Journal of Water Process Engineering
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2024
·
IF 6.3
Dawei Xiang,Hao Wang,Shixing Wang,Manying Zhu,Yuefeng Chen,Xiang Liu,Ping Li,Likang Fu
Covalent organic frameworks (COFs) are very promising adsorbent developed during recent years. Here, a COFs adsorbent (COF@HPLC) for efficient adsorption of lead is designed by post-modification. The adsorption properties were studied by batch adsorption. It is shown that pH 4 is the optimum value for the adsorption of Pb(II) by COF@HPLC. When the temperature is 25 °C, the maximum adsorption capacity of COF@HPLC reaches 251.37 mg/g. The fitting results of adsorption isotherm indicate that the process is a non-uniform adsorption in a single molecular layer . The activation energy fitted by the Dubinin-Radushkevich model are 16.22 kJ/mol, 21.32 kJ/mol, 18.87 kJ/mol and 16.67 kJ/mol, showing that Pb(II) adsorption by COF@HPLC is a chemical reaction. Kinetic studies show also that Pb(II) adsorption is a chemically controlled process. Thermodynamic shows that the adsorption is a spontaneously exothermic process. Finally, COF@HPLC has good adsorption selectivity and reusability. The adsorption mechanism of Pb(II) by COF@HPLC was the electrostatic and chelating interaction between functional groups containing sulphide and nitrogen and Pb(II) based on the zeta potential , XPS and DFT analyses. This work offers guidance toward the design and preparation of functional adsorbents for the treatment and removal of Pb(II).
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JOURNAL OF POWER SOURCES
·
2025
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IF 7.9
Xiaojing Dong,Jintao Wang,Yue Hao,Yiqiang Sun,Xu Zhang,Bo Xu,Cuncheng Li
Exploring oxygen evolution reaction (OER) electrocatalysts over a universal pH range to simultaneously achieve enhanced activity, improved stability and reduced cost is a rewarding yet challenging endeavor. Considering the hydrophilicity and electronegativity disparity between Pb and Ru, herein, a Pb doped RuO 2 catalyst and its application as electrocatalyst for OER under universal pH conditions are studied. Due to the modified hydrophilicity and electronic structure, the Pb 0.1 Ru 0.9 O 2 only requires an overpotential of 207 mV to obtain a current density of 10 mA cm −2 in acidic environment, and overpotentials of 232 mV and 363 mV are required in alkaline and neutral environments, respectively. Moreover, extensive stability assessments conducted over a 24-h period reveal remarkable stability of the catalyst in diverse environments, encompassing acidic, alkaline, and neutral conditions. Additionally, the utilization of density functional theory (DFT) computations offers persuasive evidence that the inclusion of Pb within RuO 2 can significantly alter its electronic configuration, thereby promoting efficient electron transfer processes. This modulation of the electronic structure is crucial for enhancing the catalytic performance of the material. This research paves the way for innovative designs of highly efficient oxygen evolution reaction (OER) catalysts, featuring minimized use of precious metals, heightened catalytic prowess, and unparalleled stability across a broad pH range.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Fuyang Huang,Jing Lin,Bin Wang,Quan Long,Weiguo Tu
Biochar was used to enrobe artificially synthesized mordenite by co-pyrolysis, and the performance of the composite in removing lead from dilute solutions was compared with that of the mordenite alone. The optimal parameters for the hydrothermal synthesis of mordenite were as follows: crystallization temperature of 180℃, crystallization time of 4 days, pH value of 11, and aging time of 24 h. The optimal mass ratio of mordenite to biochar was 20:1, and the pyrolysis temperature was 500℃. Adsorption equilibrium was reached within 3 h, yielding a total average lead removal of 78.9 % for mordenite alone and 98.6 % for the composite. Pseudo-second-order kinetics and Langmuir isotherms adequately described the data. The predicted maximum adsorption capacities were 156.6 mg/g for the mordenite alone and 283.4 mg/g for the composite. When the initial concentration of Pb(Ⅱ) was 80 mg/L, the optimum doses were determined to be 6–7 g/L for the mordenite and 5–6 g/L for the composite. At pH less than 7, mordenite removed up to 80 % of the lead and the composite removed between 90 % and 100 %. Coexisting ions had little effect on mordenite, but K(I), Ca(II), and Mg(II) could significantly increase the adsorption efficiency by up to 5.7 % for the composite. Furthermore, tannic acid and fulvic acid showed a promoting effect. Adsorption mechanisms were proposed based on the characterization results of the materials before and after adsorption, batch experiments, and density functional theory calculations. Specifically, mordenite adsorption was found to be based primarily on electrostatic attraction, surface complexation and ion exchange. Adsorption by the composite also involved π-electronic interaction and coprecipitation. In general, the composite exhibited better adsorption performance than mordenite alone.
