Food Analytical Methods
·
2019
·Vol. 12
·期 10
·2326-2333
·
IF 2.413
Zhang Wen,Liu Chao,Zou Xiaobo,Zhang Han,Xu Yiwei
This work introduces a β-cyclodextrin/multi-walled carbon nanotube (β-CD/MWCNT)–modified microelectrode array (MEA) for rapid determination of imidacloprid in vegetables. The MEA, fabricated on a silicon wafer, contains 20 parallel-connected working electrodes, a counter electrode and a reference electrode. The MWCNT is drop-casted onto the working electrode area, and β-CD is decorated onto the MWCNT layer with electropolymerization. Electrochemical behaviors of the as-fabricated sensor are investigated with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Obtained results validate that the proposed sensor has a large electroactive area, great electrical conductivity, and high sensitivity. During preparation and application of the sensor, 0.5 mg mL −1 MWCNT suspension and phosphate-buffered solution (0.1 mol L −1 , pH = 7) are found to optimize experimental conditions. Under optimized conditions, a wide linear range as 5 to 100 μmol L −1 is obtained for target imidacloprid, and the limit of detection (LOD, S/N = 3) is well defined as 0.629 μmol L −1 . The sensor is used for sensing imidacloprid in cabbage, cucumber, and tomato. The results from this method are in accordance with high-performance liquid chromatography-mass spectrometry (HPLC-MS) data.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Wenchao Niu,Pingxiao Wu,Lu Jiang,Zhongbo Shang,Quanyun Ye,Jiayan Wu,Yihao Li,Meiqing Chen,Saeed Rehman,Nengwu Zhu
Gobbinsite (GOBZ) is rare zeolite with a disordered framework cation distribution, which is likely beneficial to Cd(II) fixation. This study developed a simple hydrothermal crystallization route to synthesize the novel GOBZ using natural halloysite nanotubes minerals (HNTS). In micropore and mesoporous of BET data analysis, a large number of HNTS microporous structures transformed into GOBZ mesoporous structures, which could greatly facilitate the adsorption ability of GOBZ. The XPS and FTIR exhibited the mesoporous coordination and the interaction of different hydroxyl functional groups, is the main adsorption mechanism to strengthen the Cd(II) fixation capacity. Liu isotherms described well of the adsorption of Cd(II), indicating the process was heterogeneous and multilayers simultaneously. General order kinetics assumed that the adsorption occur accompanied by a chemical reaction on GOBZ. Reusability of GOBZ show that it has good recycling performance and application value in Cd(II) adsorption. The TEM and XRD showed that the adsorption of Cd(II) affected the elemental composition, surface morphology and internal structure of GOBZ, which contributed to in-situ formation of phillipsite-Ca, otavite, garronite and gmelinite-Na. Above all, hydrothermal crystallization (GOBZ technology) can provide viable options for the removal of toxic metal pollution, showing the prospect of clay minerals in the removal.
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APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Jiangxin Xiang,Runliang Zhu,Qingze Chen,Guocheng Lv,Yixuan Yang
The development of clay mineral-based soil amendments has drawn significant concerns in modern agriculture . However, little attention was paid to multifunctional amendments enabling both soil remediation and nutrients sustained release. In this work, a novel montmorillonite (Mt)-based amendment (denoted as KMt-P) was developed by modifying Mt with alkali followed by decoration with phosphate, and was further applied to remediate Cd/REEs contaminated soil. The XRD pattern of KMt-P demonstrated the presence of various silicophosphate and aluminophosphate phases. 27 Al and 29 Si MAS NMR results indicated the destruction of crystal structure of Mt. FTIR and XPS analyses confirmed the formation of Si-O-P, P-O-P, and Al-O-P bonds in KMt-P, which, as we envisioned, should be conductive to the immobilization of Cd and sustained release of nutrients. The addition of KMt-P to soil (1 wt%) could effectively reduce the bioavailable Cd in soil by 91.3% within 30 days. Sustained release of multiple nutrients was also achieved: the concentration of soluble K, Si, and P increases by 15, 3, and 135 times, respectively, in comparison with the control treatment. The increased K and P contents arose from the added modifiers, and that of Si could be ascribed to the destruction of Mt crystal structure under alkali attack. Application of only 1% KMt-P could reduce the concentrations of 17 REEs in the soil by 92.01%–98.89%. In general, KMt-P has proven a promising multifunctional amendment enabling both Cd/REEs immobilization and sustained release of nutrients.
