ChemNanoMat
·
2022
·Vol. 8
·期 12
·e202200419
·
IF 3.82
Bo Zhu,Xu Lu,Lianglu Hu,Qiang Zhang,Lifei Wang,Yun Zheng,Jianfeng Fan
In this work, we focused on the matrix material with a composition of Mg 3 Sb 1.8 Bi 0.2 . The effect of Pb doping on the thermoelectric properties of Mg 3 Sb 1.8-y Bi 0.2 Pb y (y=0, 0.005, 0.01, 0.02) compounds was investigated. Mechanical alloying followed by spark plasma sintering was employed to synthesize the corresponding bulk materials. The x-ray diffraction results indicate that the doping limit of Pb in Mg 3 Sb 1.8 Bi 0.2 is 0.01∼0.02. Pb doping significantly increases the carrier concentration up to >10 19 cm −3 , while decreasing the Seebeck coefficient. Moreover, the thermal conductivity of the matrix material is reduced upon Pb doping at 400–700 K. As a result, the thermoelectric figure of merit is improved in the low-temperature range, and a ZT value of 0.039 is obtained for the y=0.005 sample at 500 K, which is 77% higher than that of the undoped sample.
研究领域:
材料科学
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热电材料
·
固体物理
·
能源材料
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 1
·1-13
·
IF 3.8
Wang Degui,Xiao Qiuying,Xiao Yepeng,Cheng Lihua,Chen Hong,Chen Bing,Wang Suhua
Since lead is a non-biodegradable and neurotoxic heavy metal, efficient removal of Pb(II) from water is of great significance. Herein, a new type of functional cellulose with enriched thiourea groups (Thiourea-PC) was synthesized using the leaves of plumeria frangipani, a common agricultural solid waste, as the starting materials and applied for the efficient removal of lead ions from water. The properties of the cellulose-based adsorbent have been carefully analyzed and evaluated using FT-IR, SEM, XPS, and elemental analysis techniques. The results showed that the maximum adsorption capacity of Thiourea-PC was 173.92 mg/g under the optimal conditions. The adsorption mechanism was attributed to the complex reaction between Pb(II) and mercaptan/nitrogen-containing groups, and the adsorption process conformed to Langmuir isothermal adsorption model and Pseudo-second-order kinetic model. It is worth noting that after five cycles of adsorption–desorption, the removal rate of Pb(II) by Thiourea-pc was still high, reaching more than 97%, and it had been successfully applied to the simulated adsorption of actual water samples with excellent selectivity. Adsorbent precursors come from a wide range of sources, are economical and effective, and the resource utilization of biomass waste can be realized through sustainable synthesis.
研究领域:
环境科学
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材料科学
·
化学工程
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水处理技术
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吸附
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重金属去除
·
生物质利用
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高影响因子
TRANSITION METAL CHEMISTRY
·
2023
·Vol. 48
·期 1
·55-61
·
IF 1.7
Yang Yu-Meng,Feng Chao,Jiang Yun-Hua,Du Dao-Hang,Zhao Hong,Zhang Guo-Ning,Wang Yu-Cheng
Rigid, dicarboxylic acid ligand 5-(4-carboxyphenyl)-1 H -pyrazole-3-carboxylic acid (H 3 L) has been synthesized and utilized for assembling a metal organic framework [Pb 2 (HL) 2 ] n through the hydrothermal technique. The target complex has been described by single-crystal X-ray diffraction, powder X-ray diffraction measurement, elemental analysis and infrared spectroscopy, and proved to be a structurally novel 3D complex. The central metal ions Pb(II) of complex 1 are coordinated to the carboxyl oxygen atoms, possessing two different coordination modes, heptacoordination and octacoordination. In the case of topology, complex 1 exhibits a net topological structure of 2,3,9-c with Schläfi symbol of {3·5 2 }{3 2 ·4 4 ·5 12 ·6 14 ·7 2 ·8 2 }{5}. The optical properties have been undertaken at room temperature, showing attractive luminescence behavior. Moreover, the electrochemiluminescent intensity of complex 1 can reach up to 1056 a.u. and maintain relatively stable after eight cycles, which could further provide ideas for building organic light-emitting diodes (OLEDs) constructed with a more affordable metal center.
