Materials
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2020
·Vol. 13
·期 5
·1241
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IF 3.057
Xiang Li,Yan Xiong,Ming Duan,Haiqin Wan,Jun Li,Can Zhang,Sha Qin,Shenwen Fang,Run Zhang
For further the understanding of the adsorption mechanism of heavy metal ions on the surface of protein-inorganic hybrid nanoflowers, a novel protein-derived hybrid nanoflower was prepared to investigate the adsorption behavior and reveal the function of organic and inorganic parts on the surface of nanoflowers in the adsorption process in this study. Silk fibroin (SF)-derived and copper-based protein-inorganic hybrid nanoflowers of SF@Cu-NFs were prepared through self-assembly. The product was characterized and applied to adsorption of heavy metal ion of Pb(II). With Chinese peony flower-like morphology, the prepared SF@Cu-NFs showed ordered three-dimensional structure and exhibited excellent efficiency for Pb(II) removal. On one hand, the adsorption performance of SF@Cu-HNFs for Pb(II) removal was evaluated through systematical thermodynamic and adsorption kinetics investigation. The good fittings of Langmuir and pseudo-second-order models indicated the monolayer adsorption and high capacity of about 2000 mg g−1of Pb(II) on SF@Cu-NFs. Meanwhile, the negative values ofΔrGm(T)θandΔrHmθproved the spontaneous and exothermic process of Pb(II) adsorption. On the other hand, the adsorption mechanism of SF@Cu-HNFs for Pb(II) removal was revealed with respect to its individual organic and inorganic component. Organic SF protein was designated as responsible ‘stamen’ adsorption site for fast adsorption of Pb(II), which was originated from multiple coordinative interaction by numerous amide groups; inorganic Cu3(PO4)2crystal was designated as responsible ‘petal’ adsorption site for slow adsorption of Pb(II), which was restricted from weak coordinative interaction by strong ion bond of Cu(II). With only about 10% weight content, SF protein was proven to play a key factor for SF@Cu-HNFs formation and have a significant effect on Pb(II) treatment. By fabricating SF@Cu-HNFs hybrid nanoflowers derived from SF protein, this work not only successfully provides insights on its adsorption performance and interaction mechanism for Pb(II) removal, but also provides a new idea for the preparation of adsorption materials for heavy metal ions in environmental sewage in the future.Keywords:silk fibroin;hybrid nanoflowers surface;Pb(II) removal;interaction mechanism
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chao Xiong,Shixing Wang,Peng Hu,Liyun Huang,Can Xue,Zujin Yang,Xiantai Zhou,Yongqing Wang,Hongbing Ji
We report an efficient, reusable, and selective 6-aminothiouracil (ATA)-modified Zr(IV)-based adsorbent (defined as UiO-66-ATA(Zr)) for lead ion removal in water. The adsorption equilibrium time and the maximum sorption capacity of UiO-66-ATA(Zr) for Pb(II) are, respectively, 120 min and 386.98 mg/g at pH 4 and 298 K. The Pb(II) removal rate reaches 96% at 60 min and exceeds 99% at the equilibrium state in the pH range of 2.0–5.8. Hill and pseudo-second-order models can well describe the sorption process. Pb(II) adsorbing onto UiO-66-ATA(Zr) is an irreversible, favorable chemisorption process with multimolecule participation and film diffusion control. The calculations of density functional theory, the experimental results, and the characterization analyses suggest that the binding mechanisms are the chelation and ion-exchange/electrostatic interactions between hydroxyl/amino/sulfhydryl groups of UiO-66-ATA(Zr) and Pb(II). Besides, UiO-66-ATA(Zr) has a better affinity to Pb(II) than the coexisting ions in water and an excellent repeatability at eight cycles of adsorption. Moreover, the thermodynamic study shows that UiO-66-ATA(Zr) adsorbing Pb(II) is an endothermic reaction. Thus, UiO-66-ATA(Zr) is a prospective sorbent for Pb(II) removal under the initiative of environmental protection and water purification, and this work may also provide an idea for industrial catalysis.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2020
·
IF 4.872
Yupeng Wang,Qintie Lin,Rongbo Xiao,Shuailong Cheng,Haoyu Luo,Xiaoqing Wen,Libin Wu,Quanfa Zhong