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Journal of Central South University
·
2024
·Vol. 31
·期 4
·1292-1305
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IF 3.7
Hou Jin-feng,Sun Qian,Hao Xiu-zhen
Heavy metal composite pollution is becoming increasingly serious. In this study, CaAl-layered double hydroxide (CaAl-LDH) was prepared using the facile co-precipitating method, and was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Lead(II), Cd(II), and As(V) were selected as the representative heavy metals to evaluate the adsorption capability of the synthesized CaAl-LDH by the batch experiments. The maximal adsorption capability of CaAl-LDH for Pb(II), Cd(II), and As(V) was 786.6, 437.2 and 72.9 mg/g, respectively. The adsorption mechanism of Pb, Cd and As may be surface precipitation, isomorphic substitution and ion exchange within the interlayer spaces of LDH, respectively. In conclusion, this experiment provides a LDH material with fast and efficient adsorption performance for both anionic and cationic metals, indicating its potential for practical application in the remediation of heavy metal composite pollution.
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ANALYST
·
2024
·Vol. 149
·期 15
·4060-4071
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IF 3.6
Jie Zhou,Huiting Wang,Yaxian Chen,Dongxue Lin,Ling Zhang,Zhiqiang Xing,Qian Zhang,Jiarui Xia
The precise quantitative analysis using surface-enhanced Raman spectroscopy (SERS) in an uncontrollable environment still faces a significant obstacle due to the poor reproducibility of Raman signals. Herein, we propose a facile method to fabricate a self-calibrating substrate based on a flexible polyvinyl alcohol (PVA) film comprising assemblies of Prussian blue (PB) and Au NPs (PB@Au) for reliable detection. PB cores were coated with an Au shell through simple electrostatic interaction, forming core–shell nanostructure PB@Au assemblies within the PVA film. The outer Au layer provided identical trends in enhancement for both the PB core and neighboring targets while PB cores served as an internal standard (IS) to correct signal fluctuations. The prevention of competitive adsorption on the metal surface between targets and ISs was achieved. The proposed PVA/PB@Au film exhibited enhanced stability of Raman signals after IS correction, resulting in improved spot-to-spot and batch-to-batch reproducibility with significantly reduced standard deviation (RSD) values from 11.42% and 25.02% to 4.43% and 9.39%, respectively. Simultaneously, a higher accuracy in the quantitative analysis of 4-mercaptobenzoic acid (4-MBA) and malachite green (MG) was achieved with fitting coefficient (R2) values improving from 0.9675 and 0.9418 to 0.9974 and 0.9832, respectively. Moreover, the PVA/PB@Au film was successfully applied to detect residual MG in real fish samples. This work opens up an avenue to improve the reproducibility of Raman signals for flexible SERS substrates in the detection of residues under various complex conditions.
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Environmental Technology & Innovation
·
2024
·
IF 6.7
Yanhao Zhang,Wenlu Zhou,Chengying Liu,Guanghui Liu,Yi Li,Botao Ding,Peng Zhang,Xu Zhang,Zhibin Zhang
Wheat straw biochar (BC) or modified wheat straw biochar (MBC) could affect the aggregate structure of soil, effectively adsorb heavy metal and reduce the bioavailability of heavy metals in soil. TGA, BET, FTIR and SEM were used to characterize the surface morphology and structure of BC and MBC. The adsorption properties of BC and MBC on Pb(II) and Cd(II) in solution systems were investigated by batch experiments, and the remediation performance of Pb and Cd contaminated sediment by BC or MBC were studied by pot experiments. The results showed that MBC had a larger specific surface area of 46.04 m 2 /g and total pore volume 0.0555 cm 3 /g; the adsorption isotherms of Pb(II) and Cd(II) for BC and MBC were more suitable for Langmuir model ( R 2 over 0.91), and the maximum adsorption capacities of Pb(II) and Cd(II) by MBC could reach 71.14 and 115.64 mg/g, respectively. BC or MBC promoted the transformation of Pb and Cd from the extractable acid fraction to the oxidizable and residual fraction, reduced the migration of heavy metals and enhanced the stability of aggregates. Therefore, the results provided a perspective for the dredged contaminated sediments used as planting soil. In addition, BC or MBC, as soil amendments, could improve the abundance of microbial community. At the phylum level, the main dominant bacteria were Proteobacteria and Bacteroidetes .