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Journal of Chemistry
·
2020
·Vol. 2020
·期 1
·5496712
·
IF 1.79
Yingying Zhao,Linchuan Zhan,Zhongjun Xue,Kianpoor Kalkhajeh Yusef,Hongxiang Hu,Mengjun Wu
Natural macromolecule adsorbing materials are alternatives for remediation of heavy metals’ polluted waters. In this study, sodium alginate composite gel (SACL) was synthesized from sodium alginate (SA), polyethylene glycol oxide (PEO), and nanomaterials to remove wastewater Cu (II) and Cd (II). The adsorption efficiency of SACL was analysed in relation to the contact time, initial concentrations of metal ions, temperature, adsorbent dosage, and solution pH. Three models, i.e., kinetic model, isothermal adsorption model, and thermodynamic model, were used to fit the experimental data. Our results showed that the highest removal rates of Cu (II) and Cd (II) from wastewater were 96.8% and 78%, respectively, under the condition of the best liquid-solid ratio of 12.5 ml·g −1 , and the contact time of 180 min (25°C). Overall, the SACL adsorption of Cu (II) and Cd (II) was spontaneous. The adsorption kinetics and the isothermal adsorption were fitted well with the pseudo-second-order kinetic equation and Langmuir equation, respectively. Combined with SEM-EDS and FTIR analysis, results suggested that SACL adsorbs wastewater Cu (II) and Cd (II) mainly through chemical reaction on its surface area. Altogether, this work concludes on SACL as an efficient and ecofriendly adsorbent for wastewater Cu (II) and Cd (II).
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FOOD RESEARCH INTERNATIONAL
·
2026
·
IF 8.8
Zhenglong Chen,Zhile Zhao,Yuxin Bu,Xinyan Yang,Yulin Fang,Hui Lin,Yudong Lu
An HP-β-CD-functionalized hydrogel SERS strategy was developed for white tea storage-year analysis. • HP-β-CD-assisted capture and Ag-hotspot SERS sensing of tea polyphenols were mechanistically discussed. • Agarose improved nanoparticle dispersion and signal uniformity. • Sample-level machine learning enabled internal storage-year discrimination of the tested white tea samples. • External validation using multi-origin samples is still required to confirm practical robustness. Accurate discrimination of white tea storage years is important for quality evaluation, authenticity control, and market regulation. In this study, an HP-β-CD-functionalized hydrogel surface-enhanced Raman scattering (SERS) substrate was developed for rapid storage-year discrimination of white tea. Hydroxypropyl-β-cyclodextrin-functionalized silver nanoparticles (HP-β-CD/Ag NPs) were incorporated into an agarose hydrogel to construct an HP-β-CD/Ag NPs/AG substrate. HP-β-CD was designed to promote the local capture of aromatic and polyphenolic tea components near SERS-active Ag hotspots, while the agarose hydrogel improved nanoparticle dispersion and signal uniformity. The optimized substrate retained distinguishable SERS responses for epigallocatechin gallate and quercetin at 10 −7 mol L −1 and showed good signal uniformity, with a relative standard deviation of 6.96%. White tea samples from seven storage years between 2011 and 2023 were analyzed, including 10 independent samples per year and 10 spectra per sample. Principal component analysis showed that the first three principal components explained 98.94% of the spectral variance. Under 50 repeated tea-sample-level splits, machine-learning models achieved stable internal storage-year discrimination, with sample-level accuracies ranging from 97.62% to 100.00%. A sample-level permutation test further indicated that the classification performance was unlikely to result from random label association. These results suggest that the proposed hydrogel SERS strategy can provide a rapid and fingerprint-based approach for white tea storage-year discrimination, although further external validation using more diverse samples is still required. Download: Download high-res image (179KB) Download: Download full-size image
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ACS Applied Nano Materials
·
2026
·Vol. 9
·期 34
·16444-16456
·
IF 5.8
Zhang Lin,Xiao Xiang,Cheng Zirui,Hou Xiaoying,Du Hongzhi
Cadmium
(Cd 2+ ), among the most hazardous heavy-metal
pollutants, enters ecosystems through both natural processes and anthropogenic
activities. This study developed an electrochemical sensor using a
two-dimensional nanomaterialcomposite strategy, which synergistically
integrates ion-imprinted poly(3,4-ethylenedioxythiophene) (IIP-PEDOT)
with graphite carbon nitride (g-C 3 N 4 ) nanomaterials
for ultrasensitive Cd 2+ detection. First, the IIP film
was fabricated via electropolymerization of EDOT monomers on a g-C 3 N 4 -modified screen-printed carbon electrode (SPCE),
leveraging hydrophobic interactions and π–π conjugation
effects between EDOT molecules and g-C 3 N 4 nanosheets.