This study investigated the application of a specific soil washing method to remove Cu and Pb from contaminated agricultural soil. To develop an efficient leaching agent of heavy metal compounds for use in farmland soil, a mixed chelator (MC) was prepared using potassium fulvic acid (PFA, 3.2%) and citric acid (CIT, 0.16 M) in a volume ratio of 4:1 (PFA:CIT = 4:1); the optimal solid-liquid ratio (S/L = 1:20), initial pH value (4.51) and contact time (360 min) were also explored. Under optimal conditions, the removal efficiencies of MC for Cu and Pb were 42.92% and 50.46%, respectively, both of which performed better than PFA (27.86% of Cu and 17.91% of Pb) and CIT (42.04% of Cu and 41.46% of Pb). The effective states, bioavailability and relative mobilities of Cu and Pb in soil were also efficiently reduced by MC, which also increased the stability of these elements, thereby lowering the risk to soil health. More importantly, MC not only had little effect on the soil physicochemical properties (e.g., pH, organic matter (OM), cation exchange capacity (CEC), ammonium nitrogen (AN), available phosphorus (AP) and rapidly available potassium (AK)), but also improved the restored soil. Furthermore, soil structure, surface elements and the enzyme activity did not exhibit significantly loss. Therefore, MC has great potential for remediating agricultural soil.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2019
·
IF 4.978
Jiling Zhao,Chen Wang,Shixing Wang,Yang Zhou
A new adsorbent (MOFs-DHAQ) was prepared by functionalizing UiO-66-NH 2 with 1,8-dihydroxyanthraquinone to remove Pb(II) from wastewater. The optimum pH, adsorption kinetics and adsorption isotherms were studied. MOFs-DHAQ has a good removal rate for Pb(III) at pH 4. It takes only 30 min to reach maximum adsorption capacity about 213.3 mg/g. The experimental data conforms to the pseudo-secondary kinetics and the Freundlich models. The adsorption process belongs to multilayer chemical adsorption . Desorption and adsorption experiments indicate that the adsorbent can be recycled at least four times. The rising temperature favors the adsorption of Pb(II) on MOFs-DHAQ because the adsorption process is a spontaneous endothermic reaction. The interaction mechanism between Pb(II) and the reactive group is mainly electrostatic interaction and complexation. MOFs-DHAQ has excellent selectivity for removing Pb(II) from wastewater contains a variety of interfering ions. The calculated adsorption capacity ( Q ex ) of Pb(II) for column adsorption was 108.04 mg/g and was consistent with the Thomas model's adsorption capacity( Q Th ) about 109.63mg/g. Density functional theory calculations show that MOFs-DHAQ combines with Pb(II) through monodentate N atoms and bidentate O groups. MOFs-DHAQ has good application prospect in the removal of lead from wastewater.
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SENSORS AND ACTUATORS A-PHYSICAL
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2023
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IF 4.6
Hui Jiang,Jinqi Chen,Jihong Deng,Xiang Zhao,Leijun Xu
This study provides a reference for rapid determination of heavy metal Pb in soybean oil by microwave detection technique. The microwave transmission coefficients of soybean oil samples with different concentrations of the heavy metal Pb were collected using a portable microwave detector made by our team. Three feature optimization methods, which were bootstrapping soft shrinkage (BOSS), competitive adaptive reweighted sampling (CARS), and variable combination population analysis (VCPA), were employed to select the features of microwave transmission coefficients after least square filtering, and partial least squares (PLS) models constructed on features selected were used to rapid determine the heavy metal Pb content in soybean oil. The results showed that the three variable optimization algorithms can screen out highly targeted features. Especially, the CARS-PLS model obtained the optimal generalization performance, and its coefficient of determination ( R P 2 ) and residual predictive deviation (RPD) were 0.9857 and 8.3838, respectively. The results reveal that it is feasible to use the microwave detection technique combined with appropriate chemometrics methods to determine the heavy metal Pb in soybean oil with high precision. This study provides a practical technique for nondestructive determination of heavy metal residues in edible oil .
