SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Hao Zhang,Xiaodie Li,Chengming Xiao,Jia Xie,Xin Yan,Chaohai Wang,Yujun Zhou,Junwen Qi,Zhigao Zhu,Xiuyun Sun,Jiansheng Li
Selective capture of the toxic and ubiquitous heavy metal ions is crucially desired yet still significant challenge for water purification. Herein, a covalent organic framework-reduced graphene oxide nanocomposite (TpPa@rGO) was developed and employed as cathode for the first time to selectively remove Pb 2+ from complex water via an electrosorption process. Specifically, the rGO provides the electrical conductivity and induces the electric double layer capacitance to attract cations approaching to the electrode surface, while the TpPa endows abundant highly selective redox-active sites to capture Pb 2+ . Thanks to the ingenious synergy of capacitive rGO and redox-active TpPa, more than 99.6% of Pb 2+ can be effectively removed by the TpPa@rGO electrode in a mixed solution containing Pb(NO 3 ) 2 (50 mg L −1 ) and multicomponent nitrates (100 mg L −1 for each), as well as good cycling stability. Interestingly, the interfering ions can serve as additional electrolytes to accelerate the accumulation of Pb 2+ around the TpPa@rGO electrode instead of competing for active sites, thereby increasing the absolute adsorption capacity of Pb 2+ from 94.6 mg g −1 in single Pb(NO 3 ) 2 solution to 129.8 mg g −1 in the multicomponent solution. The enhanced selective electrosorption mechanism on Pb 2+ removal by TpPa@rGO and their recyclability were also investigated. The capacitive matrix and additional electrolytes accelerate the ion transfer and enhance ion accessibility to the electrode, thereby anchoring the Pb 2+ on the N/O groups of TpPa. This study may put forward a promising method for the selective capture of heavy metal ions in complex water.
研究领域:
环境科学
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材料科学
·
化学工程
·
水处理
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Xiao Jiang,Qing-Da An,Zuo-Yi Xiao,Shang-Ru Zhai,Zhan Shi
Versatile adsorptive materials that can efficiently capture anionic and cationic heavy metals are extremely significant in purification of complex wastewater systems. Herein, a new type of amine modified, biopolymer-derived core/shell-like adsorbents were employed in heavy metal anion and cation adsorption. The maximum adsorption capacities for Cr(VI), Pb(II), and Cu(II) were measured to be 497.1, 535.6, and 163.7 mg/g, respectively. The adsorbent also showed great performance in heavy metal cation adsorption in fixed bed column experiments. Additionally, removal efficiency and rapid adsorption kinetics on low concentration heavy metal pollutions for both anion and cations were well discussed to demonstrate the potential in real accidental heavy metal pollution. The prepared core/shell-like biopolymer adsorbents were demonstrated to be a kind of versatile adsorbent for both anionic and cationic heavy metal ions in aqueous solutions.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Mao-Rong Xie,Yu Cai,Yu-Qi Liu,Zhi-Yong Wu
Pb 2+ is one of the major environmental pollutants , which can be visually detected by surface plasmon resonance of nanoparticles . Paper based analytical device, as a newly developed microfluidic detection platform, is featured in cost-effective and suitable for on-site analysis. In this paper, a sensitive and portable detection method for Pb 2+ was proposed, in which Pb 2+ was electrokinetically stacked on the paper fluidic channel by geometric field amplification effect and visualized online by glutathione-modified silver nanoparticles . Colorimetric quantification of the visualized stacking band was conducted by smart phone camera. To avoid unfavorable influence from pH change on the surface plasmon resonance visualization, field amplification effect was introduced by geometric design of the paper fluidic channel. The enriched Pb 2+ was clearly visible on the paper substrate, and the stacking band intensity was about four orders of magnitude enhanced, comparing to the intensity without stacking. A linear response to Pb 2+ was observed in the range of 0.3–7.0 μM (R 2 = 0.997) with a limit of detection of 86 nM and a limit of quantity of 0.28 μM. The established method was used in the detection of Pb 2+ from river and lake water samples, and the results were confirmed by atomic absorption spectroscopy method.