Subsequently, density functional theory (DFT) simulations elucidated
the energy changes of the polymerization-complex structure formed
by Cd 2+ with functional monomers, while also clarifying
the coordination binding mechanisms between metal ions and recognition
sites within imprinted cavities. Scanning electron microscopy (SEM)
and X-ray photoelectron spectroscopy (XPS) were systematically employed
to characterize the morphological features and chemical composition
of the IIP-PEDOT/g-C 3 N 4 nanocomposite material,
validating the uniform dispersion of PEDOT polymer chains on the g-C 3 N 4 nanocarrier and confirming the stability of
interfacial interactions. Experimental results demonstrated that the
sensor exhibited superior selective Cd 2+ recognition capability
with a remarkably low detection limit of 75 ng/L (0.67 nM) across
a linear range of 0.01–10 μM, substantially outperforming
EU drinking-water regulatory thresholds (approximately 45 μM),
reflecting the superiority of the sensor. Furthermore, biological
validation based on mouse-exposure models confirmed that the sensor
could accurately reflect Cd 2+ accumulation levels in blood,
liver, and kidney tissues. Additionally, the sensor demonstrates outstanding
detection capabilities in the human blood environment, suggesting
promising clinical biosample analysis applications. In brief, this
IIP-PEDOT/g-C 3 N 4 nanocomposite sensing platform
offers a cost-effective, rapid, and field-deployable solution for
monitoring Cd 2+ contamination in environmental and biomedical
matrices.
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Pharmaceutics
·
2025
·Vol. 17
·期 11
·1410
·
IF 5.5
Pin Lv,Yamin Li,Gang Du,Jiawei Ding,Jiawei Zhou,Yuan Zhang,Huang Lin,Ming Yang,Chao Zhou,Bo Yang
Background/Objectives:Lipid nanoparticles (LNPs) have demonstrated notable clinical success as advanced drug delivery systems. However, the development of novel covalently bonded ionizable lipids faces substantial technical challenges, as their modification is difficult and they have a high molecular weight. To address this issue, we report the use of host–guest complexes in supramolecular chemistry as functional lipid motifs for constructing LNPs.Methods:Ionizable amine β-cyclodextrin (amine β-CD)-derived host–guest amphiphilic lipid molecules (HGLs) were designed for the construction of multi-stage assembly supramolecular LNPs (MSLNPs). The structure–function relationships and stability of MSLNPs were explored by screening eight types of amine β-CDs and varying the ratio of HGL to yolk phosphatidylcholine. Stability screening and molecular dynamics simulations were performed to clarify the self-assembly mechanisms and optimal formulations, followed by a systematic evaluation of delivery performance.Results:MSLNPs showed a high drug-loading efficiency (> 30%), a rapid-response release in acidic environments, and multi-pathway cellular uptake. In vivo delivery experiments using ethylenediamine β-CD-based MSLNPs in mice revealed no significant immunogenicity, no significant abnormalities in organs/tissues or their functions, a unique biodistribution pattern, and pronounced renal targeting. The successful development of MSLNPs with acidic pH-responsive control, a high delivery efficiency, and renal-targeting properties simplifies LNP preparation.Conclusions:This study offers novel insights into the design of simplified LNPs and the optimization of targeted delivery, with potential applications in renal disease therapy.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Peipei Meng,Qianya Zhou,Na Zhang,Lijuan Zhang,Liuchun Zheng