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MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Yue Feng,Hongli Zhao,Tong Feng,Xue Liu,Minbo Lan
Cadmium (Cd) and lead (Pb) are two of the most toxic heavy metals, which cause serious pollution to the environment. It is of great significance to develop electrochemical sensing platforms that can be used for the efficient and simultaneous detection of Cd(II) and Pb(II). Herein, bismuth nanoparticles encapsulated in nitrogen-doped carbon nanosheets (Bi@NC) were successfully synthesized. An electrochemical sensor based on Bi@NC was proposed for the high-performance determination of trace Cd(II) and Pb(II). Encapsulated and uniformly distributed Bi nanoparticles with abundant active sites form alloys with Cd(II) and Pb(II), and the conductive nitrogen-doped carbon nanosheet accelerates the electron transport rate, thus the electrochemical signals of Cd(II) and Pb(II) are significantly amplified. Under optimized conditions, Cd(II) and Pb(II) can be simultaneously detected in concentrations ranging from 1 to 150 μg L −1 , with sensitivity of 0.48 μA μg −1 L and 0.36 μA μg −1 L, respectively. Meanwhile, the sensor possesses the outstanding advantages of ultra-high sensitivity, excellent selectivity, and storage stability, being able to serve as an electrochemical platform for Cd(II) and Pb(II) sensing in fruit and river water.
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JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
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2023
·Vol. 38
·期 10
·2127-2133
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IF 3.4
Shihao Wu,Linpei Dong,Jiahua Ji,Peng Zhao,Ge Song,Xiaojun Wu,Jifen Wang,Yunfeng Zhang,Jingjing Wang
Monochromatic excitation X-ray fluorescence (ME-XRF) spectrometry is an emerging technique for elemental analysis with many potential forensic applications. In this study, a method for rapid and efficient quantification of As, Hg, Tl, and Pb in biological tissues using ME-XRF was established and applied to actual cases. The instrument's operating conditions were optimized, and the optimum method for sample preparation was determined. According to the calibration curves of each element, a new model for the detection of biological tissues was developed based on the fundamental parameter (FP) method. The LOD values of As, Hg, Tl, and Pb were 0.04, 0.04, 0.06, and 0.07 μg g−1, respectively. Through systematic evaluation and validation, the feasibility of using ME-XRF in forensic toxicology analysis was confirmed.
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POLYMER COMPOSITES
·
2023
·Vol. 44
·期 11
·7876-7886
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IF 5.2
Xiao Zhan,Junzhuo Sun,Daohai Zhang
This study is aiming to prepare the porous PBAT/modified zeolite composite by the simple, rapid, and efficient method of preparing them by the solution coating process with modified zeolite as adsorbent, as well as with PBAT as carrying agents and with ethanol as porogenic agent. Some influencing factors for adsorbing PBAT/modified zeolite composite membrane in Lead-Ion-Heavy Metal wastewater were researched in this paper, including the effects of zeolite content, modifier type, initial pH, pore-making agent, adsorption time, adsorption temperature, initial concentration, and feeding quantity. In addition, the adsorption processes of the porous PBAT/modified zeolite composite membrane are studied by means of the adsorption kinetics and adsorption isotherm models. The finding shows the kinetic data were consistent with the pseudo-second-order model, and the data fitting of isothermal adsorption experiment is closer to the Langmuir adsorption model, which is a single-molecule adsorption process and belongs to chemisorption, with a saturation adsorption amount of about 106.3 mg/g. Therefore, zeolite has great prospects for the removal of Pb(II) in wastewater, and provides a theoretical basis for the efficient treatment of heavy metal-containing wastewater. Highlights A composite film that can effectively remove Pb(II) from water was prepared. The composite exhibits rational pore structure and high specific surface area. This composite has advantages of biodegradability and reproducibility.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Rui Zhang,Pengbin Wang,Qinghu Guo,Jiale Long,Taixiang Huang,Zhonghua Yao,Minghe Cao,Hanxing Liu,Hua Hao
Piezoelectric ceramics with high strain response and low hysteresis are highly in demand for high-performance actuator applications. Unfortunately, the trade-off relationship between large field-induced strain and low hysteresis in piezoelectric ceramics is a key challenge for designing high-performance piezoelectric actuators. Herein, y mol%La-doped 0.10 Pb(In 1/2 Nb 1/2 )O 3 - x PbZrO 3 -(0.90 – x )PbTiO 3 [0.10PIN- x PZ-(0.90-x)PT: y mol%La] ternary relaxor ferroelectric ceramics were prepared by conventional solid-state reaction technique. Pb(In 1/2 Nb 1/2 )O 3 (PIN) as a relaxor end member was introduced into (Pb,La) (Zr,Ti)O 3 (PLZT) system to improve relaxor characteristics and strain properties. A giant strain of 0.23% was obtained in 0.10PIN-0.59PZ-0.31 PT: 8mol%La ceramic at the electric field of 20 kV/cm, with a high piezoelectric d 33 * of 1150 pm/V and low hysteresis H y of 6.4%, exhibiting a potential application in high-performance piezoelectric actuators. Furthermore, the effects of La ion doping and components on the ferroelectric, dielectric and electric field-induced strain properties were investigated, and provides a new way for improve the strain properties of piezoelectric materials .