研究领域:
无机化学
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材料科学
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配位化学
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晶体学
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电化学
·
光学材料
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高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Jinyun Hong,Bochuan Yuan,Hanxiao Feng,Yuanyuan Song,Zhangyu Li,Ke Wang,Minting Wang,Hui Peng,Yiguang Jin
Lead poisoning remains a persistent global health challenge. Current small-molecule chelation therapies for lead poisoning cause systemic side effects due to non-specific metal depletion. Here, we propose an "affinity-selectivity-safety" strategy using a living biointerface in which the probiotic is programmed to overexpress customized curli nanofibers. The high-affinity Pb-binding protein PbrR was anchored onto the cell surface of Escherichia coli Nissle 1917 (EcN) via fusion to the curli nanofiber subunit CsgA and presented within the extracellular self-assembled curli network. After induction, EcNC-P overexpresses the C-P fusion protein, which self-assembles into a dense and stable network of PbrR-functionalized curli nanofibers on the bacterial surface, without impairing bacterial viability, intestinal transit properties, or intrinsic probiotic functions. The engineered probiotics exhibited an exceptional Pb2+ binding capacity of up to 70 mg·g-1 biomass and preferential Pb selectivity over essential metals under competitive conditions. The curli-displayed PbrR provides an array of multidentate Pb2+-chelating sites, endowing the living material with an ultrahigh lead adsorption capacity. Orally ingested EcNC-P was completely excreted within 12 h, ensuring biosafety. In an acute oral Pb exposure mouse model, EcNC-P-based living materials achieved better efficacy than orally administered DTPA under the same dosing condition, reducing blood Pb levels by ∼30% and increasing fecal Pb excretion by ∼1.2-fold. Therapeutic supplementation of the probiotics promoted fecal lead excretion and markedly decreased tissue lead burdens and was associated with alleviated intestinal inflammation and altered gut microbiota composition. No systemic toxicity or adverse effects were observed with single high-dose use. This surface-anchored customized curli nanofiber probiotic integrates high-affinity lead chelation with the bioactivities of a living biointerface, offering a safe, oral, and programmable platform for the holistic management of lead poisoning.
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高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 6
·期 2
·1801200
·
IF 4.834
Yutian Wang,Hanjun Hu,Yufan Sun,Yang Tang,Liming Dai,Qing Hu,Adrian Fisher,Xiao Jin Yang
Nanostructure and crystallinity of transition metals play an important role in catalyzing carbon dioxide electroreduction (CO 2 ER) where Cu is a typical electrocatalyst with a wide variety of products and Pb has a high overpotential for H 2 evolution and is selective toward formic acid. In this study, 3D hierarchical nanostructures of Cu–Pb catalyst are prepared by a two-step electrodepositing–annealing–electroreduction approach (EAE). Cu nanowires (Cu NWs) of 200–400 nm diameter are built on the surface of commercial nickel foam substrates through an EAE step. Then, Pb nanoparticles with diameter of 5–10 nm are uniformly created on the surface of Cu NWs by a second EAE step. The nanostructural Cu–Pb electrodes catalyze CO 2 ER at a current density of −9.35 mA cm −2 (at −0.93 V vs reversible hydrogen electrode (RHE)). The H 2 evolution is suppressed by 35.6% and CO and HCOOH are enhanced by 29.6% and 9.2%, respectively, as compared with Cu NWs. The protocol proposed in this study provides a simple and straightforward approach for preparing high-performance, hierarchical nanostructures of Cu–Pb bimetal catalyst for CO 2 ER.
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高影响因子
Microstructures
·
2026
·Vol. 6
·期 2
·N
·
IF 8.5
Kai Li\u003Csup\u003E1,\u003C\u002Fsup\u003E,Qian Wang\u003Csup\u003E2,\u003C\u002Fsup\u003E,Yiqiao Zhou\u003Csup\u003E3\u003C\u002Fsup\u003E,Zehui Yang\u003Csup\u003E1\u003C\u002Fsup\u003E,Zuwen Zeng\u003Csup\u003E1\u003C\u002Fsup\u003E,Yihui An\u003Csup\u003E1\u003C\u002Fsup\u003E,Lang Bian\u003Csup\u003E2\u003C\u002Fsup\u003E,Zhenting Zhao\u003Csup\u003E1\u003C\u002Fsup\u003E,Haijuan Mei\u003Csup\u003E1\u003C\u002Fsup\u003E,Duoduo Zhang\u003Csup\u003E1\u003C\u002Fsup\u003E,Weiping Gong\u003Csup\u003E1\u003C\u002Fsup\u003E,Xudong Qi\u003Csup\u003E4\u003C\u002Fsup\u003E,Limei Zheng\u003Csup\u003E5\u003C\u002Fsup\u003E
To meet the escalating demands for high-performance piezoelectric materials in fields such as modern medical diagnostics, precision manufacturing, etc., we developed a ternary 0.555Pb(Ni1/3Nb2/3)O3-0.145PbZrO3-0.30PbTiO3 (PNN-PZ-PT) piezoelectric ceramic located at the tricritical point of rhombohedral, tetragonal and pseudocubic phases. This ceramic, with coexistence of multiple ferroelectric phases, demonstrates an ultrahigh piezoelectric coefficient d33 of 1190 picocoulombs per newton (pC/N) and a large relative dielectric constant εr of 9900. Analysis of the domain structure reveals irregular maze-like nanodomains with strong local disorder. These nanodomain structures exhibit excellent local piezoelectric response and polarization switching characteristics, thereby enhancing the alignment of polarization vectors during poling and ensuring the high stability after being poled. The tricritical point composition with disordered nanodomains can significantly enhance the contribution of polarization to macroscopic piezoelectric properties, offering a promising approach for developing ceramics with superior piezoelectricity.
