APPLIED SURFACE SCIENCE
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2017
·
IF 3.387
Dan Lv,Yu Liu,Jiasheng Zhou,Kunlun Yang,Zimo Lou,Shams Ali Baig,Xinhua Xu
In this study, a novel bamboo activated carbon (BAC) with ethylene diamine tetraacetic acid (EDTA) functionality was prepared by direct grafting in the presence of tetraethyl orthosilicate (TEOS) as a crosslinking agent. The BAC@SiO 2 -EDTA was characterized by SEM, TEM, TGA, FTIR, XPS and its adsorption property for removal of Pb(II) and Cu(II) under various experimental conditions was also investigated. The characterization results reflected that EDTA was successfully assembled on the surface of the BAC and average pore size increased from 4.10 to 4.83 nm as BAC grafted with EDTA. Adsorption data fitted very well in Langmuir isotherm model and pseudo-second-order kinetic model. As compared with the raw BAC, the maximum adsorption capacities of BAC@SiO 2 -EDTA for the Pb(II) and Cu(II) increased from 45.45 to 123.45 mg g −1 and from 6.85 to 42.19 mg g −1 , since the existence of EDTA on modified BAC promoted the formation of chemical complex. The removal of heavy metal ions mainly depended on the complexation with EDTA and the electrostatic attractions with negatively charged surface of BAC@SiO 2 -EDTA. The adsorption of Pb(II)/Cu(II) on the BAC@SiO 2 -EDTA was pH dependent and pH 5–6 was considered an optimum. However, lower temperature favored the adsorption and the maximum adsorption was recorded at 20 °C. In addition, BAC@SiO 2 -EDTA had an excellent reusability with about 40% decline in the adsorption capacity for Pb(II) after fifth reuse. Insignificant influences of co-existing cations and natural organic matter (NOM) were found on the adsorption of Pb(II) and Cu(II). All the results demonstrate that BAC@SiO 2 -EDTA is a potential adsorbent for metal ions in wastewater.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 46
·45431
·
IF 1.86
Ya Liu,Peng Qian,Yang Yu,Li Xiao,Yongliang Wang,Shufeng Ye,Yunfa Chen
Heavy metal ions such as Cu 2+ and Pb 2+ impose a significant risk to the environment and human health due to their high toxicity and non-degradable characteristics. Herein, Al(OH) 3 -polyacrylamide chemically modified with dithiocarbamates (Al-PAM-DTCs) was synthesized using formaldehyde, diethylenetriamine, carbon disulfide, and sodium hydroxide for rapid and efficient removal of Cu 2+ and Pb 2+ . The synthesized adsorbent was characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis, scanning electron microscopy–energy dispersive X-ray spectroscopy analysis, and transmission electron microscope measurements. Al-PAM-DTCs showed rapid removal of Cu 2+ (<30 min) and Pb 2+ (<15 min) with high adsorption capacities of 416.959 mg/g and 892.505 mg/g for Cu 2+ and Pb 2+ respectively. Al-PAM-DTCs also had high capacities in removing suspended solids and metal ions simultaneously in turbid bauxite suspensions. FTIR, thermodynamic study, and elemental mapping were used to determine the adsorption mechanism. The rapid, convenient, and effective adsorption of Cu 2+ and Pb 2+ indicated that Al-PAM-DTCs has great potential for practical applications in purification of other heavy metal ions from aquatic systems. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45431.
