SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Xi Zhang,Mingzhu Huangfu,Jiushuai Deng,Yu Wang,Bozeng Wu,Mingzhen Hu,Honghui Zhao,Suozhi Wu
Specularite is generally recovered by flotation, but its floatability is relatively weak. Activation is an effective method to improve the floatability of minerals. Therefore, finding an economic and effective activator to improve the recovery of specularite is an important research direction. In this study, lead nitrate as an activator was found and confirmed to improve the floatability of specularite. Its activation mechanism was further investigated by various analytical methods. The micro-flotation tests results showed that the recovery of specularite increased from 69.57% to 92.47% at a Pb 2+ concentration of 3 × 10 -5 mol/L, an approximately 23% increase, indicating that Pb 2+ could obviously activate specularite. The SEM-EDS results illustrated that the content of Pb on the specularite surface apparently increased after specularite treatment with lead nitrate, which confirmed the adsorption of Pb species on the surface of specularite. Zeta potential results showed that the zeta potential positively shifted within the pH range from 3 to 11, which was beneficial to the occurrence of electrostatic adsorption and chemisorption between negatively charged oleate species and specularite. XPS results revealed that lead species mainly adsorbed on the O atoms of Fe-O and Fe-OH at the specularite surface, and Pb atoms became new sites to interact with sodium oleate. In addition, Pb 2+ and Pb(OH) + were the predominant components that interacted with the specularite surface and formed -O-Pb and Fe-O-Pb complexes, which considerably increased the number of reactive sites on the specularite surface. After oleate components interacted with Pb-modified specularite, a denser hydrophobic layer was generated on the surface of specularite, which intensified the floatability of specularite.
研究领域:
矿物加工
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材料科学
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化学工程
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DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 5
·1397-1403
·
IF 4.58
Yuan Min,Song Zhihong,Fei Jiayu,Wang Xinglong,Xu Fei,Cao Hui,Yu Jinsong
The authors describe a quartz crystal microbalance based aptasensor for the determination of Pb 2+ . In order to enhance its response, oligonucleotide-embellished gold nanoparticles (AuNPs) were used to amplify the frequency changes. The method is based on the use of specific aptamers immobilized on the surface of the quartz crystal microbalance (QCM) and the binding of Pb 2+ , which prevents the self-assembly of the AuNPs on the QCM. Trace concentrations of Pb 2+ can be determined by monitoring the change in the response frequency of the QCM. The method has a 4 nmol∙L −1 detection limit and works in the 5 to 200 nmol∙L −1 Pb 2+ concentration range. This aptasensor also shows adequate selectivity for Pb 2+ over potentially interfering metal ions.
Schematic of the assay. The specific aptamer SAP does not readily combine with its partial complementary strand CSAP in the presence of Pb(II) ion. Thus, the mass change on the crystal is inversely proportional to the concentration of Pb(II).
研究领域:
分析化学
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环境科学
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纳米技术
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产品关联
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2020
·
IF 4.872
Shuang Guan,SiYu Tao,YiXuan Huang,YingLi Jin,YuTing Hu,Jing Lu
Carbon black (CB) and heavy metals are the main components of Particulate Matter (PM). Although the individual toxicities of CB and heavy metals have been extensively studied, the combined toxicity is much less understood. In this study, we choose the nano carbon black (CBNPs) and Pb 2+ to simulate fine particles in the atmosphere and study the combined toxic effect on rat alveolar macrophages. The data showed that CBNPs could adsorb Pb 2+ to form CBNPs-Pb 2+ complex and displayed an altered physical properties by particle characterization. CBNPs-Pb 2+ synergistically induced rat alveolar macrophages apoptosis and blocked autophagy flux compared with CBNPs and Pb 2+ individually. Consistent with this, CBNPs-Pb 2+ could impair the mitochondrial membrane potential (MMP), activate apoptotic signaling pathways, inhibit lysosomal function.
