JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Chaojian Zhang,Tianrui Yang,Junsheng Liu,Qianqian Duan,Jiahui Song,Youjun Yin,Hansong Wang
Novel poly(ethylene imine) (PEI) modified chitosan-based hybrid membranes (PMCHMs) were created via a soft chemistry method, in which unmodified chitosan (CS) firstly reacted with PEI to produce a CS-PEI precursor. Later, such CS-PEI precursor was blended with silicone to create the membrane solution of PMCHMs. Finally, PMCHMs could be obtained via phase-inversion process. Multi-component sorption of Pb 2+ , Cu 2+ and Ni 2+ on PMCHMs in metal mixed solutions, such as, Pb 2+ &Cu 2+ and Pb 2+ &Ni 2+ binary, Pb 2+ , Cu 2+ and Ni 2+ ternary, as well as Pb 2+ , Cu 2+ , Ni 2+ , Cd 2+ and Cr 3+ quintuple mixed solutions, was inspected. The calculation of effective diffusion coefficients, distribution coefficients and selectivity coefficients showed that Pb 2+ sorption on PMCHMs had excellent selectivity in these mixed multi-metal solutions. While, the calculation of activation energy proved that Pb 2+ , Cu 2+ and Ni 2+ sorption on PMCHMs was a physic-sorption process Also, mechanism insight reveals that Pb 2+ sorption on PMCHMs could be depicted via Lagergren pseudo-2nd-order kinetic model and Langmuir or Freundlich isotherm equation. Exclusively, intra-particle diffusion process was discussed in detail. Desorption testing verified that HCl is a good desorbent for metals sorption on PMCHMs and the cycle time of membranes can arrive at 6 times. These results demonstrate that PMCHMs can be used to preferentially eradicate Pb 2+ from metal mixture solutions, showing prospective applications in the treatment of metal mixture wastewater from waste vehicle power-battery and other various metal-bearing polluted water.
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Biosensors-Basel
·
2022
·Vol. 12
·期 9
·745
·
IF 5.743
Li Gao,Yixi Deng,Haolu Liu,King Solomon,Bianjiang Zhang,Huimei Cai
Tea is an important economic crop and health beverage in China. The presence of heavy metal ions in tea poses a significant threat to public health. Here, we prepared an aptamer biosensor labelled with AIEgen nanospheres to detect Pb2+in tea. The dsDNA modified by amino and phosphoric acid was combined with the carboxylated AIEgen NPs to form AIEgen-DNA with a fluorescence group, which was then fixed to the surface of Zr-MOFs to quench the fluorescence of AIEgen NPs. At the same time, PEG was added to remove nonspecific adsorption. Then Pb2+was added to cut the DNA sequences containing the cutting sites, and AIEgen NPs and part of the DNA sequences were separated from the Zr-MOFs surface to recover the fluorescence. By comparing the fluorescence changes before and after adding Pb2+, the detection limit of Pb2+can reach 1.70 nM. The fluorescence sensor was applied to detect Pb2+in tea, and the detection results showed that the tea purchased on the market did not contain the concentration of Pb2+within the detection range. This study provides new insights into monitoring food and agriculture-related pollutants based on fluorescent biosensors.Keywords:lead ions;fluorescent biosensors;metal-organic frames;tea
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Guangyuan Chen,Tong Zhou,Meng Zhang,Zhongxiang Ding,Zhikun Zhou,Yuanhui Ji,Haiying Tang,Changsong Wang
Struvite (MAP) crystallization technology is widely used to treat ammonia nitrogen in waste effluents of its simple operation and good removal efficiency. However, the presence of heavy metal ions in the waste effluents causes problems such as slow crystallization rate and small crystal size, limiting the recovery rate and economic value of the MAP. The present study was conducted to investigate the effects of concentrations of three heavy metal ions (Cu 2+ , Zn 2+ , and Pb 2+ ) on the crystal morphology, crystal size, average growth rate, and crystallization kinetics of MAP. A relationship was established between the kinetic rate constant K t calculated by the chemical gradient model and the concentrations of heavy metal ions. The results showed that low concentrations of heavy metal ions in the solution created pits on the MAP surface, and high level of heavy metal ions generated flocs on the MAP surface, which were composed of metal hydroxides, thus inhibiting crystal growth. The crystal size, average growth rate, MAP crystallization rate, and kinetic rate constant K t decreased with the increase in heavy metal ion concentration. Moreover, the K t demonstrated a linear relationship with the heavy metal concentration ln( C / C* ), which provided a reference for the optimization of the MAP crystallization process in the presence of heavy metal ions.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