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DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Zhihui Wang,Peisen Huang,Yanghao Yan,Yu Tao,Wu Lei,Mingzhu Xia,Fengyun Wang
Heavy metals and dyes present in industrial wastewater pose a significant threat to both the ecological environment and human health. In this study, we have developed a multifunctional adsorbent, SEP/PR, which is obtained by modifying sepiolite with polyrhodanine. The purpose of this adsorbent is to effectively remove Pb 2+ ions and Congo red (CR) dye from contaminated water sources. The adsorbents were systematically characterized using SEM, EDS, XRD, BET, FT-IR and XPS. Compared with raw sepiolite, SEP/PR exhibited better adsorption performance due to its abundant adsorption sites. The adsorption of Pb 2+ and CR on SEP/PR can be described by pseudo-second-order and Langmuir models, and the preferential adsorption capacities were still satisfactory even in the presence of interference. The maximum adsorption of Pb 2+ and CR was 423.29 mg/g and 894.76 mg/g, respectively, at 298 K. It is noteworthy that the removal rates of both Pb 2+ and CR were increased in the binary Pb 2+ -CR system. These observed increases can be attributed to the introduction of additional adsorption sites, as well as the electrostatic attractions that occur between the adsorbed Pb 2+ (+) and CR (−) ions. The adsorption mechanism for Pb 2+ primarily involves complexation, while for CR, it involves a combination of electrostatic interactions, hydrogen bonding, and π-π interactions. Finally, SEP/PR has good reusability and practical application capabilities. This study shows that SEP/PR is simple to synthesize and can be used for the synergistic removal of heavy metals and dyes in complex systems.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 28
·72354-72367
·
IF 5.8
Zhou Tao,Lu Linghong,Tao Suwan,Ma Yi
In this work, we synthesized activated alumina biochar composites (γ-Al 2 O 3 /BC) by sol–gel method, which improved the problem that the surface charge of γ-Al 2 O 3 was not conducive to the removal of heavy metal cation in a neutral solution, and then explored the feasibility of removing Pb(II) by γ-Al 2 O 3 /BC as well as reusing Pb-laden waste sludge to remove phosphorus (P) and its micro-adsorption mechanisms. The results show that the maximum adsorption capacity of γ-Al 2 O 3 /BC for Pb(II) is 182.48 mg/g, and the removing capacity of recycled Pb-laden slag for P also reaches 87.13 mg/g. It was found that the presence of Pb in the slag makes P removal more effective. In addition, in the process of P removal, the Pb in the slag will not be released, which will not cause secondary pollution to the water. The micro-adsorption mechanism of Pb(II) and P on the composites was investigated by XPS, XRD, and FTIR. It demonstrates that special functional groups such as hydroxy-aluminum, hydroxyl, and carboxyl groups can remove Pb(II) through strong surface complexation and electrostatic attraction. Furthermore, the removal mechanism of P from Pb-laden sludge includes chemisorption and complexation, and the precipitation of P and Pb on the adsorbent surface is the main reason for the removal of P. Therefore, it is feasible to further effectively remove P by using the waste biochar containing Pb. The idea of this paper provides a potential method for the reuse of waste adsorbent.