研究领域:
毒理学
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环境科学
·
细胞生物学
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产品关联
DOI
PubMed
高影响因子
Nanophotonics
·
2019
·Vol. 9
·期 2
·327-336
·
IF 6.908
Yuting Zhao,Shuaiwen Gan,Leiming Wu,Jiaqi Zhu,Yuanjiang Xiang,Xiaoyu Dai
Germanium selenide (GeSe) nanosheets are stable and inexpensive and considered to have a great potential for photovoltaic applications, however we have demonstrated that GeSe nanosheets are also promising for sensing technology, in this paper. By spin-coating the GeSe nanosheets on the surface of noble metal (Au), we have obtained a surface plasmon resonance (SPR) sensor with significantly enhanced sensitivity, and the performance of the sensor is closely related to the thickness of the GeSe film. By detecting different refractive index solutions, we have obtained the optimized sensitivity with 3581.2 nm/RIU (which is nearly 80% improvement compared to traditional SPR sensors) and figure of merit with 14.37 RIU −1 . Moreover, the proposed SPR sensor was vastly superior in sensing Pb 2+ heavy metal ions after coating it with chitosan and GeSe composite. A maximum sensitivity of 30.38 nm/μg/l has been verified, which is nearly six times better than that of conventional SPR sensor. Our results demonstrated that GeSe nanosheets overlayer with modified SPR sensor has its great potential in heavy metal detection and chemical-specific molecular identification.
研究领域:
纳米技术
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光学
·
传感器
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环境科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Ning Li,Tiantian Wu,Yuzheng Cai,Tiange Li,Lianjun Song,Xianqing Huang,Jiansheng Zhao,Erkigul Bukyei,Tianlin Wang
Lead ion (Pb 2+ ) pollution seriously threatens the quality of aquatic products. In this study, a ratiometric fluorescence sensor consisting of tangerine fluorescent Mn:ZnS QDs (T-QDs) and blue fluorescent Fe-MOF (B-MOF) was developed for selective recognition of Pb 2+ . Upon exposure to Pb 2+ , the fluorescence of T-QDs was quenched while the fluorescence of B-QDs was slightly changed, causing the changes of fluorescence colors from tangerine to blue with a detection limit (LOD) of 3.79 nmol/L. The sensor also had the strengths of low cost, easy to operate, excellent sensitivity and selectivity. Significantly, a portable detection platform integrated with the sensor was constructed to achieve on-site visual detection. As expected, the detection platform was successfully applied for testing Pb 2+ with the LOD of 7.78 nmol/L. The strategy may not only provide a great capacity for on-site monitoring of Pb 2+ in aquatic products but also expand application in environmental pollution detection.
研究领域:
环境科学
·
分析化学
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材料科学
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食品安全
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Yage Li,Sabry M. Shaheen,Muhammad Azeem,Lan Zhang,Chuchu Feng,Jin Peng,Weidong Qi,Junxi Liu,Yuan Luo,Yaru Peng,Esmat F. Ali,Ken Smith,Jörg Rinklebe,Zengqiang Zhang,Ronghua Li
Removal of toxic chemicals from the environment using novel adsorbents is of great concern. In this study, a novel composite of molybdenum trioxide (MoO 3 )-engineered biochar (MoO 3 -BC) was derived from corn straw and synthesized for the removal of Pb(II) from water. The pyrolysis temperature of 600 °C was suitable for the thermal self-assembly of MoO 3 -BC. Although MoO 3 -BC had lower S BET (59.3 m 2 /g) than the pristine BC (157.8 m 2 /g), it had a stronger adsorption affinity to Pb(II). The Pb(II) removal capacity of MoO 3 -BC was 229.87 mg/g at pH 4.0, and the adsorptive removal of Pb(II) was fit using a pseudo-second-order model and the Langmuir model. High temperature favored the removal of Pb(II) by MoO 3 -BC; However, the removal of Pb(II) was inhibited with increasing the ion strength. The MoO 3 -BC revealed an acceptable stability and reusability, since the removal efficiency of Pb(II) remained above 80.7%, even after 8 cycles. The MoO 3 -BC effectively reduced ≥99.9% of Pb(II) in the polluted irrigation water. The Pb(II) removal mechanisms involved surface electrostatic attraction, ion exchange and surface complexation. These findings conclude that the MoO 3 -BC is a novel composite that can be used for the removal of Pb from contaminated water . More studies are needed to investigate the potentiality of MoO 3 -biochar composite for the removal of other metals from water in a mono and competitive sorption system.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Wenchao Niu,Xiaoshan Qiu,Pingxiao Wu,Wenqi Guan,Yihao Zhan,Luwei Jin,Nengwu Zhu
