Toxics
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2026
·Vol. 14
·期 9
·787
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IF 4.9
Xin Tan,Yilan Li,Lina Xu,Jing Tian,Jiaqi Tan,Jiuli Ruan,Yang He
Biochar has been widely applied for immobilization of potentially toxic elements (PTEs) in contaminated soils; however, its effects on metal transport under transient unsaturated conditions remain insufficiently understood. This study investigated the adsorption, desorption, and transport behavior of Pb2+and Cd2+in biochar-amended soils by combining batch experiments, unsaturated conditions column experiments, and transport modeling. The adsorption kinetics, isotherms, and desorption characteristics of Pb2+and Cd2+were evaluated under different biochar levels, and their redistribution during unsaturated infiltration was further analyzed using soil–water-dependent models. Biochar increased the apparent adsorption capacity of both metals, with a stronger response observed for Pb2+than Cd2+. The Elovich and two-constant models provided better statistical descriptions of adsorption kinetics than the pseudo-second-order model, indicating that adsorption rate behavior involved heterogeneous and multi-rate processes. Freundlich fitting showed that Pb2+and Cd2+exhibited non-ideal adsorption behavior, while desorption experiments demonstrated a stronger reduction in apparent Pb2+release compared with Cd2+under biochar. Under transient unsaturated infiltration, Pb2+and Cd2+exhibited distinct transport patterns. Pb2+redistribution was adequately described by a linear partitioning relationship, with R2values ranging from 0.988 to 0.990, indicating relatively stable solid–liquid partitioning within the tested conditions. In contrast, Cd2+showed stronger dependence on soil–water conditions, and an empirical nonlinear water-dependent model improved model performance, increasing R2values from 0.533–0.652 for the linear model to 0.903–0.973. The results suggest that biochar effects on potentially toxic element migration under unsaturated conditions are element-specific, involving both apparent sorption enhancement and water-dependent redistribution processes. This study highlights that biochar performance in potentially toxic elements remediation should not be evaluated solely based on equilibrium adsorption capacity. Under field-relevant unsaturated conditions, amendment effectiveness may also depend on interactions between metal-specific retention behavior and soil hydraulic variability. Further studies integrating structural characterization, long-term aging, and reactive transport modeling are required to validate these processes under heterogeneous field conditions.
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Environmental Technology & Innovation
·
2024
·
IF 6.7
Gaoxiang Zhang,Wencong Wu,Feiyu Huang,Ming Yuan,Fang Liu,Hao Zhou,Liansheng He
A novel polyfunctional group-modified poly(hydroxyethyl methacrylate) polymer, termed PFG-PHEMA, was synthesized for adsorption of Cu 2+ and Cd 2+ . Material characterization confirmed that the surface functional groups facilitated efficient adsorption of these ions. pH optimization experiments demonstrated that the adsorption capacities of Cu 2+ and Cd 2+ , reaching 162.2 and 150.3 mg·L −1 respectively, were maximized at a pH of 5, with an initial heavy metal concentration of 200 mg·L −1 . Kinetic and isotherm studies indicated that the adsorption process conformed to a monolayer, homogeneous, and chemisorption model, achieving equilibrium within 60 min. The maximum adsorption capacities were determined to be 500 mg·g −1 for Cu 2+ and 384.6 mg·g −1 for Cd 2+ . Competitive adsorption experiments showed that PFG-PHEMA exhibited superior selectivity for Cu 2+ over other metal ions. This selectivity was corroborated by X-ray photoelectron spectroscopy (XPS) analysis, which identified the sulfhydryl group as the crucial functional moiety responsible for Cu 2+ selectivity. Furthermore, the presence of low concentrations of fulvic acid (FA) enhanced adsorption via ternary complex formation, whereas higher concentrations impeded adsorption by forming FA-metal complexes that competed with the polymer. Overall, the strategic incorporation of multiple functional groups into PFG-PHEMA conferred a high adsorption capacity for Cu 2+ and Cd 2+ . The analysis further indicated that sulfhydryl groups exhibit high selectivity toward Cu 2+ , whereas amine and oxygen-containing groups preferentially bind to Cd 2+ , reinforcing the potential of PFG-PHEMA as a highly effective adsorbent for heavy metals.