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Changbin Tang,Yanrong Li,Yongqi Yu,Yuzhu Shi,Hongjiao Xu,Yujie Zhang,Juanqin Xue,Nan Zheng
To achieve targeted removal of Pb 2+ from industrial wastewater, a NF/Mn 2 CoO 4 @MoO 2 composite electrode, synthesised using the hydrothermal method combined with electrodeposition technology, was employed to construct an asymmetric capacitive deionization (CDI) system to selectively electro-adsorb and desorb Pb 2+ ions. The electrode exhibited pseudocapacitive characteristics in solutions containing Pb 2+ , facilitating rapid and reversible redox reactions. The asymmetric CDI system, utilising graphite paper as the positive electrode and NF/Mn 2 CoO 4 @MoO 2 as the negative electrode, displayed exceptional adsorption performance at 1.4 V for 1 h, decreasing the Pb 2+ concentration from 50 ppm to 4 ppb, achieving an adsorption capacity of 156.24 mg g −1 , and displaying outstanding cyclic stability. Moreover, the electrode demonstrated preferential adsorption of Pb 2+ in mixed solutions containing multiple heavy metal ions, with relative removal coefficients of 4.48 − 19.86 compared with other ions. Analysis of the adsorption mechanism indicated that during the adsorption process, Pb 2+ was embedded between MoO 2 layers, disrupting the electron cloud symmetry and triggering an oxidation reaction. Octahedral MoO 2 then lost electrons and transformed into tetrahedral [MoO 4 ] 2- , forming PbMoO 4 with embedded Pb 2+ between the layers, and achieving effective removal of Pb 2+ with high selectivity. Molecular dynamics simulations and density functional theory (DFT) calculations confirmed the high selectivity of the prepared electrode for Pb 2+ ions based on stronger binding of Pb 2+ to MoO 2 than other ions. The electrode has application potential for the capacitive removal of Pb 2+ from industrial effluent through CDI technology.
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Nano-Micro Letters
·
2025
·Vol. 18
·期 1
·14
·
IF 36.3
Huang Yu-Hua,Zou Su-Yan,Sheng Cong-Yi,Fang Yu-Chuang,Wang Xu-Dong,Wei Wei,Li Wen-Guang,Kuang Dai-Bin
A lattice-anchoring strategy using low-dimensional perovskite addresses structural instability in α-formamidinium lead iodide (FAPbI 3 ) by matching crystal lattice, mitigating residual stress and tensile strain.
Enhanced Pb-I bonding strength and reduced lattice strain improve structural stability and carrier mobility-lifetime product, enabling efficient charge transport.
Optimized X-ray detectors achieve high sensitivity (1.83 × 10 5 μC Gy air –1 cm –2 ), low detection limit (27.6 nGy air s –1 ), and stable performance under prolonged irradiation.
研究领域:
材料科学
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凝聚态物理
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半导体器件
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辐射探测
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纳米科技
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Materials Today Communications
·
2025
·
IF 4.5
Junyan Lin,Lele Chen,Chubin Li,Zuyun Chen,Jiapei Yang,Yuqi Zeng,Yuanxin Jiang,Yu Zhang,Weiwei Xing,Jiye Zhang,Jian-Guo Chen,Kai Guo
Grain boundaries or phase boundaries, which play a pivotal role in decoupling electrical and thermal transport, are frequently engineered to regulate thermoelectric performance. Although extensive research has been conducted on their composition, density, coherency, and width, relatively limited attention has been paid to the strategic utilization of local electric fields at these interfaces for manipulating charge carrier and phonon transport. By incorporating piezoelectric material Pb(Zr 0.50 Ti 0.44 Fe 0.06 )O 3 into thermoelectric material Ge 0.94 Sb 0.06 Te, a local electric field is generated that effectively impedes the transport of low-energy holes. This innovative approach results in a noteworthy enhancement of the Seebeck coefficients in the composites without compromising electrical conductivity. Consequently, an improvement in zT values can be achieved for the sample Ge 0.94 Sb 0.06 Te+ 0.3 wt% Pb(Zr 0.50 Ti 0.44 Fe 0.06 )O 3 , showing a 15 % increase compared to the sample without Pb(Zr 0.50 Ti 0.44 Fe 0.06 )O 3 . Simulation results further corroborate the practical significance of this approach, predicting an impressive conversion efficiency of 10.7 % for a single-leg thermoelectric device, thereby underscoring its considerable potential for power generation applications.