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IF 7.46
Ying Li,Huan Huang,Rongli Cui,Dongmei Wang,Zi Yin,Dan Wang,Lirong Zheng,Jing Zhang,Yidong Zhao,Hui Yuan,Jinquan Dong,Xihong Guo,Baoyun Sun
In this work, graphdiyne, a new kind of carbon allotrope composed of sp and sp 2 hybridized carbon atoms, firstly worked as an effective electrochemical sensor for the determination of low concentration of Cd 2+ and Pb 2+ in water using electrochemical pre-enrichment and anodic-stripping voltammetry methods. The limit of detection was 0.46 nM for Cd 2+ and 1.72 nM for Pb 2+ with a linear range extended from 0.01 μM to 1 μM. This graphdiyne modified electrode also presented excellent selectivity, stability, applicability and reproducibility, providing a simple and promising platform to develop novel electrochemical sensor for detecting Pb 2+ and Cd 2+ with higher performance. Through X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) and X-ray absorption near edge structure (XANES) characterization, it was verified that the acetylenic links in graphdiyne served as adsorbent sites by providing electrons to bind with heavy metal ions, which enhanced the electrochemical sensing performance.
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Royal Society Open Science
·
2020
·Vol. 7
·期 10
·
IF 2.646
Zheng Wang,Xique Wu,Shengxu Luo,Yanshi Wang,Zhuang Tong,Qin Deng
Nanoscale zero-valent iron (NZVI) has a high adsorption capacity for heavy metals, but easily forms aggregates. Herein, preprocessed undulating venus shell (UVS) is used as support material to prevent NZVI from reuniting. The SEM and TEM results show that UVS had a porous layered structure and NZVI particles were evenly distributed on the UVS surface. A large number of adsorption sites on the surface of UVS-NZVI are confirmed by IR and XRD. UVS-NZVI is used for adsorption of Pb2+ and Cd2+ at pH = 6.00 in aqueous solution, and the experimental adsorption capacities are 29.91 and 38.99 mg g−1 at optimal pH, respectively. Thermodynamic studies indicate that the adsorption of ions by UVS-NZVI is more in line with the Langmuir model when Pb2+ or Cd2+ existed alone. For the mixed solution of Pb2+ and Cd2+, only the adsorption of Pb2+ by UVS-NZVI conforms to the Langmuir model. In addition, the maximum adsorption capacities of UVS-NZVI for Pb2+ and Cd2+ are 93.01 and 46.07 mg g−1, respectively. Kinetic studies demonstrate that the determination coefficients (R2) of the pseudo first-order kinetic model for UVS-NZVI adsorption of Cd2+ and Pb2+ are higher than those of the pseudo second-order kinetic model and Elovich kinetic model. Highly efficient performance for metal removal makes UVS-NZVI show potential application to heavy metal ion adsorption.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 11
·1-9
·
IF 6.232
Wu Weihao,Fan Yaofang,Tan Bing,Zhao Huimin
With the merits of low cost, simple synthesis procedure, and high affinity for metal ions, deoxyribozyme (DNAzyme) have played important roles in metal ions detection. However, the intracellular applications of DNAzyme are limited because of enzymatic degradation and inefficient cellular uptake. To address these problems, GR-5 as model DNAzyme was encapsulated into zeolitic imidazolate frameworks-8 (ZIF-8) nanoparticles by biomimetic mineralization. The positively charged ZIF-8 with high DNAzyme loading capacity retained their ability to enter cells. Compared with free DNAzyme, the biomimetic mineralization synthesis method has greatly improved the stability of pristine DNAzyme. The as-synthesized DNAzyme@ZIF-8 composite exhibited good stability resisting DNase I, and was used as a sensitive fluorescent nanoprobe for Pb 2+ determination and successfully achieved selective and sensitive determination for Pb 2+ at λ ex / λ em = 494/522 nm in real samples. The linear range for the determination of Pb 2+ is 50 to 500 nM. Moreover, the highly active DNAzyme delivered by ZIF-8 allows noninvasive imaging of Pb 2+ measurement in living cells. This strategy will extend the suitability of functional nucleic acids for in vitro and in vivo bioanalysis and bioimaging.