研究领域:
环境科学
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材料科学
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Sijia Xu,Fengchao Wang,Jinfang Kong,Canyun Zhang,Lan Li,Jin Chen,Jing Yang,Yu Sun
High Mn 2+ doping concentration can lead to the formation of high-density defects/trap states, which serve as non-radiative recombination centers, seriously restricting the energy transfer efficiency from the host nanocrystals to Mn 2+ . Herein, we introduce Cd 2+ into Mn 2+ -doped CsPb(BrCl) 3 nanocrystalline (NCs) film to effectively suppress non-radiative recombination. The analysis of the structure and composition confirmed the phase and chemical composition of the Cd 2+ -Mn 2+ co-doped CsPb(BrCl) 3 NCs film. Steady-state and time-resolved photoluminescence (PL) spectra revealed the enhanced optical properties of the co-doped CsPb(BrCl) 3 NCs film. The Mn 2+ emission peak is studied in the temperature range of 80 K–300 K. Strong electron-phonon coupling causes an anomalous blueshift and linewidth broadening of the Mn 2+ emission peak with increasing temperature. Temperature-dependent PL spectra confirmed that the energy transfer between the exciton emission peak and the Mn 2+ emission peak was regulated through Cd 2+ doping, achieving the negative thermal quenching effect. This study utilized C 9 H 23 NO 3 Si (APTES) for the surface encapsulation of the NCs film to enhance their stability. Substituting Pb 2+ with Cd 2+ and Mn 2+ enhances the stability of the nanocrystals and alleviates lattice distortion within the [PbCl 6 ] 4- octahedral framework. The experimental results indicate that the Mn 2+ emission peak of the co-doped CsPb(BrCl) 3 NCs film retains 80.7% of its luminescent intensity after 31 days of storage in air, thereby confirming its excellent optical stability.
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NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Mansoor Ahmad,Neha,Yijing Ai,Naseer Ahmad,Behisht Ara,Wei Sun
Monitoring of heavy metals in the environment is critical to reduce health risks. The establishment of a simple and effective electrochemical sensor with high sensitivity and a wide linear range is required for the determination of heavy metal ions. This study reports a new nanocomposite of MAX-phase Ti3AlC2 and graphene oxide (GO) for the electrochemical sensing of cadmium and copper ions. The nanocomposite was synthesized by a modified mixture method and characterized using various physicochemical characterization techniques. XRD patterns confirmed a highly crystalline, phase-pure structure, and SEM analysis revealed the rough and porous surface morphology of the Ti3AlC2@GO nanocomposite. The elemental composition and XPS spectra of the nanocomposite confirmed the successful integration of MAX-phase Ti3AlC2 with GO. The nanocomposite was modified onto a glassy carbon electrode (GCE) using a simple drop-casting procedure. The electrochemical activity of the Ti3AlC2@GO/GCE was analyzed by cyclic voltammetry with differential pulse anodic stripping voltammetry (DPASV) for metal ion analysis. The results indicated that the presence of the Ti3AlC2@GO nanocomposite on the GCE enhanced the sensitivity and selectivity for Cd2+ and Cu2+ analysis. The sensor demonstrated a wide linear range from 0.1 to 100.0 µM with low detection limits of 0.055 µM for Cd2+ and 0.059 µM for Cu2+. The Ti3AlC2@GO/GCE showed excellent stability, sensitivity, selectivity, and reproducibility, making it a promising platform for the reliable electrochemical detection of Cd2+ and Cu2+ in environmental monitoring applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
·
IF 2.88
Qingming Wang,Yingzi Tan,Nianhua Wang,Zhixiang Lu,Wenling Wang
A fluorescence probe based on thiosemicarbazide has been synthesized and well characterized by 1 H NMR, 13 C NMR, Elemental analysis , Electrospray ionization mass spectra . The probe 1 functions as a multitarget ion sensor, detect biologically and ecologically important Cd 2+ , PO 4 3− and Cr 3+ . Meanwhile, probe 1 displays selectivity for Cd 2+ over other metal ions and anions in DMF by emission spectrum. Interestingly, probe 1 has been explored to recognize PO 4 3− in CH 3 OH-H 2 O ( v : v = 1:9). The binding stoichiometry of probe 1 with Cd 2+ and PO 4 3− are 2:1 and 1:1, respectively, which are confirmed by Electrospray ionization mass spectra. Probe 1 is selective, sensitive and reversibility/reusability to Cd 2+ and PO 4 3− with the detection limit as low as 0.035 μM and 0.011 μM respectively. Besides, the designed probe 1 has shown potential applications in the area of photo-printing.
研究领域:
分析化学
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环境科学
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生物化学
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PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
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2019
·
IF 1.901
Hui Li,Lunchao Duan,Hong Wang,Yajun Chen,Fenghe Wang,Shengtian Zhang
The photolytic behaviour of sulfadiazine (SD) under ultraviolet (UV) radiation was investigated. The results showed that the SD photolysis fitted quasi-first-order kinetics model. The acid condition is favourable to the UV photolysis of SD because of more free radicals compared to the neutral and cationic conditions. NO 3− inhibited the SD photolysis, which may be resulted from the competition of NO 3− with SD for UV. Conversely, Cd 2+ could promote the SD photolysis, because the metal ions reduce the reaction activation energy of the rate determining step. This research could serve as reference for SD photolysis contained in wastewater under UV radiation.