研究领域:
环境科学
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分析化学
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微流控技术
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纳米技术
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传感器与执行器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Xing Cao,Weibing Wang,Rui Ma,Shichang Sun,Junhao Lin
In order to exhaustively investigate the physical and chemical mechanisms of heavy metal immobilization in sludge incineration residue (SIR)-based magnesium potassium phosphate cement (MKPC), this work investigated the influence of Pb 2+ and Zn 2+ on the compressive strength and microstructure of SIR-based MKPC, and the efficiency of Pb and Zn immobilization. Taking the difference of Ksp (solubility product) of different heavy metal compounds as the entry point, the physical and chemical mechanisms of Pb and Zn immobilization, and the competitive mechanism between coexisting ions, were comprehensively analyzed. It was discovered that Pb 2+ is in the form Pb 3 (PO 4 ) 2 , and Zn 2+ is immobilized in the form Zn 2 (OH)PO 4 [Zn 3 (PO 4 ) 2 is preferentially formed, when the pH > 7, Zn 3 (PO 4 ) 2 is converted to Zn 2 (OH)PO 4 ]. The low solubility of heavy metal phosphates is the main reason that Pb 2+ and Zn 2+ are well immobilized. The preferential formation of Pb 3 (PO 4 ) 2 (K sp = 8 × 10 −43 ) and Zn 3 (PO 4 ) 2 (K sp = 9.0 × 10 −33 ) reduced the amount of MgKPO 4 ·6H 2 O (K sp = 2.4 × 10 −11 ), resulting in a decrease in compressive strength. Besides, coexisting Pb 2+ and Zn 2+ has a competitive effect: Pb 2+ will weaken the immobilization efficiency of Zn 2+ . The new exploration of these mechanisms provide a theoretical basis for rationally adjusting the Magnesia/Phosphate ratio to enhance the compressive strength and improve the efficiency of heavy metals immobilization.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Junshuai Zhang,Jialong Duan,Qiaoyu Zhang,Qiyao Guo,Furi Yan,Xiya Yang,Yanyan Duan,Qunwei Tang
Intramolecular structure of interfacial passivator highly determines the bond strength with detrimental defects located at perovskite surfaces and grain boundaries. Herein, we investigate the steric-charge-dependence of various π-conjugated pyridine derivatives on electron-donating ability to passivate inorganic CsPbIBr 2 perovskite film. The primary results demonstrate that the photovoltaic performances tightly correlate with the multidentate coordination sites and structure-steric hindrance because of their synergistic regulation on intramolecular electron-cloudy density and charge extraction. Comparing to pyridine and terpyridine treated devices, the bipyridine passivated device delivers an increased efficiency of 11.04% with a high open-circuit voltage of 1.301 V and improved stability after persistent irradiation over 20 h and storage for 60 days, which is one of the highest efficiencies for carbon-based all-inorganic CsPbIBr 2 solar cells. This work provides a direction to choose ideal passivator for high-efficiency perovskite optoelectronics.
研究领域:
材料科学
·
光伏技术
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有机-无机杂化材料
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能源材料
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2022
·Vol. 14
·期 10
·1589-1598
·
IF 1.067
Jin Hong,Wu Yali,Li Yanzhong
Adsorption method has attracted extensive attention in heavy metal wastewater treatment due to its low cost, abundant sources, and simple operation. Kaolin is utilized as raw material, waterborne polyurethane is utilized as dispersion medium, and dimethyl sulfoxide (DMSO) is utilized
as intercalation agent, to prepare intercalation polymerization modified kaolin material (KBEP). It is then characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermogravimetry (TG), and other methods. The polymer is utilized
for static adsorption of Cu2+ and Pb2+, and the kinetic analysis of the adsorption process is carried out. The results show that the layer spacing of kaolin increases substantially (from 0.69 nm to 0.81 nm) after modification. When the content of kaolin is less than 1.7%,
kaolin exists in intercalation or stripping state in waterborne polyurethane matrix. When the content of kaolin is higher than 1.7%, kaolin can exist in the form of agglomeration with waterborne polyurethane matrix. Compared with pure polyurethane, the composite’s thermal stability is
improved, and the maximum thermal weight loss of the hard section is increased by 50 °C. When kaolin content is 2.5%, the temperature of the hardness and the fastest thermal decomposition rate of the soft section increases by 30 °C and 26 °C, respectively. The adsorption test reveals
that the Cu2+ elimination rate reaches 93.7% when the addition amount of the prepared material reaches 1.5 g/L. When the addition amount of the prepared material reaches 0.6 g/L, the Pb2+ elimination rate reaches 95.8%. With the increase of the dosage of kaolin composite,
the adsorbability of the polymer to the two metal ions decreases gradually. Kinetic experiments show that the adsorption of Cu2+ and Pb2+ is in line with the pseudo-second-order kinetic (PSOK) equation. The adsorbability of Cu2+ and Pb2+ is 75.3
mg/g and 268.6 mg/g, respectively. The adsorption way is mainly chemical adsorption.