Graphical abstract
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JOURNAL OF POLYMER RESEARCH
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2020
·Vol. 27
·期 7
·1-10
·
IF 2.426
Li Paiwei,Dai Xin,Yan Qilin,Wang Zhenxi,Zhang Shangxi,Cao Meng
Dithizone is known to be very effective for heavy metal ions retention and widely used as developer in detection methods. To explore a novel surface modified polymer microspheres, this paper prepared a novel modified polystyrene (PS-g-D) microspheres by grafting dithizone as the complexing agent and developer on the surface of PS microspheres. The structure of PS-g-D was analyzed by FT-IR, and the formation of dithizone grafted PS microspheres was proved. The thermal stability and surface morphology of PS and modified PS were studied by TGA and SEM. PS-g-D had a uniform diameter of about 1 μm and exhibited a good thermal stability. The Pb 2+ removal increased and reached up to 99% with the decrease of initial Pb 2+ concentrations. The study of the isotherms model showed that the adsorption between PS-g-D and Pb 2+ is consistent with the Langmuir and Temkin adsorption isotherm models. The adsorption kinetics of PS-g-D is described well by the pseudo-second-order model. It can be seen that the modified PS microspheres exhibit a good adsorption property, and has real potential as a novel adsorbent for water treatment industry due to the introduction of dithizone as complexing agent and developer.
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CHINESE CHEMICAL LETTERS
·
2019
·
IF 3.839
Yuan Liu,Taotao Li,Chuxuan Ling,Zhu Chen,Yan Deng,Nongyue He
An electrochemical sensor based on self-made nano-porous pseudo carbon paste electrode (nano-PPCPE) has been successfully developed, and used to detect Cd 2+ and Pb 2+ . The experimental results showed that the electrochemical performance of nanoPPCPE is evidently better than both glassy carbon electrode (GCE) and pure carbon paste electrode (CPE). Then the prepared nano-PPCPE was applied to detect Cd 2+ and Pb 2+ in standard solution, the results showed that the electrodes can quantitatively detect trace Cd 2+ and Pb 2+ , which has great significance in electrochemical analysis and detection. The linear ranges between the target ions concentration and the DPASV current were from 0.1–3.0 μmol/L, 0.05–4.0 μmol/L for Cd 2+ and Pb 2+ , respectively. And the detection limits were 0.0780 μmol/L and 0.0292 μmol/L, respectively. Moreover, the preparation of the nano-PPCPE is cheap, simple and has important practical value.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 10
·10174-10187
·
IF 2.914
Ren Hong-shan,Cao Zhan-fang,Wen Xin,Wang Shuai,Zhong Hong,Wu Zai-Kun
In this paper, a magnetic nano-Fe 3 O 4 /triethanolamine/GO composite (TEA-GO-FE) was prepared by using graphene oxide (GO), triethanolamine (TEA), and ferric chloride. The result indicates that triethanolamine acted as an important role for the growing of Fe 3 O 4 and adsorption ability of composite material. The synthesis mechanism of TEA-GO-FE was investigated through the medium of SEM-EDS, XRD, FT-IR, and TEM. The characterization results indicated Fe 3 O 4 nanoparticles have been successfully loaded on the surface of graphene oxide and they were encapsulated by TEA and have excellent stability. According to the results of XRD, the general particle size of Fe 3 O 4 on TEA-GO-FE was 27.5 nm. In order to understand the adsorption properties of TEA-GO-FE for Pb 2+ and Cu 2+ , this article uses a static adsorption study method. The optimized adsorption conditions are as follows: pH = 5.0, temperature is 293.15 K, and the ion concentration is 100 mg/L. Under the optimized prerequisites, the adsorption capacities of Pb 2+ and Cu 2+ were 121.5 mg/g and 68.7 mg/g, separately. Through thermodynamic as well as kinetic studies, the adsorption process of Pb 2+ and Cu 2+ on TEA-GO-FE is a self-heating process.