研究领域:
环境科学
·
药学
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
·
IF 2.88
Juan Han,Xu Tang,Yun Wang,Renjie Liu,Lei Wang,Liang Ni
A novel fluorescent probe based 8-hydroxyquinoline (8-HQ) has been designed and synthesized. The probe 1 exhibits fast relay recognition performance for Cu 2+ and Cd 2+ via a fluorescence “on−off−on” response signal. The probe 1 itself has a strong emission peak at 471 nm in EtOH/H 2 O (v/v = 1:9) solution with a blue fluorescence. The addition of Cu 2+ immediately results in the quenching of fluorescence and the limit of detection is 2.7 × 10 −8 M. Moreover, the formation of [1-Cu 2+ ] complexes can also serve as a new efficient probe system for the relay recognition of Cd 2+ with the emergence of a new fluorescence signal under the same conditions. The study also found that the probe 1 has high selectivity for target ions in the presence of other competing ions. The probe 1 has been successfully applied to detect and analyze the trace amount of Cu 2+ and Cd 2+ in environmental water samples.
研究领域:
分析化学
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环境科学
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PubMed
高影响因子
CHEMICAL PAPERS
·
2019
·Vol. 74
·期 2
·485-497
·
IF 1.246
Quan Cong,Liu Jiayu,Sun Wei,Cheng Xinjian
It is extremely necessary to detect heavy metals sensitively and selectively, especially the ions that will cause great harm to humans and the environment. This work deals with two fluorescent chemosensors and their outstanding role when detecting Zn 2+ and Cd 2+ ions. First, a small molecular chemosensor (TPB) has been designed and synthesized via Suzuki reaction using one part of benzene-1,3,5-triyltriboronic acid and three parts of 2-bromo-1, 10-phenanthroline as starting materials. And then, its corresponding macromolecular fluorescent chemosensor (PTPB) was synthesized. The infrared spectra, mass spectrometry (MS), and 1 H-NMR were used to study the structures of TPB and PTPB. From what has been studied, the TPB and PTPB were stable in a relative wide pH range. As soon as the Cd 2+ and Zn 2+ ions added, fluorescence of the two sensors TPB and PTPB was changed obviously. In addition, PTPB was found have better performance to both Cd 2+ and Zn 2+ than TPB through the ‘‘molecular wire’’ mechanism. Job’s plots were also be tested, showing that the combination ratio of TPB and PTPB to Cd 2+ and Zn 2+ were both 3:1 (ion/sensor). In addition, the minimum detection limits of the macromolecular chemosensor PTPB for Cd 2+ and Zn 2+ reached 0.424 μM and 1.27 μM, respectively.
研究领域:
分析化学
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环境科学
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
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IF 3.012
Shuo Duan,Yuming Huang
A novel electrochemical sensor was developed for the sensitive and selective detection of Cu 2 + , Pb 2 + and Cd 2 + , which was based on NH 2 -MIL-88(Fe)-rGO composite modified glass carbon electrode (NH 2 -MIL-88(Fe)-rGO/GCE). The NH 2 -MIL-88(Fe)-rGO composite was facilely prepared by a one-step method and characterized by SEM, XRD, Raman spectrum and electrochemical methods. The stepwise GCE modified process was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The electrochemical behaviors of Cu 2 + , Pb 2 + and Cd 2 + ions on the NH 2 -MIL-88(Fe)-rGO/GCE were explored by differential pulse anodic stripping voltammetry (DPASV). It was found that NH 2 -MIL-88(Fe)-rGO was capable of adsorbing Cu 2 + , Pb 2 + and Cd 2 + ions from aqueous solutions and the NH 2 -MIL-88(Fe)-rGO/GCE could enhance the electrochemical responses of Cu 2 + , Pb 2 + and Cd 2 + effectively. Important operational parameters such as electrolyte pH and deposition time were investigated and optimized for the determination of trace Cu 2 + , Pb 2 + and Cd 2 + ions. Under the optimum conditions, the proposed electrochemical sensor had a linear range of 0.005––0.3 μM for Cd 2 + , 0.01–0.3 μM for Pb 2 + and 0.005–0.05 μM for Cu 2 + , respectively. The limits of detection (LODs) are 4.9 nM for Cd 2 + , 10 nM for Pb 2 + and 3.6 nM for Cu 2 + , respectively. The proposed method has been successfully applied to determine three metal ions in water samples. The developed sensor promises simple preparation, fast operation, good sensitivity and excellent reusability, showing great potential for monitoring of water quality.