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RSC Advances
·
2017
·Vol. 7
·期 61
·38350-38359
·
IF 3.108
Xuan Jiao,Lingyan Zhang,Yangshuai Qiu,Yunru Yuan
In this study, sulfonated expanded graphite (SEG) was prepared through a mechanochemical method between EG, N,N-dimethylformamide, and a sulphur trioxide pyridine complex. XRD, XPS, FT-IR, BET, SEM-EDS, and zeta potentials were used to assess the characterizations of SEG. Thereafter, the effects of pH, adsorbent dosage, initial concentration, temperature, and contact time on adsorption performances were investigated. Results demonstrated that SEG shows superior adsorption properties to remove Pb(II) with high efficiency, and the removal capacity reached 325.12 mg g−1. The Langmuir model fit the equilibrium data better than either the Freundlich model or the Temkin model. Based on kinetic experiments, the adsorption of Pb(II) with SEG was perfectly described by a pseudo-second order kinetics model. According to thermodynamic parameters, the adsorption process was endothermic and spontaneous. Adsorption–desorption results showed a superior regeneration and cyclic performance of SEG as well. In addition, results of the adsorption mechanism indicated that the sulfonated functional groups played a significant role during the adsorption process.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Yu Du,Yaqi Xu,Jiongrui Hou,Xueling Li,Jing Yang,Jingqin Yang,Shaoyun Shan,Chengxiao Wang,Hongying Su
Adsorbents with high adsorption capacity, selectivity, and antioxidant activity are crucial to enhance the efficacy and prognosis of hemoperfusion treatments for patients with lead poisoning. This study presents the development of polyphenol-analogous dextran hydrogels (PYG@Dex) with abundant chemically conjugated pyrogallol (PYG) groups on their networks, which were prepared by Hantzsch cross-linking reaction involving the formation of 1,4-dihydropyridine from acetoacetylated dextran, 3,4,5-trihydroxybenzaldehyde, and NH 4 OAc. The resulting PYG@Dex hydrogel exhibited superior biocompatibility and robust antioxidant capabilities, achieving a free radical scavenging rate of over 90 %. Notably, the hydrogel with high PYG content displayed an outstanding adsorption capacity of 102.35 mg·g −1 for Pb 2+ ions, due to the coordination interactions with PYG and β -ketoester groups. The adsorption affinity of PYG@Dex for Pb 2+ ions was confirmed in the presence of biologically-relevant metal ions (K + , Na + , Ca 2+ , and Mg 2+ ) in both aqueous solutions and simulated plasma. These findings underscore the potential of PYG-conjugated hydrogels to address the challenges of selective heavy metal removal from blood through hemoperfusion and to provide additional protection against heavy metal-induced oxidative stress responses.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Fang-Fei Shi,Ling-Xin Kong,Wei-Zhun Dong,De-Zhong Cao,Gang-Jin,Ying Liang,Kun-Shan Yang
Post-modification of metal-organic framework (MOF) materials is an effective means to enhance their efficient and selective adsorption for heavy metal ions . In this article, we presented a reflection-type optical fiber surface plasmon resonance (SPR) sensor based on dual core fiber (DCF) coated with UiO-66-RSA (UiO-66-NH 2 post-modified with resorcinol aldehyde) film for the specific detection of Pb(II) in aqueous media . The composite material UiO-66-RSA exhibits stronger affinity and specificity for Pb(II) than UiO-66-NH 2 . The adsorption of Pb(II) can change the equivalent refractive index (RI) of UiO-66-RSA film, causing a regular shift in SPR spectra. Experiments have shown that the limit of detection (LOD) of the SPR Pb(II) sensor can reach 0.1 nM. Meanwhile, research has found that the SPR sensor is accompanied by temperature crosstalk of 0.356 nm/°C. Therefore, we constructed a Michelson temperature interferometer using polymer micro tips on the end face of the fiber core to achieve temperature compensation. Based on the above two sensing channels, dual parameter demodulation of Pb(II) concentration and temperature can be achieved with an error rate of less than 0.5 %. This article has potential research value in exploring the application of post modification techniques of MOF in fiber optic lead ion detection.
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Reaction Chemistry & Engineering
·
2025
·
IF 3.1
Zihao Bu,Kuo Zhou,Jialin Xu,Yuhao Wu,Shengrong Guo
The sustainable production of carbamates from biomass-derived molecules provides a viable alternative to petrochemical-based production routes. In this work, we reported an efficient catalytic strategy for synthesizing bio-based furfurylmethyl carbamate (FMC) through methoxycarbonylation of furfurylamine with dimethyl carbonate (DMC) under mild conditions. A novel Pb-Ni composite oxide catalyst with high activity and stability was developed, which significantly outperformed conventional monometallic oxide catalysts. Comprehensive characterization revealed that the synergistic interaction between Pb and Ni species constructed composite oxide nanoparticles (about 11.4 nm), with Pb species highly dispersed on the NiO matrix. Consequently, highly defective structure, abundant acid-base dual sites, and a high specific surface area were concurrently formed, which were identified as critical factors for activating both nucleophilic and electrophilic reactants. Significantly, appreciable quantities of furfuryl isocyanate were detected, demonstrating the feasibility of a one-pot cascade synthesis of bio-based isocyanates from amines and DMC.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Liang Cao,Jiajia Wang,Feifan Hu,Huihui Liu,Jian Guo,Haoran Yu,Mingyuan Yan,Ji Zhang,Feifei Wang,Yiping Wang,Shan-Tao Zhang
In this work, based on the lanthanide rare earth Sm3+ doped 0.2Pb(Mg1/3Nb2/3)O3-(0.8-x)PbZrO3-xPbTiO3:0.015Sm ceramics with a rhombohedral-tetragonal morphotropic phase boundary (MPB) around x = 0.40, we gradually introduced alkaline earth Ba2+ and Sr2+ at the A-site to substitute Pb2+, namely, 0.2A(Mg1/3Nb2/3)O3-0.4AZrO3-0.4ATiO3:0.015Sm (A = Pb0.99-yBa0.01Sry) and conducted a systematic study on their phase structure, domain configuration, and electrical properties. The results indicate that without alkaline earth substituting, the MPB composition shows peak electrical property with piezoelectric coefficient d33 = 477 pC/N and electromechanical coupling factor kp = 0.59, while an appropriate amount of alkaline earth substituting changes the MPB from rhombohedral–tetragonal coexisting phases to rhombohedral–monoclinic–tetragonal coexisting phases, leading to a significant enhancement in electrical properties with d33 = 687 pC/N and kp = 0.63 around y = 0.03 for comparison. This work classifies the mechanism for alkaline earth substituting enhanced piezoelectric performance and may provide a guide for the development of high-performance lead-based relaxor ferroelectrics.