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Nano Research
·
2018
·Vol. 11
·期 7
·3648-3657
·
IF 7.994
Xu Jing,Jie Xu,Xie Fengfeng,Yang Haimei,Wei Weili,Xia Zhining
A new type of self-targeting carbon dot (CD-Fla) for the detection of the toxic heavy metal ion Pb 2+ was synthesized via a one-pot hydrothermal route using flavonoid extracts of Ginkgo biloba leaves as the starting material. As-prepared CD-Fla exhibited excellent biocompatibility and strong blue emission with a quantum yield of 16.1% and significant fluorescence quenching selectivity for Pb 2+ without using any additional targeting molecules. CD-Fla could detect Pb 2+ quantitatively within the range 0.1–20.0 nM, with an ultrahigh sensitivity of 55 pM. The selectivity of CD-Fla for Pb 2+ was nearly one order of magnitude higher than that for other relevant metal ions. This was much better than ever reported CD-based metal ion sensors. The high sensitivity and selectivity were due to the incorporation of certain flavonoid-like moieties into CD-Fla. CD-Fla was also demonstrated to be a good probe for fluorescence tracing of intracellular Pb 2+ . The capability of CD-Fla was further improved when it was doped on agarose hydrogel. CD-Fla-doped agarose hydrogel (CD-AHG) allowed for visual fluorescence detection and removal of Pb 2+ from water. This was confirmed by testing CD-AHG in actual water samples taken from the Jialing River (Chongqing, China). The Pb 2+ adsorbed CD-AHG was regenerable in HCl solution. This study will open a new avenue for synthesizing intelligent materials capable of simultaneously targeting, detecting, and treating 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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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2026
·
IF 9.2
Taijia Li,Guichun He,Mengfei Liu,Zhiwen Cao,Jie Min
The management of mine tailings and remediation of lead (Pb) pollution represent significant global challenges. This study presents a sustainable approach by converting lithium porcelain clay tailings (LPCT) into highly crystalline Na-faujasite zeolite for efficient Pb 2+ removal. The synthesis conditions were optimized, and the framework evolution mechanism was elucidated: four-membered rings → six-membered rings → β-cages → faujasite supercages → crystalline faujasite. The synthesized zeolite exhibited a high Pb 2+ adsorption capacity of 584.12 mg/g and a removal efficiency of 99.7%. In actual mining area groundwater, it achieved over 99% Pb 2+ removal with a high distribution coefficient (K d ) of 3.3 × 10 5 mL/g, demonstrating excellent selectivity. Mechanistic studies revealed that ion exchange serves as the primary adsorption mechanism (contributing approximately 78%), supplemented by electrostatic interactions and surface complexation. The zeolite structure remained stable and could be effectively regenerated using 1 M NaCl, maintaining a high adsorption capacity (>85%) after five consecutive cycles. Preliminary environmental benefit analysis indicates that this "waste-to-resource" approach not only reduces tailings disposal but also exhibits a significantly lower carbon footprint compared to conventional zeolites and activated carbon during synthesis, highlighting its circular economy and environmental synergies. The study further discusses the potential and challenges for the industrial-scale application of this technology. This work provides a dual-benefit strategy for tailings valorization and effective remediation of Pb 2+ -contaminated water.
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DESALINATION
·
2026
·
IF 9.9
Xueping Chen,Hao Li,Jianming Pan
Silica nanocapsules hold significant importance in agriculture, medicine and machinery owing to their high specific surface area, tunable surface properties and superior loading capacity. However, the industrial-scale production of silica nanocapsules with controllable morphology is still constrained by the challenges of precise morphology control and straightforward functional modification. To bridge this gap, we propose a novel continuous and scalable approach that integrates vapor condensation nanoemulsification with hydrolysis and condensation kinetics, enabling the controllable synthesis of functional silica nanostructures in one step. Precise control over the sample morphology (including solid spheres, nanocapsules and hollow hemispheres) and architecture (shell thickness) were achieved by tuning the concentration of silane coupling agents, condensation time and Span 80 dosage. Notably, the gyrification-inspired silica nanocapsules with wrinkled surface exhibited excellent lead removal performance (removal efficiency of 99.7%), combining high adsorption capacity (567.0 mg g −1 ) with rapid kinetics (20 min). This work not only provides a scalable platform for the industrial fabrication of morphology-controllable silica but also offers fundamental insights into silica growth mechanisms, thus paving the way for the design of silica functional materials in environmental and industrial applications.
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