermore, the composite form of MAPbBr3with Pb–MOF was studied using XRD and XPS, and the approximate content of MAPbBr3in the composite material was calculated. Benefiting from the increase in reaction sites generated from the crush of Pb–MOF during mechanical grinding, more MAPbBr3was generated with a particle size of approximately 5.2 nm, although the morphology of the composite was significantly different from the initial Pb–MOF. Optimal performance of MAPbBr3/MOF was obtained from Pb–MOF prepared under solvent-free conditions, with a milling time of 30 min, milling frequency of 30 Hz and ball–material of 35:1. It was also confirmed that the mechanochemical method had a good universality in preparing organic–inorganic hybrid perovskite/MOF composites.Keywords:Pb–MOF;organic–inorganic hybrid perovskite/MOF composites;mechanochemical method;optical properties
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Membranes
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2023
·Vol. 13
·期 7
·651
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IF 4.2
Lu Liu,Hongyang Ma,Madani Khan,Benjamin S. Hsiao
To achieve high throughput, low-pressure drops, and high adsorption capacity of Cr(VI) and Pb(II) in industrial wastewater treatment, cellulose membranes containing cationic and anionic groups were fabricated, respectively. In this process, cost-effective cotton fabrics were oxidized using sodium periodate, followed by quaternary ammonium or sulfonation modifications. The chemical composition, surface morphology, and thermal and mechanical properties of the cellulose membranes were investigated by ATR-FTIR, solid-state NMR, SEM, TGA, and tensile experiments. Quaternary ammonium, aldehyde, and sulfonate groups were distributed on the cationic/anionic cellulose fibers as adsorption sites, which issue remarkable adsorption capability to the cellulose membranes. The highly toxic Cr(VI) and Pb(II) ions were used to challenge the adsorption capacity of the cationic and anionic cellulose membranes, respectively. The maximum adsorption capacities of Cr(VI) and Pb(II) ions were 61.7 and 63.7 mg/g, respectively, suggested by Langmuir isotherms, kinetics, and thermodynamics in the static experiments. The dynamic adsorption capability of cationic cellulose membranes against Cr(VI) ions was determined and compared with that of commercially available anionic-exchange membranes. Spiral wound filtration cartridges were fabricated by cationic and anionic cellulose membranes, respectively, and were used to adsorb Cr(VI) and Pb(II) from lab-made wastewater, respectively. The cationic cellulose cartridge can purify 4.4 L of wastewater containing 1.0 mg/L of Cr(VI) ions with a 100% removal ratio, while the pressure drop was retained at 246 Pa. Similarly, the anionic cellulose cartridge exhibited even more impressive adsorption capability; the removal ratio against Pb(II) was 99% when 8.6 L of 1.0 mg/L of Pb(II) ions containing wastewater was treated, and the pressure drop was retained at 234 Pa. A composite cartridge fabricated by the integration of cationic and anionic cellulose membranes was successfully employed to purify the wastewater containing Cr(VI) and Pb(II) simultaneously. The possible adsorption mechanism was proposed, and the recycling ability of the cellulose membranes was also discussed.Keywords:cationic/anionic cellulose membrane;oxidation;adsorption;heavy metal ions;wastewater treatment
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Xiya Yang,Lingyuan Chen,Dong Ren,Shixing Wang,Zhaogang Ren
An O -hydroxyphenyl thiourea-modified chitosan ( OTCS ) with excellent Pb(II) adsorption performance and selectivity was prepared as an adsorbent. The structure and morphology of the adsorbent were systematically investigated by SEM, BET, FTIR, EDX , zeta-potential measurements, XPS and XRD. The impacts of the initial Pb(II) concentration, reaction time, temperature, pH value, and coexisting ions were explored. At pH 7 and 303 K, the maximal adsorption capacity of OTCS for Pb(II) was 208.33 mg/g, which was greater than those of other adsorbing materials reported in the literature. The metal ion adsorption kinetics and isotherm models were found to obey pseudo-second-order kinetics and the Langmuir isothermal model, indicating that the adsorption process was monolayer chemisorption. The adsorption process could proceed spontaneously, and the thermodynamic results revealed that the adsorption mechanism was an endothermic reaction. The ion exchange and chelation between the sulfur, nitrogen and oxygen groups on the adsorbent and lead ions endowed the material with excellent adsorption properties. Significantly, OTCS showed excellent selectivity toward Pb(II). Therefore, the adsorbent OTCS is expected to promote the wider application of chitosan in the adsorption of Pb(II).