研究领域:
环境科学
·
材料科学
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化学工程
·
废水处理
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
R.R. Yang,M. Li,Y.F. Zhao,P. Wang,S. Ye
Halogen vacancies are regarded to play a vital role in photo-induced phase segregation and the resulting switchable emission colors in the soft mixed-halide perovskites ; however, its control strategy via the balanced Pb 0 defects remains a big challenge. The research reports the regulation of synthesis and photochromic behavior via interfacial Eu 3+ /Eu 2+ -Pb 0 /Pb 2+ redox in composites of porous Ca 0.9 Eu 0.1 MoO 4 and nominal mixed-halide perovskite CsPbCl 1.5 Br 1.5 . The composite takes full advantage of Eu 3+ ions with the concerns of its luminescence and variable valences. It provides an additional emission color besides the halide perovskite, manipulates the Pb 0 defects and the resulting Br-rich domain via interfacial redox reaction in the composites. The more contents of surfaced Eu 3+ caused by substituting the unequivalent Ca 2+ ions and the high volume-to-surface ratio of the porous Ca 0.9 Eu 0.1 MoO 4 guarantees the interfacial access for the Eu 3+ and the halides. The research provides some perspectives on the regulation of ionic valence and photoluminescence of halide perovskites with the use of lanthanide ions. The composites may find potential applications in the anti-counterfeiting field.
研究领域:
材料科学
·
光电技术
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纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zhichang Ma,Jing Sun,Hemeiling Cai,Junwei Di
A photoelectrochemical (PEC) sensor, utilizing the semiconductor BiVO 4 and gold nanoparticles (AuNPs) modified with glutathione (GSH), was successfully fabricated for the sensitive detection of Pb 2+ ions. The calcinated BiVO 4 -modified indium tin oxide (ITO) electrode (ITO/BiVO 4 ) generated a low cathodic photocurrent response under light irradiation . The photocurrent at ITO/BiVO 4 /AuNPs photoelectrode increased significantly due to the plasmon enhancement of AuNPs and the electron transfer. This enhancement photocurrent intensity was largely suppressed by introducing GSH to form ITO/BiVO 4 /AuNPs/GSH. It minimized the base photocurrent of the photoelectrode. Upon the addition of Pb 2+ ions in the cell, they were adsorbed on the electrode surface through the interaction with the two carboxyl groups in GSH. Subsequently, Pb 2+ ions, serving as electron acceptors , underwent reduction under light irradiation, leading to increase in photocurrent intensity again. Therefore, a signal "on-off-on" PEC sensor was developed for the detection of Pb 2+ ions. The concentration of Pb 2+ ions show a good linearity between 0.1 pM and 10 μM with a detection limit of 0.08 pM (S/N = 3). The prepared PEC sensor shows high sensitivity, a wide linear range, and good selectivity. This work provides a promising platform for the analytical detection of heavy metal ions .
研究领域:
分析化学
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环境科学
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材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 10
·1-10
·
IF 6.232
Weng Chenyuan,Li Xiaoyun,Lu Qiaoyun,Yang Wei,Wang Jing,Yan Xiaoqiang,Li Bingzhi,Sakran Marwan,Hong Junli,Zhu Wanying,Zhou Xuemin
A highly sensitive and selective electrochemical biosensor for Pb 2+ with a dual-amplification strategy is proposed. The first amplification step was realized by the cycle of Pb 2+ and 8–17 DNAzyme (S2), and the hybridization chain reaction (HCR) triggered by S1 further amplified the electrochemical signal. Fe 3 O 4 @Au NPs, as a multifunctional magnetic carrier, is not only manifested in the construction of a magnetically controlled electrochemical response interface, but also has significant contribution in the purifying system, reducing interference, increasing the specific surface area, and the DNA loading. The magnetic nanocomposites were characterized by TEM as spheres with particle size of around 39 nm. When there was no Pb 2+ , long double-strand DNA (dsDNA) is formed on the surface of Fe 3 O 4 @Au NPs by the S1-triggered HCR; in the presence of Pb 2+ , S2 is activated and S1 on the surface of magnetic biocomposites (Fe 3 O 4 @Au NPs-S1) is continuously cleaved with the cycle of Pb 2+ and S2, leading to a significant decrease of methylene blue (MB) absorbed on dsDNA. Such reverse dual-signal amplification strategy effectively increased the current difference and improved the sensitivity of the proposed sensor. The electrochemical signal of MB was obtained by differential pulse voltammetry (DPV) with preconcentration, showing a linear response toward Pb 2+ ranging from 50 pM to 1 μM with a detection limit of 15 pM. The proposed method has feasible applications in detecting other heavy metal ions based on other metal-dependent DNAzyme.