In this study, a green and sustainable synthesis strategy was developed to fabricate cellulose-based composite adsorbents by replacing the organic dispersion system previously used with an aqueous medium. Two inorganic fillers, sepiolite and TiO₂, were respectively incorporated to prepare cellulose-sepiolite (CgS(H₂O)) and cellulose-TiO₂ (CgT(H₂O)) composites, aiming to investigate the influence of mineral type and dispersion phase on Cd(II) adsorption performance and mechanism. Compared to the earlier reported CAT material synthesized in organic media, both aqueous-phase composites showed enhanced porosity, surface functionality, and carboxyl group distribution. CgS(H₂O) exhibited a fluffy, porous network structure with high micro/mesopore connectivity, achieving a maximum Cd(II) capacity of 239.45 mg/g. CgT(H₂O), with higher surface area and Ti–O active sites, demonstrated the highest capacity of 368.82 mg/g, significantly surpassing CAT (105 mg/g). Kinetic and isotherm analysis revealed that CgS(H₂O) followed multilayer chemisorption, while CgT(H₂O) conformed to monolayer Langmuir-type adsorption. Density functional theory (DFT) simulations further indicated stronger binding affinities and more active carboxyl-dominant sites in CgT(H₂O), while CgS(H₂O) benefited from networked carboxyl groups and Si–O-based interaction domains. These findings collectively highlight that the aqueous dispersion strategy, combined with targeted mineral selection, enhances not only environmental friendliness but also material structure and adsorption efficiency, offering a versatile platform for efficient heavy metal removal from water.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jianwei Zhang,Yuting Wang,Xutong Wang,Wenzhu Wu,Xiaoqiang Cui,Zhanjun Cheng,Beibei Yan,Xiaoe Yang,Zhenli He,Guanyi Chen
The harmless treatment of heavy metal-enriched hyperaccumulator biomass is the main barrier to the industrialization of phytoremediation . Hydrothermal conversion of Sedum alfredii using different solvents (i.e ·H 2 O and HCl) at 210–300 ℃ was performed to investigate the behaviors of Cd and Zn, and the characteristics and potential application of the derived hydrochars were determined. Low temperature and HCl addition favored the removal of Cd/Zn from the solid phase. The highest removal efficiencies of Cd (95.0%) and Zn (89.3%) were achieved at 210 ℃ with the presence of HCl. The yield, pH, ash content, element concentration, functional groups, and crystalline minerals of the derived hydrochar were influenced by the reaction temperature and addition of HCl. The leaching risk of Cd and Zn was significantly reduced by hydrothermal conversion. The addition of HCl facilitated the immobilization of Zn, while it enhanced the mobility of Cd. Moreover, the hydrochar derived at 210 ℃ showed increased sorption capacity towards Cu, and the addition of HCl greatly improved the energy density of hydrochar. These results suggest that HCl-mediated hydrothermal conversion could be a promising technique to achieve the separation of Cd and Zn from hyperaccumulator biomass as well as the production of value-added hydrochar.