研究领域:
材料科学
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热电材料
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固体物理
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纳米技术
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能量转换
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MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Han Zhang,Xuefeng Bai,Hua Ji,Xiaochuan Yu,Rui Li,Sijia Sun,Guocheng Lv,Hao Ding
Lead ions (Pb(Ⅱ)) cause serious environmental pollution and endanger human health and it is urgent to carry out efficient treatment. Herein, a strategy was proposed to enhance the immobilization and removal of Pb(Ⅱ) (including trace Pb(Ⅱ)) from water by coating SiO 2 on the surface of CaCO 3 to prepare CaCO 3 @SiO 2 composites using the carbonation method. The findings revealed that SiO 2 coating exhibits strong activation effects on CaCO 3 . The SiO 2 coating (loaded at 8.62 wt%) increased CaCO 3 specific surface area by over 20-fold, confirming its activating effect. The maximum immobilization amount of Pb(Ⅱ) by CaCO 3 @SiO 2 reached 3354 mg/g (over twice that of CaCO 3 ), and the removal rate of trace Pb(Ⅱ) (100 μg/L) was 99.5 %. The residual Pb(Ⅱ) concentration (5.5 μg/L) complies with WHO drinking water standard. Furthermore, CaCO 3 @SiO 2 showed selective removal of Pb(II), maintaining an 87 % percentage removal after 5 cycles of recycling. This study quantified dual mechanisms: surface adsorption-complexation dominated at low concentrations (100 % at 10 mg/L), while dissolution-precipitation plays the primary role at high concentrations (99.39 % at 500 mg/L), the removal mechanism of CaCO 3 @SiO 2 was greatly affected by the initial concentration of Pb(Ⅱ), therefore, the accurate contribution rate of each mechanism at different concentrations was calculated. The synergistic effect of CaCO 3 , its surface coated SiO 2, and the rate of increase in the system pH value was found to be the fundamental reason for the significant increase in the immobilization of Pb(Ⅱ) by CaCO 3 @SiO 2 .
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Pubao Peng,Song Li,Yaru Gong,Jiajun Nan,Congmin Liang,Yang Geng,Di Li,Dewei Zhang,Shihua Zhang,Guodong Tang
Here, Pb/Y codoped SnSe nanorods were fabricated via a bottom-up, cost-effective hydrothermal method. The formation of nanorod structures generating high-density grain boundaries significantly enhances phonon scattering, serving as the primary mechanism for lattice thermal conductivity reduction. Furthermore, Y-element enrichment regions, nanoprecipitates, and dense dislocation networks provide additional phonon scattering that further suppresses phonon transport. These multiscale structural features synergistically impede phonon propagation across all frequency ranges, ultimately yielding an ultralow κL of 0.157 W m–1 K–1 at 873 K in the Pb and Y codoped SnSe nanorods. Meanwhile, Pb/Y codoping enhances carrier concentration, leading to a sharp increase in electrical conductivity in Sn0.99–xPb0.01YxSe nanorods. Concurrently, the electrical transport properties are significantly improved, resulting in enhanced power factor. As a result, this carrier and phonon synergistic optimization contributes to a peak ZT of 1.74 at 873 K in Sn0.985Pb0.01Y0.005Se nanorods. This work provides insights for developing high-performance polycrystalline SnSe through advanced doping strategies and structural design.
研究领域:
材料科学
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热电学
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纳米材料
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固体物理
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Nature Communications
·
2025
·Vol. 16
·期 1
·10078
·
IF 15.7
Zheng Weilin,Chen Jiangkun,Guo Yang,Zhang Xin,Chun Fengjun,Cao Yaxin,Gao Xiaoping,Suo Hao,Wei Xiaohe,Xing Zhifeng,Wang Yanze,Wang Feng
CsPbX 3 (X = Cl, Br, I) nanosheets have emerged as a promising platform for tuning quantum confinement effects and achieving efficient optoelectronic devices. However, synthesizing uniform CsPbX 3 nanosheets with monolayer-level thicknesses remains a challenge due to the fast reaction kinetics. Herein, we develop a synthetic strategy that leverages Pb-deficient precursors to control reaction kinetics. Our experimental investigations indicate that Pb deficiency in the precursors decelerates the crystal growth, offering enhanced dimensional control in CsPbX 3 systems. This approach enables the synthesis of uniform CsPbI 3 nanosheets with tunable thickness down to two octahedral layers, which exhibit a narrowband emission at 563 nm and high stability against spectral drift. This method is readily extended to CsPbBr 3 and CsPbCl 3 systems for precise size and shape modulation, thus affording full-color emission tuning within mono-halide perovskites. These findings establish a versatile synthetic strategy poised to advance the design and application of CsPbX 3 nanomaterials and other colloidal nanocrystals.
研究领域:
材料科学
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纳米技术
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光电子学
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钙钛矿材料
·
胶体纳米晶体
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