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CARBOHYDRATE POLYMERS
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2022
·
IF 10.723
Weifeng Xu,Xiang Liu,Kewen Tang
A novel bi-functional β-cyclodextrin polymer (CD@TCT@PEI) was synthesized for the removal of hydroquinone and Pb(II) from wastewater. The structure and adsorption performance of CD@TCT@PEI towards hydroquinone and Pb(II) were studied comprehensively. Both of the adsorption processes fit the pseudo-second-order kinetic model well. The adsorption isotherms of hydroquinone and Pb(II) could be described well by Langmuir isotherm model, and the maximum adsorption capacities of hydroquinone and Pb(II) are 364.86 and 113.52 mg g −1 , respectively. The adsorption of hydroquinone and Pb(II) on CD@TCT@PEI is an exothermic and spontaneous process. The adsorbed CD@TCT@PEI could be regenerated easily, and can still maintain high adsorption performance after 5 cycles. The electrostatic interaction and coordination interaction account for the adsorption of Pb(II), and inclusion of cyclodextrin and hydrogen-bond interaction are responsible for hydroquinone adsorption. This study provides some insights to design an adsorbent that can simultaneously remove heavy metal ions and organic micropollutants from wastewater.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Zhigang Yang,Liangliang Zhu,Jiani Liu,Yongxu Cheng,Khor Waiho,Aqin Chen,Youji Wang
Microplastics may be potential vectors for environmental contaminants such as heavy metals in the aquatic ecosystem due to their highly hydrophobic surfaces and fugacity property. To investigate the combined effects of microplastics with Pb, we exposed juvenile Chinese mitten crabs Eriocheir sinensis to different Pb concentrations (0, 5 and 50 μg/L) combined with microplastics (0 and 400 μg/L) for 21 days to determine the Pb bioaccumulation, oxidative stress, lipid anabolism, and histopathology of hepatopancreas. In general, the results showed that compared to single Pb exposure, the combination of MPs and Pb significantly increased the bioaccumulation of Pb, activities/content of antioxidant biomarkers and lipid metabolism enzymes, and liver injury parameters in crabs, indicating MPs are potential vector of heavy metals and co-exposure exerts more severe effects on crabs. This study provides the insights into the oxidative defense and preliminary lipid anabolism of economic crustaceans in response to combined stress of Pb and MPs.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Zhen Huang,Chao Xiong,Lingri Ying,Welong Wang,Shixing Wang,Jing Ding,Jianfeng Lu
Lead ions in water have notorious effects on humans and environment. It is important to design an adsorbent with high adsorption capacity and reproducibility for efficiently removing Pb (II)ions from polluted water. Here, a novel Ti-based MOFs material (BDB-MIL-125(Ti)@Fe 3 O 4 ) was prepared by modifying NH 2 -MIL-125(Ti) with sulfhydryl and amino groups. Due to the large number of active sites, the maximum Pb (II) adsorption capacity of BDB-MIL-125(Ti)@Fe 3 O 4 was 710.79 mg/g at 25 °C and pH = 6 within 120 min corresponding to a maximum removal rate of 95.68%. The adsorbent also has extremely high selectivity and good cycling adsorption performance. The adsorption isotherms and kinetics agree with the Langmuir and the pseudo-second-order models, indicating that the process was chemisorption . Thermodynamic studies prove that spontaneous processes enhance Pb (II) adsorption at higher temperatures. DFT and FMOs calculations were used to discuss the adsorption mechanism. The sulfhydryl groups on the surface of organic ligands have a stronger affinity for Pb (II).