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Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 17
·5098-5110
·
IF 7
Yangwen Hou,Man Dong,Jingting He,Jing Sun,Chunyi Sun,Xiao Li,Xinlong Wang,Zhongmin Su
All-inorganic perovskite (CsPbBr3) nanocrystals (NCs) are exceptional candidates for photocatalysis due to their optimal band structure, high molar extinction coefficient, and long charge-carrier diffusion lengths. However, their inevitable instability and low charge transfer efficiency have prevented their widespread applications. A strategy that can improve both stability and charge separation efficiency is desperately required. Herein, by introducing an in situ structural transformation strategy, hydrophobic hierarchically porous CsPbBr3@Pb-MOF is obtained which exhibits high durability in water for more than 7 weeks and appealing thermal stability and resistance to anion intrusion. Meanwhile, abundant oxygen vacancies are detected which efficiently suppress the photogenerated charge recombination. As a result, impressive CO2 photoreduction activity is achieved with CsPbBr3@Pb-MOF as a catalyst. Through a gas–solid reaction (without sacrificial agents and photosensitizers), this CsPbBr3@Pb-MOF-2 composite exhibits a CO yield of 107 μmol g−1 h−1 with 99.2% selectivity under visible-light (λ > 420 nm) irradiation, surpassing most reported CsPbX3-based photocatalysts under similar conditions.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 29
·13985-13992
·
IF 3.3
Luo Xu,Fang Yang,Jiagen Li,Qihui Wang,Lin Du,Min Yang,Xiaohong Fu
In this work, an electrochemical sensor based on a highly efficient competitive method is proposed that uses SiO2-PNPG as an adsorbent for the efficient detection of Pb(II) in soil. The silica (SiO2) and N-phenylglycine (NPG) polymer (SiO2-PNPG), synthesized using a one-pot polymer method, was applied to construct specific metal electrochemical sensors with high sensitivity. The high sensitivity and good selectivity were accomplished in the determination of Pb(II) due to the selective penetration and accumulative effect of SiO2-PNPG. The correlation between the current response and the Pb(II) concentration presents a linear range from 2.12 to 15.78 μg mL−1 with a detection limit of 0.166 μg mL−1 (S/N = 3, R2 = 0.9987). The sensitivity, reproducibility and stability of this sensor are promoted due to the facilitated electron transfer.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
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2023
·
IF 3.4
Xue Su,Qiannan You,Linlin Zhuang,Zhimin Chang,Mingfeng Ge,Li Yang,Wen-Fei Dong
Circulating tumor cells (CTCs) are important prognostic markers for cancer diagnosis and metastasis, and their detection is an important means to detect cancer metastasis. Herein, we construct a novel bifunctional electrochemical biosensor based on the PB-MXene composite films. A simple electrostatic self-assembly approach was employed to prepare a film composed of PB nanocubes on the MXene substrates. Given that the PB is an artificial peroxidase for H 2 O 2 sensing, the PB-MXene films can realize the real-time monitoring of H 2 O 2 secretion from living CTCs. Besides, the anti-CEA attached biosensors can be utilized to quantify the corresponding CTCs. The synergic effects of the MXene with a large specific area and PB with enzyme-free catalysis for H 2 O 2 resulted in PB-MXene films exhibiting high electrocatalytic and low cytotoxicity for both H 2 O 2 sensing and living CTCs capturing. As a result, the biosensor shows a low detection limit of 0.57 μM towards H 2 O 2 with a wide linear range (1 μM to 500 μM), as well as an excellent sensing performance for CTCs (an extremely low detection limit of 9 cells/mL in a wide linear range of 1.3 ×10 1 to 1.3 ×10 6 cells/mL). Moreover, the prepared biosensor showed satisfactory stability and anti-interference ability for potential applications in clinical cancer diagnosis and tumor metastasis.
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