Aluminol groups are effective for removing toxic metal ions . However, their use is significantly limited because they are usually on the inner surface of halloysite tubes. Herein, we realign and expose the abundant aluminol groups using a hydrothermal process. We found that dickite was gradually formed with increased sodium metasilicate proportion. Also, a uniform mushroom-like structure was formed, extending from the orifice to the middle of the hollow tubes and eventually forming a sphere. Further, part of the halloysite tube gradually broke, expanding into lamellar, eventually forming a small spheroid. The Al-O-Si groups were fractured by sodium metasilicate and aluminol groups on the inner surface of halloysite tubes, forming many aluminol groups. Moreover, the average pore size of the halloysite increased, indicating that numerous halloysite mesopores converted to dickite macropores . Thus, we inferred that the tubes gradually unfolded when the metasilicate first binds with the aluminol groups on the inner of the halloysite tubes. The modification enhanced the material's adsorption capacity for Pb 2+ , Cd 2+ , and Cr 3+ nearly 20, 12, and 10 times, respectively, stronger than the original halloysite mineral. Consequently, exposing and realigning aluminol groups of halloysite significantly improved toxic metal ions' removal.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-10
·
IF 14.919
Ma Lin,Yan Zhengguang,Zhou Xiaoyuan,Pi Yiqun,Du Yiping,Huang Jie,Wang Kaiwen,Wu Ke,Zhuang Chunqiang,Han Xiaodong
Recently, there are significant progresses in the growth of organic-inorganic lead halide perovskite single crystals, however, due to their susceptible nucleation and growth mechanisms and solvent requirements, the efficient and generalized growth for these single crystals is still challenging. Here we report the work towards this target with a polymer-controlled nucleation process for the highly efficient growth of large-size high-quality simple ternary, mixed-cations and mixed-halide perovskite single crystals. Among them, the carrier lifetime of FAPbBr 3 single crystals is largely improved to 10199 ns. Mixed MA/FAPbBr 3 single crystals are synthesized. The crucial point in this process is suggested to be an appropriate coordinative interaction between polymer oxygen groups and Pb 2+ , greatly decreasing the nuclei concentrations by as much as 4 orders of magnitudes. This polymer-controlled route would help optimizing the solution-based OIHPs crystal growth and promoting applications of perovskite single crystals.
研究领域:
材料科学
·
化学
·
物理学
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Jun-Tao Cao,Xiao-Jing Liao,Yu-Ling Wang,Yan-Ming Liu
A novel photoelectrochemical (PEC) aptasensor for lead ion (Pb 2+ ) detection was proposed on the basis of the CdSe quantum dots (QDs) co-sensitized ZnO-CdS nanostructure and the specificity of aptamer. The CdSe QDs-capped cDNA, as a signal enhancement element, could hybridize with the aptamer on the sensing platform to generate a CdSe/CdS/ZnO dual co-sensitized structure, realizing a great enhancement in photocurrent response. In the presence of Pb 2+ , the aptamer on the sensing interface specifically bound with the Pb 2+ to form G-quadruplex structures, which greatly inhibit the hybridization between aptamer and CdSe QDs-cDNA, leading to a decrement of the photocurrent signal. As the concentration of Pb 2+ increased, the photocurrent response showed a diminishing tendency. Under the optimized conditions, the fabricated PEC aptasensor exhibited a linear response between photocurrent variation and the logarithm of Pb 2+ concentration in the scope of 1.0 × 10 −9 M to 1.0 × 10 −5 M with a detection limit of 3.4 × 10 −10 M. Moreover, the aptasensor has been applied in the determination of Pb 2+ in environmental water samples with the good selectivity .