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Journal of Advanced Dielectrics
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2022
·
IF 0
Chuan Chen,Yan Wang,Jiajiu Li,Chaofeng Wu,Guanrong Yang
A series of (100 − x ) Pb(Mg 1 / 3 Nb 2 / 3 ) O 3 − x PbTiO 3 (PMN − x PT, x = 24, 25, 26) ceramics were prepared by solid-state reaction technique using MgNb 2 O 6 precursor. The results of the detailed characterizations reveal that the content of PT has negligible influence on the grain size, and all samples possess the perovskite structure. As the PT content increases, the samples changed from the normal ferroelectric phase to the ergodic relaxor state at room temperature. As a result, PMN– x PT ceramics are endowed with electro-strain of 0.08% at a relatively low electric field of 2 kV/mm, and effective piezoelectric coefficient of 320 pm/V was obtained. Simultaneously, the PMN– x PT ceramics have exceptional pyroelectric performance, exhibiting a high pyroelectric coefficient p ∼ 5.5 – 6.3 × 10 − 8 C⋅cm − 2 ⋅K − 1 . This study demonstrates the great potential of PMN– x PT for piezoelectric and pyroelectric device applications.
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Journal of Energy Storage
·
2021
·
IF 6.583
Jing Zhong,Jian Gu,Kai-da Zhu,Xin-ru Wang,Sen-lin Wang
Adding lead-carbon composite materials to the negative plate of lead-acid batteries can effectively improve the electrochemical performance of the battery . In this paper, a novel quasi-solid method is used to in-situ synthesize the nano-Pb/C composite as additives in the negative active material of lead-acid cells, which can greatly increase the utilization rate of negative active material and the initial discharge capacity of the lead-acid cell. Compared with the N C material, the nano-Pb/C composite effectively inhibits the hydrogen evolution reaction . In addition, since the nano-Pb/C composite and the negative active material in the negative plate form a porous framework, the diffusion of the electrolyte and the dissolution of PbSO 4 are accelerated. The cell containing 1 wt.% nano-Pb/C composite has the best cycle performance (18,154 cycles) under high-rate partial-state-of-charge condition. All in all, the nano-Pb/C composite prepared via a new quasi-solid method has the advantages of improving the initial capacity and lifespan of lead-acid batteries, and it is a promising candidate material for lead-acid battery additives.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Hangxi Liu,Haorong Sun,Ming Fang,Yifeng Zhang,Mingguang Kong,Zhimin Lv,Xiaoli Tan
The evaluation of the concentration of Pb(II) in solution has great significance in avoiding harm to ecology health. In this work, NH 2 -MIL-53(Fe) modified ITO glass (NH 2 -MIL-53(Fe)@ITO) was utilized as an electrochemical sensor for the detection of Pb(II) in solutions. FTIR and XPS investigation disclosed that the plentiful surface –NH group on the NH 2 -MIL-53(Fe) should be responsible for the highly efficient and selective detection abilities of Pb(II) due to the capture and conductivity abilities. The NH 2 -MIL-53(Fe) was prepared by a solvothermal technique and electrophoresed on the surface of ITO glass . A square wave voltammetry (SWV) method is employed for the sensitive determination of Pb(II). The factors of the detection condition such as the pH and ion interference are also studied. The sensitivity of 16.072 μA μM −1 cm −2 in the linear range of 2–4 μM and 54.143 μA μM −1 cm −2 in the linear range of 5–17 μM, and the limit of detection (LOD) of 0.1 μM are acquired. The repeatability and reproducibility are also studied. EIS and Tafel curves are utilized to investigate the effect of temperatures on the properties of the NH 2 -MIL-53. This work presents a facile strategy for the preparation of NH 2 -MIL-53(Fe)@ITO electrochemical sensor via electrolysis, which enhances the sensitivity toward Pb(II) and shows great application potential.
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