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DOI
PubMed
高影响因子
AIP Advances
·
2019
·Vol. 9
·期 2
·
IF 1.579
Wang Xiaohong,Wang Gang,Marchetti Alessandro,Wu Lin,Wu Laxia,Guan Yebin
Porous hydroxyapatite (HA) matrices with high porosity were prepared through a high temperature sintering method by using HA powder as raw material, polystyrene (PS) microspheres as pore-forming agents and polyvinyl alcohol (PVA) solution as adhesive. The characterization of HA was carried out by a series of techniques including XRD, FT-IR, FESEM and BET, and showed that the morphology and structure of porous HA material were closely related to the amount of PS and PVA. The adsorption capability for Cu 2+ , Cd 2+ and Pb 2+ in aqueous solution showed that the porous HA possessed a selective and strong uptake of Pb 2+ ions and the adsorption efficiency reached 99.8% in 10 min.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Tao Li,Shaoyu Lü,Shaofei Zhang,Chunmei Gao,Mingzhu Liu
Excessive application of fertilizers and their losses have exerted a great threat on soil environment. Slow- or controlled-release fertilizers have been widely produced to alleviate the problem. However, most of them can not remedy contaminated soil environment, and even make it worse. To improve nutrient use efficiency and reduce soil environmental pollution, lignin, an extensive biomass source, was used to synthesize a lignin-based superabsorbent (LPA), which was then introduced into the fertilizer as an outer coating material to obtain lignin-based multifunctional fertilizer (LMF). Results showed that the introduction of LPA can improve water-holding and water-retention capacity of soil and nutrients release behavior of fertilizers. The cumulative release rates of nitrogen, phosphorus and zinc were 79.5%, 46.7% and 60.1% after 25 days, respectively. Additionally, LMF can efficiently immobilize and restrict the migration of bivalent lead (Pb(II)) by complexation with lignin. About 91.7% of Pb(II) was immobilized after soil-sand mixture with Pb(NO 3 ) 2 was treated by LMF. The pot experiments indicated that the LMF exhibited a positive effect on the growing of corn in Pb(II)-contaminated soil. Therefore, this work provides a promising fertilizer to improve the utilization efficiency of water, sustained release of nutrients, and immobilization of Pb (II) in contaminated soil.
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DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2017
·
IF 0.754
Ting Guo,Chaoke Bulin,Bo Li,Zhiwei Zhao,Huitao Yu,He Sun,Xin Ge,Ruiguang Xing,Bangwen Zhang
Partially reduced graphene oxide-Fe3O4 composite was prepared through in situ co-precipitation and used as an efficient adsorbent for removing Pb(II) from water. The composites were characterized by X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectra, Fourier transformation infrared, Raman spectrometer, N2 adsorption–desorption, vibrating sample magnetometer, and zeta potential analyses. The impacts of pH, contact time, adsorbent dosage, temperature, and foreign substances on Pb(II) adsorption performance were investigated. The adsorption mechanism, kinetics, and thermodynamics were analyzed. The results indicate that Fe3O4 is homogeneously anchored inside the thin graphene sheets, with a particle size of 15–20 nm, resulting in a very low remanence and coercivity. The composite shows excellent and efficient adsorption performance toward aqueous Pb(II): adsorption equilibrium was reached in 10 min with the adsorption percent and quantity of 95.77% and 373.14 mgċg−1, respectively, under a condition of pH = 6, adsorbent dosage 250 mgċL−1, and Pb(II) initial concentration 97.68 mgċL−1, with the subsequent magnetic separation taking only 10 s. The adsorption performance is dependent on adsorbent dosage. A lower dosage favors a higher adsorption quantity, implying a strong adsorptive potential for partially reduced graphene oxide-Fe3O4. The adsorption quantity reached 777.28 mgċg−1, given the dosage 100 mgċL−1. The adsorption is monolayer chemisorption, the whole process of which is controlled by chemisorption and liquid film diffusion. In terms of thermodynamics, the adsorption is an exothermic and spontaneous process.
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高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Shu-Cui Ma,Ji-Lin Zhang,De-Hui Sun,Gui-Xia Liu
Removal of noxious heavy metal ions (e.g. Pb(II)) by surface adsorption of minerals (e.g. diatomite) is an important means in the environmental aqueous pollution control. Thus, it is very essential to understand the surface adsorptive behavior and mechanism. In this work, the Pb(II) apparent surface complexation reaction equilibrium constants on the calcined diatomite and distributions of Pb(II) surface species were investigated through modeling calculations of Pb(II) based on diffuse double layer model (DLM) with three amphoteric sites. Batch experiments were used to study the adsorption of Pb(II) onto the calcined diatomite as a function of pH (3.0–7.0) and different ionic strengths (0.05 and 0.1 mol L −1 NaCl) under ambient atmosphere. Adsorption of Pb(II) can be well described by Freundlich isotherm models. The apparent surface complexation equilibrium constants (log K ) were obtained by fitting the batch experimental data using the PEST 13.0 together with PHREEQC 3.1.2 codes and there is good agreement between measured and predicted data. Distribution of Pb(II) surface species on the diatomite calculated by PHREEQC 3.1.2 program indicates that the impurity cations (e.g. Al 3+ , Fe 3+ , etc.) in the diatomite play a leading role in the Pb(II) adsorption and dominant formation of complexes and additional electrostatic interaction are the main adsorption mechanism of Pb(II) on the diatomite under weak acidic conditions.
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高影响因子
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