研究领域:
分析化学
·
环境科学
·
纳米技术
·
生物传感器
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 20
·9472-9483
·
IF 2.302
Wang Qiang,Feng Jin,Ma Lirong,Wei Wei,Xie Jimin,Xia Changkun,Zhu Jianjun,Jiang Deli
Monolithic silica aerogels were prepared by sol–gel process via ambient drying process. TEOS and APTES were used as coprecursors and wet gels were crosslinked by three kinds of diisocyanate. The strengthened silica aerogels possess densities which range from 0.298 to 0.463 g/cm 3 , and the specific surface areas range from 81.17 to 135.48 m 2 /g. In this paper, silica aerogels crosslinked with different diisocyanate were used as adsorbents for the removal of heavy metals. At the same time, some factors such as the initial pH and concentration of heavy metals were investigated by a batch of experiments. The equilibrium sorption data have been fitted by different isotherm model, and the data fitting by Freundlich isotherm model indicates that the process of adsorption is favorable. Under the condition of the optimum adsorption pH, the maximum theoretical adsorption capacity computed from Langmuir model is 118.73 mg/g for Pb 2+ , 57.03 mg/g for Cr 3+ , and 60.86 mg/g for Cd 2+ , respectively with the silica aerogels crosslinked with 1,6-hexamethylene diisocyanate (HDI).
研究领域:
材料科学
·
环境科学
·
化学工程
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产品关联
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Qiang Zou,Xin Li,Tao Xue,Jia Zheng,Qi Su
A conceptually new class of DNA logic gates for Hg 2+ and Pb 2+ ion simultaneous detection has been constructed based on the activity of DNAzyme dependent on metal ions . For sensitive and specific detection of Hg 2+ and Pb 2+ ions, we demonstrate a surface-enhanced Raman scattering (SERS)-active platform by employing the oligonucleotide-functionalized and gold coated polystyrene microspheres (PSMPs). In this work, Hg 2+ and Pb 2+ were used as the input, and the SERS signals were the output. Hg 2+ ions were captured by a mismatched T-Hg-T bridge. Pb 2+ ions were bound to 8–17DNAzyme to break the cleavage substrate. The limit of detection (LOD) of Hg 2+ is 0.1 nmol L −1 and Pb 2+ is 1.0 nmol L −1 , which is far below the limit of 10.0 ppb (31 nmol L −1 ) and 10.0 ppm (3.02 × 10 4 nmol L −1 ) for drinking water stipulated by the World Health Organization. Additionally, this system has the potential to be ideal candidates for intelligent DNA calculator design applications. Furthermore, the designed strategy could be extended to other multiplex metal ions that can be combined with DNA molecules, and can be applied to many other fields such as environmental detection, toxin detection and liquid analysis.
研究领域:
分析化学
·
环境科学
·
生物化学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Xinxing Wang,Youxiao Qi,You Shen,Yue Yuan,Lindi Zhang,Chongyu Zhang,Yanhui Sun
It is a significant and challenging task to simultaneously detection of multiple heavy metal ions with convenience, sensitivity and reliability. Herein, a novel ratiometric electrochemical sensing method was established for the simultaneously detection of three main heavy metal ion pollutants (Cd 2+ , Pb 2+ and Cu 2+ ). The sensing platform was constructed by a composite of ferrocenecarboxylic acid functionalized metal-organic framework (MOF), Fc-NH 2 -UiO-66, and thermally reduced graphene oxide (trGNO), which was designated as trGNO/Fc-NH 2 -UiO-66. NH 2 -UiO-66 has porous structure and large specific surface area, which is beneficial to the adsorption and preconcentration of heavy metal ions. The introduction of trGNO and Fc improves the conductivity and electrochemical activity of the MOF material. Moreover, the signal of Fc can be used as internal reference to develop ratiometric detection, which greatly improves the reproducibility and reliability of electrochemical detection. Based on this ratiometric electrochemical sensing platform, the simultaneous, sensitive and reliable detection of Cd 2+ , Pb 2+ and Cu 2+ was realized. This work provides a new sensing platform for simultaneous detection of multiple heavy metal ions and greatly expands the application of UiO-66-type MOFs in electrochemical field.
研究领域:
分析化学
·
环境科学
·
材料科学
·
电化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）