研究领域:
环境科学
·
生物修复
·
废物处理
·
生物能源
·
重金属化学
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ENVIRONMENTAL RESEARCH
·
2026
·
IF 8.2
Bin Wang,Chuang He,Qiqi Zheng,Li Cao,Shaoyi Wang,Haijie He,Kai Cui,Wenjie Zhang
Heavy metal contamination in soils poses serious threats to the environment and human health. Cement-based solidification/stabilization (S/S) is a common method for treating heavy metal-contaminated soils due to its simplicity and effectiveness. However, the immobilization efficiency of conventional cement systems is limited. In this study, low-cost and highly dispersible novel carbon nanodots (CNDs) are synthesized from citric acid and urea by a microwave-assisted method and added to cement systems to improve the immobilization of Pb and Cd. Leaching results show that, with 15 wt.% cement, the addition of 0.4 wt.% (by weight of cement) CNDs reduces the leaching concentrations of Pb and Cd by 77.3% and 71.8%, respectively. Leaching results and Tessier analyses show that CNDs promote the transformation of Pb and Cd from exchangeable to stable forms and improve chemical stability. XRD, FTIR, DTG, and SEM results show that CNDs accelerate cement hydration and promote the formation of C–S–H gels, which enhances physical encapsulation. FTIR, UV-Vis, and adsorption results further indicate that oxygen- and nitrogen-containing groups on CNDs complex with Pb 2+ and Cd 2+ and strengthen chemical immobilization. This study provides a cost-effective nanomaterial for improving the immobilization of Pb and Cd in cement-based systems and offers new directions for the application of CNDs in sustainable environmental materials.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Yonglin Liu,Shuran He,Hanfei Gao,Xinyi Wang,Qingjian Zhang,Wei Tian,Baorong Duan,Lin Liu
s The study investigated the removal of Cr(Ⅲ) and Cd(Ⅱ) by argillaceous limestone (AL) in a binary adsorption system. The results indicate that AL’s capacity to adsorb Cr(Ⅲ) is enhanced by the presence of Cd(Ⅱ). Conversely, the presence of Cr(Ⅲ) significantly decreases the adsorption of Cd(Ⅱ). The adsorption mechanisms involve precipitation, chelation, and ion exchange. AL’s adsorption behavior was well described by the pseudo-second-order kinetic model, suggesting that the adsorption process was dominated by chemical interactions and the monolayer adsorption pattern. The pH affects adsorption primarily by altering the protonation degree of the AL surface. In the single-component system, the maximum adsorption capacity for Cr(III) reached 30.98 mg·g⁻ 1 at pH 7.0, while that for Cd(Ⅱ) reached 38.80 mg·g⁻ 1 at pH 8.0. In the binary system, Cr(Ⅲ) achieved its highest adsorption capacity (42.56 mg·g⁻ 1 ) at pH 6.0, while Cd(Ⅱ) exhibited a maximum capacity of 19.16 mg·g⁻ 1 at pH 7.0. The presence of Na⁺ and Ca 2 ⁺ ions reduced the adsorption efficiency, with greater inhibition observed as ionic strength increased. This study clarifies the composite adsorption behavior of AL in multi-ion systems and can advance the direct application of natural minerals in environmental pollution remediation.
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Desalination and Water Treatment
·
2024
·
IF 1
Youning Chen,Shuang Jia,Wei Zhao,Juan Song,Yuhong Li,Huan Wang
A novel ethylenediamine chelating resin (PEDA-g-PS) was prepared by grafting poly (glycidyl methacrylate) onto the chloromethylated polystyrene beads via surface-initiated atom transfer radical polymerization (SI-ATRP), and followed by the ring-opening reaction of epoxy and amine groups. The resin was characterized by infrared spectroscopy, scanning electron microscopy and elemental analysis. The adsorption property for Cu(II) and Cd(II) on the resin was examined. By analyzing adsorption isotherm, adsorption kinetics and the influence of solution pH on the adsorption capacity, the adsorption of Cu(II) and Cd(II) on PEDA-g-PS resin was proved to be Langmuir single-layer adsorption model, and adsorption process conformed to pseudo-second-order kinetic equation. The maximum adsorption capacities for Cu(II) and Cd(II) could reach 1.19 and 1.95 mmol·g –1 at pH 3.0 by fitting Langmuir model. The adsorption of the Cu(II) and Cd(II) was hardly affected by common coexisting ions such as Na (I), K (I), Ca (II) and Mg (II), whereas they were slightly decreased when Fe (II) and Zn (II) coexisted in the solution, which illustrated the selective adsorption of Cu(II) and Cd(II) from wastewater. After ten adsorption–desorption cycles, the adsorption capacity of the resin did not change significantly, indicating that the resin exhibited excellent adsorption properties for heavy metal ions and excellent reusability.
研究领域:
环境科学
·
高分子化学
·
水处理
·
重金属去除
·
吸附技术
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