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PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 15
·3699
·
IF 4.2
Shefeng Li,Qi Zheng,Xiaodan Liu,Peng Liu,Long Yu
Studying efficient and accurate soil heavy-metal detection technology is of great significance to establishing a modern system for monitoring soil pollution, early warning and risk assessment, which contributes to the continuous improvement of soil quality and the assurance of food safety. Laser-induced breakdown spectroscopy (LIBS) is considered to be an emerging and effective tool for heavy-metal detection, compared with traditional detection technologies. Limited by the soil matrix effect, the LIBS signal of target elements for soil heavy-metal detection is prone to interference, thereby compromising the accuracy of quantitative detection. Thus, a series of signal-enhancement methods are investigated. This study aims to explore the effect of conductive materials of NaCl and graphite on the quantitative detection of lead (Pb) in soil using LIBS, seeking to find a reliable signal-enhancement method of LIBS for the determination of soil heavy-metal elements. The impact of the addition amount of NaCl and graphite on spectral intensity and parameters, including the signal-to-background ratio (SBR), signal-to-noise ratio (SNR), and relative standard deviation (RSD), were investigated, and the mechanism of signal enhancement by NaCl and graphite based on the analysis of the three-dimensional profile data of ablation craters and plasma parameters (plasmatemperature and electron density) were explored. Univariate and multivariate quantitative analysis models including partial least-squares regression (PLSR), least-squares support vector machine (LS-SVM), and extreme learning machine (ELM) were developed for the quantitative detection of Pb in soil with the optimal amount of NaCl and graphite, and the performance of the models was further compared. The PLSR model with the optimal amount of graphite obtained the best prediction performance, with an Rp that reached 0.994. In addition, among the three spectral lines of Pb, the univariate model of Pb I 405.78 nm showed the best prediction performance, with an Rp of 0.984 and the lowest LOD of 26.142 mg/kg. The overall results indicated that the LIBS signal-enhancement method based on conductive materials combined with appropriate chemometric methods could be a potential tool for the accurate quantitative detection of Pb in soil and could provide a reference for environmental monitoring.
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Inorganics
·
2025
·Vol. 13
·期 9
·295
·
IF 3
Shengcong Wu,Qiu Xiong,Abd. Rashid bin Mohd Yusoff,Peng Gao
Regulating the crystallization dynamics of perovskite films is key to improving the efficiency and operational stability of (FA0.83MA0.17Cs0.05)Pb(I0.85Br0.15)3perovskite solar cells (PSCs). However, precise regulation of the crystallization process remains challenging. Here, we introduce a reactive anti-solvent strategy based on the Kornblum reaction to modulate crystallization via in-situ chemical transformation. Specifically, trans-cinnamoyl chloride (TCC) is employed as a single-component anti-solvent additive that reacts with dimethyl sulfoxide (DMSO) in the perovskite precursor solution. The resulting acylation reaction generates carbonyl-containing products and sulfur ions. The carbonyl oxygen coordinates with Pb2+ions to form Pb–O bonds, which retard rapid crystallization, suppress heterogeneous nucleation, and facilitate the growth of larger perovskite grains with improved film uniformity. Additionally, the exothermic nature of the reaction accelerates local supersaturation and nucleation. This synergistic crystallization control significantly enhances the film morphology and device performance, yielding a champion power conversion efficiency (PCE) of 23.02% and a markedly improved fill factor (FF). This work provides a new pathway for anti-solvent engineering through in-situ chemical regulation, enabling efficient and scalable fabrication of high-performance PSCs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jinglong Fan,Xiangyu Meng,Qinghu Guo,Zhonghua Yao,Hanxing Liu,Hua Hao