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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Catalysts
·
2022
·Vol. 12
·期 12
·1653
·
IF 4.501
Jiameng Zhang,Zhiliang Yu,Yaling Gao,Meini Wang,Kai Wang,Tao Pan
A newly isolated cadmium (Cd)-resistant bacterial strain from herbicides-polluted soil in China could use atrazine as the sole carbon, nitrogen, and energy source for growth in a mineral salt medium (MSM). Based on 16S rRNA gene sequence analysis and physiochemical tests, the bacterium was identified asArthrobactersp. and named ST11. The biodegradation of atrazine by ST11 was investigated in experiments, with the compound present either as crystals or dissolved in di(2-ethylhexyl) phthalate (DEHP) as a non-aqueous phase liquid (NAPL). After 48 h, ST11 consumed 68% of the crystalline atrazine in MSM. After being dissolved in DEHP, the degradation ratio of atrazine was reduced to 55% under the same conditions. Obviously, the NAPL-dissolved atrazine has lower bioavailability than the crystalline atrazine. Cd2+at concentrations of 0.05–1.5 mmol/L either had no effect (<0.3 mmol/L), slight effects (0.5–1.0 mmol/L), or significantly (1.5 mmol/L) inhibited the growth of ST11 in Luria-Bertani medium. Correspondingly, in the whole concentration range (0.05–1.5 mmol/L), Cd2+promoted ST11 to degrade atrazine, whether crystalline or dissolved in DEHP. Refusal to adsorb Cd2+may be the main mechanism of high Cd resistance in ST11 cells. These results may provide valuable insights for the microbial treatment of arable soil co-polluted by atrazine and Cd.Keywords:atrazine;Arthrobactersp. ST11;biodegradation;nonaqueous-phase liquid;cadmium
研究领域:
环境科学
·
微生物学
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Zhao Song,Lingyu Li,Yidi Chen,Xiaoguang Duan,Nanqi Ren
Biochars are low-cost and sustainable materials for environmental technologies. In this work, we prepared three biochars using pomelo peel (P-BC), algae (A-BC), and corncob (C-BC) to recover Cd 2+ from wastewater via capacitive deionisation (CDI). A-BC possesses the highest amount of mesopores and nitrogen functionality and attains the highest removal of Cd 2+ via physical adsorption. For the electro-sorption capacity, C-BC and A-BC perform better capacitive removal of Cd 2+ than P-BC due to the smaller charge-transfer and mass-transfer resistances. Also, this work investigated the impacts of surface morphology , cell voltage, NaCl, initial pH, and Cd 2+ concentrations on Cd 2+ capacitive removal and electrode regeneration performances. The results indicated that A-BC and C-BC may be prospective materials for Cd 2+ removal from wastewater by CDI. However, the presence of competing cations at high concentrations may influence the removal of Cd 2+ at a low level, requiring the modification of A-BC and C-BC in future work.
研究领域:
环境科学
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材料科学
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Ya Li,Chao-Yu Wang,Dong-Jin Qian
Molecular arrangement and orientation of tetraphenylethylene (TPE) unit in the highly ordered thin films and aggregates can effectively limit its conformation that results in strong effect on the excited energy transfer process and luminescent behaviors under irradiation. We report here an interfacial self-assembly of metal-TPE coordination polymer (CP) ultrathin films and their aggregate-induced emission (AIE) behaviors. After connected with pyridyl or benzimidazole substituents, the tetradentate TPEs as synthesized are used as the multidentate linkers to coordinate with the Cd 2+ ions to produce aggregates in the solutions, and to form well-defined two- and three-dimensional organized Cd-TPE CP multilayers at the air-water interfaces by the Langmuir-Blodgett (LB) method. It is revealed that, in addition to the aggregation-induced emission, the following external factors have also large effects on the luminescence of TPEs , including the coordination bonding in the CPs, in plane and interlayer molecular interaction in the LB films ; both of them can restrict the intramolecular motion or rotation of TPE unit. Because of these external effects, the emission lifetime of TPEs reaches to approximately 5–10 times longer in some Cd-TPE CP LB films than that in the solutions. Further, the luminescent emission wavelengths and colors of LB films can be tuned to some extent by the in-plane and interlayer molecular interaction. Finally, it is demonstrated that the luminescent emissions and colors of the Cd-TPPE CP LB films is selectively sensing to methanol and formic acid in the gas phase with good reversibility and reproductivity.
研究领域:
材料化学
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光物理学
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高影响因子
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