Graphical Abstract
研究领域:
分析化学
·
纳米技术
·
生物传感器
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Yuxuan Ji,Jiawei Xu,Shang Wang,Bin Xue,Chenyu Li,Xi Zhang,Xiaobo Yang,Zhigang Qiu,Jingfeng Wang,Xiaosheng Xiao,Chen Zhao,Zhiqiang Shen
On-site detection of antibiotics and heavy metal ions is critical due to their severe impact on the environment and human health. In this study, allosteric transcription factors (aTFs) were integrated with optical fiber sensing technology to develop a aTF-quantum dot (QD) complex fluorescent fiber biosensor. This biosensor allows for the one-step quantitative on-site detection of tetracycline and Pb 2+ . Within 5 min, the prepared biosensor enabled the quantitative detection of tetracycline and Pb 2+ with detection limits of 16 nM and 0.14 nM, respectively. The linear detection ranges were 10 nM to 1 × 10 6 nM for tetracycline and 0.1 nM to 500 nM for Pb 2+ . The biosensors demonstrated excellent selectivity and could be reused at least five times after regeneration. In actual sample analyses, the biosensors achieved recovery rates of 96.86% to 112.66% for tetracycline and 98.69% to 104.01% for Pb 2+ . These results highlight the advantages of the prepared biosensors, including rapid detection, high sensitivity, and excellent selectivity. Furthermore, a portable water contaminant analyzer platform and corresponding software were developed, significantly enhancing the on-site rapid detection capabilities of optical fiber biosensors. This study reports a novel strategy for constructing optical fiber fluorescent biosensors, making them particularly suitable for field detection applications.
研究领域:
环境科学
·
分析化学
·
生物传感器
·
光纤技术
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Ting-Ting Ruan,Wen-Wen Wang,Chun-Li Hu,Xiang Xu,Jiang-Gao Mao
Two new lead(II) borate-sulfate mixed-anion compounds, namely, Pb 4 (BO 3 ) 2 (SO 4 ) and Pb 2 [(BO 2 )(OH)](SO 4 ), have been prepared by using high-temperature melt method or hydrothermal reaction . These compounds exhibit two different types of 3D structures composed of the same anionic units of BO 3 triangles and SO 4 tetrahedra which are interconnected by lead(II) cations. In Pb 4 (BO 3 ) 2 (SO 4 ), the lead(II) ions are bridged by borate anions into 3D [Pb 4 (BO 3 ) 2 ] 2+ architectures with 1D tunnels of 8-member rings along the a -axis, which are filled by the sulfate anions. In Pb 2 [(BO 2 )(OH)](SO 4 ), the lead(II) ions are interconnected by borate and sulfate anions into 2D Pb-B-O and Pb-S-O layers parallel to the ab plane, respectively, and these layers are further condensed into the 3D lead(II) borate-sulfate framework. TGA and DSC studies indicate that Pb 4 (BO 3 ) 2 (SO 4 ) is congruently melting with a melting point of 689 °C whereas Pb 2 [(BO 2 )(OH)](SO 4 ) decomposes at approximately 335 °C. UV/Vis/NIR optical diffuse reflectance spectrum measurements reveal the optical band gaps of 4.03 and 4.08 eV for Pb 4 (BO 3 ) 2 (SO 4 ) and Pb 2 [(BO 2 )(OH)](SO 4 ), respectively. Furthermore, the electronic structures of Pb 4 (BO 3 ) 2 (SO 4 ) have also been calculated.
研究领域:
无机化学
·
材料科学
·
固体化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Heng Zhao,Junhua Sun,Yanjie Du,Miaomiao Zhang,Zhen Yang,Jianhui Su,Xiujing Peng,Xiaolei Liu,Guoxin Sun,Yu Cui
Lead is a toxic heavy metal that is highly harmful to humans. Developing fast, efficient, and separable materials to treat lead-contaminated wastewater is challenging. In this paper, Cu-based MOF composite (SCC-CuMOF) was prepared by in-situ growth method and used for the removal of Pb 2+ from aqueous solutions. The obtained materials were characterized by field emission scanning electron microscope (FESEM), energy dispersive spectroscopy (EDS) mapping, Brunauer-Emmett-Teller (BET) specific surface area, X-ray diffraction (XRD) and infrared spectroscopy (IR). The effects of pH, coexisting ions, contact time, initial ion concentration, and temperature on the removal of Pb 2+ were investigated. SCC-CuMOF exhibited excellent adsorption performance on Pb 2+ . Adsorption of Pb 2+ on SCC-CuMOF were in accordance with the pseudo-second-order model and Langmuir model. The adsorption thermodynamic study suggested that the adsorption process was spontaneous and endothermic. The results revealed that Pb 2+ might be adsorbed onto SCC-CuMOF via ion exchange and coordination interaction. In general, SCC-CuMOF has the potential to remove Pb 2+ from wastewater rapidly and efficiently.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）