The development of piezoelectric ceramics combining high piezoelectric response with excellent temperature stability has become increasingly crucial for advanced applications. In this work, the relaxor ferroelectric Pb(In 1/2 Nb 1/2 )O 3 was incorporated into BiScO 3 -PbTiO 3 system and successfully synthesized as 0.05Pb(In 1/2 Nb 1/2 )O 3 -(0.95- x )BiScO 3 - x PbTiO 3 (PIN-BS- x PT) ceramics by the conventional solid-state reaction. Systematic characterization of phase structure, microstructure and electrical properties reveals the formation of a morphotropic phase boundary at x = 0.59, which exhibits optimal electromechanical properties with piezoelectric coefficient d 33 = 522 pC/ N, Curie temperature T C = 402 °C and planar electromechanical coupling coefficient k p = 0.56. Remarkably, the PIN-BS-0.59PT ceramic demonstrates remarkable performance stability, achieving both high strain response (0.12 % at 20 kV/cm) and minimal temperature-dependent variation (13.5 % between 30 and 200 °C). Furthermore, the PIN-BS-0.59PT ceramic retains ～90 % of its initial d 33 value after annealing at 300 °C, demonstrating exceptional thermal depolarization resistance. These findings position PIN-BS- x PT ceramics as promising candidates for high-temperature piezoelectric applications.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Honglei Wang,Zixuan Tian,Zhuang Fu,Lijun Zhao,Lei Wang,Songtao Dong,Hongbo Ju
Cu 3 SbSe 4 has garnered significant attention due to its low thermal conductivity, complex elemental composition, and economic feasibility. In this study, Cu 2.85 Ag 0.15 Sb 0.985−x Bi 0.015 Pb x Se 4 (x=0, 0.05, 0.10, and 0.15) samples were synthesized using a system of vacuum melting combined with cold isostatic pressing techniques. The impact of Pb doping on the thermoelectric properties of Cu 2.85 Ag 0.15 Sb 0.985 Bi 0.015 Se 4 was comprehensively investigated. The experimental results revealed a notable increase in carrier concentration, from 2.95×10 18 cm −3 to 8.31×10 19 cm −3 , leading to a substantial improvement on the electrical conductivity. At 573 K, the electrical conductivity of the Cu 2.85 Ag 0.15 Sb 0.835 Bi 0.015 Pb 0.15 Se 4 reached 234.26 S cm −1 , while the power factor of the Cu 2.85 Ag 0.15 Sb 0.885 Bi 0.015 Pb 0.10 Se 4 achieved a maximum value of 883.5 μW m −1 K −2 . The incorporation of Pb induced lattice defects, which modified the phonon mean free path and enhanced phonon scattering. As a result, the increased phonon scattering contributed to a reduction in lattice thermal conductivity within the Cu 2.85 Ag 0.15 Sb 0.985 Bi 0.015 Se 4 sample. The thermoelectric figure of merit (ZT) for the Cu 2.85 Ag 0.15 Sb 0.935 Bi 0.015 Pb 0.05 Se 4 reached a peak value of approximately 0.74 at 573 K, marking a 157.4% improvement compared to that of Cu 2.85 Ag 0.15 Sb 0.985 Bi 0.015 Se 4 (∼0.47). This study demonstrates that multi-element doping is a highly effective strategy for optimizing the thermoelectric properties of the Cu 3 SbSe 4 system.
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LANGMUIR
·
2018
·
IF 3.789
Ya-Ping Wang,Peng Zhou,Shi-Zhong Luo,Xue-Pin Liao,Bin Wang,Qian Shao,Xingkui Guo,Zhanhu Guo
Polymer/inorganic nanocomposites exhibit special properties due to highly intimate interactions between organic and inorganic phases and thus have been deployed for various applications. Among them, nanocomposites with monolayer polymer coverage on the inorganic surface demonstrate the highest efficiency for applications. However, the controllable synthesis of the polymer monolayer in mesopores of inorganic substrates remains a challenge. In this study, poly(acrylic acid)/γ-alumina nanocomposites (PAA/alumina) were synthesized via the in situ polymerization of acrylic acid impregnated in mesopores of alumina. By applying the preneutralization of monomers, the polymerization was found to be highly controllable in generating monolayer PAA coverage. The formation of monolayers was verified by thermogravimetry, semiquantitative Fourier transform infrared spectroscopy, N2 adsorption–desorption, and Pb(II) adsorption. Alternatively, the organic loadings of PAA/alumina composite samples could be controlled in the range of 0.2 to 1.0 equiv of monolayer, together with the linearly correlated metal ion adsorption capacity. As calculated by the complexation model, one Pb(II) is combined with two carboxylate groups of PAA. The formation of the monolayer polymer inside mesoporous oxide channels represents a method for the development of highly promising functional nanocomposites.
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